Chemistry Questions
Which reaction does NOT belong to Lassaigne’s test?
If the rate constant is 0.03 s⁻¹, time for concentration change 7.2 → 0.9 mol L⁻¹ is:
Higher yield of NO in N₂ + O₂ ⇌ 2NO (ΔH = +180.7 kJ/mol) A. Higher temperature B. Lower temperature C. Higher concentration of N₂ D. Higher concentration of O₂
Identify the correct orders: A. H₂O > NH₃ > CHCl₃ (dipole moment) B. XeF₄ > XeO₃ > XeF₂ (lone pairs) C. O–H > C–H > N–O (bond length) D. N₂ > O₂ > H₂ (bond enthalpy)
Total number of possible isomers (structural + stereoisomers) of cyclic ethers of molecular formula C₄H₈O is:
The standard heat of formation, in kcal/mol of Ba²⁺ is:
Given below are two statements: Assertion (A): Alkyl iodide undergoes SN2 reaction faster than alkyl chloride. Reason (R): Iodine is a better leaving group due to its larger size.
Identify the suitable reagent for the following conversion (ester → aldehyde):
Sugar ‘X’ A. Found in honey B. Keto sugar C. Shows α and β forms D. Laevorotatory ‘X’ is:
5 moles of liquid X and 10 moles of liquid Y make a solution having vapour pressure of 70 torr. Vapour pressures of pure X and Y are 63 torr and 78 torr respectively.
Match List-I with List-II. List-I A. Haber process B. Wacker oxidation C. Wilkinson catalyst D. Ziegler catalyst List-II I. Fe catalyst II. PdCl₂ III. [PPh₃]₃RhCl IV. TiCl₄ with Al(CH₃)₃
Which of the following aqueous solution will exhibit highest boiling point?
The major product of the following reaction is:
Which one of the following compounds does not decolourize bromine water?
Among the given compounds I–III, the correct order of bond dissociation energy of C–H bond marked with * is:
How many products (including stereoisomers) are expected from monochlorination of the given compound?
Given below are two statements: Statement I: Benzenediazonium salt is prepared by reaction of aniline with nitrous acid at 273–278 K. It decomposes easily in dry state. Statement II: Iodination in benzene ring is difficult, so iodobenzene is prepared
For the reaction A(g) ⇌ 2B(g), the backward rate constant is higher than forward rate constant by factor 2500 at 1000 K. Kp for the reaction at 1000 K is:
Match the List-I with List-II. List-I (Mixture) A. CHCl₃ + C₆H₅NH₂ B. Crude oil in petroleum industry C. Glycerol from spent-lye D. Aniline-water List-II (Method of Separation) I. Distillation under reduced pressure II. Steam distillation III. Fracti
Given below are two statements: Statement I: Ferromagnetism is considered as an extreme form of paramagnetism. Statement II: The number of unpaired electrons in Cr²⁺ (Z=24) is the same as that of Nd³⁺ (Z=60).
The correct order of decreasing acidity of the following aliphatic acids is:
Match the List-I with List-II. List-I (Vitamin) A. Vitamin B₁₂ B. Vitamin D C. Vitamin B₂ D. Vitamin B₆ List-II (Deficiency disease) I. Cheilosis II. Convulsions III. Rickets IV. Pernicious anaemia
Among the following, choose the ones with equal number of atoms. A. 212 g of Na₂CO₃ [molar mass = 106 g] B. 248 g of Na₂O [molar mass = 62 g] C. 240 g of NaOH [molar mass = 40 g] D. 12 g of H₂ [molar mass = 2 g] E. 220 g of CO₂ [molar mass = 44 g]
The correct order of decreasing basic strength of the given amines is:
Match the List-I with List-II. List-I A. Humidity B. Alloys C. Amalgams D. Smoke List-II I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solid
C(s) + 2H₂(g) → CH₄(g); ΔH = −74.8 kJ mol⁻¹ Which of the following diagrams gives an accurate representation of the above reaction?
Match the List-I with List-II. List-I A. XeO₃ B. XeF₂ C. XeOF₄ D. XeF₆ List-II I. sp³d; linear II. sp³; pyramidal III. sp³d³; distorted octahedral IV. sp³d²; square pyramidal
Out of the following complex compounds, which compound will have the minimum conductance in solution?
Given below are two statements: Statement I: A hypothetical diatomic molecule with bond order zero is quite stable. Statement II: As bond order increases, the bond length increases.
If the molar conductivity (Λm) of a 0.050 mol L⁻¹ solution of a monobasic weak acid is 90 S cm² mol⁻¹, its degree of dissociation will be [Assume Λ°H⁺ = 349.6 S cm² mol⁻¹ and Λ°A⁻ = 50.4 S cm² mol⁻¹]
Phosphoric acid ionizes in three steps with their ionization constant values Ka₁, Ka₂ and Ka₃ respectively, while K is the overall ionization constant. Which of the following statements are true? A. log K = log Ka₁ + log Ka₂ + log Ka₃ B. H₃PO₄ is str
Which one of the following compounds can exist as cis-trans isomers?
The correct order of the wavelength of light absorbed by the following complexes is, A. [Co(NH₃)₆]³⁺ B. [Co(CN)₆]³⁻ C. [Cu(H₂O)₄]²⁺ D. [Ti(H₂O)₆]³⁺
If the half-life (t₁/₂) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is close to:
Consider the following compounds: KO₂, H₂O₂ and H₂SO₄ The oxidation states of the underlined elements in them are, respectively,
Dalton's Atomic theory could not explain which of the following?
Which among the following electronic configurations belong to main group elements? A. [Ne]3s¹ B. [Ar]3d³4s² C. [Kr]4d¹⁰5s²5p⁵ D. [Ar]3d¹⁰4s¹ E. [Rn]5f⁰6d²7s²
Given below are two statements: Statement I: Like nitrogen that can form ammonia, arsenic can form arsine. Statement II: Antimony cannot form antimony pentoxide.
Which of the following are paramagnetic? A. [NiCl₄]²⁻ B. Ni(CO)₄ C. [Ni(CN)₄]²⁻ D. [Ni(H₂O)₆]²⁺ E. Ni(PPh₃)₄
Predict the major product 'P' in the following sequence of reactions: (i) HBr, benzoyl peroxide (ii) KCN (iii) Na (Hg)/C₂H₅OH
Match List-I with List-II. List-I (Ion) List-II (Group Number in Cation Analysis) A. Co²⁺ I. Group-I B. Mg²⁺ II. Group-III C. Pb²⁺ III. Group-IV D. Al³⁺ IV. Group-VI
Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar, K⁺, Cl⁻, Ca²⁺ and S²⁻ are all isoelec
The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n = 2 → n = 3 and n = 4 → n = 6 transitions, respectively, is: