EASY
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A light-sensitive compound 'X' of silver is used in black and white photography. On exposure to sunlight, its colour changes to grey. This is reaction.

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Important Questions on Chemical reactions and Equations

HARD

Write the balanced chemical equations for the chemical reaction; lead nitrate is heated. How can we confirm by the observation that these chemical reaction is taking place? 

MEDIUM
When ferrous sulphate is heated strongly it decomposes to form
MEDIUM

Complete the given chemical reaction: 

CuSO4aq+Fes_____ +_____.

Name the type of reaction. 

EASY

Taking into consideration the relationship in the first pair, complete the second pair: 

2H2+O22H2O: Combination reaction: 2HgO2Hg+O2: _____.

MEDIUM

The reaction of iron nail with copper sulphate solution is _____ reaction. 

EASY
What happens when Mercuric Oxide is heated.(write only chemical equation)
MEDIUM

Answer the following:

In the chemical reaction given below:

Question Image

Name the substance which is reduced?

MEDIUM
Ferrous sulphate decomposes with the evolution of gas having characteristics odour of burning sulphur. Identify the type of reaction.
MEDIUM

Which of the following reaction does not takes place? State the reason.

(i) FeSO4 + Mg MgSO4 + Fe  

(ii) ZnSO4 + Cu CuSO4 + Zn 

MEDIUM
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light, and electricity.
MEDIUM
The electrolysis of acidified water is an example of: 
EASY

The reaction of the iron nail with copper sulphate solution is a _____ reaction. 

EASY
Two chemical mixed by the laboratory assistant in the laboratory are Barium chloride and potassium sulphate. Write a balanced Chemical Equation for the above reaction.
MEDIUM

Answer the following:

In the chemical reaction given below:

ZnO+C  Zn+CO

Identify the oxidising agent.

 

MEDIUM
Name the brown fumes liberated when lead nitrate is heated. Write the balanced chemical equation for this reaction.
EASY
On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed.
(a) Identify the type of reaction and the gas X.
(b) Write balanced chemical equation of the reaction.
(c) Write the pH range of aqueous solution of the gas X.
MEDIUM
The colour of NO2 and PbO formed when lead nitrate is heated are: