HI

2021-05-22 07:45:20 Important conversions

To remember



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𝐅𝐎𝐑 𝐌𝐎𝐑𝐄 𝐂𝐎𝐍𝐓𝐄𝐍𝐓
𝐉𝐎𝐈𝐍

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NOTE - DON'T SHARE WHITHOUT CREDITS Open / Comment

2021-05-22 06:06:30 For solution, refer:-

https://www.melvano.com/post/6121=46

https://t.me/joinchat/RJaGE2pRwUq3ua0J Open / Comment

2021-05-21 18:15:34 SURFACE CHEMISTRY TRICKS

#TRICKS
#KEEPUNMUTED
#IMPORTANT

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𝐅𝐎𝐑 𝐌𝐎𝐑𝐄 𝐂𝐎𝐍𝐓𝐄𝐍𝐓
𝐉𝐎𝐈𝐍

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2021-05-21 16:34:07 ARE UR BASICS OF ORGANIC WEAK?

HERE is the the super trick to solve Inductive Effect Questions under 30 sec

MUST WATCH THIS VIDEO









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2021-05-21 16:16:27 Important SCIENCE (CHEMISTRY )

. Gases used in welding are ?
– Acetylene & Oxygen

Gases used by sea divers for breathing are ?
– Oxygen & Helium

. Best sources for Vitamin D are?
– Sunlight & Fish liver

Zinc Phosphide is used as?
– Rat Poison

. Fuse wire is made up of
– Lead and Tin

Purest form of Iron is?
– Wrought Iron

Radium is extracted from .
– Pitchblende

Which agent is as ‘seed’ in artificial rain?
– Silver Iodide

. Oxides of metals are .
– Alkaline

During the process of ‘rusting’ , the weight of iron .
–Increases

(metal) is liquid at room temperature.
– Mercury

What is the formula of common salt
– NaCl

. What is the maximum number of electrons that a p-orbital can hold
– 6

. What is used in fire extinguisher
– Sodium bicarbonate

What is the nature of metal oxides
– Basic

. Which gas burns with popping sound
– Hydrogen

Which metal is used for galvanization
– Zinc

. What is the nature of bleaching powder
– Oxidising agent

Which is stored in Kerosene
– Sodium

Phenolphthalein gives which color in acidic medium
– Colorless

Which gas is used in cigarette lighters?
– Butane

. Biogas chiefly contains .
– Methane

. Chemical used as fixer in Photography is .
– Sodium thiosulphate

Aspirin is
– Acetyl Salicylic Acid

is also known as ‘Stranger Gas.’
– Xenon

Natural rubber is a polymer derived from .
– Isoprene Open / Comment

2021-05-21 15:31:24 Open / Comment

2021-05-21 14:31:42 LOGIC GATES NOTES


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𝐅𝐎𝐑 𝐌𝐎𝐑𝐄 𝐂𝐎𝐍𝐓𝐄𝐍𝐓
𝐉𝐎𝐈𝐍

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2021-05-21 11:29:42 Periodic Table Chemistry Tricks -

Group 1 - Lina Kare Rab Se Fariyad
Elements - Li, Na, K, Rb, Cs, Fr

Group 2 - Beta Mange Cars Saari Baap Roye
Elements - Be, Mg, Ca, Sr, Ba, Ra

Group 13 - Bengan, Aaloo, Gazar In Thella
Elements - B, Al, Ga, In, Tl

Group 14 - Chemistry Sir Gives Sanki Problems.
Elements - C, Si, Ge, Sn, Pb

Group 15 - Nepal Pakistan Australia Sab Bikhari (No offence!!)
Elements - N, P, As, Sb, Bi

Group 16 - Old Style Se Tepo
Elements - O, S, Se, Te, Po

Group 17 - Fir Call kar Bahaar AayI Aunty
Elements - F, Cl, Br, I, At

Group 18 - Heena Neena Aur Kareena Xenath Rangeen
Elements - He, Ne, Ar, Kr, Xe, Rn

D blocks elements -

Esi TV Corporation Mange Fir raha hein, Koi Ni Kuch nahi Janta
Elements - Sc, T, V, Cr, Mn, Fe, Co, Ni, Cu, Zn

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𝐅𝐎𝐑 𝐌𝐎𝐑𝐄 𝐂𝐎𝐍𝐓𝐄𝐍𝐓
𝐉𝐎𝐈𝐍

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2021-05-21 08:19:59 Revision Notes on Flow of Liquids and Viscosity (3/3)


Modified formula, η = [η0AT1/2]/[1+(S/T)]

(b) Effect of pressure:- At low pressure, co-efficient of viscosity of a gas varies directly with pressure.

Rate of flow of liquid through a liquid through a capillary tube of radius r and length l,

V= πpr4/8ηl = p/(8ηl/ πr4) = p/R

Here p is the pressure difference between two ends of the capillary and R is the fluid resistance.

Accelerated fluid containers:- tan θ = ax/g

If W be the weight of a body and U be the up thrust force of the liquid on the body then,

(a) The body sinks in the liquid of W>U

(b) The body floats just completely immersed if W=U

Pressure exerted by a column of liquid of height h:- P = hρg

Here, ρ is the density of liquid.

Pressure at a point within the liquid:-

P = P0 +hρg

Here, P0 is the atmospheric pressure and h is the depth of point with respect to free surface of liquid.

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𝐅𝐎𝐑 𝐌𝐎𝐑𝐄 𝐂𝐎𝐍𝐓𝐄𝐍𝐓
𝐉𝐎𝐈𝐍

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