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16801.

Use the given data- E_(Cr_(2)O_(7)^(2-)|Cr^(3+))^(@)=+1.33V, E_(Cl_(2)|Cl^(-))^(@)=+1.36V E_(MnO_(4)^(-)|Mn^(2+))^(@)=+1.51V, E_(Cr^(3+)|Cr)^(@)=-0.74V and find out which of the following is the strongest oxidising agent -

Answer»

`CL^(-)`
`Mn^(2+)`
`MnO_(4)^(-)`
`Cr^(3+)`

ANSWER :C
Discussion
16802.

Which of the following processes is involved in the biochemical treatment of sewage effluents ?

Answer»

Oxidation
Reduction
Dehydration
Fermentation

Answer :A
Discussion
16803.

Which does not form peroxide on heating in air?

Answer»

Na
Be
Ca
Li

Answer :D
Discussion
16804.

Write the strucutre of the product and mechanism of the following reaction: (CH_(3))_(3)C-CH_(2)OH overset(HBr)to

Answer»

SOLUTION :
Discussion
16805.

Upon heating HClO_(3) in the presence of catalytic amount of MnO_(2), a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure HNO_(3) gives Y and Z. Y and Z are, respectively

Answer»

`N_(2)O_(5) and HPO_(3)`
`N_(2)O_(3) and H_(3)PO_(4)`
`N_(2)O_(4) and H_(3)PO_(3)`
`N_(2)O_(4) and HPO_(3)`

Solution :`{:(2KClo_(3) overset(MnO_(2)"," Delta)rarr 2 KCl + underset((W))(3O_(2))),(P_(4)+10O_(2) overset("Oxidation")rarr underset((X))(P_(4)O_(10))):}`
`P_(4)O_(10)` ACTS as a dehydrating agent and removes `H_(2)O` from `HNO_(3)` to give `N_(2)O_(5)` (Y) and itself gets converted into `HPO_(3)` (Z).
Thus, X is `P_(4)O_(10)`, Y is `N_(2)O_(5)`, and Z in `HPO_(3)` and W is `O_(2)`.
`P_(4)O_(10)+4HNO_(3)rarr underset((Y))(2N_(2)O_(5))+underset((Z))(4HPO_(3))`
Discussion
16806.

Upon heating HClO_(3) in the presence of catalytic amount of MnO_(2), a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure HNO_(3) gives Y and Z. W and X are, respectively

Answer»

`O_(2) and P_(4)O_(6)`
`O_(2) and P_(4) O_(10)`
`O_(3) and P_(4)O_(6)`
`O_(3) and P_(4)O_(10)`

SOLUTION :`{:(2KClo_(3) overset(MnO_(2)"," Delta)rarr 2 KCl + underset((W))(3O_(2))),(P_(4)+10O_(2) overset("Oxidation")rarr underset((X))(P_(4)O_(10))):}`
`P_(4)O_(10)` acts as a dehydrating agent and removes `H_(2)O` from `HNO_(3)` to give `N_(2)O_(5)` (Y) and itself gets converted into `HPO_(3)` (Z).
Thus, X is `P_(4)O_(10)`, Y is `N_(2)O_(5)`, and Z in `HPO_(3)` and W is `O_(2)`.
`P_(4)O_(10)+4HNO_(3)rarr underset((Y))(2N_(2)O_(5))+underset((Z))(4HPO_(3))`
Discussion
16807.

When carbonylcompound react withnitrolkane . The reacitonproceding through

Answer»

carbocation
carbon FREE radical
carbene
carbanion

ANSWER :D
Discussion
16808.

Which C-atom is the most electronegative in this structure ? overset(III)(CH_(3))-overset(II)(CH_(2))-C= overset(I)(CH)

Answer»

I
II
III
all are equal electronegative

Solution :As the number of bonds between CARBON ATOMS increases, electronegativity of that carbon also increases DUE to increasing active power of electrons. Also sp hybrid is more electronegative than `sp^(2)` which is more electronegative than `sp^(3) (because ` s character decreases) Hence, option (a) is correct.
Discussion
16809.

Which of the following compound does not have hydrogen bonding :

Answer»

`K_(2)HPO_(4)`
`K_(2)HPO_(3)`
`NaHCO_(3)(s)`
`CH_(3)-underset(""O-H)underset(|)(C)=CH-OVERSET(O)overset(||)C-CH_(3)`

Answer :B
Discussion
16810.

What happens when acetic anhydride reacts with ethyl alcohol?

Answer»

SOLUTION :
Discussion
16811.

Which oxiacid of suphur contains S-Sbond in its structure?

Answer»

disulphurous acid
disulphuric acid
peroxydisulphuric acid
hydrosulphurous acid

SOLUTION :Disulphurous acid contains one S-S BOND in its STRUCUTRE
Discussion
16812.

Which of the following reacts with sodium with the elimination of hydrogen

Answer»

`CH_4`
`C_2H_6`
`C_2H_4`
`C_2H_2`

SOLUTION :`2CH-=CH+2Na to 2CH-= C^(-) NA^(+) +H_2`
Discussion
16813.

What type of substances would make better permanent magnets: ferromagnetic or ferrimagnetic ? Justify your answer.

Answer»

Solution :FERROMAGNETIC substanceswould make better PERMANENT magnets.
When ferromagnetic substances are placed in a magnetic FIELD, alignment of individual magnetic movementsof atoms or ions in the same direction will take place. This alignment remains as such even after REMOVAL of the external magnetic field.
Discussion
16814.

Which of the following is oxidised by KMnO_4

Answer»

Methane
Pentane
Isobutane
Neopentane

Solution :`(CH_3)_3 CHoverset(KMnO_4)to UNDERSET"TERTIARY BUTYL ALCOHOL"((CH_3)_3C-OH)`
Discussion
16815.

To what stable isotope would ""_(103)^(257)Lr decay?

Answer»

`""_(82)^(208)Pb`
`""_(83)^(209)Bi`
`""_(82)^(206)Pb`
`""_(82)^(207)Pb`

Solution :`""_(103)^(257)Lr` belongs to `(4n+1)` SERIES
Discussion
16816.

Which options is incorrect for K_(4)[Fe(CN)_(6)]:

Answer»

`CN^(-)` is ambidentate ligand
it has ionic and 5 coordinate bonds
its effective atomic NUMBER is 36
total number of `Pi-bonds` in this complexes is 12

Solution :`K_(4) [FE(CN)_(6)]` has C-N = 6
Discussion
16817.

The shape of XeF_6 is

Answer»

PENTAGONAL bipyramidal
SQUARE planar
OCTAHEDRAL
Distrorted octahedral

ANSWER :D
Discussion
16818.

Which of the following is most acidic

Answer»

`H_2O`
`CH_3-OH`
`C_2H_5-OH`
`C_3H_7-OH`

ANSWER :A
Discussion
16819.

Writethe Haworth.s structure of beta - D(+) maltose .

Answer»

SOLUTION :
Discussion
16820.

Which one of the following statement is not correct

Answer»

`._(6)^(14)C` is a non-radioactive isotope of carbon
`._(27)^(6)CO` is an unstable radioisotope of cobalt
`BF_(3)` is a LEWIS acid
`CN^(-)` is a very strong ligand

Answer :A
Discussion
16821.

What do you mean by primitive unit cell ?

Answer»

SOLUTION :When the constituent particles are present at the corner positions of a unit CELL, this is called PRIMITIVE unit cell.
Discussion
16822.

What happens when a carboxylic acid is treated with lithium aluminum hydride ?

Answer»

ALDEHYDE is formed.
Primary alcohol is formed.
KETONE is formed.
GRIGNARD reagent is formed.

Answer :B
Discussion
16823.

Transition element form binary compounds with halogens. Which of the following elements will form MF_(3) type compounds?

Answer»

Cr
Co
Cu
Ni

Solution :`CoF_(3)` is stabilized by high lattice enthalpy while `CrF_(6)` is stabilized by high BOND enthalpy
Discussion
16824.

What happens when the electric field is applied to colloidal solution ?

Answer»

SOLUTION :The colloidal particles carry CHARGE. When the ELECTRIC FIELD is applied, the colloidal particles move towards the oppositely charged plates. The process is KNOWN as electrophoresis.
Discussion
16825.

Which of the following is more acidic?

Answer»

`H_(4)P_(2)O_(5)`
`H_(4)P_(2)O_(6)`
`H_(4)P_(2)O_7`
`H_(3)P_(3)O_(9)`

ANSWER :C
Discussion
16826.

Which of the following has more Ka value ?

Answer»




ANSWER :C
Discussion
16827.

Total number of ligand(s) which forms five membered ring and also contains chiral centre(s). pn, en, tn, bn, DMG^(-1), acac^(-1), nta^(-3)

Answer»


SOLUTION :
Discussion
16828.

The strongest acid among the following is :

Answer»




ANSWER :D
Discussion
16829.

What is the mass in grams of : (i) 6.022xx10^(23) atoms of oxygen ? (ii) 1.0xx10^(23) molecules of H_(2)S? (iii) 6.022xx10^(23) molecules of oxygen? (iv) 1.5 moles of H_(2)SO_(4)?

Answer»

SOLUTION :(i) 16.0 G (II) 5.645 g (III) 32.0 g (IV) 147.0 g
Discussion
16830.

What are antiseptics?

Answer»

SOLUTION :Antiseptics are the chemicals which either kill or prevent the growth of microorganism. They are antimicrobial. Antiseptics are applied to living TISSUES such as wounds, cuts, ulcers and diseased skin surfaces. EXAMPLE are furacine, soframicine.
Discussion
16831.

Whichof thefollowing sets represent only elctrophiles-

Answer»

`BF_(3) , NH_(3) , H_(2)O`
`AICI_(3) , SO_(3) , overset(oplus)(N)O_(2)`
`overset(oplus)(N)O_(2)overset(oplus)(C)H_(3),CH_(3)overset(oplus)(C)O`
`C_(2)H_(3)^(Theta),overset(*)(C)_(2)H_(5),C_(2)H_(5)^(oplus)`

Answer :B::C
Discussion
16832.

What is packing efficiency in a crystal ? Draw the unit cell of a simple cubic lattice and calculate the packing efficiency in a simple cubic lattice.

Answer»

Solution :Packing EFFICIENCY it is a percentage of total space filled by the particles in a crystal.

Edge LENGTH or SIDE of a cube = a, radius of a particle = r
Particles touch each other along the edge
`therefore` a = 2r, volume of the CELL `= a^(3) = 8r^(3)`
Simple cubic unit cell contains only 1 atom
VOLUMNE occupied `= (4)/(3) pi r^(3)`
Packing efficiency `= ("Volumne of one atom")/("Volume of the unit cell") xx 100%`
`= ((4)/(3) pi r^(3))/(8r^(3)) xx 100 = 52.4%`
Discussion
16833.

Which elements are called platinum metals ?

Answer»

Solution :The elementsof the SECONDS and third TRIAD of Groups 8,9 and10 , i.e.,Ru, Rh, PD, Os, Ir and PT are called platinummetals.
Discussion
16834.

Which of the following is an exampleof nucleophilic addition reaction ?

Answer»

`CH-=CH + Cl_(2) to CHCL=CHCl`
`HC-=CH OVERSET(HCl)underset(CH_(3)COOH)to CH_(2)=CHCl`
`HC-=CH + H_(2)O underset(Hg^(2-), Delta)overset(H^(-))to CH_(3)-overset(O)overset(||)C-H`
`H-C-=C-H overset(NaNH_(2))to HC-=C^((-))Na^(o+)`

Answer :3
Discussion
16835.

Which statement is incorrect about peptide bond ?

Answer»

C-N BOND LENGTH in proteins is larger than USUAL bond length of C-N bond.
SPECTROSCOPIC analysis shows planar structure of `-CO-NH-`group.
`C-N` bond length in proteins is SMALLER than usual bond length of C-N bond.
None of the above.

Answer :A
Discussion
16836.

Which is general order of basicity for water and amines

Answer»

alkanamine `LT` arylamines `lt` WATER
alkanamines `GT` ARYL amines `gt` water
arylamines `gt` alkanamines `gt` water
arylamines `gt` water `gt` alkanamines.

Answer :B
Discussion
16837.

Whichone of thefollowingis notcorrect

Answer»

La`(OH)_(2)` is lessbasicthan`(OH)_(2)`
Inlanthaniod seriesionicradiusof `Ln^(3+)` ionsdecreases
La isactuallyelementof transitionmetalseriesratherthan LANTHANIDESERIES
ATOMICRADII of ZrandHfare samebecauseof LANTHANIDECONTRACTION .

ANSWER :A
Discussion
16838.

Which is the packing fraction in simple cubic unit cell ?

Answer»

`52.31%`
`100%`
`68%`
`75%`

ANSWER :A
Discussion
16839.

Which species is paramagnetic?

Answer»

`NO^(+)`
`CH_(3)^(-)`
CO
`O_(2)^(-)`

ANSWER :D
Discussion
16840.

What are main constituents of dettol ?

Answer»

SOLUTION :CHLOROXYLENOL and `ALPHA`-terpineol in a SUITABLE SOLVENT.
Discussion
16841.

Which are // is correct

Answer»

`R_(1)` CONTAIN `Ag^(+)` ion
`R_(1)` contain `Hg_(2)^(2+)` ino
`R_(1)` contain `Hg^(+2)`
`F_(1)` contain `Pb^(2+)` ion

Solution :
Discussion
16842.

Tyrosin contains

Answer»

ALCOHOLIC OH GROUP
phenolic OH group
ALDEHYDE group
ketonic group

Answer :B
Discussion
16843.

Which one is a thermosetting polymer ?

Answer»

POLYTHENE
PVC
BAKELITE
Polystyrene

Solution :Bakelite
Discussion
16844.

Which of the following compounds will show geometrical isomerism?

Answer»

2-Butene
PROPENE
1-Phenylpropene
2-Methyl-2-butene

ANSWER :A::C
Discussion
16845.

Which of the following is a reaction of first order ?

Answer»

`2N_2O_5 to 4NO_2 + O_2`
`2HI to H_2+I_2`
`2NO_2 to 2NO + O_2`
`2NO + O_2 to 2NO_2`

SOLUTION :For `2N_2O_5 to 4NO_2 + O_2,"RATE"= K [N_2O_5]`
Discussion
16846.

What happens when formaldehyde is treated with Sodium hydroxide solution ?

Answer»

SOLUTION :When FORMALDEHYDE is treated with sodium hydroxide solution, methyl alcohol and sodium FORMATE are produced.
`UNDERSET"(formaldehyde)"(2HCHO)+NaOHrarrunderset"(Sodium Formate)"(HCOONa+underset"(Methyl Alcohol)"(CH_3OH)`
Discussion
16847.

The structure of the major product 'B' is

Answer»




ANSWER :B
Discussion
16848.

Which one of the elements is most metallic

Answer»

P
As
Sb
Bi

Solution :The METALLIC property of an ELEMENT INCREASES from TOP to BOTTOM in group.
`PltAsltSbltBi`
Discussion
16849.

Which of the following is not correct for electronic distribution in the ground state?

Answer»

SOLUTION :Cu is `3D^(10)4s^(1)` and not `3d^(9) 4s^(2)`
Discussion
16850.

Which of the following is not acidic a-amino acid?

Answer»

Histidine
serine
glycine
proline

Answer :A
Discussion