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18951.

Which of the following is not an essential amino acid ?

Answer»

Valine
Phenylalanine
Serine
Leucine.

Answer :C
Discussion
18952.

Which of the following series of compounds have same mass percentage of carbon ?

Answer»

`CO_(2)`,CO
`CH_(4),C_(2)H_(6),C_(2)H_(2)`
`C_(2)H_(2),C_(6)H_(6),C_(10)H_(6)`
`HCHO,CH_(3)COOH,C_(6)H_(12)O_(6)`

Answer :D
Discussion
18953.

Why carbohydrates acts as a biofuel ?

Answer»

Solution :This is because on oxidation or COMBUSTION with OXYGEN, they PRODUCE energy.
Discussion
18954.

Which method is useful for the synthesis of ether?

Answer»


`C_(2)H_(5)ONA+(CH_(3))_(2)SO_(4)rarr`

`(CH_(3))_(3)CBr+CH_(3)CH_(2)ON ato`

Solution :`-` Ether is `R-O-R`
`-` `3^(@)` alkyl HALIDE give alkenes on Rxn with BASE
Discussion
18955.

Which element is purified by zone refining ?

Answer»

Ge
Si
Si & Ge
None

Answer :B
Discussion
18956.

Which of the following statements is/are true?

Answer»

In ferrocyanide ion, the EFFECTIVE atomic number is 36
Chelating ligands are ATLEAST bidentate ligands
`[CrCl_(2)(CN)_(2)(NH_(3))_(2)]^(2+)" and "[CrCl_(3)(NH_(3))_(3)]` both have `d^(2)sp^(3)` hybridisation
As the number of rings in complex increases, stability of complex (CHELATE) also increases

Solution :`(Mn_(2)(CO)_(10))` total electrons `=25xx2+10xx2=70`

Hence `Mn_(2)(CO)_(10)` is neither an O.A. or R.A.
Discussion
18957.

Why are aqueous solutions of amines basic in nature ?

Answer»


ANSWER :`""R-NH_(2)+H_(2)O RARR R-overset(+)(N)H_(3)+OH^(-)`
Formation of `OH^(-)` INDICATES that it is basic in nature.
Discussion
18958.

The salt used for performing 'bead' test in qualitative inorganic analysis is

Answer»

`K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
`FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O`
`Na(NH_(4))HPO.4H_(2)O`
`CaSO_(4)2H_(2)O`

SOLUTION :`underset("Micro cosmic salt")(Na(NH_(4))HPO_(4)) overset(Delta)to underset("Sodium meta phosphate (TRANSPARENT)")(NaPO_(3))+NH_(3)+H_(2)O`
Discussion
18959.

Which of the following radicals will be precipitated by passing H_(2)S through a conc. HCI solution?

Answer»

Cu
SB
Cd
As

Solution :IIND GROUP cations `Cu^(+2), Sb^(+3), As^(+3)`
Discussion
18960.

Write IUPAC name for [Ag(NH_(3))_(2)]NO_(3).

Answer»

SOLUTION :Diamminesilver(I) NITRATE
Discussion
18961.

Which decomposes on heating ?

Answer»

`K_2CO_3`
`Rb_2CO_3`
`Na_2CO_3`
`MgCO_3`

ANSWER :D
Discussion
18962.

What is the

Answer»


The SOLUBILITY product of hydroxides of cations of group III is extremely low.
`NH_(4)Cl` suppressess the ionisation of `NH_(4)OH` to a GREAT extent due to common ion EFFECT. As a result low concentration of `OH^(ɵ)` is made AVAILABLE for precipitating group III cation hydroxides.

Solution :Why do we ADD excess of `NH_(4)Cl` and `NH_(4)OH` in the precipitation of group III cations.?
Discussion
18963.

Us the data of Q.8 and find out ht emost stable oxidised species.

Answer»

`Cr^(3+)`
`MnO_(4)^(-)`
`Cr_(2)O_(7)^(2-)`
`Mn^(2+)`

Solution :The velue of `E^(Theta)Cr^(3+)//Cr` is -0.74 V, which is minimum value AMONG given FOUR.
reduction :`Cr^(3+)+3e^(-)toCr`
Oxidation :`Crto Cr^(3+)+3e^(-)`
`Cr^(3+)//Cr` has most NEGATIVE value of standard reduction potential .Hence `Cr^(3+)` is the most oxidized spedcies.
So,Cr is oxidation performing and `Cr^(3+)` is a product of oxidation .
Cr has LEAST standard reduction potential and hence ,`Cr^(3+)` is highest STABLE among four.
Discussion
18964.

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol ?

Answer»

HCL + `anhyd.ZnCl_2`
NACL
`PCl_5`
`SOCl_2`

ANSWER :B
Discussion
18965.

When SO_2 reacts with water, the compound formed is

Answer»

`H_2S`
S
`SO_3`
`H_2SO_3`

ANSWER :D
Discussion
18966.

Which of the following substances are blue

Answer»

`Fe(BO_(2))_(2)`
`CoAl_(2)O_(4)`
`Co(BO_(2))_(2)`
`NaCoPO_(4)`

Solution :`CoAl_(2)O_(4)(BO_(2))_(2)` and `NaCOPO_(4)` are BLUE COLOUR SUBSTANCES
Discussion
18967.

Zinc blende is concentrated by….. Process

Answer»

SOLUTION :FROTH FLOATATION
Discussion
18968.

The specific reaction rate constant for a first, order reaction is 60xx10^-4sec^-1 If the initial concentration of the reaction is 0.01 mole per litre, the rate is:

Answer»

`60xx10^-6Msec^-1`
`36xx10^-4Msec^-1`
`60xx10^-2Msec^-1`
`36xx10^-1Msec^-1`

ANSWER :A
Discussion
18969.

Which of the following given statesment is incorrect?

Answer»

F-centres generation is RESPONSIBLE factor for IMPARTING colour to the crystal
Frenkel DEFECT is USUALLY shown by ionic COMPOUND having low coordination number
Stoichiometry of crystal remains uneffected due to schottkydefect
Density of crystal always increses due to susbtitutional impurity defect

Answer :D
Discussion
18970.

Which of the following statements are true with respect to electronic displacement in a covalent bond? (1) Inductive effect operates through pi bond. (2) Resonance effect operates through sigmabond. (3) Inductive effect operates through sigmabond. (4) Resonance effect operates through pi bond. (5) Resonance and inductive effects operate through sigma bond.

Answer»

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

Solution :The inductive effect is transmitted through` sigma ` bond and weakens as the distance between the SUBSTITUENTS and the reactive centre increases. But in resonance`pi` ELECTRONS shifting takes place giving permanent polarity onthe chain.
Discussion
18971.

Vulcanization of rubber was ubtroduced by

Answer»

Cahn -Ingold
FISHER
CHARLES good year
Newman

Answer :C
Discussion
18972.

Which of the following reactions will give cinnamic acid?

Answer»

`C_(6)H_(5)CH = O underset(H_(3)overset(+)O)overset((CH_(3)CO)_(2)O // CH_(3)COONa)to`
`C_(6)H_(5)CH = O underset(H_(3)overset(+)O)overset((CH_(3))CH=O // OH^(-))to`
`C_(6)H_(5)CH = O underset(H_(3)overset(+)O)overset((CH_(2)COOC_(2)H_(5))_(2) // "PYRIDINE")to`
`C_(6)H_(5)COOC_(2)H_(5) = O overset(H_(3)overset(+)O)to`

Solution :
Discussion
18973.

Which of the following statements about amorphous solids is incorrect?

Answer»

they MELT over a range of temperature
they are anisotropic
there is no orderly ARRANGEMENT of PARTICLES
 they are rigid and incompressible.

Solution :Amorphous solids are isotropic as they show same properties in all DIRECTIONS
Discussion
18974.

Whichof thefollowingcan beusedpreparemethaneby itsactionwithwater ?

Answer»

ALUMINIUM CARBIDE
BERYLLIUM carbide
Calcium carbide
Silicon carbide

ANSWER :A,B
Discussion
18975.

The vitamin which is neither soluble in wter nor in fat is

Answer»

BIOTIN
PHYLLOQUINONE
THIAMINE
ergocaleiferol

ANSWER :A
Discussion
18976.

Which of the following molecules involves sp^(2) hybridisation of the carbon atoms ?

Answer»

`CH_(3)CH_(3)`
`CH_(2)=CH_(2)`
`HC-=CH`
`CH_(3)UNDERSET(CH_(3)"")underset(|"")(CHCH_(3))`

ANSWER :B
Discussion
18977.

When an aqueous solution of hypochlorite is heated:

Answer»

CHLORINE is EVOLVED
CHLORITE is formed
Chlorate is formed
Chlorine PEROXIDE is formed

Answer :C
Discussion
18978.

Which of the following is a protein ?

Answer»

Glycogen
Amylopectin
Keratin
Lecithin.

Answer :C
Discussion
18979.

Thereagentusedfor the detection of a carboxyl group in a organic compound is

Answer»

`PCl_5`
`SOCl_2`
`NA`
`NaHCO_3`

ANSWER :D
Discussion
18980.

Which of the following is/are correct regarding nitrogen family

Answer»

Nitrogne is restricted to a MAXIMUM COVALENCY of 4 as only four orbitals are available for bonding
The single `N-N` bond is WEAKER than the single `P -P` bond
The catenation TENDENCY is weaker in nitrogen as compared to phosphorous
Nitrogen forms `p pi - p pi` bond as well as `p pi - d pi` bonds

Solution :Nitrogen can not form `p pi -DPI` bond because nitrogen has no d-orbitals
Discussion
18981.

To stop the oxidation reaction of alcohol at aldehyde / ketone stage ……………………. is used as anoxidising agent.

Answer»

SOLUTION :PYRIDINIUM CHLOROCHROMATE
Discussion
18982.

Why are only Pb^(2+),Ag^(o+) and Hg_(2)^(2+) ions precipitated in group I?

Answer»

Solution :Out of all the chlorides those of `PB^(2+), Ag^(o+)` and `Hg_(2)^(2+)` are insoluble HCl is the reagent group I. thus chlorides of `Pb^(2+),Ag^(o+)` and `Hg_(2)^(2+)` are precipitated I group I.
`AgNO_(3)+Hcltounderset(("white ppt."))(AgCl(s))+HNO_(3)`
Other cations remain in solution because their chlorides are SOLUBLE.
Discussion
18983.

The vapour pressure of pure benzene at certain temperature is 0.850 bars. A non-volatile, non-electrolyte solid weighing 0.5 grams when added to 39 grams of benzene (molar mass 78grams), vapour pressure of the solution becomes 0.845 bars. What is the molar mass of the solid substance?

Answer»

SOLUTION :`(P^(@)-P)/(P_(1)^(@))=(w_(2)xxM_(1))/(w_(1)xxM_(2))`
`M_(2)=(w_(2)xxM_(1)xxP_(1)^(@))/((P^(@)-P)xxw_(1))`
`M_(2)=(0.5xx78xx0.85)/((0.85-0.845)xx39)`
`M_(2)="170 g MOL"^(-1)`
Discussion
18984.

What is the role of graphite rod in the electro metallurgy of aluminium ?

Answer»

SOLUTION :During the electrolysis of alumina, the `O_2` GAS is liberated at a high temperature. `O_2` gas reacts with graphite electrodes to form CO and `CO_2`, there by preventing oxygen to react with ALUMINUM to form `Al_2O_3` again.
Anode : `C_((s)) + O_((L))^(2-) to CO_((g)) + 2e^(-)`
`C_((s)) + 2O_((l))^(2-) to CO_(2(g))+ 4e^(-)`
Discussion
18985.

Which of the following is copper(I) compound?

Answer»

`[CU(H_(2)O)_(4)]^(2+)`
`[Cu(CN)_(4)]^(3-)`
`[Cu(NH_(3))_(4)]^(2+)`
All of these

Answer :B
Discussion
18986.

Which of the following configurations would you expect to have the highest second ionisation enthalpy?

Answer»

`1s^(2)2S^(2)`
`1s^(2)2s^(2)2p^(4)`
`1s^(2)2s^(2)2p^(6)3s^(1)`
`1s^(2)2s^(2)2p^(1)`

Solution :After the LOSS of one electron, the atom acquires stable electronic configuration of noble GAS `(1s^(2)2s^(2)2p^(6))`. THEREFORE second ionisation enthalpy will be very HIGH.
Discussion
18987.

Which of the following are biodegradable polymers ?

Answer»

PHBV
NYLON 2
Nylon 6
All of the above

Answer :D
Discussion
18988.

Which of the following is the best method for synthesis of 1-bromo-3-chlorobenzene?

Answer»




SOLUTION :
Discussion
18989.

Which of following gives only basic product on hydrolysis :-

Answer»

`PCl_(5)`
`NCl_(3)`
`Mg_(3)N_(2)`
`SO_(2)`

Solution :(i) `P+"dry "Cl_(2) to PCl_(3)`
(ii) `P+SO_(2)Cl_(2) to PCl_(5)`
(iii) `P+SOCl_(2) to PCl_(3)`
(iv) `PCl_(5)+2Ag to PCl_(3) +2AgCl`
Discussion
18990.

When a whitewaxy solid (A) is heatedin an inertatmosphere , it is convertintoitsallotropicform (B).(A) reactswithvery dilutesolutionits allotropic with very dilutesolutionof KOHto form ahighly poisonous gas (C)havingsmellof rottenfish. (C) reactswith excessof chlorineto form(D) whichon hydrolysisproducesthe compound (E). Identify (A), (B),(C), (D) and(E) and give the reactioninvolved .

Answer»

Solution :A : whitephosphour B : redphoshpours C : `PH_(3)`, D : `PCl_(5)`, E : `H_(3)PO_(4)`
Discussion
18991.

What is the effect of adding a catalyst on Gibb's energy (DeltaG) of a reaction?

Answer»

SOLUTION :Gibb.s ENERGY REMAINS UNCHANGED.
Discussion
18992.

Which of thefollowingcompoudwillnot givesketoneson acid hydrolysis.

Answer»

`CH_(3) - OVERSET(NO_(2))overset(|)(CH) - CH_(3)`
` CH_(3) - overset(NO_(2))overset(|)(CH) - CH_(2) - CH_(3)`
`CH_(3) - CH_(2) - overset(NO_(2))overset(|)(CH) - CH_(2) - CH_(3)`
`CH_(3) - overset(OH)overset(|)(CH)-CH_(2) - CH_(3)`

Answer :D
Discussion
18993.

What will be the effect of increasing temperature of sea water on aquatic life?

Answer»

Solution :They will have difficulty in GETTING OXYGEN because solubility of oxygen decreases with increase in temperature)
Discussion
18994.

Which of the following are pairs of isotopes

Answer»

`._(1)^(2)H^(+) and ._(1)^(3)H`
`._(1)^(3)H and ._(2)^(4)H^(-)`
`._(2)^(3)He and ._(2)^(4)He`
`._(6)^(12)C and ._(7)^(14)N^(+)`

Solution :Isotopes have same ATOMIC number but different mass number
Discussion
18995.

Which of the following will periodic cleavage ?

Answer»

`MeOC-overset(OH)overset(|)CH-underset(OH)underset(|)CH-COOMe`

`Me-underset(OH)underset(|)CH-underset(NH_(2))underset(|)CH-Me`
`Me-underset(OH)underset(|)CH-CH_(2)-OH`

SOLUTION :N//A
Discussion
18996.

The time required for a current of 3 amp to decompose electrolytically 18 g of H_(2)O is

Answer»

18 hours
36 hours
9 hours
18 seconds

Answer :A
Discussion
18997.

Which is nottrue for a detergent molecule ?

Answer»

It has a non-POLAR organic PART and a polar group
It is not easily biodegradable
It is a sodium salt of FATTY acid
It is a SURFACE ACTIVE agent

Solution :It is a sodium salt of fatty acid
Discussion
18998.

Which one of the following is C - O - H bond angle in methanol ?

Answer»

`109.5^@`
`104^@`
`90^@`
`108.9^@`

SOLUTION :`108.9^@`
Discussion
18999.

Which of the following statement are correct regarding to galvanic cell ?

Answer»

A reaction is spontaneous from left to right if `E_("CELL") GT 0`
A reaction OCCURS from right to left if `E_("cell") lt 0`
If the system is at equilibrium no net reaction occurs
`E_("cell")` is TEMPERATURE - independent

Solution :`E_("cell") gt 0` spontaneous from left to right
`E_("cell") lt 0` reaction occurs from right to left at equilibrium no net reaction occurs
Discussion
19000.

Three electrolytic cell A,B, and C contaning solutions of ZnSO_(4), AgNO_(3), and CuSO_(4), respectively, are connected in series. A steady current of 1.5A was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow ? What mass of copper and zinc were deposited ?

Answer»

Solution :`AG^(+)+e^(-)rarr Ag(s)`
108 g of SILVER is DEPOSITED by 96500 C.
`"1.45 g silver is deposited by"=(96500xx1.45)/(108)`
`=1295.6C`
`Q=Ixxt`
`1295.6=1.5xxt`
`t=(12956)/(1.5)=863s`
In cell A, the electrode reaction is 5.6
`Zn^(2+)+2e^(-)rarr Zn`
2F of electricity deposit Zn = 65.3 g
`"1295.6 of electricity deposit Zn"=(65.3xx1295.6)/(2xx96500)`
`=0.438g`
In cell C, the electrode reaction is
`Cu^(2+)+2e^(-)rarrCu(s)`
2F of electricity deposit Cu = 63.5 g
`"1295.6 of electricity deposit Cu"=(63.5xx1295.6)/(2xx96500)`
`=0.426g`
Discussion