New Concepts/Shortcuts 18

Question 1

B2H6 can be synthesized BF3 and NaBH4

true or false

Answer 1

Question 2

velocity gradient formula

Answer 2

Question 3

source of

zymase
diastase
urease
pepsin

Answer 3

Question 4

whats the CN of ZnS

Answer 4

4

Answer 5

first write the PQ equation with the direction vectors being same as given the line to be measure along

and point being the point P

then find the point in plane of that line and find PQ

Question 6

biuret test isn’t given by

Answer 6

dipeptides and free amino acids do not give biuret test.

Question 7

which vitamin contains cobalt

Answer 7

Vitamin B12

Question 8

standard reduction potential for

Cl2
I2
Ag
NA
Li

Answer 8

Question 9

average power in ac circuit cannot/can be zero.

Answer 9

average power in ac circuit can be zero.

Question 10

what forms glucose on heating with acid?

Answer 10

cellulose

Question 11

how is cane sugar converted to glucose and fructose

Answer 11

by adding invertase

Question 12

how is glucose converted to ethyl alcohol

Answer 12

by adding zymase

Question 13

how is starch converted to maltose?

Answer 13

Question 14

how is maltose converted to sugar?

Answer 14

Question 15

the urea decomposition reaction and what’s the catalyst?

Answer 15

Question 16

what work does the pepsin enzyme do and what does pancreatic trypsin do?

Answer 16

the pepsin enzyme converts proteins into peptides while in the intestine, the pancreatic trypsin converts proteins into amino acids by hydrolysis.

Question 17

eg of non polar molecular solids?

Answer 17

argon 
heluim
H2
Cl2
I2

Question 18

how are the molecules and atoms held in the solid form of H2/Cl2/I2

Answer 18

weak dispersion forces or London forces

Question 19

eg of polar molecular solids

Answer 19

HCl

SO2

Question 20

how are the molecules held in nonpolar molecular solids

Answer 20

they are held together by relatively stronger dipole-dipole interactions

Question 21

why do metals have lustre and color in them!?

Answer 21

because of free electrons in them

Question 22

whats giant molecules?

Answer 22

A wide variety of crystalline solids of non-metals result from the formation of covalent bonds between adjacent atoms throughout the crystal. They are also called giant molecules

Question 23

What’s used in rat poison?

Answer 23

sodium fluoride is used in rat poison

Question 24

What’s in bronze?

Answer 24

Cu and Sn(TIn)

Question 25

What’s in brass?

Answer 25

Copper and zinc

Question 26

what does a commercial bleaching solution contain?

Answer 26

sodium hypochlorite

Question 27

What’s used in cars for cooling engines as an antifreeze?

Answer 27

ethylene glycol, an antifreeze, is used in cars for cooling the engine

Question 28

What’s used in cars for cooling engines as an antifreeze?

Answer 28

ethylene glycol, an antifreeze, is used in cars for cooling the engine

Question 29

napthalene and anthracene dissolve readily in _________

Answer 29

naphthalene and anthracene dissolve readily in benzene but sodium chloride and sugar do not.

Question 30

polar solvents and non polar solutes dissolved in ______

Answer 30

polar solutes dissolve in polar solvents and non-polar solutes in nonpolar solvents.

Question 31

whats crystallization?

Answer 31

Some solute particles in the solution collide with the solid solute particles and get separated out from the solution. This process is known as crystallisation

Question 32

number of solute particles going into solution_____

Answer 32

a number of solute particles going into the solution will be equal to the solute particles separating out and a state of dynamic equilibrium is reached.

Question 33

solubility of gases in liquids is greatly affected by?

Answer 33

Solubility of gases in liquids is greatly affected by pressure and and temperature

Question 34

solubility of solid in liquid depends on?

Answer 34

temperature

Question 35

What’s the effect of pressure on the solubility of a solid in a liquid?

Answer 35

Pressure does not have any significant effect on the solubility of solids in liquids. It is so because solids and liquids are highly incompressible and practically remain unaffected by changes in pressure.

Question 36

What’s present in the tanks of scuba divers?

Answer 36

the tanks used by scuba divers are filled with air diluted with helium (11.7% helium, 56.2% nitrogen, and 32.1% oxygen).

Question 37

What’s the effect of temperature on the solubility of gases in liquids ?!

Answer 37

Solubility of gases in liquids decreases with rise in temperature. When dissolved, the gas molecules are present in liquid phase and the process of dissolution can be considered similar to condensation and heat is evolved in this process

Question 38

dissolution is an exothermic process or an endothermic?

Answer 38

As dissolution is an exothermic process, the solubility should decrease with increase of temperature

Question 39

What’s the scene of vapor phase in equilibrium?!

Answer 39

at equilibrium vapor phase will be always rich in the component which is more volatile

Question 40

vapor phase mole fraction formula?

Answer 40