List of top Chemistry Questions

Arachno and nido structure of Boranes have general formula respectively

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

When 3 moles of gas A is mixed with 1 mole of gas B at room temperature and 1 atm pressure, the entropy of mixing is
(Given log 3=0.4771,
log 4 = 0.6020)

The properties used for calculating Pauling's electronegativity and Mullikan electronegativity, respectively are

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The moving boundary method yields more accurate data on transference number than does the Hittorf method.
Reason R: In moving boundary method, indicator electrolyte has same anion as principal electrolyte and is placed at the bottom due to its higher density.
In the light of the above statements, choose the most appropriate answer from the options given below:

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

Phenylbenzoate can be prepared from phenol using which of the following name reaction?

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

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)

Considering the following reactions and their reduction potentials in acidic medium

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

Identify the major product in the following reaction.

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

Identify the class of the following reaction.

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:

Deduce the structure of the product in the following reaction

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

The initial rate of a reaction in which the substrate, S, undergoes a reaction in the presence of catalyst C, was found to be equal to v₀ = \(\frac{K_2[S]_0[C]_0}{[S]_0+Km} \)The probable condition in which the reaction took place was

Deduce the structure of the corresponding alcohol which shows the following reaction
C₆H₁₄0₃ \(\stackrel{2HIO_4}{\rightarrow}\) CH₃CHO + CH₃CH₂CHO + HCOOH

Which of the following compound represent the correct structure of (2R, 3S)-2,3-pentanediol?

Benzyne bond is formed by the

The structure of a carborane, \(C_2B_5H_7\), is

Match List I with List II:
     List I (Reaction)                                                                List II (Mettalo enzyme)
(A) \(R-H+O_2+2H^++2e^-R-OH+H_2O\)         (I) Cytochrome P-450
(B) \(2H_2O_2\rightarrow 2H_2O+O_2\)                                                 (II) Catalase
(C) e-transfer protein                                                           (III) Ferredoxin
(D) \(O_2+4H^++4e^- \rightarrow2H_2O\)                                     (IV)   Cytochrome (oxidase)
Choose the correct answer from the options given below:

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

Which of the following expression holds good for Freundlich adsorption isotherm ?

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.