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.

4001.

What happens when calcium ethanoate is dry distilled?

Answer»

SOLUTION :.
Discussion
4002.

Which one is most volatile?

Answer»

`CH_(3)CH_(2)CH_(2)NH_(2)`
`(CH_(3))_(3)N`

`CH_(3)OH`

Answer :2
Discussion
4003.

The total number of stereoisomers formed at the end product 'W' is :

Answer»


SOLUTION :
Discussion
4004.

Which of the following facts are correct -

Answer»




all of the above

Answer :A::C
Discussion
4005.

Which of the following is not a protein:

Answer»

WOOL
Nail
Enzyme
Nucleoside

Answer :D
Discussion
4006.

Which one is bacteriostatic ?

Answer»

Erythromycin
Tetracycline
Chloramphenicol
All of the GIVEN 

SOLUTION :All of the given
Discussion
4007.

The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral there are 4 Ca^(2+) ions and 8F^(-) ions and that Ca^(2+) ions are arranged in a fcc-lattice. The F^(-) ions fill all the tetrahedral holes in the face centred cubic lattice of Ca^(2+) ions. The edge of the unit cell is 5.46 xx 10^(-8) cm in length. The density of the solid is 3.18 g cm^(-3). Use this information to calculate Avogadro's number. (Molar mass of CaF_(2) = 78.08 g mol^(-1))

Answer»

Solution :`d = (Z xx M)/(a^(3) xx N_(A))`
For fcc LATTICE Z = 4
3.18 g `CM^(-3) = (4 xx 78.08 g mol^(-1))/((5.46 xx 10^(-8)cm)^(3) xx N_(A))`
`N_(A) = (4 xx 78.08 g mol^(-1))/((5.46 xx 10^(-8)cm)^(3) xx 3.18 g cm^(-3))`
`N_(A) = 6.033 xx 10^(23) mol^(-1)`
Discussion
4008.

Whch ofthe following statement(s) is/are correct :Statement (a) : In any closedsystemwith P,Vwork only ,Gisalways minimizedat eqilibrium .Statement (b): DeltaG isalways zero for a

Answer»


SOLUTION :N//A
Discussion
4009.

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:

Answer»

`M/(K_bY)`
`(4K_By)/(M)`
`(K_bY)/(4M)`
`(K_bY)/M`

ANSWER :B
Discussion
4010.

Which of the following graphs represent a first order reaction (a=initial concentration of reactant, x=concentration of reactant consumed, t=time)

Answer»

a,B,d
C,d
b,c
a,b

Answer :C
Discussion
4011.

Which of the following ion is not precipitated either by HCl or H_(2)S

Answer»

`AG^(+)`
`Cu^(+2)`
`Pb^(+2)`
`Mg^(+2)`

SOLUTION :`Mg^(+2)`
Discussion
4012.

Which of the following formulae represents 2, 5-Dibromo-4-ethyl-2-heptenal according to IUPAC rules ?

Answer»

`CH_(3)-UNDERSET(BR)underset(|)(C)-CH=underset(C_(2)H_(5))underset(|"")(CH)-underset(Br)underset(|)(CH)-CH_(2)-CH_(2)-CH_(3)`
`CH_(3)-underset(Br)underset(|)(C)=CH-underset(C_(2)H_(5))underset(|)(CH)-underset(Br)underset(|)(CH)-CH_(2)-CH_(2)-CHO`
`CH_(3)-CH_(2)-underset(Br)underset(|)(CH)-underset(C_(2)H_(5))underset(|"")(CH)-CH=underset(Br)underset(|)(C)-CHO`
`CH_(3)-CH_(2)-underset(Br)underset(|)(CH)-underset(C_(2)H_(5))underset(|"")(CH)-CH=C-underset(Br)underset(|)(CH_(2))-CHO`.

Answer :C
Discussion
4013.

When HCOONa is heated to 390^(@)C, it gives

Answer»

NAOH + CO
Sodium acetate
HCHO
Sodium oxalate

Answer :D
Discussion
4014.

Which of the following complex involves d^(2)sp^(3) hybridization ?

Answer»

`[CO(H_(2)O)_(6)]^(3+)`
`[Co(F_(6)]^(3-)`
`[Mn(H_(2)O)_(6)]^(2+)`
`[FE(H_(2)O)_(6)]^(3+)`

ANSWER :A
Discussion
4015.

Which of the following metals do not combine directly with hydrogen gas to form hydride?

Answer»

Mg
Ca
Be
Sr

Answer :C
Discussion
4016.

The starting material for the preparation of CHI_3 is :

Answer»

`C_2H_5OH`
`CH_3OH`
`C_2H_5CHO`
`HCHO`

ANSWER :A
Discussion
4017.

Write the mechanisms of action of hydrogen bromide on tert-butyl methyl ether.

Answer»

Solution :When tert-butyl methyl ether is heated with hydrogen bromide tert-butyl bromide and METHANOL is FORMED. Reaction mechanism :
(1) INITIALLY, tert-butyl methyl ether is protonated by hydrogen bromide to form tert-butyl methyl oxonium ion.

(2) The cleavage of C-O BOND in protonated ether GIVES more stable tert-butyl carbocation and methyl alcohol.

(3) Further, the more stable tert-carbocation reacts with bromide ion to form tert-butyl bromide.
Discussion
4018.

What is meant by 'acidity constant', K_(a)? How is it expressed?

Answer»

SOLUTION :ACIDITY constant `K_(a)` is a MEASURE of the strength of the acid. Obviously greater is the VALUE of `K_(a)`, stronger is the acid. It is expressed as, `K_(a)=([RCOO^(-)][H_(2)O^(+)])/([RCOOH])`
Discussion
4019.

Which has maximum pK_(a) value ?

Answer»




Solution :`pK_(a)=-logK_(a) therefore"If" K_(a)" is HIGH, "pK_(a)" is LOW."`
`1^(@)` alcohol is the strongest acid thus has MAXIMUM `K_(a)` value. `3^(@)` alcohol is the weakest acid and thus has minimum `K_(a)` value and maximum `pK_(a)` value
Discussion
4020.

Which of the following alkoxide nucleophiles is most reactive towards SN^2reaction

Answer»

`CH_3O^-`
`CH_3CH_2O^-`
`CH_3-undersetoverset(|)(CH_3)(C )H - O^-`
`(CH_3)_3CO^- `

SOLUTION : ELECTRON DENSITY at oxygen of Alkoxide ion increases reactivity decreases towards `SN` reactionhence `CH_3O^-`is more REACTIVE
Discussion
4021.

Which metal is used in Wurtz reaction

Answer»

Mg
K
Ca
Na

Answer :D
Discussion
4022.

Use the data given in q.8 and find out most stable ion is its reduced form.

Answer»

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

Solution :
`E_(MnO_(4)^(-)//mn^(2+))` has highest standard reduction potential HENCE most stable form among four is `Mn^(2+)`
Discussion
4023.

What is the mass of one litre of cottonseed oil of density 926kg//m^(3)

Answer»

926 kg
92.6 kg
0.926 kg
9260 kg

Solution :GIVEN,
Volume of COTTONSEED OIL, `1L=10^(-3) m^(3)`
Density of cottonseed oil, `d=926 kg//m^(3)`
`THEREFORE` Mass of cottonseed oil, m=v,d
`=10^(-3) m^(3) 5 926 kg//m^(3)`
=0.926 kg
Discussion
4024.

Which of the following does not give Cannizzaro reaction?

Answer»

`HCHO`
`C_(6)H_(5)CHO`
`CH_(3)C_(6)H_(4)CHO`
`CH_(3)CHO`

ANSWER :D
Discussion
4025.

Which of the following reactions occur during the detection of nitorgen in organic substances by Lassaigne's test?

Answer»

`Na+C+NtoNaCN`
`FeSO_(4)+6NaCNtoNa_(4)[FE(CN)_(6)]+Na_(2)SO_(4)`
`Na_(4)[Fe(CN)_(6)]+2Fe_(2)(SO_(4))_(3)toFe_(4)[Fe(CN)_(6)]_(3)+6Na-(2)SO_(4)`
none of these

Solution :The various reactions TAKING place in Lassaigne's test for nitrogen are
`Na+C+NtoNaCN`
`FeSO_(4)+6NaCNtoNa_(4)[Fe(CN)_(6)]+Na_(2)SO_(4)`
`3Na_(4)[Fe(CN)_(6)]+2Fe_(2)(SO_(4))_(3)toFe_(4)[Fe(CN)_(6)]_(3)+6Na_(2)SO_(4)`
Prussion blue colour
Discussion
4026.

Which one of the following compounds is not planar

Answer»

`C_2H_2gt SO_2gtCH_4gtH_2OgtNH_3`
`H_2O GT NH_2 gt CH_4 gt C_2H_2gt SO_2`
H_2O gt NH_3 gt CH_4 gt SO_4gt C_2H_2
`C_2H_2gtSO_2gtCH_4gtNH_3gtH_2O`

ANSWER :D
Discussion
4027.

Which of the following reactions is an example for calcination process ?

Answer»

`2Ag+2HCl +(O) to 2AgCl+H_(2)O`
`2Zn+O_(2) to 2ZnO`
`2ZnS+3O_(2) to 2ZnO+2SO_(2)`
`MgCO_(3) to MgO+CO_(2)`

Solution :DECOMPOSITION of carbonates and hydrated oxides.
Discussion
4028.

Which one of the following is a protein fibre

Answer»

POLYESTER
COTTON
SILK
Rayon

Answer :C
Discussion
4029.

The same amount of electricity was passed through molten cryolite containing Al_(2)O_(3) and NaCl. If 1.8 g of Al were liberated in one cell, the amount of Na liberated in the other cell is

Answer»

4.6 G
2.3g
6.4 g
3.2 g

ANSWER :A
Discussion
4030.

The zero group members are collectively known as:

Answer»

INERT Gases
Rare gases
Noble gases
Either of these

Answer :D
Discussion
4031.

Which of the following compounds will recact with ethanolic KCN?

Answer»

`CH_3CH_2Cl`
`CH_3COCl`
`C_6H_5Cl`

ANSWER :C
Discussion
4032.

When NH_(4)Cl is not used together with NH_(4)OH in group-III reagent which of the following cation will not be precipitated?

Answer»

`Fe^(2+)`
`Cr^(3+)`
`Zn^(2+)`
`NH_(3)` soln.

Solution :In the absence of `NH_(4)^(+)` IONS or `NH_(4)Cl`, DISSOCIATION of `NH_(4)OH` is large i.e., concentration of `OH^(-)` is considerable to increase ionic products of hydroxides of `Fe^(2+),Cr^(3+) and Zn^(2+)` from their respective `K_(SP)`valeus, hence they will precipitate in `III^(rd)` group. however, `Ba(OH)_(2)` is SOLUBLE due to high `K_(sp)` value.
Discussion
4033.

Which of the following is a bactericidal antibiotic ?

Answer»

Ofloxacin
Tetracycline
Chloramphenicol
Erythromycin

Solution :BACTERICIDAL are the drugs that kills bacteria. Ofloxacin WORKS by stopping the growth of bacteria. This antibiotic TREATS only BACTERIAL infections.
Discussion
4034.

The rusting of iron is catalysed by

Answer»

Fe
`O_(2)`
`H^(+)`
Zn

Solution :The reaction occurring during rusting PROCESS are as FOLLOWS :
At anode: `Fe(s) to Fe^(2+)(aq) + 2e`
At cathode:
`O_(2)(g) + 4H^(+)(aq) to 2H_(2)O`
The `Fe^(2+)` ions, formed, are further oxidised by atmosphere oxygen to `Fe^(3+)` (as `Fe_(2)O_(3)`) and come as rust `(Fe_(2)O_(3).xH_(2)O)`. The `H^(+)`, formed in the rust formation, catalysed the process of rusting.
Discussion
4035.

The vapour pressure of a solution cont.aning 10 g of a non-electrolyte in 200 g of water at a particular temperature is 2985 Pa. The vapour pressure of pure water at that temperature is 3000 Pa. Calculate the molecular mass of the solute.

Answer»

Solution :`(P^(0) - P)/(P^(0)) = (M_(2) W_(1))/(W_(2)M_(1))`
`(3000 - 2985)/(3000) = (10x 18)/(M_(2) XX 200) `
`M_(2) = (10 xx 18 xx 3000 )/(200 xx 15 )`
`mu_(2) `= 180 .
Discussion
4036.

Units of Faradays are

Answer»

AMPERE
C
C/mol
C/sec

Answer :C
Discussion
4037.

The specific conductance of a saturated solution of AgCl at25^(@) Cis 2.28 xx 10^(-6) S cm^(-1) . If solubility ofAgCl" is " 2.35 xx 10^(-x) gL^(-1) ( lambda_(AgCl)^(@) = 138.3 S cm^(2) mol^(-1)) then x is

Answer»


Solution :`S = M = ( K xx 1000)/(^^_M) = (2.28 xx 10^(-6) xx 10^(3))/(138.3) , S = 0.016486 xx 10^(-3)`
`=1.6486 xx 10^(-2) xx 10^(-3) = 1.65 xx 10^(-5) = " mole/L" = 2.36 xx 10^(-3)g//L`
Discussion
4038.

Which one is a major impurity in pig iron ?

Answer»

Si
O
S
C

Answer :D
Discussion
4039.

The theoretical magnetic moment of ""_(27)Co is 3.87BM. Which one of the correct compound from the following?

Answer»

`CO(NO_(3))_(2)`
`CoCl_(3)`
`[CoF_(6)]^(2-)`
`[Co(NH_(3))_(6)]^(3+)`

Answer :A
Discussion
4040.

Which one is the complementary base of adenine in one strand to that in the other strand of DNA:

Answer»

Cytosine
Guanine
Uracil
Thymine

Answer :D
Discussion
4041.

Which of the following structures is a D-aldotetrose that gives a meso diacid upon oxidation with dilute aq. HNO_3 ?

Answer»




ANSWER :C
Discussion
4042.

When Zn piece is kept in CuSO_4 solution, copper gets precipitated because :

Answer»

Standard REDUCTION potential of zinc is more than COPPER
Standard reduction potential of zinc is LESS than copper
Atomic NUMBER of zinc is larger than copper
) Atomic number of zinc is lower than copper

Answer :B
Discussion
4043.

The state of hybrid orbitalsof carbon in CO_(2), CH_(4) and CO_(3)^(2-) respectively is

Answer»

`SP^(3) ,sp^(2) and sp`
`sp^(3), sp and sp^(2)`
`sp, sp^(3)and sp^(2)`
`sp^(2), sp^(3) and sp`

SOLUTION :
Discussion
4044.

Which of the following salt will have the same value of Van't Hoff's factor (i) as that of K_(4)[Fe(CN)_(6)]

Answer»

`Al_(2)(SO_(4))_(3)`
NaCl
`AL(NO_(3))_(2)`
`Na_(2)SO_(4)`

Answer :A
Discussion
4045.

Which of the following statement is not true about amorphous solids?

Answer»

On heating they may become CRYSTALLINE at certain temperature. 
They may become crystalline on keeping for long time. 
Amorphous solids can be moulded by heating
They are ANISOTROPIC in nature.

Solution :Amorphous solids are isotropic because of INDEFINITE arrangement of CONSTITUENT particles.
Discussion
4046.

Which of the following is 'not' a colligative property?

Answer»

VAPOUR pressure
DEPRESSION in FREEZING point
ELEVATION in boiling point
Osmotic pressure

ANSWER :A
Discussion
4047.

The vapour pressure of pure benzene at a certain temperature is 200 mm Hg. A non-volatile solute weighing 2.175 g is added to 39.0 g of benzene. The vapour pressure of solution is 600 mm Hg. What is the molar mass of the solute ?

Answer»


Solution :`P_(A)^(@)=640" mm HG, "P_(S)=600" mm Hg, " W_(B)=2.175h, W_(A)=39.0 g.`
`M_(A)(C_(6)H_(6))=78" g mol"^(-1)`
According to Raoult's Law (solution is IDEAL or dilute),
`(P_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`((640-600)mm)/(600mm)=((2.175g))/((M_(B)))xx((78" g mol"^(-1)))/((39.0 g))`
`M_(B)=((2.175 g)xx(78" g mol"^(-1)))/((39.0 g))xx((78" g mol"^(-1)))/((40 mm))=65.25" g mol"^(-1).`
Discussion
4048.

What are co-polymers? Give example.

Answer»

Solution :The polymers MADE by ADDITION polymerisation from two different MONOMERS are called copolymers.
Ex : BUNA - s, Buna - N.
Discussion
4049.

To 1 M solution of AgNO_(3), 0.75 F quantity of current is passed. What is the concentration of the electrolyte, AgNO_(3) remaining in the solution?

Answer»

Solution :Given : Initial concentration of
`AgNO_(3)=1M=1N`
Quantity of current = 0.75 F
Formula :
`""` 1 Faraday = 1 equivalent mass
Solution :
For 1 F current In `AgNO_(3)` will be liberated.
For 0.75 F current 0.75 N `AgNO_(3)` will be liberated.
The concentration of `AgNO_(3)` REMAINING
`""=1.0-0.75`
`""` = 0.25 N
`therefore` The concentration of `AgNO_(3)` remaining
`""`= 0.25 M
Discussion
4050.

Which of the following is a synthetic polymer?

Answer»

Cellulose
Starch
PUC
Protein

Answer :C
Discussion