Class 7 - Chemistry Set 4
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1. Which of the following statements is correct? *
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2. Arrange the ompounds in sequence of increasing number of oxygen atoms.(a) Sugar(b) Plaster of paris(c) Starch (d) Glucose *
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3. Which of the following acid is present in sour milk ? *
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4. Which gas is called as fire-fighting gas? *
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5. Chemical substance that promote chemical reaction but remain unaffected are known as ________. *
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6. Thin sheet of which metal was used in Rutherford's alpha–particle scattering experiment? *
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7. Complete the reactionZn + 2HCl → _______ + H2↑ *
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8. Which of the following scientist discovered that atom contains electron? *
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9. Water is often treated with chlorine to *
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10. Open drains are a hazard because *
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11. Which of the following is NOT a source of ground water ? *
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12. Find odd one out *
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13. How many chemical reactions from the given reactions are exothermic reactions?<table class='rte_tbl' width='493' height='26' cellspacing='0' cellpadding='0' border='1' align=''><tbody><tr><td width='100%%'> Melting of Ice cube, mixing of salt and water condensation of vapour into water, cooking of egg, rusting of iron, acid-base reaction (neutralisation)</td></tr></tbody></table> *
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14. Non metals having lustre include : *
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15. The scientific name of silkworm is *
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16. All oxides and hydroxides of metals are generally : *
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17. When an iron spade is left lying in a moist atmosphere it *
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18. General Assembly of the United Nations on
 22 march, 2005 declared the period _______ as the International Decade for action and
 'Water for life'.
*
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19. Naturally occurring indicator litmus is *
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20. Which of the following is an eco-friendly fuel ? *
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