Consider the following statements regarding pH value,

1. Plants and animals are pH sensitive as they survive within the pH range of 7.0 to 7.8.

2. Human blood has pH value 7.36-7.42.

3. A change in pH of blood by 0.2 units results in death.

Which of the statement(s) given above is/are correct?

Consider the following statements,

1. The mixture of helium and oxygen is used for artificial breathing of asthma patient.

2. Solution of$\frac{Kl}{I2}$ is used in the treatment of goitre.

Which of the statement(s) given above is/are correct?

Consider the following statements about calcium:

1. It forms basic oxide with air.

2. It floats over water.

3. It replaces sodium from sodium chloride.

The incorrect statement(s) is/are: