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Mole Concept — JEE main PYQ series studyBeacon


Mole Concept — Interactive Quiz (25 Qs)

  

Instructions
  • MCQs — choose one radio option.
  • Numerical questions — type the numeric answer (no units). Use dot for decimals. ±1% accepted.
  • Click "Check" for a question to reveal the solution for that question.
  • Use "Check All & Score" to evaluate the whole quiz.
1. The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' × 1012 Hz and that has a radiant intensity in that direction of 1/'B' watt per steradian. 'A' and 'B' are respectively. [09 April 2024 — Shift-II]
2. Which of the following have same number of significant figures?
(A) 0.00253   (B) 1.0003   (C) 15.0   (D) 163 [08 April 2023 — Shift-II]
3. Using rules of significant figures evaluate: (0.02858 × 0.112) ÷ 0.5702. [29 June 2022 — Shift-II]
4. The number of significant figures in 0.00340 is ________. [25 July 2021 — Shift-II]
5. The number of significant figures in 50000.020 × 10-3 is ______. [26 Feb 2021 — Shift-I]
6. Choose the incorrect statement about Dalton’s Atomic Theory. [04 April 2024 — Shift-II]
7. The incorrect postulates of Dalton's atomic theory are: (A) Atoms of different elements differ in mass. (B) Matter consists of divisible atoms. (C) Compounds are formed when atoms of different element combine in a fixed ratio. (D) All the atoms of given element have different properties including mass. (E) Chemical reactions involve reorganisation of atoms. Which set is incorrect? [05 April 2024 — Shift-I]
8. The average molar mass of chlorine is 35.5 g mol-1. The ratio of ³⁵Cl to ³⁷Cl in naturally occurring chlorine is close to: [06 Sept 2020 — Shift-II]
9. A 0.05 cm thick coating of silver is deposited on a plate of 0.05 m2 area. The number of silver atoms deposited on plate are ______ × 1023. (Ag = 108 g mol-1, density = 7.9 g cm-3) [30 Jan 2024 — Shift-I]
10. The number of molecules and moles in 2.8375 L of O2 at STP are respectively: [10 April 2023 — Shift-I]
11. Match List-I with List-II. [10 April 2023 — Shift-II]
A. 16 g CH4 (g)   B. 1 g H2 (g)   C. 1 mole of N2 (g)   D. 0.5 mol of SO2 (g)
I. Weighs 28 g   II. 60.2 × 1023 electrons   III. Weighs 32 g   IV. Occupies 11.4 L at STP
12. When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO2 was produced. The molar mass of compound is ______ g mol-1 (nearest integer). [29 Jan 2023 — Shift-II]
13. Fe3O4(s) + 4CO(g) → 3Fe(l) + 4CO2(g). If 4.640 kg of Fe3O4 and 2.520 kg of CO react, the amount of Fe produced (g) is: (Fe=56, O=16, C=12) [29 June 2022 — Shift-I]
14. SO2Cl2 + 2H2O → H2SO4 + 2HCl. If 16 mol NaOH are required to neutralize the acidic mixture, number of moles of SO2Cl2 used is: [25 July 2022 — Shift-I]
15. Hemoglobin contains 0.34% Fe by mass. Number of Fe atoms in 3.3 g hemoglobin? (Fe=56 u, NA=6.022×1023) [26 July 2022 — Shift-II]
16. A 250 g solution of D-glucose contains 10.8% carbon by weight. The molality of the solution is nearest to: [27 July 2022 — Shift-I]
17. Number of N atoms in 681 g of C7H5N3O6 is x × 1021. Find x (nearest integer). [25 June 2022 — Shift-I]
18. A protein ‘A’ contains 0.30% glycine (MW 75). The minimum molar mass of protein A is ______ × 103 g mol-1 (nearest integer). [25 June 2022 — Shift-II]
19. Assuming CNG ≈ CH4, when 100 g CH4 is mixed with 208 g O2 and combusted, how many grams of CO2 form? (nearest integer). [26 June 2022 — Shift-II]
20. 56.0 L N2 is mixed with excess H2 and 20 L NH3 is produced. Volume of unused N2 (L)? [25 July 2022 — Shift-II]
21. Chlorophyll extracted: 2 L solution at 48 ppm Mg. Number of Mg atoms = x × 1020; find x (nearest integer). (Mg = 24 g mol-1, NA=6.02×1023) [26 July 2022 — Shift-I]
22. 1 L solution of H2SO4 contains 0.02 m mol (0.02 mmol). 50% of this solution is diluted to 1 L (solution A). In A, 0.01 m mol H2SO4 are added. Total m moles of H2SO4 in final solution is ______ × 103 m moles. (Use integer format as in original) [25 June 2022 — Shift-I]
23. Two elements A and B form 0.15 mol of A2B and AB3. If both weigh equally, atomic weight of A is ______ times that of B. [27 June 2022 — Shift-I]
24. Grams of bromine (Br2) that react with 5.0 g pent-1-ene = ______ × 10-2 g. (Br = 80) (nearest integer). [25 June 2022 — Shift-I]
25. Moles of methane required to produce 81 g water after complete combustion = ______ × 10-2 mol (nearest integer). [26 June 2022 — Shift-II]


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