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In this post, we will discuss the IUPAC nomenclature of elements with specific electronic configurations. Understanding this topic is crucial for chemistry students preparing for competitive exams like JEE Mains. Let's dive into the question and explore the solution step-by-step. Q. The IUPAC nomenclature of an element with electronic configuration [Rn]5f¹⁴6d¹7s² is: (JEE Mains 2022) A. Unnilbium B. Unnilunium C. Unnilquadium D. Unniltrium Show Answer Answer: (D) Unniltrium Explanation: The atomic number of the element is calculated as 103 (86 from [Rn] + 14 from 5f¹⁴ + 2 from 7s²). Based on the IUPAC rules, the element with atomic number 103 is named 'Unniltrium'. For more details on how to determine the IUPAC nomenclature of elements, refer to our Periodic Table Guide . Related Questions Understanding Electronic Configurations Basics of IUPAC Nomenclature Periodic Table

Question: Among the following, basic oxide is:   \(SO_3\)  \(SiO_2\)  CaO  \(Al_2\) \(O_3\) Show Answer Answer:(c) Acidic => \(SiO_2\).\(SO_3\) Amphoteric=> \(Al_2\)\(O_3\) Basic=> CaO     Organic chemistry .                 Inorganic chemistry

Question: The metal that has very low melting point and its periodic position is closer to metalloid is: (A) Al (B) Ga (C) Se (D) In Show Answer Answer:(b) Ga have low M.P and it is closer to metalloid in periodic table.     Organic chemistry .                 Inorganic chemistry

 Q. The effect of lanthanoid contraction in the lanthanoid series of elements by the large means                                                         ( jee 2019) A. Increase in both atomic and ionic radii B. Decrease in atomic radii and increase in ionic radii C. Decrease in both atomic and ionic radii  D. Increase in atomic radii and decrease in ionic radi Show Answer Ans:- (c) link pages

 Q. Which of the following atom has the highest first ionization energy?                                                            ( JEE  2016) A. Rb B. Na C. K D. Sc Show Answer Ans:- (D) Sc has highest first ionization energy because: Sc: [Ar]4s²3d¹ Poor screening of d-orbitals  link pages

 Q. Four particles each of mass 1 kg are placed at four corners of a square of side 2 m. Moment of inertia of system about an axis perpendicular to its plane and passing through one of its vertex is ______ kgm2.                                                         ( JEE mains 2024) Show Answer Moment of Inertia of the System The moment of inertia (I) of four particles, each of mass 1 kg, placed at the four corners of a square of side 2 m, about an axis perpendicular to its plane and passing through one of its vertices is given by: \[ I = 16 \, \text{kg} \cdot \text{m}^2 \]

 Q. An alternating voltage v(t) = 220 sin 100tr volt is applied to a purely resistive load of 50 2. The time taken for the current to rise from half of the peak value to the peak value is                                                            ( JEE mains 2029) A. 2.2 ms B. 5 ms C. 3.3 ms 4.7.2 ms Show Answer Ans:- (C) Phase Analysis Answer cos θ = (V 0 / 2) / V 0 = 1/2 ∴ θ = π / 3 Time taken for phase change by π / 3 is t 1 = θ / ω = (π / 3) / 100π = 1/300 = 3.33 ms More Questions

 Q.Α10 Ω resistance is connected across 220 V - 50 Hz AC supply. The time taken by the current to change from its maximum value to the rms value is:                                                           ( JEE mains 2021) A. 2.5 ms B. 4.5 ms C. 3.3 ms D. 7.2 msl Show Answer (a) \(I = I_0 \cos \omega t\) Since the current is changing from its maximum value to RMS value, therefore, \(I = I_0 / \sqrt{2}\) \(\therefore \frac{I_0}{\sqrt{2}} = I_0 \cos \omega t\) \(\cos \omega t = \frac{1}{\sqrt{2}}\) \(\cos(2\pi ft) = \cos \frac{\pi}{4} \implies 2\pi \times 50t = \frac{\pi}{4}\) \(t = 2.5 \, \text{ms}\) More Questions

Question: In comparison to boron, beryllium has: (A) Lesser nuclear charge and greater first ionisation.enthalpy (B) Lesser nuclear charge and lesser first ionisation.enthalpy (C) Greater nuclear charge and greater first ionisation.enthalpy (D) Greater nuclear charge and lesser first ionisation.enthalpy Show Answer Answer:(A) In case of "Be" electron remove from "2s" orbital while in case of "B" electron remove from "2p" orbital. '2s' orbital have greater peretration effect then '2p' orbitals. So, 'Be' have more I.E. than 'B'.

Question: Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason(R) Assertion (A): Molar mass of hydrated  oxalic acid dissolved in water to make 250.0 ml solution will result in 0.1 M oxalic acid solution. Reason(R): Molar mass of  hydrated oxalic acid is 126  g/mol In the light of the above statements . Choose the correct answer from the options given below: (A) Both (A) and (R) are True but (R) is not the correct explanation of (A) (B) (A) is false but (R) is True.  (C) (A) is True but (R) is false (D) Both (A) and (R) are True and (R) is  the correct explanation of (A) Show Answer Answer: Ans:-D The hydrated oxalic acid is represented as: \[ \text{H}_2\text{C}_2\text{O}_4 \cdot 2\text{H}_2\text{O} \] To calculate the molarity (M): \[ M = \frac{W \times 1000}{M \times V} \] ...

 Q. A solid circular disc of mass 50kg rolls along a horizontal floor so that its center of mass has a speed of 0.4 m/s. The absolute value of work done on the disc to stop it is _______ J.                                                         (jee mains 2024) Show Answer Ans:-  (6) Here, we will use the Work-Energy Theorem: \[ W = \Delta KE = 0 - \left( \frac{1}{2} mv^2 + \frac{1}{2} I \omega^2 \right) \] Simplifying, \[ W = - \left( \frac{1}{2} \times 50 \times 0.4^2 \times \left( 1 + \frac{1}{2} \right) \right) \] Absolute work = +6 J // // //

 Q. A(g)⇌ 2B(g) + C(g)  For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time t is 720 mm Hg at a constant temperature T and constant volume V. The fraction of A(g) decomposed under these conditions is x x 10-1. The value of x is                                                       ( JEE mains 2023) Show Answer

 Q. The number of chiral carbon(s) present in peptide, Ile-Arg-Pro, is......     (JEE mains 2020) Show Answer Ans:- (4)

 Q. Number of chiral centers in penicilline is–—                                                         (JEE mains 2020) Show Answer And:- (3.0) The 🌟 star marked atoms are chiral 

 Q. The total number of lone pairs of electrons in N₂O, is                                                         (JEE advance 2015) Show Answer Ans:- 8

 Q. In final product number of methylene group (-CH 2-)                                                             ( JEE advance 2022) Show Answer Ans:- (2)

 Q. The total number of chiral molecules formed from one molecule of P on complete ozonolysis  (O3, Zn/HO) is_______.                                                         ( JEE advance 2022 p-1)) More Questions Show Answer Ans;- (2)

Simple Quiz Physics Quiz 1. What is the speed of light in vacuum? 3 x 10 8 m/s 2 x 10 8 m/s 1.5 x 10 8 m/s 1 x 10 8 m/s 2. Which planet is known as the Red Planet? Earth Venus Mars Jupiter Submit

 Q. In metallurgy the term "gangue" is used for:                                                         ( JEE mains 2022 ) 1. Contamination of undesired earthy materials. 2. Contamination of metals, other than desired metal 3. Minerals which are naturally occuring in pure form 4.Magnetic impurities in an ore. Show Answer Ans:- [A] Earthy and undesired materials present in the ore, other then the desired metal, is known as gangue.

Q.The first ionization enthalpy of Na, Mg and Si, respectively, are: 496, 737 and 786 kJ mol¹. The first ionization enthalpy (kJ mol¹) of Al is:                                                         ( JEE mains 2022) 1. 487  2.  768 3. 577 4. 856 Show Answer Ans:- [c] I. E: Na < Al < Mg < Si  .. 496 <IE (Al) < 737  Option (C), matches the condition .  i.e IE (Al) = 577 kJmol-¹

 Q. The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:                                                         ( JEE mains 2022) 1. Zn(OH)2  2.  ZnO 3. [Zn(OH)4]²- 4.  [ZnO2]²– Show Answer Ans :- [D] Zinc dissolves in excess of aqueous alkali  Zn + 2OH + 2H2O→ [Zn(OH)4]² + H₂ ↑ Tetrahydroxozincate(II) ion  However, this reaction in NCERT is given as Zn+2NaOH → Na,ZnO, + H, ↑  ZnO² is anhydrous form of [Zn(OH)4] 2- So in aqueous medium best answer of this question is [Zn(OH)4]²-

 Q. In a linear simple harmonic motion (SHM) (A) Restoring force is directly proportional to the displacement.  (B) The acceleration and displacement are opposite in direction.  (C) The velocity is maximum at mean position. (D) The acceleration is minimum at extreme points.  Choose the correct answer from the options given below:                                                         (JEE mains 2023) 1. (A), (B) and (C) only   2. (C) and (D) only 3. (A), (B) and (D) only 4. (A), (C) and (D) only Show Answer Ans. (1)   F=-kx,          A true  a=-w²x.      B true  Velocity is maximum at mean position, C true  Acceleration is maximum at extreme point, D false

 Q. The height of transmitting antenna is 180 m and the height of the receiving antenna is 245 m. The maximum distance between them for satisfactory communication in line of sight will be :                                                         ( JEE mains 2023) 1. 48 km 2. 56 km 3. 96 km 4. 104 km Ans. (4)   dmax = √(2Rh, +2Rh) = √2x64×105×180+2×64×105×245  = {(8× 6 × 10³) + (8 × 7 × 10³)} m  = (48 +56) km  = 104 km

 Q. The half-life of a radioactive nucleus is 5 years, The fraction of the original sample that would decay in 15 years is :                                                         ( JEE mains 2023) 1. 1/8 2. 1/4 3. 7/8 4. 3/4 Show Answer Ans. (3)  15 year = 3 half lives  Number of active nuclei = N/8  Number of decay = 7/8N

 Q. (A flask contains Hydrogen and Argon in the ratio 2:1 by mass. The temperature of the mixture is 30°C. The ratio of average kinetic energy per molecule of the two gases (K argon/K hydrogen) is: (Given: Atomic Weight of Ar = 39.9)                                                         (JEE mains 2023) 1. 1  2. 2 3. 39.9/2  4. 39.9 Show Answer  Ans. (1)     Average KE per molecule = -3/2 kT   K1/k2 = 1/1

 Q. A 12 V battery connected to a coil of resistance 6 Ω through a switch, drives a constant current in the circuit. The switch is opened in 1 ms. The emf induced across the coil is 20 V. The inductance of the coil is:                                                         ( JEE mains 2023) 1. 5 mH  2. 12 mH 3. 8 mH 4. 10 mH Show Answer Ans. (D)  Induced emf = -L di/dt 20= -L(0-2)/10-³ L= 10 mH

 Q. The position of a particle related to time is given by x = (5t² - 4t + 5)m. The magnitude of velocity of the particle at t = 2s will be :                                                         ( JEE mains 2023) 1. 10 m/s 2. 14 m/s 3. 16 m/s 4. 06 m/s Show Answer Ans. (3)  x=5t²-4t+ 5  v = 10t-4  At t = 2s.  v = 16m/s

  Q. The position vector of a particle related to time t is given by r =(10ti+15t²j+7k)m The direction of net force experienced by the particle is :                                                         (JEE mains 2023) 1. Positive y-axis   2. Positive x-axis 3. Positive z-axis 4. In x-y plane Show Answer Ans:- 1

  Q. A block of mass 10 kg is moving along x-axis under the action of force F = 5x N. The work done by the force in moving the block from x = 2m to 4m will be__________ J.                                                         (JEE mains 2023) Show Answer Work done = ∫Fdx  ∫ 5x.dx = 5[x²/2] (limit 2=>4) =5/2[16-4] = 30 J.     Understand the Concept

 Q. The possibility of photochemical smog formation will be minimum at                                                         (Jee mains 2023) 1. Kolkata in October  2. Mumbai in May 3. New-Delhi in August (Summer) 4.Srinagar, Jammu and Kashmir in January Show Answer Ans:- (4) Sol. Photochemical smog occurs in warm, dry and sunny climate.

 Q. During water-gas shift reaction                                                         ( JEE mains 2023) 1. carbon monoxide is oxidized to carbon dioxide.  2. carbon is oxidized to carbon monoxide 3. carbon dioxide is reduced to carbon monoxide. 4.water is evaporated in presence of catalyst. Show Answer Ans:- (1)

 Q. For a good quality cement, the ratio of silica to alumina is found to be                                                         (JEE mains 2023) 1 . 3  2. 4.5 3. 2 4.1.5 Show Answer Ans:- (1) For good quality cement, the ratio of silica (SIO2) to Alumina (Al2O3) should be between 2.5 to 4.

 Q. Which of the following statement is correct for paper chromatography?                                                         (JEE mains 2023) 1. Water present in the mobile phase gets absorbed by the paper which then forms the stationary phase. 2. Water present in the pores of the paper forms the stationary phase.  3. Paper sheet forms the stationary phase. 4.Paper and water present in its pores together form the stationary phase. Show Answer Ans: (2) Sol. In paper chromatography, a special quality paper known as chromatography paper is used. Paper contains water trapped in it, which acts as the stationary phase.

 Q. The homoleptic and octahedral complex of Co2+ and H2O has ____unpaired electron(s) in the t2g set of orbitals.                                                          (JEE mains 2023) Show Answer Ans. (1)  Sol. Co2+: 3d configuration t²²¹ e¹¹

   Q. The volume (in mL) of 0.1 M AgNO3 required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2 as silver chloride is                                                     (jee2023) Show Answer And: 4

 Q. Given below are two statements: Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges. Statement II: Atoms of each element are stable and emit their characteristic spectrum. In the light of the above statements, choose the most appropriate answer from the options given below.                                                          (NEET-2024) 1. Both Statement I and Statement II are correct 2. Both Statement I and Statement II are incorrect 3. Statement I is correct but Statement II is incorrect 4. Statement I is incorrect but Statement II is correct Show Answer   Answer (3) Sol. Statement I is true as atoms are electrically neutral because they contain equal number of positive and negative charges. Statement II is wrong as atom of most of the elements are stable and emi...

 Q. A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A. The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as 4π × 10–⁷ SI units)                                                         (NEET-2024) 1. 44 mT (2)  (3)  (4)  2. 4.4 T 3. 4.4 mT 4.None of these  Show Answer.   

 Q. Two bodies A and B of same mass undergo completely inelastic one dimensional collision. The body A moves with velocity v1 while body B is at rest before collision. The velocity of the system after collision is v2. The ratio v1:v2 is                                                         (NEET-2024) 1. 1 : 2  2. 2 : 1 3. 4 : 1  4. 1 : 4 Show Answer Before collision  It undergoes completely inelastic collision Using conservation of linear momentum Initial momentum = Final momentum => mv1 = mv2 + mv2 => mv1 = 2mv2 V1/v2 = 2/1

 Q. If x=Sin(πt+π/3) represents the motion of a particle executing simple harmonic motion, the amplitude and time period of motion, respectively, are                                                         (NEET-2024) 1. 5 cm, 2 s 2. 5 m, 2 s 3. 5 cm, 1 s 4. 5 m, 1 s Show Answer Soln. X=sin(πt+π/3) amplitude=5m  ω=2π/T=π T= 2sec

    Chemistry PYQ  Q. The rate of hydrolysis of alkyl chloride improves because of better Nucleophilicity of I-. Order of Covalent bond;  A. KF > KI; LiF > KF  B. KF < KI; LiF > KF  C. SnCl4 > SnCl2; CuCl > NaCl  D. LiF > KF; CuCl < NaCl  E. KF <KI; CuCl > NaCl                                                         (jee mains 2024) 1. C, E only  2. B, C only 3. B, C, E only 4. A, B only Show Answer According to Fajan's Rule,  A. KF > KI - False; LiF > KF - True  B. KF <KI-True; LiF > KF - True  C. SnCl4 > SnCl2 - True; CuCl > NaCl - True  D. LiF > KF - True; CuCl < NaCl - False  E. KF <KI - True; CuCl > NaCl - True

  Chemistry PYQ  Q. Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution ?                                                         (jee mains 2023) 1.  (HPO3)n  2. H4P2O5 3. H4P2O6 4.H4P2O7 Show Answer Oxyacid having P-H bond can reduce AgNO3 to Ag .

  Chemistry PYQ  Q. Decreasing order of the hydrogen bonding in following forms of water is correctly represented by  A. Liquid water  B. Ice  C.Impure water                                                         (jee mains 2023) 1. A = B > C 2 . B > A > C 3. C > B > A 4.A > B > C Show Answer (2) Ice > Liquid water > Impure water  Due to impurity extent of H-Bonding decreases.

Chemistry PYQ   Q. Which of the following statements is not correct about rusting of iron?                                                         (jee mains 2023) 1. Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.  2. When pH lies above 9 or 10, rusting of iron does not take place.  3. Dissolved acidic oxides SO2, NO2 in water act as catalyst in the process of rusting. 4.Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object. Show Answer (1) - As tin coating is peeled off, then iron is exposed to atmosphere.

 Q. A block of mass 100 kg slides over a distance of 10 m on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4, then the work done against friction (in J) is:                                                         (jee mains 2024) 1. 4200  2. 3900 3. 4000  4. 4500 Show Answer (3)  Given m = 100 kg  s = 10 m  μ = 0.4  As f = µmg = 0.4×100×10= 400 N  Now Wfs=400×10=4000 J

 Q. All the letters of the word "GTWENTY" are written in all possible ways with or without meaning and these words are written as in a dictionary. The serial number of the word "GTWENTY" IS                                                         (jee mains 2024) Show Answer (553)  Words starting with E = 360  Words starting with GE = 60  Words starting with GN = 60  Words starting with GTE = 24  Words starting with GTN = 24  Words starting with GTT = 24  GTWENTY = 1  Total = 553 Physics                  Chemistry

 Q. An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 108 W/m² falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space = 3 × 108 m/s) :                                                         (jee mains 2024) 1. 36 Nm-² 2. 18 Nm-² 3. 6 Nm-² 4.  2 Nm-² Show Answer (3) -  Radiation pressure = I /V = Ιμ/C  =6×108×3/3×108  = 6 N/m²

 Q. A current of 200 µA deflects the coil of a moving coil galvanometer through 60°. The current to cause deflection through π/10 radian is:                                                          (JEE mains 2024) 1. 30 μΑ  2. 120 μΑ 3. 60 μΑ  4.  180 μΑ Show Answer (3)  i is directly proportional to θ i2/i1= θ2/θ1= 3/10  ⇒i2 = 60 μΑ

 Q. The atomic mass of (12C) is 12.000000 u and that of C13 is 13.003354 น. The required energy to remove a neutron from C¹³ , if mass of neutron is 1.008665 u, will be:                                                           (JEE mains 2024) 1. 62. 5 MeV  2. 6.25 MeV 3. 4.95 MeV  4.49.5 MeV Show Answer (4) 6C13+Energy----------> 6C12 1 +on  ∆m=(12.000000+ 1.008665) - 13.003354 =-0.00531 u ... Energy required = 0.00531 × 931.5 MeV = 4.95 MeV

 Q. Wheatstone bridge principle is used to measure the specific resistance (S1) of given wire, having length L, radius r. If X is the resistance of wire, 2 then specific resistance is: S₁ = X(πr²/ L) If the length of the wire gets doubled then the value of specific resistance will be:                                                        ( JEE mains 2024) 1.  S1/4 2. 2S1 3. S1/2  4.S1 Show Answer   (4) As specific resistance does not depends on dimension of wire so, it will not change.

 Q. Which structure of protein remains intact after coagulation of egg white on boiling?                                                         (JEE mains 2024) 1. Primary 2. Tertiary 3. Secondary 4.Quaternary Show Answer (1)  Boiling an egg causes denaturation of its protein resulting in loss of its quaternary, tertiary and secondary structures. Loading…