Question

40. Answer the following questions:
(1) Give scientific reason : Platinum, gold and silver are used to make jewellery.
(2) Complete the following chemical reactions and balance it:
(a) A1,0, + HCL →
(b) MnO, +Al →​

Answer 1

Q. Answer the following questions:

(1) Give scientific reason : Platinum, gold and silver are used to make jewelry.

Answer: Platinum, gold and silver are used to make jewellery because the metals used in jewellery are always be chosen on the basis of its reactivity. They are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.

(2) Complete the following chemical reactions and balance it:

(a) A1,0, + HCL →

(b) MnO, +Al →​

Answer: Sorry don't know

Answer 2

MnO, +Al → Mno2 + Al = MN + Al2O3