List of top Chemistry Questions

Given below are two statements:
Statement I : H₂O₂ is used in the synthesis of Cephalosporin
Statement II : H₂O₂ is used for the restoration of aerobic conditions to sewage wastes.
In the light of the above statements, choose the most appropriate answer from the options given below :

Caprolactam when heated at high temperature in presence of water, gives

Compound $A , C _5 H _{10} O _5$, given a tetraacetate with $AC _2 O$ and oxidation of $A$ with $Br _2- H _2 O$ gives an acid, $C _5 H _{10} O _6$ Reduction of $A$ with $HI$ gives isopentane The possible structure of $A$ is:

Which one of the following statements is incorrect?

Lithium aluminium hydride can be prepared from the reaction of

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning
In the light of the above statements, choose the correct answer from the options given below :

Which of the following is correct order of ligand field strength?

The Lewis acid character of boron tri halides follows the order :

Match List I with List II

Choose the correct answer from the options given below:

Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic number $Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61$ )
A. $Sm$
B. $Eu$
C. $Tb$
D. $Gd$
E. $Pm$
Choose the correct answer from the options given below :

Which of the following compounds would give the following set of qualitative analysis?

Fehling's Test: Positive
Na fusion extract upon treatment with sodium nitroprusside gives a blood-red colour but not prussian blue

The element playing significant role in neuromuscular function and interneuronal transmission is :

Amongst the following compounds, which one is an antacid?

Freezing point of solution is less than that of pure solvent, which of the following statements are correct ?
(A) Vapour pressure of solution is less than that of pure solvent
(B) Vapour pressure of solution is greater than that of pure solvent
(C) Only solvent molecules will freeze
(D) Only solute molecules will freeze

Find correct order of covalent character (A) $KF < KI$ (B) $CuCl > NaCl$ (C) $LiF > KF$

Number of unpaired electron in highest occupied molecular orbital of following species is :$N_2, N ^+_ 2 , O_2, O^+_ 2 $ ?

Which one amongst the following are good oxidizing agents?
(A) $ \text{Sm}^{\text{2+}}$
(B) $\text{Ce}^{\text{2+}}$
(C)$ \text{Ce}^{\text{4+}}$
(D) $\text{Tb}^{\text{4+}}$
Choose the most appropriate answer from the options given below:

An $ \alpha $-particle, a proton, and an electron have the same kinetic energy. Which one of the following is correct in case of their De-Broglie wavelength:

Which of the following statements is correct about freons?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature
Reason R: CO tends to get decomposed at higher temperature
In the light of the above statements, choose the correct answer from the options given below

For which of the following aqueous ion, spin only magnetic moment is 3.87 BM?

How many reactions are non-spontaneous at 300 K. For independent reaction ΔH & ΔS values are given.

Graph of X-ray frequency (v)n v/s atomic number (Z) is linear. Find the value of n.

Match the following:

Column-I	Column-II
(A) Zone refining	(P) pig iron
(B) Electrolysis	(Q) Al
(C) Reverberatory furnace	(R) Si
(D) Blast furnace	(S) Cu

The effect of addition of helium gas to the following reaction in equilibrium state, is : $PCl _5( g ) \rightleftharpoons PCl _3( g )+ Cl _2( g )$