AIIMS Chemistry Mock Test - 1
60 Questions MCQ Test AIIMS Mock Tests & Previous Year Papers | AIIMS Chemistry Mock Test - 1
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When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is
The maximum amount of BaSO4 that can be obtained on mixing 0.5 mole BaCl2 with 1 mole H2SO4 is
Which reaction sequence would be best to prepare 3-choloraniline from benezene ?
Benzene reacts with CH₃COCl in the presence of AlCl₃ to give
Which of the following is formed when toluene reacts with fuming nitric acid?
Nitration of toluene using fuming HNO3 and conc. H2SO4 gives Trinitrotoluene
Isoelectronic refers to molecules, ions or atoms that have the same count of valence electrons and the same electronic structure.
Now,
The atomic number of O₂ = 8
The atomic number of C = 6
The atomic number of H = 1
The atomic number of N = 7
We are given with,
C2H4 = 2×6 + 4×1 = 16 electrons
O₂⁺ = 2×8-1 = 15 electrons
CN⁻ = 1×6 + 1×7 +1 = 14 electrons
N₂⁺ = 2×7 -1 = 13 electrons
O₂ = 2×8 = 16 electrons
As we can see that, C2H4 and O₂ have same number of electrons, hence they are isoelectronic.
What is the rate of a reaction in mol-L⁻1-s⁻1in a first order reaction, if its half-life period is 693 s, and its concentration is 2 mol-L⁻1?
The effect of temperature on the rate constant is given by
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): PbS is roasted in air and when it is partially converted into oxide, it is further heated in absence of air.
Reason(R): Excess air can form higher oxides.
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): Hard water is more suitable than soft water for laundary and dying.
Reason(R): Hard water can be used in steam boilers.
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): Inversion of cane sugar is catalysed by invertase from yeast.
Reason(R): The conversion of starch into maltase is catalysed by diastase.
Two moles of an ideal gas are compressed at 300 K from a pressure of 1 atm to a pressure of 2 atm. The change in free energy is
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 the volumetric estimation of iron (II) in acid solution in the presence of excess chloride by titration with permaganate solution , excess phosphoric acid and manganese (II) sulphate are added to the solution containing iron (II) before the titration .
Reason(R): Phosphoric acid complexes the iron (III) produced by the oxidation , and manganese (II) depresses the reduction potential of permanganate.
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 caogulating AS2 , S3 , Al3 + ions an better than Na⁺ ions.
Reason(R): Size of Al3 + is smaller than Na⁺.
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) : Mercuric chloride is known as corrosive sublimate.
Reason(R) : Mercuric chloride is extremely poisonous substance.
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): Sulphur cross links are present in vulcanised ruber.
Reason(R): Vulcanisation is a free radical initated chain reaction.
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): Addition of NH4OH to an aqueous solution of BaCl2 in the presence of NH4Cl(excess) precipitates Ba(OH)2.
Reason(R): BA(OH)2 is insoluble in water
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): Sedatives are given to patients who are mentally agitated and violet.
Reason(R): Sedatives can suppress the activities of central nervous system .
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): Annulene is not aromatic though it contains Huckel number of π-electrons.
Reason(R): Steric interaction between internal hydrogens makes it non-planar.
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): SeCl4 does not have tetrahedral structure
Reason(R): Se in SeCl4 has two lone pairs
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): The molality of a solution changes with change in temperature.
Reason(R): The molality is moles of substance dissolved 1 kg of solvent.
The correct answer is D: Assertion is false but reason is true.
By the definition and properties of molality.
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):H⁺ ion has a very high polarising power.
Reason(R):Size of H⁺ ion is very 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):Baeyer's process the only concentration method used for aluminium.
Reason(R):Red bauxite contains iron oxide which is removed in Baeyer's process.
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): Antiseptics can be applied to living tissues.
Reason(R): Iodine is a well known antiseptic.
B is the correct answer. By definition.
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): d-orbital is double dumbell orbital is 0,1,2.
Reason(R): The allowed value of l for d-orbital is 0,1,2.
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): Propadiene is optically active.
Reason(R): Propadiene has a plane of symmetry.
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): SiO2 exists in both crystalline and amorphous form.
Reason(R): Quartz is crystalline form and obisdian is its amorphous form.
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): C2H5Br reacts with alcoholic solution of AgNO2 to form nitroethane as the major product.
Reason(R): NO2- is an ambident ion.
The time required to deposit one millimole of aluminum metal from Al₂O₃, by passing 9.65 amperes through aqueous solution of aluminum ion is
The element, which forms oxides in all oxidation states + 1 to + 5, is
In van der Waal equation of state about gas laws,the constant b is a measure of
Among KO₂, AlO₂-, BaO₂ and NO₂⁺, unpaired electron is present in
Which is manufactured by electrolysis of fused NaCl?
Which of the following atoms will have the smallest size?
Which of the following could act as a propellant for rockets ?
Which of the following will act as Lewis base, nucleophilic reagent as well as ligand in complex compound ?
The aqueous solution of which of the following salt has the lowest pH value?
Which of the following is a method of converting a ketone to hydrocarbon with same number of carbon atoms?
Which alkene is formed from the following ylide carbonyl pair CH₃CH₂CH₂CH = PPh₃ + 2-Butanone
Which has maximum stabilisation energy as a result of resonance?
Electrophile N ⊕O2 attacks the following
In which cases N ⊕O2 will be at meta-postition?
Intermediate electrophile in the following reaction is :
Correct Answer :- b
Explanation : Rate of Electrophilic Addition is directly proportional to the carbonation.
(CH3)2 C⊕CH2CH3 is the most stable as it is a tertiary carbocation. Stability of carbocation increases with the number of alkyl groups bonded to the charge-bearing carbon.
3o carbocation has more hyperconjugation effect with 9α− hydrogens and thus, is more stable.
Which of the following is the second most abundant element in the earth's crust?
Which of the following is not a crystalline solid ?
The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of a non-volatile solute and 0.8 mol of solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature will be
Which of the following has asymmetric carbon atoms?
The concentration in gms per litre of a solution of cane sugar (M=342) which is isotonic with a solution containing 6 gms of urea (M=60) per litre is
Cuprous ion is colourless while cupric ion is coloured because
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