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26551.

The O.S. of manganese in KMnO_4is +7

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ANSWER :A
Discussion
26552.

The ortho and para hydrogen possess:

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Same physical properties but DIFFERENT CHEMICAL properties
Different physical properties but same chemical properties
Same chemical and physical properties
Different physical and chemical properties

Answer :B
Discussion
26553.

The origin of acidity and basicity in organic compound is great interest and provides an extensive comparison. Among hydrocarbons % a character is taken in aC Count while to decide the acidity, in simple aliphatic acids, more the number of alkyl groups, (+1 effect) less is the acidity & more the (-1 effect) groups larger the acidity and vice-versa in the case of simple alphatic bases. Benzoic acid is more stronger than carboxylic acid as benzoate ion is stablised more by resonance. Aromatic amines are less basic than apiphatic amine as the electron pair is less available in case of aromatic amines. The presence of solvent also plays a very important role and at time governs the order too. Which of the following is most acidic

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ANSWER :B
Discussion
26554.

The origin of acidity and basicity in organic compound is great interest and provides an extensive comparison. Among hydrocarbons % a character is taken in aC Count while to decide the acidity, in simple aliphatic acids, more the number of alkyl groups, (+1 effect) less is the acidity & more the (-1 effect) groups larger the acidity and vice-versa in the case of simple alphatic bases. Benzoic acid is more stronger than carboxylic acid as benzoate ion is stablised more by resonance. Aromatic amines are less basic than apiphatic amine as the electron pair is less available in case of aromatic amines. The presence of solvent also plays a very important role and at time governs the order too. Which of the following orders regarding acid strength is correct ?

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`HCOOHltCH_(3)COOHltPhCOOH`
`HCOOHgtPhCOOHgtCH_(3)COOH`
`HCOOHgtCH_(3)COOHgtPhCOOH`
`CH_(3)COOHgtHCOOHgtPhCOOH`

ANSWER :B
Discussion
26555.

The origin of charge on colloidal solution is :

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Self dissociation (in soaps and DETERGENTS)
Electron capture during Bredig's arc METHOD
Selective ADSORPTION of ion on their surface
It is DUE to addition of protective colloids

Answer :A::B::C
Discussion
26556.

The number of rings present in the structure of chlorophyll is

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SOLUTION :There are 9 rings PRESENT in CHLOROPHYLL as SHOWN in the next column
Discussion
26557.

The origin of change on colloidal solution is

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Frictional rubbing
Electron capture during BREDIG's arc method
selective adsorption of IRON on their surfaces
It is due to addition of protective colloids

SOLUTION :(A),(B) and ( C) are the METHODS for origin of charge on colloidal solution.
Discussion
26558.

The number of resonance structures of nitrobenzene is

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SOLUTION :
Discussion
26559.

The number of resonance structure of aniline is

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SOLUTION :
Discussion
26560.

The orgnaic chloro compound, which shows complete stereochemical inversion during a S_(N^(2)) reaction, is

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`(CH_(3))_(3)C CL`
`(CH_(3))_(2)CHCl`
`CH_(3)Cl`
`(C_(2)H_(5))_(2)CHCl`

Answer :C
Discussion
26561.

The organochlorocompound which shows complete steriochemical inversion during the S_(N^(2)) reaction is:

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`CH_(3)Cl`
`C_(2)H_(5)Cl`
`(CH_(3))_(3)C Cl`
`(CH_(3))_(2)CHCl`

SOLUTION :`CH_(3)Cl` (PRIMARY ALKYL chloride) shows maximum stereochemical INVERSION because of the least CROWDING by only alkyl `(CH_(3))` group.
Discussion
26562.

The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is

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Solution : At 500-800 K (lower TEMPERATURERANGE in the blast furnance)
`3Fe_(2)O_(3) + CO to 2Fe_(3)O_(4)+CO_(2)`
`Fe_(2)O_(4) + CO to 3Fe_(3)+4CO_(2)`
`Fe_(2)O_(3) + CO to 2FeO+CO_(2)`
At 900-1500K ( HIGHER temperature range in the blast funcance)
`CF+CO_(2) to 2CO. FeO+CO to Fe +CO_(2)`
Discussion
26563.

The orientation of an atomic orbital is governed by

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SPIN QUANTUM number
magnetic quantum number
principal quantum number
Azimuthal quantum number

Answer :B
Discussion
26564.

The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is .

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Solution :At 500-800 K (LOWER TEMPERATURE range in the blast FURNACE)
`3Fe_2O_3+COto2Fe_3O_4+CO_2`
`Fe_3O_4+CO to 3FE+ 4 CO_2`
`Fe_2O_3 + CO to 2FeO+ CO_2`
At 900-1500 K (higher temperature range in the blast furnace):
`C+CO_2 to 2CO, FeO+CO to Fe+CO_2`
Discussion
26565.

The organo bromo compound which shows complete stereochemical inversion during a S_(N)2 reaction is ________.

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`CH_(3)Br`
`(C_(2)H_(5))_(2)CHBr`
`(CH_(3))_(3)CBR`
`(CH_(3))_(2)CHBr`

Answer :A
Discussion
26566.

The organisms susceptible to the inhibitory effect of an antibiotic are known as_______.

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 receptors
spectrum
 target
substrate
Discussion
26567.

The number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called?

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SOLUTION :MOLECULARITY
Discussion
26568.

The organic product of which reaction from the followings used as anaesthetic ?

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Chloral `+ Ca(OH)_(2)to`
`CHCl_(3)overset(H_(2)//Ni)rarr`
Chloral + Chlorobenzene `to`
`Cs_(2)+3Cl_(2)overset((ANH. AlCl_(3)))rarr`

Solution :Chloral `+Ca(OH)_(2)to CHCl_(3)+Ca(HCOO)_(2)`
Discussion
26569.

The organic liquid that mixes freely with water is :

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`CHCI_3`
`C_2H_5OH`
`C_6H_6`
`CS_2`

ANSWER :B
Discussion
26570.

The number of reactions that gives SO_(2) gas : (a) Cu+"conc. "H_(2)SO_(4)rarr (b) Zn +"dil. "H_(2)SO_(4)rarr (c ) S+H_(2)SO_(4)rarrr (d) FeS_(2)+O_(2)rarr (e ) NaHSO_(3)+"dil. "H_(2)SO_(4)rarr (f) H_(2)SO_(4)+PCl_(5)rarr

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ANSWER :4
Discussion
26571.

The number of radioactive isotopes of hydrogenis:

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1
2
3
None of these

Answer :A
Discussion
26572.

The organic detergent that is used in hair conditioners is:

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Sodium dodecylbenzene sulphonate
Sodium laury SULPHATE
Tetramethyl ammonium chloride
Cetyltrimethyl ammoniulm bromide

ANSWER :D
Discussion
26573.

The number of racemic mixture obtained by optical isomers of 2, 3-dihydroxy butanal is/are

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Three
Two
One
Zero

Solution :`{:(CH_(3)-overset(**)(C)H-overset(**)(C)H-CHO),("|""|"),(""OH" "OH):}`
Number of stereoisomers `= 2^(n) = 4`.
Here 2 RACEMIC mixtures are obtained.
Discussion
26574.

The organic liquid that mix freely with water is:

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`CHCl_3`
`C Cl_4`
`CS_2`
`C_2H_5OH`

ANSWER :D
Discussion
26575.

The number of quanta of radiations of frequency 4.75xx10^(13)s^(-1) required to melt100g of ice is (energy required to melt 1 g of ice is 350J)

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`1.113xx10^(23)`
`111.3xx10^(23)`
`11.13xx10^(23)`
`1.113xx10^(22)`

SOLUTION :Energy of a QUANTUM
`=6.63xx10^(-34)Jsxx4.75xx10^(13)s^(-1)`
`=3.15xx10^(-20)J`
Energy required `=100xx350=3.50xx10^(4)`
NO.of quanta `=(3.50xx10^(4))/(3.15xx10^(-20))`
`=11.13xx10^(23)`
Discussion
26576.

The organic detergents that is used in hair conditioners ______________.

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SODIUM dodecyl BENZENE sulphonate
Sodium lauryl SULPHATE
sodium stearyl sulphate
cetylrimethylammonium CHLORIDE

ANSWER :D
Discussion
26577.

The number of radial nodes and nodal planes in 2p orbital are

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1,1
2,1
2,2
0,1

Answer :A
Discussion
26578.

The organic detergent that is used in hair conditioners is

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SODIUM DODECYLBENZENE sulfonate
sodium lauryl sulphate
tetramethylammonium chloride
cetyltrimethylammonium bromide

Answer :D
Discussion
26579.

The number of protons, electrons and neutrons respectively in a molecule of heavy water is:

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10, 10, 10
8, 10, 11
10, 11, 10
11, 10, 10

Answer :A
Discussion
26580.

The number of primary secondary, tertiary and quaternary carbons in neopentane are respectively.

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4,3,2 and 1
5,0,0 and 1
4,0,0 and 1
4,0,1 and 1

ANSWER :C
Discussion
26581.

The number of primary and secondary hydroxyl groups in ribose are :

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1, 3
2, 3
3, 1
3, 2

Answer :A
Discussion
26582.

The number of primary, secondary and tertiary amine isomers possible for the compound with formula C_(4)H_(11)N are

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4, 3, 1
4, 3, 2
3, 2, 1
4, 2, 1

Answer :A
Discussion
26583.

The number of primary amines of formula C_4H_11N is :

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1
3
4
2

Solution :`1^@`amines have -`NH_2` group in their structure 4 primary amines are possible by `C_4H_11N`.
`underset"(i)"(CH_3-CH_2-CH_2-CH_2NH_2)`
`underset"(II)"(CH_3-CH_2-undersetunderset(NH_2)|CH-CH_3)`
`underset"(iii)"(CH_3-undersetundersetH|overset(CH_3)overset|C-CH_2-NH_2)`
`underset"(IV)"(CH_3-undersetunderset(NH_2)|oversetoverset(CH_3)|C-CH_3`
Discussion
26584.

The organic compounds of high physiological importance which are essential in small amounts for the well being of all human beings are:

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Proteins
Vitamins
Mineral salts
Enzymes

Answer :B
Discussion
26585.

The number of primary alcoholic groups in ethylene glycol is _______

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0
1
2
3

Answer :C
Discussion
26586.

The organic compound whose boiling point is 452 K and has the smell of bitter almond is _______.

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HCHO
`CH_(3)CHO`
`C_(6)H_(5)CHO`
`C_(6)H_(5)CH_(2)CHO`

Answer :C
Discussion
26587.

The organic compound which evoporates easily on exposure to atmospheric air

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`C_2H_5OC_2H_5`
`CHCl_3`
`CH_3CH_2OH`
`CH_3CHO`

ANSWER :A
Discussion
26588.

The organic compounds A and B react with sodium metal and release H_2 gas. A and B react together to give ethyl acetate. Then A and B are

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`HCOOH and C_2H_5OH`
` C_2H_5OH and CH_3COOH`
` CH_3COOH and CH_3OH`
` CH_3COOH and HCOOH`

ANSWER :B
Discussion
26589.

The number of possible three dimensional lattices are :

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7
14
6
8

Answer :B
Discussion
26590.

The organic compounds A and B react with sodium metal and release H_2 gas . A and B react with each other to give ethyl acetate. The A and B are.

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`CH_3COOH` and `C_2H_5OH`
HCOOH and `C_2H_5OH`
`CH_3COOH` and`CH_3OH`
`CH_3COOH` and HCOOH

Answer :A
Discussion
26591.

The number ofppi - d pi bonds bonds in H_(3)PO_4What is the value of X ?

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SOLUTION :
Discussion
26592.

The organic compounds A and B react with sodium metal and release H_2 A and B react together to give ethyl acetate. They are

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`HCOOH and C_2H_5OH`
`C_2H_5OH and CH_3 COOH`
`CH_3 COOH and CH_3 OH`
`CH_3 COOH and HCOOH`

ANSWER :B
Discussion
26593.

The number of precipitable halide ions in[Pt(NH_3)Cl_2Br]Cl is :

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2
3
4
1

Answer :D
Discussion
26594.

The number of possible organobromine compounds which can be obtained in the allylic bromination of 1-butene with N-bromosuccinimide is

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1
2
3
4

Solution :NBS (N-Bromosuccinimide) does ALLYLIC bromination through free radical SUBSTITUTION.

`:.` TOTAL 4 isomers are POSSIBLE.
Discussion
26595.

The organic compound which does not give blue colour in Lassaigne's test is:

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Anilline
Glycine
Hydrazine
Urea

Answer :C
Discussion
26596.

The number of structural and configurational isomers of a bromo compound, C_5H_9Br, formed by the addition of HBr to 2-pentyne respectively, is:

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

Answer :B
Discussion
26597.

The organic compound that transfer biological information from one group of cells to distant tissues or organs are called as

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Vitamins
Proteins
Hormones
Carbohydrates

Answer :C
Discussion
26598.

The organic compound present in tincture of iodine is :

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ALCOHOL
`CCI_4`
ACETONE
`CS_2`

ANSWER :A
Discussion
26599.

The organic compound A on reaction with Na_(2)Cr_(2)O_(7)// H_(2)SO_(4) gives B. This Bon reduction in presence of Ni gives ethyl alcohol. What is A ?

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ETHANOIC acid
Ethene
Ethanal
Ethanol

Solution :
Discussion
26600.

Write all possible isomers with the molecular formula C_(4)H_(10)O and name them.

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FOUR
six
seven
eight

Answer :C
Discussion