Find the CBSE Class 10th MCQs Practice Paper – Chemistry (Science) with answer keys. These questions will not only help the students to prepare for exams in a better manner, but will also help them in understanding the depth with which a topic should be studied.
Few sample questions from the Question Paper are given below:
Q. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:
(a) Make the ribbon surface shinier.
(b) Remove the layer of magnesium oxide from the ribbon surface.
(c) Remove the layer of magnesium carbonate from the ribbon surface.
(d) Remove the moisture from the ribbon surface.
Q. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle.
Identify the acid X and gas evolved Y.
(a) X- Sulphuric acid and Y- Oxygen gas
(b) X- Hydrochloric acid and Y- Oxygen gas
(c) X- Sulphuric acid and Y- Hydrogen gas
(d) X- Hydrochloric acid and Y- Hydrogen gas
Q. Among the following choose the statement which is not true regarding the properties of metals:
(a) Metals are ductile.
(b) Metals react with dilute acids to produce carbon dioxide.
(c) Metals combine with oxygen to form basic oxides.
(d) Metals combine with chlorides to form ionic chlorides.
Q. A colourless organic liquid X of molecular formula C2H6O does not give any colour change when treated with litmus solution. It is used in the preparation of iodine tincture. Identify the compound:
(a) Ethanal
(b) Ethanol
(c) Ethanone
(d) Methoxy methane
Q. The electropositive character of an element measures its tendency to:
(a) Lose the valence electrons
(b) Gain the electrons
(c) Form the compounds
(d) React with oxygen
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