How many moles of O₂ can be obtained by electrolysis of 90 g H₂O?

• 5.0 mol

• 0.5 mol

• 2.5 mol

• 0.25 mol

An organic compound A contains 20% C, 46.66% N and 6.66% H. It gives NH₃ gas on heating with NaOH. A can be

• CH₃CONH₂

• C₆H₅CONH₂

• NH₂CONH₂

• CH₃NHCONH₂

The empirical formula of a compound is CH₂. One mole of this compound has a mass 42g. Its molecular formula is

• C₃H₆

• C₂H₆

• CH₂

• C₂H₂

Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield

• sulphur trioxide and water

• hydrogen and sulphurous acid

• sulphur and water

• hydrogen peroxide and sulphur

3 g of oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of metal is

• 12

• 20

• 33.25

• 2.325

4.9 g of H₂SO₄ is present in 100 mL solution. The molarity and normality of the solution will be

• Molarity = 1M, Normality= 0.5N

• Molarity = 1M, Normality= 0.25N

• Molarity = 0.5M, Normality= 1N

• Molarity = 2M, Normality= 3N

157.

0.0833 mole of a carbohydrate of empirical formula CH₂O contains 1.00 g of hydrogen. The molecular formula of the carbohydrate is.

• C₅H₁₀O₅

• C₃H₄O₃

• C₁₂H₂₂O₁₁

• C₆H₁₂O₆

When 50cm³ of 0.2N H₂SO₄ is mixed with 50 cm³ of 1N KOH, the heat liberated is

• 11.46 kJ

• 57.3 kJ

• 573 kJ

• 573 J

Heat liberated with 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl

• 11.56 kJ

• 5.73 kJ

• 22.92 kJ

• 17.19 kJ

A solution contains 1.2046 x 10²⁴ hydrochloric acid molecules in one dm³ of the solution. The strength of the solution is

• 6N

• 2N

• 4N

• 8N