Question

1.
A white crystalline salt on heating produces a crackling sound and gives a colourless,
odourless
gas
which
supports combustion followed by evolution of a reddish brown gas
with pungent smell. A yellow solid is left behind after the reaction. Identify the salt and
write a balanced chemical equation for the reaction
and in the formation of

Answer 1

Answer:

Lead nitrate is the white crystalline salt. When it is heated, it makes a crackling noise and produces 2 gases NO2 & NO3. The colour of NO2 gas is reddish-brown.

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Answer 2

Lead nitrate is the white crystalline salt

Explanation:

Lead nitrate is the white crystalline salt. When it is heated, it makes a crackling noise and produces 2 gases NO2 & NO3. The color of NO2 gas is reddish-brown. And the precipitate is yellow lead oxide.

Pb($(NO_{3})_{2}$) →  PbO + $NO_{2}$ + $NO_{3}$

When the crystals are heated, they lose the water, which becomes vapor and cracks the salt crystals as it escapes. Decrepitation is the noise produced when certain chemical compounds are heated, or it refers to the cracking or breaking-up of lumps. Another example of Decrepitation is when the bigger crystals of sodium chloride break up into smaller ones.