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questions
List of practice Questions
Refining using liquation method is the most suitable for metals with :
JEE Main - 2022
JEE Main
Chemistry
General Principles and Processes of Isolation of Elements
Which of the following can be used to prevent the decomposition of $H _2 O _2$ ?
JEE Main - 2022
JEE Main
Chemistry
Surface Chemistry
Reaction of
\(BeCl _2\)
with
\(LiAlH _4\)
gives: Choose the correct answer from options given below :
\(AlCl _3\)
\(BeH _2\)
\(LiH\)
\(LiCl\)
\(BeAlH _4\)
JEE Main - 2022
JEE Main
Chemistry
Chemical Kinetics
Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "$X$" with 6-equivalents of "Y". "X" and "Y", respectively are :
JEE Main - 2022
JEE Main
Chemistry
p -Block Elements
The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :
JEE Main - 2022
JEE Main
Chemistry
Alcohols, Phenols and Ethers
Which technique among the following, is most appropriate in separation of a mixture of $100\, mg$ of $p$-nitrophenol and picric acid ?
JEE Main - 2022
JEE Main
Chemistry
Organic Chemistry - Some Basic Principles and Techniques
$\dot{ C } l + CH _4 \rightarrow A + B$. $A$ and $B$ in the above atmospheric reaction step are
JEE Main - 2022
JEE Main
Chemistry
Chemical Reactions
The dark purple colour of $KMnO _4$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :
JEE Main - 2022
JEE Main
Chemistry
Redox reactions
The force required to stretch a wire of cross-section $1 cm ^2$ to double its length will be: (Given Yong's modulus of the wire $=2 \times 10^{11} N / m ^2$ )
JEE Main - 2022
JEE Main
Physics
mechanical properties of solids
If the radius of earth shrinks by $2 \%$ while its mass remains same The acceleration due to gravity on the earth's surface will approximately :
JEE Main - 2022
JEE Main
Physics
Gravitation
During the denaturation of proteins, which of these structures will remain intact ?
JEE Main - 2022
JEE Main
Chemistry
Biomolecules
The photochemical smog does not generally contain :
JEE Main - 2022
JEE Main
Chemistry
Environmental Chemistry
Choose the correct order of density of the alkali metals :
JEE Main - 2022
JEE Main
Chemistry
GROUP 1 ELEMENTS
The compound(s) that is(are) removed as slag during the extraction of copper is :
\(CaO\)
\(FeO\)
\(Al _2 O _3\)
\(ZnO\)
\(NiO\)
Choose the correct answer from the options given below :
JEE Main - 2022
JEE Main
Chemistry
Chemical Reactions
In two different experiments, an object of mass $5\, kg$ moving with a speed of $25 \,ms ^{-1}$ hits two different walls and comes to rest within
(i) 3 second,
(ii) 5 seconds, respectively.
Choose the correct option out of the following :
JEE Main - 2022
JEE Main
Physics
Magnetism and matter
Given below are two statements :
Statement I:
In polluted water values of both dissolved oxygen and BOD are very low.
Statement II:
Eutrophication results in decrease in the amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer from the options given below :
JEE Main - 2022
JEE Main
Chemistry
Water pollution
NCC parade is going at a uniform speed of $9\, km / h$ under a mango tree on which a monkey is sitting at a height of $196\, m$ At any particular instant, the monkey drops a mango A cadet will receive the mango whose distance from the tree at time of drop is : (Given g= 9.8 m/s
2
)
JEE Main - 2022
JEE Main
Physics
Motion in a straight line
The dimensions of $\left(\frac{ B ^2}{\mu_0}\right)$ will be :(if $\mu_0$ : permeability of free space andB : magnetic field)
JEE Main - 2022
JEE Main
Physics
Moving charges and magnetism
Which one is an amphoteric oxide:
BCECE - 2022
BCECE
Chemistry
p -Block Elements
A baby cools from 50°C to 40°C in 5 min. The surrounding temperature is 20°C. In what further time (in minutes) will it cool to 30°C?
BCECE - 2022
BCECE
Physics
thermal properties of matter
A,B and C are voltmeters of resistance R,
\(\frac{3}{2}R\)
and 3R respectively. When some potential difference is applied between X and Y, the voltmeters readings are V
A
, V
B
and V
C
respectively. Then:
BCECE - 2022
BCECE
Physics
Current electricity
Write down the structure of picric acid
VITEEE - 2022
VITEEE
Chemistry
Alkynes
are radish and carrot the root modification?
VITEEE - 2022
VITEEE
Biology
Morphology of flowering plants
Volatility of following solutions : H
2
O , H
2
Se, H
2
Te, H
2
PO
VITEEE - 2022
VITEEE
Chemistry
p -Block Elements
What is Acrolein?
VITEEE - 2022
VITEEE
Chemistry
Acids and Bases
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