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8451.

What is biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.

Answer»

Solution :Biodegradable polymers : Biodegradable polymers are POLYMER which contain functional groups similar to the functional groups present in BIOPOLYMERS but are degradable and does not POSE hazard to atmosphere.E.g., (PHBV).
POLY `beta` - hydroxy butyrate : Which is obtained by the copolymerization of 3-hydroxy butanoic acid and 3-hydroxypentanoic acid.
Discussion
8452.

Which ofthefollowingaromaticcompoundgivessulphonationreactionveryeasily ?

Answer»

CHLOROBENZENE
NITROBENZENE
TOLUENE
BENZENE

SOLUTION :ToluenegivessulphonationreactionveryquicklyduetoH -bondformation.
Discussion
8453.

What is the mass of hydrogen peroxide in 1 L of 2 M solution ?

Answer»

10.2 G
102 g
11.3 g
68 g

Answer :D
Discussion
8454.

Which of these esters can answer the iodoform test ?

Answer»

ETHYL ACETATE
Methyl acetate
BENZYL methanoate
phenyl benzoate

ANSWER :1
Discussion
8455.

Which statement is correct with reference to Arrhenius equation K=Ae^(-Ea//RT)?

Answer»

A is adsorbent coefficient
`E_(a)` is a ACTIVATION energy
R is Rydberg constant
K is EQUILIBRIUM constant

Answer :B
Discussion
8456.

Which hormones increase lactic acid in muscles?

Answer»

progestron
estrogen
nor-adreneline
adrogen

Answer :C
Discussion
8457.

Which of the following is not an isomer of 1-Butyne?

Answer»

But-2-yne
Buta-1, 3- diene
But-2-ene
Methylcyclo propene

Answer :C
Discussion
8458.

Whatis thegeneral chemical name of carbohydrates ?

Answer»

Poly hydroxyaldehyde or ketones
Poly HYDROXY ESTERS
Poly AMINO ACIDS
Poly CARBOXYLIC estes.

Answer :A
Discussion
8459.

What is X in the following reaction? 2CH_(3)CHOoverset(NaOH)toX

Answer»



`CH_(3)CH(CH_(3))CH_(2)COCH_(3)`

Solution :Ketones containing a HYDROGENS undergo aldol condensation in the presence of `Ba(OH)_(2)` to form beta hydroxy ketones.
`2CH_(3)COCH_(3)overset(Ba(OH)_(2))to`
Discussion
8460.

When ammonium acetate is heated_____is formed.

Answer»

SOLUTION :ACETAMIDE or ETHANAMIDE.
Discussion
8461.

Which polymer is used in preparation of crokery ?

Answer»

MELAMINE
BAKELITE
Neoprene
Decron

SOLUTION :Melamine
Discussion
8462.

Which of the following can decolourise bromine water solutions ?

Answer»




ANSWER :A::B::C::D
Discussion
8463.

Write the names and structures of the following compounds: a. TNB, b. TNT c. PABA, d. DDT e. DES, f.Cumene g. Mesitypenone, h. Acteophenone i. Benoxopheone, j. Stryl chloride k. Cinnamic acid, l. Cinnamylacohol m. alpha- Phenylethanol, n. beta- Phenlehanol o. Benzhydryichloride

Answer»

<P>

Solution :a. Trinitrobenzene (used as an explosive)
or `1,3,5-` Trinitrobenzene or Symmetrical `(sym)` trinitorbenze.
b. Triitortolune (used as an explosive)
(`2,4,6-` Trinitroluene)
c. Para- Aminobenzoic acid or `p`- aminobenzoic acid or 4-` aminobenzonic acid. It is a a metabolite for ENZYME.

d. `4,4'-` Dichloridiphenyl trichloroetane

e. Diethylstibestrol

`(E)-3,4,4-`(`4,4'-` Dihdroxy phenyll) -hex-3 ene
f. Isopropyl benzene or `2-` Phenyl propane

g. sym-Trimethyl benzene or `1,3,5-` Trimethyl benzene
(##KSV_CHM_ORG_P2_C11_S01_005_S07.png" width="80%">
h. (Acetophenone OT Methyl phenyl ketone or 1-Phenyl ethanone)
i. (Benzophenoen or Diphenyl ketone)
j. `C_(6) H_(5) C overset(1)(C)OOH` (Cinamic acid or `1`-Cholor `-2-`phenyl ethene)
k. `C_(6)H_(5) overset(3)(C)H = overset(2)(H) - overset(1)(C) OOH` (Cinnamic acid or `3-` Phenyl prop `2-` enol)
m. (`alpha` Phenyl ethanol or `1`-Phenyl entyhanol)
n. `Ph - overset(2beta)(C)H_(2) - C_(1)^(alpha) H_(2) - OH` (`beta` -Phenyl ethanol or `2-` Phenyl ethanol)
o. `Ph - underset(Cl) underset(|)(CH) - Ph`(Benzhydrl chloride or 1 - Chioro `1,1` - diphenyl methane)
Discussion
8464.

when KMnO_4actsas an oxidizingagentandultimatclyformsMnO_(4)^(2-),MnO_2 ,Mn_2O_3andMn^(2+) then thenumberof electrons transferredin eachcaserespectivelty is

Answer»

4,3,1,5
1,5,3,7
1,3,4,5
3,5,7,1

Solution :`KMnO_4overset( +1e^(-)) tooverset( +6)((MnO_4)^(2-))`
` OVERSET(+7 )(KMn O_4 ) overset( +3e^(-)) tooverset(+4)(MnO_2)`
`overset(+7)(KMnO_4) overset( +4E^(-)) to(1)/(2) overset(+3)(Mn_2 O_3)`
` ( 2x -6 =0or x=3)`
` overset(+7 ) ( KMnO_4) overset(+e^(-))toMn^(2+)`
Discussion
8465.

What is the action of hydrogen cyanide onAcetaldehyde ?

Answer»

Solution :ACTION of HCN on ACETALDEHYDE : When acetaldehyde is treated with hydrogen cyanide, acetaldehyde cyanohydrin is FORMED.
`UNDERSET("acetaldehyde")(CH_(3) -overset(H) overset(|)C=O)+HCN overset(OH^(-)) tounderset("acetaldehyde cyanohydrin")(CH_(3)-underset(CN)underset(|) overset(H)overset(|)C-OH)`
Discussion
8466.

Which disease caused by Vitamin H deficiency ?

Answer»

Xerophthalima
Animia
SKIN DISEASE
SCURVY

SOLUTION :Skin disease
Discussion
8467.

Which elementamong the followingdoes not form diatomic molecules ?

Answer»

Argon
Oxygen
Nitrogen
Bromine

Solution :Noble GAS (He, Ne, AR, Kr, XE and Rn) does not formdiatomicmolecules.Due to presenceof completelyfilled VALENCESHELL,these gases are highlystable.
Discussion
8468.

Which one of the properties is not shown by H_(2)SO_(4) ?

Answer»

An acid
An OXIDIZING AGENT
As a DEHYDRATING agent
As a REDUCING agent

ANSWER :D
Discussion
8469.

What happens when a lyophilic sol is added to a lyophobic sol ?

Answer»

Lyophobic sol is PROTECTED
LYOPHILIC sol is protected
Film of lyophilic sol is formed over lyophobic sol
Film of lyophobic sol is formed over lyophilic sol

ANSWER :A::C
Discussion
8470.

When the electron of a hydrogen atom jumps from n = 4 to n = 1 state, the maximum number of spectral lines emitted is

Answer»

15
9
6
3

Answer :C
Discussion
8471.

Which one of the following can be used as a monomerin a polymerization reaction?

Answer»

`CH_3CH_2Cl`
`CH_3CH_2OH`
`C_6H_6`
`C_3H_6`

SOLUTION :Only OLEFINES (here `C_3H_6`) and dienes UNDERGO ADDITION polymerization.
Discussion
8472.

The temperature coefficient of two reactions are 2 and 3 respectively. Which would be correct for these reactions ?

Answer»

`E_(a_(1)) LT E_(a_(2))`
`E_(a_(1))gt E_(a_(2))`
`E_(a_(1))= E_(a_(2))`
Nothing can be said.

Solution :`(K_(1))/(K_(2))=(E_(a_(1)))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]=2`
`(K_(1))/(K_(2))=(E_(a_(2)))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]=3`
if, `(K_(1))/(K_(2)) lt (K_(1).)/(K_(2).)` then `E_(a_(2)) gt E_(a_(1))`
Discussion
8473.

Which of the following would lose weight on exposure to air ?

Answer»

Conc. `H_(2)SO_(4)`
Conc. `HNO_(3)`
Anhydrous `Na_(2)CO_(3)`
A SATURATED SOLUTION of `CO_(2)`

Solution :`CO_(2)` will be LOST.
Discussion
8474.

The values of wedge_(eq)^(infty)" for " Nh_(4)Cl,NaOH and Nacl are repectively 149.74, 248.1 and 126.4" ohm"^(-1)cm^(2)eq^(-1). The value of wedge_(eq)^(infty)" in NH_(4)OH is:

Answer»

`371.44"ohm^(-1)cm^(2)eq^(-1)`
`271.44"ohm^(-1)cm^(2)eq^(-1)`
`71.44"ohm^(-1)cm^(2)eq^(-1)`
It cannot be CALCULATED FORM the DAT provided

ANSWER :B
Discussion
8475.

Which of the following plots represents the behaviour of an ideal binary liquid solution ?

Answer»

Plot of `P_(A)` versure `X_(A)` (MOLE fraction of A in liquidphase) is linear
Plot of `P_(B)` versus `X_(B)` is linear
Plot of `P_("total")` versus `X_(A)` (or) `X_(B)` is linear
Plot of `P_("total")` versus `X_(A)` is nonlinear

ANSWER :A::B::C
Discussion
8476.

Write the mechanism of acid catalysed dehydration of ethanol to give ethene.

Answer»

SOLUTION :Mechanism of ACID catalysed DEHYDRATION of ethanol :
STEP : 1 Protonation of ethanol.

Step 2 : Elimination of water molecule.
Discussion
8477.

Which one of the following will be able to show cis­trans isomerism:

Answer»

`MA_3B`
`M(AA)_2`
`MA_2BCD`
`MA_4`

ANSWER :C
Discussion
8478.

Which of the following statements is incorrect about the collision theory of chemical reaction?

Answer»

It consider reacting molecules or atoms to be hard SPHERES and ignores their structural features.
Number of effective COLLISIONS determined the rate of reaction.
Collision of atoms or molecules possessing sufficient threshold ENERGY RESULTS into the product formation
Molecules should COLLIDE with sufficient threshold energy and proper orientation for the collision to be effective.

Solution :c is incorrect,because formation of product depends not only on energy but also on proper orientation at the time of collision.
Discussion
8479.

Which of the following exist

Answer»

`ICl_(3)`
`FCl_(3)`
`IF_(7)`
`BrF_(3)`

Solution :F only can echibit -1 OXIDATION STATE in COMBINED state
Discussion
8480.

The useful by products obtained in the Solvay process of manufacture of Na_(2)CO_(3) are :

Answer»

quick lime, `CO_(2)`
`NaHCO_(3),NH_(4)Cl`
`NH_(4)Cl` solution, quick lime
`NaHCO_(3),CO_(2)`

Answer :C
Discussion
8481.

Write the order of thermal stability of the hydrides of group 16 elements .

Answer»

SOLUTION :The THERMAL stability of the hydrides of group 16 elements decreases from `H_2O` to `H_2Te` as :
`H_2O GT H_2S gt H_2Se gt H_2Te `
Discussion
8482.

Vinylic halides are compounds in which the halogen atom is bonded to sp hybridised carbon atom of

Answer»

an ALKANE.
an ALKENE.
an ALKYNE.
an aromatic RING.

Answer :b
Discussion
8483.

Turnbull's blue and Prassian's bluerespectivelyare I.Fe^(II)[Fe^(II)(CN)_(6)]^(2-) ,II.Fe^(III)[Fe^(III)(CN)_(6)] ,III.Fe^(II)[Fe^(III)(CN)_(6)]^(Theta) ,II.Fe^(III)[Fe^(II)(CN)_(6)]^(Theta) ,II

Answer»

I,III
I,III
III,IV
IV,III

Answer :C
Discussion
8484.

Which of the following complexes can form d and l isomers ?

Answer»

`[Co(NH_(3))_(4)Cl_(3)]^(+)`
`[Co(NH_(3))_(2)Cl_(3)]`
trans-`[Co(en)_(2)Cl_(2)]`
cis-`[Co(en)_(2)Cl_(2)]^(+)`

Solution :cis FORM of `[Co(en)_(2)Cl_(2)]^(+)` SHOWS optical isomerism while trans form will not.
Discussion
8485.

Write the reaction of Cl_2with water.

Answer»

SOLUTION :`2Cl_2 + 2H_2O OVERSET(HV)(to) 4HCL + O_2`
Discussion
8486.

Writetheprincipleofthemethodusedforrefiningofgermanium.

Answer»

SOLUTION :Germaniumisrefinedbythemethodcalled 'zone refining'.Itisbasedontheprinciple thatthe impuritiesaremoresolubleinthemoltenstate(MELT ) thanin thesolidstateofthemetal.
Inother WORDS,whenthemeltofan impuremetalis allowedtocool,thepuremetalcrystallises outwhiletheimpuritiesremaininthe melt.
Discussion
8487.

Which of the following belong to secondary air pollutant ?

Answer»

CO
Hydrocarbon
PEROXYACETYL NITRATE (PAN)
NO

Answer :C
Discussion
8488.

The structure of pyrosulphuric acid is :

Answer»

`HO-OVERSET(O)overset(||)Sunderset(O)UNDERSET(||)S-overset(O)overset(||)S-OH`
`HO-overset(O)overset(||)underset(O)underset(||)S-O-overset(O)overset(||)underset(O)underset(||)S-OH`
`HO-O-overset(O)overset(||)underset(O)underset(||)S-OH`
`HO-overset(O)overset(||)underset(O)underset(||)S-O-O-overset(O)overset(||)underset(O)underset(||)S-OH`

ANSWER :B
Discussion
8489.

Which of the followingspecies is/are paramagnetic Fe^(2+),Zn^(0),Hg^(2+),Ti^(4+)

Answer»

`FE^(2+)` only
`ZN^(0)` and `Ti^(4+)`
`Fe^(2+)` and `Hg^(2+)`
`Zn^(0)` and `Hg^(2+)`

Solution :The outermost electronic configuration of Fe is
`Fe3d^(6)4s^(2)`
`Fe^(2+)3d^(6)4s^(0)`

Since `Fe^(2+)` has 4 unpaired electron it is paramagnetic in NATURE.
Discussion
8490.

Which of the following compound having mixture obtained on fermentation ?

Answer»

1-propanol
Ethanol
GLUCOSE
Glycerol

Solution :Glucose having 5-OH group COMPOUND with more -OH group are more soluble. `overset(CHO)overset(|)overset((CHOH)_(4))overset(|)CH(2)OH`
Discussion
8491.

Which one of the following is an acetal ?

Answer»




ANSWER :A
Discussion
8492.

What is the chief constituent of Pyrex glass?

Answer»

`B_(2)O_(3)`
`SiO_(2)`
`Al_(2)O_(3)`
`Na_(2)O`

SOLUTION :The CHIEF constituent of PYREX glass is `SiO_(2)`
Discussion
8493.

What is the electrolyte used in a dry cell ?

Answer»

SOLUTION :A PASTE of `NH_(4) CL`.
Discussion
8494.

What is the hybridization of Cr-in [Cr(NH_(3))_(6)]^(3+) ?

Answer»

`SP^(3)d^(2)`
`d^(2)sp^(3)`
`dsp^(2)`
`sp^(3)`

ANSWER :B
Discussion
8495.

Which of the following is strongest acid?

Answer»

HYPOCHLOROUS acid
Chlorous acid
Chloric acid
Perchloric acid.

Answer :D
Discussion
8496.

Which one of the following set of quantum numbers is not possible for 4p electron?

Answer»

`n=4,l=1,m=-1,m_(s)=+1/2`
`n=4,l=1,m=0,m_(s)=+1/2`
`n=4,l=1,m=2,m_(s)=+1/2`
`n=4,l=1,m=-1,m_(s)=-1/2`

SOLUTION :For 4P, n=4 ,l=1 ,m=-1,0,+1
`m_(s)=+1/2` or `-1/2`. As l=1 , m cannot be EQUAL to 2.
Discussion
8497.

Zr + 2I_2toZr I_4overset(1800k)toZr+ 2I_2This sequence of reactions involved in

Answer»

MOND's process for refining of ZIRCONIUM
Van Arkel METHOD for refining of zirconium
Zone refining of zirconium
Refining of zirconium by destillation

ANSWER :B
Discussion
8498.

Who observed that when the nucleus of uranium atom was bombarded with fast moving neutrons, it becomes so unstable that it is immediately broken into two nuclei of nearly equal mass besides other fragments

Answer»

J.J. Thomson
Chadwick
Einstein
HAHN and Strassmann

Solution :Hahn and Strassmann DISCOVERED the PHENOMENON of NUCLEAR FISSION in 1939
Discussion
8499.

What is the ratio of product gases, nitric oxide and nitrogen dioxide formed when phosphorus is treated to nitric acid?

Answer»


ANSWER :1:1
Discussion
8500.

What is crystal field splitting?

Answer»

SOLUTION :The splitting of FIVE degenerate d-orbitals of the transition METAL ion into different SETS of orbitals (`t_(2(g)) and e_(g)`) having different energies in the presence of ligands in the complex is called crystal field splitting.
Discussion