Assertion : $S{F}_6$ is used as a gaseous insulator in high voltage generators.

Reason :  It is inert and has good dielectric properties.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Assertion : Finely divided iron does not form ferric chloride with hydrochloric acid.

Reason :  Hydrochloric acid produces hydrogen gas with iron.

Assertion : $Xe{F}_6$ reacts with small quantity of water to form $XeO{F}_4$.

Reason : $Xe{F}_6$ reacts with glass and form $XeO{F}_4$.

Which one of the following does not exist?

1. XeOF₄

2. NeF₂

3. XeF₂

4. XeF₆ 

The hybridisation of atomic orbitals of nitrogen in $N{O}_2^{+},N{O}_3^{-}<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>N{H}_4^{+}$ are 

(A) sp, sp³ and sp² respectively

(B) sp, sp² and sp³ respectively

(C) sp², sp and sp³ respectively

(D) sp², sp³ and sp respectively

Which of the following hydrides is most acidic

(1) H₂Te

(2) H₂Se

(3) H₂O

(4) H₂S

Which of the following statements about H₂SO₄ is false:

1. It can act as an oxidising agent with copper

2. It acts as a dehydrating agent with sugar

3. It acts as an acid in its reaction with BaO₂

4. It acts as a reducing agent in its reaction with Cu₂O

Which of the following oxide is most acidic

(1) Na₂O

(2) Al₂O₃

(3) P₂O₅

(4) SO₃

The least acidic oxide among the following is:

1. P₄O₆ 

2. P₄O₁₀ 

3. As₄O₆ 

4. As₄O₁₀ 

Which of the following polyhalide ion is most stable

1. $B{r}_3^{-}$ 

2. $I_3^{-}$ 

3. $C{l}_3^{-}$ 

4. $F_3^{-}$