A solution of _____________ is used for white washing walls.
Slaked lime
Soda lime
Soda ash
Caustic potash
An acid which can decolourise purple coloured potassium permanganate solution is:
sulphuric acid
citric acid
carbonic acid
hydrochloric acid
The chemical reaction between quicklime and water is characterised by:
evolution of hydrogen gas
formation of slaked lime precipitate
change in temperature of mixture
change in colour of the product
What happens when dilute hydrochloric acid is added to iron fillings?
Hydrogen gas and iron chloride are produced.
Chlorine gas and iron hydroxide are produced.
No reaction takes place
Iron salt and water are produced
Which of the following reactions will not take place?
Zn + FeSO4 → ZnSO4 + Fe
2Kl + Cl2 → 2KCl + I2
Zn + MgSO4 → ZnSO4 + Mg
Mg + CuSO4 → MgSO4 + Cu
Which of the following does not involve a chemical reaction?
digestion of food in our body
process of respiration
burning of candle wax when heated
melting of candle wax on heating
Which of the following is not a balanced equation?
Ca(HO)2 + CO2 → CaCO3 + H2O
Fe + CuSO4 → FeSO4 + CU
Cu + 2HNO3 → Cu(NO3)2 + 2NO2 + H2O.
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of
A combination reaction
A displacement reaction
A decomposition reaction
A double decomposition reaction
In the equation
NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as
An oxidising agent
An acid
A nitrating agent
A dehydrating agent
Which of the following is not an endothermic reaction?
CaCO3 → CaO + CO2
2H2O → 2H2 + O2
6CO2 + 6H2O → C6H12O6 + 6O2
C6H12O6 + 6O2 → 6CO2 + 6H2O
