Metals and Non-metals MCQ
1. Which of the following property is generally not shown by metals?
(a) Electrical conduction
(b) Sonorous in nature
(c) Dullness
(d) Ductility
Ans. (c) Dullness
2. The ability of metals to be drawn into thin wire is known as
(a) ductility
(b) malleability
(c) sonorousity
(d) conductivity
Ans. (a) Ductility
3. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Ans. (d) (i) and (iv)
Explanation: Electrical conductivity and ductility have no relevance for a cooking utensil.
4. Which one of the following metals do not react with cold as well as hot water?
(a) Na
(b) Ca
(c) Mg
(d) Fe
Ans. (d) Iron (Fe)
Explanation: Sodium and calcium react vigorously with water. magnesium reacts with hot water to form magnesium oxide. Iron reacts with steam.
5. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
(a) FeO
(b) Fe2O3
(c) Fe3O4
(d) Fe2O3 and Fe3O4
Ans. (c) Fe3O4
Explanation: Following equation shows the reaction between iron and steam:
3Fe+ 4H2O → Fe3O4 + 4H2O
6. What happens when calcium is treated with water?
(i) It does not react with water
(ii) It reacts violently with water
(iii) It reacts less violently with water
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)
Ans. (d) (iii) and (iv)
Explanation: Calcium reacts less violently with water. it starts floating because it sticks to hydrogen bubbles
Ca + H2O -> Ca(OH)2 + H2
7. Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
(a) H2SO4
(b) HCl
(c) HNO3
(d) All of these
Ans. (c) HNO3
Explanation: Nitric acid is a potent oxidizing agent. It reacts with hydrogen to form water.
8. The composition of aqua-regia is
(a) Dil. HCl: Conc. HNO3 (3:1)
(b) Conc. HCl: Dil.HNO3 (3:1)
(c) Conc. HCl: Conc.HNO3 (3:1)
(d) Dil. HCl: Dil. HNO3 (3:1)
Ans. (b) Conc. HCl: Dil. HNO3 (3:1)4
9. Which of the following are not ionic compounds?
(i) KCl
(ii) HCl
(iii) CCl4
(iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Ans. (b) (ii) and (iii)
Explanation: These are covalent compounds. Both the constituents in each compound are non-metals.
