PYQ Vault

Day 155: CBSE Class 10 Science

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

  1. Question 1

    Acids, Bases and Salts. Asked once: 2023 (same type asked 3 times)

    28
    (a) Suggest one remedial measure each to counteract the change in pH in human beings in following cases : (i) Production of too much acid in stomach during indigestion (ii) Stung by a honey bee / nettle leaves (b) Fresh milk has a pH of 6. When it changes into curd will its pH increase or decrease ? Why ?

  2. Question 2

    Acids, Bases and Salts. Asked once: 2023 (same type asked 3 times)

    2
    A solution turns the colour of turmeric to reddish brown. If the same solution is poured on universal indictor, its colour would change to –

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  3. Question 3

    Acids, Bases and Salts. Asked once: 2023 (same type asked 3 times)

    4
    There are four solutions A, B, C, and D with pH values as follows :
    SolutionABCD
    pH2.07.08.012.0
    Which solution(s) would liberate hydrogen gas with zinc ?

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  4. Question 4

    Acids, Bases and Salts. Asked once: 2023 (same type asked 3 times)

    1
    In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the solution ‘X’ the solution ‘X’ first turns milky and then colourless. The option that justifies the above stated observation is that ‘X’ is aqueous calcium hydroxide and

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  5. Question 5

    Carbon and its Compounds. Asked once: 2026 (same type asked 3 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    24
    Assertion (A) : Carbon shows the property of catenation. Reason (R) : This is due to strong C – C bond.

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