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A substance is said to be hygroscopic if it absorbs?
Which of the following acids forms normal salts only?
A major factor considered in selecting a suitable method for preparing a simple salt is its
The gas given off when NH4Cl is heated with an alkali is
Which of the following decreases when a given mass of gas is compressed to half its initial volume?
If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is
The conclusion from Rutherford's radioactive substance alpha-scattering experiment is that
Waste plastics accumulate in the soil and pollute the environment because plastic materials are
Acidic industrial waste can be treated with
Which of the following reactions represents the change that occurs when a photographic film is exposed to sunlight?
If 10 cm 3 of distilled water is added to 10 cm3 of an aqueous salt solution, the concentration of the solution
Sugars can be hydrolyzed at room temperature by the action of
Which of the following constitutes an advantage in the use of hard water?
What is the function of H2SO4 in the following reaction?
C12H22O11 conc. H2SO4 → 12C + 11H2O
Which of the following polymers contains nitrogen?
One of the products of combustion of pentane in excess air is
Benzene produces more soot than ethene on burning because benzene
Hydrogenation of butene yields
A feasible cell was constructed by joining the two half cells below. Cu\(^{2+}\) (aq) + 2e\(^-\) → Cu(s) E\(^0\) = +0.34 V; Zn\({^2+}\) + 2e\(^-\) → Zn\((_s)\) E\(^0\) = - 0.76V. What is the standard e.m.f. of the cell?