List of top Chemistry Questions

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

Which statement is NOT correct for p-toluenesulphonyl chloride?
Which one of the following is a water soluble vitamin, that is not excreted easily?
Which of the following is NOT an example of synthetic detergent?
Sugar moiety in DNA and RNA molecules, respectively are
Which of the following compound does not contain sulphur atom?

Given below are two statements.

Statement I : Phenols are weakly acidic.

Statement II : Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water.

Choose the most appropriate option.

The intermediate X, in the reaction is:
The intermediate X, in the reaction
In the following reaction:
In the reaction compound A and B is
The compound A and B respectively are:
The reaction of
 Reaction with bromine and KOH
with bromine and \(KOH\) gives \(RNH_2\) as the end product. Which one of the following is the intermediate product formed in this reaction?
Which of the following sets of quantum numbers is not allowed?
20 mL of 0.1 M NH4OH is mixed with 40 mL of 0.05 M HCl.The pH of the mixture is nearest to:(Given: Kb(NH4OH) = 1 × 10–5 ,log 2 = 0.30,log 3 = 0.48, log 5 = 0.69, log 7 = 0.84, log 11 =1.04)

Match List-I with List-II.

List-IList-II
(A)N2(g) + 3H2(g) \(\rightarrow\) 2NH3(g)(I)Cu
(B)CO(g) + 3H2(g) \(\rightarrow\) CH4(g) + H2O(g)(II)Cu/ZnO – Cr2O3
(C)CO(g) + H2(g) \(\rightarrow\)HCHO(g)(III)FexOy + K2O + Al2O3
(D)CO(g) + 2H2(g) \(\rightarrow\) CH3OH(g)(IV)Ni


Choose the correct answer from the options given below :

The compound(s) that is(are) removed as slag during the extraction of copper is 
(A) CaO 
(B) FeO 
(C) Al2O3 
(D) ZnO 
(E) NiO 
Choose the correct answer from the options given below :
The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are –2220.0 kJ mol–1, –393.5 kJ mol–1 and –285.8 kJ mol–1, respectively.The magnitude of enthalpy of formation of propane (C3H8) is _____ kJ mol–1. (Nearest integer)
Match List-I with List-II
List-I (Compound)List-II (Shape)
(A) \(BrF_5\)(I) bent
(B) \([CrF_6]^{3–}\)(II) square pyramidal
(C) \(O_3\)(III) trigonal bipyramidal
(D) \(PCI_5\)(IV) octahedral
Choose the correct answer from the options given below :
Given two statements below:
Statement I : In \(Cl_2\) molecule the covalent radius is double of the atomic radius of chlorine.
Statement II : Radius of anionic species is always greater than their parent atomic radius.
Choose the most appropriate answer from options given below:
Refining using the liquation method is the most suitable for metals with:
Which of the following can be used to prevent the decomposition of \(H_2O_2\)?
Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of “X” with 6-equivalents of “Y”. “X” and “Y”, respectively are:
Which of the given reactions is not an example of a disproportionation reaction?
The dark purple colour of \(KMnO_4\) disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :
\(\dot Cl + CH_4 → A + B\)
A and B in the above atmospheric reaction step are:
Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid?