Among the following alkaline earth metal halides, the one which is covalent and soluble in organic solvents is:

1. Magnesium chloride

2. Beryllium chloride

3. Calcium chloride

4. Strontium chloride

The structures of beryllium chloride in solid-state, and vapor state are :

1. Dimer, and Linear, respectively.

2. Chain in both.

3. Chain, and dimer, respectively.

4. Linear in both.

A solid compound 'X' on heating gives CO₂ gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO₂ through 'Y' in water, a clear solution, 'Z' is obtained. On boiling 'Z', compound 'X' is reformed. The compound 'X' is:

1. ${\mathrm{CaCO}}_3$

2. ${\mathrm{Na}}_2{\mathrm{CO}}_3$

3. ${\mathrm{K}}_2{\mathrm{CO}}_3$

4. $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. 

The substance A, B, C and D, respectively are:
1.  K, $H_2$, NaOH, Zn
2.  Na, NaOH, $H_2$ , Zn
3.  Li, $H_2$, LiOH, Zn
4.  None of the above

Match List I with List II for the composition of substances and select the correct answer using the code given below:

Code :

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

Among the following which one has the highest cation to anion size ratio?

1. CsF

2. LiF

3. NaF

4. CsI

Identify the correct statement from the following:

LiF is sparingly soluble in water because it has:

1. partial covalent character.
2. small electronegativity.
3. high lattice enthalpy.
4. low hydration enthalpy.