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NCERT Class X Science Class: Chapter β 1. Chemical Reactions and Equations β Part-3
Question 11:
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
Answer: B
Question 12:
Which of the following is/are an endothermic processes?
- Dilution of sulphuric acid
- Sublimation of dry ice
- Condensation of water vapours
- Evaporation of water
- (i) and (iii)
- (ii) only
- (iii) only
- (ii) and (iv)
Answer: D
Question 13:
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
- Lead sulphate (insoluble)
- Lead acetate
- Ammonium nitrate
- Potassium sulphate
Answer: B
Lead sulphate being insoluble will not dissociate into ions.
Question 14:
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
- Carbon dioxide or oxygen
- Nitrogen or oxygen
- Carbon dioxide or helium
- Helium or nitrogen
Answer: D
Question 15:
The following reaction is used for the preparation of oxygen gas in the laboratory
Which of the following statements is/are correct about the reaction?
- It is a decomposition reaction and endothermic in nature
- It is a combination reaction
- It is a decomposition reaction and accompanied by release of heat
- It is a photochemical decomposition reaction and exothermic in nature
Answer: A
Question 16:
Which one of the following processes involve chemical reactions?
- Storing of oxygen gas under pressure in a gas cylinder
- Liquefaction of air
- Keeping petrol in a china dish in the open
- Heating copper wire in presence of air at high temperature
Answer: D