An acid must contain mainly one atom which reacts with the metal to produce a gas.

What type of acid is found in curd?

What is the pH value of sodium hydroxide?

Herbs- The decomposition of vegetables into compost is an example of which reaction?

On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer?

What type of chemical reaction is combustion of natural gas?

In the following questions, select the number which will come in place of the question mark.

A series is given below. In which a letter pair is not given. Choose the correct alternative from the given ones that will complete the series.
ML, RQ, WV, BA ?