Q5 of 28 Page 187

When crystals of lead nitrate on heating strongly produces _________ gas and the colour of the gas is _________.

Nitrogen dioxide(NO2), reddish brown

Lead nitrate on heating strongly decomposes or undergoes a decomposition reaction to produce lead oxide , nitrogen dioxide and oxygen. It is this nitrogen dioxide gas which is being produced during the reaction which is evolved and is reddish brown in colour.


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3

A student tests the pH of pure water using a pH paper. It shows green colour. If a pH paper is used after adding lemon juice to water, what colour will he observe?

(Green / Red / Yellow)

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Chemical volcano is an example of _________.

(combination reaction / decomposition reaction)

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When aqueous solution of silver nitrate and sodium chloride are mixed, _______ precipitate is immediately formed (white / yellow / red).

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Aluminium can displace Zinc metal from aqueous solution of Zinc sulphate because______

(zinc is more reactive than aluminium / aluminium is more reactive than zinc).