Question

Metal + Dil. HCl → Metal Salt + Gas
Which of the following two combinations are incorrect?
Metal Gas Evolved
(i) Aluminium Yes
(ii) Copper Yes
(iii) Magnesium Yes
(iv) Zinc No
a. i and iii b. i and iv c. ii and iii d. ii and iv

Answer 1

Answer:

here only copper can't displace hydrogen ion, becoz copper is less reactive than hydrogen

Answer 2

When a metal reacts with dilute hydrochloric acid, gas is released. This is correct for aluminum, copper, magnesium, and zinc metals. The equations are incorrect for the combinations ii and iv. (OPTION D)

Explanation

REACTIVITY SERIES -

• The series in which elements are arranged in the decreasing order of their reactivity.
• The most reactive metals react with water, steam, and acids and release hydrogen gas.
• The least reactive metals are unreactive in nature and moderately reactive do not react with water.
• The reactive metals include potassium, magnesium, aluminum, calcium, barium.
• Moderately reactive are zinc, lead, tin, chromium, cobalt, nickel, manganese.
• Least reactive are the metals placed under hydrogen that are copper, mercury, gold, silver, bismuth, antimony.
• Highly and moderately reactive metals react with dilute acid to form metal salt with the evolution of gas.
• Copper is unreactive and zinc is moderately reactive and releases hydrogen gas on reaction with hydrochloric acid.