0.02 mole of [Co(NH₃)₅Br]Cl₂ and 0.02 mole of [Co(NH₃)₅Cl]SO₄ are present in 200 cc of a solution X. The number of moles of the precipitates Y and Z that are formed when the solution X is treated with excess barium chloride are respectively.

• 0.02, 0.02

• 0.01, 0.02

• 0.02, 0.04

• 0.04, 0.02

The maximum prescribed concentration of cadmium in drinking water in ppm is

• 0.05

• 3

• 2

• 0.005

A 100% pure sample of a divalent metal carbonate weighing 2 g on complete thermal decomposition releases 448 cc of carbon dioxide at STP. The equivalent mass of the metal is

• 40

• 20

• 28

• 12

A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K. The mixture reacts completely with $\frac{10}{3}$mole of O₂ to produce CO₂ and H₂O. The mole fraction of ethane and ethene in the mixture are respectively (R = 0.082 L atm K^-1 mol^-1)

• 0.50, 0.50

• 0.75, 0.25

• 0.67, 0.33

• 0.25, 0.75

Molar heat capacity of aluminium is 25 JK^-1 mol^-1. The heat necessary to raise the temperature of 54 g of aluminium (atomic mass 27 g mol^-1) from 30°C to 50°C is

• 1.5 kJ

• 0.5 kJ

• 1.0 kJ

• 2.5 kJ

How much time (in hours) would it take to distribute one Avogadro number of wheat grains, if 10²⁰ grains are distributed each second?

• 0.1673

• 1.673

• 16.73

• 167.3

At 25°C, at 5% aqueous solution of glucose (molecular weight = 180g mol^-1) is isotonic with a 2% aqueous solution containing and unknown solute. What is the molecular weight of the unknown solute?

• 60

• 80

• 72

• 63

200 mL of water is added to a 500 mL of 0.2 M solution. What is the molarity of this diluted solution?

• 0.5010M

• 0.2897M

• 0.7093

• 0.1428

Which of the following pairs of substances would give same gaseous product on reaction with water?

• Na and Na₂O₂

• Ca and CaH₂

• Ca and CaO

• Ba and BaO₂

When 200 mL of aqueous solution of HCl (pH = 2) is mixed with 300 mL of an aqueous solution of NaOH (pH = 12) the pH of the resulting mixture is

• 10

• 2.7

• 4.0

• 11.3