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17701.

What is tincture of iodine ? What is its use ?

Answer»

Solution :`2 - 3%` solution of IODINE in alcohol and water is called tincture of iodine. It is a powerful ANTISEPTIC. It is applied on WOUNDS.
Discussion
17702.

Which of the following has highest tendency for M^(+2) rar M

Answer»

V
Cr
Co
Cu

Answer :D
Discussion
17703.

What is the equilibrium constant, K for the following reaction at 400 K?2NOCl(g) iff 2NO(g) + Cl_2(g) Delta H = 77.2 kJ "mol"^(-1) andDelta S = 122 JK^(-1) "mol"^(-1)at 400 K

Answer»

`1.95 XX 10^(-4)`
`7.4 xx 10^(-4)`
`2.28 xx 10^(-3)`
`1.48 xx 10^(-5)`

Solution :`1.95 xx 10^(-4)`
Discussion
17704.

Which of the following compounds has peroxide linkage?

Answer»

`Pb_(2)O_(3)`
`CO_(2)`
`SiO_(2)`
`PbO_(2)`.

Answer :D
Discussion
17705.

Write the IUPAC name of the C_6 H_5 - O - C_7 H_(15) (n^-)

Answer»

SOLUTION :1-Phenoxypheptane
Discussion
17706.

What is the most likely boiling point of an equimolar mixture of hexane, C_(6)H_(14), and heptane, C_(7)H_(16)?

Answer»

below `69^(@)C`
between `69^(@)C` and `98^(@)C`
`69^(@)C`
`98^(@)C`

ANSWER :B
Discussion
17707.

Which of the following halogens does not form oxyacid

Answer»

Fluorine
Chlorine
Bromine
IODINE

Solution :Fluorine does not form oxyacids because it is more ELECTRONEGATIVE than OXYGEN.
Discussion
17708.

Which of the following is incorrect match the Bravais lattices of given crystal system:

Answer»

TETRAGONAL `to` BODY centred
Hexagonal `to` End centred
MONOCLINIC `to` end centred
ORTHORHOMBIC `to` Primitive

Answer :B
Discussion
17709.

Which of the following species exhibits the diamagnetic behaviour ?

Answer»

`O_(2)^(+)`
`O_(2)`
NO
`O_(2)^(2-)`

Solution :`O_(2)^(2-)`is DIAMAGNETIC.
`KK (sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(sigma_(2p_(z)))^(2)(pi_(2p_(X)))^(2)(pi_(2p_(y)))^(2) (pi_(2p_(x))^(*))^(2)(pi_(2p_(y))^(**))^(2)`.
Discussion
17710.

Which of the following curves represents a second-order reaction? ('a' is the concentration of the reactant)

Answer»




ANSWER :B
Discussion
17711.

Which of the following is not a polymer ?

Answer»

PROTEIN
CELLULOSE
GLUCOSE
NUCLEIC acid

Solution :Glucose
Discussion
17712.

When a coordination compound CrCl_(3).6H_(2)O is mixed with AgNO_(3), 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula ofthe complex (ii) IUPAC name of the complex.

Answer»

Solution :(i) For one mole of the compound, two moles of AgCl are precipitated which shows that three two ionizable CHLORIDE ions in the COMPLEX. Also remembering that Cr has a coordination number of 6 the structural FORMULA of the complex is `[CRCL(H_(2)O)_(5)]Cl_(2).H_(2)O`
(ii) Pentaaquachloridochromium (III) chloride monohydrate.
Discussion
17713.

When primary amine reacts with CHCl_(3) in alcholic KOH, the product is:

Answer»

ALDEHYDE
ALCOHOL
CYANIDE
an-isocyanide

ANSWER :A::C::D
Discussion
17714.

Which is more suitable for strong concentrated H_2SO_4:

Answer»

COPPER vessel
Aluminium Vessel
Earthen vessel
Glass vessel

Answer :D
Discussion
17715.

Which of the following is not a semisynthetic polymer?

Answer»

cis-polyisoprene
Cellulose nitrate
Cellulose acetate
Vulcanised RUBBER

Solution :cis-polyisoprene is NATURAL rubber and THUS is a natural POLYMER.
Discussion
17716.

Which of the following ion does not exist

Answer»

`[CuI_(4)]^(2-)`
`VO_(4)^(3-)`
`WP_(4)^(2-)`
`CrO_(4)^(2-)`

ANSWER :A
Discussion
17717.

Which type of drug is veronal ?

Answer»

Antifertility
Antimicrobial
Tranquilizer
Antihistamine 

ANSWER :C
Discussion
17718.

Which of the following is true in respect of adsorption

Answer»

`DeltaGlt0,DeltaSgt0,DELTAHLT0`
`DeltaGlt0,DeltaSlt0,DeltaHlt0`
`DELTAGGT0,DeltaSgt0,DeltaHlt0`
`DeltaGlt0,DeltaSlt0,DELTAHGT0`

SOLUTION :N//A
Discussion
17719.

Which one of the following is known as broad spectrum antibiotic ?

Answer»

Streptomycin
Ampicillin
Chloramphenicol
Penicillin

ANSWER :C
Discussion
17720.

What will be the wavelength of the emitted radiations when an electron jumps from a third orbit to a first orbit in a hydrogen atom? Rydberg constant, R= 109737 cm^(-1)

Answer»

Solution :We have for hydrogen (Z=1)
`(1)/(lamda)= R ((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))`
Here `n_(1)=1 and n_(2)=3`
`THEREFORE (1)/(lamda)= 109737 ((1)/(1^(2)) - (1)/(3^(2)))`
`lamda= 1.025 xx 10^(-5)` cm/wave
Discussion
17721.

Which of the following is bacteriostatic ?

Answer»

Penicillin
ERYTHROMYCIN
AMINO glycoside
ofloxacin

SOLUTION :Erythromycin is BACTERIOSTATIC.
Discussion
17722.

The variation of vapour pressure with temperature is quantitatively studied by ……………equation.

Answer»

SOLUTION :CLAUSIUS - CLAPEYRON
Discussion
17723.

Write two uses of ClO_2

Answer»

Solution :`ClO_2` is USED as:
(i) a BLEACHING agent for paper pulp and textiles. (ii) in WATER TREATMENT.
Discussion
17724.

What is teflon ? How is it prepared ?

Answer»

Solution :Teflon is polytetrafluoroethylene. It is PREPARED by the ACTION of chloroform with antimony trifluoride and hydrofluoric acid, followed by vinyl polymerisation.
`CHCl_3 underset(HF)overset(SbF_3)(rarr)CHF_2Cl underset(-HCl)overset(800^@ C)(rarr)CF_CF_2`
`nCF_2 = CF_2 rarr [-CF_2 - CF_2]_n`.
Discussion
17725.

The Vander Waal's forces are the greatest in

Answer»

Xenon
Argon
Krypton
Neon

Answer :A
Discussion
17726.

Which of the following is not true for themoplasticpolymers ?

Answer»

Thermoplastics are linear polymers .
They soften and melt on HEATING .
Molten POLYMER can be remoulded into anyshape .
they cannot be remoulded into different shape

Solution :Thermoplastics do not have NAY cross -linkages HENCE they are SOFT and can be remoulded after heating .
Discussion
17727.

What is the wave length of ultra violet light of v=5.5xx10^(15)s^(-1) ?

Answer»

SOLUTION :`5.4545xx10^(-8)m`
Discussion
17728.

Which of the following has minimum H-M-H bond angle?

Answer»

`NH_(3)`
`PH_(3)`
`AsH_(3)`
`SbH_(3)`

ANSWER :D
Discussion
17729.

Which of the following is not a concentration technique?

Answer»

LEVIGATION
Froth-flotation
 Leaching
Calcination

ANSWER :D
Discussion
17730.

Which of the following methods is not used for purification of liquids ?

Answer»

Chromatography
Distillation
Steam distillation
Sublimation

Answer :D
Discussion
17731.

Which of the following are coordination isomersof [Co(NH_(3))_(6)][Cr(CN)_(6)]

Answer»

`[Cr(NH_(3))_(6)][CO(CN)_(6)]`
`[Cr(NH_(3))_(4)(CN)_(2)][Co(CN)_(4)(NH_(3))_(2)]`
`[Cr(NH_(3))_(3)(CN)_(3)][Co(NH_(3))_(3)(CN)_(3)]`
none

Solution :In coordination ISOMERISM LIGANDS can exchange.
Discussion
17732.

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

Answer»

`CH_3C=N=S`
`CH_3-O-N=C`
`CH_3 -N=C=S`
`CH_3-N=C=O`

ANSWER :D
Discussion
17733.

What are the raw materials required for the manufacture of terylene?

Answer»

ethylene GLYCOL + terephthalic ACID
PHTHALIC auhydride + phenol
adipic acid + hexamethylene diamine
phenol + METHANAL

SOLUTION : ethylene glycol + terephthalic acid
Discussion
17734.

Total number of compound among the followinng having zero dipolemoment is/are C Cl_(4),CH_(3)Cl,CH_(2)Cl_(2),CHCl_(3), o-, m-and p-dichlorobenzene, benzyl chloride, benzal dichloride, benzotrichloride.

Answer»


SOLUTION :Two. `C Cl_(4) and ` p-dichlorobenzene being symmetrical have ZERO DIPOLE moment.
Discussion
17735.

What is the covalency of 'N'in nitrogen pentoxide ?

Answer»

Solution :NUMBER of .O atoms bonded to each .N. atom in `N_(2)O_(5)` is 2.5. Hence the covalency of .N. is calculated as 5, based on OXIDE THEORY.
But by the examination of the STRUCTURE of `N_(2)O_(5)`, one can observe that .N. forms only 4 bonds. Its covalency in nitrogen pentoxide is 4.
Discussion
17736.

Write IUPAC name of the following : ""CH_(3)-NH-overset(1)(C)H_(2)-underset(underset(NO_(2))(|))(overset(2)(C)H)-overset(3)(C)H_(3)

Answer»


ANSWER :2-Nitro-N-methylpropanamine.
Discussion
17737.

Which is known as blister copper ?

Answer»

PURE copper
98% copper
Ore of copper
Alloy of copper

Answer :B
Discussion
17738.

The temperature coefficient of most of the reaction lies between:

Answer»

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

Answer :B
Discussion
17739.

Which ore has more than one metal present in it ?

Answer»

COPPER PYRITE 
Iron pyrite 
Calamine 
SIDERITE 

Solution :Copper pyrite is `CuFeS_2`
Discussion
17740.

Two reactions R_(1)" and "R_(2) have identical perexponential factors. Activation energy of R_(1) the rate constants for reactions R_(1) and R_(2) respectively at 300 K, then ln (k_(2)//k_(1)) is equal to (R=8.314" J mole"^(-1)K^(-1))

Answer»

6
4
8
12

Solution :`k_1=Ae^(-E_(a_(1))//RT), K_2=Ae^(-E_(a_(2))//RT)`
`:.""k_2/k_1=E^(1/(RT)(E_(a_(1))-E_(a_(2)))`
or`In k_2/k_1=(E_(a_(1))-E_(a_(2)))/(RT)=(10xx10^3)/(8.314xx300)=4`
Discussion
17741.

The reagent NH_4CI and aq. NH_3 will precipitate

Answer»

 `BI^(3+)`
`AL^(3+)`
 `Zn^(2+)`
`Mg^(2+)`

ANSWER :B
Discussion
17742.

Total order of the reaction X+Yto XY is 3. The order of reaction with respect to X is 2. State differential rate equation for the reaction.

Answer»

`(-d[X])/(dt)=K[X]^(3)[Y]^(0)`
`(-d[X])/(dt) = k[X]^(2)[Y]`
`(-d[X])/(dt) = k[X]^(0)[Y^(')]^(3)`
`(-d[X])/(dt) = k[X][Y]^(2)`

Solution :c) it is the correct answer.
Discussion
17743.

The reactivity order of halide ion in alkyl halide is :

Answer»

`F gt a gt BR gt I`
`Cl gt F gt Br gt I`
`I gt Br gt a GTF`
`Br gt I gt a gt F`

Answer :C
Discussion
17744.

The shape of ClO_3^- ion is:

Answer»

tetrahedral
trigonal planar
triangular pyramidal
trigonal bypyramidal

Answer :B
Discussion
17745.

Which of the following is used as scavenger in metallurgy?

Answer»

Na
K
Ca
Zn

Solution :CALCIUM is USED as a scavenger to remove LAST traces of dissolved `N_2,O_2" and "S` from metal in the COURSE of their EXTRACTION.
Discussion
17746.

Writethe namesandstructureof the monomers of the followingpolymers : Naturalrubber .

Answer»

SOLUTION :The MONOMER of naturalrubber is ISOPRENE i.e., 2 - methylbut -1,3-diene or `CH_(2) = underset(CH_(3)) underset(|)(C) - CH = CH_(2)`
Discussion
17747.

Which of the following element combination will form ionic compunds ?

Answer»

2 only
3 only
2 and 3only
1,2 and 3

Solution :An ionic is formed when one of the atoms can donate electrons to achive the inert gas ELECTRON configruation and the other ATOM need electron to achieve the inert gas electron configureation ionic bond if formed between metals and NON metals
Discussion
17748.

The reagent NH_(4)CI and aqueous NH_(3) precipitates:

Answer»

`CA^(2+)`
`Al^(3+)`
`MG^(2+)`
`ZN^(2+)`

ANSWER :B
Discussion
17749.

Which of the following is most acidic-

Answer»

ETHYNE
Propyne
`1-`Butyne
`2-`Butyne

Solution :Because etyne gives most STABLE anion.
Discussion
17750.

When there is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT ?

Answer»

at HIGH TEMPERATURE and LOW pressure
at low temperature and high pressure
at high temperature and high pressure
at low temperature and low pressure

Answer :B
Discussion