S- Block JEE mains PYQ

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Question 1

Match List-I with List-II.

List-I (Alkali Metal)	List-II (Emission Wavelength in nm)
A. Li	(iii) 670.8
B. Na	(i) 589.2
C. Rb	(iv) 780.0
D. Cs	(ii) 455.5

Question 2

Given below are two statements:

Assertion (A): Loss of electron from hydrogen atom results in nucleus of ~1.5 × 10⁻³ pm size.

Reason (R): Proton (H⁺) always exists in combined form.

Choose the most appropriate answer:

Both A and R are correct, and R is the correct explanation of A.
Both A and R are correct, but R is NOT the correct explanation of A.
A is correct, but R is incorrect.
A is incorrect, but R is correct.

Question 3

The setting time of cement is increased by adding:

A. Clay
B. Gypsum
C. Limestone
D. Silica

Question 4

Match Column I with Column II:

Column I (Elements)	Column II (Colour imparted to the flame)
A. K	II. Violet
B. Ca	I. Brick Red
C. Sr	IV. Crimson Red
D. Ba	III. Apple Green

Question 5

Compound A reacts with NH₄Cl and forms a compound B. Compound B reacts with H₂O and excess CO₂ to form compound C, which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B, and C are respectively:

Instructions for Students

1. Attempt all the questions before checking the answers.

2. Use the "Check Answer" button only after solving each question to assess your understanding.

3. Revisit the concepts for any question you find challenging.

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