Pupil

Q.

Explain why Lead carbonate does not react with dilute HCl?

Q.

Heating of a sugar is a __________change.

Q.

A solution of _______ when reacts with crushed egg-shells, gives a gas that turns lime-water milky.

1. $NaCl$

2. $HCl$

3. $LiCl$

4. $KCl$

Q. Which part of a hearing aid converts sound waves into electrical signals?

1. Microphone
2. Speaker
3. Battery
4. Amplifier