Class 10 Science Chapter 1 Important Questions Chemical Reactions and Equations


Important questions for Chemical Reactions and Equations Chapter 1 Class 10 Science with solutions. Extra questions for class 10 Science Chapter 1.


    Q1:

    When copper powder is heated in a watch glass, a black substance is formed. (i) Why is this black substance formed ? Name it. (ii) How can this black substance be reversed to its original form ?

    CBSE [2023]

    Easy

    Q2:

    In the given experimental set-up, if the experiment is carried out separately with each of the following solutions the cases in which the bulb will glow is/are :

    Important question of Class 10

    (i) Dilute hydrochloric acid (ii) Dilute sulphuric acid (iii) Glucose solution (iv) Alcohol (a) (i) only (b) (ii) only (c) (i) and (ii) (d) (ii), (iii) and (iv)

    CBSE [2023]

    Easy

    Q3:

    \(MnO_2 + x HCl ⟶ MnCl_2 + y H_2O + z Cl_2 \) In order to balance the above chemical equation, the values of x, y and z respectively are:

    (a) 6, 2, 2 (b) 4, 1, 2 (c) 4, 2, 1 (d) 2, 2, 1

    CBSE [2023]

    Easy

    Q4:

    The emission of brown fumes in the given experimental set-up is due to

    Important question of Class 10

    (a) thermal decomposition of lead nitrate which produces brown fumes of nitrogen dioxide. (b) thermal decomposition of lead nitrate which produces brown fumes of lead oxide. (c) oxidation of lead nitrate forming lead oxide and nitrogen dioxide. (d) oxidation of lead nitrate forming lead oxide and oxygen.

    CBSE [2023]

    Easy

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