New Concepts/Shortcuts 2

Question 1

what should be the approach to solve the collision problems in 2D kinematics

Answer 1

ALWAYS START WITH RELATIVE CONCEPT

Question 2

what can we infer from this statement

Answer 2

the P(x) is a quadratic polynomial

Question 3

column tube is open/closed tube

Answer 3

closed tube

Question 4

what to do if we have diameter/radius given of the reso tube

Answer 4

consider the end correction

Question 5

what do we do with the error of correction in resonance tubes calculation

Answer 5

add it to the length of the tube and use it normally in the formulae!

eg:

Question 6

what’s the formula for end correction of reso tube and how do we apply it for open and closed tube

Answer 6

e=0.6r

for open tube: l+2e

for closed tube: l+e

Question 7

potential difference of silicon diodes and germanium diodes

Answer 7

Silicon Diodes:- 0.7 V

Germanium Diodes :- 0.3 V

Question 8

roots of this?

Answer 8

Question 9

whats the lens formula for this type of lens

Answer 9

we can use this for different number of lens in a similar way

Question 10

what kind of approach can be taken in these types of q

Answer 10

sub a=b=c and such valid substitution of the variables to make it easier

Question 11

(a) II is more reactive than I.
(b) I is more reactive than II
(c) Both have same reactivity.
(d) None of these

Answer 11

B

since its harder to break D-D bonds

Question 12

where would NO2 be attached?

Answer 12

meta position as CF3 is highly electron withdrawing grpq

Question 13

what does germanium silver contaings?

Answer 13

Cu, Zn and Ni

Question 14

NH3 is a strong/weak field ligand

Answer 14

strong field ligand

Question 15

how are Ni2+ identified

Answer 15

The identification of Ni2+ is carried out by dimethyl glyoxime in the presence of NH2OH.

Question 16

dimethyl glyoxime(DMG) is charged/neutral

Answer 16

neutral

Question 17

n factor of oxalic acid

Answer 17

2

Question 18

what kind of metla s can be used as electrodes

Answer 18

metals with low IE are used as electrodes

Question 19

hydroformylation reaction?

Answer 19

Question 20

In diatomic molecule the rotational energy at a given temperature obeys Maxwell’s distribution is
false/true

Answer 20

True

Question 21

the formula for rotational energy of a molecule in KTG

Answer 21

R.E= f/2 Kb T

f—> the number of rotational degree of motion

monoatomic—-> 0
diatomic—–> 2
polyatomic—–> 3

Question 22

In a ferromagnetic material, below the Curie

temperature, a domain is defined as

Answer 22

a macroscopic region with saturation

magnetisation

Question 23

what to generally do if we have to find minimum value of a function

Answer 23

if nothing much workds out! go for AM>GM

Question 24

newtons method for quadratic question where we have a10, a8 such huge numbers to be found in expressions

Answer 24

Question 25

the graph of P.E. for Sn1 reaction is?

Question 26

why is salicyclic acid very stable and why is COOH not on para position

Answer 26

becuase COOH on ortho posotion makes H bonds with the OH and hence forms a much more stable compound

Question 27

t BuOna is what?

Answer 27

a bulky base used in elimination or sub and generally forms anti markovnikov product as its very bulky

Question 28

where is bromine water used for practical organic chem?

Answer 28

bromine water is used to identify a double bond in a HC

if its the bromine water decolourised, there is a double bond in the compound

Question 29

reactivity series

Answer 29

Li K Ba Sr Ca Na Mg Al Mn Zn Cr Fe Cd Co Ni Sn Pb H2 Cu Hg Ag Au Pt

Question 30

basic strength order of amines if R=CH3

Answer 30

Question 31

acidic strength is indirectly/directly proportional to O.S of elements

Answer 31

O.S. of the elements

for chloro,sulphur, nitrogen oxoacids

Question 32

acidic order of oxoacids of P(H2PO3,H3PO2,H3PO4)

Answer 32

Question 33

how to draw these types of graph

Answer 33

first, draw a normal graph! then while it’s increasing, within a given range! the max value will keep increasing! therefore we will keep the same graph while increasing but while decreasing the max vale within that range will be the earlier max value which was already attainted therefore we would keep the graph constant from there

Question 34

between two masses, how much minimum energy to give to a mass to travel from one mass surface to the other !?

What’s the approach!?

Answer 34

apply energy conservation at the place where the force on the mass due to the big two masses is equal

and hence after that a little push, it will go to the other mass

Question 35

the vitamins list

Answer 35

Question 36

tangent of a circle formula

Answer 36

Question 37

tangent of parabola

Answer 37

Question 38

normal of parabola

Answer 38

Question 39

normal of ellipse

Answer 39

Question 40

tangents of ellipse

Answer 40