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.

18501.

What is "sulpha drugs" ?

Answer»

Solution :These are SYNTHETIC CHEMOTHERAPEUTIC AGENTS having SULPHONAMIDE GROUP in their structure .
Discussion
18502.

Which of the following will be most redily dehydrated in acidic conditions ?

Answer»




ANSWER :A
Discussion
18503.

What is a secondary cell? Write the equation for the cathodic reaction of lead storage battery ?

Answer»

Solution :The cell which can be recharged by PASSING current in opposite direction and can be USED again.
Cathodic reaction is `PbO_(2(s))+SO_(4(aq))^(2-)+H_((aq))^(+)+2E^(-)RARR PbSO_(4(S))+2H_(2)O_((l))`
Discussion
18504.

Which is not aldose ?

Answer»

GLUCOSE
RIBOSE
FRUCTOSE
Menose

SOLUTION :Fructose
Discussion
18505.

Which reaction is possible

Answer»

`I_2+2NaBrrarrBr_2+2NaI`
`I_2+2NaClrarrCl_2+2NaI`
`Br_2+2NaClrarrCl_2+2NaBr`
`Cl_2+2NaBrrarrBr_2+2NaCl`

ANSWER :D
Discussion
18506.

Which among the following gives nitrogen on heating:

Answer»

`NaNO_3`
`AgNO_3`
`BA(NO_3)_2`
`NH_4NO_2`

ANSWER :D
Discussion
18507.

What is the name given to higher members of aliphatic carboxylic acids ?

Answer»

SOLUTION :FATTY ACIDS
Discussion
18508.

Which of the following is simple lipids ?

Answer»

FAT SOLUBLE vitamins
prostaglandins
anomer of D-glucose
both a and b

Answer :D
Discussion
18509.

Which one of the following represents the electronic configuration of the most electropositive elements?

Answer»

`[He] 2S^(1)`
`[Xe] 6s^1`
`[He] 2s^2`
`[AR] 4s^2`

Answer :B
Discussion
18510.

Which of the following will not show optical isomerism.

Answer»

`C1- CH= C=C=CH-C1`
`C1-CH=C=C=C=CH -C1`

ANSWER :A
Discussion
18511.

What is Raoult's law ? How can molar mass of non-volatile solute be determined with its helo ?

Answer»

SOLUTION :For ANSWER CONSULT SECTION 9.
Discussion
18512.

Which of the following reactions do not involve oxidation reduction ? I. 2Cs+2H_(2)Orarr2CsOH+H_(2) II. 2CuI_(2)rarr2CuI+I_(2) III. NH_(4)Br+KOHrarrKBr+NH_(3)+H_(2)O IV. 4KCN+Fe(CN)_(2)rarrK_(4)[Fe(CN)_(6)]

Answer»

l, II
I,III
l,LLL,IV
lll,IV

Solution :(d) I. `CS rarr Cs^(1+) + e^(-)` (Oxidation)
`H_2O + e^(-) rarr OVERLINE(O)H +1/2H_2`(Reduction)
Hence, redox REACTION.
II. `e^(-) + Cu^(2+) rarr Cu^(1+)` (Reduction)
`2I^(-) rarr l_2 +2e^(-)` (Oxidation)
Hence, redox reaction.
II. `N overset(+)(H)_4 rarr NH_3` (No change in oxidation number)
Hence, reaction is not a redox reaction.
IV. No change in the oxidation number of either `Fe_(2+)` or `CN^(-)` in both reactant and PRODUCT, hence, reaction is not a redox reaction.
Discussion
18513.

Which of the following will not form ether ?

Answer»

`R-X + C_6H_5ONa to`
`R-X OVERSET(moist Ag_2O)to`
`R-X + R -O Na to`
`CH_2N_2 + R -OH overset(HBF_3)to`

ANSWER :B
Discussion
18514.

There is a salt of weak acid and weak base the K_(a) of the acid is greater than the K_(b) of the base hence

Answer»

Degree of HYDROLYSIS is independent of the concentration of the salt solution
Anionic hydrolysis will be GREATER than cationic hydrolysis
Cationic hydrolysis is greater than anionic hydrolysis
`h = sqrt((K_(w))/(K_(a)K_(B)))`

Solution :Foa a salt of weak acid and weak base
`K_(h) = (K_(w))/(K_(a)K_(b)) = ([HA][BOH])/([A^(-)][B^(+)]` and `h = sqrt((K_(w))/(K_(a)K_(b)))`
Hence degree of hydrolysis is independent of the concentration of the salt taken.
`{:("Further",A^(-)+H_(2)O hArr HA+OH^(-),,....(i)),(,B^(+)+H_(2)O hArr BOH + H^(+),,...(II)):}`
Since `K_(a)` of HA is more than `K_(b)` of BOH so the extent of backward reaction in (i) is greater than the extent of of hydrolysis of `B^(+)`
Hence choices (a), (c) and (d) are correct while (b) is incorrect.
Discussion
18515.

Which kind of isomerism is possible for a complex[Co (NH_3) _4Br_2]Cl ?

Answer»

GEOMETRICAL and IONIZATION
geometrical an OPTICAL
optical and ionization
geometricalonly

ANSWER :A
Discussion
18516.

What is the denticity of co-ordination compound used for the treatment of lead poisoning?

Answer»

Solution : In Lead poisoning EDTA (Ethylene diammine TETRAACETATE) is USED as LIGAND which is hexadentate i.e., the denticity of EDTA is 6. EDTA binds with metal in octahedral MANNER by two N-atoms and four acetate oxygen atoms.
Discussion
18517.

Which of the following undergoes dehydrobromination at a fastest rate?

Answer»




SOLUTION :
Discussion
18518.

Transition metals from

Answer»

Ionic BONDS
Ionic, covalent and COORDINATE covalent bonds
Covalent bonds
Vordinate covalent bonds

ANSWER :B
Discussion
18519.

Which of the following metals will not react with a solution of CuSO_(4)

Answer»

Fe
Zn
Mg
Hg

Solution :`CuSO_(4)+Hg RARR" No reaction"`
Hg is less reactive than Cu it comes below Cu in the REACTIVITY SERIES.
Discussion
18520.

The weight (in gram )of pure potash Alum (K_(2)SO_(4).Al_(2)(SO_(4) )_(3).24H_(2)O ) which contains 0.64kg oxygen is . (Atomic weight of K = 39 , S = 32 ,Al = 27 )

Answer»


ANSWER :X
Discussion
18521.

The structure of orthophosphoric acid is

Answer»



`Olarrunderset(H)UNDERSET(|)OVERSET(H)overset(|)(P)-O-H`
`H-O-overset(O)overset(uarr)(P)=O`

Solution :The structure of orthophosphoric acid, `H_(3)PO_(4)`

It is a tribasic acid i.e., 3-hydroxyl group are present. Phosphorus ATOM is in `sp^(3)` hybrid STATE.
Discussion
18522.

Which of the following is an example of Tyndall effect?

Answer»

BLUE colour of sea WATER
Twinkling of stars
VISIBILITY of TAILS of comets
All of these

Answer :D
Discussion
18523.

Which polymers occur naturally ?

Answer»

STARCH and NYLON
Starch and CELLULOSE
Proteins and Nylon
Proteins and PVC

Answer :B
Discussion
18524.

Twomolesof heliumgasare takenoverthe cycleABCDA , asshown in theP-Tdigram Assuming the gas to be ideal the work doneon thegas in takingif from A to Bis -

Answer»

200 R
300 R
`-400 R`
500 R

Solution :`w= -2 XX 10 ^(5)xx N xx R[T_(2)/(P_(2))-(T_(1))/(P_(2))]`
w = - 400 R`
Discussion
18525.

Vapour pressure of chloriform (CHCI_(3)) and dichloromethane (CH_(2)CI_(2)) at 25^(@)C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of solution obtained bu mixing 25.5 g of CHCI_(3) and 40.0g of CH_(2)CI_(2) at the same temperature will be (Mlecular mass of CHCI_(3)=1199.5 u and molecular mass of CH_(2)CI_(2)=85u

Answer»

<P>173.9 mm Hg
615.0 mm Hg
347.9 mm Hg
90.63 mm of Hg

Solution :`P_(CHCI_(3))^(@)=200 mm Hg. P_(CH_(2)CI_(2))^(@)=41.5 mm Hg`
Moles of `CHCI_(3)`
`("Mass")/("Molecular weight")=((25.5g))/((119.5g mol^(-1)))=0.213 mol`
Moles of `CH_(2)CI_(2)=((40g))/((85gmol^(-1)))=0.470 mol`
`X_(CHCI_(3))=((0.213))/((0.213+0.470))=0.31`
`X_(CH_(2)CI_(2))=(0.470)/(0.213+0.470)=0.69`
`P_(T)=P_(CHCI_(3))^(@)X_(CHCI_(3))+P_(CH_(2)CI_(2))^(@)X_(CH_(2)CI_(2))`
=`200xx0.31+41.5xx0.69
=62+28.63=90.63 mm of Hg
Discussion
18526.

Which one of the following does not correctly represent the correct order of the propertyindicated against it?

Answer»

`Ti lt V lt Cr lt Mn :` INCREASING MELTING points
`Ti lt V lt Mn lt Cr :` increasing2nd ionization ENTHALPY
`Ti lt V lt Cr lt Mn :` increasing number of oxidation states
`Ti^(3+) lt V^(3+) lt Cr^(3+)Mn^(3+) :`increasing magnetic moment.

Solution :(a) does not represent the correct order of melting points.The correct order is `: Ti lt V lt Cr gtMn`. The melting points of transitoin elements first increase to a maximum and then fall as atomic number INCREASES. Mn, HOWEVER,has abnormally low melting point due to stable configuration and weak intermetallic bonding.
Discussion
18527.

Which of the following vitamins can be stored in our body ?

Answer»

VITAMIN`B_(1)`
vitamin `B_(2)`
vitamin `B_(6)`
vitamin `B_(6)`

Answer :D
Discussion
18528.

Which is NOT true about valence bond theory (VBT) ?

Answer»

It cannot explain the spherical PROPERTIES of COMPLEX compounds.
It cannot explain correlation of magnetic behaviour based on geometry of the complex.
It can distinguish between weak field and strong field ligands.
It accounts for coordinate bond FORMATION due to overlap of vacant hybrid orbitals.

Answer :C
Discussion
18529.

Which complex of Co^(2+)will have the weakest crystal field splitting

Answer»

`[Co(CN)_(6)]^(4-)`
`[CoCl_(6)]^(4-)`
`[Co(en)_(3)]^(2+)`
`[Co(H_(2)O)_(6)]^(2+)`

Solution :Spectrochemical series
`I^(-) LT Br^(-)lt SCN^(-) lt CL^(-) lt S^(2) lt F^(-)lt OH^(-) lt C_(2)O_(4)^(2-) lt H_(2)Olt NCS^(-) lt EDTA^(4-) lt NH_(3) lt en lt CN^(-) lt CO`
( Strongest)
Discussion
18530.

Which of the following carbohydrates is used in silvering of mirrors?

Answer»

Glucose
Sucrose
Cellulose
starch

Answer :A
Discussion
18531.

The substituted pyrimidines are

Answer»

ADENINE
uracil
cytosine
guanine

Answer :B::C
Discussion
18532.

Which is/are the correct method for separatig a mixture of benzoic acid p- methylaniline & phenol

Answer»

`OVERSET(AQ.NaHCO_(3))(to) overset(aq.NaOH)(to)`
`overset (aq.HCl)(to)overset(aq.NaHCO_(3))(to)`
`overset(aq.NaOH)(to) overset(aq. NaHCO_(3))(to)`
`overset(aq.NaOH)(to) overset(aq.HCl)(to)`

SOLUTION :
Discussion
18533.

XeF_6 on partial hydrolysis gives

Answer»

`XeOF_4` only
`XeO_2F_2` only
both `XeOF_4`and `XeO_2F_2`
`XeOF_4`or `XeO_2F_2`

ANSWER :D
Discussion
18534.

Which one of the following vitamins cheks night blindness

Answer»

A
B
C
D

ANSWER :A
Discussion
18535.

Which of the following reactions is/are correctly represented

Answer»




SOLUTION :
Discussion
18536.

Which of the following acids is used Friedel-Craft's reaction-

Answer»

`HClO_4`
HCL
`HNO_3`
`BF_3`

ANSWER :D
Discussion
18537.

The sharp melting point of crystalline solids is due to …….

Answer»

a regular ARRANGEMENT of constituent PARTICLES observed over a short distance in the CRYSTAL LATTICE.
a regular arrangement of constituent particles observed over a long distance in the crystal lattice. 
same arrangement of constituent particles in DIFFERENT directions.
different arrangement of constituent particles in different directions.

Solution :In crystalline solids the constituent particles are arranged in a definite geometrical pattern as a result the type of forces in crystalline solids are of long range order due to which it has sharp melting points.
Discussion
18538.

Which Vitamin deficiency leads to cheilosis?

Answer»

VITAMIN`B_(12)`
Vitamin`B_(6)`
Vitamin`B_(2)`
Vitamin`B_(5)`

ANSWER :C
Discussion
18539.

Which of the following complex is a low spin complex ?

Answer»

`K_(4)[Fe(CN)_(6)]`
`[PtCl_(4)]^(2-)`
`[Co(C_(2)O_(4))_(3)]^(3-)`
`[NI(NH_(3))_(6)]^(2+)`

Answer :A
Discussion
18540.

When 10 ml of 0.1 M acetic acid (pK_(a) = 5.0) in titrated against 10 ml of 0.1 ml of 0.1 M ammonia solution (pK_(b) = 5.0), the equivalence point occurs at pH

Answer»

`5.0`
`6.0`
`7.0`
`9.0`

SOLUTION :`pK_(a) = -LOG K_(sp)pK_(b) = -logK_(b)`
`pH = -(1)/(2)[log K_(a) + log K_(w) - log K_(b)]`
`= (1)/(2)[-5 + log(1 xx 10^(-14)) - (-5)]`
`= -(1)/(2)[-5-14+5] = -(1)/(2)(-14) =7`
Discussion
18541.

alpha-helix is a secondary structure of proteins formed by twisting of polypeptide chain into right handed screw like structure. Which type of interactions are responsible for making the alpha-helix structure stable?

Answer»

Peptide bonds between - `NH_2` group and `CO` groups of adjacent carbon chains
Hydrogen bonds between - NH of amino ACID in one TURN with - CO of amino acid to adjacent turn
`-OH` group of one turn with -CO of amino acid on the turn
Hydrogen bonds between adjacent amino ACIDS

Answer :B
Discussion
18542.

Which of the following carboxylic acids is most reactive toward esterification ?

Answer»

`(CH_(3))_(3)C COOH`
`CH_(3))_(2)CHCOOH`
`CH_(3)CH_(2)COOH`
`(C_(2)H_(5))_(2)CHCOOH`

SOLUTION :`CH_(3)CH_(2)COOH` is most REACTIVE towords esterification. The esterification of carboxylic acids with alcohols is a kind of nucleophilic acyl substitution. Protanation of the carbonyl OXYGEN activates of carbonyl group towards nucleophilic addition of alcohol. Therefore,carboxylic ACID with less number of electron releasing group most reactive.
Discussion
18543.

Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following : (i) [CoF_(6)]^(3-),[Co(H_(2)O)_(6)]^(2+),[Co(CN)_(6)]^(3-) (ii) [FeF_(6)]^(3-),[Fe(H_(2)O)_(6)]^(2+),[Fe(CN)_(6)]^(4-)

Answer»

SOLUTION :
`N=0, mu=sqrt(n(n+2))=0`. Hence, it is diamagnetic.
(ii) `FeF_(6)^(3-)" has "Fe^(3+)=3d^(5)=t_(2g)^(3)e_(g)^(2),n=5,mu=sqrt(5(5+2))=sqrt(35)=5.92 BM`
(`F^(-)` is a weak field ligand, `Delta_(0)ltP`)
`[Fe(H_(2)O)_(6)]^(2+)` has `Fe^(2+)=3d^(6)=t_(2g)^(4)e_(g)^(2), n=4, mu=sqrt(4(4+2))=sqrt(24)=4.9BM`
(`H_(2)O` is a weak field ligand, `Delta_(0)ltP`)
`[Fe(CN)_(6)]^(4-)" has "Fe^(2+)=3d^(6)=t_(2g)^(6)e_(g)^(0), n=0, mu=0` (diamagnetic), (`CN^(-)` is a STRONG field ligand, `Delta_(0)gtP`)
Discussion
18544.

Which is/are correct about electronegativity order of the following elements ?

Answer»

`P GT SI` <BR>`C gt N`
`C gt Br`
`Sr gt Ca`

Answer :A
Discussion
18545.

Which of the following is an example of liquid dishwashing detergent ?

Answer»

`CH_(3)(CH_(2))_(10)-CH_(2)OSO_(3)^(-)Na^(+)`


`[CH_(3)(CH_(2))_(15)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"N "-CH_(3)]^(+)Br^(-)`

Answer :B
Discussion
18546.

Which of the products is formed when acetone is reacted with barium hydroxide solution?

Answer»




SOLUTION :
Discussion
18547.

What weight of CO_(2) will contain same number of oxygen atoms as are present in 3.6 g of water ?

Answer»

8.8 g
7.2 g
4.4 g
220 g

Solution :No. of WATER molecules in 3.6 g of water
` = (3.6)/(18) XX 6 xx 10^23 ` molecules
` = 1.2 xx 10^23 ` molecules
No. of OXYGEN atoms
` = 1.2 xx 10^23`
Now ` 2 xx 6 xx 10^23` atoms of oxygen in `CO_2`
= 44G
`1.2 xx 10^23` atoms of oxygenin `CO_2`
` = (44)/(2 xx 6 xx 10^23)xx 1.2 xx 10^23`
4.4 g
Discussion
18548.

Which is the correct repesentation for K = C_1/C_2 relation ?

Answer»

The distributioncoefficient K
The DISTRIBUTION coefficient K is in favour of phase II
The distribution coefficient K is in favour of phase I
None of the above

ANSWER :C
Discussion
18549.

What type of aldehydes and ketones undergo aldol condensation?

Answer»

Solution :ALDEHYDES and ketones CONTAINING one or more `alpha`-hydrogen/s, i.e., ACETALDEHYDE, ACETONE, ETC.
Discussion
18550.

Using the data given below find out the strongest reducing agent. E_(Cr_(2)O_(7)^(2-)|Cr^(3+))^(Theta)=1.33V,E_(Cl_(2)|Cl^(-))^(Theta)=1.36V E_(MnO_(4)^(-)|Mn^(2+))^(Theta)=1.51V,E_(Cr^(3+)|Cr)^(Theta)=-0.74V

Answer»

`Cl^(-)`
`Cr`
`Cr^(3+)`
`Mn^(2+)`

Solution :The standard reduction ELECTRODE potential of `E_(Cr^(3+)|Cr)^(Theta)=-0.74V` is very LESS value (Highly negative).
So Cr is STRONG reducing agent.
`Cr to Cr^(3+) +3e^(-)`
* Cr EASILY oxidize and hence it is strong reducing in nature. `Mn^(2+) lt Cl^(-) lt Cr^(3+) lt Cr`.
Discussion