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Practice each question, then open the answer or worked solution.
If the density of a solution is 3.12 g mL-1, the mass of 1.5 mL solution in
significant figures is _______.
(i) 4.7g
(ii) 4680 × 10 -3g
(iii) 4.680g
(iv) 46.80g
Option (i) is the answer
Which of the following statements about a compound is incorrect?
physical methods of separation.
Option (iii) is the answer.
Which of the following statements is correct about the reaction given below:
4Fe(s) + 3O2(g) → 2Fe2O3(g)
oxygen in product therefore it follows the law of conservation of mass.
proportions is followed.
(iron or oxygen) in excess.
reactants (iron or oxygen) is taken in excess.
Option (i) is the answer.
Which of the following reactions is not correct according to the law of
conservation of mass.
Option (ii) is the answer.
Which of the following statements indicates that the law of multiple proportions is
being followed.
and oxygen in the ratio 1:2.
which combine with a fixed mass of carbon are in the simple ratio 2:1.
for the reaction is equal to the amount of magnesium in magnesium
oxide formed.
with 100 mL oxygen to produce 200 mL of water vapour.
Option (ii) is the answer.
Multiple Choice Questions (Type-11)
In the following questions, two or more options may be correct.
One mole of oxygen gas at STP is equal to _______.
(i) 6.022 × 1023 molecules of oxygen
(ii) 6.022 × 1023 atoms of oxygen
(iii) 16 g of oxygen
(iv) 32 g of oxygen
Option (i) and (iv) are the answers.
Sulphuric acid reacts with sodium hydroxide as follows:
H2SO4 + 2NaOH → Na2SO4+ 2H2O
When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0.1M
sodium hydroxide solution, the amount of sodium sulphate formed and its
molarity in the solution obtained is
(i) 0.1 mol L-1
(ii) 7.10 g
(iii) 0.025 mol L-1
(iv) 3.55 g
Option (ii) and (iii) are the answers.
Which of the following pairs have the same number of atoms?
Option (iii) and (iv) are the answers.
Which of the following solutions have the same concentration?
Option (i) and (ii) are the answers.
16 g of oxygen has the same number of molecules as in
(i) 16 g of CO
(ii) 28 g of N2
(iii) 14 g of N2
(iv) 1.0 g of H2
Option (iii) and (iv) are the answers.