PYQ Vault

Day 151: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    28
    State reasons for the following : (a) Zinc oxide is an amphoteric oxide. (b) Calcium starts floating when immersed in water. (c) In the reactions of nitric acid with metals, generally hydrogen gas is not evolved.

  2. Question 2

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

    27
    (a) “Displacement reactions also play a key role in extracting metals in the middle of the reactivity series.” Justify this statement with two examples. (b) Why can metals high up in the reactivity series not be obtained by reduction of their oxides by carbon ?

  3. Question 3

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

    3
    Which one of the following metals is protected from corrosion by a layer of its own oxide ?

    Tap an option to check your answer.

  4. Question 4

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

    28
    Design an activity to show that metals are good conductors of heat and have high melting points.

  5. Question 5

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

    28
    Study the experimental set-up given in the figure and answer the following questions : (a) Identify these metals from the following which can be used as “metal sample” in the given set-up : Aluminium, Copper, Iron, Lead, Silver (b) Write balanced chemical equations for the reaction in each case.