﻿ Solubility product of PbCl2 at 298 K is 1 x 10-6. At this tempera

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# 11.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

C.

(0.25 x 10-6)1/3

KSP = (S) (2S)2

1 x 10-6 = 4S3

S = ${\left(\frac{1}{4}×{10}^{-6}\right)}^{1/3}$ = (0.25 x 10-6)1/3

Therefore, temperature solubility of PbCl2 in mol/L is (0.25 x 10-6)1/3

12.

The pH of a 0.001 M solution of HCl is

• 0

• 3

• 5

• 10

13.

The set representing the correct order for first ionisation potential is

• K > Na > Li

• Be > Mg > Ca

• B > C > N

• Ge > Si > C

14.

The hybridisation state of carbon in fullerene is

• sp

• sp2

• sp3

• sp3d

15.

A fruity smell is produced by the reaction of C2H5OH with

• CH3COCH3

• CH3COOH

• PCl5

• CH3CHO

16.

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

• HCHO

• HCOOH

• HCHO and HCOOH

• HCHO and CO2

17.

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

19.

Bleaching powder is obtained by treating Cl2 with

• Ca(OH)2

• CaO

• CaCO3

• CaCl2

20.

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

• 2.5

• 3

• 5

• 7.5