PYQ Vault

Day 56: CBSE Class 10 Science

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

  1. Question 1

    Metals and Non-metals. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    25
    (a) What are amphoteric oxides ? (b) Categorise the following based on their nature : ZnO\mathrm{ZnO}, Na2O\mathrm{Na_2O}, CO2\mathrm{CO_2}

  2. Question 2

    Metals and Non-metals. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    21
    Which one of the following metals neither reacts with cold water nor reacts with hot water but reacts with steam ?

    Tap an option to check your answer.

  3. Question 3

    Metals and Non-metals. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    25
    Comment on the following properties of ionic compounds and give reason in support of your answer : (i) Physical nature (ii) Melting and boiling points

  4. Question 4

    Metals and Non-metals. This type asked 3 times: 2023, 2024, 2026. This one: 2026

    29 (B)
    (i) Write the balanced chemical equations when : (I) A mixture of Cu2O\mathrm{Cu_2O} and Cu2S\mathrm{Cu_2S} is heated. (II) ZnS\mathrm{ZnS} is heated in the presence of oxygen. (ii) Give reasons for the following : (I) The wires carrying current in homes have a coating of PVC. (II) To make hot water tanks, copper is used and not steel. (iii) Show the formation of ionic compound CaO\mathrm{CaO} with electron dot structure. [Atomic number : Ca = 20, O = 8]

  5. Question 5

    Our Environment. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    12
    In the following food chain, 5 J of energy is available to man. Calculate, how much energy was available at the producer level. Why ? Plant ⟶\longrightarrow Goat ⟶\longrightarrow Man