JEE Main Level Ques

Self explanatory. Share ques which you think are of Main level and has a high probability of coming in Main (Even if you’re preparing for advanced then too you’re free to post some adv ques which might come in Main too)

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A piece of ice is floating on water at 4°C in a beaker. When the ice melts completely the level of water in the beaker will

  • Rise
  • Fall
  • Remain Same
  • Unpredictable

0 voters

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ice melt krke 4° C ka water bnega ya 0 °C ka ? :roll_eyes:
usse farq pd skta h shyd…

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Given solution:

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Hmmm… Shi tha logic fir… Haa… Shi h thoda beech ka temperature ajayega

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Ans : 2.4

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ideally 3 moles of d react with 4moles of e
so 9 moles d require 12 moles e
but 14 moles e require 3.583 moles d
so d is limiting reagent
now 3 moles d give ideally 5 moles C
so 9 moles give 15 moles C with 80% yield
so 0.815 moles =12 moles of c obtained
in C and G since 3 moles C require 5 moles G so 12 C would need 20G
so G is limiting reagent
4 moles G give (0.5 * 4
(6))/5 = 2.4 moles B

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Simply,

C = (5 x 9 x 0.8)/3 = 12 [ C Is Limiting Reagent In 1st Chemical Reaction

B = (6 x 4 x 0.5)/5 = 2.4 moles Ans ( D is Limiting Reagent in 2nd Chemical Reaction)

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Ans

A

y=mx + a/m for first parabola
y = mx - bm^2 for second parabola
compare the constant terms [ i.e —> a/m = (-bm^2) ]
you will get ans A

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Ans : a,d

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ans-A

reason-amine inversion resulting in racemic mix

doubt- can inversion take place in option B as well??

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No it does not occur in B (not enough energy at room temp)

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Thanks :+1: :smiley:

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Ans : a

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Ans : a

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image conceptual ques
ans : a

1 Like

1 Like


Ans : 160/3