Mole Concept & Atomic Structure — NEET Chemistry practice

Question 1

Match the quantity in Column I with the number of moles in Column II. Column I: 88 g of CO₂; 6.022 × 10²³ molecules of H₂O; 5.6 L of O₂ at STP; 96 g of O₂ Column II: 0.25 mol; 2 mol; 1 mol; 3 mol

Accepted Answer

A→Q, B→R, C→P, D→S

Answer

A→S, B→R, C→Q, D→P

Answer

A→P, B→R, C→Q, D→S

Answer

A→R, B→S, C→P, D→Q

Question 2

The radial wave function ψ of an orbital starts negative near the nucleus, crosses zero once, rises to a positive maximum and then decays to zero. The number of nodal spheres (radial nodes) of this orbital is:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 3

A graph of probability density ψ² vs distance r is maximum at the nucleus, falls to zero, then shows a second hump before decaying. It represents:

Accepted Answer

2s

Answer

3s

Answer

1s

Answer

2p

Question 4

Read the Assertion and Reason carefully and choose the correct option. Assertion: Rutherford's nuclear model suggests that electrons and the nucleus are held together by gravitational forces. Reason: In the nuclear model, electrons orbit the nucleus much like planets orbit the sun, which are held by gravitational forces.

Accepted Answer

Assertion is false, but Reason is true.

Answer

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Answer

Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

Answer

Assertion is true, but Reason is false.

Question 5

Read Statement A and Statement B carefully and choose the correct option. Statement A: The energy of an electron in a Bohr orbit is inversely proportional to the square of the principal quantum number. Statement B: Electrons in higher-numbered orbits are more stable than those in lower-numbered orbits.

Accepted Answer

Statement A is true, but Statement B is false.

Answer

Both Statement A and Statement B are true.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Mole Concept & Atomic Structure: NEET practice questions

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