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.

16201.

Which of the following ions can be replaced by H^(+) ions when H_(2) gas is bubbled through the solutions containing these ions?

Answer»

`Li^(+)`
`Ba^(2+)`
`Cu^(2+)`
`Be^(2+)`

Solution :AMONG the given IONS, only `Cu^(2+)` LIES below `H^(+)` in electrochemical SERIES.
Discussion
16202.

Which of the following is most soluble in water

Answer»

`CH_3-OH`
`C_2H_5-Cl`
`CH_3-O-CH_3`
`C_2H_5-OH`

ANSWER :A
Discussion
16203.

Whichof the following statements are correct?

Answer»

`CH_(3)overset(o+)(N) -= overset(THETA)(C)` on partial hydrolysis gives `N`-methyl methanamide.
`CH_(3)overset(o+)(N) -= overset(ɵ)(C)` on partial hydrolysis gives `CH_(3)NH_(2)` and `HCOOH`.
In an ISOCYANIDE, first an electrophile and then a nucleoplile add at the same `C` ATOM bearing negative charge.
In an isocyanide, first a nucleophile and then an electrophile add at the same `C` atom bearing negative charge.

Solution :.
Discussion
16204.

Which of the following does not have dipole moment ?

Answer»

1. `ClO_(2)`
2. `SO_(2)`
3. `NO_(2)^(+)`
4. `NO_(2)`

ANSWER :C
Discussion
16205.

What will happen if borontrifluoride is kept in moist air?

Answer»

it will strongly fume
It will partially hydrolyse.
It will completely hydrolyse
None of these

Solution :In moist air it strongly fume, but it is partially HYDROLYSED by excess of WATER.
`4BF_(3)+6H_(2)Oto3H_(3)O^(+)+3BF_(4)^(-)+B(OH)_(3)`
`BF_(3)` is a colourless gas.
Discussion
16206.

Which of the following oxide is stronglyacidic?

Answer»

`P_(2)O_(5)`
`SiO_(2)`
`Cl_(2)O_(7)`
`Al_(2)O_(3)`

ANSWER :C
Discussion
16207.

Which of the following statements is/are true for the complexes, [Fe(H_(2)O)_(6)]^(2+), [Fe(CN)_(6)]^(4-), [Fe(C_(2)O_(4))_(3)]^(2-)" and "[Fe(CO)_(5)] ?

Answer»

only `[FE(C_(2)O_(4))_(3)]^(3-)` shows optical isomerism.
`[Fe(C_(2)O_(4))_(3)]^(3-)` is less stable than `[Fe(CN)_(6)]^(4-)`.
All complexes have same effective atomic number.
`[Fe(CO)_(5)]` show back bonding.

Answer :A::D
Discussion
16208.

Which of the following compounds can be used for drying of H_(2)S gas? I. Conc H_(2)SO_(4) II. P_(4)O_(10) III. Anhydrous CaC1_(2) IV. Anhydrous Al_(2)O_(3)

Answer»

only II, III and IV
only I
only II and III
only III

Answer :A
Discussion
16209.

Which of the following has more number of p pi-dpi bonds?(all central atoms are in excited states)

Answer»

`SO_(2)`
`SO_(3)`
`SO_(3)^(2-)`
`CO_(3)^(2-)`

ANSWER :B
Discussion
16210.

Which one of the following statements is not true for glucose?

Answer»

`alpha-D(+)-` glucose undergoes mutarotation
It has four asymmetric carbons in Fischer projcction FORMULA
It gives saccharic acid with Tollen's reagent
It REACTS with hydroxyl AMINE

ANSWER :C
Discussion
16211.

What is invert sugar ?

Answer»

SOLUTION :When sucrose (dextro-rotatory) is hydrolysed, there is change in the sign of rotation from dextro before hydrolysis to LAEVO after hydrolysis and the MIXTURE (glucose and FRUCTOSE) obtained is called invert SUGAR.
Discussion
16212.

What volume of 90% alcohol by weight (d=0.8 g mL^(-1)) of ethanol must be used to prepare 40 mL of 10% alcohol by weight (d=0.9 g mL^(-1))

Answer»


SOLUTION :Let x of `Na_(2)CO_(3)` . Then, weight of `NaHCO_(3)=(15-x)g`
Moles of `NaCl` is produced `=(11.0 g)/(58.5 g)=0.188` MOL
The `NaCl` is produced by the reaction of `(x/106)` mol of `Na_(2)CO_(3)` and `((15-x))/84` mol of `NaHCO_(3)`. Each mol of `Na_(2)CO_(3)` produces 2 mol of `NaCl`
`:. (2X)/106+(15-x)/84=0.188`
Solve `x := 1.35 g Na_(2)CO_(3)`,
`NaHCO_(3)=(15-1.35)=13.6 g`
`% Na_(2)CO_(3)=13.5/15xx100=9.0% Na_(2)CO_(3)`.
Discussion
16213.

Which of the followingcompoundis used for watersoftening

Answer»

`Ca_(3)(PO_(4))_(2)`
`Na_(3)PO_(4)`
`Na_(6)P_(6)O_(18)`
`Na_(2)HPO_(4)`

ANSWER :B
Discussion
16214.

Which of the following statement (s) is (are) correct when a mixture of NaCl and K_(2)Cr_(2)O_(7) is gently warmed with conc. H_(2)SO_(4)

Answer»

A deep red vapour is evolved
The vapours when PASSED into NaOH solution gives a yellow solution of `Na_(2)CrO_(4)`
Chlorinegas is evolved
Chromyl chloride is formed

Solution :The reactions are `4NaCl+K_(2)Cr_(7)O_(7)=6H_(2)SO_(4)to2CrO_(2)Cl_(2)+4Naunderset(("Red vapours"))(HSO_(4)+2KH)SO_(4)+3H_(2)O,underset("Chromyl chloride")(CrO_(2)Cl_(2))+4NaOH to underset("yellow solution")(Na_(2)CrO_(4))+2NaCl+2H_(2)O`
Discussion
16215.

Which one of the following species will be most reactive in S_(N^(2)) reaction

Answer»




SOLUTION :`S_(N^(2))` is a CONCERTED reaction, so will be favoured at least sterically hindered CARBON atom or a PRIMARY carbon atom i.e., option (a).
Discussion
16216.

Write the structure of the major organic product in each of the following reactions :CH_(3)CH_(2)Br+KCN overset(" aq. ethanol")rarr

Answer»

SOLUTION :`CH_(3)-CH_(2)CN`
Discussion
16217.

Whichof the following acidundergoes decarboxylationeasily?

Answer»




SOLUTION :`BETA` - ketoon heatingeasilyundergo decarboxylationdecarboxylation , viasixmembered cyclictransitionstate .
Discussion
16218.

The stability of lyophilic colloid is due to which of the following :

Answer»

CHARGE on their particles
Large size of their particels
Small size of their particles
Solvation by dispersion MEDIUM

Solution :Lyophilic colloid is solvated by dispersion medium and BECOMES more STABLE.
Discussion
16219.

Which of the following halogen can be purified by sublimation

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

ANSWER :D
Discussion
16220.

Which one of the following bases is not present in DNA?

Answer»

Ouinoline
Adenine
Cytosine
Thymine

Solution :Quinoline is an ALKALOID, it is not present in DNA. DNA has FOUR nitrogen BASES as adenine, GUANINE, cytosine and thymine.
Discussion
16221.

Which of the following is molecular disease ?

Answer»

Allergy
Cancer
German measles
Sickel- CELL -ANEMIA

ANSWER :B
Discussion
16222.

What types of bonding helps in stabilizing the alpha-helix structure of proteins ?

Answer»

Solution :The `alpha`-helix structure is the most ways in which a POLYPEPTIDE chain forms all possible hydrogen bonds by TWISTING into a right-handed SCREW (Helix) with the -NH group of each amino acid residue hydrogen bonded `gt C=O`of an ADJACENT turn the helix.
Discussion
16223.

Which of the following is not a pyrimidine:

Answer»

GUANINE
Uracil
Cytosine
Thymine.

ANSWER :A
Discussion
16224.

Which one is false in the following statements ?

Answer»

Each carbon in ethylene is in `SP^(2)` HYBRIDIZATION
Each carbon in acetylene is in `sp^(3)` hybridization
Each carbon in BENZENE is in `sp^(3)` hybridization
Each carbon in ethane is in `sp^(3)` hybridization

Answer :B
Discussion
16225.

To separete a mixture of amines from each other one should follow

Answer»

BECKMANN's method
Hinsberg's method
Zeisel method
Victor MEYER's method

Answer :B
Discussion
16226.

Which of the following is not the true protein?

Answer»

COTTON
NAIL
HAIR
DNA

SOLUTION :DNA
Discussion
16227.

Write the electrochemical cell for the overall cell reaction Zn_((s))+2AgNO_(3)rarr2Ag_((s))+Zn(NO_(3))_(2).

Answer»

Solution :`Zn_((s))+2AgNO_(3) RARR 2Ag_((s))+Zn(NO_(3))_(2)`
`Zn_((s)) ABS(Zn_(AQ)""^(2+))abs(Ag_((aq))""^(+))Ag_((s))`
Anode Half cell `""` Cathode Half cell
In this cell REACTION, Zn is oxidised to `Zn^(2+) " and " Ag^(2+)` is reduced to Ag.
Discussion
16228.

When a solution containing "W" g of urea in 1 kg of water is cooled to -372(@)C, 200g of ice is separated . If K_(f) for water is 1.86 K kg "mol"^(-1). W is ___________

Answer»

4.6
12
9.6
6

Answer :C
Discussion
16229.

Write down the name of known polymer of polyesters category and also explain its preparation and uses.

Answer»

Solution :Dacron or terylene are the very KNOWN name of POLYESTERS.
These are the polycondensation products of dicarboxylic acids and diols.
Terylene or Dacron :
Preparation : It is manufactured by HEATING a mixture of ethylene glycol and terephthalic acid at 420 to 460 K in the presence of zinc acetate- antimony trioxide catalyst as per the reaction by condensation polymerization.

PROPERTIES : Dacron fibre (terylene) is crease resistant and is used in blending with cotton and wool fibres.
Uses : It is used as glass reinforcing materials in SAFETY helmets, etc.
Discussion
16230.

Which of the following compounds is oxidised to prepare methyl ethyl ketone?

Answer»

PROPANOL -2
Butanol -1
Butanol _2
Tert BUTYL alcohol

Answer :C
Discussion
16231.

Which of the following lagands can act only pi-donor ligand?

Answer»

`C_(5)H_(5)^(-)`
`C_(3)H_(5)^(-)`
`C_(6)H_(6)`
CO

Answer :C
Discussion
16232.

Which of the following reactions gives an dialkyl oxonium salt :

Answer»

ETHYL alcohol + SODIUM metal
Diethyl ether +hydrochloric acid
Tertialry amine + ALKYL halide
Nitromethane + sodium metal

Answer :B
Discussion
16233.

Which of the following species are hypervalent? (A) ClO_(4)^(-)""(B)BF_(3) (C ) SO_(4)^(-2)""(D)CO_(3)^(-2)

Answer»

A, B, C
C, D
A, C
A, B

ANSWER :C
Discussion
16234.

Which of the following hydroxide has maximum basic character ?

Answer»

`La(OH)_(3)`
`Pm(OH)_(3)`
`Dy(OH)_(3)`
`Lu(OH)_(3)`

Solution :As the size of the ION is decreased. Its tendency to DONATE electrons is decreased.
As a result, its basic CHARACTER DECREASES.
Discussion
16235.

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

Answer»

`CH_(3)CH_(2)-CH_(2)-OH`
`CH_(3)CH_(2)-UNDERSET(CH_(3))underset(|)(C)H-OH`
`CH_(3)CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(2)OH`
`CH_(3)CH_(2)-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-OH`

Solution :`3^(@)` ALCOHOLS being most reactive react at room temperature.
Discussion
16236.

Which one of the followingstatementregardingphotochemicalsmogis not correct.

Answer»

Carbonmonoxidedoes not playany roleinphotochemicalsmogformation .
Photochemicalsmogis anoxidisingagentin CHARACTER.
Photochemicalsmogis formedthroughphotochemicalreactioninvolvingsolarenergy.
Photochemicalsmogdoes not CAUSE . Irritationeyesand THROAT.

ANSWER :D
Discussion
16237.

Which of the following molecule is capable of forming zwitter ion?

Answer»

`CH_(3) - CHOH- NH_(2)`
`NH_(2)CH_(2) COOH`
`CH_(3) -COOH`
`C Cl_(3)- NO_(2)`

Solution :Aliphatic `ALPHA`-amino acids form zwitter ions,
Discussion
16238.

The standard reduction potential of silver, chlorine , gold and copper are +0.80V , +1.36V , +1.42V , +0.34V respectively. The strongest oxidising agent will be

Answer»

silver
chlorine
gold
copper

Solution :Low `E_("RED")^(0)`-STRONGER OXIDISING agent.
Discussion
16239.

Write the structues of te product of the following reactons. (ii) (C_6H_5CH_2)_2Cd+2Ch_3COCl gives

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_008_S01##)`
Discussion
16240.

Which of the following compound will give butanone on oxidation with alkaline KMnO_(4) solution ?

Answer»

Butan-1-ol
Butan-2-ol
Both of these
NONE of these.

ANSWER :B
Discussion
16241.

The species present in solution when CO_(2) is dissolved in water are

Answer»

`CO_(2), H_(2)CO_(3), HCO_(3)^(-), CO_(3)^(2-)`
`H_(2)CO_(3), CO_(3)^(2-)`
`CO_(3)^(2-), HCO_(3)`
`CO_(2), H_(2)CO_(3)`

SOLUTION :`CO_(2) + H_(2)O hArr H_(2)CO_(3) hArr H^(+) + HCO_(3)^(-) harr H^(+) + CO_(3)^(-2)`
Discussion
16242.

The V-C distance in V(CO)_(6)" and "[V(CO)_(6)]^(-) are repectively (in pm) :

Answer»

200, 200
193, 200
200, 193
193, 193

Answer :C
Discussion
16243.

Which among the following is not and electrical property of colloids?

Answer»

Electrophoresis
Electro osmosis
Coagulation
Tyndall effect

Answer :A
Discussion
16244.

Write the order of reactivity of CH_3OH(I), C_2H_5OH(II), underset("OH")underset(""|)(CH_3CHCH_3) (III) towards metallic sodium.

Answer»

Solution :The ORDER of reactivity is:I> I > III .
The reactivity with SODIUM depends on ACIDIC nature of ALCOHOLS.
Discussion
16245.

What is the IUPAC name of the compound K_3[Fe(CN)_6]

Answer»

SOLUTION :POTASSIUM HEXACYANOFERRATE (III)
Discussion
16246.

The weight of a molecule of the compound C_(60)H_(122)is

Answer»

`1.4 xx 10^(-21)`G
`1.09 xx 10^(23)` g
`5.025 xx 10^(23)` g
`16.023 xx 10^(23)` g

Solution :1 mol of `C_(60)H_(122) = 60 xx 12 + 122 xx 1g = 842 g`
`6.023 xx 10^(23)` molecules weighs = 842 g
`THEREFORE` Wt. of one molecule `=1.4 xx 10^(-21)`g
Discussion
16247.

The repeating structural units in silicone is :

Answer»


`SiO_2`

SOLUTION :
Discussion
16248.

Two liquids 'A' (molecular mass =20) and 'B' (molecular mass =40) are partially miscible. When 1 mol of A, 3 mol of B are shaken together and allowed to settle, two layer 'M' and 'N' are formed as shown in diagram. Layer 'M' contains 0.2 mole fraction of 'A' and layer 'N' contain 0.6 mole fraction of A. Calculate the ratio of masses of layer M to layer N.

Answer»


SOLUTION :In layer `M`
`n_(A)=x n_(B)=y`
`x/(x+y)=0.2impliesy/x+1=5impliesy/x=4impliesy=4x`
In layer `N` LTBR. `((i-x))/((1-x)(3-y))=0.6`
`(3-y)/(1-x)+1=1/0.6implies(3-y)/(1-x)=4/6=2/3`
`=9-3y=2-2x`
`7=10ximpliesx=0.7, y=2.8`
`w_(M)=0.7xx20+0.7xx4xx40=14+7xx16=126`
`w_(N)=0.3xx20+0.2xx40=14`
`w_(M)//w_(N)=9`
Discussion
16249.

Which of the following carbonyl compounds will give recemisation reaction in the presence of acid base ?

Answer»

`CH_3-OVERSET(O)overset(||)C-CH_2-CH_3`
`CH_3-overset(O)overset(||)C-UNDERSET(CH_3)underset(|)overset(H)overset(|)C-C_2H_5`
`CH_3-overset(O)overset(||)C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-C_2H_5`
`CH_3-overset(O)overset(||)C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH_3`

ANSWER :B
Discussion
16250.

Which of the following can undergo nucleophilic addition reactions ?

Answer»

`CH_(3) CH_(2) CH_(3)`
`CH_(3) CH+CH_(2)`
`CH_(3) C=CH`
`CH_(2) =CH_(2)`

ANSWER :C
Discussion