511.

Which is correct regarding size of atom?

• N < O

• B < Ne

• V > Ti

• Na > K

Which of the following is not sp² hybridised?

• Graphite

• Graphene

• Fullerene

• Dry ice

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

• Ti²⁺,3.87 B.M.

• Cr²⁺, 4.90 B.M.

• Co³⁺,3.87 B.M.

• Mn²⁺,4.90 B.M.

In O₃ molecule, the formal charge on the central O-atom is

• 0

• -1

• -2

• +1

Which of the following represents the correct bond order?

• $O_2^{+}<O_2^{-}>O_2^{2-}$

• $O_2^{-}>O_2^{2-}>O_2^{+}$

• $O_2^{2-}>O_2^{+}>O_2^{-}$

• $O_2^{+}>O_2^{-}>O_2^{2-}$

What is the oxidation number of Br in KBrO₄ ?

• + 6

• + 7

• + 5

• + 8

Which ofthe following statements is incorrect?

• Li⁺ has minimum degree of hydration.

• The oxidation state of K in KO₂ is + 1.

• Na is used to make a Na/Pb alloy.

• MgSO₄ is readily soluble in water.

Assertion: Co(IV) is known but Ni(IV) is not.             

Reason: Ni(IV) has d4 electronic configuration.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason: The bond length of N₂ is shorter than that of oxygen.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : O₂ has higher bond length than O₃.

Reason: O₃ is paramagnetic.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.