Class 10 Science MCQs – Chapter 1 Chemical Reactions And Equations
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Class 10 Science MCQs – Chapter 1 Chemical Reactions And Equations
Q. 8 Which among the following statement(s) is /are true? Exposure of silver
chloride to sunlight for a long duration turns grey due to
(i) the formation of silver by decomposition of silver chloride.
(ii) sublimation of silver chloride.
(iii) decomposition of chlorine gas from silver chloride.
(iv) oxidation of silver chloride.
(a) (i) Only (b) (i) and (iii) (c) (ii) and (iii) (d) Only (iv)
Ans. (a) (i) Only
Q. 9 Solid calcium oxide reacts vigorously with water to form calcium hydroxide
accompanied by liberation of heat. This process is called slaking of lime.
Calcium hydroxide dissolves in water to form its solution called lime
water. Which among the following is are true about slaking of lime and
the solution formed?
(i) It is an endothermic reaction.
(ii) It is exothermic reaction.
(iii) The pH of the resulting solution will be more than seven.
(iv) The pH of the resulting solution will be less than seven.
(a) (i) and (ii) (b) (ii) and (iii)
(c) (i) and (iv) (d) (iii) and (iv)
Ans. (b)(ii) and (iii)
Q. 10 Barium chloride on reacting with ammonium sulphate forms barium
sulphate and ammonium chloride. Which of the following correctly
represents the type of the reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
(a) Only (i) (b) Only (ii)
(c) Only (iv) (d) (ii) and (iv)
Ans. (d) (ii) and (iv)
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