Chemistry
Four reactions are shown below in the diagram:
Which reactions produce water?
- 1 and 2
- 1 and 3
- 3 and 4
- 2 and 3
Answer
3 and 4
Reason — Reaction 3 shows burning of ethanol, which is an example of combustion and combustion produces water and carbon dioxide. Reaction 4 has dilute sulphuric acid and magnesium carbonate, a reaction of acid and carbonate produces salt, water and carbon dioxide. Hence, reaction 3 and reaction 4 produces water.
Related Questions
Assertion (A): Aqueous solution of potassium chloride can conduct electricity.
Reason (B): Conduction of electric current is due to the presence of free ions.
- (A) is true and (R) is false.
- (A) is false and (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
Identify the ion that contain one lone pair of electrons.
- OH-1
- H3O+
- NH4+
- H+
When compound X reacts with dilute sulphuric acid, it releases a gas that turns acidified potassium dichromate solution from orange to green. Which of the following could be compound X?
- Lead nitrate
- Copper carbonate
- Sodium chloride
- Potassium sulphite
The volume occupied by 2 moles of a gas at STP is:
- 22.4L
- 2.24L
- 44.8L
- 4.48L