Give reasons for the following :
a. Tooth pastes are used to prevent tooth decay.
b. Adding baking powder to cake makes it spongy and soft.
c. Dry hydrogen chloride gas does not change the colour of the litmus paper
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a. Tooth pastes are used to prevent tooth decay bcoz acid is present in the mouth which leads to tooth decay and tooth paste has base in its composition which neutralises the effect of acid.
b. Bcoz after heating Baking soda it releases CO2 gas which make the cake spongy and soft and also pluffy.
c. Bcoz the colour of litmus paper is changed by H + ions because of acid. Dry HCL does not dissociate to give H+ ions. Acids dissociate to give ions only when they are in aqueous solution. In this HCL is not in aqueous form nor the litmus paper is wet, so the colour of litmus paper does not change.
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