The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is

• A. dissolution → dryness → filtration → evaporation
• B. filtration → sublimation → evaporation → dryness
• C. sublimation → dissolution → filtration → evaporation
• D. dissolution → filtration → sublimation → evaporation

The idea of planetary electron was that of

• A. Rutherford
• B. Thompson
• C. Bohr
• D. Dalton

Dynamic equilibrium describes a situation where

• A. a reaction gives back the reactant
• B. te concentration of the reactant and products is equal
• C. both forward and and reverse reactions proceed at the same rate
• D. reactants are converted to products

If 30cm3 of gas at 50oC is warmed to 80o at a fixed pressure, the fractional increase in volume is

• A. 0.009
• B. 0.093
• C. 0.910
• D. 1.090

On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?

• A. Ca(NO3)2
• B. Cu(NO3)2
• C. AgNO3
• D. NaNO3

Zinc and carbon rods are used as anode and cathode respectively in a

• A. Leclanche cell
• B. lead accumulator
• C. Daniel cell
• D. voltaic cell

The volume of 2.5 moles of oxygen at s.t.p is [Molar volume of a gas at s.t.p = 22.4 dm³]

• A. 50.0 dm³
• B. 84.0 dm³
• C. 28.0 dm³
• D. 56.0 dm³

The gas obtained as a product of anaerobic action on organic matter buried in the earth is

• A. ethene
• B. methane
• C. carbon (IV) oxide
• D. nitrogen (IV) oxide

The ion that can be used as an oxidizing agent is

• A. Au₃₊
• B. Fe₃₊
• C. ClO_-
• D. Ca₂₊

When 50cm² of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is

• A. 2.0 mol dm^-3
• B. 3.5 mol dm^-3
• C. 7.0 mol dm^-3
• D. 10.0 mol dm^-3