If a substance loses oxygen during a reaction, it is said to be
Oxidised
Reversed
Reduced
Irreversed
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
When copper powder is heated it gets coated with-
Black copper oxide
Yellow copper oxide
Red copper oxide
None of these
In the reaction
2FeCl2 + Cl2 → 2FeCl3
Chlorine may be regarded as
An oxidising agent
A reducing agent
A catalyst
Providing an inert medium
In the equation
NaOH + HNO3 → NaNO3 + H2O nitric acid is acting as
An acid
A nitrating agent
A dehydrating agent
Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a
Combination reaction
Double displacement reaction
Decomposition reaction
Displacement reaction
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
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
The equation
Cu + XHNO3 → Cu(NO3)2 + YNO2 + 2H2O the values of X and Y are
3 and 1
8 and 6
4 and 2
7 and 1 respectively
Which of the statements about the reaction below are incorrect?
2PbO (s) + C (s) → 2Pb (s) + CO2 (g)
(i) Lead is getting reduced.
(ii) Carbon dioxide is getting oxidised
(iii) Carbon is getting oxidised
(iv) Lead oxide is getting reduced
(i) and (ii)
(i) and (iii)
(i), (ii) and (iii)
All of these
