CBSE
Multiple Choice QuestionsKMnO4 in alkaline medium changes to
Mn3+
MnO2
MnO
Mn(OH)
Bleaching powder does not contain
CaCl2
Ca(OH)2
Ca(OCl)2
Ca(ClO3)2
Assertion : BeSO4 is soluble in water while BasO4 is not.
Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following has highest hydration energy?
MgCl2
CaCl2
BaCl2
SrCl2
The temporary hardness of water due to calcium bicarbonate can be removed by adding :
CaCO3
Ca(OH)2
CaCl2
HCl
The first ionisation enthalpy of Na, Mg and Si are 496, 737, 776 kJ/mol respectively. What will be the first ionisation enthalpy potential of Al in kJ/mol?
> 766 kJ/ mol
> 496 and < 737 kJ
>737 and < 766 kJ/mol
>496 kJ/mol
Which of the following reactions produces hydrogen?
Mg + H2O
H2S2O8 + H2O
BaO2 + HCl
Na2O2 + 2HCl
Which one does not form oxide on heating ?
ZnCO3
CaCO3
Li2CO3
Na2CO3
Potassium nitrate is called :
Mohr's salt
Chile salt petre
Indian salt petre
Gypsum
When NaCl is dissolved in water , the sodium ions becomes :
oxidised
reduced
hydrolysed
hydrated
