Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH₃. Mass of sodium nitrate absorbing 1 mole of electron will be

• 7.750

• 10.625

• 8.000

• 9.875

In transforming 0.01 mole of PbS to PbSO₄, the volume of '10 volume' H₂O₂ required will be

• 11.2 mL

• 22.4 mL

• 33.6 mL

• 44.8 mL

An unknown element forms an oxide.What will be the equivalent weight of the element if the oxygen content is 20% by weight?

• 16

• 32

• 8

• 64

2 N HCl solution will have same molar concentration as a

• 4.0 N H₂SO₄

• 0.5 N H₂SO₄

• 1 N H₂SO₄

• 2 N H₂SO₄

Which has maximum number of atoms ?

• 24 g of C

• 56 g of Fe

• 26 g of Al

• 108 g of Ag

35.4 ml of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is ?

• 0.97 N

• 0.142 N

• 0.194 N

• 0.244 N

Which of the following has the smallest number of molecules ?

• 0.1 mole of CO₂ gas

• 11.2 L of CO₂ gas at STP

• 22 g of CO₂ gas

• 22.4 x 10³ mL of CO₂ gas at STP

The value of amu is which of the following ?

• 1.57 × 10^-24 kg

• 1.66 × 10^-24 kg

• 1.99 × 10^-23 kg

• 1.66 × 10^-27 kg

369.

4.6 x 10²² atoms of an element weigh 13.8g. The atomic weight of that element is

• 290

• 180

• 34.4

• 10.4

2g of mixture of CO and CO₂ on reaction with excess I₂O₅ produced 2.54g of I₂. What would be the mass% of CO₂ in the original mixture?

• 60

• 30

• 70

• 35