AIIMS Chemistry Mock Test - 8

Which of the following is not a nucleophile?

The structure of benzene is

Aromatic compounds undergo

Freon is used as a

The compound used as refrigerant is

The deecomposition of hydrogen peroxide 2H₂O₂ → 2H₂O + O₂ is a

Among the following, the paramagnetic compound is

An increase of temperature from 500 K to 510 K increases the number of bimolecular collisions by about__

Which one of the following statement is false?

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Ferrocene is an example of π-complex.
Reason(R): Iron and C₅H₅ ring double bond.

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-

Statement-1: Glucose gives a reddish-brown precipitate with Fehling’s solution.
Statement-2: Reaction of glucose with Fehling’s solution gives CuO and gluconic acid.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): One mole of oxygen gas contains 2 x 6.023 x 10²³ atoms of oxygen , whereas one mole of organ contains 6.023 x 10²³.
Reason(R): Oxygen is a diatomic gas, O₂ whereas argon is a monatomic gas.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): For the reaction
2N₂O₅ → 4NO₂ + O₂ ,
Rate = K[N₂O₅].
Reason(R): Rate of decomposition of N₂O₅ is determined by slow step.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Oils contain higher proportion of glycerides of saturated fatty acids.
Reason(R): Oils contain a higher percentage of olein.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): LiCl is predominantly covalent in character.
Reason(R): Electronegativity difference between Li and Cl is too small.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Para-hydrogen has lower internal energy and is favoured at high temperature.
Reason(R): The thermal conductivity of para-hydrogen is lesser than that of ortho-hydrogen.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Benzene undergoes many electrophilic substitution reactions like acetylation.
Reason(R): The benzene ring rotates freely to form substituted compounds.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): During an adiabatic process, heat energy is not exchanged between system and surroundings.
Reason(R): The temperature of gas increases when it undergoes an adiabatic expansion.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Phenol reacts with chloroform and aqueous alkali followed by acid hydrolysis to yield salicylaldehyde.
Reason(R): It involves the formation of carboncations.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): KMnO₄ is purple in colour due to charge transfer.
Reason(R): MnO₄^- ion is tetrahedral in shape.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):In an acid-base titration involving strong base and a weak acid. methyl orange can be used as an indicator.
Reason(R):Methyl orange changes its colour in the pH range 3 to 5.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Cu²⁺ is less stable than Cu⁺.
Reason(R): cu⁺ is diamagnetic .

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Lower members of aldehydes and ketones are miscible with water.
Reason(R): Solubility of carbonyl compounds increases with increase in molecular weight.

In the following question, a Statement-1 is given followed by a corresponding Statement-2 just below it. Read the statements carefully and mark the correct answer-
Statement-1:
Alkali metals dissolve in liquid ammonia to give blue solutions.
Statement-2:
Alkali metals in liquid ammonia give solvated species of the type [M(NH₃)_n]⁺ (M = alkali metals).

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Trans[Co(en)₂Br₂]Cl does not show optical activity.
Reason(R): Above coplex can exhibit ionisation isomerism.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):Nitrophenol is stronger acid than phenol.
Reason(R):Nitro group is electron withdrawing group and hence stabilises the anion formed.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Alkylation of benzene by Friedal-Craft reaction gives polyalkylated compounds.
Reason(R): The ring gets activated for further substitution after the introduction of one alkyl group.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Nitriding is a process of heating steel in an atmosphere of nitrogen.
Reason(R): Steel becomes brittle after nitriding.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Mountaineers have to carry oxygen cylinders to avoid altitude sickness.
Reason (R): At altitudes as atmospheric pressure is low, air is less dense and less oxygen is available for breathing. this is explained by boyle's law.

A smuggler could not carry gold by chemically depositing iron on the gold surface since

When electricity is passed through aqueous solution of aluminium chloride, 13.5 g of Al are deposited. The number of faradays of electricity passed must be

A gas can be liquefied

Sodium metal cannot be stored under

Sodium nitrate decomposes above 800ºC to give

Which of the following imparts violet colouration to the Bunsen burner nonluminous flame?

Which of the following species has four lone pairs of electrons?

Plaster of Paris hardens by

Speed of decomposition of H₂O₂ is reduced by

The pH of blood does not appreciably change by a small addition of acid or a base because blood

A pH of 7 signifies

Which buffer solution out of the following will have pH > 7?

Which of the following is the strongest acid?

Acetone is easily oxidised with

The IUPAC name of acetone is

Intermediate electrophile in the following reaction is :
 

Arrange these compounds in order of increasing S_N2 reaction rate :

E2 reaction is called:

To obtain pure silicon, SiH₄ is heated at

Ultra-silicon is prepared by the process of

The edge length of face centred unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

There is formation of precipitate almost instantly when alcoholic AgNO₃ reacts with

At 25^oC, the highest osmotic pressure is exhibited by 0.1 M solution of

Volume of 0.1 M K₂Cr₂O₇ required to oxidise 35 ml of 0.5 M FeSO₄ solution is

At room temperature, the mole fraction of a solution is 0.25 and the vapour pressure of the solvent is 0.80 atm. Then the lowering of vapour pressure is

A metal oxide is reduced by heating it in a stream of hydrogen. It is found that after complete reduction, 3.15 g of the oxide has yielded 1.05 g of the metal. We may deduce that

On addition of NH₄OH to a copper sulphate solution?

Which diagram describes the energy changes for rotation about the 2 - 3 bond of 2, 3 - dimethyl butane?