IIT JAM Chemistry - MCQ Test 5

In the synthesis of ammonia by Haber process, if 60 moles of ammonia is obtained in one hour, then the rate of disappearance of Nitrogen is:

For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation The pre-exponential factor A and the activation energy E_a, respectively, are:

In the case of alkali metals, the covalent character decreases in the order:        

Which of the following does not illustrate the anomalous properties of lithium

On heating anhydrous Na₂CO₃.........is evolved:        

Which of the following sulphates have the highest solubility in water:        

The element that does not show catenation among the following p-block elements is:        

A quantity of 0.50 mole of an ideal gas at 20°C expands isothermally against a constant pressure of  2.0 atm from 1.0 L to 5.0 L. Entropy change of the system is:           

Given the molecular formula of the hexa-coordinated complexes (A) CoCl₃.6NH₃ (B) CoCl₃.5NH₃   (C) CoCl₃.4NH₃. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:

Ketones react with Mg-Hg over water gives           

Which one of the following statement for order of reaction is not correct:

t_1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is K, the t_1/4 can be written as:

The compound that undergoes decarboxylation most readily under mild condition is:

Consider the acidity of the carboxylic acids:

(I) PhCOOH 
(II) o-NO₂C₆H₄COOH 
(III) p-NO₂C₆H₄COOH
(IV) m-NO₂C₆H₄COOH

 Which of the following order is correct:

Starting with one mole of a compound A it is found that the reaction is 3/4th complete in one hour. If the reaction is first order, the rate constant is:           

Find the organic acid produced from the below reaction:

The diketone   on intramolecular aldol condensation gives the final product.

Nitrogen forms how many oxide?           

Which of the following does not have optical isomer           

Which one is not correct:           

Which of the following complex ions is expected to absorb visible light:           

The reaction [Fe(CNS)₆]^3– → [FeF₆]^3– takes place with

The crystal field stabilization energy (CFSE) is the highest for:           

The product X is           

An optically active compound having molecular formula C₈H₁₆ on ozonolysis gives acetone as one of       the products. The structure of the compound is:

The major organic product formed from the following reaction:

For the redox reaction

The correct coefficients of the reaction for the balanced reaction are:

For a first order reaction:           

The following statement(s) is(are) correct:           

For the first order reaction

            2N₂O₅(g) → 4NO₂ (g) + O₂ (g)

The rate of law for the reaction 

RCI + NaOH → ROH + NaCl

is given by rate = k[RCl]. The rate of this reaction

For the reaction

The correct statement(s) in the balanced equation is/are:

Reduction of the metal centre in aqueous permangnate ion involves:           

In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to:           

In which of the following arrangements the sequence is not strictly according to the property written against it:           

Which one of the following is wrongly matched:           

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal   Ni(II). Which of the following statement is/are true:           

If the activation energy for the forward reaction is 150 kJ mol^–1 and that of the reverse reaction is 260 kJ mol^–1, what is the enthalpy change (kJ mol^–1) for the reaction:

The rate of a reaction is doubled for every 10°C rise in temperature. The increase in reaction rate as a result of temperature rise from 10°C to 100°C is:

Cyclopropene rearranges to form propene

This follows first order kinetics. The rate constant is 2.714 × 10^–3 sec^–1. The initial concentration   of cyclopropane is 0.29 M. What will be the concentration (M) of cyclcopropene after 100 sec:          

A gaseous hypothetical chemical equation 2A → 4B +C is carried out in a closed vessel. The concentration of B is found to increase by 5 × 10^–3 mol l^–3 in 10 second. The rate of appearance of B is(mol l^–3 sec^–1):

1 mole of an ideal gas for which C_V = 3/2 R is heated reversibly at a constant pressure of 1 atm from  25°C to 100°C. The ΔH(cal) is:

The number of isomers possible for distributed borazine, B₃N₃H₄X₂ is:

The possible number of optical isomers in [Co(en)₂Cl₂]⁺ are:

The magnetic moment of a transition metal ion is BM. Therefore the number of unpaired electrons present in it is:

The spin only magnetic moment value (in Bohr magneton units) of Cr(CO)₆ is:

The total number of possible isomers for the complex compound [Cu^II(NH₃)₄][Pt^IICl₄] are:

The decomposition of    Proceeds as a first order reaction with a half-life period of 30 seconds at a certain temperature. If the       initial concentration [N₂O₅] = 0.4 M, what is the rate constant of the reaction(sec^-1):

If a substance with half life 3 days is taken at other place in 12 days. What amount of substance   is left now:

The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is:

The rate of disappearance of SO₂in the reaction 2SO₂ + O₂ → 2SO₃ is 1.28 × 10^–3 g/sec then the rate of formation (g/sec) of SO₃ is:1.28 × 10^–3

Number of P-O bonds in P₄O₁₀ is:

Heat obtained due to expansion of 1 mole of H₂ gas at 1000 K from 10 L to 100 L under isothermal        reversible condition is absorbed by an engine having a sink at 300 K. Useful work (cal) obtained is:

At constant pressure 200 g of water is heated from 10°C to 20°C. Thus, increase in entropy is (molar heat capacity of water (Joules) at constant pressure is 75.3 JK^–1 mol^–1):

Carnot cycle is said to have 25% efficiency when it operates between T (source) and 300 K (sink), Temperature T is (in K):

The value of log₁₀ K for the reaction A <=> B is (Given, Δ_tH°_{298 K} = – 54.07 kJ mol^–1,  Δ_tS°_{298 K} = 10 JK^–1 mol^–1, R = 8.314 JK^–1 mol^–1; 2.303 × 8.314 × 298 = 5705):

1 mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27°C.  The work done is 3 kJ. The final temperature (K) of the gas is equal to (C_V = 20 J mol^–1K^–1):