An acid which can decolourise purple coloured potassium permanganate solution is:
sulphuric acid
citric acid
carbonic acid
hydrochloric acid
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
Which of the following is not an endothermic reaction?
CaCO3 → CaO + CO2
2H2O → 2H2 + O2
6CO2 + 6H2O → C6H12O6 + 6O2
C6H12O6 + 6O2 → 6CO2 + 6H2O
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
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
_____________ burns with a dazzling white flame and changes into a white powder.
Magnesium ribbon
Phosphorous
Camphor
Filter paper
The reaction 2Na + Cl2 → 2NaCl is an example of
Combination reaction
Decomposition reaction
Displacement reaction
Double decomposition reaction
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is known as:
law of conservation of momentum
law of conservation of mass
law of conservation of motion
law of conservation of magnetism
In the equation
NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as
An oxidising agent
An acid
A nitrating agent
A dehydrating agent
