Q.No: 1. Marble is ........... .
1. Calcium Oxide.
2. Calcium hydroxide
3. Calcium carbonate
4. Calcium sulphate
Q.No: 2. ANSWER FROM IMAGE

1. ANSWER 1
2. ANSWER 2
3. ANSWER 3
4. ANSWER 4
Q.No: 3. When lead nitrate reacts with potassium iodide ........Colour precipitate is formed.
1. White colour
2. Yellow colour
3. pink colour
4. grey colour
Q.No: 4. A single product is formed from two or more reactants is known as a ........... reaction.
1. endothermic reaction
2. exothermic reaction
3. combination reaction
4. decomposition reaction
Q.No: 5. The starting chemical substance in a chemical reaction is called as a......
1. products
2. catalyst
3. reactants
4. substance
Q.No: 6. The reaction of hydrogen gas with oxygen gas to form water is an example of
1. combination reaction
2. redox reaction
3. exothermic reaction
4. all of these reactions
Q.No: 7. When a magnesium ribbon is burnt in air, the ash formed is
1. black colour
2. white colour
3. yellow colour
4. pink colour
Q.No: 8. Burning of coal is a ........reaction.
1. displacement reaction
2. oxidation reaction
3. combination reaction
4. decomposition reaction
Q.No: 9. Balanced chemical equation must obey the....
1. law of constant proportion
2. law of momentum
3. law of conservation of mass
4. Dalton's law
Q.No: 10. Which of the following is not a physical change?
1. Boiling of water to give water vapour
2. Melting of ice to give water
3. Dissolution of salt water
4. Combustion of liquefied Petroleum Gas (LPG)
Q.No: 11. Release of heat energy in a chemical reaction is called as.....
1. endothermic reaction
2. exothermic reactions
3. combination reaction
4. decomposition reaction
Q.No: 12. Hydrogen gas is.........
1. colourless,odourless
2. foul smelling gas
3. rotten smelling gas
4. coloured
Q.No: 13. The new substance formed by the reactants in a chemical reaction is called as....... .
1. products
2. catalyst
3. reactants
4. substance
Q.No: 14. Which information is not conveyed by a balanced chemical equation?
1. Physical states of reactants and products.
2. Symbols and formulae of all the substances involved in a particular reactio
3. Number of atoms/molecules of the reactants and products formed
4. Whether a particular reaction is actually feasible or not
Q.No: 15. Combination reactions are ....... in nature.
1. endothermic reaction
2. exothermic reactions
3. redox reaction
4. decomposition reaction
Q.No: 16. Zinc + Sulphuric acid -->.......+ Hydrogen
1. Zinc chloride
2. Zinc sulphate
3. Zinc nitrate
4. Zinc oxide
Q.No: 17. When lead nitrate reacts with potassium iodide ,the precipitate formed is......... .
1. Lead oxide
2. Lead iodide
3. potassium sulphate
4. potassium nitrate
Q.No: 18. Mass of the reactants is always equal to the mass of the products.This statement proves....... .
1. law of constant proportion
2. law of momentum
3. law of conservation of mass
4. Dalton's law
Q.No: 19. A chemical change in a substance is called as a ....... .
1. chemical equation
2. chemical reaction
3. balanced chemical equation
4. balanced chemical reaction
Q.No: 20. The method of balancing chemical equations is called ........ .
1. Trial method
2. Hit method
3. Hit and trial method
4. Coefficient method
Q.No: 21. Slaked lime is .......
1. Calcium Oxide
2. Calcium hydroxide
3. Calcium carbonate
4. Calcium sulphate
Q.No: 22. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
1. The surface of metal becomes shining
2. The reaction mixture turns milky
3. Odour of a pungent smelling gas is recorded
4. A colourless and odourless gas is evolved
Q.No: 23. When magnesium burns with oxygen,it produces a............Colour flame.
1. fluoresence
2. dazzling white
3. dazzling blue
4. purple
Q.No: 24. Which of the following observations help(s) us to determine that a chemical change has taken place?
1. Change in temperature
2. Evolution of gas
3. change in colour
4. All of these
Q.No: 25. ANSWER FROM IMAGE

1. ANSWER 1
2. ANSWER 2
3. ANSWER 3
4. ANSWER 4
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