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A visible change is observed when a strip of iron is placed in an aqueous solution of
Which of the compounds will leave a metal residue when heated?
CuSO4 5H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations . if all the marble chips reacted, which of the following remained the same in each case?
What will happen if more heat is applied to the following system at equilibrium? X2(g) + 3Y 2(g) ⇌ 2XY3(g); ∆H =-kJmol -1
Which of the following salt solutions will have a pH greater than 7?
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40 g mol]
Which of the following substances increases in mass when heated in air?
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