Q4 of 28 Page 187

Chemical volcano is an example of _________.

(combination reaction / decomposition reaction)

decomposition reaction

The phenomena of chemical volcano occurs when ammonium dichromate decomposes at a very high temperature. At very high temperature ammonium dichromate decomposes into green vapours which is then evolved along with the steam produced during the course of the reaction. This evolution of green vapours along with the steam gives an image as that of a volcanic eruption and hence known as chemical volcano.


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2

A reddish brown coloured element ‘X’ on heating in air, becomes a black coloured compound ‘Y’. X and Y are______ and ________(Cu, CuO / Pb, PbO).

 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)

 5

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

 6

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