List of top Chemistry Questions asked in CUET (PG)

The bond enthalpies for C-H, C1-C1, C-C1 and H-Cl are 99, 58, 78 and 103 kcal/mol respectively. What will be the AH for the reaction
CH_4(g) + Cl_2(g) → CH₃Cl_(g) + HCl_(g)

The galvanic cell with the cell reaction
Mg(s) + 2Ag⁺ (0.001M)→ Mg²⁺ (0.65M) + 2Ag(s)
is correctly represented as

Select the option which is correct about photochemical reaction:
A. Temperature has very little effect on rate of reaction.
B. The presence of light is the primary requirement.
C. AG may be positive or negative for spontaneous photochemical reaction.
D. Photochemical reaction always involves emission of light radiation.
Choose the correct answer from the options given below:

Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The surface tension of a liquid is the combined strength of the polar of dispersion forces that are pulling on the molecules in the surface of the liquid.
Reason R: The addition of small quantities ion of impurities will alter the surface tension.
In the light of the above statements, choose the most appropriate answer from the options given below:

The phenomenon of existence of two or more compounds possessing the same molecular formula but different properties is referred as ________ .

Membrane filters are not manufactured from which of following polymers

Number of C-O stretching frequency bands observed for M(CO)₆ : M(CO)₃L₃ (fac-isomer), M(CO)₃L₃ (mer- isomer), respectively are:

Which of the following is NOT a cellulosic fibre?

Kronecker delta is defined by

Identify the class of the following reaction.

The hydrolysis products of \(Al_4,C_3\), and \(Be_2C\) are

The experimental magnetic moment (3.4 BM) of a hydrated salt of \(Eu^{3+}\) at 300 K is significantly different from calculated value. The difference is due to (Given atomic number of \(E_u\) = 63)

The correct combination of enzyme and metal ion at the active site is

Given below are two statements:
Statement I: To form interstitial alloys, the radius ratio of smaller atom/larger atom should be in the range 0.414-0.732.
Statement II: Two different metals having metallic radii differing only by 10% but similar crystal structures can form a good alloy.
In the light of the above statements, choose the most appropriate answer from the options given below:

A monochromatic radiation is incident on a solution of 0.05 molar concentration of an absorbing substance. The intensity of the radiation is reduced to one fourth of the initial value after passing through 10 cm length of the solution. Calculate the molar extinction. coefficient of the substance.

Following anti-oxidant is used to prevent oxidative degradation of plastic :

Identify the infrared active molecules from the following
A. N₂
B. NO
C. CO
D. CO₂
Choose the correct answer from the options given below:

Considering the following reactions and their reduction potentials in acidic medium

What will be the free energy change (\(\triangle\)G) of the reaction. \(IO^-_3\)→ \(\frac{1}{2}I_2\)

Which among the elements of Lanthanoid series often exhibit +4 oxidation state?

The following carbonyl compounds absorb IR radiations in the decreasing order.
A.
B.
C.
D.
Choose the correct answer from the options given below:

What are the most common electronic transition(s) associated with carbonyl functional group?
\(\alpha\rightarrow\pi\) 
\(\alpha\rightarrow n\) 
\(n \rightarrow \pi^*\)
\(\pi \rightarrow \pi^*\)

Find out the degree of dissociation of HF in 1 M aqueous solution. The value of K for the ionic equilibrium \(HF ⇌ H^++F^-\; is \;7.2 × 10^{-4.}\)

Phenol derivatives can be prepared from corresponding chlorobenzene derivatives via nucleophilic substitution reaction only when it contains

Given below are two statements:
Statement I: For Na⁺ | K⁺ pump, the active ion transport involve three Na⁺ expelled out for two K⁺ ions intake across the cell membrane.
Statement II: Binding of K⁺ induces phosphorylation of ADP to ATP.
In the light of the above statements, choose the most appropriate answer from the options given below:

Among the following mono nitrophenols which one is most acidic.