NEET Questions Solved


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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(d) Dipole-dipole attraction give rise to more tendency for aggregation.

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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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(c) It is a fact

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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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(d)     3Fe + 4H2O(v)      Fe3O4 + 4H2Red hot

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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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(B).   Solubility of ionic compounds is less in heavy 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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(C). The b.p of H2O is higher than that of H2S because of intermolecular hydrogen bonding in

       liquid H2O

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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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(B).  Water molecules can form two hydrogen bonds through its two hydrogen atoms and another

        two with two lone pairs of electrons on the O atom. 

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Assertion : D2O is called hard water.

Reason : Its degree of dissociation is high.

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(B). D2O is called heavy water. Due to stronger DO bonds, the degree of dissociation of D2O is

       lower than that of H2O.

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