CBSE
Multiple Choice QuestionsWhich of the following compounds has the lowest melting point?
CaBr2
CaI2
CaF2
CaF2
In the replacement reaction
The reaction will be most favourable if M happens to be
Na
K
Rb
Rb
On heating which of the following releases CO2 most easily?
K2CO3
Na2CO3
MgCO3
MgCO3
Property of the alkaline earth metals that increases with their atomic number
the solubility of their hydroxides in water
the solubility of their sulphates in water
ionisation energy
ionisation energy
In the case of alkali metals, the covalent character decreases in the order
MCl> MI>MBr>MF
MF> MCl> MBr>MI
MF > MCl> MI>MBr
MF > MCl> MI>MBr
What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?
-5.1 eV
-10.2 eV
+2.55 eV
+2.55 eV
Match (I) with list (II) for the compositions of substances and select the correct answer using the code given below the lists.
|
|
List I (substance) |
|
List II Composition |
|
A. |
Plaster of Paris |
1. |
CaSO4.2H2O |
|
B. |
Epsomite |
2. |
CaSO4. ½ H2O |
|
C. |
Kieserite |
3. |
MgSO4. 7H2O |
|
D. |
Gypsum |
4. 5. |
MgSO4.H2O CaSO4 |
|
A |
B |
C |
D |
|
3 |
4 |
1 |
2 |
|
A |
B |
C |
D |
|
2 |
3 |
4 |
1 |
|
A |
B |
C |
D |
|
1 |
2 |
3 |
5 |
|
A |
B |
C |
D |
|
1 |
2 |
3 |
5 |
Which one of the alkali metals, forms only the normal oxide, M2O on heating in air?
Rb
K
Li
Li
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
CaSO4
BeSO4
BaSO4
BaSO4
Which one of the following is present as an active ingredient in bleaching powder for bleaching action?
Ca(OCl)2
CaO2Cl
CaCl2
CaCl2
