WorksheetsWater
Total questions: 17
Worksheet time: 9mins
Water is a compound as:
its properties are different from its individual elements
it can be separated by physical methods
it does not have constituents in a fixed proportion
its formula is H2O
A salt has a solubility of 59 g at a particular temperature. A solution of 50 g of the salt at that temperature will be a/an:
saturated solution
unsaturated solution
supersaturated solution
carbonated solution
The number of molecules of water of crystallisation in Blue vitriol is:
4
5
3
7
When blue vitriol is heated gently:
it sublimes
it turns green
it evaporates
it turns white
FeSO4.7H2O is also called:
blue vitriol
green vitriol
glauber's salt
epsom salt
A liquid drying and dehydrating agent is:
dilute H2SO4
concentrated H2SO4
anhydrous CaCl2
silica gel
A salt whose solubility increases with temperature is:
NaCl
Na2SO4
KNO3
CaSO4
A salt that shows a break in the solubility curve is:
KNO3
CaSO4
Na2SO4.10H2O
Ca(OH)2
Deliquescence means:
losing moisture
absorbing moisture and becoming a liquid
losing water of crystallisation
absorbing moisture without changing state
C6H12O6 --> 6C + 6H2O
This equation shows the reaction of:
dehydration
drying
synthesis
displacement
Epsom salt and Green vitriol are:
pentahydrate
hexahydrate
heptahydrate
decahydrate
Glauber's salt and Washing soda are:
heptahydrate
hexahydrate
pentahydrate
decahydrate
Temporary hardness is due to:
bicarbonates of sodium
bicarbonates of magnesium and calcium
sulphates and chlorides of sodium
sulphates and chlorides of calcium and magnesium
Permanent hardness is due to:
chlorides and sulphates of sodium and potassium
chlorides and sulphates of calcium and magnesium
bicarbonates of calcium and magnesium
bicarbonates of sodium and potassium
Permanent hardness can be removed by:
boiling
addition of washing soda
both
Temporary hardness can be removed by:
boiling
addition of washing soda
both
A salt whose solubility decreases with temperature is:
NaCl
Na2SO4
KNO3
CaSO4
