Chemistry questions
29404 published questions with worked solutions.
- Match List-I with List-II: List-I (Precipitating reagent and conditions): A. NH₄Cl + NH₄OH B. NH₄OH + Na₂CO₃ C. NH₄OH + NH₄Cl +...
- The electron affinity value are negative for: A. Be → Be⁻ B. N → N⁻ C. O → O²⁻ D. Na → Na⁻ E. Al → Al⁻ Choose the most...
- The number of element from the following that do not belong to lanthanoids is: Eu, Cm, Er, Tb, Yb and Lu
- The density of 'x' M solution ('x' molar) of NaOH is 1.12 g mL⁻¹, while in molality, the concentration of the solution is 3 m (3...
- Which among the following aldehydes is most reactive towards nucleophilic addition reaction?
- If equal number of H₂, I₂ and HI molecules are present at equilibrium for the reaction H₂(g) + I₂(g) ⇌ 2HI(g), the K_P for the...
- Match List-I with List-II: List-I (Compound): A. Iodoform B. Carbon tetrachloride C. CFC D. DDT List-II (Uses): I. Fire...
- A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak...
- Consider the dissociation of the weak acid HX as given below: HX(aq) ⇌ H⁺(aq) + X⁻(aq), K_a = 1.2 × 10⁻⁵ [K_a: dissociation...
- The difference in the 'spin-only' magnetic moment values of KMnO₄ and the manganese product formed during titration of KMnO₄...
- Time required for 99.9% completion of a first order reaction is ____ time the required for completion of 90% reaction. (nearest...
- 9.3 g of pure aniline upon diazotization followed by coupling with phenol gives an orange dye. The mass of orange dye produced...
- The major product of the following reaction is P. CH₃C≡C–CH₃ (i) Na/liq. NH₃, (ii) dil. KMnO₄, 273 K → 'P'. Number of oxygen...
- Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is ____ × 10¹³ Hz. (nearest integer) [Given:...
- Among CrO, Cr₂O₃ and CrO₃, the sum of spin-only magnetic moment values of basic and amphoteric oxides is ______ × 10⁻² BM...
- The IUPAC name of the complex [ Pt(NH_3)_2Cl(NH_2CH_3) ] Cl is :
- Consider the following reactions : (a) (CH_3)_3CCH(OH)CH_3 conc. H_2SO_4 (b) (CH_3)_2CHCH(Br)CH_3 conc. KOH (c)...
- Amongst the following statements, that which was not proposed by Dalton was -
- At 35ºC, the vapour pressure of CS_2 is 512 mm Hg and that of acetone is 344 mm Hg. A solution of CS_2 in acetone has a total...
- The purest form of commercial iron is :Not in JEE Main or NEET syllabus