CLASS: X-SCIENCE
CHAPTER: METALS AND NON-METALS
MCQ
1. Which
of the following metals is present in the anode mud during the electrolytic
refining of copper?
(a)
Sodium (b) Aluminium (c) Gold (d) Iron
2. An
element reacts with oxygen to give a compound with a high melting point. The
compound is soluble in water. The element is likely to be
(a)
calcium (b) carbon (c) iron (d) silicon
3. The
second most abundant metal in the earth’s crust is
(a)
oxygen (b) silicon (c) aluminium (d) iron
4. An alloy
of Zn and Cu is dissolved in dil. HC1. Hydrogen gas is evolved. In this
evolution of gas
(a)
only zinc reacts with dil. HC1 (b) only copper reacts with dil. HC1
(c)
both zinc and copper react with dil. HC1 (d) only copper reacts with water
5. A
greenish coating develops on copper utensils due to formation of
(a)
CuCo3 (b) Cu(OH)2 (c) Cu(OH)2.CuCO3 (d) CuO
6. Rusting
of iron takes place in
(a)
ordinary water (b) distilled water
(c)
both ordinary and distilled water (d) none of the above
7. The
bronze medals are made up of
(a)
Cu and Zn (b) Zn and Ni (c) Cu and Sn (d) Cu, Zn, Tn
8. Silver
articles becomes black on prolonged exposure to air. This is due to the
formation of
(a)
Ag2O (b) Ag2S (c) AgCN (d) Ag2O and Ag2S
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2
9. During
smelting, an additional substance is added which combines with impurities to
form a fusible product known as
(a)
slag (b) mud (c) gangue (d) flux
10. A
student placed an iron nail in copper sulphate solution. He observed the
reddish brown coating on the iron nail which is
(a)
soft and dull (b) hard and flading (c) smooth and shining (d) rough and
granular
11. Which
among the following alloys contain non-metal as one of its constituents?
(a)
Brass (b) Amalgam (c) Gun metal (d) None of these
12. An
aluminium strip is kept immersed in freshly prepared ferrous sulphate solution
taken in a test tube, the change observed is that
(a)
Green solution slowly turns brown
(b)
Lower end of test tube become slightly warm
(c)
A colourless gas with the smell of burning sulphur is observed
(d)
Light green solution changes to blue.
Answers
1.
(d) 2. (c) 3. (d)
4.
(a) 5. (a) 6. (c) 7. (c) 8. (b)
9.
(a) 10. (d) 11. (b) 11. (a)
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