${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ on heating (below 200 degrees celsius) liberates a gas. The same gas will be obtained below 600 degrees celsius by :

1. Heating ${\mathrm{NH}}_4{\mathrm{NO}}_2$

2. Heating ${\mathrm{NH}}_4{\mathrm{NO}}_3$

3. Heating ${\mathrm{Mg}}_3{\mathrm{N}}_2$

4. None of the above

The incorrect statement among the following is : 

1. The atomic radius of Na is greater than that of Mg.

2. Density of K is more than Na.

3. Melting point & boiling point of Ca are greater than those of Mg.

4. Mg does not react with cold water.

A Brine solution on electrolysis will not give : 

1.  NaOH

2.  ${\mathrm{Cl}}_2$

3.  ${\mathrm{H}}_2$

4.  ${\mathrm{O}}_2$

Out of Be, Mg, Ca, Sr and Ba,

Total number of metal whose nitrates are decomposed according to the following reaction are:

2M(NO₃)₂ $\stackrel{∆}{\to }$ Residue + 4NO₂ + O₂

1. 5

2. 4

3. 3

4. 2

 An amphoteric hydroxide among the following is : 

1.  $\mathrm{Be}{\left(\mathrm{OH}\right)}_2$

2.  $\mathrm{Sr}{\left(\mathrm{OH}\right)}_2$

3.  $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4.  $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is :

1. ${\mathrm{BeCO}}_3<{\mathrm{MgCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3<{\mathrm{CaCO}}_3$

2. ${\mathrm{BeCO}}_3<{\mathrm{MgCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3$

3. ${\mathrm{MgCO}}_3<{\mathrm{BeCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{K}}_2{\mathrm{CO}}_3$

4. ${\mathrm{K}}_2{\mathrm{CO}}_3<{\mathrm{MgCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{BeCO}}_3$

HCl was passed through a solution of CaCl₂, MgCl₂, and NaCl. Compound(s) that get crystallize is/are-

1. Only NaCl

2. Only MgCl₂

3. NaCl, MgCl₂, and CaCl₂

4. Both MgCl₂ and CaCl₂

The incorrect statement among the following is -

1. Li⁺ has minimum degree of hydration among alkali metal cations.

2. The oxidation state of K in KO₂ is +1

3. Sodium is used to make Na / Pb alloy.

4. MgSO₄ is readily soluble in water.

The incorrect statement among the following is- 

1. Sodium metal is used in organic qualitative analysis.

2. Sodium carbonate is soluble in water and it is used in inorganic qualitative analysis.

3. Potassium carbonate can be prepared by the solvay process.

4. Aq. solution of potassium bicarbonate is a weak base.