List of top Chemistry Questions

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime The metal ion is:

Increasing order of stability of the resonance structures is:
 
Choose the correct answer from the options given below:

What will be the concentration of ammonium ions (NH₄⁺) in moles per litre units in a solution having 10 ppm of ammonium ions ?

For the reaction
2N₂O₅→4NO₂+0₂
Rate of the reaction is:

Identify the major product in the following reaction.

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:

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

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:

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

The relative order of stability of conformers of 1,3-dimethylcyclohexane is (equatorial - e, axial-a)

Arachno and nido structure of Boranes have general formula respectively

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:

Benzyne bond is formed by the

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

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

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

The following reaction undergoes via _________ and is known as ______ reaction.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Concentrated HNO₃ is colourless but often turns yellow on keeping.
Reason R: Photo chemical decomposition of HNO₃ gives NO₂.
In the light of the above statements, choose the most appropriate answer from the options given below:

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 major product in the following reaction

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

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.