Question

Dichromate ions posses their maximum absorbance at 450 nm which is orange in color. But upon dilution, maximum absorbance occurs at 410 nm. Why??​

Answer 1

When dil. Sulphuric acid is added to sodium carbonate and heated, a colourless, odourless gas is evolved. This gas is CO

2

. When CO

2

is passed through lime water, it turns like water milky due to the formation of calcium carbonate. Also this gas doesn't show any effect when passed through K

2

Cr

2

solution.