Chemistry questions
29404 published questions with worked solutions.
- High purity (>99.95%) dihydrogen is obtained by (A) Reaction of zinc with aqueous alkali (B) Electrolysis of acidified water...
- The total number of acidic oxides from the following list is NO, N_ 2 O, B_ 2 O_ 3 , N_ 2 O_ 5 , CO, SO_ 3 , P_ 4 O_ 10
- The correct order of energy of absorption for the following metal complexes is A : [Ni(en)_ 3 ]^ 2+ , B : [Ni(NH_ 3 )_ 6 ]^ 2+ ,...
- CH_ 3 -CH_ 2 -CN (CH_ 3 MgBr, Ether) A (H_ 3 O^ + ) B (Zn–Hg, HCl) C. The correct structure of C is
- Glycosidic linkage between C_ 1 of -glucose and C_ 2 of -fructose is found in
- Some drugs bind to a site other than the active site of an enzyme. This site is known asNot in JEE Main or NEET syllabus
- In base vs. acid titration, at the end point methyl orange is present as
- 56.0 L of nitrogen gas is mixed with excess of hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of...
- When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are...
- While performing a thermodynamics experiment, a student made the following observations. HCl + NaOH NaCl + H_ 2 O; H = −57.3 kJ...
- The sum of number of lone pairs of electrons present on the central atoms of XeO_ 3 , XeOF_ 4 and XeF_ 6 is _____ .
- The spin-only magnetic moment value of M^ 3+ ion (in gaseous state) from the pairs Cr^ 3+ /Cr^ 2+ , Mn^ 3+ /Mn^ 2+ , Fe^ 3+ /Fe^...
- A sample of 4.5 mg of an unknown monohydric alcohol, R–OH was added to methylmagnesium iodide. A gas is evolved and is collected...
- The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A...
- The total number of monobromo derivatives formed by the alkanes with molecular formula C_ 5 H_ 12 (excluding stereo isomers) is...
- Which of the following sets of quantum numbers is not allowed?
- The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^ -1 is 0.0405°C. Density of formic...
- 20 mL of 0.1 M NH_ 4 OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to (Given : K_ b (NH_ 4 OH) = 1 10^...
- Match List-I with List-II. List-I: (A) N_ 2 (g) + 3H_ 2 (g) 2NH_ 3 (g) (B) CO(g) + 3H_ 2 (g) CH_ 4 (g) + H_ 2 O(g) (C) CO(g) + H_...Not in JEE Main or NEET syllabus
- The IUPAC nomenclature of an element with electronic configuration [Rn] 5f^ 14 6d^ 1 7s^ 2 is