Question

Which statement about the elements in Group I is correct?
a. Hydrogen is evolved when they react with water.
b. Ions of Group I elements have a –1 charge.
c. Sodium is more reactive than potassium.
d. Solid sodium is a poor electrical conductor.

Answer 1

Answer:

A)

Explanation:

A) group-1 metal + water = metal hydroxide + hydrogen gas

B) ions of grp-1 have a charge of +1

C) reactivity increases down the grp, so K is more reactive than Na

D) like every other metals grp-1 metals are also a good conductor of electricity

Answer 2

Answer:

Option A is correct: Hydrogen is evolved when they react with water.

Explanation:

Group 1 elements in the periodic table are known as Alkali metals. The members of this group are Hydrogen (H), Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).

• Alkali metals react with water to form basic hydroxides and evolve hydrogen gas.
• They are highly electropositive in nature, thus bearing +1 charge.
• It is easy to remove electrons from sodium, thus potassium is more reactive.
• Solid sodium lacks free electrons due to which it can not conduct electricity.

Therefore, from the above discussion, it is clear that option A is correct.