Question

Q2. Four experimental set-up are shown below. A rapid evolution of H2 gas will be observed in which setup. DA We wir (11) A. Fig (a)
B. Fig (b)
C. Fig (c)
D. Fig (d) ​

Answer 1

Answer:

Zn+H2SO4(conc)----->ZnSO4+H2↑

SO,NO A

Answer 2

In Fig (a), we will observe a rapid evolution of hydrogen gas.

• Reaction in setup 1 =

        Zn + 2 HCl -> ZnCl₂ + H₂

• Zinc is more reactive than Hydrogen, hence it replaces H from its solution.
• The presence of hydrogen gas can be detected by lightning a matchstick. In presence of hydrogen gas, it burns with a pop sound.

• In setup b, c, and d, metals magnesium, copper and platinum react with dilute HCl respectively.
• All these metals are incapable of reacting with acids to evolve hydrogen gas.