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1501.

Which of the following is not chemical twin?

Answer»

Mo-W
Nb-Mo
Nb-Ta
Zr-Hf

Answer :B
Discussion
1502.

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization) ?

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`[BF_(4)^(-)`and`NH_(4)^(+)]`
`[BCl_(3)` and `BrCl_(3)]`
`[NH_(3)`and`NO_(3)^(-)]`
`[NF_(3)`and`BF_(3)]`

Solution :`BF_(4)^(-)`and `NH_(4)^(+)` INVOLVE `SP^(3)` hybridisation and are tetrahedral.
Discussion
1503.

Whatarehormones ? Give examples.

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Solution :HORMONE isorganicsubstance thatis screted byon TISSUE. It isan intercellularsignalingmolecule .
Virtually every procoseis a complex organism is regulated byone or more hormones .
EXMPLE ,insulin , epinephrine , estrogen, androgent etc.
Discussion
1504.

Which is the strongest acid ?

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`H_(2)S`
`H_(2)SE`
`H_(2)O`
`H_(2)TE`

ANSWER :D
Discussion
1505.

Which can be prepared by Kolbe's electrolysis?

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`C_2H_6`
`C_3H_8`
`C_4H_8`
`C_2H_2`

ANSWER :A::B::C::D
Discussion
1506.

Which of the following will be easily nitrated

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`CH_3NO_2`
`C_6H_5NO_2`

SOLUTION :The presence of an electron-releasing groups (+I group) e.g., `-CH_3, -OH, -NH_2` etc. makes the process of NITRATION EASIER. So `C_6H_5CH_3` will be EASILY nitrated .
Discussion
1507.

The substance used in the thermite process for reducing metal oxide is ________.

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ALUMINIUM
thorium
heated PT gangue
carbon

Answer :A
Discussion
1508.

Which one of the following statement is not true

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Clean water would have a BOD value of 5 ppm.
Fluoride DEFICIENCY in drinking water is harmful. Soluble fluoride is often USED to bring its concentration upto 1 ppm
When pH of rain water is HIGHER than 6.5, it is called acid rain
Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm

Answer :D
Discussion
1509.

The yellow coloured solution of chromate salt changes to orange colour on acidification due to the formation of :

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`CR^(3+)`
`Cr_(2)O_(7)^(2-)`
`CrO_(4)^(-)`
`Cr_(2)O_(3)`

Solution :`2CrO_(4)^(2-) + 2H^(+) underset("alkali")OVERSET("acid")to underset("Orange")Cr_(2)O_(7)^(2-) + H_(2)O`
Discussion
1510.

What is the name of most effective sulpha drug ?

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SOLUTION :SULPHANILAMIDE and SULPHADIAZINE .
Discussion
1511.

Which of the following biphenyls is optically active?

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Solution : is optically ACTIVE DUE to absence of plane of symmetry and CENTER of symmetry.
Discussion
1512.

Which is a monosaccharide among the following?

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SUCROSE
CELLULOSE
MALTOSE
GLUCOSE

SOLUTION :Glucose
Discussion
1513.

The S - S - S bond angle in S_(8) molecule is

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`109.5 ^(@)`
`105^(@)`
`120^(@)`
`60^(@)`

ANSWER :B
Discussion
1514.

Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?

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Quartz glass
Quartz
SILICON
Both (a) and (b)

Solution :Amorphous silicon is used as best PHOTOVOLTAIC material AVAILABLE for CONVERSION of sunlight into electricity
Discussion
1515.

Which one is more stable and why?

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ANSWER :First is more STABLE because of LESS steric repulsion between groups at equitorial POSITION.
Discussion
1516.

What is the difference between a collodial sol, gel and emulsion ?

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Solution :In a COLLOIDAL sol, the dispeersed phase is a soolid and the DISPERSION mdium is a LIQUID. In a gel, it is opposite. In an EMULSION, both the dispersed phase and dispersion medium are liquids.
Discussion
1517.

Zero inductive effect is shown by:

Answer»

`C_6H_5 -`
`-H`
`CH_3-`
`CL-`

ANSWER :B
Discussion
1518.

Which of the following acts as stimulator?

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VITAMIN
Enzyme
Hormone
Carbohydrate

Answer :C
Discussion
1519.

Write thechemical reactionfor reactions involved in synthesis of Bakelite .

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SOLUTION :
Discussion
1520.

Write the IUPAC name of the compound : CH_(3)-underset(CH_(3))underset("|")"CH"-CO-underset(CH_(3))underset("|")"CH"-CH_(3)

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SOLUTION :2, 4 - Dimethylpentan -3- ONE.
Discussion
1521.

Which of the following is a gas:

Answer»

METHANE thiol
Ethane thiol
Isobutyl thiol
Propyl thiol

Answer :A
Discussion
1522.

What is Tollen's reagent? Write one usefulness of this reagent.

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Solution :Tollens reagent is AMMONICAL silver NITRATE solution `[Ag(NH_(3))_(2)]OH`
It is used to DISTINGUISH between aldehydes and ketones.
Discussion
1523.

Write IUPAC name of [Ag(NH_(3))_(2)]Cl.

Answer»

SOLUTION :Diamminesilver(I) CHLORIDE.
Discussion
1524.

Which one of the following reaction occurs at the cathode

Answer»

`2OH^(-) RARR H_(2) O + 1/2 O_(2) + 2e^(-)`
`Ag(s) rarr Ag^(+) + e^(-)`
`Fe^(2+) rarr Fe^(3+) + R^(-)`
`Cu^(2+) + 2e^(-) rarr Cu(s)`

ANSWER :D
Discussion
1525.

The test used to distinguish alcohols from one another is known as

Answer»

Hinsberg's test
2,4-DNP test
Iodoform test
Lucas test.

Answer :D
Discussion
1526.

What are tranqilizers ?

Answer»

Solution :Class of CHEMICALCOMPOUNDS USED for the treatment of STRESS.
OR
Any suitable statement
Detailed Answer :
Tranquilizers are the DRUGS used to reduce stress, mild and severs mental disease.
Discussion
1527.

Write the name of the compound with R//S-designation obtained when (R)-2 bromocatane is subject to alkaline hydroysis (S_(N)2).

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SOLUTION :(S)-2-octanol.
Discussion
1528.

Which step is not involved in hydrometallurgical process ?

Answer»

`Cu_(2)S + 2Cu_(2)O rarr 6 CU + SO_(2)`
`CuSO_(4) + Fe rarr Cu + FeSO_(4)`
`CuFeS_(2)+2H_(2)SO_(4) rarr CuSO_(4) + FeSO_(4) + H_(2)S`
`CuCO_(3) + H_(2)SO_(4) rarr CuSO_(4) + CO_(2) + H_(2)O`

Answer :A
Discussion
1529.

Which yields isopropyl methyl ether with little or no by-products?

Answer»

`(CH_(3))_(2)CHO^(-)Na^(+)+CH_(3)Irarr`
`CH_(3)O^(-)Na^(+)+(CH_(3))_(2)CHIrarr`
`(CH_(3))_(2)CHOH+CH_(3)OH overset(H_(2)SO_(4))RARR`
All FO these

Solution :`(CH_(3))_(2)CHO^(-)overset(+)Na+CH_(3)Irarr (CH_(3))_(2)CH-O-CH_(3)+NAI`
Discussion
1530.

The total energy of molecules is divided equally amongst the various degrees of freedom of a molecule. The distribution of kinetic energy along x, y, z axis are E_(K_(x)), E_(K_(y)), E_(K_(z)) Total K.e =E_(K_(x)) + E_(K_(y)) + E_(K_(z)) Since the motion of molecule is equally probable in all the three directions, therefore E_(K_(x)) = E_(K_(y)) = E_(K_(z)) =1/3 E_(K) =1/3 xx 3/2 kT = 1/2 kT, where k =R/N_(A) = Botzman constant. K.E. = 1/2 kT per molecule or =1/2 RT per mole. In vibration motion, molecules possess both kinetic energy as well as potential energy. This means energy of vibration involves two degrees of fiuedom. Vibration energy =2 xx 1/2kT =2 xx 1/2RT [therefore two degrees of freedom per mole] If the gas molecules have n_(1) translational degrees of freedom, n_2 rotational degrees of freedom and n_(3) vibrational degrees of freedom, that total energy = n_(1)[(kT)/2] + n_(2) [(kT)/2] + n_(3) [(kT)/2] xx 2 Where 'n' is atomicity of gas. The rotational kinetic energy of H20 molecule is equal to

Answer»

`3/2 KT`
`1/2 kT`
kT
2kT

ANSWER :A
Discussion
1531.

Which of the following sugars can be used to prepare glucose on a large scale ?

Answer»

Cellulose
Cane sugar
Galactose
Starch

Answer :A::C::D
Discussion
1532.

Which one of the following is a cyclic oxoacid ?

Answer»

<P>`H_(4) P_2O_7`
`H_(4)P_(2)O_6`
`H_(3)P_(3)O_9`
`H_(5)P_(5)O_(15)`

Solution :Cyclic OXOACID `(HPO_3)_3 "(or) " H_3P_3O_9`
Discussion
1533.

Two reactions A rarr Products and Brarr products have rate constants k_(A) and k_(B) respectively at 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)` WILLBE greater than `k_(B)`
at lower temperature `k_(A)` and `k_(B)` will be close to each other in magnitude
as temperature increases `k_(A)` and `k_(B)` will become close to each other INMAGNITUDE .
at lower temperature `k_(b) gt k_(A)`

ANSWER :B
Discussion
1534.

Which compound is formed when chloroform is exposed to air in presence of light?

Answer»

SOLUTION :PHOSGENE
Discussion
1535.

What is piback bonding?

Answer»

SOLUTION :(i)In metal carbonyls , the bond between metal atom and the carbonyl ligand consists of two components
(ii) The first component is an electron pair donation from the carbon atom of carbonyl ligand into a vacant d-orbital of central metal atom.
(ii) This electron pair donation forms ` M overset(sigma" bond ")leftarrowCO ` sigma bond. This sigma bond formation increases th electron dentisity in metal d ORBITALS and makes the metal electron RICH .
(IV) In order to compensate for this increased electron density ,a field metal d-orbital interacts with the empty `pi*` orbital on the carbonyl ligand and transfers the added electron density back to the ligand.
Discussion
1536.

Which of the following has lowest magnetic moment ?

Answer»

`CU^(2+)`
`Ni^(2+)`
`Fe^(2+) `
`CR^(3+)`

ANSWER :A
Discussion
1537.

Which of the following ions can be separated by using NH_(4)CI and NH_(4)OH?

Answer»

`Fe^(+3)` and `Cr^(+3)`
`Cr^(+3)` and `Co^(+2)`
`Cr^(+3)` and `Al^(+3)`
`Al^(+3)` and `Ba^(+2)`

SOLUTION :`NH_(4)Cl+NH_(4)OH` is used to separation of IIIrd GP contains
Discussion
1538.

What is the approximate mass of the atmosphere of the earth? Assume the radius of the earth to be 6370 km.

Answer»

Solution :SURFACE are of the earth `=4pir^2`
ATMOSPHERIC pressure = 1 atm = `101325 Pa`
`5.27 xx 10^18 kg`
Discussion
1539.

Which of the following serves as an indicator of atmospheric pollution

Answer»

Ferns
Liverworts
Hornworts
EPIPHYTIC lichens

Solution : Because lichens are very sensitive to atmospheric POLLUTION (SPECIALLY `SO_2` pollution).
Discussion
1540.

Write short note on the following : (i) Carbylamine reaction (ii) Diazotization (iii) Hoffmann's bromide reaction (iv) Coupling reaction

Answer»

Solution :(i) CARBYLAMINE reaction : When primary amine(aromatic of aliphatic) warned with chloroform and alc. KOH, isocyanides are formed which can be identified by their OFFENSIVE smell. This test is used to identifythe presence of primary amine or chloroform
.
(ii) Diazotization : When primary aromatic amine is treated with `NaNO_(2)` and HCI at 273-278 K, diazonium salt is obtained. This reaction is known as diazotization.
Benzenediazonium chloride is a very important synthetic compound, which can be changed into heloarenes, phenol, cyanobenzene, BENZENE etc.

(III) Hoffmann.s bromide reaction : When any primary amide (alphatic or aromatic) is treated with bromine and alkali, it gives the amine with one less carbon atom.

This reaction is used to reduce one carbon atom from a compound. ##
(iv) COUPLING reaction : When benzenediazonium chloride is treated with phenols or aromatic amines, azo dyes are produced in which diazo `(-N = N-)` group is retained. Coupling reactions generally take place at p-position of phenol or aromatic amines.
(v) Ammonolysis : Reaction of alkyl halides with ammonia is known as ammonolysis. Ammonolysis generally gives the mixture of `1^(@), 2^(@), 3^(@)` amines and quaternary ammonium salt.
Discussion
1541.

Which of the following constitutes the genetic material of the cell ?

Answer»

NUCLEIC acids
Proteins
Lipids
Carbohydrates

Answer :A
Discussion
1542.

Whichof the followingntiroalkanecan giveonlybluecolurednitroso- alkanewith HNO_(2)

Answer»

`CH_(3)-NO_(2)`
`CH_(3)- OVERSET(H)overset(|)underset(CH_(3))underset(|)(C )- NO_(2)`
`(CH_(3))_(3)C - NO_(2) `
`C_(2)H_(5) NO_(2)`

Solution :
Discussion
1543.

What is the reaction occuring at the anode in Duw's process for the extraction of sodium?

Answer»

`4OH^(-) to 2H_(2)O+O_(2)+4E^(-)`
`Na^(+) +e^(-) to Na`
`2CL^(-) to Cl_(2) 2e^(-)`
`NAH to Na^(+)+OH^(-)`

Answer :C
Discussion
1544.

The total number of lone pairs of electrons present in a S_8 molecule.

Answer»

8
16
12
4

Answer :B
Discussion
1545.

The relative rates of reaction with concentrated H_(2)SO_(4) of the following is (I) (II) (III)

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`I GT II gt III`
`II gt I gt III`
`I gt III gt II`
`II gt III gt I`

ANSWER :D
Discussion
1546.

Which of the following is not a neutral oxide ?

Answer»

CO
`NO `
`SO_2`
`N_2O`

ANSWER :C
Discussion
1547.

Which of the following salt is alkaline in water

Answer»

`C Cl_(4)`
`O_(2)`
NABR
`CHBr_(3)`

Solution :It is completely ionized in WATER because it is ionic salt.
Discussion
1548.

Write the essential conditions for geometrical isomerism.

Answer»


ANSWER :Essential CONDITIONS for geometrical ISOMERISM are
(1)Restricted rotation must present.
(2) Two different groups must be present on both restricted atoms.
(3) Groups responsible to SHOW geometrical isomerism must be NEARLY in the same plane.
Discussion
1549.

Which of the following is not a sugar substituent?

Answer»

Sorbitol
mannitol
xylitol
CRESOL

SOLUTION :cresol
Discussion
1550.

Two elements A and B form compounds having molecular formula AB_(2) and AB_(4). When dissolved in 20 g of benzene (C_(6)H_(6)), 1 g of AB_(2) lowers the freezing point by 2.4 K whereas 1.0 g of AB_(4) lowers it by 1.3 K. The molal depression constant of benzene is "5.1 K kg mol"^(-1). Calculate atomic masses of A and B.

Answer»

Solution :Applying the formula, `M_(2)=(1000K_(F)w_(2))/(w_(1)xxDeltaT_(f))`
`M_(AB_(2))=(1000xx5.1xx1)/(20xx2.3)"110.87 g mol"^(1),M_(AB_(4))= (1000xx5.1xx1)/(20xx1.3)= "196.15 g mol"^(-1)`
Suppose atomic masses of A and B are 'a' and 'b' RESPECTIVELY. Then
Molar mass of `AB_(2)=a+2b=110.87" g mol"^(-1)"...(i)"`
Molar mass of `AB_(4)=a+4b="196.15 g mol"^(-1)"...(ii)"`
EQN. (ii) - Eqn. (i) gives 2 b = 85.28 or b = 42.64
SUBSTITUTING in eqn. (i), we GET `a+2xx42.64=110.87 or a=25.59`
Thus, Atomic mass of A = 25.59 u, `""` Atomic mass of B = 42.64 u
Discussion