AIPMT Mains Chemistry Class 12 Questions
71 questions
Activation energy (Eₐ) and rate constants (k₁ and k₂) of a chemical reaction at two different temperatures (T₁ and T₂) are related by:
Standard reduction potentials of the half reactions are given below: F₂(g) + 2e⁻ → 2F⁻ (aq) ; E° = +2.85 V Cl₂(g) + 2e⁻ → 2Cl⁻ (aq) ; E° = +1.36 V Br₂(l) + 2e⁻ → 2Br⁻ (aq) ; E° = +1.06 V I₂(s) + 2e⁻ → 2I⁻ (aq) ; E° = +0.53 V The strongest oxidising and reducing agents respectively are:
Vapour pressure of chloroform (CHCl₃) and dichloromethane (CH₂Cl₂) at 25°C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl₃ and 40 g of CH₂Cl₂ at the same temperature will be: (Molecular mass of CHCl₃ = 119.5 u and molecular mass of CH₂Cl₂ = 85 u).
Molar conductivities (Λ°) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. Λ° for CH₃COOH will be:
Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true?
Low spin complex of d⁶-cation in an octahedral field will have the following energy: (Δ₀ = Crystal Field Splitting Energy in an octahedral field, P = Electron pairing energy)
Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E°_{M²⁺/M}) value has a positive sign?
In the replacement reaction RCl + MF → RF + MCl The reaction will be most favourable if M happens to be:
The catalytic activity of transition metals and their compounds is ascribed mainly to:
Which of the following exhibit only +3 oxidation state?
The Gibbs' energy for the decomposition of Al₂O₃ at 500°C is as follows:
The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500°C is at least:
Consider the following reaction:
![Diagram showing reaction: Benzoyl chloride (C₆H₅COCl) with H₂ and Pd⁻BaSO₄ to form 'A']
The product 'A' is:
An organic compound (C₃H₉N) (A), when treated with nitrous acid, gave an alcohol and N₂ gas was evolved. (A) on warming with CHCl₃ and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure of (A).
Consider the reaction: RCHO + NH₂NH₂ → RCH = N–NH₂ What sort of reaction is it?
Which of the following compounds will give a yellow precipitate with iodine and alkali?
Which of the following compounds can be used as antifreeze in automobile radiators?
For its activity, carboxypeptidase requires:
Which one of the following biomolecules is correctly characterised?
Match list-I with List-II for the composition of substances and select the correct answer using the code given below the lists
An organic compound 'A' on treatment with NH₃ gives 'B' which on heating gives 'C' when treated presence of KOH produces ethylamine. Compound with Br in the 'A' is
A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86°C/m, the freezing point of the solution will be
The unit of rate constant for a zero order reaction is
A solution contains Fe²⁺, Fe³⁺ and I⁻ ions. This solution was treated with iodine at 35°C. E° for Fe³⁺/Fe²⁺ is +0.77 V and E° for I₂/2I⁻ = 0.536 V. The favourable redox reaction is
200 mL of an aqueous solution of a protein contains its 1.26 g. The Osmotic pressure of this solution at 300 K is found to be 2.57 × 10⁻³ bar. The molar mass of protein will be (R = 0.083 L bar mol⁻¹ K⁻¹)
The rate of the reaction 2N₂O₅ → 4NO₂ + O₂ can be written in three ways: -d[N₂O₅]/dt = k[N₂O₅], d[NO₂]/dt = k'[N₂O₅], d[O₂]/dt = k''[N₂O₅]. The relationship between k and k' and between k and k'' are
The half life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L⁻¹ to 0.04 mg L⁻¹ is
Which of the following complex compounds will exhibit highest paramagnetic behaviour?
Which of the following is not a fat soluble vitamin?
Which of the following carbonyls will have the strongest C – O bond?
The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (1–4) the components of reaction labelled as A, B, C and D are identified correctly?
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al₂(SO₄)₃? Given that Λ₀Al³⁺ and Λ₀SO₄²⁻ are the equivalent conductances at infinite dilution of the respective ions?
Among the following four compounds a. Phenol b. Methyl phenol c. Metanitrophenol d. Paranitrophenol
The acidity order is
Consider the following relations for emf of an electrochemical cell (a) emf of cell = (Oxidation potential of anode) – (Reduction potential of cathode) (b) emf of cell = (Oxidation potential of anode) + (Reduction potential of cathode) (c) emf of cell = (Reductional potential of anode) + (Reduction potential of cathode) (d) emf of cell = (Oxidation potential of anode) – (Oxidation potential of cathode)
Which of the above relations are correct?
When glycerol is treated with excess of HI, it produces
Some statements about heavy water are given below a. Heavy water is used as a moderator in nuclear reactors b. Heavy water is more associated than ordinary water c. Heavy water is more effective solvent than ordinary water Which of the above statements are correct?
Which one of the following compounds will be most readily dehydrated?
The rate of the reaction 2NO + Cl₂ → 2NOCl is given by the rate equation rate = k[NO]²[Cl₂]. The value of the rate constant can be increased by
Which one of the following complexes is not expected to exhibit isomerism?
Which of the following conformers for ethylene glycol is most stable?
Which of the following oxidation states is the most common among the lanthanoids?
How many bridging oxygen atoms are present in P₄O₁₀?
Following compounds are given a. CH₃CH₂OH b. CH₃COCH₃ c. CH₃—CHOH │ CH₃ d. CH₃OH Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?
Fructose reduces Tollen’s reagent due to
In the following reaction C₆H₅CH₂Br — 1. Mg, Ether → X, 2. H₃O⁺ the product ‘X’ is
Given:
(i) Cu²⁺ + 2e⁻ → Cu, E° = 0.337 V
(ii) Cu²⁺ + e⁻ → Cu⁺, E° = 0.153 V
Electrode potential, E° for the reaction, Cu⁺ + e⁻ → Cu, will be:
For the reaction N₂ + 3H₂ → 2NH₃, if (d[NH₃]/dt = 2 × 10⁻⁴ mol L⁻¹ s⁻¹, the value of (-d[H₂]/dt would be :
Consider the following reaction,
In the reaction BrO₃⁻ (aq) + 5 Br⁻(aq) + 6H⁺ → 3 Br₂(l) + 3 H₂O(l). The rate of appearance of bromine (Br₂) is related to rate of disappearance of bromide ions as following:
A 0.0020 m aqueous solution of an ionic compound Co(NH₃)₅(NO₂)Cl freezes a.00732°C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (Kf = -1.86°C/m)
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