Changes Around ...

Which of the following changes can be reversed?

Which of the following statements about redox reactions is/are correct?

(i) A substance is said to be reduced if it gains oxygen during a reaction.
(ii) A substance is said to be oxidised if it gains electrons during a reaction.
(iii) A substance is said to be reduced if it loses oxygen during a reaction.
(iv) A substance is said to be reduced if it gains hydrogen during a reaction.

What is 'Z' in the given process?

Woollen yarn Z

Which of the given changes can be reversed?

Which of the following is a balanced chemical equation of the reaction between carbon monoxide gas and hydrogen gas?

Why does silver chloride turn grey in the sunlight?

The ball and the ring made up of same metal and of same diameter are used to study the effect of heat on metals.



Which of the following statements is correct?

Which of the following reactions involves a physical change?

Which of the following food items do/does not become rancid?

The characteristic feature of an oxidising agent is that it always

When a small amount of manganese dioxide is added to hydrogen peroxide, oxygen is evolved. This is an example of

In the reaction: Zn + H₂SO₄ ZnSO₄ + H₂, zinc undergoes

If the sign '' is used in a chemical reaction, what does it indicate?

Which of the following is a balanced chemical equation?

Which of the following is true for all chemical reactions?