Question

Galvanisation is applying a coating of
(a) Cr
(b) Cu
(c) Zn
(d) Pb
Which of the following atoms has the highest first ionisation energy?
(a) Na
(b) K
(c) Sc
(d) Rb​

Answer 1

1st Answer:

Option (c) Zn

Explanation:

Zinc metal is the most stable metal to cover iron surfaces. The process of coating the iron surface with zinc is called galvanization.

2nd Answer:

Option (c) Sc

Explanation:

Order of first ionisation energy Sc > Na > K > Rb.

Due to the poor shielding effect, removal of one electron from 4s orbital is difficult as compared to 3s-orbital.

Answer 2

Answer:

✯ Choose the correct options :-

❶ Galvanisation is applying a coating of :

(a) Cr

(b) Cu

(c) Zn

(d) Pb

Answer :

➳ Galvanisation is applying a coating of (c) Zn [Zinc] .

EXPLANATION :-

$\dashrightarrow$ Galvanisation is applying a coating of zinc.

$\dashrightarrow$ Zinc is used to prevent rusting of iron.

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❷ Which of the following atoms has the highest first ionisation energy ?

(a) Na

(b) K

(c) Sc

(d) Rb

Answer :

➳ (c) Sc [Scandium] has the highest first ionisation energy.

EXPLANATION :-

$\dashrightarrow$ Scandium (Sc) has the highest first ionisation energy.

$\dashrightarrow$ Because, by going down the group, ionisation energy decease, and again moving across the period ionisation energy increase.