Assertion : Most of the known noble gas compounds are those of xenon.

Reason : The ionisation enthalpy of xenon is very close to that of oxygen.

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 : ClF₃ exists but FCl₃ does not.

Reason :  FCl₃ is not formed due to the inability of F to expand its coordination number due to the absence of a vacant d subshell.

Assertion: Among hydrides of the elements of group 16, water shows unusual physical properties.

Reason: Water shows unusual physical properties due to hydrogen bonding between the water molecules.

Assertion : Fluorine is a stronger oxidizing agent than chlorine.

Reason : Fluorine can displace chlorine from chlorides.

Assertion :  In trimethyalamine (N(CH₃)₃), the nitrogen has a pyramidal geometry, wheres in trisilylamine (N(SiH₃)₃), it has a planer geometry.

Reason : In trimethylamine, nitrogen shows sp³ hybridization while in trisilyamine it shows sp² hybridization.

In the nitrogen family, the H-M-H bond angle in the hybrides MH₃ gradually becomes closer to 90^o if we move from N to Sb. This shows that gradually  

The shape and the type of hybridization (of the Cl-atom) in  the CIF₃ molecule

1.		2.
3.		4.

A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has triangular pyramidal structure X and Y are

(1) SF₄ and S₂F₂

(2)  SF₆ and  SF₄ 

(3) NaF and NaCl

(4)  SF₄ and SF₆ 

Oxide of a non-metal possesses the following characterstics.

(i) It is both a proton donor and proton acceptor

(ii) It is poor conductor of electricity

(iii) It reacts readily with basic and acidic oxides

(iv) It oxidises Fe at boiling point.

The oxide is

(1) H₂O

(2) CO₂

(3) H₂O₂

(4) NO

Strong oxidising agent and strong reducing agents are respectively

(1) F₂, HI

(2) Cl₂, HCl

(3) Br₂,HBr

(4) I₂, HF