Q7) Name the following: (a) Name and colour of the product when copper (II) oxide reacts with dilute sulphuric acid. (b) Colour of the gas when calcium nitrate is heated. (c) a compound which leaves green residue on heating. (d) A salt which gives chalky white precipitate with sodium hydroxide solution.
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♡Name and colour of the product when copper♡
The black coloured substance is formed due to the reaction of Cu with air. 2) Copper reacts with oxygen present in air to form copper oxide, which is black in colour. The black substance is the copper oxide.
Reacting copper(II) oxide with sulfuric acid. In this experiment an insoluble metal oxide is reacted with a dilute acid to form a soluble salt. Copper(II) oxide, a black solid, and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution.
♡Colour of the gas when calcium nitrate is heated♡
When calcium nitrate is heated ,white colour calcium oxide is formed along with it reddish brown gas known as nitrogen dioxide is given out accompanied with oxygen gas…
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