CBSE Class 7 Science Acids Bases And Salts Worksheet Set 03

Question 1: Acids are sour–can you name two acids that you can actually eat to enjoy the sour taste?
Answer : In our daily diet, we usually have lactic acid from curd and citric acid from oranges, lemons to enjoy the sour taste

Question 2: Why are acids not stored in metal containers?
Answer : Acids are corrosive in nature. They can react with metals and corrode them, that's why acids are not stored in metal containers.

Question 3: Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?
Answer :  Phenolphthalein and methyl orange are the two substances which have a different colour in acidic and basic solutions. Phenolphthalein shows colourless in acidic and pink in basic solution. Methyl orange shows red in acidic and pink in basic solution. They both are commonly known as the indicator:

Question 4: In which reaction of acids is their acidic nature cancelled out to produce a neutral substance? What is the neutral substance called?
Answer :  When acids react with bases, their acidic nature is cancelled out. This type of reaction is called a neutralization reaction. The reaction of acids and bases produces a neutral substance known as 'salt'.

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