Q14 of 44 Page 1

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

Helium or nitrogen both can be used for storage of fresh sample of an oil for a long time. These gases are called inert gases as they do not react with most elements including oxygen. Thus these gases create an inert environment for the oil and prevent its reaction with any element in the environment that prevent from getting it rancid.

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12

Which of the following is (are) an endothermic process (es)?

(i) Dilution of sulphuric acid


(ii) Sublimation of dry ice


(iii) Condensation of water vapours


(iv) Evaporation of water

 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?

 15

The following reaction is used for the preparation of oxygen gas in the laboratory:


Which of the following statements (s) is/are correct about the reaction?

 16

Which one of the following processes involve chemical reactions?