331.

Alkali metals have negative reduction potential and hence they behave as

• oxidising agents

• Lewis bases

• reducing agents

• electrolytes

The s-block element used as a catalyst in the manufacture of Buna-S rubber is

• Ca

• Ba

• Na

• Mg

When limestone is heated, CO₂ is given off. The metallurgical operation is

• smelting

• reduction

• calcination

• roasting

On heating potassium permanganate, one of the following compound is not obtained.

• O₂

• MnO

• MnO₂

• K₂MnO₄

Plaster of Paris is represented as

• CaSO₄·2H₂O

• CaSO₄

• CaSO₄·H₂O

• CaSO₄·$\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$

Plaster of Paris is a white powder of formula :

• ${\mathrm{CaSO}}_4.\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$

• CaSO₄.2H₂O

• CaSO₄.H₂O

• CaSO₄.$\frac{3}{2}$H₂O

CaC₂ + N₂ → A, product A is

• CaCN₂

• CaCN₂ and C

• CaCN₂ + N₂

• None of these

Calcium formate on distillation gives :

• HCOOH

• CH₃COOH

• CH₃CHO

• HCHO

Baking powder contains :

• NaHCO₃, Ca(H₂PO₂)₂ and starch.

• NaHCO₃, Ca(H₂PO₂)₂ 

• NaHCO₃ and starch.

• NaHCO₃

Estimation of calcium and magnesium is done by:

• EDTA

• oxalate

• phosphate

• none of these