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16601.

The type of bond expected to be formed atoms between of two elements in interstitial compounds is

Answer»

COVALENT
Ionic
Metallic
None

Answer :D
Discussion
16602.

Zeise's salt is

Answer»

`[FE(C_(5)H_(5))_(2)]`
`[Pb(C_(2)H_(5))_(4)]`
`K[PtCl_(3)(C_(2)H_(4))]`
`[Ni(CO)_(4)]`

Answer :C
Discussion
16603.

Whichis the lastelementin theseriesof theactinoids ? Writethe electronicconfigurationof thiselementcommenton thepossibleoxidationstateof thiselement.

Answer»

Solution :`LR Z= 103` , is thelast elementof actionoidseriesitselectronicconfigurationis `[RN]^(86)5F^(14) 6d^(1)7s^(2)`
thepossibleoxidationstateshownby isit + +3
Discussion
16604.

Two possible stereo-structures of CH_(3)CHOH. COOH, which are optically active, are called :

Answer»

ENANTIOMERS
MESOMERS
DIASTEREOMERS
Atropisomers

SOLUTION :
Both are enantiomers.
Discussion
16605.

Which of the following is the main component of heavy oil fraction of coal tar?

Answer»

NAPHTHOL and cresol
Phenol
Touluence
`BETA`-Napthylamine.

Solution :N/A
Discussion
16606.

What is the action of acidified potassiumdichromate onhydrogen sulphide (H_(2)S) ?

Answer»

Solution :When HYDROGEN sulphide `(H_(2)S)` gas is passed into acidified potassium dichromate `(K_(2)Cr_(2)O_(7))` solution, `H_(2)S` is oxidised to a pale YELLOW SOLID of sulphur and orange coloured solution becomes green.
`underset("Orange")(K_(2)Cr_(2)O_(7))+4H_(2)SO_(4)+3H_(2)S to K_(2)SO_(4)+underset("Green")(Cr_(2)(SO_(4))_(3))+underset("Pale yellow")(7H_(2)O+3S)`
Discussion
16607.

Which of the following monomers form biodegradable polymers ?

Answer»

3-hydroxybutanoic acid `+3` -hydroxypentanoic acid
Glycine `+ in ` -aminocaproic acid
Ethylene GLYCOL `+` PHTHALIC acid
Caprolactum

Answer :A::B
Discussion
16608.

The unit of molar conductivity is _______.

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`8.76xx 10^(4) "ohm"^(-1) "CM"^(-1)`
`8.76xx 10^(-4) "ohm"^(-1) "cm"^(-1)`
`8.76xx 10^(-3) "ohm"^(-1) "cm"^(-1)`
`8.76xx 10^(-2) "ohm"^(-1) "cm"^(-1)`

ANSWER :C
Discussion
16609.

Which one of the following is a bacteriostatic drug ?

Answer»

Aminoglycosides
Penicillin-G
Ofloxacin
TETRACYCLINE

Solution :Tetracycline is BACTERIOSTATIC ANTIBIOTIC
Discussion
16610.

Which one of the following is called Lucas reagent?

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Conc. HCI + Anhydrous `ZnCl_2`
Conc. HCL + Anhydrous `AlCl_3`
`LiAlH_4 + H_2O`
COLD DILUTE ALKALINE `KMnO_4`

Solution :Conc. HCI + Anhydrous `ZnCl_2`
Discussion
16611.

Two complex compounds with same representation [CoCl_(2)(NH_(3))_(4)]Cl have different colours then select the correct statement :

Answer»

Both are structural isomers of each other
Both are STEREOISOMERS of each other
Both have same CONDUCTIVITY relative to ONE mole of electrolyte
Both (b) and (C ) are correct.

Answer :D
Discussion
16612.

Which acid is formed on hydrolysis of ethyl acetate ?

Answer»

Solution :ACETIC ACID is formed on HYDROLYSIS of ETHYL acetate.
Discussion
16613.

Which is not the correct order of the stated property?

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`Ba gt Sr gt Mg`: Atomic RADIUS
`F gt O gt N` : First ionisation energy
`Cl gt F gt I` : Negative electron gain ENTHALPY
`O gtSe gt Te` : Electronegativity.

Solution :First ionisation energy of nitorgen is greater than oxygen because of half FILLED electronic configuration.
`N:1s^(2)2s^(2)2p^(3)""O:1s^(2)2s^(2)2p^(4)`
Discussion
16614.

Which of the following forms with an excess of CN^-ions, a complex having co-ordination number two?

Answer»

`Cu^+`
`Ag^+`
`Ni^(2+)`
`FE^(2+)`

ANSWER :B
Discussion
16615.

You have 0.1gram-atom of a radioactive isotope ""_(Z)^(A)X (half-life =5 days). How many number of atoms will decay during the eleventh day?

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Solution :Let the amount of X after 10 days be x moles
We have, `lamda= (2.303)/(t) "log" (N^(0))/(N)= (0.6932)/(t_((1)/(2)))`
or `(2.303)/(10)"log" (0.1)/(x)= (0.6932)/(5)`
or x= 0.025 moles
`therefore` number of atoms `=0.025 xx 6.022 xx 10^(23)`
`=1.505 xx 10^(22)`
THUS the number of atoms on the ELEVENTH day is `1.505 xx 10^(22)`
Now, no. of atoms DECAYING on the eleventh day = no. of DISINTEGRATION per day
`= -(d(N))/(dt)= lamda (N)= (0.6932)/(t_((1)/(2))) xx N`
or `-(d(N))/(dt)= (0.6932)/(5) xx 1.505 xx 10^(22)= 2.086 xx 10^(21)`
Discussion
16616.

When chlorine water is exposed to sunlight, O_2 is liberated, Hence:

Answer»

HYDROGEN has little AFFINITY to `O_2`
Hydrogen has more affinity to `O_2`
Hydrogen has more affinity to Chlorine
It is reducing agent

Answer :C
Discussion
16617.

What is the main reason for the fact that carboxylic acids can undergo ionization

Answer»

Absence of `alpha`-hydrogen
Resonance stabilisation of the carboxylate ion
High REACTIVITY of hydrogen
Hydrogen BONDING

SOLUTION :After the release of the `H^(+)` ion the over `"RCOO"^(-)` ion is resonance stabilised is also attained as both canonical STRUCTURES of the carboxylate ion are equivalent in their potential ENERGY.
Discussion
16618.

Which of the following vitamins has isoprene units in its structure

Answer»

VITAMIN A
Vitamin C
Vitamin `B_2`
Vitamin D

Answer :A
Discussion
16619.

When oxygen is passed through a solution of Na_2SO_3 we get:

Answer»

`Na_2SO_4`
`Na_2S`
`NaHSO_4`
NaH

Answer :A
Discussion
16620.

The standard reduction potential of three metallic cations X,Y and Z are +0.52, -0.52, 3.03 and -1.18 V respectively. The order of reducing power is :

Answer»

`Y gt Z gt X`
`X gt Y gt Z`
`Z gt Y gt X`
`Z gt X gt Y`

SOLUTION :(a) is the correct answer.
Discussion
16621.

The structural formula of Indigo dye is

Answer»




SOLUTION :The class of INDIGO dye is Indigoid or VAT dye. Indigo dyes are insoluble in WATER.
Discussion
16622.

Which of the following isomeric compounds is most reactive ?

Answer»




all are EQUALLY reacive

ANSWER :A
Discussion
16623.

What are the applications of the fuel cells ?

Answer»

SOLUTION :Fuel cells have been used in the space programme providing electrical ENERGY for a long duration.
(2) The fuelcells have been used in automobiles on experimental basis.
(3) In case of `H_(2)-O_(2)` fuel CELL, used in spacecraft, the water produced is used for drinking astronauts.
(4) The fuel cellsusing methanol as a fuel for combustion are used in electronic produts such as cell phones and laptop computers.
(5) The fuel cells have been may potential applicationsas power GENERATORS for domestic and industrial uses.
Discussion
16624.

Which of the following can not be made by Williamson's reaction ?

Answer»

ethoxyethane
methoxyethane
1-methoxypropane
2-(1, 1-dimethylethoxy)propane

Answer :D
Discussion
16625.

Which gas turns lead acetate paper black:

Answer»

`SO_2`
`O_2`
`H_2S`
`O_3`

ANSWER :C
Discussion
16626.

To a solution of an acid radical, MgSO_4 solution is added and white ppt. appear only on heating. The acid radical may be

Answer»

`CO_(3)^(2-)`
`SO_(3)^(2-)`
`HCO_(3)`
`C_(2) O_(4)^(2-)`

Solution :`2 NaHCO_(3) + MgSO_(4) to underset("SOLUBLE")(Mg(HCO_(3))_(2)) + Na_(2) SO_(4) Mg (HCO_(3))_(2) OVERSET(Delta)(to) underset("White ppt.") (MgCO_(3)) + H_(2) O + CO_(2)`
Discussion
16627.

Which of the following f-block element are not able to oxocations ?

Answer»

cerium and samarium
URANIUM and thorium
neptunim and protactium
NOBELIUM and fermium

ANSWER :A
Discussion
16628.

Which of the following is not used to determine cell constant ?

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`10^(-2)` M KCl
`10^(-1)`M KCl
1 M KCl
Saturated KCl

SOLUTION :(d) Saturated solution of KCl cannot be USED to determine the VALUE of cell constant.
Discussion
16629.

When 1.5 gm phenol is disolved in 100 gm of toluene, decrease in freezing point is 0.56 K is observed. If its association is dimeric in nature, then find out percentage of association. [K_(f)=4" K kg mol"^(-1)].

Answer»


ANSWER :`25%`
Discussion
16630.

What are co-ordination compounds ?

Answer»

Solution :These are compounds containing at LEAST one complex ION in which a central metal ATOM or ion is SURROUNDED by a NUMBER of ions or molecules through co-ordinate bonds.
Discussion
16631.

The synthesis of alkyl fluoride is best accomplished by:

Answer»

FINKELSTEIN reaction
Swart's reaction
Free RADICAL mechanism
Sandmeyer's reaction.

Solution :It is the correctn ANSWER.
Discussion
16632.

Which metalgives asft when is saltheated with Na_(2)CO_(3) solid and Co(NO_(3))_(2) ojn a charcoal piece?

Answer»

Cu
Mg
AI
Zn

Solution :`CoAIO_(2)` is formedwhich is blue .FOLLOW cobaltnitrate CHARCOAL TEST
Discussion
16633.

Which of the following will give maximum number of isomers ?

Answer»

`[CO (NH_(3))_(4)Cl_(2)]`
`[Ni (en) (NH_(3))_(4)]^(2+)`
`[Ni (C_(2)O_(4))(en)_(2)]^(2-)`
`[Cr(SCN)_(2)(NH_(3))_(4)]^(+)` .

Solution :`[Cr(SCN)_(2)(NH_(3))_(4)]^(+)` exhibits linkage, geometrical and optical ISOMERISM.
Discussion
16634.

Writethe Haworth projection formulafor alpha - D- (+)- Glucopyranose (trans) and beta-D-(+)-Glucopyranose (cis).

Answer»

SOLUTION :
Discussion
16635.

Which is false

Answer»

GLUCOSE is a disaccharide
starch is a polysaccharide
Glucose and fructose are not anomers
Invert SUGAR consists of glucose and fructose

Solution :Glucose is a monosaccarides having chemical composition `C_(6)H_(12)O_(6)`
Discussion
16636.

Which branched chain isomer of the hydrocarbon with molecular mass 72 u gives only one isomer of mono substituted alkyl halide ?

Answer»

Neopentane
Isohexane
NEOHEXANE
Tetiary butyl CHLORIDE

Solution :As the molecular mass indicates it should be pentane and neopentane can only form one mono substituted alkyl halide as all the HYDROGENS are equivalent in neopentane.
`underset("Neopentane")(CH_(2)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-CH_(3))overset(" chlorinastion ")RARR underset("derivative possible")underset("Only one mono-chloro")(CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-CH_(2)CL)`
Discussion
16637.

Write the products in the following: CH_(3)-underset(CH_(3))underset(|)CH-underset(OH)underset(|)CH-CH_(3) overset(HBr)to

Answer»

SOLUTION :`CH_(3)-UNDERSET(CH_(3))underset(|)overset(BR)overset(|)C-CH_(2)-CH_(3)`
Discussion
16638.

Which one of the following statements is correct when SO_(2) is passed through acidified K_(2)Cr_(2)O_(7) solution ?

Answer»

The solution TURNS blue
The solution is decolourised
`SO_(2)` is reduced
Green `Cr_(2)(SO_(4))_(3)` is formed

Answer :D
Discussion
16639.

Which one of the following is used in cell phone, dry cell in flashlight?

Answer»

ZN - Cu battery
Li - ion battery
Ag - Cu battery
NA, NaCl battery

ANSWER :B
Discussion
16640.

Which of the followig statements is true ?

Answer»

The reaction is fast if the activation energy is LOW
The activation energy of forward reaction can NEVER be greater than that of the backward reaction .
A catalyst INCREASES the RATE of a reaction by decreasing the rate of backward reaction
Reaction rates increase with temperature because the activation energy decreases at high temperature .

ANSWER :A
Discussion
16641.

What is 'C' in the following reaction ? C_(6)H_(5)CN + C_(6)H_(5)MgI underset((ii) H_(3)O^(+)) overset((i) "dryether") toA overset(NH_(2)OH) to B overset(LiAlH_(4)) to C

Answer»

DIPHENYL METHANE
diphenyl methanamine
nitrodiphenyl methane
diphenyl

ANSWER :B
Discussion
16642.

The type of isomerism shown by the complex [CoCl_2(en)_2] is

Answer»

IONIZATION isomerism
Coordination isomerism
Geometrical isomerism
Linkage isomerism

Answer :C
Discussion
16643.

What is the molality of solution consisting of 33.0 mL of benzene (C_(6)H_(6),d=0.877 g mL^(-1)) in 187 mL of hexane (C_(6)H_(14), d= 0.660 g ml^(-1))?

Answer»


SOLUTION :Mass of BENZENE = `33 xx 0.877` g
Mass of benzene `=(28.941)/78 = 0.371`
Mass of hexane `=187 xx 0.66 = 123.42`g
`m=(0.371 xx 1000)/(123.42) = 3.006`
Discussion
16644.

Wrought iron is resistant to rusting and corrosion due to the presence of

Answer»

CEMENTITE `(Fe_(3)C)`
Low percentage of carbon
`CaSiO_(3) & FePO_(4)` Slages
`MnSiO_(3)& FePO_(4)`slages

Answer :4
Discussion
16645.

The value of log (k_(2))/(k_(1)) is equal to

Answer»

`(E_(a))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]`
`(E_(a))/(2.303R)[(T_(1)T_(2))/(T_(2)-T_(1))]`
`(E_(a))/(2.303R)[(T_(2)+T_(1))/(T_(1)T_(2))]`
`(E_(a))/(2.303R)[(T_(1)T_(2))/(T_(1)+T_(2))]`

Solution :The value of `LOG.(k_(2))/(k_(1))`is equal to `(E_(a))/(2.303R)[(T_(2)-T_(1))/(T_(1)T_(2))]`
Discussion
16646.

Which element is obtained in the pure form by van Arkel method

Answer»

ALUMINIUM
TITANIUM
Silicon
Nickel

SOLUTION :Titanium -VAN Arkel METHOD
Discussion
16647.

What are A,B,C in the following reactions, (i) (CH_(3)CO_(2))_(2)Ca overset(Delta)toA (ii) CH_(3)CO_(2)H underset("red P") overset(HI)toB (iii) 2CH_(3)CO_(2)H overset(P_(4)O_(10))toC

Answer»

`A-C_(2)H_(6)`, `B-CH_(3)COCH_(3)`,`C-(CH_(3)CO)_(2)O`
`A-(CH_(3)CO)_(2)O,B-C_(2)H_(6),C-CH_(3)COCH_(3)`
`A-CH_(3)COCH_(3),B-C_(2)H_(6),C-(CH_(3)CO)_(2)O`
`A-CH_(3)COCH_(3),B-(CH_(3)CO)_(2)O,C-C_(2)H_(6)`

Answer :C
Discussion
16648.

What is occlusion ?

Answer»

Solution :The ADSORPTION of GASES on the SURFACE of metals is CALLED OCCLUSION
Discussion
16649.

which of the following statement is not true -

Answer»

Some DISINFECTANTS can be used as ANTISEPTIC at low CONCENTRATION
sulphapyridine is a dynthetic antibacterial
Ampicillin and AMOXYCILLIN are natural antibiotic
Aspirin is ANALGESIC and antipyretic both.

Answer :C
Discussion
16650.

Why are higher ethers insoluble in water?

Answer»

Solution :HIGHER ethers are insoluble in WATER because DUE to the bigger size of the alkyl groups, the oxygenn atom in ethers fails to form INTERMOLECULAR H-bonds with water.
Discussion