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.

9151.

Which of the following diagrams is correctly related to different steps involved in the extraction of Sn form cassiterite Ore?

Answer»

FROTH floatation `RARR` Carbon reduction `rarr` Liquidation
Magnetic SEPERATION `rarr` Self reduction `rarr` Poling
magnetic Seperation` rarr` Carbon reduction `rarr` Poling and Liquidation
Laching `rarr` METAL displacement method `rarr` Vapour phase refing

Answer :3
Discussion
9152.

Which is/are concentration cells ?

Answer»

<P>pt , `H_2 // HCl // // HCl // H_2` , pt
Pt : `H_2 // UNDERSET((P^(H)=4))(HCl)// underset((P^(H)=2))(HCl)// H_2, Pt `
`Ag // underset((1M))(AgCl)// underset((1M))(AgBr)//Ag `
`Ag // underset((s))(AgCl), KCl // underset((1M))(AgNO_3)// Ag `

Solution :If 2 plates of same metal are dipped seperately into two solutions of same electrolyte and are connected with a salt bridge LIKE Gavanic cell called concentration cell.
Electrode concentration shell ` (Pt, H_2 (P_1))/("anode")|H^(+)|(H_2(P_2) Pt)/("cathode") , M(HgC_1)|M^(N+)|Zn(HgC_2)`
Electrolyte concentration cel `M|M^(n+) (C_1) ||M^(n+) (C_2) | M , (Zn|Zn^(+2)(C_1))/("anode")||(Zn^(+2)(C_2)|Zn)/("cathode")`
Discussion
9153.

The standard reduction potentials of 4 elements are given below. Which of the following will be the most suitable reducing agent. I=-3.04V,II=-1.90V,III=0V,IV=1.90V

Answer»

I
II
III
IV

Solution :LESS is the REDUCTION POTENTIAL stronger is the reducing AGENT.
Discussion
9154.

Which group is called buffer group of the periodic table ?

Answer»

I
VII
VIII
ZERO

Solution :Zero group is also called as buffer group because it is placed between highly ELECTROPOSITIVE METALS (group 1) and highly electronegative NON- metals (group 17)
Discussion
9155.

Two aldopentoses X and Y give the same osazone derivative. X is oxidized to an optically inactive aldaric acid by dilute nitric acid. Ruff degradation of Y gave a tetrose which was similarly oxidized to an optically active aldaric acid. Assign the structures of X and Y from the following list ?

Answer»

`X-1 & Y-4`
`X-4 & Y=1`
`X-2 & Y=3`
`X=3 & Y=2`

SOLUTION :
Discussion
9156.

Which of the following is soluble in sodium hydroxide

Answer»




SOLUTION :It is the SECOND step of Hinsberg's test which is given by `1^(@)` AMINES only.
Discussion
9157.

Which one is least sooluble is water ?

Answer»

`Ag_2S`
`AgCl`
`AgI`
`AgBr`

SOLUTION :Kspof `Ag_2S= 8 xx 10^(-51) , AgI = 8.5 xx 10^(-17)`
Discussion
9158.

Which of the following is known as alum ?

Answer»

`K_2SO_4. Al_2(SO_4)_3. 24H_2O`
`(NH_4)_2SO_4. FeSO_4. 6H_2O`
`(NH_4)FE(SO_4)_2. 12H_2O`
NONE of the above

Answer :A
Discussion
9159.

Which option(s) is/are incorrect.

Answer»




ANSWER :ABCD
Discussion
9160.

Which one of the following graphs represents the correct order of boiling points (B.P.) of ethane (1), ethyl alcohol (2) and acetic acid (3) ?

Answer»




ANSWER :C
Discussion
9161.

What do you understand by (a) inert pair effect(b) allotropyand (c) catenation?

Answer»

Solution :In going down a GROUP, RELUCTANCE of s-electrons to TAKE part in bond formation INCREASES. Hence, in heavier p-block elements, lower oxidation state BECOMES more stable.
Discussion
9162.

What is the chemical name of vitamin A and which disease is caused by its deficiency?

Answer»

SOLUTION :RETINOL, DEFICIENCY DISEASE : XEROPHTHALMIA.
Discussion
9163.

Which one of the following has a magnetic moment of 1.75 B.M ?

Answer»

`Ti^(3+)`
`V^(3+)`
`Cr^(3+)`
`FE^(3+)`

Solution :MAGNETIC MOMENT `(MU) = sqrt(n (n +2))` B.M. where n = number of unpaired electrons .
Discussion
9164.

Which of the following reactions will take place at the cathode during the electrolysis of an aqueous solution of sodium chloride ?

Answer»

`Na^(+) +E^(-) to Na`
`Cl^(-) -e^(-) to Cl`
`2H^(+) +2e^(-) to H_(2)`
`2H^(-) - 2e^(-) to H_(2)`

Solution :Aqueous solution of NaCl contains `H^(+)` and `Na^(+)` CATIONS. `H^(+)` cations will preferentially migrate as compared to `Na^(+)` DUE to high reduction POTENTIAL.
Discussion
9165.

What is a broad spectrum antibiotic? Name a broad spectrum antibiotic and source organism.

Answer»

SOLUTION :Broad SPECTRUM Antibiotic : Antibiotics which kill or inhibit a wide range of gram POSITIVE and gram negative bacteria. e.g., chloramphenicol, ofloxacin ETC.
Discussion
9166.

The total No. of possible isomers of the compound [Cu^(II) (NH_(3))_(4)][Pt^(II) Cl_(4)] are :-

Answer»

3
5
4
6

Answer :C
Discussion
9167.

What is colligative properties ? Explain.

Answer»

Solution :The vapour pressure of solution decreases when a non - volatile solute is added to a volatile solvent. There are many properties of SOLUTIONS which are connected with this decrease of vapour pressure. These are :
(i) Relative lowering of vapour pressure of the solvent.
(II) DEPRESSION of freezing point of the solvent.
(iii) Elevation of boiling point of the solvent and
(iv) Osmotic pressure of the solution.
All these properties depend on the number of solute particles IRRESPECTIVE of their nature relative to the TOTAL number of particles present in the solution. Such proiperties are called colligative properties.
Discussion
9168.

Which of the following is a common example of fibres?

Answer»

Bakelite
Buna-`S`
NYLON-`6,6`
Nylon-`6`

ANSWER :C
Discussion
9169.

When a solution of AgNO_3 added to pure C Cl_4 :

Answer»

A PALE YELLOW PRECIPITATE is formed
Curdy WHITE precipitate is formed
No precipitate is formed
None

Answer :C
Discussion
9170.

Which of the following is the correct order of decreasing reactivity towards nucleophilic substitution reaction ?

Answer»

n-Propyl CHLORIDE `gt ` Allyl chloride ` gt ` Vinyl chloride
Allyl chloride ` gt ` n- Propyl chloride` gt ` Vinyl chloride
Vinyl chloride ` gt` Allyl chloride ` gt` n- propyl chloride
Vinyl chloride `gt ` Allyl chloride ` gt ` n- Propyl chloride

ANSWER :B
Discussion
9171.

The strongest Lewis base in the following

Answer»

`CH_(3)^(-)`
`F^(-)`
`NH_(2)^(-)`
`OH^(-)`

Solution :`CH_(4)` has ALMOST no ACIDIC NATURE and thus `CH_(3)^(-)` is strongest base.
Discussion
9172.

The solution of which one of the following will have pH less than ?

Answer»

NaOH
KCI
`FeCI_(3)`
NaCI

Solution :`FeCI_(3)` is an acid salt because FE `(OH)_(3)` is weak base and HCI is a stong acid PH is les than 7
Discussion
9173.

Which of the following can possibly be used as analgesic without caousing addiction and modification?

Answer»

Morphine
N- Acetyl-para-amino PHENOL
Diazepam
Tetrahydrocatenol

Solution :N-Acetyl-para-amino phenol i.e., paracetamol ACTS as both ANALGESIC as well as antipyretic.
Discussion
9174.

Which of the following give effervesence with NaHCO_3 :-

Answer»

p-cresol
PHENOL
2,4-Dinitrophenol
TOLUENE

ANSWER :C
Discussion
9175.

To solublize nobel metals like gold, platinum ..........mixture is used.

Answer»

1:3 CONCENTRATED HCL and concentrated `HNO_3`
1:3 concentrated `HNO_3` and concentrated HCl
1:3 concentrated `HNO_3` and concentrated `H_2SO_4`
1: 3 concentrated `H_2SO_4` and concentrated HCl

Answer :B
Discussion
9176.

What is the role of depressant in froth floatation process ?

Answer»

Solution :Principle : The process is based on the difference in wetting properties of ore and impurities in presence of water and frothing agent. The following components are chosen for the process :
(i) Frothers : These substances create froth.
Ex. : Pine oil, Turpentine oil etc.
(ii) Collectors : Collectors helps in adhesion of ore particles to air bubbles in froth.
For example : Sodiumethyl Xanthates
(iii) Froth stabilizers : These substances stabilizes the froth.
For example : Aniline, cresol etc.
(iv) Depressants : These substances prevent the FORMATION of froth with air bubbles.
For example : NaCN (sodium CYANIDE)
In this process, a suspension of the powdered ore is made with water. The mineral particles become WET by oils while gangue particles by water. A rotating paddle agitates the mixture and draws air in it, as a result froth is formed which carries mineral particles. The froth is LIGHT and skimmed off. It is then dried for recovery of ore particles.
Role of depressants : Some times, it is possible to seperate two sulphide ores by adjusting proportion of oil to water or by adding depressants. For example, in the case of an ore containing ZnS and PBS, the depressants used is `NaCN. NaCN` forms a layer of zinc complex `Na_2[Zn(CN)_4]` on the surface of Zns thereby prevents it from the froth formation and allows PbS to come with the froth.
The sulphide ores being lighter and get wetted easily by oils come on the surface leaving behind gangue. Hence, this method is used for concentration of sulphide ores.
Discussion
9177.

Whatweight of oxygen will react with 1 g of calcium ? (Ca = 40)

Answer»

Solution :First Method
Since all the atoms of Ca have CHANGED into CaO,the amount of Ca in CaO is 1 g. Nowfromthe formula of CaO , we have ,
moles of Ca = moles of O(Rule 6)
Now , `(wt. of Ca)/( at. wt. of Ca ) = (wt . of O)/( at. wt. of O) `
`:.` Wt. of oxygen `= (1)/(40) xx 16 = 0 . 4 `g .
second Method
`Ca + O_(2) to CaO` (BALANCING of the equation is not REQUIRED)
1 g x g (say)
Applying POAC forCa atoms,
molesof Ca in the reactant = moles of Ca in CaO
`(1)/(40) ` (Rule 2)`= 1 xx ` moles of CaO
(`:.` 1 mole of CoOcontains 1 mole of Ca atom )
`:. ` moles of CaO `= (1)/(40) "". . . (1) `
Againapplying POAC foroxygen atoms,
Moles of O in `O_(2)` = moles of O inCaO
`2xx`moles of `O_(2) = 1 xx`moles of CaO. . . (2)
(`:.` 1 moles `O_(2)` contains 2 moles of O and 1 mole of CaO contains 1moleof O).
From eqns (1) and (2) , eliminating moles of CaO, we have
moles of `O_(2) = (1)/( 2 xx 40 ) = (1)/(80) , "or " (wt. of O_(2))/( 32) = (1)/(80)""` (Rule 1 )
`:.` wt . of `O_(2) = (1)/(8) xx 32 =0 . 4 g `
[Note : The chemical equation of the above given problem is simple, i.e., easy to balance. Butin complicated reactions (Ex. s, 6, etc.) where the balancingis notvery easy , the studentcan applyPOAC withoutbalancingthe equation . Thisis where the mole methodhas its importance ]
Discussion
9178.

The term sorption stands for……….

Answer»

ABSORPTION
ADSORPTION
both absorption and adsorption
DESORPTION

ANSWER :C
Discussion
9179.

Which of the following on hydrolysis forms acetic acid

Answer»

`CH_(3)` CN
`CH_(3) `OH
`C_(2)H_(5)`OH
`C_(2)H_(5) NH_(2)`

Solution :Cyanides on ACID hydrolysis FORM carboxylic acids
Discussion
9180.

Which of the following is not planar in structure?

Answer»

`CH_2=CH-CH=CH_2`
`CH_2=CH-CN`
`CH_2=C=CH_2`
`CH_2=C=C=CH_2`

ANSWER :C
Discussion
9181.

Treatment of ammonia with excess of ethyl chloride will yield:

Answer»

DIETHYL amine
Ethane
Tertraethyl AMMONIUM chloride
Methyl amine

Answer :C
Discussion
9182.

Which of the following has the highest degree of ionisation ?

Answer»

1 M `NH_3`
`0.001 M NH_3`
`0.1 M NH_3`
`0.0001 M NH_3`

ANSWER :d
Discussion
9183.

What aretransitionmetalsGivefourexamples.

Answer»

SOLUTION :IUPACdefinestranstionmetalas anelementwhoseatomhas an incompleted shellor whichcan giverise to CATIONS withan incompleted SUBSHELL.
Ex . FE, Cu, Ni and CO
Discussion
9184.

When CuSO_4 is mixed with excess of NH_3, a deep blue coloured solution is obtained.What is the IUPAC name of the compound.

Answer»

SOLUTION :TETRA ammine Copper(II)HYDROXIDE
Discussion
9185.

Which is the set of non stoichiometric compounds

Answer»

`NACL, FEO, MgCl_(2)`
`Fe_(3), O_(4), NaCl, CuS`
`Fe_(3)H, TIC, VH`
`CuCL, CuS, MGO`

Answer :C
Discussion
9186.

Total stereoisomers of [Cu(gly)_(2)(OH_(2))_(2)] are :

Answer»


SOLUTION :`(2 "TRANS"-N,O, "trans" N_(2),O_(2))/("Op. inactive")`
trans `O_(2)` and cis `N_(2) to "enatiomer"`
trans `N_(2)` cis `O_(2) to "enantiomer"`
trans N,O and cis `O_(2)`, cis `N_(2) to "enantiomer"`
Discussion
9187.

What is an elementary reaction ? Given the differences between order and molecularity of a reaction .

Answer»

SOLUTION :Elementary REACTION : Each and every and every single step in a reaction MECHANISM is CALLED an elementary reaction.
Discussion
9188.

Type of hyridization in transition state of SeF_4, when it undergoes in hydrolysis is :

Answer»

`sp^3d`
`sp^3d^2`
`dsp^3`
`sp^3`

ANSWER :B
Discussion
9189.

Which product obtained when diethyl ether is heated with Conc. HI ?

Answer»

Ethanol
Methyl iodied
Iodine
ETHYL IODIDE

Solution :Ethyl iodide
Discussion
9190.

Though H_(2) is a good reducing agent why is it not used as a reductant in metallurgy?

Answer»

Solution :When `H_(2)` is used in the reduction of a metallic oxide, itself gets oxidised to `H_(2)O`. Change from gaseous to liquid state decreases `DeltaS`:
`MO(s)+H_(2)(G)rarrM(s)+H_(2)O(l)`
`therefore""Deltas=-ve and DELTAG` becomes less `-ve` (increases).
So, thermodynamic feasibility of the reaction decreases.
Absorption of `H_(2)` to form a METAL HYDRIDE also decreases its tendency to reduce metal oxides and so not used in metallurgy.
Discussion
9191.

Which of the following factors may be regarded as the main cause of lanthanoide contraction?

Answer»

Greater shielding of 5d ELECTRONS by 4F electrons
POORER shielding of5d electrons by 4felectrons
Effective sb ielding of one of 4f electrons by ANOTHER in the subshell
Poor shielding of one of 4felectron by another in the subshell

Solution :In lanthanides, there is poorer shielding of 5d electrons by 4f electrons resulting in greater attraction of the NUCLEUS over 5 d electrons and contraction of the atomic radii.
Discussion
9192.

Which of the following pairs of species would you expect to have largest difference in spin only magnetic moment ?

Answer»

`O_(2), O_(2)^(+)`
`O_(2)O_(2)^(2-)`
`O_(2)^(+), O_(2)^(2-)`
`O_(2)^(-),O_(2)^(+)`

Solution :`{:("SPECIES","No. of UNPAIRED"),(O_(2),2),(O_(2)^(+),1),(O_(2)^(-),1),(O_(2)^(-2),0):}` `
Discussion
9193.

Write the mechanism of the following reaction : nBuBr + KCN overset(EtOH - H_(2)O) to nBuCN

Answer»

Solution :KCN is a resonance hybrid of the following two contributing structures :

Thus , `CN^(-) ` ION is an ambident nucleophile . Therefore , it can attack the carbon atom of C - Br bond in n -BUBR either through C or N .SINCE C -C bond is stronger than C - N bond, therefore, attack occurs through C to FORM n- butyl CYANIDE
Discussion
9194.

Two electrolytic cells containing molten solutions of Nickel chloride and Aluminium chloride are connected in series.If same amount of electric current is passed through them, what will be the weight of Nickel obtained when 18 gm of Aluminium is obtained ? (Al-27" gm"//"mole", Ni-58.5" gm"//"mole"^(-1))

Answer»

58.5 g
29.25 g
117 g
5.85 g

Solution :(a) According to FARADY's SECOND law of electrolysis
`("Mass of Ni DEPOSITED")/("Mass of Al deposited")=("Equivalent mass of Ni")/("Equivalent mass of Al")`
`=((58.5//2 g " EQUIV"^(-1)))/((27.0//3 g "equiv"^(-1)))`
Mass of Ni deposited `=((18 g)XX(29.25))/((9.0))=58.5 g`
Discussion
9195.

What are covalent solids ? Give example.

Answer»

Solution :In covalent SOLIDS, the constituents (ATOMS) are BOUND together in a three dimensional network entirely by covalent bonds. EXAMPLES. Diamond, Silicon CARBIDE.
Discussion
9196.

Total number of acyclic isomers including stereoisomers of AlCl_3 find product is

Answer»

9
10
12
13

Solution :Total NUMBER of ACYCLIC ISOMERS INCLUDING sterisomers of `C_4H_7Cl and 12`.
Discussion
9197.

Which of the following compound posses plane of symmetry ?

Answer»




ANSWER :C
Discussion
9198.

Which of the following is correct for structures A, B and C ?

Answer»

(B) and (C ) are IDENTICAL
(A) and (B) are DIASTEREOMERS
(A) and (C ) are enantiomers
(A) and (B) are enantiomers

ANSWER :B
Discussion
9199.

Which of the following given statements is/are correct? (a) cold cream is an example of (W/O) type emulsions, (b)electrical conductance of aqueous emulsions is less than that of oil emulsions (c) emulsions cannot be broken into constituent liquids by heating or freezing (d) an emulsion can be diluted with water, then it forms (O/W) type emulsion

Answer»

(a) and (d)
only (a)
(a), (B) & (C)
(a) ,(c) & (d)

ANSWER :A
Discussion
9200.

Which of the followingfluoro- compoundsis mostlikely to behaveas a Lewisbase ?

Answer»

` BF_(3)`
` PF_(3)`
`CF_(4)`
`SiF_(4)`

Answer :B
Discussion