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JEE Main Chemistry Test- 12 - JEE MCQ


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30 Questions MCQ Test - JEE Main Chemistry Test- 12

JEE Main Chemistry Test- 12 for JEE 2025 is part of JEE preparation. The JEE Main Chemistry Test- 12 questions and answers have been prepared according to the JEE exam syllabus.The JEE Main Chemistry Test- 12 MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Main Chemistry Test- 12 below.
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JEE Main Chemistry Test- 12 - Question 1
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The density of chlorine relative to air is

Detailed Solution for JEE Main Chemistry Test- 12 - Question 1
Clhas a molecular mass of 71 g. And molecular mass of Air is 29 g .
Relative density of chlorine =( Mass of chlorine/ Volume of chlorine) / (Mass of air/ Volume of air )
Volume of any gas at STP = 22.4 l Relative density of chlorine = (71 / 22.4 ) / (29/22.4)
Relative density of chlorine = 2.44 
JEE Main Chemistry Test- 12 - Question 2
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Which of the following has the highest mass ?

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JEE Main Chemistry Test- 12 - Question 3
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How many moles of electrons wieght one kilogram ?

JEE Main Chemistry Test- 12 - Question 4
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10 mL of gaseous hydrocarbon on combustion gives 40 mL of (g) and 50 mL of (vap.).The
hydrocarbon is
JEE Main Chemistry Test- 12 - Question 5
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Normality of 1% solution is nearly
JEE Main Chemistry Test- 12 - Question 6
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0.7 g of is dissolved in 10 mL of water, 20mL of which required 19.8 mL of 0.1 N HCl. The value of x is
JEE Main Chemistry Test- 12 - Question 7
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The energy of the second Bohr orbit of the hydrogen atom is –3.41 eV. The energy of the third Bohr orbit of the ion will be
JEE Main Chemistry Test- 12 - Question 8
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The energy of an electron in the first Bohr orbit of H-atom is –13.6 eV. The possible energy values(s)
of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)
JEE Main Chemistry Test- 12 - Question 9
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The number of nodal planes in a orbital is
JEE Main Chemistry Test- 12 - Question 10
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The ratio of time periods in first and second orbits of hydrogen atom is
JEE Main Chemistry Test- 12 - Question 11
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The sub-shell that comes after f-sub-shell is called g-sub-shell. The number of g-sub orbitals in g-sub shell and the total number of orbitals in the principal orbital respectively are
JEE Main Chemistry Test- 12 - Question 12
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The e/m for positive rays in comparison to cathod rays is
JEE Main Chemistry Test- 12 - Question 13
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If n and l are respectively the principal and azimuthal quantum numbers, then the expression for calculating total number of electrons in any energy level is
Detailed Solution for JEE Main Chemistry Test- 12 - Question 13

If n and l are principal and azimuthal quantum numbers respectively, then the expression for calculating the total number of electrons in any energy level is 

JEE Main Chemistry Test- 12 - Question 14
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The law of triads is applicable to
JEE Main Chemistry Test- 12 - Question 15
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Mendellev’s periodic table is upset by the fact that
JEE Main Chemistry Test- 12 - Question 16
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Name the two elements that are liquid at ordinary temperature
JEE Main Chemistry Test- 12 - Question 17
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Traid-I  [N3-,  Na+]
Traid-II [N+, C+,O+] Choose the species of lowers IP from traid-I and the species of highest IP from traid-II respectively
Detailed Solution for JEE Main Chemistry Test- 12 - Question 17
  • Lowest IP in Triad-I: N3- has more electrons than protons, making it easier to remove an electron compared to Na.
  • Highest IP in Triad-II: O+ has a higher nuclear charge than N and C, leading to a stronger hold on its electrons.

Thus, the species with the lowest IP from Triad-I is N3-, and the highest IP from Triad-II is O+.

JEE Main Chemistry Test- 12 - Question 18
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Arrange the elements with the following electronic configurations in increasing order of electron affinity     
               

JEE Main Chemistry Test- 12 - Question 19
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The IUPAC name of the compound
JEE Main Chemistry Test- 12 - Question 20
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The IUPAC name of the compound
JEE Main Chemistry Test- 12 - Question 21
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The IUPAC name of the compound is
JEE Main Chemistry Test- 12 - Question 22
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Which of the following shows tautomerism ?
JEE Main Chemistry Test- 12 - Question 23
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Which of the following is the correct order of stability of the following four distinct conformations of nbutane?
JEE Main Chemistry Test- 12 - Question 24
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Which among the following is likely to show geometrical isomerism?
Detailed Solution for JEE Main Chemistry Test- 12 - Question 24

The solution involves identifying compounds that can show geometrical isomerism. Geometrical isomerism occurs in compounds with restricted rotation, typically around double bonds, and requires different groups attached to each end of the double bond.

  • Compound D can show geometrical isomerism due to the presence of a double bond with different substituents attached to each carbon.
  • This type of isomerism is possible because the double bond prevents rotation, allowing for different spatial arrangements, such as cis and trans forms.
  • In compound D, the arrangement of these groups can lead to different isomers that are not interconvertible without breaking the double bond.

Therefore, compound D is likely to show geometrical isomerism.

JEE Main Chemistry Test- 12 - Question 25
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Which one of the following is the stablest structure of cyclohexatriene ?
JEE Main Chemistry Test- 12 - Question 26
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meso-Tartaric acid is optically inactive due to the presence of
JEE Main Chemistry Test- 12 - Question 27
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The absolute cofiguration of the following compound is
JEE Main Chemistry Test- 12 - Question 28
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The strucutre of is
JEE Main Chemistry Test- 12 - Question 29
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The most stable carbonation among the following is
JEE Main Chemistry Test- 12 - Question 30
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Toluene has
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