Ammonia is prepared by the Haber process. In this process, N₂ reacts with H₂ in the presence of catalyst iron. In this process, which metal is used as a promoter of catalyst iron?

Consider the following statements regarding enzyme catalysis:

1. The rates of enzymatic reactions are very much affected by pH change.

2. Enzyme catalysts are not specific in their reactions.

Which of the statements given above is/are incorrect?

Which of the following statements is/are true?

1. Pure water does not conduct electricity because it is almost unionised.

2. When iron rusts, its weight increases.

3. A chemical reaction becomes faster at a higher temperature.

4. At higher temperatures, molecular motion becomes more rapid.

Choose the correct option: