Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

13051.

Which of the following will get oxidised by Be_(2)//Koh into carboxylic acid ?

Answer»

`CH_(3)-CH_(2)-OH`


SOLUTION :N//A
Discussion
13052.

The structural formula of the compound which yields eth- ylene upon reaction with zinc is:

Answer»

`CH_(2)"Br"-CH_(2)` Br
`"CHBr_(2)-CHBr_(2)`
`CH_(3)CH_(2)Br`
none of these

Answer :A
Discussion
13053.

The solvent used in the conversion of alcohol to alkyl halide through SOCl_(2) is _______.

Answer»

pyridine
ether
chloroform
benzene

Answer :A
Discussion
13054.

White phosphorous is heated with excess of dry chlorine to get X. X on hydrolysis finally forms an oxoacid of phosphorous Y. What are X and Y? What is the basicity of the acid ?

Answer»

Solution :X is `PCl_(5)`
Y is `H_(3)PO_(4)`
Basicity of Y is 3.
Discussion
13055.

Which of the following complex is incorrectly matched against their indicated properties ?

Answer»

`{:([Co(en)_(3)][Cr(CN)_(6)]and),([Co(en)_(3)][Cr(CN)_(6)]):}}" Co-ordination isomers "`
`{:([Co(PY)_(2)(H_(2)O)Cl_(2)]and),([Co(py)_(2)(H_(2)O)_(2)Cl_(3)].H_(2)O):}}" Ionisation isomers "`
`CrCl_(3)(H_(2)O)_(6)-" Do not show G.I and O.I. "`
`Co(en)_(2)Cl_(2)NO_(2)-" Can show Ionisation isomerism "`

Answer :B
Discussion
13056.

What happens when aniline is heated with chloroform and alcoholic potash ? write equation. OR Explain carbylamine reaction for a primary amine. Write general equation

Answer»

SOLUTION :
Discussion
13057.

The solubility product of a salt having general formula MX_(2) in water is 4xx10^(-12). The concentration of M^(2+) ions in the aqueous solution of the salt is:

Answer»

`2.0 XX 10^(-6) M`
`1.0 xx 10^(-4) M`
`1.6 xx 10^(-4) M`
`4.0 xx 10^(-10) M`

SOLUTION :`{:(MX_(2)HARR,M^(2+),+,2X^(-)),(,S,,2S):}`
`RARR S = 3sqrt((K_(sp))/(4)) = 3sqrt((4 xx 10^(-12))/(4)) = 1.0 xx 10^(-4) M`.
Discussion
13058.

Which oxide of N is neutral ?

Answer»

`N_2O_3`
`N_2O_5`
`N_2O_4`
`N_2O`

ANSWER :D
Discussion
13059.

Which of the following is the most stable complex ?

Answer»

`[FE(H_(2)O)_(6)]^(3+)`
`[Fe(NH_(3))_(6)]^(3+)`
`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[FeCl_(6)]^(3-)`

ANSWER :C
Discussion
13060.

Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?

Answer»

Solution :A solution of NaCN or KCN in the presence of AIR is used for leaching of SILVER METAL.
Discussion
13061.

Which of the following metal can be extracted without using reducing agent?

Answer»

Sn
Pb
Fe
Both (1) & (2)

ANSWER :B
Discussion
13062.

Write Nernst equation for the reaction (i) 2Cr(s)+3Cd^(+ +)(aq)to2Cr^(3+)(aq)+3Cd(s)(ii) 2Cr+3Fe^(+ +)to2Cr^(3+)+3Fe

Answer»

SOLUTION :(i) `E_(CELL)=E_(cell)^(@)-(RT)/(6F)ln([Cr^(3+)]^(2))/([Cd^(++)]^(3))(becausen=6)""(II) " "E_(cell)=E_(cell)^(@)-(RT)/(6F)"ln"([Cr^(3+)]^(2))/([Fe^(++)]^(3))(becausen=6)`
Discussion
13063.

Which of the following represents the given mode of hybridisation : sp^(2)-sp^(2)-sp-sp from left to right ?

Answer»

`H_(2)C=CH-C-=N`
`HC-=C-C-=CH`
`H_(2)C=C=C=CH_(2)`

ANSWER :A
Discussion
13064.

Which of the following gives yellow ppt. with H_2PtCl_6 ?

Answer»

AMMOINA
`CO_2`
`Cl_2`
`CO`

ANSWER :A
Discussion
13065.

What will be the passenger carrying capacity of a balloon of diameter 20 m and mass 100 kg filled with helium at 1.0 atm at 27^(@)C. Density of air is 1.2 "kg"//m^(3) and average weight of a passenger is 65 kg.

Answer»

55
60
65
70

Solution :Volume of AIR displaced by balloon = volume of balloon
= `(4)/(3) pi r^(3)= (4)/(3) xx (22)/(7) xx 10^(3)=4190.47 m^(3) or 4190.47 xx 10^(3) L`
`"Mass of air displaced by balloon" = 4190.47 xx 1.2 = 5028.56 g`.
Number of moles of He in balloon, `n = (PV)/(RT) = (1 xx4190.47 xx 10^(3))/( 0.082 xx 300)= 170344`
`"Mass of filled balloon" = 681.376 + 100 = 781.376 g`. 
`"Pay load of balloon" = "mass of air displaced" – "mass of filled balloon" = 5028.56 - 781.376 = 4247.184 g`
`"Passenger carrying capacity" = ("Payload")/("Average wt.of Passenger")= 4247.184 65 = 65.3 = 65 "Passengers"`.
Discussion
13066.

How will you carry out the conversion Toluene to benzyl alcohol

Answer»

SOLUTION :
Discussion
13067.

What happens when the following alkenes are subjected to reductive ozonolysis (i) propene (ii) 1 – Butene (iii) Isobutylene

Answer»

SOLUTION :
Discussion
13068.

Which of the following is not an alloy of copper?

Answer»

bronze
type metal
gun metal
brass

Answer :B
Discussion
13069.

Which of the following alkenes is most stable-

Answer»

`(CH_(3))_(2)C=C(CH_(3))_(2)`
`(CH_(3))_(2)C=CHCH_(2)CH_(3)`
`CH_(3)CH_(2)CH=CHCH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)CH_(2)=CH_(2)`

ANSWER :A
Discussion
13070.

Which of the following compounds is used in anti - knock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe?

Answer»

Benzene
Glycol
1, 2-Dibromoethane
Glycerol

Answer :C
Discussion
13071.

Which has the maximum lattice energy ?

Answer»

RbF
CsF
NaF
KF

Answer :C
Discussion
13072.

Which of the following paths is/are feasible for the preparation of ether (A) ?

Answer»




SOLUTION :NA
Discussion
13073.

Write structures of the compounds whose IUPAC names are as follows : {:("(i) 2-Methylbutan-2-ol","(ii) 1-Phenylpropan-2-ol"),("(iii) 3, 5-Dimethylhexane-1, 3, 5- triol","(iv) 2, 3 - Diethylphenol"),("(v) 1-Ethoxypropane","(vi) 2-Ethoxy-3- methylpentane"),("(vii) Cyclohexylmethanol","(viii) 3- Cyclohexylpentan-3-ol"),("(ix) Cyclopent-3-en-1-ol","(x) 3-Chloromethylpentan-1-ol."):}

Answer»

SOLUTION :
Discussion
13074.

The smallest repeating pattern which when repeated again and again results in the crystal of substance is called

Answer»

SPACE lattcie
crystal system
unit cell
coordination NUMBER.

ANSWER :A
Discussion
13075.

The strongest Bronsted base is :

Answer»

`ClO_(3)^(-)`
`ClO_(2)^(-)`
`ClO_(4)^(-)`
`CLO^(-)`

Solution :Strongest BRONSTED base has weakest CONJUGATE acdi. `:.HOCl` is weakest acid AMONG `HOCl, HClO_(2),HClO_(3)` and `HClO_(4)`.
`:.` Conjugate base HOCl (i.e. `Ocl^(-)`) is strongest Bronsted base.
Discussion
13076.

Which of the following does not make any change in pH when added to 10 mL dilute HCl

Answer»

5 ML pure water
20 ml pure water
10 ml HCl
Same 20 ml dilute HCl

Solution :Buffer solution is formed. So the PH will not change.
Discussion
13077.

Which of the following is/are inner orbital complex as well as paramagnetic with magnetic moment equal to 3.78 (approx) ?

Answer»

`[Co(O X)_(3)]^(3-)`
`[Cr(NH_(3))_(6)]^(3+)`
`[Fe(H_(2)O)_(5)NO]^(2+)`
`[Zn(NH_(3))_(6)]^(2+)`

Solution :`Cr^(+3)=3d^(3)`

`d^(2)sp^(3), mu_(M)=3.78B.M.`
Discussion
13078.

The total spin resulting from a d^(7) configuration is

Answer»

`3//2`
`1//2`
`2`
`1`

Solution :`v=1/100xx3.0xx10^(8)ms^(-1)=3.0xx10^(6)ms^(-1)`
`lamda=h/(mv)=(6.6xx10^(-34))/(9.0x10^(-31)xx3.0xx10^(6))`
`=2.44xx10^(-10)m` or `=244"pm"`
Discussion
13079.

Write ionic equations for the reaction of dichromate ions with (i) hydroxyl ions, (ii) Fe^(+2)ions in acidic medium In which one of the above two reactions will the oxidation number of chromium remains unchanged ?

Answer»

SOLUTION :(i) `CrO_(7)^(2-) + 2OH^(-) to 2CrO_(4)^(2-) + H_2O`
(ii) `Cr_2O_(7)^(2-) + 14H^(+) + 6FE^(2+) to 2Cr^(3+) + 6Fe^(3+) + 7H_2O`. In reaction (i)
Discussion
13080.

Which of the following is an artificial man-made series?

Answer»

Thorlum series
Neptunium series
Uranium series
Actinium series.

Answer :B
Discussion
13081.

Two elements X and Y have atomic masses 14 and 16 respectively. They can form a series of five compounds A, B, C, D and E in which for the same amount of X, Y is present in the ratio of 1:2:3:4:5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then compound C will have 24 parts by weight of Y combined with

Answer»

28 PARTS by weight of X
14 parts by weight of X
8 parts by weight of X
4.1 parts by weight of X

SOLUTION :Ratio of X and Y in compound A is 1:1:
Ratio of X and Y in compound C is 1:3
Now if in compound A, 28 parts bywt. of X combine with 16 parts by wt. of Y then in compound C, 28 parts of X will combine with `16 XX 3= 48 ` parts of Y
` THEREFORE ` 24 parts of Y will combine with 14 parts of X in compound C .
Discussion
13082.

Write the reaction that takes place on adding lime to water containing magnesium bicarbonate.

Answer»

SOLUTION :`MG(HCO_3)_2 + 2CA(OH)_2 to 2CaCO_3 + Mg(OH)_2darr + 2H_2O `
Discussion
13083.

Y g of non-volatile organic substance of molecular mass M is dissolved in 250 g benzene. Molal elevation constant of benzene is K_(b). Elevation in its boiling point is given by:s

Answer»

`M/(K_(B)Y)`
`(4K_(b)Y)/M`
`(K_(b)Y)/(4M)`
`(K_(b)Y)/M`

Solution :`DeltaT_(b)=K_(b)xx(W_(B)xx1000)/(M_(B)xxW_(A))`
`=K_(b)xx((Y_(g))xx(1000 g ))/(Mxx(250G ))`
`(K_(b)xxYxx4)/M=(4K_(b)y)/M`
Discussion
13084.

Which of the following cannot be prepared by Rosenmund reduction method?

Answer»

ACETALDEHYDE
FORMALDEHYDE
KETONE
Both B & c

Solution :FormaldehydeandKetone
Discussion
13085.

Which of the following elements can be involved in p_(pi)-d_(pi)bonding?

Answer»

CARBON
Nitrogen
Phosphorus
Boron

SOLUTION :Phosphorus can form `p PI - d pi` BONDS due to the presence of 3d-orbitals.
Discussion
13086.

What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?

Answer»

Polling
Pyrometallurgy
HYDROMETALLURGY
CALCINATION

ANSWER :B
Discussion
13087.

What is tincture of iodine ? What is its use?

Answer»

SOLUTION :2-3 per cent solution of iodine in alcohol water MIXTURE is KNOWN as TINCTURE of iodine.
It is APPLIED on wounds.
Discussion
13088.

Which of the following will give blood red colour with FeCl_(3)in sodium extract (Lassaigne'sextract).

Answer»

`NH_(3)CONH_(2)`
`NH_(2)CSNH_(2)`and `PhCH_(2)Cl`
`C_(6)H_(5)NHNH_(2)`
`CH_(3)C = N`

Solution :(b) is CORRECT answer because it contain N and S. therefore ITWILL form `NaSCN` which reacts with `FeCl_(3)` togive FERRIC thioyanate, which is blood red in colour. (a), (c ) and (d) are not possible because they do not contain sulphur.
Discussion
13089.

Which of the following statements regarding the metallurgy of magnesium using electrolytic method is not correct

Answer»

Electrolyte is magnesium CHLORIDE containing a little of NACL and NaF
Air tight iron pot acts as a cathode
Electrolysis is not DONE in the atmosphere of coal gas
Molten magnisium is heavier than the electrolyte

Solution :For the metallurgy of Mg, Electrolysis is done in the atmosphere of coal gas, molten Mg is lighter than electrolyte.
Discussion
13090.

Which one of the following is used as fuel for aeroplane?

Answer»

Methanol + ETHANOL
Ethanol + PETROL
Ethanol + Propanol
BUTANOL +Methanol

Solution :Ethanol + Petrol
Discussion
13091.

The solubility of AgCl in water at 10^@C is 6.2 xx 10^-6 mol/litre. The K_sp of AgCl is:

Answer»

`[6.2XX10^(-6)]^1/2`
`6.2xx10^(-6)^2`
`(6.2)^2xx10^(-6)`
`[6.2xx10^(-6)]^2`

ANSWER :D
Discussion
13092.

The solubility product of Mg(OH)_(2)may be written as :

Answer»

`[MG^(2+)][OH^(-)]`
`[Mg^(2+)][OH^(-)]^(2)`
`[Mg^(2+)][2OH^(-)]`
`[Mg^(2+)//2][OH^(-)]`

ANSWER :B
Discussion
13093.

Which of the following statement(s) is /are correct?

Answer»

Magnestic is the ORE of magnesium
A MINERAL containing ZnS and PbS TOGETHER is SEPARATED in fronth floatation process by adding NaCN as depressant.
Which bauxite is purified by Hall's process.
Extraction of zinc from zinc blende is possible by self reduction.

Answer :A::B
Discussion
13094.

Which molecule does not exist ?

Answer»

`MnF_(4)`
`SH_(6)`
`(BCl_(3))_(2)`
2 & 3 both

Answer :D
Discussion
13095.

Tin, a silvery white metal exists in :

Answer»

FOUR ALLOTROPIC forms
Three allotropic forms
Five allotropic forms
Two allotropic forms

Answer :B
Discussion
13096.

What is adsorption? What is meant by positive and negative adsorption?

Answer»

Solution :Adsorption is the odhesion of atoms, ions or MOLECULES from a gas, LIQUID or dissolved solid to a surface.
In adsorption, if the concentration of a substance in the interface is HIGH, then it is CALLED positive adsorption. If it is less, then it is called negative adsorption.
Discussion
13097.

What ids the resultant ph of solution of mixing 200 ml of an aqueous solution of HCl (ph=2.0) is mixed with 300 ml of an aqueous solution of NaOH (PH=12)?

Answer»

11.031
11.301
10
None

Answer :A
Discussion
13098.

Which one of the following vitamin deficiency leads to Rickets?

Answer»

VITAMIN A
Vitamin `B_(1)`
Vitamin C
Vitamin D

Answer :D
Discussion
13099.

What is C ?

Answer»

`CH_(3) - CH_(3)`


`CH_2=CH_2`

ANSWER :A
Discussion
13100.

Which will increase the voltage of the cell Sn_((s))+2Ag_((aq))^(+)toSn_((aq))^(2+)+2Ag_((s))

Answer»

Increase in the concentration of `AG^(+)` ion
Increase in the concentration of `SN^(2+)` ions
Increase in size of the silver ROD NONE of these
None of these

Solution :`E_(cell)=E_(cell)^(o)+(0.059)/(2)log((Ag^(+)))/((Sn^(2+)))`.
Discussion