CBSE
Multiple Choice QuestionsWhich of the following metal carbonates decomposes on heating?
MgCO3
Na2CO3
K2CO3
Rb2CO3
Among CaH2, BeH2, BaH2, the order of ionic character is
BeH2< CaH2<BaH2
CaH2<BeH2<BaH2
BaH2<BeH2<CaH2
BeH2 < BaH2 < CaH2
The correct order of the mobility of the alkali metal ions in aqueous solution is:
Li+>Na+ > K+ > Rb+
Na+>K+ > Rb+ > Li+
K+ > Rb+ >Na+ > Li+
K+ > Rb+ >Na+ > Li+
When excess of NaOH solution is added to aqueous solution of iodine, the colour of solution becomes
blue
yellow
colourless
pale green
Which of the following is the correct order of stability for the given superoxides?
KO2 < RbO2 < CsO2
CsO2 < RbO2<KO2
RbO2
KO2 < CsO2 <RbO2
Which of the following oxides is most acidic in nature?
MgO
BeO
CaO
BaO
Which of the following compounds has the lowest melting point?
CaBr2
Cal2
CaF2
CaCl2
The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrieds decreases in which of the following orders?
CsH > RbH > KH > NaH >LiH
KH > NaH> LiH > CsH >RbH
NaH > LiH >KH> RbH> CsH
NaH > LiH >KH> RbH> CsH
The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is:
BeCO3 < MgCO3 < K2CO3 <CaCO3
BeCO3 < MgCO3 < CaCO3 <K2CO3
MgCO3 < BeCO3 < CaCO3 < K2CO3
MgCO3 < BeCO3 < CaCO3 < K2CO3
In which of the following the hydration energy is higher than the lattice energy?
BaSO4
MgSO4
RaSO4
RaSO4
