Physical and Ch...

Mg + O₂ 'X'
'X' + H₂O 'Y'
What are 'X' and 'Y' in the above two reactions?

While working in a lab, Mary dropped a blade in a solution of copper sulphate. She observed a change in the colour of the solution from

Complete the following reaction:

Copper sulphate solution + Iron ? + Copper

Which gas appears as bubbles on addition of vinegar in baking soda?

Iron is coated with a layer of ________ to protect it from rusting.

Ships suffer a lot of damage because of rusting. Which of the following helps in slowing down the rusting of ships?

Which of the following features is not related to a physical change?

Which of the following processes is not a chemical change?

The presence of ______ prevents the rusting of iron.

Which of the following is the standard test for carbon dioxide?

When carbon dioxide is passed through limewater, it turns milky due to the formation of

Which of the following is not a chemical change?

Which of the following statements is/are false?

a. Charring of sugar into charcoal by strong heating is a physical change.
b. New medicines are produced by a chain of chemical reactions.
c. Formation of curd is an example of a chemical change.

Consider the following reaction:
2KClO₃ 2KCl + O₂
In this reaction, potassium chlorate gives potassium chloride and oxygen. How many atoms of oxygen are present in the reactant of the given reaction?

Soft drinks contain carbon dioxide and hydrogen. Why are they sour in taste when neither hydrogen nor carbon dioxide is sour?