Assertion : $HN{O}_3$ oxides sulphur to $H_{2}S{O}_4$  acid ( S + VI) but only oxidizes selenium to $H_{2}Se{O}_3$ ( Se + IV ).

Reason : In Selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

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 : Sulphur dioxide is more powerful reducing agent in alkaline medium than in acidic
medium.

Reason :  Sulphur dioxide reacts with hydrogen sulphide in presence of moisture and sulphur is
precipitated.

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

Reason :  It is inert and has good dielectric properties.

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 $N{O}_2^{+},N{O}_3^{-} and N{H}_4^{+}$ 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