Q. Very pure hydrogen (99.9%) can be made by which of the following processes?
(1) Reaction of salt like hydrides with water
(2) Reaction of methane with steam
(3) Mixing natural hydrocarbons of high molecular weight
(4) Electrolysis of water
[AIEEE 2012]
Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...
Sol. (4) Very pure hydrogen (99.9%) can be made by electrolysis of water.
Q. In which of the following reaction $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent ?
(1) (1), (3)
(2) (2), (4)
(3) (1), (2)
(4) (3), (4)
[JEE(Main) 2014]
(1) (1), (3)
(2) (2), (4)
(3) (1), (2)
(4) (3), (4)
[JEE(Main) 2014]
Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...
Sol. (2) When $\mathrm{H}_{2} \mathrm{O}_{2}$ act as reducing agent then it evolve.
Q. Which of the following statements about $\mathrm{Na}_{2} \mathrm{O}_{2}$ is not correct ?
(1) $\mathrm{Na}_{2} \mathrm{O}_{2}$ oxidises $\mathrm{Cr}^{3+}$ to $\mathrm{CrO}_{4}^{2-}$ in acid medium
(2) It is diamagnetic in nature
(3) It is the super oxide of sodium
(4) It is a derivative of $\mathrm{H}_{2} \mathrm{O}_{2}$
[JEE(Main) 2014]
Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...
Sol. (3) $\mathrm{Na}_{2} \mathrm{O}_{2}$ is peroxide of sodium
Q. Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent in acid medium ? :-
(1) $\mathrm{MnO}_{4}^{-}$
(2) $\mathrm{SO}_{3}^{2-}$
(3) KI
(4) $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$
[JEE(Main)Online-2014]
Q. Permanent hardness in water cannot be cured by:
(1) Treatment with washing soda
(2) Calgon’s method
(3) Boiling
(4) Ion exchange method
[JEE(Main)Online-2015]
Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...
Sol. (3) Permanent hardness in water cannot cured by boiling of water
Q. From the following statements regarding H2O2, choose the incorrect statement :
(1) It has to be stored in plastic or wax lined glass bottles in dark
(2) It has to be kept away from dust
(3) It can act only as an oxidizing agent
(4) It decomposes on exposure to light
[JEE(Main)Online-2015]
Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...
Sol. (3) $\mathrm{H}_{2} \mathrm{O}_{2}$ can act as oxidizing as well as reducing agent depend on condition.
Q. Hydrogen peroxide oxidises $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}$ to $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$ in acidic medium but reduces
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$ to $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}$ in alkaline
medium. The other products formed are, respectively :
[JEE(Main)Online-2018]
(1) $\left(\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\right)$ and $\left(\mathrm{H}_{2} \mathrm{O}+\mathrm{OH}^{-}\right)$
(2) $\mathrm{H}_{2} \mathrm{O}$ and $\left(\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\right)$
(3) $\mathrm{H}_{2} \mathrm{O}$ and $\left(\mathrm{H}_{2} \mathrm{O}+\mathrm{OH}^{-}\right)$
(4) $\left(\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\right)$ and $\mathrm{H}_{2} \mathrm{O}$
Very nice website big man, my children are little shits and they actually got some fecking education done here.
Perhaps I concentrated way too much on maths !! should have thought of doing a bit of chemistry !!!
My kids love your website ahaha I’m such a proud mother.
My brotha got says he got into iit NiggerNagar from cho website and I want in too, pls help man out.
Omaigawd so useful I did these questions, became tapir and then got into iit NiggerNagar.
Omaigawd so useful I did these questions, became tapir and then got into iit NiggerNagar
waah bete waah
moj krdi
Nice Questions
bekar
lol
Nice questions
Waste simply
Need more questions
Waste questions simple
I want to fuck you all.
Still more questions
all answers are wrong great job
What’s wrong in it
hi
more question please
Need some more questions
Nope so much effective
Need some more questions for practice
Best platform , for iit jee thnku soo much this question helpful engineering entrance examination
m
I told u before need more bits till 2019 plz kindly look into this
2019 and 2020 not given
2019 questions not given
Great work indeed.