In this section you will find thousands of questions of Chemistry, how to solve each of the questions and the correct answer.
You will have four options in each question, try to answer correctly and if you don't, you will have the option to see the solution or choose another answer.
If you want to know how to solve each question you can click on the option 'How to solve?'
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that
temperature of the milk drops as it loses heat
water vapour around the bottle gains energy from the bottle
water vapour in the air around the bottle loses energy to the bottle
the saturated vapour pressure of the milk equals the atmospheric pressure
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V), Ca(NO3)2. [Ca = 40, N = 14, O = 16]
13.1%
27.6%
8.5%
17.1%
Which of the following is an example of a mixture?
Blood
Common salt
Sand
Washing soda
An example of an oxidation–reduction enzyme is
amylase
protease
lipase
dehydrogenase
Ethanol reacts with concentrated tetraoxosulphate(VI) acid at a temperature above 170°C to form
ethanone
ethene
ethyne
ethanal
