PYQ Vault

Day 117: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

  1. Question 1

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    34 (a)
    (i) Consider the following metals : K, Ca, Al, Cu, Ag, Fe Select from the above metals, a metal which I. does not react with oxygen even at high temperature. II. reacts with oxygen at ordinary temperature and forms a protective oxide layer which prevents the metal from further oxidation. III. catches fire when kept in the open. IV. does not burn in oxygen but the hot metal is coated with a black coloured oxide layer. (ii) What are amphoteric oxides ? With the help of balanced chemical equations show that aluminium oxide is an amphoteric oxide. (iii) What are alkalis ? Give one example.

  2. Question 2

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    17
    Assertion (A) : The metals high up in the reactivity series cannot be obtained from their compounds by heating with carbon. Reason (R) : Displacement reactions can also be used to obtain metal.

    Tap an option to check your answer.

  3. Question 3

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    28 (a)
    Observe the following diagram showing an experiment to determine the conditions under which a metal ‘M’ corrodes. List your observations in each of the three cases A, B and C with reason, if the metal ‘M’ is generally protected against corrosion by the method of galvanisation.

  4. Question 4

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    17
    Assertion (A) : Ductility is that property of metals which enables copper to be used in making cooking utensils. Reason (R) : Copper is a metal which is ductile as well as malleable.

    Tap an option to check your answer.

  5. Question 5

    Metals and Non-metals. Asked once: 2025 (same type asked 4 times)

    21
    A light green coloured solution of sulphate salt of metal ‘P’ is taken in a beaker, a rod of another metal “Q’ is put in this solution as shown the following figures : Identify the metals ‘P’ and ‘Q’ and write its chemical equation for the reaction that occurs. State the conclusion of this reaction in terms of reactivity series of metals.