Question

Match the column:
Column A Column B
(i) Light green amorphous powder A. CuSO₄.⋅ 5H₂O
(ii) White crystalline solid B. I₂
(iii) Blue crystalline solid C. Na₂CO₃ .10H₂O
(iv) Violet crystalline solid D. (NH₄)₂Cr₂O₇
(v) Orange red crystalline solid E. CuCO₃

Answer 1

Columns are matched below -

(i) Light green amorphous powder -

CuCO₃/ copper carbonate

(ii) White crystalline solid - Na₂CO₃ .10H₂O/ sodium carbonate

(iii) Blue crystalline solid - CuSO₄.5H₂O/ copper sulphate pentahydrate

(iv) Violet crystalline solid - Iodine crystals

(v) Orange red crystalline solid - (NH₄)₂Cr₂O₇/ ammonium dichromate.

•Colour in chemicals comes, due to excitation of electrons.

•Electrons in elements, absorb energy, and excite to higher energy levels. •They absorb some wavelength.

•This is the reason for colour chemical compounds.