Question

Zinc reacts with $dil.{{H}_{2}}S{{O}_{4}}$ to give ${{H}_{2}}$. It also reacts with $conc.{{H}_{2}}S{{O}_{4}}$ to give $S{{O}_{2}}$.
If true enter $1$, else enter $0$.

Answer 1

Hint: The basic difference between dilute and concentrated acids is that the dilute acid has some amount of water content in it while in case of concentrated acids, it's just pure acid, meaning, it only contains the molecules of that specific acid.
Metals upon reaction with acids, produce salt of that acid along with some side products.

Complete step by step answer:
In the question we are provided with two reactions and asked if these reactions are true or not. So, in order to find out the answer, we must first write the chemical equations with the provided information and see what happens.
At the first reaction we can see that zinc is supposed to react with dilute sulphuric acid in order to give hydrogen gas, so, the reaction can be chemically expressed as,
$Zn+dil.{{H}_{2}}S{{O}_{4}}\to ZnS{{O}_{4}}+{{H}_{2}}$
So the zinc reacts with dilute sulphuric acid in order to form zinc sulphate and hydrogen gas. So the first part of the statement came out to be true. Now we will look at the next part, where concentrated sulphuric acid is supposed to react with zinc in order to give sulphur dioxide as a product. This equation can be chemically expressed as,
$Zn+conc.2{{H}_{2}}S{{O}_{4}}\to ZnS{{O}_{4}}+2{{H}_{2}}O+S{{O}_{2}}$
We can see that the zinc metal upon reaction with the concentrated sulphuric acid, gave zinc sulphate along with sulphur dioxide and water. And we can see that one of the products of the reaction is in fact sulphur dioxide. So the second part of the given statement is also true.

So, the correct answer for the following question which is most appropriate would be, $1$.

Note: Zinc on reaction with dilute sulphuric acid, produces hydrogen gas along with zinc sulphate while on the other hand, it produces sulphur dioxide along with water and zinc sulphate when reacted with concentrated sulphuric acid.
In this reaction, the metal which is zinc, actually dissolves in the acid, which produces the salt along with the side products.
The hydrogen gas which is produced in this reaction, could be tested by bringing a burning candle near the mouth of the test tube, as it would create a ‘popping’ sound while burning.