NDA || Chemistry || Physical and Chemical Changes || Quiz 2020

Which among the following are chemical changes?

The amount of heat required to change a liquid to gaseous without any change in temperature is known as

Choose the incorrect option/options from the statements listed below when milk changes into curd?

(i) The taste remains the same.

(ii) Lactic acid is formed.

(iii) It changes colour.

(iv) The change cannot be reversed.

Which one of the following oxides dissolves in water?

When a solid is heated, it turns directly into a gas. This process is called

Which of the following substances are harmful to health if present in food items?

1) Pesticide residues

2) Lead

3) Metanil yellow

4) Mercury

Select the correct answer using the code given below :

Which one of the following gases gives acidic solution on dissolving in water?

If one mixes up ashes with animal fat, the substance received in the crude form is called

Glass is a

Brine is an aqueous solution of