Which gas changes damp litmus paper from red to blue?

In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?

Which ion, in aqueous solution, forms a white precipitate when dilute sulfuric acid is added?

A metallic ion in aqueous solution produces

(i) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

(ii) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

What is the metallic ion?

Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could X be?

A salt is dissolved in water. The results of two separate tests on it are shown in the table.

1. white precipitate which dissolved when excess aqueous ammonia is added.
2. white precipitate is formed when dilute nitric acid and aqueous barium nitrate is added to the salt solution. What is the salt?

A colourless gas with a pungent odour turns blue litmus paper red and turns filter paper dipped in acidified potassium dichromate from orange to green.

This gas is

A solution of iron(II) sulfate is added until in excess to a solution of barium nitrate. The precipitate produced is filtered off and water is added to the residue in the filter paper.

The colour of the precipitate produced is

A compound when treated with concentrated hydrochloric acid gives off a greenish-yellow gas which bleached moist red litmus paper.

The compound is MOST likely to be

Which of the following observations is likely when EXCESS aqueous ammonia is added to a solution of copper(II) sulfate and the mixture is shaken?

Which cation gives a green precipitate with NaOH?

We can distinguish between Sodium chloride and Sodium nitrate by using .........