List of top Chemistry Questions

Which of the following is most stable?
Match List I with List II. 
 List-I List-II
A.
I.Br2 in CS2
B.
II.Na2CR2O7/H2SO4
C.
III.Zn
D.
IV.CHCl3/NaOH

Choose the correct answer from the options given below:
The \(\left(\frac{\partial E}{\partial T}\right)_p\) of different types of half cells are as follows:
ABCD
1 × 10-42 × 10-40.1 × 10-40.2 × 10-4

(Where E is the electromotive force)
Which of the above half cells would be preferred to be used as reference electrode?

Polar stratospheric clouds facilitate the formation of:
The formula of the purple colour formed in Laissaigne’s test for sulphur using sodium nitroprusside is
Compound ‘P’ on nitration with dil. HNO3 yields two isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO3 yields a yellow compound ‘C’, a strong acid. The number of oxygen atoms is present in compound ‘C’ _____
For combustion of one mole of magnesium in an open container at 300K and 1bar pressure, ΔCHΘ=–601.70kJ mol–1, the magnitude of change in internal energy for the reaction is______ kJ. (Nearest integer) (Given : R = 8.3 J K–1 mol–1)
Fig. 













If the initial pressure of a gas 0.03 atm, the mass of the gas absorbed per gram of the adsorbent is ____× 10–2g

A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of 
\(\frac{[CH_3CH_2COO^−]}{[CH_3CH_2COOH] }\)
required to make buffer is _____.
Given : Ka(CH3CH2COOH) = 1.3 × 10–5

L-isomer of a compound ‘A’ \((C_4H_8O_4)\) gives a positive test with \([Ag(NH_3)^2]^+\). Treatment of ‘A’ with acetic anhydride yields triacetate derivative. Compound ‘A’ produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and \(HNO_3\) respectively. Compound (A) is:
Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol –1. (Nearest Integer) [Given: R = 0.082 L atm K–1 mol–1]
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given : Molar mass of \(Ag\) is 108 g mol–1 and that of \(Cl\) is 35.5 g mol–1
The number of chiral alcohol(s) with molecular formula C4H10O is ____.
Which of the following compound does not contain sulphur atom?
Which of the following structures are aromatic in nature?
Which of the following structures are aromatic in nature
If the radius of the 3rd Bohr’s orbit of hydrogen atom is r3 and the radius of 4th Bohr’s orbit is r4. Then

Using the rules for significant figures, the correct answer for the expression
\(\frac{0.02858 × 0.112}{ 0.5702}\)
will be

Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is________ B.M. (Nearest integer)

Choose the correct order of density of the alkali metals.

The reaction of H2O2 with potassium permanganate in acidic medium leads to the formation of mainly

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 :

Melamine polymer is formed by the condensation of :

Which one of the following reactions does not represent correct combination of substrateand product under the given conditions?

Most stable product of the following reaction is :
Most stable product