The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through an aqueous solution of B. C is solid. Solid C on gentle heating gives back A. The compound A is:
1. Na2CO3
2. K2CO3
3. CaSO4.2H2O
4. CaCO3
In replacement reaction
The reaction will be most favorable if M happens to be:
1. K
2. Rb
3. Li
4. Na
Match List I with List II for the composition of substances and select the correct answer using the code given below:
List-I Substances |
List-II |
(A) Plaster of paris | (i) CaSO4. 2HO |
(B) Epsomite | (ii) CaSO4.½H2O |
(C) Kieserite | (iii) MgSO4.7H2O |
(D) Gypsum | (iv) MgSO4.H2O |
(v) CaSO4 |
Code :
(A) | (B) | (C) | (D) | |
1. | (iv) | (iii) | (ii) | (i) |
2. | (iii) | (iv) | (i) | (ii) |
3. | (ii) | (iii) | (iv) | (i) |
4. | (i) | (ii) | (iii) | (v) |
Among the following which one has the highest cation to anion size ratio?
1. CsF
2. LiF
3. NaF
4. CsI
The correct order of the mobility of the alkali metal ions in aqueous solution is:
1.
2.
3.
4.
The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3, and BeCO3 is:
1.
2.
3.
4.
1. CsH > RbH > KH > NaH > LiH
2. KH > NaH > LiH > CsH > RbH
3. NaH > LiH > KH > RbH > CsH
4. LiH > NaH > KH > RbH > CsH
In the case of alkali metals, the covalent character decreases in the order:
1. MCl>Ml>MBr>MF
2. MF>MCl>MBr>Ml
3. MF>MCl>Ml>MBr
4. Ml>MBr>MCl>MF