You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of:
potassium chloride
potassium nitride
potassium sulphide
potassium iodide
An acid which can decolourise purple coloured potassium permanganate solution is:
sulphuric acid
citric acid
carbonic acid
hydrochloric acid
When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen.
2Pb(NO3)2 → 2PbO + 4NO2 + O2
The reaction is an example of
Combination reaction
Decomposition reaction
Double decomposition reaction
Displacement reaction
Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a
Double displacement 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
The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
potassium dichromate solution and sulphur dioxide
potassium permanganate solution and sulphur dioxide
potassium permanganate solution and lemon juice
potassium dichromate solution and carbon dioxide
In the reaction
2FeCl2 + Cl2 → 2FeCl3
Chlorine may be regarded as
An oxidising agent
A reducing agent
A catalyst
Providing an inert medium
When copper powder is heated it gets coated with-
Black copper oxide
Yellow copper oxide
Red copper oxide
None of these
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
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