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8651.

Which is not emitted by radioactive substance ?

Answer»

`alpha`-rays
`BETA-`rays
Positron
PROTON

Solution :Proton is not emitted by RADIOACTIVE susbtances.
Discussion
8652.

Which one of the following compounds exhibits strongest hydrogen bonding:

Answer»

`R-O-R`
`R-CH_2OH`
`RCH_2NHCH_3`
`RNH_2`

ANSWER :A
Discussion
8653.

Which of the following is an optically inactive compound?

Answer»


Cis-1,2-dimethylcyclohexane

Answer :B
Discussion
8654.

Which one is not an example of redox reaction ?

Answer»

`Cl_2+2H_2O +SO_2 rarr4H^+ +SO_4^(2-) +2Cl^-`
`CU^(2+) +Zn rarr Zn^(2+) +Cu`
`2H_(2) + O_(2) rarr 2H_2O`
`HCI + H_2O →H_3O^+ +CL^-`

ANSWER :D
Discussion
8655.

Which one of the following is not a close packing ?

Answer»

HCP
ccp
BCC
fcc

Solution :bcc is not as CLOSE packing arrangment as hcp and ccp.
Discussion
8656.

Which of the following has maximum bond energy

Answer»

`O_(2)`
`O_(2) ^(+)`
`O_(2) ^(2-)`
`O^(2-)`

ANSWER :B
Discussion
8657.

Toluene overset(KOH+KMnO) to A overset(PVl_(5)) to B overset(CH_(3)COONa) to C. Product ' C is

Answer»

BENZOIC ethanoic unhydride
BENZOPHENONE
acetophenone
benzoquinone

Solution :`C_(6)H_(5) - CH_(3) overset(KOH +KMnO_(4)) to C_(6)H_(5) - COOH overset(PCl_(5)) to C_(6)H_(5) - COCl overset(CH_(3)COONa) to underset("benzoic ethanoic anhydride")(C_(6)H_(5) - COOOC- CH_(3)) `
Discussion
8658.

What is lanthanide contraction ? Explain the cause of lanthanide contraction. Draw the structures of chloroxylenol and adenine. How are ethylamine and ethyl methyl amine distinguished by using nitrous acid ?

Answer»

Solution :LANTHANOID contraction may be defined as gradual decrease in atomic and ionic radii of lanthanoids with the increase in atomic number.
Cause of lanthanoid contraction : As the atomic number of the members of lanthanoids sries increases the positive charge on nucleus increases by '+ 1' unit and one more electron ENTERS in the same 4f subshell. There is imperfect shielding of one electron by another electron in the same '4f' subshell. The extent of shielding for electrons is less in '4f' subshell as COMPARED to electrons in d subshell. 4f shells have diffused shapes. Hence, with increase of nuclear charge the valence shell is pulled slightly towards nucleus. As a RESULT of the pull the size of `M^(3+)` ions goes on decreasing.
Structure of chloroxylenol :

Ethylamine forms ethyl alcohol with nitrous acid whereas ethyl methyl amine gives N-nitrosoethyl-methyl amine nitrous acid.
(a) `underset("Ethyl amine")(C_(2)H_(5)-NH_(2))+underset("Nitrous acid")(HO-N=O)overset(NaNO_(2)+HCl)rarr underset("Ethyl alcohol")(C_(2)H_(5)-OH+N_(2)uarr) + H_(2)O`
(b) `underset(" Ethyl methyl amine")(C_(2)H_(5)-underset(CH_(3))underset("|")("N ")-H)+HO-N=O overset(NaNO_(2)+HCl)rarr underset("N-nitroso ethyl-methyl amine")(C_(2)H_(5)-underset(CH_(3))underset("|")("N ")-N=O+H_(2)O)`
Discussion
8659.

Why are polysaccharides called non-sugars?

Answer»

SOLUTION :Polysaccharides are CALLED as non-sugars SINCE they don.t have an SWEET taste.
Discussion
8660.

Which of the following resonance structures is incorrect

Answer»




ANSWER :C
Discussion
8661.

Which of the following species has polar and non-polar bonds but molecule as a whole is non-plonar?

Answer»

`S_(2)O_(3)^(2-)`
`(SCN)_(2)`
`Be_(2)Cl_(4)`
`Si_(2)H_(6)`

Solution :
Discussion
8662.

Which of the following is more stable complex and why ? [Co(NH_(3))_(6)]^(3+) and [Co(en)_(3)]^(3+)

Answer»

SOLUTION :`[CO(EN)_(3)]^(3+)` is more STABLE due to chelate effect of the bidentate ligand, en, as it forms RINGS.
Discussion
8663.

Using IUPAC nomenclature, write systematic names of the following : (a) [Co(NH_(3))_(6)](SO_(4))_(3) (b) [Pt(NH_(3))_(2)Cl_(2)] (c )K_(3)[Cr(C_(2)O_(4))_(3)]

Answer»

SOLUTION :(a) tetraammine COBALT (VI) sulphate (b) diamminedichloridoplatinum (II)
(c ) POTASSIUM trioxalotochromate (III)
Discussion
8664.

Which of the following is not present in nucleotide :

Answer»

Guanine
Cytosine
Adenine
Thyroxine

Answer :D
Discussion
8665.

Which compound will give unimolecular nucleophilic substitution reaction easily with aqueous NaOH ?

Answer»

`C_(6)H_(5)-overset("Cl ")overset("| ")underset(C_(6)H_(5))underset("|")("C ")-CH_(3)`
`C_(6)H_(5)-CH_(2)-CH_(2)-Cl`
`C_(6)H_(5)-underset("Cl ")underset("| ")("C ")H-CH_(3)`
`C_(6)H_(5)-CH_(2)-Cl`

Solution :Rate of `S_(N)1` reaction depends on stability of carbocation. Greater stability of carbocation RESULTS in higher rate of `S_(N)1`. The ORDER of stability of carbocation is tertiary `gt` secondary `gt` primary.
(D) `C_(6)H_(5)CH_(2)-Cl "" 1^(@)`
(B) `C_(6)H_(5)CH_(2)-CH_(2)-Cl "" 1^(@)`
(C ) `C_(6)H_(5)-underset("Cl ")underset("| ")("C ")H-CH_(3) "" 2^(@)`
(A) `C_(6)H_(5)-overset("Cl ")overset("| ")underset(C_(6)H_(5))underset("|")("C ")-CH_(3) "" 3^(@)`
`overset(darr)overset(S_(N)1)underset(darr)underset("increases")("reactivity")`
Discussion
8666.

Which one of the following compounds do not give primary alcohol on reduction ?

Answer»

PROPANOIC acid
Propanal
Methyl propanoate
PROPAN- 2- ONE

Solution :Propan- 2- one
Discussion
8667.

Which of the following reacts with AsF_(3) in liquid BrF_(3)?

Answer»

`XeF_(6)` only
`XeF_(6)` and `XeF_(4)`
`XeF_(2)` and `XeF_(6)`
`XeF_(6)` and `XeF_(2)`

SOLUTION :`XeF_6` and `XeF_2` is a `F^(-)`donor. It reacts with `PF_5, AsF_5` and `SbF_5` in presence of covalent solvent such as `BrF_3`.
`XeF_(2) + 2AsF_(5) to [XEF]^(+) + [As_(2)F_(11)]^(-)`
`XeF_(6) + AsF_(5) to [XeF]^(+) + [AsF_(6)]^(-)`
Discussion
8668.

Which method is used in refining of Titanium method ?

Answer»

ZONE refining 
MOND CARBONYL 
Frasch method 
Van Arkel 

ANSWER :D
Discussion
8669.

Which compound, when dissolved in water, conducts electricity and forms a basic solution ?

Answer»

HCl
`CH_(3)COOH`
`CH_3OH`
NaOH

Solution :Strong electrolyte is an IONIC compound that dissociates completely in water & CONDUCTS electricity. From the given options, only NaOH and HCl are strong electrolyte and NaOH alone would form a basic solution when dissolved in water. NaOH is strong electrolyte. it is an alkali-a water soluble strong BASE.
Discussion
8670.

Whichamongthe followingamineswillgive carbylaminereaction?

Answer»

`CH_(3)-CH_(2)-NH_(2)`
`CH_(3)-NH -CH_3`
`(C_(6) H_(5 ) )_3N`
`CH_(3)-CH_2-NH-OH`

ANSWER :A
Discussion
8671.

Which of the following carbocation is maximum stable

Answer»




ANSWER :D
Discussion
8672.

Which of the following vitamin contains ionone ring and hydrocarbon chain ?

Answer»

RETINOL
CALCIFEROL
Thiamin
Riboflavin

Answer :A
Discussion
8673.

Which of the following possess net dipole moment?

Answer»

`SO_(2)`
`BF_(3)`
`BeCl_(2)`
`CO_(2)`

Answer :A
Discussion
8674.

When an alkyl halide is allowed to react with a sodium alkoxide the product most likely ?

Answer»

An ALDEHYDE
A ketone
An ether
A CARBOXYLIC acid

Answer :C
Discussion
8675.

Water soluble vitamins are

Answer»

A,D 
E,K 
DE
CB 

ANSWER :D
Discussion
8676.

Which of the following thermodynamic relation is correct

Answer»

dG=VdP-SdT
DE=PdV+TdS
dH=VdP+TdS
dG=VdP+SdT

Solution :`G=H-TS`
`because H = E + PV`
`therefore G = E + PV - TS`
Upon differentiation
`dG=dE+PdV+VdP-TdS-SdT"....(i)"`
dq=dE-dw
If the work done is only due to expansion, then,
-dw=PdV
for a reversible PROCESS,
`dS=(dq)/(T)or TdS = dq"....(II)"`
and ALSO dq `= dE + PdV ".....(iii)"`
Combining eqs. (i) , (ii) and (iii), we have
`dG=VdP-SdT`.
Discussion
8677.

Which product will be obtained by Gridnard reaction, when Formaldehyde reacts with Ethyl magnesium lodide?

Answer»

2 - Propanol
1 - Propanol
Ethanol
2 - METYL, 2 - Propanol

Answer :B
Discussion
8678.

What are the common types of secondary structure of proteins ?

Answer»

SOLUTION :The CONFORMATION which the POLYPEPTIDE chains assume as a RESULT of hydrogen bonding is called the secondary STRUCTURE of the proteins. The two types of secondary structures are : `alpha` -helix and `beta`-pleated sheet structure .
Discussion
8679.

Three reactions involving H_(2)PO_(4)^(-) are given below (i) H_(3)PO_(4) + H_(2)O rarr H_(3)O^(+) + H_(2)PO_(4)^(-) (ii) H_(2)PO_(4)^(-) + H_(2)O rarr HPO_(4)^(2-) + H_(3)O^(+) (iii) H_(2)PO_(4)^(-) + OH^(-) rarr H_(3)PO_(4) + O^(2-) In which of the above does H_(2)PO_(4)^(-) act as an acid

Answer»

(i) only
(II) only
(i) and (ii)
(III) only

Answer :B
Discussion
8680.

Which is used as a preservative for biological specimens:

Answer»

Formalin
Formic acid
Liquid `NH_3`
ACETIC acid

Answer :A
Discussion
8681.

The structure of cumene is ___________

Answer»




NONE

ANSWER :C
Discussion
8682.

Which of following is polymeric phosphorous ?

Answer»

WHITE P
Red P
Black P
Yellow P

Answer :B
Discussion
8683.

Which antacids produce alkaline medium in stomach ?

Answer»

METAL hydroxide
Sodium hydrogen carbonate
Sodium hydrogen sulphite
Metal OXIDE 

Solution :Sodium hydrogen carbonate
Discussion
8684.

Use the given data to calculate the resonance energy of N_(2)O.(Delta_(f)H^(ө) of N_(2)O=82kJmol^(-1)) Bond energy of N=Oto607kJmol^(-1) Bond energy of O=Oto498kJmol^(-1) bond energy of N=Nto418kJmol^(-1) Bond energy of N-=Nto946kJmol^(-1) Choose the correct option.

Answer»

82 KJ `mol^(-1)`
`-88kJ` `mol^(-1)`
`-82` kJ `mol^(-1)`
`+88kJmol^(-1)`

SOLUTION :`N-=N(g)+(1)/(2)O_(2)(g) to N=N=O`
Calculated VALUE of
`Delta_(f)H^(ө)H^(a(s)toNa(g),Delta_(g)H^(ө)=[BE(N-=N)+(1)/(2)BE(O=O)]`
`-[BE(N=N)+BE(N-=overset(+)(O))]`
`=[946+(1)/(2)(498)]-[418+607]`
`=170" kJ "mol^(-1)`
Resonance energy=Observed `Delta_(f)H^(@)-`Calculated `Delta_(f)H^(@)`
`=82-170=88" kJ "mol^(-1)`.
Discussion
8685.

Which the statements about glass are correct ? 1. Glass is a super-cooled liquid having infinite viscosity. 2. violet coloured glass is obtained by adding MnO_(2). 3. Glass is a man-made silicate 4. glass is a crystallilne substance. Select the correct answer using the codes given below

Answer»

1,2 and 4
2,3 and 4
1,2 and 3
1 and 3

Solution :AMONG all the GIVEN OPTIONS only glass is an amorphous SOLID.
Discussion
8686.

Write the IUPAC names of the following compounds: .

Answer»

Solution :(i). 3-Chloro-5-fluoro-3,5-dimethylheptane
(ii). 3-Bromo-5-chloro-3,5-dimethylheptane
(III). 1-Chloro-3,3--dimethylbutane.
(iv). 5-Chloro-3-ethylpentane-2-one
(v). 2-(2-bromophenyl) ETHANAL.
(vi). 2,3-dibromo-1-chloro-2-methylpentane.
(vii). 3-bromo-2-chloro-5-methyloctane
(viii). 3-bromohexa-1,3,5-triene
(ix). 2,3-dibromo-1,4-dichlorobut-2-ene.
(x). 5-chloro-1-iodopent-2-yne
(xi). 2-chloro-2-trichloromethylhexachloropropane.
(xii). 3-bromo-2-methylprop-1-ene.
(xiii). 4-Bromo-4-methylpent-2-ene.
(XIV). 5-Chloro-4-methylhex-1-ene.
(xv). 2,4,6tribromobenzenamine.
(xvi). 1-Bromobut-2-ene.
Discussion
8687.

Which of the following represents correctly the variation of degree of adsorption against temperature for physical adsorption ?

Answer»




ANSWER :B
Discussion
8688.

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

Answer»

Emulsification
Colloid formation
COAGULATION
Peptization

SOLUTION :Coagulation
Discussion
8689.

Which of the following is strongest reducing agent?

Answer»

`HCL`
`HI`
`HBR`
`HF`.

ANSWER :B
Discussion
8690.

Which among the following is a false statement

Answer»

HALF life of a third ORDER reaction is inversely proportional to the square of INITIAL concentration of the reactant
Molecularity of a reaction may be zero or FRACTIONAL
For a first order reaction `t_(1//2)= (0.693)/(K)`
Rate of zero order reaction is INDEPENDENT of initial concentration of reactant

Solution :Molecularity of a reaction never become zero or fraction .
Discussion
8691.

What type of organic compounds are prepared by Gatterman-Koch reaction ?

Answer»

ALIPHATIC aldehyde
Aromatic ketone
Aliphatic ketone
Aromatic aldehyde

Answer :D
Discussion
8692.

Which is an amphoteric oxide ?

Answer»

ZnO
CaO
BaO
SrO

Answer :A
Discussion
8693.

Which one of the following is not a fatty acids:

Answer»

STEARIC ACID
PALMITIC acid
OLEIC acid
Phenylacetic acid

Answer :D
Discussion
8694.

The total number of possible isomers of the compound [Cu^II(NH_3)_4] [Pt^IICl_4] are:

Answer»

3
5
4
6

Answer :C
Discussion
8695.

Which of the following mixtures, of ions in solution can be separated by using NaOH solution?

Answer»

`FE^(+3)` and `Pb^(+2)`
`Pb^(+2)` and `SN^(+2)`
`Zn^(+2)` and `Sn^(+2)`
`Al^(+3)` and `Cu^(+2)`

SOLUTION :`Pb^(2+), Al^(3+)` SOLUBLE in excess NAOH but not `Fe^(3+)` and `Cu^(2+)`
Discussion
8696.

Which of the following plot gives Ellingham diagram?

Answer»

`DeltaS` VS T
`Delta^(@) Vs T`
`DELTAG^(@) Vs (1)/(T)`
`DeltaG^(@) Vs T^(2)`

Answer :B
Discussion
8697.

What happens when ethanol is treated with phosphorus pentachloride?

Answer»

Solution :Ethyl chloride is OBTAINED
`C_(2)H_(5)OH+PCl_(5)RARR C_(2)H_(5)Cl+HCl+POCl_(3)`.
Discussion
8698.

What is the changein internalenergywhen a gas constantsfrom377 ml to 177 mlundera constantpressureof 1520 torr , while at thesame time being cooledby removing124Jheat ?[Take :(1 L atm )n= 100 J]

Answer»

`-24 J`
` -84J`
`-164 J`
`-248 J`

Solution :`C_(4)H_(4)+HCl to C_(2) H_(5)Cl`
`Deltan_(g) = - 1`
HClislimitingreagent `rArr DeltaU= DeltaH - Deltan_(g)RT`
` = - 185 +(1 xx 8.314 xx 10 ^(-3) xx 300) = - 69.8 kJ`
Fortwo MOLE of HCl `= - 69.8 xx2= -139.6 kJ`
Discussion
8699.

Which of the following have a trigonal planar (or triangular) structurc?

Answer»

`: BAR(C)H_(3)`
`overset(+)(CH_(3))`
`BF_(3)`
`: overset(+)(O)H_(3)`

SOLUTION :
Discussion
8700.

Which of the following modes of expressing concentration is independent of temperture?

Answer»

Mass percentage
VOLUME percentage
STRENGTH
Molarity

Solution :Mass percentage (w/w) and volume percentage (`upsilon//upsilon)` are INDEPENDENT of temperature. Strength and molarity DEPENT upon temperature.
Discussion