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Q3 ans : Curd and sour substances have contain acid. They would react with the surface of metal vessels such as that of brass and copper to produce harmful substances. So they are not kept in metal containers.
Answer:4. The gas that extinguishes burning candle is carbon dioxide which was formed by action of dil.hcl on metal carbonate,since one of the compound is calcium chloride the metal compound A is calcium carbonate
5.Glucose or alcohol do not ionise to produce H+ ions which are responsible for conduction of electricity
7. Acid must be always added to water slowly with constant stirring . If water is added to acid the heat generated may cause the mixture to splash out and cause burns,the glass container may also break due to excessive local heating
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