MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers
1. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
2. In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is
3. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
4. Fatty foods become rancid due to the process of
5. A substance added to food containing fats and oils is called:
6. We store silver chloride in a dark coloured bottle because it is
7. What type of chemical reactions take place when electricity is passed through water?
8. Select the oxidising agent for the following reaction: H2S + I2 > 2HI + S
9. A substance added to food containing fats and oils is called:
10. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
11. Which of the following is not physical change?
12. Which of the following is true for an unbalanced chemical equation?
13. Which option denotes a double displacement reaction?
14. The following reaction is used for the preparation of oxygen gas in the laboratory: Which of the following statement about the reaction is correct?
15. Which of the following is Not True with respect to the neutralisation reaction?
16. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
17. Combustion reactions are always
18. Which one of the following processes involve chemical reactions?
19. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
20. Magnesium ribbon is rubbed before burning because it has a coating of
21. The chemical formula of lead sulphate is
22. When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because
23. Which information is not conveyed by a balanced chemical equation?
24. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
25. Chemically rust is
26. Both CO2 and H2 gases are
27. Pb + CuCl2 → PbCl2 + Cu The above reaction is an example of:
28. Which of the following gases can be used for storage of fresh sampel of an oil for a long time?
29. Name the products formed when iron filings are heated with dilute hydrochloric acid
30. The electrolytic decomposition of water gives H2 and O2 in the ratio of
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