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13551.

Which of the following coenzymes assist enzymatic reduction

Answer»

NADH
NADPH
`FADH_(2)`
All of these

Solution :All the given COENZYMES CONTAINS HYDROGEN HENCE all these coenzymes assist enzymatic reduction.
Hence choice (d) is correct. While (a), (b)and (C) are incorrect.
Discussion
13552.

Which of the following notations, describing a subshell with the quantum numbers n and l, is not correct?

Answer»

`n=3,l=2,to3d`
`n=5,l=0to5s`
`n=4,l=3to4f`
`n=5,l=4to5f`

SOLUTION :for n=5,l=4 `to` 5G
Discussion
13553.

underset("Pyridine")overset(SOCl_(2))to Product is:

Answer»




Solution :It is a `S_(N)2` reaction, so inversion taks PLACE at `SP'` carbon.
Discussion
13554.

Which of the following is not a characteristic of a covalent compound ?

Answer»

Low melting point
No definite geometry
INSOLUBLE in polar SOLVENT
Small DIFFERENCE in electronegativity between the COMBINING ATOMS

Answer :B
Discussion
13555.

Which of the following statements regarding lanthanides is false?

Answer»

All lanthanides are SOLID at ROOM temperature.
Their usual oxidation state is +3.
They can be separated from ONE another by ion-exchange method
Ionicradiiof trivalentlanthanidessteadily increases with increase in atomic number.

Solution :Lanthanides contraction is that phenomenon where the IONIC radii of TRIVALENT lanthanides steadily decreases with increases in atomic number .
Discussion
13556.

Which compounds enters the body and create possibility of cancer ?

Answer»

`CHCl_(3)`
`C Cl_(2)F_(2)`
`CH_(2)Cl_(2)`
DDT

Answer :D
Discussion
13557.

What is the difference between the nature of pi-bonds present in H_3PO_3 and HNO_3 molecules?

Answer»

SOLUTION :PI-bond PRESENT in `H_3PO_3` is `ppi - d pi` bond and `p pi - p pi` bond in `HNO_3`
Discussion
13558.

Which of the following pairs of substance would give same gaseous product on reaction with water?

Answer»

NA and `Na_2O_2`
CA and `CaH_2`
Ca and CaO
Ba and `BaO_2` or (E) Ca and `CaC_2`

SOLUTION :NA
Discussion
13559.

Which of the following group of elements eliminates electron easily

Answer»

N, P, As
O, S, Se
Li, NA, K
Cl, BA, I

Solution :Li, Na, K, CONTAINS only one `e^(-)` in outer most orbit.
Discussion
13560.

Which of the following complex acts as good reducing agent ?

Answer»

`[Cu(NH_(3))]^(2+)`
`[Ag(NH_(3))_(2)]^(+)`
`[Fe(CN)_(6)]^(3-)`
`[Co(NO_(2))_(6)]^(4-)`

Solution :(d)`[Co(NO_(2))_(6)]^(4-)to[Co(NO_(2))_(6)]^(3-)+e^(-)`
(Good R.A.) LTBR. Electron is removed from 5s-orbital
(TRANSFERENCE from 3d to 5s )
Discussion
13561.

Which is not a characteristic property of carbon?

Answer»

Catenation
Multiple BOND formation
Availability of d ORBITALS for bonding
Highest ELECTRONEGATIVITY in the group

Answer :C
Discussion
13562.

What is 'X' in the following reaction ?C_2H_5Cl + X rarr C_2H_5OH + KCl

Answer»

`KHCO_3`
ALCOHOLIC KOH
Aqueous KOH
`K_2 CO_3`

ANSWER :C
Discussion
13563.

Vitamin A is present in :

Answer»

FISH LIVER oil
Milk
butter
All

Answer :D
Discussion
13564.

Which of the following compound/ion is pi-bonded organometallic compound(s) as well as follow Sidgwick EAN rule?

Answer»

Ferrocene
Zeise's SALT
`[Fe(CO)_(5)]^(+)`
Cis-platin

Solution :`[overset(+2)Fe(ETA^(5)-C_(5)H_(5))_(2)]implies "ENA"=26-2+12=36`
Discussion
13565.

To change the molal conc. to one half, one of the following should be adopted

Answer»

WEIGHT of the should be doubled
weight of the solvent should be doubled
VOLUME of the solvent should be doubled
weight of the SOLUTION should be doubled

Answer :B
Discussion
13566.

Which ofthe following represents a synthetic detergent?

Answer»

`C_15H_31COOK`
`CH_3[CH_2]_16COONa`

None of these

Solution :The most WIDELY USED domestic detergent is the SODIUM dodecyl BENZENE sulphonate (SDS).
Discussion
13567.

Which law directly explains the law of conservation of mass?

Answer»

DALTON's law
Avogadro's law
Berzelius law
Hund's rule

Solution :FACTUAL QUESTION
Discussion
13568.

Which of the following statements are incorrect about receptor proteins?

Answer»

Majority of receptor proteins are embedded in the cell membranes.
The active site of receptor proteins opens on the inside region of the cell.
Chemical MESSENGERS are RECEIVED at the binding sites of receptor proteins.
SHAPE of receptor doesn't change during attachment of messenger. 

Solution :In the bodys message between two neurons and that between neuron to muscles is communicated through certain chemicals. These chemicals, known as chemical messengers are received at the binding site of receptors proteins. To accommodate a messenger, shape of the receptor site CHANGES. This brings about the transfer of message into the cell. Thus, chemical messenger gives message to the cell without entering the cell.
Discussion
13569.

Which one is the weakest acid

Answer»

`HNO_(3)`
`HClO_(4)`
`H_(2)SO_(4)`
HBr

Solution :`underset("Acidic CHARACTER decreases")(HClO_(4) gt H_(2)SO_(4) gt HBr gt HNO_(3))`
Discussion
13570.

What is fuming nitric acid ? What colour is it ?

Answer»

SOLUTION :Concentrated nitric ACID in which oxides of nitrogen (i.e., `NO, NO_(2), N_(2)O_(3)`, etc.) are DISSOLVED is called fuming nitric acid. Its COLOUR is yellow.
Discussion
13571.

Which of the following compounds can be detected by Molisch's test :

Answer»

NITRO compounds
Sugars
Amines
Primary alcohols

Solution :Molisch's Test : This is a general testfor carbonhydrates. One or two drops of alcoholic solution of `alpha`-NAPHTHOL is added to `2 ml` glucose solution. `1 ml` of conc. `H_(2)SO_(4)` solution is added carefully along the sides of the test tube. The FORMATION of a violet ring at the junction of two liquids confirms the presence of a CARBOHYDRATE of sugar.
Discussion
13572.

Which of the following is the major source of magnesium and is also a double salt

Answer»

`MgCO_(3)`
`Mg_(2)P_(2)O_(7)`

`KCl.MgCl_(2).6H_(2)O`

ANSWER :D
Discussion
13573.

Which of the following electronic configuration belong to transition elements ?

Answer»

KL `3s^2p^6d^5, 4s^1`
KL `3s^2p^6d^10, 4s^2p^3`
KL `3s^2p^6d^10, 4s^24p`
KLM `4s^2p^6d^10, 5s^25p^1`

ANSWER :A
Discussion
13574.

X overset(Y)(to) Adipic acid . Here X and Y are respectively

Answer»

Cyclohexene , Bayer's REAGENT
Benzene , HOT ACIDIFIED `KMnO_(4)`
Cyclohexene , Hot acidified `KMnO_(4)`
CYCLOPENTENE , Hot acidified `KMnO_(4)`

Answer :A
Discussion
13575.

Two liquids A and B are miscible over the whole range of composition and may be treated as ideal (obeying Raoult's law.) At 350K the vapour pressure of pure A is 24.0kPa and of pure B is 12.0 kPa. A mixture of 60% A and 40% B is distilled at this temperature, what is the pressure in a closed distillation apparatus from which air is exclued ? A small amount of the distillate is collected and and redistilled at 350K What is the composition

Answer»


Solution :`P_(T)=(6)/(10)xx24+(0.4)/(10)xx12(16xx12)/(10)=(192)/(10)=19.2kPa`
`P_(A)'=X_(A)P_(A)=(6)/(10)xx24(144)/(10)=14.4=X_(A)'xx19.2`
so `X_(A)'=(144)192)=75% X_(A)'=25%`
so `P_(T)=(3)/(4)xx24+(1)/(4)xx12=18+3=21kPa`
`& P_(A)=(3)/(4)xx24=18=X_(A)'(21)`
so `X_(A)'=(18)/(21)=(6)/(7)=85.7%` of` A`
Discussion
13576.

What is the thermodynamic criteria for the feasibility of a reaction ?

Answer»


ANSWER :`TRIANGLEG` should be –ve or LOG K = + ve.
Discussion
13577.

The value of bohr's radius for hydrogen atom is:

Answer»

`0.529xx10(-8)` CM
`0.529xx10(-10)` m
0.529`OVERSET@A`
All of these

Answer :D
Discussion
13578.

The rusting of iron takes place as follows 2H^(+)+2e^(-)+1//2O_(2)rarrH_(2)O(l), E^(@)=+1.23 VFe^(2+)+2e^(-)rarrFe(s), E^(@)=-0.44VCalculate DeltaG^(@)for the net process

Answer»

`-322 kJ mol^(-1)`
`-161 kJ mol^(-1)`
`-152 kJ mol^(-1)`
`-76 kJ mol^(-1)`

Solution :`FE(s)RARRFE^(2+)+2e^(-), ""E^(@)=0.44 V`
`(2H^(+)+2e^(-)+1//2O_(2)rarrH_(2)O(l),""E^(@)=+1.23 V)/(Fe(s)+2H^(+)+1//2O_(2)rarrFe^(2+)+H_(2)O,)`
`E_("CELL")^(@)=0.44+1.23=1.67 V`
`thereforeDeltaG^(@)="-nF " E_("cell")^(@)=-2xx96500xx1.67=-322 kJ`.
Discussion
13579.

Which of the following compounds can exist as optical isomers?

Answer»




ANSWER :B
Discussion
13580.

Which one of the following nuclear reaction is correct :

Answer»

`""_(6) C^(13) + ""_(1) H^(1) to ""_(7) N^(13) + ""_(-1) beta^(0) + gamma`
`""_(11) Na^(23) + ""_(1) H^(1) to ""_(10) Ne^(20) + ""_(2) He^(4)`
`""_(13) Al^(23) + ""_(0) n^(1) to ""_(11) Na^(23) + ""_(-1) E^(0)`
`""_(12) Mg^(24) + ""_(2) He^(4) to ""_(13) Al^(27) + ""_(0) n^(1)`

Solution :`""_(11) Na^(13) + ""_(1) H^(1) to ""_(10) Ne^(20) + ""_(2) He^(4)`
Discussion
13581.

Which of the following polymers can be used for lubrication and as an insulator ?

Answer»

SBR
PVC
PTFE
PAN

ANSWER :C
Discussion
13582.

Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented ?

Answer»

REVERSE osmosis takes place
Electroosmosis takes place
DISPERSION medium beging to move
Dispersion medium BECOMES STATIONARY

Answer :B::C
Discussion
13583.

Zeolites are minerals of the composition M_((x/n)) [[AlO_2]_x (SiO_2)_y].ZH_2O Where 'n' is the charge on the metal cation. These structure contain various ring which results in formation of a fairly open structure containing channels and cavities at molecular level (2 to 11A) in diameter). They may be used to trap molecules of various sizes, this makes them very useful as "Selective absorbants" or as "molecular sieves". In the structure of zeolites: (A) Each Al atom is attached to 'p' oxygen atoms directly (B) Each Si atom is attached to 'q' oxygen atoms directly (C) Each Al atom is attached to 'r' Si atoms directly (D) Each O atom is # hydridized.Find (p+q+r+t)

Answer»


SOLUTION :`p=4, q=4 , r=0, t=2`
Discussion
13584.

Which of the following species has four lone pairs of electrons in its valance shell ?

Answer»

I
`O^-`
`CL^-`
He

Answer :C
Discussion
13585.

Which one of the following is used to convert acetyl chloride to acetone?

Answer»

`CdCl_2`
`CrO_2Cl_2`
`Cu_2Cl_2`
`NACL`

SOLUTION :`CdCl_2`
Discussion
13586.

Which one of the following will be aromatic?

Answer»




ANSWER :A, D
Discussion
13587.

Which of the following order of Bond strength is/are correct :- (a) C-CgtS-SgtP-PgtO-O (b) H-HgtN=NgtO=OgtF-F (c) Cl-ClgtBr-BrgtF-FgtI-I (d) 2ppi-2ppigt2ppi-3ppigt2ppi-3ppigt3ppi-3ppi Option :-

Answer»

a, B, c
a, c, d
c, d
Only a

Answer :B
Discussion
13588.

The value of 'spin only' magnetic moment of one of the following configuration is 2.84 BM. The correct one is

Answer»

`d^(4)` (in STRONG field ligand)
`d^(2)` (in WEAK field ligand)
`d^(3)` (In weak as well as in strong field ligand)
`d^(5)` (in strong field ligand)

ANSWER :B
Discussion
13589.

Which of the following is the purine base ?

Answer»

CYTOSINE
THYMINE
ADENINE
Uracil

Solution :Adenine
Discussion
13590.

Which one of the following is added to gold sol to protect it?

Answer»

GELATINE SOL
Gum
Starch
Basic dye

Solution :Gelatine sol
Discussion
13591.

Which of the following statement is false.

Answer»

In `[PtCl_(2)(NH_(3))_(4)]^(+2)` complex ion, the cis-form is optically inactive
In `[Fe(C_(2)O_(4))_(3)]^(3-)`, GEOMETRICAL isomerism does not exist, while optical isomerism exists
In `["Mabed"]^(npm)` letrahedral COMPLEXES, optical isomerism cannot be observed
In `["Mabed"]^(npm)`square planar complexes, optical isomerism can be observed

Solution :For `MF[M(a-A)_(3)]^(npm)` geometrical isomerism not possible.
Discussion
13592.

Which is not correct about valence bond theory of metals

Answer»

It is also CALLED resonance theory
It was proposed by Linus Pauling
The METALLIC bond is essentially a polar (or) non polar covalent bond
It explains metallic LUSTRE. 

Answer :D
Discussion
13593.

What is the repeating unit in the condensation polymer obtained by combining HOOC CH_2COOH (succinic acid) and H_2NCH_2CH_2NH_2 (ethylene diamine) ?

Answer»

SOLUTION :`nHOOC-CH_2CH_2COOH + nH_2NCH_2CH_2NH_2to(-OVERSET(O)overset(||)C-CH_2CH_2overset(O)overset(||)C-overset(H)overset(|)N- CH_2CH_2overset(H)overset(|)N-)_n`
Discussion
13594.

Which is incorrect order for dehydration of alcohol ?

Answer»




`CH_(3)CH_(2)underset(OH)underset("|")"CH"CH_(3) GT CH_(3)CH_(2)CH_(2)CH_(2)OH`

Solution :
The second dehydration takes place through the formation of resonance stabilised carbocation. THUS, the correct order is
Discussion
13595.

What is rate of reaction?

Answer»

Solution :Rate:the change in CONCENTRATION of reactant and PRODUCT with UNIT time is called rate of reaction.
`"Rate"=("Change in concentration of reactant of product")/("Change in time")`
More ACCURATE by the rate of reaction is (i)The change in concentration of reactant in unit time or decrease in concentration of reactant in unit time .(ii)The increase in concentration of product in unit time.
Discussion
13596.

Which of the following properties are not correct for enantiomers?

Answer»

They have identical PHYSICAL properties except for the direction of rotation of the plane polarised light
They have identical biological properties
They have identical CHEMICAL properties but react differently TOWARDS other optically active substances
Equal mixture of d- and l-enantiomers is called racemic mixture.

Answer :B
Discussion
13597.

When an electric cell is charged, then

Answer»

VOLTAGE of cell INCREASES
electrolyte of cell DILUTES
RESISTANCE of cell increases
NONE of these

Discussion
13598.

Which of the following process involvessmelting ?

Answer»

`ZnCO_(3)overset(Delta)rarr ZnO+CO_(2)`
`Fe_(2)O_(3)+3Coverset("HEAT")rarr 2Fe+3CO`
`2PbS+3O_(2)overset("Heat")rarr 2PbO+2SO_(2)`
`Al_(2)O_(3). 2H_(2)Ooverset("Heat")rarrAl_(2)O_(3)+2H_(2)O`

Answer :B
Discussion
13599.

Which of the following is a molecular solid ?

Answer»

MgO
AgCl
`CO_(2)`
Pd

Solution :`CO_(2)` is a MOLECULAR SOLID ,
Discussion
13600.

Which acid is not formed by the action of water on phosphorous pentoxide ?

Answer»

`H_3PO_7`
`H_4P_2O_7`
`H_3PO_4`
`H_3PO_3`

ANSWER :D
Discussion