Which of the following forms molecular solid?

• SO₂

• SiO₂

• SiC

• Diamond

Conc. H₂SO₄ displaces hydrogen chloride from chlorides because:

• it is stronger acid

• sulphates are less soluble than chlorides

• sulphates are more soluble than chlorides

• HCl is a gas while H₂SO₄ is a liquid

Liquid flow from a higher to a lower level.Which of the following liquids can climb up the walls of the glass vessel in which it is placed?

• Mercury

• Liquid N₂

• Liquid He (II)

• Water

A greenish yellow gas reacts with alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate respectively are :

• B₂ , KBrO₃

• Cl₂ , KClO₃

• I₂ , NaIO₃

• Cl₂ , NaClO₃

When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen. The inorganic nitrogen is in the form of :

• ammonia

• elements of nitrogen

• nitrates

• nitrides

The function of Fe(OH)₃ in the contact process is :

• to remove arsenic impurity

• to detect colloidal impurity

• to detect colloidal impurity

• to remove dust particles

1197.

Assertion : Hydrides of group-16 elements show volatility in the order :

H₂O > H₂S > H₂Se > H₂Te

Reason : Electronegativity of group-16 elements increases down the group from oxygen to tellurium

• 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 : Equivalent weight of NH, in the reaction, N, $\to$ NH₃ is 17/3 while that of N₂ is 28/6.

Reason : Equivalent weight = $\frac{\mathrm{Molecular} \mathrm{weight}}{\mathrm{Number} \mathrm{of} {\mathrm{e}}^{-} \mathrm{lost} \mathrm{or} \mathrm{gained} \mathrm{per} \mathrm{mole}}$

• 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

Chlorine oxidises sodium thiosulphate to form

• Na₂SO₃

• Na₂O

• Na₂SO₄

• Na₂CO₃

Which can dissolve I₂ ?

• KI

• NaI

• LiI

• HI