In context with beryllium, which one of the following statements is incorrect ?

(a)

It is rendered passive by nitric acid

(b)

It forms Be₂C

(c)

Its salts are rarely hydrolysed

(d)

Its hydride is electron deficient and polymeric

A colourless solid substance (A) on heating evolved CO₂ and also gave a white residue, soluble in water. Residue also gave CO₂ when treated with dilute HCI ___________

(a)

Na₂CO₃

(b)

NaHCO₃

(c)

CaCO₃

(d)

Ca(HCO₃)₂

Which of the following statement is false ?

(a)

Ca²⁺ ions are not important in maintaining the regular beating of the heart

(b)

Mg²⁺ ions are important in the green parts of the plants

(c)

Mg²⁺ ions form a complex with ATP

(d)

Ca²⁺ ions are important in blood clotting

Formula of Gypsum is _______________

(a)

CaSO₄.2H₂O

(b)

CaSO₄·1/2 H₂O.

(c)

3CaSO₄.H₂O

(d)

2CaSO₄.2H₂O

Among the following the least thermally stable is ___________

(a)

K₂CO₃

(b)

Na₂CO₃

(c)

BaCO₃

(d)

Li₂CO₃