NDA || Science || Chemistry || Quiz

The phosphorus used in the manufacture of safety matches is

Which one of the following is not a chemical change?

One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars emit various pollutants which are bad for human health when inhaled, like

1) Nitrogen oxides ( NO_x)

2) Carbon monoxide (CO)

3) Carbon dioxide (CO₂)

4) Benzene

Which of the above pollutants are not tolerated by human beings even at very low levels?

Soap is sodium or potassium salt of

The density of water is