CBSE X Science Chemical Reactions

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#1. What is the name of substance which does get deposited over iron because of moisture present in air?

Oxygen

Rust

Sulphide

Carbonate

#2. What happens when hydrogen reacts with oxygen?

All of the above

Hydrogen carbonate is formed

Carbon dioxide is formed

Water is formed

#3. Which of the following is termed as rancidity?

Oxidation of sugar present in food

Oxidation of oil present in food

Reduction of oxygen present in food

All of the above

#4. What happens when silver bromide is exposed to sunlight?

Bromine gas is formed

Hydrogen gas is formed

Iodine gas is formed

Chlorine gas is formed

#5. What is the name of reaction, which decomposes after supply of heat?

Thermal decomposition

Displacement reaction

Combination reaction

Redox reaction

#6. What is the another name of quick lime?

Calcium oxide

Calcium hydroxide

Sodium oxide

Carbon dioxide

#7. Which of the following product is formed after heating of limestone?

Hydrogen gas

Calcium oxide

Calcium carbonate

All of the above

#8. Which of the following gas is produced when carbon is burnt in air?

Carbon dioxide

Sulphur dioxide

Hydrogen

Oxygen

#9. Which of the following does show oxidation reaction?

Gain of hydrogen

Gain of oxygen

Loss of oxygen

None of the above

#10. Which of the following does show reduction reaction?

None of the above

Gain of oxygen

Loss of hydrogen

Loss of oxygen

#11. Which of the following is formed when lead nitrate is put under thermal decomposition?

All of the above

Lead oxide

Nitrogen dioxide

Oxygen gas

#12. Which of the following is termed as exothermic reaction?

Reaction in which there is loss of oxygen

Reaction in which there is gain of hydrogen

Reaction in which heat is evolved

Reaction in which heat is absorbed

#13. What is the chemical name for slaked lime?

Calcium oxide

Carbon monoxide

Calcium hydroxide

Calcium carbonate

#14. Which of the reaction is used in black and white photography?

Oxidation reaction

Combination reaction

Decomposition reaction

Displacement reaction

#15. Heating of ferrous sulphate gives which of the following product?

Sulphur dioxide

Sulphur trioxide

Ferric oxide

All of the above

#16. What happens when carbon dioxide is passed in lime water?

Lime water turns milky because of formation of water

Lime water turns red because of formation of copper sulphate

Lime water turns milky because of formation of calcium carbonate

Lime water turns red because of formation permanganate

#17. Which of the following is formed when lead nitrate is put under thermal decomposition?

All of the above

Lead oxide

Oxygen gas

Nitrogen dioxide

#18. Which of the following does denote chemical reaction take place?

Evolution of heat

Change of state

Reversible reaction

Formation of new product

#19. Which of the following is termed as endothermic reaction?

Reaction in which there is loss of oxygen

Reaction in which heat is absorbed

Reaction in which heat is evolved

Reaction in which there is gain of hydrogen

#20. What is the name of reaction in which both oxidation and reduction takes place?

Combination reaction

Redox reaction

Thermal decomposition

Displacement reaction

#21. In which of the following heat is evolved?

Double displacement reaction

Decomposition reaction

Displacement reaction

Combination reaction

#22. What happens when Copper metal is dipped in the solution of zinc sulphate?

Zinc metal is separated

Copper sulphate is formed

Oxygen gas is formed

No reaction takes place

#23. Which of the following termed as reducing agent?

Which removes oxygen

All of the above

Which removes hydrogen

Which gives oxygen

#24. Which of the reaction is used in black and white photography?

Decomposition reaction

Combination reaction

Displacement reaction

Oxidation reaction

#25. Which of the following is termed as oxidizing agent?

Which gives oxygen

All of the above

Which gives hydrogen

Which removes oxygen

finish

Results

#1. What is the name of substance which does get deposited over iron because of moisture present in air?

#2. What happens when hydrogen reacts with oxygen?

#3. Which of the following is termed as rancidity?

#4. What happens when silver bromide is exposed to sunlight?

#5. What is the name of reaction, which decomposes after supply of heat?

#6. What is the another name of quick lime?

#7. Which of the following product is formed after heating of limestone?

#8. Which of the following gas is produced when carbon is burnt in air?

#9. Which of the following does show oxidation reaction?

#10. Which of the following does show reduction reaction?

#11. Which of the following is formed when lead nitrate is put under thermal decomposition?

#12. Which of the following is termed as exothermic reaction?

#13. What is the chemical name for slaked lime?

#14. Which of the reaction is used in black and white photography?

#15. Heating of ferrous sulphate gives which of the following product?

#16. What happens when carbon dioxide is passed in lime water?

#17. Which of the following is formed when lead nitrate is put under thermal decomposition?

#18. Which of the following does denote chemical reaction take place?

#19. Which of the following is termed as endothermic reaction?

#20. What is the name of reaction in which both oxidation and reduction takes place?

#21. In which of the following heat is evolved?

#22. What happens when Copper metal is dipped in the solution of zinc sulphate?

#23. Which of the following termed as reducing agent?

#24. Which of the reaction is used in black and white photography?

#25. Which of the following is termed as oxidizing agent?

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