The mass of 112cm³ of NH₃ gas at STP is

• 0.085g

• 0.850g

• 8.500g

• 80.500g

The number of moles of hydrogen that can be added to 1 mole of an oil is the highest in

• groundnut oil

• sunflower seed oil

• mustard oil

• linseed oil

The volume of 0.1 M oxalic acid that can be completely oxidized by 20 mL of 0.025 M KMnO₄ solution is

• 25 mL

• 12.5 mL

• 37.5 mL

• 125 mL

The vapour pressures of two liquids A and B in their pure states are in the ratio of 1: 2. A binary solution of A and B contains A and B in the mole proportion of 1 : 2. The mole fraction of A in the vapour phase of the solution will be

• 0.2

• 0.25

• 0.52

• 0.33

195.

On adding which of the following, the pH of 20 mL of 0.1 N HCl will not alter?

• 20 mL of distilled water

• 1 mL of 0.1 N NaOH

• 500 mL of HCl of pH =1

• 1 mL of 1 N HCl

The equivalent mass of a certain bivalent metal is 20. The molecular mass of its anhydrous chloride is

• 111

• 55.5

• 75.5

• 91

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is [At. mass of Ca = 40]

• 80

• 10

• 16

• 8

1.78 g of an optically active L-amino acid (A) is treated with NaNO₃/ HCl at 0°C. 448 cm³ of nitrogen was at STP is evolved. A sample of protein has 0.25% of this amino acid by mass. The molar mass of the protein is

• 36500 g mol^-1

• 34500 g mol^-1

• 35400 g mol^-1

• 35600 g mol^-1

10 g of a mixture of BaO and CaO requires 100 cm³ of 2.5 M HCl to react completely. The percentage of calcium oxide in the mixture is approximately (Given: molar mass of BaO = 158)

• 52.6

• 55.1

• 44.9

• 47.4

Impure copper containing Fe, Au, Ag as impurities is electrolytically refined. A current of 140 A for 482.5 s decreased the mass of the anode by 22.26 g and increased the mass of cathode by 22.011 g. Percentage of iron in impure copper is (Given molar mass Fe = 55.5 g mol^-1, molar mass Cu = 63.54 g mol^-1)

• 0.95

• 0.85

• 0.96=7

• 0.90