Science
Consider the following compounds :
FeSO4; CuSO4; CaSO4; Na2CO3
The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :
options
- FeSO4
- CuSO4
- CaSO4
- Na2CO3
Answer
Na2CO3
Reason — Among the given salts their common crystalline hydrates are :
- Ferrous sulphate heptahydrate (FeSO4·7H2O),
- Copper sulphate pentahydrate (CuSO4·5H2O),
- Gypsum/Calcium sulphate dihydrate (CaSO4·2H2O), and
- Washing soda/Sodium carbonate decahydrate (Na2CO3·10H2O).
Since 10 > 7 > 5 > 2, sodium carbonate (Na2CO3·10H2O) contains the largest number of water molecules per formula unit.
Related Questions
A metal and a non-metal that exists in liquid state at the room temperature are respectively:
options
- Bromine and Mercury
- Mercury and Iodine
- Mercury and Bromine
- Iodine and Mercury
Carbon compounds :
(a) are good conductors of electricity.
(b) are bad conductors of electricity.
(c) have strong forces of attraction between their molecules.
(d) have weak forces of attraction between their molecules.
The correct statements are:
options
- (a) and (b)
- (b) and (c)
- (b) and (d)
- (a) and (c)
Oxides of aluminium and zinc are:
options
- Acidic
- Basic
- Amphoteric
- Neutral
The reaction given below is a redox reaction because in this case :
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
options
- MnO2 is oxidised and HCl is reduced.
- HCl is oxidised.
- MnO2 is reduced.
- MnO2 is reduced and HCl is oxidised.