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23301.

Traces of molybdenum are used with finely divided iron which acts as a catalyst during Haber's process for synthesis of ammonia . The Mo

Answer»

ACTS as a promoter to increase the activity of the catalyst
acts as a poison to decrease the activity of the catalyst
provides a NEW pathway to the reaction
forms another intermediate compound with lesser activation energy .

Solution :SUBSTANCES which themselves are not catalysts but when mixed in SMALL quantities with the catalysts increase their efficiency are called promoters or ACTIVATORS.
Discussion
23302.

Whichof the followingis true forreversible adiabaticprocess involvingan idealgas ?

Answer»

Gaswith higher`GAMMA` hashigh magnitude of SLOPE in a`P ("y-AXIS" )v//s T ("X - axis" )` curve
Gaswith higher`gamma` hashigh magnitude of slope in a`V ("y-axis" )v//s T ("x - axis" )` curve
Gaswith higher`gamma` hashigh magnitude of slope in a`P ("y-axis" )v//s V("x - axis" )` curve
Gaswith higher`gamma` haslow magnitude of slope in a`P ("y-axis" )v//s T ("x - axis" )` curve

Solution :ForP-T graph
Magneticof slope `= (gamma)/(rho-1)/(P)/(T)`
`as gammauarr"slpoe"darr`
ForP- V graph
Magnitude of slope =` (V)/(T)(1)/( gamma-1)`
` as gamma uarr slope darr`
Discussion
23303.

Which is the salt of an organic acid

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Gluber's salt
Microcosmic salt
Mohr's salt
Rochelle salt

Answer :D
Discussion
23304.

Write the IUPAC name of [Co(en)_(2)(NH_(3))_(2)]Cl_(3).

Answer»

SOLUTION :Diamminebis(ethane-1, 2-diamine)COBALT(III) CHLORIDE.
Discussion
23305.

Which of the following cannot reduce Fehling solution ?

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HCOOH
HCHO
`CH_(3)CHO`
`CH_(3)COOH`

ANSWER :C
Discussion
23306.

Which of the following does not react with water even under red hot condition ?

Answer»

Na
Be
Ca
K

Answer :D
Discussion
23307.

Write the balanced chemical equation for the reaction showing catalytic oxidation of NH_3 by atmospheric oxygen.

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Solution :`4NH_3 + 5O_2 UNDERSET(500K, 9 " bar ") OVERSET(" Pt / Rh gauze, catalyst")to 4NO + 6H_2O`
Discussion
23308.

Which of the following is broad spectrum bactrericidal antibiotics?

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Olfaxacin
Chloramphecnicol
penicillin
Tetracyclines

ANSWER :A
Discussion
23309.

Which sulphide is not precipitated in acid solution?

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CuS
SnS
PbS
ZnS

Answer :D
Discussion
23310.

Which is not a Lewis acid?

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`Sn Cl_2`
`MG Cl_3`
`"CCl"_4`
`RMG X`

Answer :C
Discussion
23311.

Which of the following is not a lewis acid?

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`BF_3`
`AlCL_3`
HCl
`LiAlH_4`

SOLUTION :It is a nucleophile and CAPABLE of DONATING electronpair and so it can as LEWIS base.
Discussion
23312.

Which of the following statements is true for a cell, Pt | H_(2 (g))| H^(+)|| Cu^(2+) | Cu ?

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Reduction occurs at `H_(2)` ELECTRODE
`H_(2)` is CATHODE and Cu is anode
`H_(2)` is anode and `Cu` is cathode
OXIDATION occurs at Cu electrode

SOLUTION :`H_(2)` is anode and Cu is cathode .
Discussion
23313.

Which one of the following on reduction with lithium aluminium hydride yields a secondary amine ?

Answer»

Methylisocyanide
Acetamide
Methyl cyanide
Nitroethane.

Solution :Methylisocyanide on REDUCTION with `LiAlH_(4)` gives dimethylamine, which is a secondary AMINE.
Discussion
23314.

The solubility of silver bromide in hypo solution is due to the formation of :

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`Ag_2SO_3`
`Ag_2S_2O_3`
`[AG(S_20_3)R`
`[Ag(S_2O_3)_2]^(3-)`

ANSWER :D
Discussion
23315.

Which of the following is an example of ''irreversible denaturation'' of a protein ?

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BOILING egg
change of AMINO acid
enzymatic action
its SYNTHESIS 

ANSWER :A
Discussion
23316.

Which one of the following elements has not been observed to form any compounds ?

Answer»

He
Ne
Ar
All of the above

Answer :D
Discussion
23317.

Which one of the following laws explains the formation of carbon monoxide and carbon dioxide from carbon and oxygon ?

Answer»

Law of conservation of mass
Law of multiple proportions
Law of reciprocal proportions
Law of difinite proportions

Solution :Law of multiple proportions explains the FORMATION of CO and `CO_(2)`, in these same weight of carbon that COMBINES with WEIGHTS of OXYGEN are in simple rate of 1 : 2.
Discussion
23318.

What mode of radioactive decay is most likely for the isotope ._(11)^(20)Na?

Answer»

Alpha
Beta
Gamma
ELECTRON CAPTURE

ANSWER :D
Discussion
23319.

Which of the following amine gives a characteristic offensive odour of isocyanide when heated with chloroform and caustic potash ?

Answer»

`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`(C_(6)H_(5))_(2)NH.`

ANSWER :A
Discussion
23320.

Which one of the following has the largest bond angle ?

Answer»

`NH_3`
`CO_2`
`H_2O`
`SO_3`

ANSWER :B
Discussion
23321.

Which of the following displacement occur:

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`Zn+2H^(+)toZn^(2+)+H_(2)UARR`
`Fe+2Ag^(+)TOFE^(2+)+Agdarr`
`Cu+Fe^(2+)toCu^(2+)+Fedarr`
`Zn+Pb^(2+)toZn^(2+)+Pbdarr`

ANSWER :A::B::D
Discussion
23322.

Which of the following relations is correct ?

Answer»

GANGUE + FLUX = SLAG
Gangue + Slag = Flux
Slag + Flux = Gangue
All of CORRECT .

ANSWER :A
Discussion
23323.

Which of the following statements are correct regardly 17^(th) group elements

Answer»

`I^(-)` reduces `CU^(2+) ` to `Cu^(+)`
`Cl^(-)` reduces `Cu^(2+)` to `Cu^(+)`
`I_(3)^(-)`exists wheras `Cl_(3)^(-)` does not
The bond energy order is `Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`

Solution :Due to the low reduction POTENTIAL of `I_(2)`, i.e. `(E_(I_(1)//I^(-))^(@))` , hence `I^(-)` is a good reducing agent and is capable of reducing, `Cu^(2+)` to `Cu^(+)` in `I_(3)^(-)` , there is strong vander Waal's forces of ATTRACTION between `I_(2)` and `I^(-)` due to large size, wheras there is weak vander waal's forces of attraction between `Cl_(2)` and `Cl^(-)` , hence `I_(3)^(-)` exists wheras `Cl_(3)^(-)` does not. In `Cl_(2)`, apart from the Cl-Cl covalent bond, there is `p pi to dpi` coordinate covalent bond between filled p-orbitals of one chlorine atom with empty d-orbitals. ASLO due to small size of F atom, the interatomic repulsion is so high that the F-F bond is weaker than the Br-Br bond. in `I_(2)` due to large size of I atom, the I- bond is very weak .
Choice (b) is incorrect because the `E_(Cl_(2)//Cl^(-))^(@)` is so high that it cannot be oxidised to `Cl_(2)` easily which only strong oxidising agents can do, `Cu^(2+)` is not a strong oxidising agent or `E_(Cl_(2)//Cl^(-))^(@) gt E_(Cu^(2+)//Cu^(+))^(@)`.
Discussion
23324.

Which of the following metal cannot liberate hydrogen from the acid ?

Answer»

copper
zinc
magnesium
nickel

Solution :As Cu lies above `H_(2)` in emf SERIES.
Discussion
23325.

What is meant by the term "Chromatography" ?

Answer»

Solution :The term chromatography is derived from the Greek WORD "Chroma" MEANS colour and "graphy" means writing because the method was first used for seperation of plant PIGMENTS into individual COMPONENTS.
Chromatography is BASED on principle of adsorption. The different components of the mixture get adsorbed differently on the adsorbent. Theadsorbed components are removed by suitable solvent known as Eluent.
Discussion
23326.

Which of the following statement(s) is (are) correct when a mixture of NaCl and K,Cr, is gently warmed with conc. H_2SO_4?

Answer»

 A deep red VAPOUR is EVOLVED 
The vapours when passed into NAOH solution gives a yellow solution of `Na_2CrO_4`
 Chlorine gas is evolved 
Chromyl chloride is formed

Answer :A::B::D
Discussion
23327.

When SO_2 is passed through acidified solution of H_2S :

Answer»

`H_2SO_3` is FORMED
`H_2SO_4` is formed
Sulphur SOL is formed
`H_2SO_5` is formed

Answer :C
Discussion
23328.

Zinc is used but not copper for the recovery for metallic silver from the complex [Ag(CN)2]^-, although electrode potentials of both zinc and copper are less than that of Ag. Explain why ?

Answer»


Answer :Zinc reacts at FASTER RATE as COMPARED with copper, further zinc is CHEAPER than copper.
Discussion
23329.

Using the given data calculate enthalpy of formation of acetone (g). [All value in "KJ mol"^(-1)] bond enthalpy of : {:(C-H=413.4,,,C-C=347.0,,,(C=O)=728.0,,),((O=O)=495.0,,,H-H=435.8,,,Delta_("sub")H" of "C=718.4.,):}

Answer»


Solution :`3C+3H_(2)+1/2 O_(2) rarr CH_(3) -underset(O)underset("||")(C)-CH_(3)`
Calculate `DeltaH`
`DeltaH=-192.3" kJ MOL"^(-1)`
Discussion
23330.

Which letter indicates where a thermometer should be placed to determine the boiling point of a distillate?

Answer»

A
B
C
D

ANSWER :D
Discussion
23331.

When 1-pentyne ( A) is treated with 4N alcoholic KOH at 175^(@)C , it is converted into an equilibrium mixture of 1.3% 1-pentyne ( A), 95.2% 2- pentyne ( B ) and 3.5% of 1,2-pentadiene (C ) . The equilibrium is maintained at 175^(@)C. Calculate Delta G_(2)^(@) for the following equlibria. B rarr C "........" Delta G_(2)^(@)

Answer»


ANSWER :`0012`
Discussion
23332.

[Y is used infire works, safety matches] Euochlorine is a mixture of

Answer»

`Cl_(2)` and `SO_(2)`
`Cl_(2)` and `ClO_(2)`
`Cl_(2)` and `CO_(2)`
none

Solution :`underset("(X)")(3Cl_(2)) + 6KOH OVERSET(hot)(rarr) 5KCl + underset("(Y)")(KClO_(3)) + 3H_(2)O , KClO_(3) overset("(Y)")(+)con. HCl rarr`
Discussion
23333.

Which is pain relieving drug ?

Answer»

Antipyretic
Analgesic
Antibiotic
Antiseptic.

Answer :B
Discussion
23334.

Which of the following compounds haslowestboiling point ?

Answer»

b-butyl ALCOHOL
ISOBUTYL alcohol
tert-butyl alcohol
sec-butyl alcohol

ANSWER :C
Discussion
23335.

Which of the following reactions can be kinetically studied under nomal laboratory conditions ?

Answer»

`NaOH+HCl to NaCl + H_2O`
`AgNO_3 +HCl to KNO_3 + AgCl`
`2N_2O_5 to 4NO_2 + O_2`
all of the above

Solution :Thermal DECOMPOSITION of `N_(2)O_(5)` is a molecular reaction and proceeds at a measurable rate . REACTIONS between NaOH and HCl and `AG^(+)` and `CL^(-)` are very FAST reactions .
Discussion
23336.

What happens when ammonia reacts with chlorine?

Answer»

SOLUTION :
Discussion
23337.

Which is the stronger acid in the following pair? CH_(3)-CH_(2)-COOH and NC-CH_(2)-COOH

Answer»

SOLUTION :`NC-CH_(2)-COOH` is the stronger ACID than `CH_(3)-CH_(2)-COOH`.
Discussion
23338.

Write the general formula of Grignard reagent

Answer»

SOLUTION :GENERAL FORMULA of GRIGNARD REAGENT is `R-Mg-X`.
Discussion
23339.

When 0.01 mole of sugar is dissolved in 100g of a solvent, the glucose is dissolved in 50 g of the same solvent, the depression in freezing point will be

Answer»

`0.60^(@)`
`0.80^(@)`
`1.60^(@)`
`2.40^(@)`

Solution :`DELTA T_(F)=mk_(f)`
`0.40=(0.01xx1000)/(100)xx k_(f)rArr k_(f)=4`
again `Delta T_(f)=mk_(f)`
`=(0.03xx1000)/(50)xx4=2.4`
Discussion
23340.

Which of the following does not characterise X-rays?

Answer»

The radiation can ionise gases
It casuses ZnS to fluorescence
DEFLECTED by ELECTRIC and magnetic field
Have wavelengths shortest than ULTRAVIOLET rays

Solution :X-rays do not CARRY any CHARGE and hence are not deflected by electric and magnetic fields
Discussion
23341.

Which non-metal does not combine directly with Cl_2, Br_2 and I_2

Answer»

Carbon
Nitrogen
Oxygen
All

Answer :D
Discussion
23342.

When H- CHO reacts with NH_(3),urotrophin is formed. In this molecule how many C -C bonds are present ?

Answer»

4
2
0
6

Solution :STRUCTURE of UROTROPINE is ,
Discussion
23343.

Whichof theisomershexanegivesfivemonochloro derivativeswhenchorinated ?

Answer»

Solution : Hexane `(C_(6) H_(14))`has FIVE structuralisomers .

out of these struture (iii) and(iv) areoptically active structure (i) gives three ISOMERS, structure(iii)givestwoisomers,(iv)giversthreeand (v)gives threeisomers ,
Discussion
23344.

Which of the following is a nucleophilic substitution reaction ?

Answer»

`HNO_(3)`
HI
`SO_(2)`
`H_(2)O`

ANSWER :A
Discussion
23345.

Which of the following is an example of elimination reaction :

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CHLORINATION of `CH_4`
DEHYDRATION of `C_2H_5OH`
NITRATION of benzene
Hydroxylation of `C_2H_4`

ANSWER :B
Discussion
23346.

Write the IUPAC names of the follow coordination compounds. [Pt(NH_(3))_(2)Cl(NO_(2))]

Answer»

SOLUTION :Diamminechloridonitrito-N-platinum(II)
Discussion
23347.

Whatmakes lemon sour

Answer»

citric ACID
ACETIC acid
tartaric acid
OXALIC acid

ANSWER :A
Discussion
23348.

Which of the following has highest ionisation energy:

Answer»

CU
Ag
Au
All have same IONISATION ENERGY

ANSWER :C
Discussion
23349.

Which of the following sulphides are soluble only in aqua regain ?

Answer»

`NiS`
`CoS`
`HGS`
`CDS`

Solution :These are SOLUBLE in aqua REGIA only
Discussion
23350.

underset(aq.)(3HCHO) overset("cooled")hArr X.X is

Answer»

Formalin
Paraformaldehyde
Paraldehyde
Metaformaldehyde

Answer :D
Discussion