WBJEE Chemistry Test - 7


40 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests | WBJEE Chemistry Test - 7


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Attempt WBJEE Chemistry Test - 7 | 40 questions in 60 minutes | Mock test for JEE preparation | Free important questions MCQ to study WBJEE Sample Papers, Section Wise & Full Mock Tests for JEE Exam | Download free PDF with solutions
QUESTION: 1

Which of the following species can act both as Bronsted acid and base ?
NH₂⁻ 2. HCO₃⁻ 3. NH₄⁺ 4. HSO₄⁻
Select the correct answer using the codes given below :

Solution:
QUESTION: 2

The compound 'A' when treated with methyl alcohol and few drops of H₂SO₄ give wintergreen smell. The compound 'A' is

Solution:
QUESTION: 3

Which of the following does not turn Schiff's reagent to pink ?

Solution:
QUESTION: 4
Which is most soluble in water?
Solution:
QUESTION: 5
By passing H₂S gas in acidified KMnO₄, we get
Solution:
QUESTION: 6

In H₂O₂ molecule, the angle between two O-H planes is

Solution:
QUESTION: 7
For the energy levels in an atom, which one of the following statements is correct?
Solution:
QUESTION: 8
The effect of atoms or groups loosing electrons towads a carbon atom is called
Solution:
QUESTION: 9
Cane sugar on hydrolysis gives
Solution:
QUESTION: 10
A liquid is in equilibrium with its vapour at its boiling point. The molecules in these two phases will have equal
Solution:
QUESTION: 11
The heats of combustion of carbon and carbon monoxide are -390 KJ and -278 KJ respectively. The heat of formation of carbon monoxide is
Solution:
QUESTION: 12
The half life of a reaction is found to be inversely proportional to the cube of its initial concentration of the reactants. The order of the reaction is
Solution:
QUESTION: 13
If a gas at constant temperature and pressure expands, then its
Solution:
QUESTION: 14
Vanishing creams differ from other creams due to the presence of
Solution:
QUESTION: 15
The number of ether metamers respresented by formula C₄H₁₀O is
Solution:
QUESTION: 16
Silver chloride dissolves in excess of NH₄OH. The cation present in the resulting solution is
Solution:
QUESTION: 17
The main function of roasting is
Solution:
QUESTION: 18
The compressibility factor of an ideal gas is
Solution:
QUESTION: 19
Inorganic benzene contains
Solution:
QUESTION: 20
Which among CH₄, SiH₄, GeH₄ and SnH₄ is most volatile?
Solution:
QUESTION: 21
Phosphine is prepared by the action of
Solution:
QUESTION: 22
The absorption of hydrogen on palladium is called
Solution:
QUESTION: 23

The activity of carbon-14 in a piece of ancient wood is only 12.5%. If the half life period of carbon-14 is 5760 years, the age of the piece of wood will be

Solution:
QUESTION: 24
Which of the following pair represents stereoisomerism?
Solution:
QUESTION: 25
Aniline reacts with concentrated HNO₃ to give :
Solution:
QUESTION: 26
Which of the following is a polyamide?
Solution:
QUESTION: 27
Teflon is a polymer, monomer of which is
Solution:
QUESTION: 28

The oxidation number of S in S2⁻ is

Solution:
QUESTION: 29
Ionic addition of bromine to cis-2-butene yields
Solution:
QUESTION: 30
Due to Frankel defect, the density of ionic solids
Solution:
QUESTION: 31

Solubility product constants (Ksp) of salts of types MX, MX2 and M3X at temperature 'T' are 4.0 x 10-8, 3.2 x 10-14 and 2.7 x 10-15, respectively. Solubilities (mol dm-3) of the salts at temperature 'T' are in the order

Solution:
QUESTION: 32

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is

Solution:
QUESTION: 33

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Shape of NH3 molecule is tetrahedral.
Reason(R): In NH3 nitrogen is sp3 hydridised.

Solution:
QUESTION: 34

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is

Solution:

The CMC (critical micelle concentration) value of the surfactants depends both on the size of the hydrophobic chain (tail) and size of the hydrophilic domain (head). The two contributions are counteracting with a lower CMC for a larger hydrophobic chain and a higher hydrophilic domain.

QUESTION: 35

Toluic acid on reaction with Br₂ + Fe gives

Solution:
*Multiple options can be correct
QUESTION: 36

Which of the following sets of phenomenon shown by the radiations proves the dual nature of radiations

Solution:
*Multiple options can be correct
QUESTION: 37

In the reaction
Cl2+OH− → Cl + ClO4 + H2O,chlorineis

Solution:
*Multiple options can be correct
QUESTION: 38

The compounds used as refrigerant are :

Solution:
*Multiple options can be correct
QUESTION: 39

Which of the following are the examples of aldol condensation ?

Solution:
*Multiple options can be correct
QUESTION: 40

Which statement(s) about cathode rays is/are correct?

Solution:
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