Question 40
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with ${\text{HNO}}_3$, hydrogen is not liberated. Why?

Q.

Question 40
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with ${\text{HNO}}_3$, hydrogen is not liberated. Why?

Q. Generally, pure metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except $Mn$ and $Mg$)?

Q. Question 7
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals, except $\text{Mn}$ and $\text{Mg}$?

(a) ${\text{H}}_2{\text{SO}}_4$
(b) $\text{HCl}$
(c) ${\text{HNO}}_3$
(d) All of these

Q. When a metal carbonate is treated with dilute hydrochloric acid, the gas liberated is:

Q. Generally metals reacts with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except $Mn$ and $Mg$)?