60
Minutes
70
Questions
1 / -0
Marking
Q1. The reaction of ‘magnesium’ with air is
Exothermic reaction
Endothermic reaction
Reversible reaction
Substitution reaction
Q2. Magnesium ribbon is rubbed before burning because it has a coating of
basic magnesium carbonate
basic magnesium oxide
basic magnesium sulphide
basic magnesium chloride
Q3. What chemicals are used in fireworks?
Copper chloride
Calcium chloride
Barium chloride
All of above
Q4. The chemical formula of lead sulphate is
Pb2SO4
Pb(SO4)2
PbSO4
Pb2(SO4)3
Q5. When a magnesium ribbon is burnt in the air, the ash formed is
Black
White
Yellow
Pink
Q6. Which information is not conveyed by a balanced chemical equation?
Physical states of reactants and products
Symbols and formulae of all the substances involved in a particular reaction
Number of atoms/molecules of the reactants and products formed
Whether a particular reaction is actually feasible or not
Q7. The color of magnesium oxide is
White
Blue
Grey
Pink
Q8. Chemically rust is
hydrated ferrous oxide
only ferric oxide
hydrated ferric oxide
none of these
Q9. When carbon dioxide is passed through lime water,
Calcium hydroxide is formed
A white precipitate of CaO is formed
Lime water turns milky
Color of lime water disappears.
Q10. Both CO2 and H2 gases are
heavier than air
colorless
acidic in nature
soluble in water
Q11. When crystals of lead nitrate are heated strongly in a dry test tube
Crystals immediately melt
A brown residue is left
White fumes appear in the tube
A yellow residue is left
Q12. Which of the following gases can be used for the storage of fresh samples of oil for a long time?
Carbon dioxide or oxygen
Nitrogen or helium
Helium or oxygen
Nitrogen or oxygen
Q13. Consider equations: Ca⁺²(aq) + 2OH‾(aq)→Ca(OH)₂ (s). The precipitate of calcium hydroxide will be of
Green color
Blue color
Brown color
White color
Q14. In writing chemical equations, the inclusion of state symbols shall be done while
Correct chemical formulae of reactants and products are written
The equation is being balanced to fulfill the law of conservation of mass
The equation has been balanced
The chemical formulae of products and reactants have been changed to bring about quick balancing
Q15. The electrolytic decomposition of water gives H2 and O2 in the ratio of
1: 2 by volume
2: 1 by volume
8: 1 by mass
1: 2 by mass
...and 55 more challenging questions available in the interactive simulator.