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19301.

Total number of geometrical isomers for the complex [RhCl(CO)(PPh_(3))(NH_(3))] is

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SOLUTION :`[RhCl(CO)(PPh_(3))(NH_(3))]` is a square planar complex with four different ligands (MABCD type). Hence, it has three geometrical isomers as FOLLOWS :
Discussion
19302.

Which of the following compounds exists ?

Answer»

`KHCl_(2)`
`KHF_(2)`
`KHBr_(2)`
`KHI_(2)`

SOLUTION :`K^(+)[F......H-F]^(-)`. DUE to H-between HF and `F^(-), KHF_(2)` exists.
Discussion
19303.

What happens if fluorides are present in water?

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ANSWER :40 PPM
Discussion
19304.

Which of the following alkene is most stable ?

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`CH_(3)-CH_(2)-CH=CH_(2)`
`CH_(3)-CH-CH=CH_(3)`

ANSWER :D
Discussion
19305.

When KMnO_(4) solution is added to hot oxalic acid solution, the decolorisation is slow in the beginning but becomes instantaneous after some time. This is because:

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`Mn^(2+)` acts as auto catalyst
`CO_(2)` is formed
Reaction is exothermic
`MnO_(4)^(-)` catalyst the reaction

Answer :A
Discussion
19306.

Which statement(s) is/are wrong?

Answer»

a.Path I is Claisen-Schmidt rearrangement reaction, WHEREAS Path II is Hofmann bromamide rearrangement reaction.
b.Both path proceeds via the formation of acyl nitrene as an intermediate species `(R-OVERSET(O)overset(||)(C )-overset(..)(N): ).`
c.In path I and Path II, the intermediate compound FORMED is alkyl isocynaye `(R-N=C=O)`
d.Both the path proceed via the formation of nitrene `(R-overset(..)(N): )` as a intermediate species.

Solution :Statement `(a), (b)`, and `(c )` are CORRECT, but statement `(d)` is wrong. Hence, the answer is `(d)`.
Discussion
19307.

Which of the following has high resonance energy than

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ANSWER :A
Discussion
19308.

Which of the following reagents can form a hydrazone with alkanone ?

Answer»

`NH_(2)OH`
`PhNHNH_(2)`
`NH_(2)NHCONH_(2)`
HCN

Answer :B
Discussion
19309.

Washing sodal is

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`Na_(2)CO_(3).10H_(2)O`
`Na_2CO_(3).H_(2)O`
`Na_(2)CO_(3).5H_(2)O`
`Na_(2)CO_(3)`

Answer :A
Discussion
19310.

Tributyrin is a fat present in butter . It is formed by combination of butyric acid with :

Answer»

Glycerol
Oleic ACID
STEARIC acid
Chloroform

Answer :A
Discussion
19311.

Which solution will show the highest resistance during the passage of current ?

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0.05 N NACL
2N NaCl
0.1 N NaCl
1 N NaCl

ANSWER :B
Discussion
19312.

Which of the following pairs of nucleides are isodiaphers ?

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`""_(13)^(6)C` and `""_(8)^(16)O`
`""_(1)^(1) H` and`""_(1)^(2)H`
`""_(1)^(3)H` and `""_(2)^(4)H`
`""^(25)_(55)Mn` and `""_(30)^(65)ZN`

Solution :Isodiaphers have same differenceof NUMBEROF neutronsand protons or (A-2Z) must be same .
Discussion
19313.

What are the limitation of VB theory ?

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Solution :Limitations of VB -THEORY :
`1`. It does not explain the colour of the complex.
`2`. It considers only the SPIN only magnetic MOMENTS and does not consider the other components of magnetic moments.
`3`. It does not provide a quantitative explanation as to why certain complexes are inner orbital complexes and the others are outer orbital complexes for the same metal. For example, `[Fe(CN)_(6)]^(4-)` is diamagnetic (low spin) whereas `[FeF_(6)]^(4-)` is paramagnetic (high spin).
Discussion
19314.

Which one of the following constitues irreversible colloidal system with water as dispersion medium ?

Answer»

CLAY 
PLATINUM 
`Fe (OH)_3`
All of THREE 

Answer :D
Discussion
19315.

The type of isomerism observed in urea molecule is:

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CHAIN
position
tautomerism
None of these

Answer :C
Discussion
19316.

What are biocatalyst ?

Answer»

Hormones
ENZYMES 
ACTIVE SITE 
All of the GIVEN 

SOLUTION :Enzymes
Discussion
19317.

The solubility product of salt AB_2 is 4xx10^(-9) at 373K . The solubility of AB_2 in boiling water will be :

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`4xx10^(-3)` M
`4XX 10^(-4)` M
`1XX10^(-10)` M
`1 XX 10^(-3)` M

Answer :D
Discussion
19318.

Which of the following electronic configurations in the outermost two subshells is characteristic of the alkali metals ?

Answer»

`(n-1)s^(2)p^(6)NS^(2)`
`(n-1)s^(2)p^(6)d^(10)ns^(1)`
`(n-1)s^(2)p^(6)ns^(2)np^(1)`
`(n-1)s^(2)p^(6)ns^(1)`

Solution :Alkali metals have one ELECTRON in the OUTERMOST s-subshell.
Discussion
19319.

Which is not a mineral acid :

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`HNO_3`
`HCL`
`C_6H_8O_7`
`H_2SO_4`

ANSWER :C
Discussion
19320.

Which of the following treatment will convert starch directly into glucose ?

Answer»

Heating with DILUTE `H_(2)SO_(4)`
Fermentation by DIASTASE
Fermentation by zymase
Heating with dilute NaOH

Answer :A
Discussion
19321.

The total numbe of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is

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SOLUTION :
Discussion
19322.

Which of the following is least reactive towards nucleophilic displacement reaction when treated with aqueous KOH ?

Answer»

2,4,6 -Trinitrochlorobenzene
2,4-Dinitrochlorobenzene
4-NITROCHLOROBENZENE
3- Nitrochlorobenzene

ANSWER :D
Discussion
19323.

Which of the following is not an oxidation product of an alkane?

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Alcohol
Aldehyde
Carboxylic acid
Ether

Solution :`RCH_(3) OVERSET([O])(to) RCH_(2) OH overset([O])(to) RCHO overset([O])(to) RCOOH`
Ethers are not the oxidation products of ALKANES.
Discussion
19324.

Which of the following statements reagarding interhalogen compound is a gas at 298K?

Answer»

`ICI`
`IBR`
`BrF_5`
`CIF`

ANSWER :D
Discussion
19325.

Which one of the following compounds gives methane on treatment with water

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`Al_4C_3`
`CaC_2`
`VC`
`SiC`

SOLUTION :`Al_4C_3 + 12H_2O to 3CH_4 + 4AL(OH)_3`
`CaC_2+2H_2O to C_2H_2 +CA(OH)_2`
Discussion
19326.

Which of the following metals is leached by cyanide process a

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Al
Na
AG
Mg

Solution :Ag, AU, Alores are CONCENTRATED by LEACHING PROCESS.
Discussion
19327.

Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 mole of X and 3 mole of Y is 550 mm Hg. At the same temperature, if 1 mole of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure ( in mm Hg) of X and Y in their pure states will be, respectively :

Answer»

<P>200and 300
300 and 400
400 and 600
500 and 300

Solution :According to Raoult.s law
`p=p_(X)^(@)x_(X)+p_(Y)^(@)x_(Y)`
Initially, `p=550` mm Hg, `x_(X)=1/4, x_(Y)=3/4`
`550=p_(X)^(@)*1/4+p_(Y)^(@)*3/4` ...(i)
On adding 1 MOLE of Y
`p=560` mm Hg, `x_(X)=1/5, x_(Y)=4/5`
`560=p_(X)^(@)*1/5+p_(Y)^(@)*4/5`...(ii)
Solving eq. (i) and (ii), `p_(X)^(@)=400` mm Hg
`p_(Y)^(@)=600` mm Hg.
Discussion
19328.

Thevapourpressurewill belowest for _______.

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0.1 M sugar solution
0.1 M KCL solution
`0.1 M Cu(NO_(3))_(2)` solution
`0.1 M AgNO_(3)` solution

Solution :Vapour pressire of a solvent is lowered by the presence of SOLUTE in it. Lowering in vapour pressure is a COLLIGATIVE property i.e., it depends on the no. of particles present in the solution. `Cu(NO_(3))_(2)` give the maximum no. of ions. (i.e., 3) so it causes the greatest lowering in vapour pressure of water.
Discussion
19329.

Write the structure of the following H_2S_2O_7

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SOLUTION :
Discussion
19330.

The total number of tetrahedral voids in the face centred unit cell is ........

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6 
8 
10 
12 

Solution :Number of tetrahedral = 2 X number of atoms PER UNIT cell
No. of atoms per unit cell = 4.
Discussion
19331.

Which of the following compounds exists as non-resolvable recemic mixture ?

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SOLUTION :Non-resolvable vacemic MIXTURE - no CHIRAL CENTRE
Discussion
19332.

Which of the following is correct for the given compound

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It possess centre of symmetry
It possess `C_(4)` axis of symmetry
It PROSSESS plane of symmetry
Compound is chiral

Solution :same configuration reappears.
Molecular plane of summetry is present in the compound. Centre of symmetry is ABSENT because same group at the same distance does not meet.
Discussion
19333.

Which base is present in RNA and not in DNA ?

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GUANINE
Cytosine
Uracil
Thymine

Answer :C
Discussion
19334.

Which of the following is most basic in aqueous solution ?

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`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`NH_(3)`.

ANSWER :B
Discussion
19335.

Which of the following will reduce Tollens' reagent ? Explain.

Answer»

<P>

Solution :In DISACCHARIDE (Q), both the monosaccharides are linked through their reducing centres `(C_1)`, therefore , it is not a reducing disaccharide. In disaccharide (P), the reducing end `(C_1)` of one MONOSACCHARIDE is linked to NON -reducing end `(C_4)` of the other monosaccharide. In other wordsm, reducing end of one monosaccharide is free. Therefore, it is a reducing dissaccharide.
Discussion
19336.

When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the negative ions towards the anode. If the cathode is pulled out of the solution

Answer»

The positive and negative ions will move towards the anode
The positive ions will start MOVING towards the anode, the negative ions will stop moving
The negative ions will CONTINUE to move towards the anode and the positive ions will stop moving
The positive and negative ions will start moving randomly

Solution :In the absence of electric FIELD the ions in the solution move randomly due to thermal ENERGY.
Discussion
19337.

Which of the following is the function of aspirin?

Answer»

ANALGESIC
Antiseptic
Antipyretic
Both (a) and ©

Solution :The CHEMICAL SUBSTANCES which are used to RELIEVE pains are called analgesics and the chemical substances which are used to lower the TEMPERATURE of the body in high fever are called antipyretics. Aspirin acts both as analgesic and antipyretic.
Discussion
19338.

Which one of the following is main cause of lanthanoid contraction?

Answer»

Poor SHIELDING effect of 5F SUB shell
more shielding effect of 4f sub shell
Poor shielding effect of 4f sub shell
more shielding effect of 4f sub shell

Solution :Poor shielding effect of 4f sub shell
Discussion
19339.

The total number of symmetry in a cubic crystal is :

Answer»

9
23
10
None

Answer :B
Discussion
19340.

Which reagent is suitable for one step preparation of n-pentane from 2-pentanone ?

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`Zn-Hg//HCl2) LiA1H_4`
`K_2Cr_2O_7//H_2SO_4` ONE STEP CONVERSION is not POSSIBLE

ANSWER :A
Discussion
19341.

Which of the following statements is correct for CsBr_(3)?

Answer»

It is a covalentcompound.<BR>It CONTAINS `Cs^(2+)` and `Br^(-)` ions.
It contains `Cs^(+) and Br_(3)^(-)` ions
It contains `Cs^(+), and Br^(-)` and lattice `Br_(2)` molecules.

Solution :`CaBr_(3)` may be represented as `Cs^(+)Br_(3)^(-)`
Discussion
19342.

Which of the followingis a monomer of natural rubber ?

Answer»

Chloroprene
Caproplactam
Urea
none of these.

ANSWER :D
Discussion
19343.

Which of the following compound posses centre of symmetry?

Answer»




ANSWER :B
Discussion
19344.

When 3-methylpentan-3-ol is heated with alumina. The main product formed is,

Answer»

2-methylpent-1-ene
3-methylpent-2-ene
2-methylbut-2-ene
3-methylbut-2-ene

Answer :B
Discussion
19345.

Which of the following will react with NaOH to form methanol as a major product ?

Answer»

`(CH_3)_4N^(+)I^(-)`
`(CH_3)_3S^(+)I^(-)`
`(CH_3)_3C Cl`
`CH_3-O-CH_3`

Solution :`3^@R-X` will afford alkene as major PRODUCT with NaOH. Due to greater electronegativity of N over S, positive charge on N will MAKE the methyl groups more electron-deficient therefore, `(CH_3)_4N^(+)I^(-)` will UNDERGO nucleophilic substitution more READILY.
Discussion
19346.

Which of the following curves represents 1st order reaction ?

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[IMAGE]

ANSWER :B
Discussion
19347.

What idea can be obtained about the structure of monosaccharides from mutarotation?

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SOLUTION :The idea of closed-ring STRUCTURE of monosaccharides is OBTAINED from mutarotation
Discussion
19348.

What is the action of cone. HI on glucose?

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Solution :When glucose reacts with concentrated hydroiodic acid in the presence of red · PHOSPHOROUS, complete reduction takes place and n-hexane is formed as a product.
`underset("Glucose")(C_(6)H_(16)O_(6))overset(HI//P)underset("reduction")rarrCH_(3)-underset("n-hexane")(CH_(2))-CH_(2)-CH_(2)-CH_(3)`
Discussion
19349.

Which of the following compounds undergoes haloform reaction ?

Answer»

`CH_3COCH_3`
HCHO
`CH_3CH_2Br`
`CH_3-O-CH_3`

SOLUTION :The compounds which have `CH_3-overset(O)overset(||)C-" or "CH_3-overset(OH)overset(|)(CH)-` groupcan UNDERGO HALOFORM REACTIONS. Thus , acetone `(CH_3COCH_3)` undergoes haloform reaction.
Discussion
19350.

Which acts poison to platinum ( a catlyst ) in the manufacture of H_2SO_4 by contact process?

Answer»

Aresenic
`CO_2`
CO
Sodium sulphide

Answer :A
Discussion