51.

Which of the following molecule or ions is a bidentate ligand?

• ${\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

• ${\mathrm{Br}}_2^{+}$

• ${\mathrm{CH}}_3{\mathrm{NH}}_2$

• ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{N}$

The number of moles of electrons required to deposit 1gm equivalent aluminium (atomic wt. = 27) from a solution of aluminium chloride will be

• 3

• 1

• 4

• 2

Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of a non-volatile solute is dissolved in 250 g of benzene, its vapour pressure is decreased to 120.2 mm. The molecular weight of the solute is

• 35.67 g

• 356.7 g

• 432.8 g

• 502. 7 g

Which of the following compound is not coloured?

• Na₂[CuCl₄]

• Na₂[CdCl₄]

• K₄[Fe(CN)₆]

• K₃[Fe(CN)₆]

Assertion: In some cases oxygen shows positive oxidation number though it is an electronegative element.

Reason : Fluorine is more electronegative than oxygen.

• 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 Assertion is false but Reason is true.

In the following reaction order, B is

${\mathrm{CH}}_3{\mathrm{CH}}_2-\mathrm{COOH} \stackrel{\mathrm{P}/{\mathrm{Br}}_2}{\to } \mathrm{A} \underset{{\mathrm{H}}^{+}}{\overset{\mathrm{alc}.\mathrm{KOH}}{\to }} \mathrm{B}$

• CH₂ =CH -COOH

• CH₂-CH(Br)-COOH

• CH₃CH₂COBr

• CH₃CH₂OH

The IUPAC name of the compound having the formula CCl₃CH₂CHO is

• 2, 2, 2-trichloropropanal

• 1,1, 1-trichloropropanal

• 3, 3, 3-trichloropropanal

• 1, 2, 1-dichloromethanal

Which of the following statements is not true about alcohols?

• Lower alochols have fiery taste and strong smell.

• As molecular mass increases the boiling point increases.

• Lower alcohols are water insoluble and their solubility increases with molecular weight.

• Lower alcohols are water soluble and their solubility decreases with molecular weight.

Assertion: o-Nitrophenol is more volatile than p-nitrophenol.

Reason : Intramolecular hydrogen bonding is present in o-nitrophenol while intermolecular H - bonding is in p-nitrophenol.

• 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 Assertion is false but Reason is true.

Assertion : CH₃OCH₃ and C₂H₅OH has comparable molecular weight but boiling point of C₂H₅OH is more than dimethyl ether.

Reason : C₂H₅OH forms intermolecular Hbonding while CH₃OCH₃ forms intramolecular H-bonding.

• 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 Assertion is false but Reason is true.