Question

6. A chemical compound ‘ X ’ on heating produces brown coloured pungent odoured gas ‘ Y ’. a. Name the substances X and Y b. Write a balanced chemical equation for the reaction. c. Name the type reaction

Answer 1

Answer:

The compound X is lead nitrate, on heating it produces brown colored gas that is nitrogen dioxide (Y).  The reaction type is decomposition reaction

Explanation:

Lead nitrate crystals on strong heating decompose to form lead monoxide, brown colored nitrogen dioxide gas and oxygen gas.

2Pb(NO3)2 (s)--- ->  2PbO (s) + 4 NO2 (g)  + O2 (g)

note this may be confused with heating of FeSO4 but heating of FeSO4 does not give colored fumes..

good luck!

Answer 2

Explanation:

Given -

• A chemical compound X on heating produces brown coloured pungent odour gas Y.

To Find -

• Name the substance X and Y
• Write a balanced chemical equation for the reaction.
• Name the type of reaction

According to the question :-

X →→heating→→ Y (Brown coloured gas)

As we know that :-

• NO2 (Nitrogen dioxide) gas has brown fumes

It means,

Pb(NO3)2 →→heating→→ PbO + NO2 + O2

Hence,

X is Pb(NO3)2

Y is NO2

Balanced Chemical equation :-

2Pb(NO3)2 →→heating→→ 2PbO + 4NO2 + O2

This is the type of decomposition reaction.

Additional information :-

Types of chemical reaction :-

• Combination reaction -

Those reaction in which two or more substances combined to form a single substance, are called combination reaction.

• Decomposition reaction -

Those reaction in which a compound splits up into two or more simpler substances are known as decomposition reaction.

• Displacement reaction -

Those reaction in which one element takes the place of another element in a compound, are known as Displacement reaction.

• Double Displacement reaction -

Those reaction in which two compounds react by an exchange of ions to form two new compounds are called double displacement reaction.