Solubility product of PbCl₂ at 298 K is 1 x 10^-6. At this temperature solubility of PbCl₂ in mol/L is

• (1 x 10^-6)^1/2

• (1 x 10^-6)^1/3

• (0.25 x 10^-6)^1/3

• (2.5 x 10^-6)^1/2

The pH of a 0.001 M solution of HCl is

• 0

• 3

• 5

• 10

The set representing the correct order for first ionisation potential is

• K > Na > Li

• Be > Mg > Ca

• B > C > N

• Ge > Si > C

The hybridisation state of carbon in fullerene is

• sp

• sp²

• sp³

• sp³d

A fruity smell is produced by the reaction of C₂H₅OH with

• CH₃COCH₃

• CH₃COOH

• PCl₅

• CH₃CHO

When dihydroxy acetone reacts with HIO₄, the product is/ are

• HCHO

• HCOOH

• HCHO and HCOOH

• HCHO and CO₂

Plaster of paris is

• CaSO₄.$\frac{1}{2}$H₂O

• CaSO₄.2H₂O

• CaSO₄.H₂O

• CaSO₄.4H₂O

18.

Heavy water is

• CaSO₄

• water contain CaSO₄, MgSO₄

• D₂O

• water contain CaCO₃

Bleaching powder is obtained by treating Cl₂ with

• Ca(OH)₂

• CaO

• CaCO₃

• CaCl₂

The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is

• 2.5

• 3

• 5

• 7.5