IMPORTANT QUESTIONS

1. Q131 ____is a dark-colored, Viscous & foul-smelling liquid mined from the earth.

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2. Q132 What is the range of pH within which our body works?

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3. Q133 What effect does the concentration of H⁺ (aq) ions have on the nature of solutions?

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4. Q134 Fill in the blanks with = , > or <. For basic solutions [H⁺] ____[OH⁻]

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5. Q135 Write the ways by which the rusting of iron can be prevented.

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6. Q136 When an electric current flows through a metallic wire, the particles moving are?

   • (a) protons
   • (b) atoms
   • (c) tones
   • (d) electrons

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7. Q137 A student dissolved 1g of sugar in 10 ml of distilled water in a beaker A. He dissolved 10 g of sugar in 100 ml of distilled water in beaker B. Then he dropped a few raisins, in each. After two hours he found the raisins,

   • (a) swollen in A and shrunken in B
   • (b) shrunken in A and swollen in B
   • (c) swollen in both
   • (d) shrunken in both

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8. Q138 Products of photosynthesis are

   • (a) ADP and NADPH
   • (b) ATP and NADPH
   • (c) ADP and NADP
   • (d) ATP and NADP

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9. Q139 The energy produced during respiration is stored in the form of:

   • (a) ADP
   • (b) NADP
   • (c) ATP
   • (d) HTP

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10. Q140 Which of the following is present in guard cells :

    • (a) nucleus
    • (b) Chloroplast
    • (c) both chloroplast and nucleus
    • (d) none of these.

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