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13851.

Which is the group that decreases the acid strength of phenol?

Answer»

`-NO_(2)`
`-CN^(-)`
`-NH_(2)`
Both (a) and (B)

Answer :C
Discussion
13852.

Which incorrect about fuel cells ?

Answer»

Cells continuously run as LONG as fuels are supplied
These are more efficient and free from pollution
These are used to provide power and drinking water to ASTRONAUTS in space programme
FUEL cell has LOW EFFICIENCY

Solution :Efficiency very high .
Discussion
13853.

Unit of rate constant for a second order reaction are L mol^-1 s^-1.

Answer»
Discussion
13854.

When KMnO_4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because

Answer»

`CO_(2)` is FORMED as the PRODUCT
REACTION is exothermic .
`MnO_(4)^(-)`
`Mn^(2+)` acts as autocatalyst.

Solution :`Mn^(2+)` acts as autocatalyst.
Discussion
13855.

Which of the following compounds will undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction. (i) Methanal, (ii) 2-Methylpentanal, (iii) BEnzaldehyde, (iv) Benzophenone (v) Cyclohexanone, (vi) 1-Phenylpropanone, (vii) Phenylacetaldehyde, (viii) Butan-1-ol (ix). 2,2-Dimethylbutanal.

Answer»

Solution :I. 2-Methylpentanal (ii), cyclohexanone (v), 1-phenylpropanone (vI) and phenylacetaldehyde (vii) CONTAIN one or more `alpha`-hydrogens and hence UNDERGO aldol condensation. The reactions and the structures of the expected products are given below:
.
II. METHANAL (i), banzaldehyde (iii) and 2,2-dimethylbutanal (ix) do not contain `alpha`-hydrogen and hence undergo Cannizzaro reaction. the reactions and the structures of the expected products are given below:
.
III. Benzophenone (iv) is a KETONE having no `alpha`-hydrogen/s while butan-1-ol (viii) is an alcohol. both of these neither undergo aldol condensation nor cannizzaro reaction.
Discussion
13856.

Which one is not antioxidant ?

Answer»

CITRIC ACID
Ascorbic acid
Sorbic acid
Butylated HYDROXY TOLUENE 

SOLUTION :Sorbic acid
Discussion
13857.

Which of the following reaction is expected to readily gives hydrocarbon product in good yields

Answer»

`RCOOKoverset"Oxidation Electrolysis"to `
`RCOOAgoverset(I_2)to`
`CH_3-CH_3underset"HV"overset(Cl_2)to`
`(CH_3)_2 C Cloverset(C_2H_5OH)to `

Solution :`R-COOK+2H_2O overset"Electrolysis"to underset"ALKANE"(R-R)+CO_2 + 2KOH + H_2`
Discussion
13858.

Which of the following statements reagarding interhalogens is not correct?

Answer»

Interhalogens INVOLVE covalent bonding
Interhalogens are less reactive than HALOGENS
`(ICI_3)_2` in fused from shows enhanced ELECTRICAL conductivity
Interhalogens of the FORMULA `XX_4`

ANSWER :B
Discussion
13859.

Which of the following properties of atom could be explained correctly by Thomson model of atom?

Answer»

OVERAL neutrality of atom.
Spectra of hydrogen atom.
Positioni of electons, protons and NEUTRONS in atom.
Statbility of atom.

Answer :A
Discussion
13860.

Which of the following is not a food preservative ?

Answer»

COMMON salt
Sucrose
Sodium benzoate
Sucralose

Answer :D
Discussion
13861.

Tungsten has bcc lattice. Each edge of the unit cell is 316 pm and the density of the metal is 19.35g cm^(-3). How many atoms are present in 50 g of this element?

Answer»


Solution : Z=2 for BCC lattice, a=316 pm, d = 19.35 g `cm^(-3)`, M=50g
Volume of 50 g tungsten = `("Mass")/("Density") =(50)/(19.35)=2.58 cm^3`
Volume of UNIT cell = `a^3 (316 xx 10^(-10))^3 cm^3 = 3.15 xx 10^(-23) cm^3`
Number of unit CELLS = `("Volume of element")/("Volume of unit cell")=(2.58)/(3.15 xx 10^(-23)) = 8.19 xx 10^(22)`
`:.` Number of ATOMS in 50 g element = `2 xx 8.19 xx 10^(22)= 1.638 xx 10^(23)` atoms = `1.64 xx 10^(23)` atoms
Discussion
13862.

Which of the following compounds are coloured due to charge transfer ? (a) KMnO_(4)""(b) K_(2)Cr_(2)O_(7) (c ) K_(2)CrO_(4)""(d) Na_(2)[Fe(CN)_(5)NO] (e ) CrO_(2)Cl_(2)""(f) K_(3)[VO_(4)] (g) [Fe(H_(2)O)_(5)NO]SO_(4)

Answer»


Solution :(a),(B),(c ),(d),(e ), (F),(G)
Discussion
13863.

Answer the following : (i) Which neutral molecule would be isoelectronic with ClO^(-)? (ii) Of Bi (V) and Sb (V) which may be a stronger oxidising agent and why?

Answer»

SOLUTION :`CIO^(-)` has a total of 26 (17+ 8+1) electrons. The neutral molecule having 26 electrons = CIF
`therefore CIO^(-)`is ISOELECTRONIC with CIF.
Another neutral molecule having 26 electrons is `OF_2`
`thereforeCIO^-`is ALSO isoelectronic with the neutral molecule `OF_2.`
Discussion
13864.

Why amines have higher boiling points than corresponding alkanes ?

Answer»

SOLUTION :It is DUE to their POLAR nature and INTERMOLECULAR hydrogen bionding.
Discussion
13865.

Which of the following has more pKa value ?

Answer»




ANSWER :A
Discussion
13866.

When alkyl halide is treated with zinc-copper couple and ethanol we get?

Answer»

Alkane
Alkyne
Alkene
Ether

Answer :A
Discussion
13867.

Which of the following statement is correct for a reaction 2X + YrarrProducts:

Answer»

The RATE of disappearance of X = TWICE the rate of disappearance of Y
The rate of disappearance of X = 1/2 rate of APPEARANCE of PRODUCTS
The rate of apperance of products = `1//2` the rate of disapperance of Y
The rate of apperance of products = `1//2` the rate of disapperance of X

Answer :C
Discussion
13868.

Which fluroide of xenon is impossible:

Answer»

`XeF_2`
`XeF_3`
`XeF_4`
`XeF_6`

ANSWER :B
Discussion
13869.

Which-sub shell is filled up progressively in actinoids

Answer»

4f
5f
6d
7s

Answer :B
Discussion
13870.

Three electrolytic cells A,B and C containing electrolytes ZnSO_(4),AgNO_(3) and CuSO_(4) respectively were connected in series. A steady current of 1.50 ampere was passed through them until 1.45g of Ag were deposited at the cathode of cell B. how long did the current flow? what mass of copper and zinc were deposited? (At. wts. of Cu=63.5,Zn=65.3,Ag=108)

Answer»

Solution :`Ag^(+)+e^(-)TOAG,` i.e., 108 g of Ag are deposited by 1F=`96500C`
`therefore1.45g` of Ag will be deposited by `(96500)/(108)xx1.45C=1295.6C`
`Q=Ixxt` or `t=Q//I=1295.6//1.50=863.7s=14`min, 24sec.
`Cu^(2+)+2E^(-)TOCU`
i.e., `2xx96500C` deposit Cu=63.5g `therefore1295.6C` will deposit `Cu=(63.5)/(2xx96500)xx1295.6=0.426g`
`Zn^(2+)+2e^(-)TOZN. therefore` Zn deposited`=(65.3)/(2xx96500)xx1295.6=0.438g`,
Discussion
13871.

Which noble gas has the least tendency to form compounds:

Answer»

He
Ne
Kr
Xe

Answer :A
Discussion
13872.

The shape of XeO_(2)F_(2) molecule is

Answer»

trigonal bipyramidal
square planar
tetrahedral
see-saw

Solution :`XeO_(2)F_(2)` has trigonal bipyramidal geometry, but due to PRESENCE of lone PAIR of electrons on EQUITORIAL position, its actual shape is see-saw.
Discussion
13873.

Three differentbrands of 'liquidchlorine' are availablein themarketfor use in purifyingwater of swimmingpools. All are sold at the samerate of Rs 10 per litreand all are watersolutions. Brand A contains10%hypochlorite (CIO) (wt./vol.) brand B contains 7%availablechlorine (Cl) and brand Ccontains14% sodium hypochlorite(NaClO). Whichof thethree would you buy ?

Answer»

Solution :LET each of the solutions be 100 ml.
Thenfor brand A,wt. of CIO = 10 g
for brand B,wt. of Cl = 7 g
for brand C, wt. of NaCIO = 14 g
Let us now calculate wt. of Cl in each brand
(i) Moles of Cl in CIOin brand `A = 1 XX` moles of CIO
`= 1 xx (10)/( 51.5) ""(CIO = 51.5)`
Wt. of CI in brand `A = (10)/( 51.5) xx 35.5 = 6.89 g`
(ii) Wt. of Cl in brand B = 7 g (given)
(iii) Moles of Cl in NaClO IN BRAND `C = 1xx ` molesof NaCiO
`= 1 xx (14)/(74.5) ""(NaClO= 74.5)`
Wt. of Cl in brand`C = (14)/( 74.5) xx 35.5 = 6.67 g`
As brand Bcontains the highest WEIGHT of Cl, it should be bought, being thecheapest .
Discussion
13874.

Which of the following compound will be most easily attacked by an electrophile

Answer»




Solution :PHENOL is most EASILY ATTACKED by an electrophile because presence of -OH group increases electron density at o- and p-positions.
Discussion
13875.

What will happen if aluminium is heated with coke in an atmosphere of nitrogen?

Answer»

SOLUTION :`Al_(2)O_(3)+N_(2)+3Coverset(Delta)to2AIN+3CO`
Discussion
13876.

Which of the following is a polyhalide ion ?

Answer»

ICL<BR>`I_(3)^(-)`
`I^(-)`
`Br^(-)`

Solution :`I_(3)^(-)` is POLY halide ION
Discussion
13877.

When I^(-) is oxidised by MnO_(4)^(-) is alkaline medium. I^(-) converts into

Answer»

`IO_(3)^(-)`
`I_(2)`
`IO_(4)^(-)`
`IO^(-)`

SOLUTION :In alkaline medium `I^(-)` oxidised to `IO_(3)^(-)`.
`2MnO_(4)^(-) + H_(2)O to 2MnO_(4) + IO_(3)^(-) + 2OH^(-)`
Discussion
13878.

The structure of ClF_5 molecule is

Answer»

SQUARE PYRAMIDAL.
pentagonal bipyramidal.
bent T-shaped.
trigonal bipyramidal.

Solution :square pyramidal.
Discussion
13879.

Which of the following compounds will give HVZ reaction?

Answer»




ANSWER :B::C
Discussion
13880.

What is the effect of acidity ?

Answer»

Imitation and PAIN in STOMACH
Ulcers in stomach
(A) and (B) both
Water in stomach 

Solution :(A) and(B) both
Discussion
13881.

Which process does not occur during formation of CHCl_3 from C_2H_5OH and bleaching powder:

Answer»

Hydrolysis
Oxidation
Elimination
Chlorination

Answer :C
Discussion
13882.

Which of the following is not true about drugreceptors ?

Answer»

Receptor PROTEINS are embedded in the cell membrane .
The chemical KNOWN as chemical messengersare received at the binding sites of receptors.
The receptors show selectively for one chemicalmessenger over the other .
Receptor PROTEIN is DECOMPOSED and destroyedafter removal of chemical MESSENGER .

Solution :Receptor regains its structure and shape after removal of chemical messenger .
Discussion
13883.

Which of the following forms a stable diazonium salt at 273 278 K?

Answer»

Ethylamine
Aniline
Dimethylamine
Benzylamine

Answer :2
Discussion
13884.

Which of the following lanthanoids show +2 oxidation state besides the characterisitc oxidation state +3 lanthanoids ?

Answer»

Ce
E u
Yb
Ho

Answer :B,C
Discussion
13885.

Which reagent is used to prepare fluoromethane by Swartz reaction.

Answer»

`CaF_(2)`
`Ag_(2)S`
`CoF_(2)`
`HgF_(2)`

SOLUTION :[It is `Hg_(2)F_(2)`], Fluoromethane is obtained by reaction of bromomethane or chloromethane with metallic fluorides like `AgF, Hg_(2) F_(2), CoF_(2)` or `SbF_(3)`.
This reaction is called .SWARTZ reaction..
`UNDERSET("methane")underset("Brom")(2CH_(3)Br)+Hg_(2)F_(2)to underset("methane")underset("Fluoro")(3CH_(3)F)+Hg_(2)Br_(2)`
Discussion
13886.

Which does not contain aluminium:

Answer»

Bauxite
Emery
Rutile
Corundum

Answer :C
Discussion
13887.

When a chromateore (A) is fused with sodium carbonate in free excess of air and the product is dissolvedin water, a yellow solution of compound (B)) is obtained. After treatment of this yellow solution with sulphuricacid, compound (C ) can be crystallisedfrom the solution. When compound ( C ) is treatedwith KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reaction.

Answer»

Solution :`A= FeCr_(2)O_(4) ,B= Na_(2) CrO_(4) = Na_(2) Cr_(2)O_(7) .2H_(2)O, D=K_(2)Cr_(2)O_(7)`
Reactions`: underset((A))(4FeCr_(2)O_(4))+8Na_(2)CO_(3)+ 7O_(2)rarr underset((B))(Na_(2) CrO_(4))+2Fe_(2)O_(3)+8 CO_(2)`
`2Na_(2)CrO_(4)+H_(2)SO_(4) rarr underset((C ))(Na_(2)Cr_(2)O_(7)) + Na_(2)SO_(4)+H_(2)O`
`underset((C ))(Na_(2)Cr_(2)O_(7)) +2KCL rarr underset((D))(K_(2)Cr_(2)O_(7))+2NaCl`
Discussion
13888.

When 0.6 g of urea is dissolved in 100 g of water, the water will boil at ( K_(b) for water = 0.52 Km^(-1) and normal boiling point of water = 100^(@)C ) :

Answer»

372.48 K
373.52 K
373.052 K
273.52 K

Solution :`DeltaT_(B)=(K_(B)xxW_(B)xx1000)/(W_(A)xx M_(B))`
`=(0.52xx0.6xx1000)/(100xx60)=0.052^(@)C`
Boiling point of solution `=373+0.052`
`=373.052`
Discussion
13889.

Which shows combined relationship of Boyle's law and Charles' law :

Answer»

`(P_1)/(P_2) = (T_1)/(T_2)`
PV = K
`(P_2)/(P_1) = (V_1)/(V_2)`
`(V_2)/(V_1)=(P_1)/(P_2) XX (T_2)/(T_1)`

ANSWER :D
Discussion
13890.

Which statement is incorrect about catalyst ?

Answer»

It INCREASES the rate of REACTION. 
The effect of catalyst is selective. 
It decreases energy barrier. 
It decreases the value of EQUILIBRIUM constant. 

Solution :It decreases the value of equilibrium constant.
Discussion
13891.

To determine the masses of the isotopes of an element which of the following techniques is useful

Answer»

The acceleration of charged atoms by an ELECTRIC field and their subsequent deflection by a variable magnetic field
The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge
The photographing of the diffraction PATTERNS which arise when X-rays are PASSED through crystals
The BOMBARDMENT of metal foil with alpha particles

Solution :It is the required TECHNIQUE
Discussion
13892.

When 1g atom of carbon is convertedinto 1 g molecule of CO_(2), the heat liberatedis same?

Answer»

A) Whether the carbon is in the form of DIAMOND or graphite
B) Irrespective of whether the volume is kept constant or PRESSURE is kept constant
C) Irrespective of the TEMPERATURE at which the reaction is carried out
D) NONE of the above

Answer :B
Discussion
13893.

WritetheHaworth'sstructureofmaltose.

Answer»

SOLUTION :
Discussion
13894.

Which one of the following is the correct order of ionic radii?

Answer»

`Ce^(+3) lt La^(+3) lt PM^(+3) lt Yb^(+3)`
`Yb^(+3) lt Pm^(+3) lt La^(+3) lt Ce^(+3)`
`Yb^(+3) lt Pm^(+3) lt Ce^(+3) lt La^(+3)`
`Pm^(+3) lt La^(+3) lt Ce^(+3) lt Yb^(+3)`

ANSWER :C
Discussion
13895.

What is meant by non-steroidal anti inflammatory drugs? Give example.

Answer»

SOLUTION :Non-steroidal anti inflammatory drugs REDUCES fever by causing the hypothalamus to OVERRIDE a PROSTAGLANDIN - induced increase in temperature. EG., ibuprofen.
Discussion
13896.

What is the structure of chromate ion?

Answer»

TETRAHEDRAL
Octahedral
Triagonal planar
Linear

Answer :A
Discussion
13897.

Which of the following factor will be usefuk in manufacture of ammonia by Haber's process ?

Answer»

SOLUTION :FE or FEO
Discussion
13898.

Total number of functional groups present in following compound :

Answer»


Solution :Functional GROUP `-overset(O)overset(||)(C)-O` (Ester)
`-underset(O)underset(||)(C) -` (Ketone)
`-underset(|)(N)-` (Amine)
`-OH`
`-underset(O)underset(||)(C)-OH`
Discussion
13899.

The structureof XeF_6 is :

Answer»

pentagonal bipyramidal
DISTORTED octahedral
CAPPED octahedral
square pyramidal

Answer :B::C
Discussion
13900.

Which of the following reagents is commonly used for the detection of sulphide ion

Answer»

1-nitroso-2-naphthol
Potassium ferricyanide
Disodium hydrogen phosphate
Sodium nitroprusside

Solution :The sulphide ION `S^(2-)` reacts with sodiumnitroprusside to GIVE a dark purple complex.
`S^(2-) +Na_(2)[FE(CN)_(5)NO] rarr underset("dark purple complex")(Na_(2)[Fe(CN)_(5)NOS]^(-))`
Discussion