Question

Match the columns.
Column A Column B
(i) Nessler’s reagent A. Cl₂
(ii) Greenish yellow gas with pungent choking odour B. H₂
(iii) Gas that burns with pale blue flame C. CuCO₃
(iii) Orange Solid D. K₂HgI₄
(iv) Light green powder E. (NH₄)₂Cr₂O₇

Answer 1

Matching column A with column B :

i) Nessler’s reagent - K₂[HgI₄]

• Nessler's reagent is the common name for potassium tetraiodomercurate (II).

• It is used as a reagent to test the presence of ammonium ions in a compound.

ii) Greenish yellow gas with pungent choking odour - Cl₂

• Chlorine gas is recognized by its greenish-yellow colour and a pungent irritating odour.

iii) Gas that burns with pale blue flame - H₂

• Hydrogen gas is highly combustible and burns in the presence of oxygen with a pale blue flame.

iv) Orange Solid - (NH₄)₂Cr₂O₇

• Ammonium dichromate is an orange inorganic salt composed of ammonium cations and dichromate anions.

v) Light green powder - CuCO₃

• Copper carbonate is a green inorganic amorphous solid made of copper cations and carbonate anions.