The critical temperature of water is higher than that of O2 because H2O molecule has:

(a) fewer electrons than oxygen

(b) two covalent bonds

(c) V-shape

(d) dipole moment

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Density of water is maximum at:

(a) 0$°$C

(b) 100 $°$C

(c) 4$°$C

(d) 0 K

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Metal which does not react with cold water but evolves H2 with steam is:

(a) Na

(b) K

(c) Pt

(d) Fe

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An ionic compound is dissolved simultaneously in heavy water and ordinary water, its solubility is –

(A) Larger in heavy water

(B) Smaller in heavy water

(C) Solubility is same in both waters

(D) Smaller in simple water

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${\mathrm{H}}_{2}\mathrm{O}$ has higher boiling point than ${\mathrm{H}}_{2}\mathrm{S}$ because.

(A) ${\mathrm{H}}_{2}\mathrm{O}$ is a smaller molecule and hence more closely packed

(B) The bond angle in ${\mathrm{H}}_{2}\mathrm{O}$ is more than in ${\mathrm{H}}_{2}\mathrm{S}$ and hence the former molecules are more tightly packed

(C) Of intermolecular hydrogen bonding in liquid ${\mathrm{H}}_{2}\mathrm{O}$

(D) The latent heat of vaporisation is higher for ${\mathrm{H}}_{2}\mathrm{O}$ than for ${\mathrm{H}}_{2}\mathrm{S}$

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The maximum possible number of hydrogen bonds a water molecule can form is –

(A) 2

(B) 4

(C) 3

(D) 1

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Assertion:  ${\mathrm{D}}_{2}\mathrm{O}$ is called heavy water.

Reason : Its degree of dissociation is high.

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