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18101.

Which is (are) amorphous solids?

Answer»

Rubber
Plastics
Glass
All

Answer :D
Discussion
18102.

What are the different types of RNA found in the cell ?

Answer»

SOLUTION : There are three types of RNAS :
(i)Ribosomal RNA (TRNA).
(ii) Messenger RNA (mRNA).
(iii)Transfer RNA (TRNA).
Discussion
18103.

Which of the following process not lead to formation of isobars?

Answer»

`1 alpha` particle and `2 beta` PARTICLES are emitted
Positron emission
`beta` particle `(`_(-1)e^(0))`` emission
K-electron capture

Solution :`_(X)A^(Z) rarr_(X-2)B^(Z-4)+`_(2)He^(4)``
`_(X-2)B^(Z-4) rarr `_(X-1)C^(Z-4)+ `_(-1)e^(0)```
`_(X-1)C^(Z-4) rarr `_(X)D^(z-4)+ `_(-1)e^(0)```
Discussion
18104.

Write the IUPAC nomenclature of the following complex along with its hybridisation and structure. K_(2)[Cr(NO)(NH_(3))(CN)_(4)], mu=1.73 BM

Answer»

Solution :`mu =sqrt(n(n+2))=1.73` which gives n = 1
This MEANS that CHROMIUM ion has one unpaired electrons, i.e., it is present as `Cr^(+)` or Cr (I). This implies that NO is present as nitrosonium ion. Hence, the NAME will be potassium amminetetracyanonitrosonium chromate (I)

In the complex, as there is only one unpaired electron and coordination number is 6, it will become

i.e., it will undergo `d^(2)sp^(3)` HYBRIDISATION to give octahedral geometry.
Discussion
18105.

Which of the following hydrocarbon is most stable?

Answer»




ANSWER :A
Discussion
18106.

Which of the following is not used in nail polish?

Answer»

CELLULOSE nitrate
Red dye
Acetone
Benzene

Solution :Benzene (a Carcinogenic) is not used as a solvent in NAIL POLISH.
Discussion
18107.

Write the monomers used for getting the following polymers. (i) Polyvinyl chloride (ii) Teflon (iii) Bakelite.

Answer»

SOLUTION :
Discussion
18108.

What happens when dialysis is prolonged ?

Answer»

Solution :The electrolytes STABILISE the colloidal solution. On prolonged dialysis, the traces of electrolytes are REMOVED completely that results in a COAGULATION of sol particles.
Discussion
18109.

Which of the following carbides gives methane on treatment with water ?

Answer»

Aluminium CARBIDE
IRON carbide
CALCIUM carbide
Silicon carbide

Answer :A
Discussion
18110.

X and Y are respectively :

Answer»




ANSWER :1
Discussion
18111.

The reagent that with nitromethane to form methylhydroxylamine is

Answer»

`Zn//HCl`
`Zn//NaOH`
`Zn//NH_(4)CL`
`Sn//HCl`

Solution :SEE reduction of NITRO compounds.
Discussion
18112.

Which of the following compound will not undergo azo coupling reaction reaction with benzene diazonium chloride.

Answer»

Aniline
Phenol
Anisole
Nitrobenzene

Solution :Diazonium cation is a weaker electrophile and HENCE REACTS with electron rich compounds containing electron donating groups such as `-OH,NH_(2) and -OCH_(3)` goups and not with compounds containing electron withdrawing groups such as `NO_(2)`, etc.
Discussion
18113.

What are the oxidation products of glycerol ?

Answer»

SOLUTION :Glycerol can give rise to a variety of OXIDATION products depending on the nature of the OXIDISING agent used for oxidation.
(i) Oxidation of glycerol with dil. `HNO_(3)` gives glyceric acid and tartronic acid.
(ii) Oxidation of glycerol with Conc. `HNO_(3)` gives mainly glyceric acid.
(iii) Oxidation of glycerol with bismuth nitrate gives as meso oxalic acid.
(iv) Oxidation of glycerol with `Br_(2)//H_(2)O` (or) NaOBr (or) Fenton reagent `(FeSO_(4) + H_(2)O_(2))` gives a mixture of glyceraldehyde and dihydroxy acetone (This mixture is named as GLYCEROSE).
Discussion
18114.

Which substance can be used for drying basic gases :

Answer»

`CaCO_3`
`Na_2CO_3`
`CaHCO_3`
CaO

Answer :D
Discussion
18115.

Which one of the following is used as an electrolyte in H_2O_2 fuel cell?

Answer»

AQUEOUS `CuSO_4`
Aqueous `CoO_2`
Aqueous `KOH`
`NH_4Cl + ZnCl_2`

ANSWER :C
Discussion
18116.

What is the position of d-block elements ?

Answer»

SOLUTION : d-block ELEMENTS are PLACED in between s-blockelements and p-block elements.
Discussion
18117.

Which of the following is a pseudohalogen :

Answer»

`ICL`
`ICl_2^-`
`(CN)_2`
`N_3^-`

ANSWER :C
Discussion
18118.

When KCl is heated with conc. H_(2)SO_(4) and solid K_(2)Cr_(2)O_(7), we get

Answer»

CHROMIC oxide
Chomous chloride
Chromyl chloride
Chloride

Answer :C
Discussion
18119.

Which sweetening agents are used to prepare sweets for a diabetic patient?

Answer»

SOLUTION :Artificial sweetening AGENTS such as,
(i) saccharin
(ii) ALITAME
(iii) Aspartame
can be used in preparing sweets for diabetic PATIENTS.
Discussion
18120.

Which of the following amine is optically active ?

Answer»

`CH_3NH_2`
`CH_3 NHCH_3`
Sec-butylamine
`CH_3CH_2 UNDERSET(CH_3)underset(|)N-C_2H_5`.

ANSWER :C
Discussion
18121.

The right order of the solubility of sulphates of alkaline earth metals in water is

Answer»

BegtCagtMggtBagtSr
MggtBegtBagtCagtSr
BegtMggtCagtSrgtBa
MggtCagtBagtBegtSr

Solution :Be GT MggtCa gt SR gt Ba
On moving down the the group lattice energy remains almost constant as the sulphate is so BIG that small increases in any size of the cations from Be to Ba does not make any difference. However the hydration energy decreases from `Be^(+2)` to `Ba^(+2)` . this causes decreases in the SOLUBILITY of the sulphates as the IONIC size increases.
Discussion
18122.

The salt which least likely to be found in minerals is

Answer»

SULPHATE
Acetate
Chloride
Sulphide

Answer :B
Discussion
18123.

To prevent corrosion, iron pipes carrying drinking water are coated with zinc. The process involved is:

Answer»

ALLOY formation
Electroplating
Galvanising
Soldering

Answer :C
Discussion
18124.

The species having pyramidal shape is :-

Answer»

`OSF_(2)`
`BrF_(3)`
`SiO_(3)^(-2)`
`SO_(3)`

ANSWER :A
Discussion
18125.

the units for the rate constant and the rate of reaction are same for a reaction .What will be the order reaction

Answer»

Second
ZERO
First
Third

Solution :For zero order reaction RATE LOW:R=K`[A]^(@)`
UNIT of K=mole/liter
Discussion
18126.

Which of the following order is/are correct?

Answer»

`Mg^(2+)("SIZE") GT Li^(+)` (size)
`S(E.A)gtO(E.A)`
`HG(I.E.) gt Cd(I.E)`
`P(I.E) gt S(I.E)`

Answer :B::C::D
Discussion
18127.

Write short notes on the following (i) Hoffmann's bromide reaction (ii) Ammonolysis (iii) Gabriel phthalimide synthesis (iv) Schoten-Baumann reaction v. Carbylamine reaction vi. Mustard oil reaction vii. Couplingreaction viii. Diazotisation ix. Gomberg reaction.

Answer»

Solution :i. Hoffmann.s bromide reaction:
When Amides are treated with bromine in the presence of aqueous or ethanolic solution of KOH, primary amines with one carbon atom less than parent amides are obtained.
`UNDERSET("amide")(R-)overset(O)overset(||)(C)-NH_(2)overset(Br_(2)//KOH)(to) underset("Primary amine")(R-NH_(2)+K_(2))CO_(3)+KBr+H_(2)O`
R=Alkyl (or) Aryl
(ii) Amkonolysis:
When Alkyl halides (or) benzylhalides are heated with alcoholic ammonia in a sealed tuber MIXTURES of `1^(@), 2^(@)` and `3^(@)` amines and quanternary ammonium salts are obtained.
`CH_(3)-Brunderset(Delta)overset(overset(..)(N)H_(3))(to) underset(1^(@)-"amine")(CH_(3)-overset(..)(N)H_(2))overset(CH_(3)-Br)(to) underset(2^(@)-"amine")((CH_(3))_(2)overset(..)(N)H)overset(CH_(3)Br)(to) underset(3^(@)-"amine")((CH_(3))_(3)overset(..)(N))overset(CH_(3)Br)(to) underset("Quarternary ammonium bromide")((CH_(3))_(4)overset(+)(N)Br^(-))`
(iii) Gabriel phthalimide synthesis
Gabriel synthesis is used for the preparation of Aliphatic amines. Phthalimide on treatment with ethanolic KOH forms potassium salt of phthalimide which on heating with alkyl halide followed by ALKALINE hydrolysis gives primary amine.

(iv). Schotten- Baumann reaction:
Aniline reacts with benzoylchloride `(C_(6)H_(5)COCl)` in the presence of NaOH to give acylation and benzoylation are nucleophilic substitutions.
`underset(("Aniline"))(C_(6)H_(5)-NH_(2))+underset(("Benzoylchloride"))(C_(6)H_(5)-overset(O)overset(||)(C)-Cl)overset(NaOH)(to) underset((N-"phenyl benzamide"))(C_(6)H_(5)-NH-overset(O)overset(||)(C)-C_(6)H_(5))+HCl`
v. Carbylamine reaction:
Aliphatic (or) aromatic primary amines react with chloroform and a alcoholic KOH to give isocyanides (CARBYLAMINES), which has an unpleasant smell. This reaction is knwon as carbylamines test. This test used to identify the primary amines.
`underset("Ethylamine")(C_(2)H_(5))-NH_(2)+underset("Chloroform")(CHCl_(3))+3KOH to underset("Ethylisocyanide")(C_(2)H_(5)-3KCl)+3H_(2)O`
(vi.) Mustard oil reaction:
When primary amines are treated wtih carbon disulphide (`CS_(2))`, N- alkyldithip carbonic acid is formed which on SUBSEQUENT treatment with `HgCl_(2)`, give an alkyl isothiocyanate.
`underset("Methylamine")underset(H)underset(|)(CH_(3)-N-H+)overset(S)overset(||)(C)=Stounderset("N-Methyl dithiocarbamic acid")(CH_(3)-NH-overset(S)overset(||)(C)-SH)overset(HgCl_(2))(to) underset("Methyl isothiocyanate" ("Mustard oil smell")) (CH_(3)-N=C=S)+HgS+2HCl`

vii. Coupling reaction:
Benzene diazonium chloride reacts with electron rich aromatic compounds like phenol, aniline to form brightly cooured azo compounds. Coupling generally occurs at the para position. If para position is occupied then coupling occurs as the ortho position. Coupling tendency is enhanced if an electron donating group is present at the para position to `-overset(+)(N_(2))Cl^(-)` group. This is an electrophilic substitutio.

viii. Diazotisation:
Aniline reacts with nitrous acid at low temperature (273-278K) to give benzene diazonium chloride which is stable for a short time and slowly decompose seven at low temperatures. This reaction is known as diazotization.

ix. Gomberg reaction
Benzene diazonium chloride reacts with benzene in the presence of sodium hydroxide to give biphenyl. This reaction in known as the Gomberg reaction.
Discussion
18128.

Which one of the following statements is FLASE?

Answer»

During ROASTING ,MOISTURE is REMOVED from the ore.
The ore is freed from almost all nonmetallic impurities.
Calcination of ore is carried out in the absence of any blast of air.
The concentrated ZINC blende is subjected to calcination zinc blende is subjected to calcination during its extraction by pyrometallurgy.

Solution :The concentrated zinc blende (sulphide ore)Is subjected to roasting not to calcination because calcination process is used fot carbonates ores WHEREAS roasting is used for sulphide ores.
Discussion
18129.

Write the chemical equation for the conversion of ethaneisonitrile to ethylamine.

Answer»

SOLUTION :`C_2 H_5 N overset( to )=C +2 H_2 O overset(to )= C_2 H_5 NH_2 +HCOOH `
Discussion
18130.

Which one of the following is the correct order of interactions?

Answer»

Covalentlthydrogen bondinglt van DER Waal's lt DIPOLE -dipole
VANDER Waal's lt hydrogen BONDING lt dipole - dipole lt covalent
vander Waal's lt dipole -dipolelt hydrogen bonding lt covalent
Dipole - dipole lt vander Waal's lt hydrogen bionding lt covalent.

Solution :The strength of the interactions follows the ORDER: vander Waals< hydroge-bonding
Discussion
18131.

What is Tollens' reagent ? Write one usefulness of this reagent.

Answer»

Solution :Ammoniacal SILVER nitrate solution is called Tollens' reagent. It is used to test ALDEHYDES. Both ALIPHATIC and aromatic aldehydes reduce tollen's reagent to shining silver mirror. It is also used to distinguish aldehydes from ketones.
`underset("Tollens' reagent")(2[Ag(NH_(3))_(2)]^(+))+underset("Aldehyde")(RCHO)+3OH^(-) OVERSET("heat")to underset("Silver mirror")(2Agdarr)+underset(Carboxylate ion")(RCOO^(-))+4NH_(3)+2H_(2)O`
Discussion
18132.

Which among the following is paramagnetic ?

Answer»

`Cl_(2)O`
`ClO_(2)`
`Cl_(2)O_(7)`
`Cl_(2)O_(6)`

Solution :`ClO_(2)` contains 7+12 i.e. 19 electrons (VALENCE) which is an odd number, i.e. there is (are) FREE electron(s). HENCE it is paramagnetic in nature.
Discussion
18133.

Which of the following is correct with respect to phosphodiester linkage ?

Answer»

5'-phopshate group of one nucleotide UNIT is JOINED to the 3'-hydroxyl group of ANOTHER nucleotide.
3'-phosphate group of one nucleotide unit is joined to the 5'-hydroxyl group of another nucleotide.
5'-phopshate group of one nucleotide unit is joined to the 5'-hydroxyl group of another nucleotide.
3'-phosphate group of one nucleotide unit is joined to the 3'-hydroxyl group of another nucleotide.

SOLUTION :5.-phopshate group of one nucleotide unit is joined to the 3.-hydroxyl group of another nucleotide.
Discussion
18134.

Which one of the following vitamins contains a metal atom:

Answer»

Riboflavin
VITAMIN `B_12`
Vitamin A
Vitamin`B_6`

ANSWER :B
Discussion
18135.

The unit of rate constant and that of rate of reaction are same for:

Answer»

FIRST order
Zero order
Second order
Half order

Answer :B
Discussion
18136.

What is the IUPAC name of HC -= C-CH_(2)-O-CH_(3)

Answer»

3-methoxy PROP - 1 - YNE
METHYL propanyl ether
ethenoxy ethyne
propyl methyl ether

Solution :3-methoxy prop - 1 - yne
Discussion
18137.

Which of following is incorrect ?

Answer»




ANSWER :D
Discussion
18138.

When iodine is dissolved in aqueous potassium iodide, the shape of the species formed is :-

Answer»

Linear
Angular
Triangular
See-Saw

Solution :`I_(2)+KI to KI_(3)`
In `I_(3)^(-)` HYB. is `SP^(3)d` with 3 lp so SHAPE is linear.
Discussion
18139.

The solubility of CaF_(2) is 2 xx 10^(-4) moles/litre. Its solubility product (K_(sp)) is

Answer»

`2.0 XX 10^(-4)`
`4.0 xx 10^(-3)`
`8.0 xx 10^(-12)`
`3.2 xx 10^(-11)`

Solution :`K_(sp)` for `CaF_(2) = 4S^(3) = 4 xx [2 xx 10^(-4)]^(3) = 3.2 xx 10^(-11)`.
Discussion
18140.

When KBr is treated with conc.H_2SO_4 a reddish-brown gas is evolved. The gas coming out is:

Answer»

`Br_2`
`Br_2 + HBR`
`H_2O_2`
`NO_2`

ANSWER :A
Discussion
18141.

Which salt will not impact colour to flame?

Answer»

LICL
`MgCl_2`
`CaCl_2`
KI

Answer :B
Discussion
18142.

Which of the following reaction is//are not showing the correct major product?

Answer»




SOLUTION :N//A
Discussion
18143.

Which of the following statements is not correct about order of a reaction ?

Answer»

The order of a reaction can be a fractional number.
Order of a reaction is experimentally determined quantity.
The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the BALANCED chemical equation for a reaction.
The order of a reaction is the sum of the powers of MOLAR concentration of the reactants in the rate LAW expression.

Solution :Order of reaction may or may not be equal to sum of stoichiometric coefficients. HENCE, ( C ) is not correct.
Discussion
18144.

Which of the following compound is not affected by acidic or alkaline KMnO_4?

Answer»




Both (2) &(3)

ANSWER :C
Discussion
18145.

Which one among the following is not an analgesic?

Answer»

Ibuprofen
Naproxen
ASPIRIN
Valium.

Answer :D
Discussion
18146.

What is possessed by pyrophosphoric acid ?

Answer»

FOUR hydroxylic group
`+3` OXIDATION of P
Five oxygen molecule
P - P bond

Solution :Four hydroxylic group Structure of pyrophosphoric ACID as FOLLOW:
Discussion
18147.

The uncertainty in the momentum of a particle is 2.5 xx 10^(-16)g cm s^(-1). With what accuracy can its position be determined ? (h= 6.625 xx 10^(-27) erg.s, i.e., g cm^(2)s^(-1))

Answer»

Solution :We have, `Delta x. Deltap= (h)/(4pi)`
or `Delta x= (h)/(4pi) xx (1)/(Delta p)`
`= (6.625 xx 10^(-27)g cm^(2) s^(-1))/(4 xx 3.14 xx (2.5 xx 10^(-16) g cm s^(-1)))`
`=2.11 xx 10^(-12)cm`
Discussion
18148.

What is the ore of zinc ?

Answer»

Haematite 
Copper PYRITES 
Zinc BLENDE 
BAUXITE 

Answer :C
Discussion
18149.

Why are halogens coloured ?

Answer»

Solution :All the halogens are coloured. The colour is due to the reason that their molecules absorb light in the VISIBLE region as a result of which their electrons get EXCITED to higher energy levels while the remaining light is transmitted. The colour of the halogens is actually the colour of this transmitted light. The amount of energy needed for excitation decreases progressively from F to I as the size of the ATOM increases. CONSEQUENTLY, the energy of the transmitted light goes on increasing form F to I. In other words, the colour of the halogens deepens from `F_(2)` to `I_(2)`. For example, `F_(2)` absorbs violet light (higher excitation energy) and hence appears pale yellow while iodine absorbs yellow and green light (lower excitation energy) and hence appears deep violet. Similarly, we can account for greenish yellow colour of `Cl_(2)` and orange RED colour of bromine.
Discussion
18150.

Which one is metalloid ?

Answer»

Tin
Germanium
Silicon
Carbon

Answer :B
Discussion