Extra info part2

Question 1

Element showing +8 Oxidation state

Answer 1

Os

Question 2

Example of auto catalyst

Answer 2

KMnO4 vs oxalic acid titration, Mn2+ acts as catalyst. Thus rxn speeds up

Question 3

SF6 and SF4 difference in hydrolysis

Answer 3

SF6 cant be hydrolysed due to 6 big atoms preventing attack of H2O

Question 4

In chromatography, which substance is eluted first

Answer 4

Eluted means it stays in the solvent. Thus the subtsance which gets adsorbed less is eluted more.

Question 5

Why can’t C and H2 be used as reducing agents at High temp

Answer 5

They form carbide and hydride at high temp

Question 6

Role of adsorption in froth floatation process

Answer 6

pine oil is adsorbed on sulphide ore particles

Question 7

Barrier potential depends on:

Answer 7

Temp, doping concentration, forward biasing but not on diode design

Question 8

Which is better at adsorbing, true sol or colloid?

Answer 8

Colloid due to more surface area

Question 9

Alum charge

Answer 9

+ve

Question 10

gyromagnetic ratio

Answer 10

magnetic momentum/angular momentum

Question 11

Only radioactive lanthanoid

Answer 11

Promethium

Question 12

Element which does not form hydride on direct heating with H2

Answer 12

Be

Question 13

Fractional distillation which component distills out first

Answer 13

The one with lower BP

Question 14

diazosalt react with HNO2 again, we get

Answer 14

nitro benzene due to electrophilic substitution

Question 15

BP of iso isomer is always lesser than any other isomer of same no of carbons

Answer 15

True

Question 16

Thermodynamically, graphite most stable form. But does diamond convert to graphite

Answer 16

No, as Ea for conversion is very high

Question 17

Delta formation happens due to

Answer 17

coagulation