Q16 of 44 Page 1

Which one of the following processes involve chemical reactions?

During a chemical reaction the chemical composition of a substance changes. A chemical reaction produces a new substance with new properties. Energy is either released or absorbed during a chemical reaction. It is an irreversible reaction.


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

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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?

 17

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

 18

Which of the following are combination reactions?