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9101.

Which of the following reactions is employed toproduce ozone in the laboratory ?

Answer»

Exposure of air to U.V. light lea
Reaction of `F_2` with `H_O` at low temperature
Reaction of `SO_2" with "H_2O_2`
Passage of SILENT electric discharge through `O_2`

Solution :Ozone is formed, when energy is supplied to dioxygen in the form of UV radiation or silent electric discharge.
`3O_(2_((g))) Leftrightarrow 2O_(3_((g))),DeltaH=142.7" kJ mol"^(-1)`
Since `O_3` is an endothermic molecule, so it is necessary to use a silent electric discharge, otherwise sparking would GENERATE heat and decompose it. This is the LABORATORY method.
a) Exposure of `O_2` of air UV light ALSO form `O_3`. This occurs in atmosphere, when photochemical smog is formed over cities like DELHI, Los Angeles or Tokyo.
(b). `2H_(2)O+2F_(2) to 4HF+O_(2)`
`3H_(2)O+3F_(2) to 6HF+O_(3)`
(c). `SO_(2)+H_(2)O_(2) to H_(2)SO_(4)`
Discussion
9102.

When equal weights of the two fertilizers, urea and ammonium sulphate are taken, urea contains

Answer»

Less nitrogen than ammonium SULPHATE
As MUCH nitrogen as ammonium sulphate
TWICE the AMOUNT of nitrogen present in ammonium sulphate
More than twice the amount of nitrogen present in ammonium sulphate

ANSWER :D
Discussion
9103.

Which catalyst is used in the hydroformylation of olefins? Give equation.

Answer»

SOLUTION :
Discussion
9104.

Which of the following compounds does not react with NaHSO_(3) ?

Answer»

`HCHO`
`C_(6)H_(5)COCH_(3)`
`CH_(3)COCH_(3)`
`CH_(3)CHO`

Answer :B
Discussion
9105.

Which of the following does not represent a correct set of nucleophile -

Answer»

`HS^(Ө),C_(2)H_(5)O^(Ө)`
`(CH_(3))_(3)N,OVERSET(Theta)overset(* *)(N)H_(2),overset(Theta)(C)N,`
`SO_(3),H_(2)O,overset(Theta)overset(* *)(C)H_(3)`
`CH_(3)-S-CH_(3),overset(Theta)(N)O_(2),overset(Theta)(I)`

Answer :C
Discussion
9106.

What meant by chelate ? Give an example.

Answer»

Solution :It is a complex compound in which atoms of same molecule form a cyclic ring with the central metal ION.
(i) Orthophenanthroline FORMS a five membered CHELATE with ferrous ion.
(ii) Ethylene diammine forms a chelate with nickelions.
Discussion
9107.

Which one of the following can distinguish propyne from propene :

Answer»

`Br_2` water
Ammoniacal `AgNO_3`
AQ.`kmnO_4`
DIL. `H_2SO_4`

ANSWER :B
Discussion
9108.

What are drugs? How are they classified?

Answer»

Solution :A drug is a substance that is used to modify or explore physiological systems or pathological states for the benefits of the recipient. It is used for the purpose of diagnosis, prevention cure or relief of a disease.
Classification of drugs:
Drugs care classified based on their proportions such as chemical structure, pharmacological effect, target system, site of action ETC.
(i) Classification based on the chemical structure:
`implies`In this classification, drugs with a common chemical skelton are classified into a single group. For example, ampicillin, amoxicillin, methiceillin etc. all have similar structure and are classified into a single group called penicillin.
`implies`Similarly we have other group of drugs such as opiates, steroids, catecholamines etc. Compounds having similar chemical structure are expected to have similar chemical properties. However, their biological actions are not always similar.
(ii) Classification based on the pharmacological effect:
`implies` In this classification, the drugs are grouped based on their biological effect that they produce on the recipient.
`implies` For example, the medicines that have the ability to kill the pathogenic BACTERIA are grouped as antibiotics.
`implies` This kind of grouping will provide the full range of drugs that can be used for a particular disease.
(iii) Classification based on the target system:
`implies`In this classification, the drugs are grouped based on the biological system (or) process that they target in the recipient.
`implies`This classification is more specific than the pharmacological classification.
`implies`For example, the antibiotics streptomycin and erythromycin inhibit the protein synthesis (target) in bacteria and are classified in a same group. However their mode of action is DIFFERENT
`implies`Streptomycin INHIBITS the initiation of protein synthesis, while erythromycin prevents THEINCORPORATION of new aminoacids to the protein.
(iv) Classification based on the site of action:
`implies`The drug molecule interacts with biomolecules such as enzymes, receptors etc, which are referred as drug targets.
`implies`We can classify the drug based on the drug target with which it binds.
`implies`This classification is highly specific compared to the others. These compounds often have a common mechanism of action, as the target is the same.
Discussion
9109.

The total number of covalent bonds present in one S_(8) molecule is

Answer»

4
6
8
10

Answer :C
Discussion
9110.

Which of the following elements can be involved in p pi-d pi bonding?

Answer»

Carbon
Nitrogen
PHOSPHORUS
BORON

SOLUTION :Phosphorus can FORM `p pi - d pi` bonds DUE to the presence of 3d-orbitals.
Discussion
9111.

When solid SnO_2 is added to an aqueous solution of NaOH, the

Answer»

VAPOUR pressure is lowered.
vapour pressure is raised.
osmotic pressure is increased.
BOILING point is raised.

Solution :`2Na^(+)(aq)+ 2OH^(-) (aq) + SnO_2(s) to 2Na^(+) (aq) + SnO_3^(-2) (aq) + H_2O`
The number of ions decreases in the ratio of 4 to 3, and so ALSO the colligative property.
Discussion
9112.

Which one of the following vitamin' is stored inRetinol?

Answer»

VITAMIN - `B_12`
Vitamin -A
Vitamin -C
Vitamin - D

Solution :Vitamin - D
Discussion
9113.

Which of the following formed during electrorefining of copper can yield gold:

Answer»

Cathode
Cathode mud
Anode mud
Electrolyte

Answer :C
Discussion
9114.

What is the structure of the major product when phenol is treated with bromine water?

Answer»




SOLUTION :Phenol has ACTIVATING (electron releasing) `-OH` group and bromine water supplies `Br^(+)` ion easily, hence under such conditions reaction does not stop at monobromo or DIBROMO stage but a fully brominated (2, 4, 6, - tribromophenol) COMPOUND is the final product.
Discussion
9115.

Which of the following statements is CORRECT regarding to the bonding in the anionic part of Na_(2)B_(2)O_(4)(OH)_(4)?

Answer»

both BORON atom are `sp^(3)` hybridised
Two peroxy LINKAGES are present
ONE boron is `sp^(2)` hybridised and other is `sp^(3)` hybridised
oxidation state of boronis +3

Answer :A
Discussion
9116.

What is the correct explanation of the non-reducing property of sucrose?

Answer»

`alpha`-D-glucopyranose and `BETA`-D-fructofuranose are linked via `C_(2) and C_(1)` centres respectively.
`alpha`-D-glucopyranose and `beta`-D-fructofuranose are linked via `C_(1) and C_(2)` centres respectively.
`alpha`-D-glucopyranose and `beta`-D-fructofuranose are linked via `C_(2) and C_(2)` centres respectively.
`alpha`-D-glucopyranose and `beta`-D-fructofuranose are linked via `C_(3) and C_(4)` centres respectively.

Solution :Sucrose is a non - reducing SUGAR because both glucose `(C_(1)-alpha)` and fructose `(C_(2)-beta)` are connected to each other through their reducing centres.
Discussion
9117.

Which of the following statement is correct for complex [Cr(NH_(3))(CN)_(4)(NO)^(2-)] (given that n=1) ?

Answer»

It is `d^(2)sp^(3)` hybridized.
The chromium is in `+1` oxidation state.
It is heteroleptic complex and its AQUEOUS SOLUTION is colourd .
All of these

Solution :`[overset(+1)(CR)(Noverset(0)(H)_(3))(Coverset(-4)(N))_(4) (Noverset(+1)(O))]^(2-),d^(2)sp^(3) , (t_(2g)^(2 , 2, 1) eg^(0,0))`
Discussion
9118.

Which of the following lanthanodie ion used as oxidizing agent ?

Answer»

only `TB ^(3+)`
only `Ce ^(2+)`
only `Ce ^(4+) and Tb ^(4+)`
only `Tb^(2+) and Dy_(3+)`

ANSWER :C
Discussion
9119.

Which one of the following permanga nometric titrations does not give satisfactory results ?

Answer»

`2KMnO_4 + 5H_2C_2O_4 + 3H_2SO_4 rarr ?`
`2KMnO_4 + 10 FeSO_4 + 8H_2SO_4 rarr ?`
`10 KL + 2KMnO_4 + 16HCl rarr ?`
`2KMnO_4 + 3 MnSO_4 + 2H_2O rarr ?`

Answer :C
Discussion
9120.

Using IUPAC norms write the systematic names of the following : (a) [Co(NH_(3))_(6)]CI_(3)(b) [Co(NH_(3))_(4)CI(NO_(2))]CI (c) [Ni(NH_(3))_(6)]CL_(2)(d) [Pt(NH_(3))_(2)CI(NH_(2)CH_(3))]CI (e) [Mn(H_(2)O)_(6)]^(2+)(f) [NiCl_(4)]^(2-) (g) [Co(en)_(3)]^(3+)(h) [Ti(H_(2)O)_(6)]^(3+) (i) Ni(CO)_(4) .

Answer»

SOLUTION :(a) hexaamminecobalt(III) chloride
(b) tetramminechloriodonitrito-N-cobalt(III) chloride
(c) hexamminenickel(II) chloride
(d) diamminechlorido (methaneamine) platinum(II) chloride
(E) hexaaquamanganese(II0 ion
(f) tetrachloridonickelate(II) ion
(g) tris(ethane-1, 2-diammine) cobalt(III) ion
(h) hexaaquatitanium(III) ion
(i) tetracarbonylnickel (0).
Discussion
9121.

Which of the following amines can be prepared by Gabriel synthesis ?

Answer»

ISOBUTYL amine
2-Phenylethylamine
N-methylbenzylamine
Aniline

Answer :A::B::D
Discussion
9122.

Which of the following is the weakest Brönsted base?

Answer»




`CH_(3)NH_(2)`

Solution :Due to delocalisation of lone pair of electrons on N - atom into BENZENE ring. `C_(6)H_(5)NH_2)` is the WEAKEST base.
Discussion
9123.

Which statements are right

Answer»

All AMINE are basic
Amines are purified by reaction with dil HCl
Amines are purified by reaction with dil.NaOH
Basic nature is DUE to presence of lone pair of ELECTRONS on N-atom

Solution :Electron pair donar base, `overset(..)N` has lone pair
Discussion
9124.

Which one of the following nuclear reaction is correct

Answer»

`._(6)C^(13) + ._(1)H^(1) rarr ._(7)N^(13) + BETA^(-) + v^(-)`
`._(11)Na^(23) + ._(1)H^(1) rarr ._(10)Ne^(20) + ._(2)He^(4)`
`._(13)Al^(23) + ._(0)n^(1) rarr ._(11)Na^(23) + E^(0)`
None of these

Solution :Equate mass NUMBER and atomic number on both sides.
Discussion
9125.

Which of the following cations are coloured in aqueous solution and why ? Sc^(3+), V^(3+), Te^(4+), Mn^(2+) ( At.Nos. Sc= 21, V = 23, Ti= 22, Mn =25)

Answer»

Solution :`SC^(3+)= 3d^(0)4s^(0)`( No unpaired ELECTRON), `V^(3+)= 3d^(2) 4s^(0) `( 2 unpaired electrons).Thus, only `V^(3+)` and `Mn^(2+)` are colouredbecause they have unpaired electrons.
Discussion
9126.

Which of the following is hypnotic drug?

Answer»

Luminal
Salol
Catechol
Chemisol

Answer :A
Discussion
9127.

The vapour pressure of water at 80^(@)C is 355 torr. A 100 ml vessel contained water-saturated oxygen at 80^(@)C, the total gas pressure being 760 torr. The contents of the vessel were pumped into a 50.0 ml. Vessel at the same temperature. What were the partial pressures of oxygen and of water vapour, what was the total pressure in the final equilibrated state? Neglect the volume of any water which might condense.

Answer»


ANSWER :`P_(O_(2))=810 MM Hg, P_(H_(2)O)=355 mm Hg, P_("total")=1165 mm Hg`
Discussion
9128.

What is the cell reaction occurring in Daniel cell (Galvanic cell)

Answer»

`Cu_((s))+ZnSO_(4(aq))toCuSO_(4(aq))+Zn_((s))`
`Zn_((s))+CuSO_(4(aq))toCu_((s))+ZnSO_(4(aq))`
`Ni_((s))+ZnSO_(4(aq))toNiSO_(4(aq))+Zn_((s))`
`2Na_((s))+CdSO_(4(aq))toNa_(2)SO_(4(aq))+Cd_((s))`

SOLUTION :In Daniel cell (copper/zinc galvanic cell), the spontaneous chemical reaction between zinc metal and aqueous copper (II) sulphate is conducted so as to OBTAIN the available chemical energy released in the form of electrical energy.
Discussion
9129.

Wrong statement about the polymer BuNa - S is

Answer»

BU' STANDS for 1,3 -butadiene
Na' stands for sodium (catalyst)
S' stands for STYRENE
It is used in MANUFACTURE of hoses

ANSWER :D
Discussion
9130.

What is the main reason for the fact that carboxylic acid can undergo ionization ?

Answer»

Absence of alpha - hydrogen
Resonance stabilization of the carboxylate ion
Highreactivity of alpha- hydrogen
Less reactivity of `alpha` - H ATOM

Solution :`RCOOH +H_(2)O to RCOO^(-)+H_(3)O^(+)`
Because of resonance stabilization of carboxylate ion, the equilibrium shifts in the forward direction , thereby forming more and more of hydronium IONS.
Discussion
9131.

Which oxide is neutral ?

Answer»

`N_2O`
`NO_2`
`P_2O_5`
`Bi_2O_3`

ANSWER :A
Discussion
9132.

Write the IUPAC name of [Cr(NH_3)_5 (NCS)][ZnCl_4].

Answer»

SOLUTION :PENTA ammine isothiocyanato CHROMIUM (III) tetra-chloro ZINCATE (II).
Discussion
9133.

When a system is takenfrom state A and B along thepathACB, 80J of heat flows into the system andthe system does30 J of work . (a) How muchheatflowsintothe systemalongpathADBif theworkdoneby the system is 10? (b)Whenthe systemis returnedfrom stateB to A along curvedpath, the workdoneon the systemis 20J. Does the systemabsorbor liberate heat, andhowmuch? (c)If U_(D)- U_(A) = 40J, findthe heatabsorbed in theprocessAD and DB

Answer»


Solution :`""DeltaU = 80-30=50`
`""DeltaU` is state function
(a)`""DeltaU = q + W`
`""50=q -10`
`""or q=60J`
(b)`""DeltaU = -50`
`""DeltaU = q +w`
`""q = DeltaU- w = -70`
(c)`""DeltaU_(ABD) =DeltaU_(AD) + DeltaU_(DB)`
`""50 = 40 + DeltaU_(DB)`
`""DeltaU_(DB) = 10`
`""DeltaU_(DB)= q +w`
`""10 = q + 0 ["Vol. const".]`
`""q = 10 J`
`"""Total workin "W_(ADB)= -10`
`""W_(AD)+ W_(DB) = - 10`
`""W_(AD) = -10`
`""DeltaU_(AD) = q +w`
`""40 = q -10`
`""q = 50`
Discussion
9134.

Write the structues of te product of the following reactons. (iii) CH_3-C-=CH overset(Hg^(2+)H_2SO_4)rarr

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_009_S01##)`
Discussion
9135.

Which of the following statements related to crystal field splitting in octahedral coordination entities is incorrect?

Answer»

The `d_(x)^(2)-d_(y)^(2) and d_(Z)^(2)` ORBITALS has more energy is compared to `d_(xy),d_(yz) and d_(xy)` orbitals.
Crystal field splitting energy `(Delta_(a))` depends directly on the charge of the METAL ion and on the field produced by the ligand.
In the presence of `Br^(-)` as a ligand the distribution of electrons for `d^(4)` configuration will be `t_(2)^(3)g,e_(g)^(1)`,
In the presence of `CN^(-)` as a ligand `Delta_(@) LT P`.

Solution :`CN^(-)` is a strong field ligand and form low spin complexes thus `Delta_(a) GT P`.
Discussion
9136.

Which of the following is the most stable diazonium salt?

Answer»

`C_(6)H_(5)CH_(2)N_(2)^(+)X^(-)`
`CH_(3)N_(2)^(+) X^(-)`
`CH_(3)CH_(2)N_(2)^(+)X^(-)`
`C_(6)H_(5)N_(2)^(+)X^(-)`

SOLUTION :Benzene diazonium SALT is most stable due to resonance.
Discussion
9137.

Which one of the following polymers belongs to the class of addition polymers ? Which catalyst is used to prepare its monomer form ethanol ? i. PHBV ""ii. Polyethene iii.Nylon-6 ""iv Dextron

Answer»

`"i", K_(2)Cr_(2)O_(7)`
iv.`K_(2)Cr_(2)O_(7)`
`II. Al_(2)O_(3)`
iii. `Al_(2)O_(3)`

Answer :D
Discussion
9138.

What is genetic code ?

Answer»

Solution :It is the relation between the NUCLEOTIDE TRIPLETS and the amino ACIDS.
Discussion
9139.

Which of the following reactions are used in the preparation of alcohols ?

Answer»

`CH_(3)CH_(2)Br+aq. KOH RARR`


`CH_(3)CH_(2)Cloverset(H_(2)O)rarr`

Answer :A::B::C
Discussion
9140.

Two reaction A to products and B to products have rate constants k_A and K_Bat temperature, T and activation energies E_A and E_B respectively. If K_A gt K_B& and E_A lt E_B and assuming that A for both the reactions is same then:

Answer»

At HIGHER TEMPERATURE `k_A` will be GREATER than `K_B` and `K_AgtK_B`
At LOWER temperature `k_A` and `k_B` will differ more and `K_AgtK_B`
As temperature rises `k_A` and `K_B` will be close to each other in magnitude
All

Answer :D
Discussion
9141.

What is 'B' in the following reaction ? CH_(3) - CN underset((ii) H_(3)O^(+)) overset((i) Sn Cl_(2) + HVl) toA overset(Na_(2)CO_(3)) to B

Answer»

`CH_(3) - underset(OH) underset(|) (CH) - CH_(2) -CH_(3)`
`CH_(3) - underset(OH) underset(|) (CH) - CH_(2) - CHO`
`CH_(3) - CH_(2) - COONA`
`CH_(3) - CH_(2) - ONa`

Answer :B
Discussion
9142.

Which of the following is not precipitate by H_(2)S in presence of cone acid soln

Answer»

`Cu^(2+)`
`AL^(3+)`
`SB^(3+)`
`Cd^(2+)`

ANSWER :B,d
Discussion
9143.

Which oxide is of different type than others?

Answer»

`MnO_2`
`PbO_2`
`TiO_2`
`Na_2O_2`

ANSWER :D
Discussion
9144.

Though copper, silver and gold atoms have completely filled sets of d-orbitals, yet they are considered as transition metals. Why?

Answer»

Solution :Cations of these ELEMENTS `(CU^(2+), AG^(2+), AU^(3+))` have partially filled sets of d-orbitals.
Discussion
9145.

What is the effect of pH on the solution ofK_(2)Cr_(2) O_(4)solution ?

Answer»

Solution :`K_(2)Cr_(2)O_(4)` solutionchangeinto `k_(2)Cr_(2) O_(7) // `yellowcolourchangesintoorangecolour
Discussion
9146.

Which of the following is a false statement

Answer»

Fluorine is more ELECTRONEGATIVE than CHLORINE
nitrogen has greater `IE_(1)` than oxygen
Lithium is amphoteric
Chlorine is an OXIDIZING agent

SOLUTION :Lithium is basic in natuer and hence it is not amphoteric.
Discussion
9147.

Which pairs represent isoelectronic species ?

Answer»

`NA^+, MG^+`
`Na, Mg^+`
Na, Mg
`Na, Mg^(2+)`

ANSWER :B
Discussion
9148.

which of the following mode of expressing the concentration is independent of temperature? Molality,Normality,Formality,Molarity

Answer»

Molarity
Molality
Formality
Normality

Answer :B
Discussion
9149.

Write structures of the products A,B,C,D and E in the following scheme

Answer»
Discussion
9150.

The structure of IF_2 is -

Answer»

SQUARE pyramid
trigonal BIPYRAMID (C) octahedral
octahedral
PENTAGONAL bipyramid

Solution :The structure is pentagonal bipyramidal having `sp_3d_3` hybridisation as given below :
Discussion