PYQ Vault

Day 37: CBSE Class 10 Science

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

  1. Question 1

    Our Environment. This type asked 5 times: 2022, 2023, 2024, 2025, 2026. This one: 2026

    12
    Suggest one best way to dispose of the following wastes : (i) Kitchen waste (ii) Metallic waste (iii) Plastic bottles (iv) Sanitary waste

  2. Question 2

    Carbon and its Compounds. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    29 (a)
    (i) What is homologous series ? Which two of the following organic compounds belong to the same homologous series ? C2H4\mathrm{C_2H_4}, C4H10\mathrm{C_4H_{10}}, C3H4\mathrm{C_3H_4}, C4H8\mathrm{C_4H_8} (ii) Write the product(s) in the following reactions : (I) CH3−CH2−OH+CH3COOH→Acid\mathrm{CH_3-CH_2-OH + CH_3COOH \xrightarrow{\text{Acid}}} (II) C2H5OH+O2→Burning\mathrm{C_2H_5OH + O_2 \xrightarrow{\text{Burning}}} (iii) Why does micelle formation take place when soap is added to water ?

  3. Question 3

    Chemical Reactions and Equations. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    26
    What happens when (i) lead (II) nitrate is heated ? (ii) iron (II) sulphate is heated ? (iii) silver chloride is exposed to sunlight ? Write balanced chemical equations of the reactions involved in support of your answer.

  4. Question 4

    Chemical Reactions and Equations. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    26
    Give reasons : (i) Potato chips manufacturers fill the packet of chips with nitrogen gas. (ii) Respiration is an exothermic reaction. (iii) Silver chloride is stored in dark coloured bottles.

  5. Question 5

    Chemical Reactions and Equations. This type asked 4 times: 2023, 2024, 2025, 2026. This one: 2026

    17
    (i) AgNO3+NaCl⟶NaNO3+AgCl\mathrm{AgNO_3 + NaCl \longrightarrow NaNO_3 + AgCl} (ii) K2SO4+BaCl2⟶BaSO4+2KCl\mathrm{K_2SO_4 + BaCl_2 \longrightarrow BaSO_4 + 2KCl} Which of the following options clearly describes both the reactions ?

    Tap an option to check your answer.