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NCERT Class X Science Class: Chapter β 1. Chemical Reactions and Equations β Part-1
Multiple Choice Questions
Question 1:
Which of the following is not a physical change?
- Boiling of water to give water vapours
- Melting of ice to give water
- Dissolution of salt in water
- Combustion of Liquefied Petroleum Gas (LPG)
Answer: D
Question 2:
The following reaction is an example of a
- Displacement reaction
- Combination reaction
- Redox reaction
- Neutralisation reaction
- (i) and (iv)
- (ii) and (iii)
- (i) and (iii)
- (iii) and (iv)
Answer: C
Question 3:
Which of the following statements about the given reaction are correct?
- Iron metal is getting oxidised
- Water is getting reduced
- Water is acting as reducing agent
- Water is acting as oxidising agent
- (i) , (ii) and (iii)
- (iii) and (iv)
- (i) , (ii) and (iv)
- (ii) and (iv)
Answer: C
The substance which oxidizes the other substances in a chemical reaction is known as an oxidising agent. Likewise, the substance which reduces the other substance in a chemical reaction is known as reducing agent.
Question 4:
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)
- (i) and (ii)
- (ii) and (iii)
- (i) and (iv)
- (iii) and (iv)
Answer: A
Question 5:
Three beakers labelled as A, B and C each containing of water were taken. A small amount of , anhydrous were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement (s) is (are) correct?
- In beakers A and B, exothermic process has occurred
- In beakers A and B, endothermic process has occurred
- In beaker C exothermic process has occurred
- In beaker C endothermic process has occurred
- (i) only
- (ii) only
- (i) and (iv)
- (ii) and (iii)
Answer: C