Chemical Reactions And Equations
- 1.The electrolytic decomposition of water gives H2 and O2 in the ratio of
- A.
1:2 by volume
- B.
2:1 by volume
- C.
8:1 by mass
- D.
1:2 by mass
- 2.The chemical formula of lead sulphate is Pb(SO4)2
- A.
True
- B.
False
- 3.In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of
- A.
Hydrochloric acid
- B.
Barium sulphate
- C.
Chlorine
- D.
Sulphur
- 4.A chemical reaction does not involve:
- A.
Formation of new substances having entirely different properties than that of the reactants
- B.
Breaking of old chemical bonds and formation of new chemical bonds
- C.
Changing of the atoms of on element into those of another element to form new products
- D.
Rearrangement of the atoms of reactants to form new products
- 5.On decomposition of lead nitrate [Blank] gas (write name) is evolved which is [Blank] in colour.
- 6.Which of the following product is formed when calcium oxide reacts with water?
- A.
Slaked lime
- B.
Carbon dioxide
- C.
Calcium oxide
- D.
Oxygen gas
- 7.What happens when carbon dioxide is passed in lime water?
- A.
Lime water turns milky because of formation of water
- B.
Lime water turns milky because of formation of calcium carbonate
- C.
Lime water turns red because of formation permanganate
- D.
Lime water turns red because of formation of copper sulphate
- 8.What happens when Copper metal is dipped in the solution of zinc sulphate?
- A.
Copper sulphate is formed
- B.
Zinc metal is separated
- C.
Oxygen gas is formed
- D.
No reaction takes place
- 9.Which of the following is termed as rancidity?
- A.
Reduction of oxygen present in food
- B.
Oxidation of sugar present in food
- C.
Oxidation of oil present in food
- D.
All of the above
- 10.
The following reactions is an example of- A.
Redox reaction
- B.
Electrolytic decomposition
- C.
Thermal decomposition
- D.
Photolytic decomposition
Questions: 10 | Attempts: 14511 | Last updated: Mar 22, 2022
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Sample QuestionWhat are the two types of pure substances?
Questions: 10 | Attempts: 11388 | Last updated: Sep 6, 2022
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Sample QuestionPH paper is put in a solution, which turns red. What is this?
Questions: 10 | Attempts: 6761 | Last updated: Mar 21, 2022
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Sample QuestionThere are __ required sections on a safety data sheet:
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