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All posts related to Science

Suraj
Shared from General Organic Chemistry on Mar 29, 2020 8:52 PM

[10] Annulenes are given below.



P, Q and R will be _____________.

 
aromatic, nonaromatic, antiaromatic
nonaromatic, aromatic, aromatic
antiaromatic, nonaromatic, aromatic
nonaromatic, nonaromatic, aromatic
aromatic, nonaromatic, aromatic
Please type your answer before submitting.
Suraj

Can please elaborate

Subarnab Sadhukhan
Shared from Electric Charges, Forces on Mar 22, 2020 8:33 PM

Two concentric conducting thin spherical shells A and B, having radii rA and rB (rB > rA), are charged to QA and - QB (|QB|>|QA|). The electrical potential along a line (passing through the centre of the shells) can be best represented as

 
Please type your answer before submitting.
Subarnab Sadhukhan

The explanation is not clear to me. How the graph line at rA and rB got straight?

Aman Jhajj
Shared from JEE Main Mock - 6 on Feb 08, 2020 2:59 PM

HBr reacts fastest with

 
2-methylpropan-1-ol
propan-1-ol
butan-1-ol
2-propanol
-
Please type your answer before submitting.
Aman Jhajj

2-methylpropan-1-ol can form tertiary cation by hydride shift so why is it not correct?

Rahul
Shared from Motion in a Straight Line (Easy) on Jan 22, 2020 3:09 PM

A gun kept on a straight horizontal road is used to hit a car travelling on the same road away from the gun at a uniform speed of 10 ms–1. The car is at a distance of 150 m from the gun when it is fired at an angle of 45° to the horizontal. What is the distance of the car from the gun when the shell hits it? (Take g = 10 m/s2)

 
250 m
750 m
500 m
1,000 m
Please type your answer before submitting.
Prerna

It is because the distance travelled by the car in time T = Range of the shell - 150 m.

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Aastha
Shared from JEE Main Mock - 1 on Dec 23, 2019 1:41 PM

Which one of the following species is not a pseudohalide?

 
CNO-
RCOO-
OCN-
NNN-
Please type your answer before submitting.
Firoz Ahmad Khan

Pseudohalides are the univalent anions (or functional groups) which form hydracids with hydrogen and form insoluble salts with Ag(Silver) such as cyanides, cyanates, isocyanates, rhodanides (i.e. thiocyanates and isothiocyanates), selenocyanogens, tellurorhodanides and azides

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