which one of the given is incorrect? 1) acids turns blue litmus paper red. 2) aqueous solution of acid conduct electricity. 3) acid react with certain metals to form hydrogen gas.4) none of these.
Answers
Answer:
B)Aqueous solution of acid conduct electricity
Explanation:
All acid solutions, whether organic acids or mineral acids, conduct electricity.
Reason : An acid may be defined as a substance which release one or more H+
ions in aqueous solution.On the basis of their source acids are of two types :
1) Organic Acids : Acids which are present in animals and plants are known as organic acids.
Example - Acetic acid , Lactic acid , Oxalic acid and Formic acid etc.
Note : In general organic acids are weak acids and these are weakly ionised in water.
2) Mineral Acids : Acids which are obtained from rocks and minerals are known as mineral acids.
Example - Hydrochloric acid , Sulphuric acid and Nitric acid etc.
Note : Mineral acids are strong acids and these are completely ionised in water.
One of the property of acids are :
Acid solution are electrolyte,i.e., they conduct electricity : As acids produce the hydrogen ion when dissolve in water.These ion, when in water, act as charge carriers and hence can conduct electricity.
As we know, stronger acids(mineral acids) dissociate completely and produce more of the ions and hence, conduct electricity more strongly, while weak acids(organic acids) would conduct electricity more weakly.
Answer:
The correct answer is 4) none of these.
Explanation:
Option 4) is the correct answer because,
1. In litmus paper test, acid turns blue litmus paper red.
2. Acid dissociates into ions in aqueous solution. The migration of movements helps in conducting electricity. Thus, aqueous solution of acid conduct electricity.
3. Acid reacts with metal to form salt and hydrogen gas.
For eg, HCl+Zn→H₂+ ZnCl₂
All the given statement are true.
Therefore, the correct answer is 4) none of these.