PYQ Vault

Day 188: CBSE Class 10 Science

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

  1. Question 1

    How do Organisms Reproduce?. Asked once: 2022 (same type asked 3 times)

    4
    (a) Name the reproductive and non-reproductive parts of bread mould (Rhizopus). (b) List any two advantages of vegetative propagation.

  2. Question 2

    Acids, Bases and Salts. Asked once: 2025 (same type asked 2 times)

    3
    The chlorine produced during the electrolysis of brine solution is used in the manufacture of :

    Tap an option to check your answer.

  3. Question 3

    Acids, Bases and Salts. Asked once: 2025 (same type asked 2 times)

    28 (a)
    Common salt is an important raw material for various chemicals of daily use. State in brief the method of preparation of (i) Sodium hydroxide, and (ii) Sodium hydrogen carbonate from common salt. Write balanced chemical equations of the reactions that occur.

  4. Question 4

    Metals and Non-metals. Asked once: 2025 (same type asked 2 times)

    7
    The formation of magnesium oxide is correctly shown in option :

    Tap an option to check your answer.

  5. Question 5

    Acids, Bases and Salts. Asked once: 2024 (same type asked 2 times)

    34 (a)
    A few crystals of ferrous sulphate were taken in a dry boiling tube and heated. Tiny water droplets were observed in the tube after some time. (i) From where did these water droplets appear ? Explain. (ii) What colour change will be observed during heating ? (iii) How many molecules of water are attached per molecule of FeSO4\mathrm{FeSO_4} crystal ? Write the molecular formula of crystalline forms of (I) Copper sulphate, and (II) Sodium carbonate. (iv) State how is Plaster of Paris obtained from gypsum. Write two uses of Plaster of Paris.