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10751.

Which arrangement of electrons describes ferrimagnetism?

Answer»




NONE of these

ANSWER :C
Discussion
10752.

Which of the following is the green coloured powder produced when ammonium dichromate is used in fire works

Answer»

`Cr`
`CrO_(3)`
`Cr_(2)O_(3)`
`CrO(O_(2))`

Solution :`(NH_(4))_(2)Cr_(2)O_(7)overset(Delta)rarrN_(2)+Cr_(2)O_(3)+4H_(2)O`
Discussion
10753.

Primary alcohol to aldehyde

Answer»

Solution :`CH_(3)-CH_(2)-OH underset("(or)Cu-573 K")OVERSET("Pyridinium chlorochromate (PCC)")to CH_(3)CHO`
Discussion
10754.

Which wave property is directly proportional to energy of electromagnetic radiation ?

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Velocity
Frequency
Wave number
All of these

Answer :D
Discussion
10755.

What is the IUPAC name of CH_(2)= CH-O-CH=CH_(2)

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Ethenoxy ETHENE
Divinyl ether
2 - ETHOXY propane
Diethyl ether

Solution :Ethenoxy ethene
Discussion
10756.

What are amines ? How are they classified ?

Answer»

Solution :(i) Amines are compounds DERIVED from AMMONIA by replacing one or more hydrogen atoms by alkyl or aryl group.
(ii) They are classified as primary, secondary and TERTIARY amines.
(a) When one of the hydrogen atoms in `NH_3` is replaced by alkyl, it is primary AMINE `CH_3NH_2` METHYL amine `(1^(@))`.
(b) If two hydrogen atoms of amine group are replaced by alkyl groups, it is a secondary amine `(CH_3)_2` NH-dimethylamine `(2^(@))`.
(c ) If three hydrogen atoms of amine group are replaced by alkyl groups, it is a tertiary amine. `(CH_3)_3` N-trimethylamine `(3^(@))`.
Aromatic amine- `C_6H_5NH_2` Aniline.
Discussion
10757.

Urea can be tested by

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BENEDICT test
Mulliken test
Ninhydrin
Biuret test

Answer :D
Discussion
10758.

What is C in the following reaction ? C_(2)H_(5)Br overset(NaOH)to A overset(Na)to B overset(CH_(3)I)to C

Answer»

ETHYL iodide<BR>Ethane
Propane
Methyl ethyl ether

Solution :`C_(2)H_(5)Br overset(NAOH)to C_(2)H_(5)OH overset(Na)to C_(2)H_(5)ONa overset(CH_(3)I)to CH_(3)-O-C_(2)H_(5)`
Discussion
10759.

What is adsorption ? How is it classified ? Give the main applications of adsorption.

Answer»
Discussion
10760.

Which of the followingare biodegradable

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PHBV
polyglycollic acid
Polylactic acid
Nylon-66

Solution :PHBV (polyhydroxybutyrate -CO-`beta-`hydroxyvalerate) polyglycollic acid, polylactice acid are DECOMPOSED easily, therefore , are BIODEGRADABLE whereas Nylon-66 is not (d) is not CORRECT.
Discussion
10761.

Which of the following compounds will produce a compound with offensive when treated with CHCl_(3)//KOH?

Answer»




SOLUTION :N//A
Discussion
10762.

What is condensation polymerization ? Explain with example.

Answer»

Solution :This type of polymerization generally involves a repetitive condensation REACTION between two different bi-functional or trifunctional mono-meric UNITS. These polycondensation reactions may result in the loss of some simple molecules as water, alcohol, hydrogen chloride, etc. and LEAD to the formation of high molecular MASS condensation polymers.
In these reactions, the product of each step is again a bi-functional species and the sequence of condensation goes on. Since, each step produces a distinct functionalized species and is independent of each other, this process is also called as step growth polymerization.
The formation of terylene or dacron by the interaction of ETHYLENE glycol and terephthalic acid is an example of this type of polymerization.
Discussion
10763.

Which pair of electrolytes could not be distinguished by the products of electrolysis, using inert electrodes

Answer»


Solution :ELECTROLYSIS of both KCl and NACL liberates `H_(2)` at the cathode and `Cl_(2)` at the anode. But the RESULTING solutions will be DIFFERENT.
Discussion
10764.

What will be the correct order for the wave length of light observed for the following ? (P) [Ni(NO_(2))_(6)]^(4-)""(Q)[Ni(NH_(3))_(6)]^(2+) (R) [Ni(H_(2)O)_(6)]^(2+)

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`PgtQgtR`
`QgtPgtR`
`RgtQgtP`
`QgtRgtP`

Solution :`Delta_(0) implies NO_(2)^(-) gt NH_(3) gt H_(2)O`
`lambda_(abs) implies NO_(2)^(-) ltNH_(3) LT H_(2)O`
`lambda_(abs) implies P gt Q gt R`
Discussion
10765.

Which form of energy is converted to electrical energy in batteries?

Answer»

tidal energy
CHEMICAL energy
mechanical energy
atomic energy

ANSWER :B
Discussion
10766.

Which of the following radiations can be easily stopped by air?

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`ALPHA`-RAYS
`BETA`-rays
`GAMMA`-rays
all the above.

Answer :A
Discussion
10767.

Which of the following repesents the poisonous gas which caused tragedy in Bhopal in 1984 ?

Answer»

`CH_(3)C=N=S`
`CH_(3)-N=C=S`
`CH_(3)-N=C=O`
`CH_(3)-O-N EQUIV C`.

Solution :`underset("METHYL ISOCYANATE (MIC)")(H_(3)C-N=C=O)`
Discussion
10768.

What is the structural difference between a nucleoside and a nucleotide ?

Answer»

SOLUTION :
Discussion
10769.

Write the formulas for the following coordination compounds : Tris(ethane-1, 2-diamine)chromium(III) chloride

Answer»

SOLUTION :`[CR(EN)_(3)]Cl_(3)`
Discussion
10770.

Which of the following ore is best concentrated by froth floating process?Magnetite,galena,Malachite,Cassiterite

Answer»

Magnetite
galena
Malachite
Cassiterite

Answer :B
Discussion
10771.

Which one of the following pair of compounds illustrate the law of multiple proportion

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`CUO and Cu_2O`
`SnCl_2` and `PbCl_2`
`CaC_2` and `CaSO_4`
`H_2O` and `D_2O`

ANSWER :A
Discussion
10772.

The solubility product (K_(sp)) of sparingly soluble salt AgIO_(3) is 1xx10^(-8) at a given temperature. What is the mass of AgIO_(3) (molar mass =283) contained in 100ml solution at this temperature :-

Answer»

`1XX10^(-4)G`
`28.3xx10^(-2)g`
`2.83xx10^(-3)g`
`1xx10^(-7)g`

SOLUTION :`N//A`
Discussion
10773.

Which of the following statement (s) is /are correct on the basis of heat of combustion ?

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Trans-2-hexene is more STABLE more than cis-2-hexene .
Cis-2-pentene has HIGHER heat of COMBUSTION than trans-2-pentene.
1-hexene has higher STABILITY than propene.
2,3-dimethyl but-

Answer :A::C::D
Discussion
10774.

When FeCl_(3) is added to phenol

Answer»

No REACTION occurs
A coloured complex will be formed
`Fe^(3+)` will be oxidized to HIGHER state
o-Chlorophenol will be formed

Answer :B
Discussion
10775.

Which is incorrect statement

Answer»

AgF is water insoluble
`F^(o.)` ION does not gives ppt, with `AgNO_(3)`
`Cl_(2), Br_(2) I_(2)` TURNS starch SOLUTION to blue
Bromine vapour turns MOIST starch-iodine paper to blue.

Solution :(a) AgF is water soluble, (c ) `Cl_(2), Br_(2) I_(2)` does not turns starch solution to blue.
Discussion
10776.

Which of the following is formed when calcium combines with oxygen

Answer»

CA
CAO
`CaO_(2)`
`Ca_(2)O_(2)`

SOLUTION :`Ca+1/2 O_(2) to CaO`
Discussion
10777.

Which of the following proteins acts as a messenger in living system

Answer»

Hormone
Enzyme
Protective protein
Transport protein

Answer :A
Discussion
10778.

Water pollution is caused due to

Answer»

SEWAGE and other wastes
Industrial effluents
Agricultural discharges
All of these

Answer :D
Discussion
10779.

which of the following are highly crossed linked polymers

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Alkyd RESIN
Melamac
LDPE
PAN

Solution :Alkyd resin and MELMAC are crossed LIKED POLYMERS.
Discussion
10780.

Which one is least basic ?

Answer»

`Tb(OH)_(3)`
`YB(OH)_(3)`
`GD(OH)_(3)`
`Eu(OH)_(3)`

ANSWER :B
Discussion
10781.

Which of the following is a mild tranquilizer?

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Valium
Meprobamate
Bithional
Norethindrone

ANSWER :B
Discussion
10782.

When an aqueous solution containing sodium acetate and sodium propionate is electrolyzed we get

Answer»

PROPANE
ETHANE
BUTANE
All of these

Answer :D
Discussion
10783.

Whichof the followingis morebasicin aqueousmediumis

Answer»




SOLUTION :Whenelectronwithdarwinggroupgoesaway FORM `- NH_(2)`GROUP, the baiscityof amineincrease .
Discussion
10784.

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

Answer»

EMULSIFICATION
Colloid FORMATION
COAGULATION
Peptisation

Answer :C
Discussion
10785.

When borax bead containing a small amount of metal salt ws heated in reducing flame of bunsane burner, the colour of the bead after heating was blue . The metal presencein the salt would be

Answer»

Manganese
Nickel
Cobalt
Chromium

Answer :C
Discussion
10786.

Whichis mostversatilecompound inthesynthesisofaromaticcompound?

Answer»

Benzendiazoniumchloride
Nitrobenzene
`C_(6)H_(5)CONH_(2)`
`C_(6) H_(5) CI`

Solution :Propertyof `C_(6) H_(5) overset( o+)(N_(2)) overset( THETA) (CI )`
Discussion
10787.

Which kind of isomerism is exhibited by [Co(EDTA)]^(-):

Answer»

OPTICAL and GEOMETRICAL isomerism
Geometrical isomerism
Optical isomerism
No isomerism

Answer :C
Discussion
10788.

Two liquids A and B are partially miscible (Molecular mass A=20, Molecular mass B=40). On mixing 1 mol of A with 3 moles of B, two different layers M and N are formed with layer M containing 0.2 mole fraction of A and layer N containing 0.6 mole fraction of A. The ratio of masses of layer M to layer N will be :

Answer»

`1:3`
`3:1`
`1:9`
`9:1`

ANSWER :D
Discussion
10789.

When salicylic acid is treated with acetic anhydride, we get :

Answer»

ASPIRIN
paracetamol
salol
none of the above

Solution :aspirin
Discussion
10790.

Which of the following statement(s) is/are true about Williamsons synthesis ?

Answer»

It is desirable to use primary R-X
This method is particularly USED for preparation of MIXED ether
It is BEST to use the alkoxide of `2^@` and `3^@` alcohols
All of these

Answer :D
Discussion
10791.

Which of the following metal can be obtained by the thermal decomposition of its oxide?

Answer»

Fe
Al
Hg
Cr

Answer :C
Discussion
10792.

The relative stablility of the compounds: (GRB_ORG_CHM_P1_C07_E01_260_Q01.png" width="80%">

Answer»

`I gt II gt III gt IV gt V gt VI`
`VI gt V gt IV gt III gt II gt I`
`I gt III gt V gt II gt IV gt VI`
`II gt I gt IV gt III gt V gt VI`

SOLUTION :N//A
Discussion
10793.

Which of the following oxidation states is common for all lanthanides ?

Answer»

`+2`
`+3`
`+4`
`+5`

Answer :B
Discussion
10794.

Which of the following can be used to test the acidic nature of ethanol?

Answer»

`Na_(2)CO_(3)`
Blue litmus solution
NA METAL
`NaHCO_(3)`

Solution :ALCOHOL isacidic in nature
`2R-O-Hoverset(2Na)to 2RONA=H_(2)`
Discussion
10795.

Which of the following compounds are form micelle-

Answer»

pyridinium CHLORIDE
sodium oleate
SUCROSE
cetytrimethylammonium

ANSWER :B::D
Discussion
10796.

Which enzyme converts glucose and fructose both into ethanol

Answer»

Diastase
Invertase
ZYMASE
Maltase

Solution :`underset("Glucose or Fructose")(C_(6)H_(12)O_(6))overset("Zymase")to underset("Ethyl alcohol")(2C_(2)H_(5)OH+2CO_(2))`
Discussion
10797.

Which of the following is an example of aldol condensation ?

Answer»

`2CH_(3) OVERSET(OH^(-)) to CH_(3)CH(OH) CH_(2)CHO`
`C_(6)H_(5) CHO overset(OH^(-)) to C_(6)H_(5)CH_(2)OH`
`HCHO overset(OH^(-)) to HCH_(2) OH`
`C_(6)H_(5)CHO+HCHO overset(OH^(-))to C_(6)H_(5)CH_(2)OH`

Answer :A
Discussion
10798.

Which of the following alkyl Halides when subjected to dehydro halogenation by the action of ethanoic KOH would yield action of ethanoic KOH would yield CH_(3)-CH=underset(CH_(3))underset("|")("C ")H-CH_(3) ?

Answer»

`CH_(3)-CH(BR)-CH(CH_(3))_(2)`
`CH_(3)-CH_(2)-CH(Br)-CH_(2)CH_(3)`
`CH_(3)-CH_(2)-CH(CH_(3))-CH_(2)Br`
`CH_(3)-CH(Br)-(CH_(2))_(2)-CH_(3)`

ANSWER :A
Discussion
10799.

Which one of the following process involves in the principle of fractional crystallisation for the refining of impure metals?

Answer»

PARKER's process
Mond's process
van-Arkel's process
zone refining

Answer :D
Discussion
10800.

Which is not the property of nitrogen

Answer»

NITROGEN bonding
Catenation
Allotropy
Low b.pt.

Answer :C
Discussion