JEE Main Chemistry Test- 12

Question 1

The density of chlorine relative to air is

Accepted Answer

2.44 I

Answer

3

Answer

found only experimentally

Answer

4

Question 2

Which of the following has the highest mass ?

Accepted Answer

1 g-atom of C

Answer

1/2 mole of

Answer

10 mL of water

Answer

atoms of oxygen

Question 3

How many moles of electrons wieght one kilogram ?

Accepted Answer

Answer

Answer

Answer

Question 4

10 mL of gaseous hydrocarbon on combustion gives 40 mL of

(g) and 50 mL of

(vap.).The
hydrocarbon is

Accepted Answer

Answer

Answer

Answer

Question 5

Normality of 1% <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_58e288b2-58b7-4e0b-87ae-6d7c11e8d7ec_lg.PNG"> solution is nearly

Accepted Answer

0.2

Answer

2.5

Answer

0.1

Answer

1

Question 6

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

Accepted Answer

2

Answer

4

Answer

3

Answer

1

Question 7

The energy of the second Bohr orbit of the hydrogen atom is –3.41 eV. The energy of the third Bohr orbit of the <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_13924373-6710-4fa8-bad9-5d8c0fc912b7_lg.PNG"> ion will be

Accepted Answer

–6.06 eV

Answer

–30.69 eV

Answer

–13.64 eV

Answer

–7.67 eV

Question 8

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)

Accepted Answer

&ndash;3.4 eV

Answer

&ndash;4.2 eV

Answer

&ndash;6.8 eV

Answer

6.8 eV

Question 9

The number of nodal planes in a <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_b6ad83b3-5a9d-42e6-bf40-fe4cc4fcd378_lg.PNG"> orbital is

Accepted Answer

1

Answer

2

Answer

3

Answer

0

Question 10

The ratio of time periods in first and second orbits of hydrogen atom is

Accepted Answer

1:8

Answer

1:4

Answer

1:2

Answer

2:1

Question 11

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

Accepted Answer

9 and 25

Answer

10 and 25

Answer

11 and 23

Answer

15 and 45

Question 12

The e/m for positive rays in comparison to cathod rays is

Accepted Answer

Vary low

Answer

High

Answer

Same

Answer

None

Question 13

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

Accepted Answer

Answer

Answer

Answer

none

Question 14

The law of triads is applicable to

Accepted Answer

Cl, Br, I

Answer

C,N,O

Answer

H,O,N

Answer

Na, K,Rb

Question 15

Mendellev’s periodic table is upset by the fact that

Accepted Answer

Many elements have several isotopes

Answer

Noble gases do not form compounds

Answer

Atomic weights of element are not always whole numbers

Answer

None of these

Question 16

Name the two elements that are liquid at ordinary temperature

Accepted Answer

Mercury, Bromine

Answer

Bromine, Astatine

Answer

Mercury, Astatine

Answer

None of these

Question 17

Traid-I [N^3-, 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

Accepted Answer

N3-, O+

Answer

Na+,C+

Answer

N^3-, Na⁺

Answer

O+, C+

Question 18

Arrange the elements with the following electronic configurations in increasing order of electron affinity

Accepted Answer

III<II<IV<I

Answer

I<II<III<IV

Answer

IV<III<II<I

Answer

II<III<I<IV

Question 19

The IUPAC name of the compound <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_0526626d-cbf5-4466-a1a6-170ed6a15862_lg.PNG">

Accepted Answer

5-Methylcyclopent-2-en-1-ol

Answer

4-Methylcyclopent-1-en-2-ol

Answer

2-Methylcyclopent-4-en-1-ol

Answer

3-Methylcyclopent-1-en-2-ol

Question 20

The IUPAC name of the compound <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_225b0eb9-7085-4366-a520-921f33c906e8_lg.PNG">

Accepted Answer

1-Cyclopentylhexane

Answer

Hexylcyclopentane

Answer

Pentylcyclohexane

Answer

1- Cyclohexylpentane

Question 21

The IUPAC name of the compound <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_7a9ef7d1-4f16-4a70-9301-5088639231f6_lg.PNG"> is

Accepted Answer

3- Amino-5-heptenoic acid

Answer

5-Amino-2-heptenoic acid

Answer

-Amino-

-heptanoic acid

Answer

5-Aminohex-2-enecarboxylic acid

Question 22

Which of the following shows tautomerism ?

Accepted Answer

None of these

Answer

Benzophenone

Answer

Benzaldehyde

Answer

Di-tert-butyl ketone

Question 23

Which of the following is the correct order of stability of the following four distinct conformations of nbutane?

Accepted Answer

Staggered > Gauche > Partially ellipse > Fully eclipsed

Answer

Gauche > Staggered > Partially ecilpsed > Fully eclipsed

Answer

Staggered > Partially ecilpsed > Gauche > Fully eclipsed

Answer

Fully eclipsed >Staggered > Partially ecilpsed >Gauche

Question 24

Which among the following is likely to show geometrical isomerism?

Accepted Answer

Answer

Answer

Answer

Question 25

Which one of the following is the stablest structure of cyclohexatriene ?

Accepted Answer

Planar form

Answer

Chair form

Answer

Boat form

Answer

Half chair form

Question 26

meso-Tartaric acid is optically inactive due to the presence of

Accepted Answer

Molecular symmetry

Answer

Molecular asymmetry

Answer

External compensation

Answer

Two asymmetry carbon atoms

Question 27

The absolute cofiguration of the following compound is

Accepted Answer

2S,3S

Answer

2S,3R

Answer

2R, 3S

Answer

2R,3R

Question 28

The strucutre of <img class="uploadedImage" src="https://cn.edurev.in/ApplicationImages/Temp/457878_10f41067-64b9-4cce-8c3a-daaf8bb6e1b4_lg.PNG"> is

Accepted Answer

non-planar

Answer

linear

Answer

planar

Answer

has several resonance structures

Question 29

The most stable carbonation among the following is

Accepted Answer

Answer

Answer

Answer

Question 30

Toluene has

Accepted Answer

15 <img alt="" src="https://cn.edurev.in/ApplicationImages/Temp/457878_66b70b15-7061-4ff4-be47-d8033c97b39f_lg.PNG" />

Answer

6 <img alt="" src="https://cn.edurev.in/ApplicationImages/Temp/457878_321ee6a2-a9aa-40cf-923f-26839dfadb43_lg.PNG" />

Answer

9 <img alt="" src="https://cn.edurev.in/ApplicationImages/Temp/457878_789ccad1-aff0-4398-91da-5b651b120c1d_lg.PNG" />

Answer

9 <img alt="" src="https://cn.edurev.in/ApplicationImages/Temp/457878_fac01d9e-5733-41ff-8a55-9806e9443a65_lg.PNG" />

JEE Main & Advanced Chemistry Test- 12 Free Online Test 2026

MCQ Practice Test & Solutions: JEE Main Chemistry Test- 12 (30 Questions)

The density of chlorine relative to air is

Which of the following has the highest mass ?

How many moles of electrons wieght one kilogram ?

10 mL of gaseous hydrocarbon on combustion gives 40 mL of (g) and 50 mL of (vap.).Thehydrocarbon is

Normality of 1% solution is nearly

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

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

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)

The number of nodal planes in a orbital is

The ratio of time periods in first and second orbits of hydrogen atom is

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

The e/m for positive rays in comparison to cathod rays is

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

The law of triads is applicable to

Mendellev’s periodic table is upset by the fact that

Name the two elements that are liquid at ordinary temperature

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

Arrange the elements with the following electronic configurations in increasing order of electron affinity

The IUPAC name of the compound

The IUPAC name of the compound

The IUPAC name of the compound is

Which of the following shows tautomerism ?

Which of the following is the correct order of stability of the following four distinct conformations of nbutane?

Which among the following is likely to show geometrical isomerism?

Which one of the following is the stablest structure of cyclohexatriene ?

meso-Tartaric acid is optically inactive due to the presence of

The absolute cofiguration of the following compound is

The strucutre of is

The most stable carbonation among the following is

Toluene has

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10 mL of gaseous hydrocarbon on combustion gives 40 mL of (g) and 50 mL of (vap.).The
hydrocarbon is

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)

Traid-I [N^3-, 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