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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H2O has higher boiling point than H2S because.

(A) H2O is a smaller molecule and hence more closely packed

(B) The bond angle in H2O is more than in H2S and hence the former molecules are more tightly packed

(C) Of intermolecular hydrogen bonding in liquid H2O

(D) The latent heat of vaporisation is higher for H2O than for H2S

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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:  D2O 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
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