Science true or false.[1 Mark each]

False
Correct statement:
During electrolysis, hydrogen and oxygen are obtained in the ratio 2:1.

True.

True.

False
Correct statement:
Temporary and permanent hardness both can be removed by the method of distillation.

True.

Soap lathers well in hard water- false.
Correct statement:
Soap lathers well in soft water.

The density of water will not change at all temperature-false.
Correct statement:
Water suitable for drinking is called potable water.

Excessive use of chemical fertilizers depletes the soil and causes water pollution- true.

Sea water is suitable for irrigation as it contains dissolved salts- false.
Correct statement:
Sea water is not suitable for irrigation as it has high salinity.

Sewage should be treated well before being discharged it into water bodies- true.