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.

18551.

Which of the following statement is wrong with respect to metallic or electronic conductivity ?

Answer»

metallic conductivity is depend on STRUCTION and its characteristic.
Conductivity increases with INCREASE in TEMPERATURE.
Metallic conductivity depends on NUMBER of valence electron present in valence cell.
No CHANGE is observed in struction of metal during conduction of current.

Solution :Conductivity increases with increase in temperature.
Discussion
18552.

Which of the following is a free radical Halogenation reactiobn ?

Answer»

Benzene converted to Bromobenzene
PHENOL converted to CHLOROBENZENE
Benzene DIAZONIUM CHLORIDE converted to chlorobenzene
Propane converted to 1-chloropropane and 2-chloropropane

ANSWER :D
Discussion
18553.

What are the uses oflead accumulator ?

Answer»

Solution :A lead ACCUMULATOR is USED (i) in automobiles for the SUPPLY of electric current (ii) in the laboratories as a D.C. supply (iii) in telephone and TELEGRAPH SYSTEMS. (iv) also in invertors.
Discussion
18554.

Which of the following IUPAC names are incorrect.

Answer»




SOLUTION :N//A
Discussion
18555.

Which are monomers of polymer having structure (NH - CO - NH – CH_(2))_(n) ?

Answer»

ACETAMIDE, FORMALDEHYDE
Acetamide, Methenamine
UREA, Formaldehyde
Urea, AMMONIA

SOLUTION :Urea, Formaldehyde
Discussion
18556.

Total number of.bonds in NH_(3) is ......

Answer»


Solution :`N_3H`- Hydrazoic ACID `barNoverset(PI)UNDERSET(sigma)(=)overset(+)Noverset(pi)underset(sigma)(=)Nunderset(sigma)-H` No. of sigma bonds = 3
Discussion
18557.

Write the IUPAC name of the compound CH_(3)-C-=C-CHClCH_(3).

Answer»

SOLUTION :.
Discussion
18558.

Which of the follwing is least soluble in water :

Answer»

`C_2H_5OH`
`C_3H_7OH`
`C_4H_9OH`
`C_5H_(11)OH`

ANSWER :D
Discussion
18559.

When NaOH solution is gradually added to the solution of weak acid (HA), the pH of the solution is found to be 5.0 at the addition of 10and 6.0 at further addition of 10 ml of same NaOH. (Total volume of NaOH =20ml). Calculate pK_(a) for HA. [log2 = 0.3]

Answer»


Solution : Let INITIAL com HA and NAOH be `c_(1)` and `c_(2)` and initial volume of `HA=v_(1)ML`
`5=pK_(a) + "LOG"(10C_(2))/((c_(1)v_(1) – 10c_(2)))` ……(i)
`6=pK_(a) + "log"(20C_(2))/((c_(1)v_(1) – 20c_(2)))` ……(ii)
`c_(1)v_(1)=22.5c_(2)`
`5=pK_(a) + "log"(10c_(2))/(22.5c_(2) – 10c_(2)) = pK_(a) + log0.8 IMPLIES pK_(a)=5+0.096=5.1`
Discussion
18560.

Which of the following is/are not correct?

Answer»

Loss of `beta-`PARTICLE produces an isotope.
Loss of ONE `alpha` and `beta`- PARTICLES produces an isotope.
Loss of mass takes place only during nuclear FISSION or fusion
Uranium is a transuranic element.

Solution :Loss of mass takes places in every nuclear REACTION. Uranium itself is not a transuranic element.
Discussion
18561.

Which ofthefollowingbenefactionprocesses isused frothe mineral,Al_ 2 O_ 3.2 H_ 2 O?

Answer»

FROTHFLOATATION
LEACHING
LIQUATION
Magneticseparation.

ANSWER :B
Discussion
18562.

What are Bravais Lattices ?

Answer»

Solution :In all, FOURTEEN DIFFERENT types of LATTICES are possible, which are CALLED Bravais lattices
Discussion
18563.

Which consists of only one element ?

Answer»

Marble
Sand
Diamond
Glass

Answer :C
Discussion
18564.

Which reaction is least feasible

Answer»




ANSWER :C
Discussion
18565.

Which of the following represents soap

Answer»

`C_(17)H_(35)COOK`
`C_(15)H_(31)COOH`
`C_(17)H_(35)COOH`
`(C_(17)H_(35)COO)_(2)Ca`

SOLUTION :Soaps are the SODIUM or potassium SALT of higher fatty acids e.g., `C_(17)H_(27)COOK` (Potassium stearate). These are obtained by alkaline hydrolysis of oils and fats. The reaction is called saponification.
Discussion
18566.

The strongest base and nucleophile among the following is:

Answer»

`NH_4^+`
`:NH_3`
`:overset-NH_2`
`:overset-OH`

ANSWER :C
Discussion
18567.

Which of the following reagents would be best for converting phenylacetamide (C_(6)H_(5)CH_(2)CH_(2)NH_(2))?

Answer»

`H_(2)` & Pt catalyst
`NaBH_(3)CN`
`LiAlH_(4)` in ether
Aqueous NaOBr

Solution :Amides on `"RED"^(n)` with `LiAlH_(4)` gives amines
Discussion
18568.

What is the value of Van't Hoff's factor (i) for K_2SO_4 ?

Answer»

Solution :i=3(Two `K^+` and ONE `SO_4^(-2)` ) GREATER than one `(IGT 1)`
Discussion
18569.

Write the formula of the following coordination compound Tris(ethane-1,2-diamine)chromium(III)chloride

Answer»

SOLUTION :`[CR(EN)_3)]Cl_3` or `[Cr(H_2N CH_2 CH_2NH_2)_3]Cl_3`
Discussion
18570.

Which one of the following is correctly matched ?

Answer»

Aerosol-hair CREAM
Gel-butter
Foam-mist
Sol-whipped cream

ANSWER :B
Discussion
18571.

Which of the following is a carbohydrate

Answer»

Leucine
Albumin
Inulin
Maltase

Solution :Insulin is a CARBOHYDRATE which is STORED in "Root SOF DAHLIYA".
Discussion
18572.

Why are solid rigid?

Answer»

SOLUTION :In solids the constituent particles (ATOMS, ions or molecules) are closely packed and not FREE to move. So solids are RIGID.
Discussion
18573.

What is the potential of the cell containing two hydrogen electrodes as represented below?PT,1/2H_2(g)|H^+(10^-8M)||H^+(0.001M)|1/2H_2(g)Pt:

Answer»

`-0.295V`
`-0.0591V`
`0.295V`
`0.0591 V`

ANSWER :C
Discussion
18574.

Which of the following compounds are soluble in water ?

Answer»

`CaC_(2)O_(4)`
`SrSO_(4)`
`BaCI_(2)`
`(NH_(4))_(2)C_(2)O_(4)`

ANSWER :c,d,
Discussion
18575.

Which reagent will convert propionic acid to propanol-1:

Answer»

`KMnO_4`
`LiAIH_4`
`Cr_2O_3`
`MnO_2`

ANSWER :B
Discussion
18576.

What is a group reagent ?

Answer»

Solution :The reagent which is employed in idntifying a gourp of RADICALS is known as GROUP reagent.
Discussion
18577.

which is paramagnetic and has bond order 0.5 ?

Answer»

`H_2^+`
`F_2`
`N_2 `
`O_2`

ANSWER :A
Discussion
18578.

What happens when calcium acetate is dry distilled?

Answer»

Solution :When CALCIUM ACETATE is DRY distilled, acetone is FORMED.
Discussion
18579.

Which of the following numbers has three significant figures ?

Answer»

0.009
`321.00`
1023
`0.0300`

ANSWER :D
Discussion
18580.

Which of following has similar glycosidic bond

Answer»

MALTOSE and lactose
maltose and cellobiose
amylose and amylopectin
maltose and amylose

Answer :D
Discussion
18581.

Which of the followinghaslowest B.P

Answer»

`CH_(3) - CH_(2)-CH_(2) - NH_(2)`
`CH_(3) - underset(NH_(2))underset(|)(CH) - CH_(3)`
`C_(2)H_(5)-NH-CH_(3)`
`(CH_(3))_(3)N`

ANSWER :D
Discussion
18582.

The solubility of inert gases in water is due to

Answer»

Keesom ATTRACTION
Debye attraction
London force
Ion-dipole attraction

Solution :INERT gas `+ H_(2)O RARR` dipole-induced dipole(Debye attraction)
Discussion
18583.

Which of the following is explosive?

Answer»




NONE of these

ANSWER :B
Discussion
18584.

When an orange coloured crystalline compound (A) was heated with common salt and concentrated sulphuric acid an orange-yellow coloured gas (B) was evolved. The gas (B) when passed through caustic soda solution gave a yellow solution (C) which in turn gave the following reactions. (i) Addition of silver nitrate solution to (C) gave first a white precipitate which then turns red. Quantitatively, 0.155 g of the gas (B) required 2.0 m moles of AgNO_(3) to produce the first trace of red colour. (ii) Acidification of the solution (C) with dil. H_(2)SO_(4) gave an orange solution which contained chromium in +6 oxidation state. The solution liberated iodine from aqueous potassium iodide, leaving a green solution containing chromium in +3. oxidation state. Quantitatively, 0.155 g of the gas (B) liberated 1.5 m moles of iodine. Deduce the formula of A, B and C and explain the reactions.

Answer»

Solution :Let us summarize the given reactions.
The above set of reactions INDICATES that compound A is `K_(2)Cr_(2)O_(7)`, B is chromyl chloride gas and C is sodium chromate which explains all the given reactions as below.
`underset(A("Orange crystals"))(K_(2)Cr_(2)O_(7))+4NaCl+6H_(2)SO_(4)to4NaHSO_(4)+2KHSO_(4)+underset("B(Orange)")(2CrO_(2)Cl_(2))uarr+3H_(2)O`
`CrO_(2)Cl_(2)+4NaOHtounderset(C(Yellow))(Na_(2)CrO_(4))+2NaCl+2H_(2)O`
`Na_(2)CrO_(4)+2AgNO_(3)tounderset(Red)(Ag_(2)CrO_(4))darr+2NaNO_(3)`
`2Na_(2)CrO_(4)+H_(2)SO_(4)toNa_(2)Cr_(2)O_(7)+Na_(2)SO_(4)+H_(2)O`
`Cr_(2)O_(7)^(2-)+14H^(+)+6l^(-)to2Cr^(3+)+7H_(2)O+3l_(2)`
The quantitative data is explained in the following manner. From the above reactions we observe that
`underset(155g)(CrO_(2)Cl_(2))=Na_(2)CrO_(4)=underset("2 moles")(2AgNO_(3))`
155g of `CrO_(2)Cl_(2)` require 2 moles of `AgNO_(3)`
0.155g of `CrO_(2)Cl_(2)` will require =`(2)/(155)xx0.1555=0.002 "moles" = 2m "moles"`
This coincides with the given data.
Similarly,`underset(2xx155)(2CrO_(2)Cl_(2))-=2CrO_(4^(2-))-=Cr_(2)O_(7)^(2-)-=underset("3 moles")(3l_(2)`
Thus,`2xx155g` of `CrO_(2)Cl_(2)` liberate 3 moles of `l_(2)`
0.155g `CrO_(2)Cl_(2)` will liberate =`(3xx0.155)/(2xx155)=0.0015 "moles" =1.5m "moles"`
This also coincides with the given data.
Discussion
18585.

ZnS containing minute traces of MnS becomes :

Answer»

DELIQUESCENT
PHOSPHORESCENT
Hydroscopic
NONE

ANSWER :B
Discussion
18586.

The solubility of a gas in liquid at a temperature is directly proportional to its

Answer»

DENSITY
Melting point
BOILING point
PRESSURE

Solution :Amount of gas dissolvedper unit volumeprop pressure of gas. This is Henry's LAW.
Discussion
18587.

Which of the following reactions of propyne is electrophilic in nature ?

Answer»

`H_(2)O`
`CH_(3)OH`
HCN
HOCl

Solution :Only ALKYNES containing terminal hydrogen are ACIDIC.
Discussion
18588.

Which of the following alcohol is most reactive with HCl in presence of anhydrous Zinc chloride at room temperature ?

Answer»

`CH_(3)-CH_(2)-CH_(2)-OH`
`(CH_(3))_(3)-C-OH`
`(CH_(3))_(3)-C-CH_(2)OH`
`(CH_(3))_(2)CH-OH`

Solution :The REACTION with HCl in presence of anhydrous `ZnCl_(2), SN^(1)`, substitution. This reaction is fastest in `3^(@)`-alcohols.
`underset(3^(@)-"alcohol")((CH_(3))_(3)C-OH) +HCl underset(ZnCl_(2))OVERSET("Anhydrous")to underset(3^(@)-"butyl chloride")((CH_(3))_(3)C-Cl+H_(2)O)`
`3^(@)`- alcohols `gt 2^(@)` - alcohols `gt 1^(@)` - alcohols `larr` Rate of `SN^(1)` REACTIONS `larr`
Discussion
18589.

Which of the following statement is incorrect regarding physissorptions?

Answer»

More EASILY liquefiable gases are adsorbed readily.
Under high high pressure it results into multi MOLECULAR layer on adsorbent surface
Enthalpy of ADSORPTION `(DeltaH_("adsorption"))` is low and positive
It OCCURS because of VAN der Waal's forces

Solution :Since adsorption is exothermic process so `DeltaH` of adsorption is always negative.
Discussion
18590.

What is synthetic gas?

Answer»

Solution :A MIXTURE of carbonmonoxide and HYDROGEN is called SYNTHETIC GAS.
Discussion
18591.

Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol?

Answer»

Solution :RESONANCE STRUCTURES of aniline :

Action of benzene DIAZONIUM CHLORIDE on ethanol :
Discussion
18592.

Which complex cannot ionise in solution?

Answer»

`[CoCI_(3)(NK_(3))_(3)]`
`K_(4)[Fe(CN)_(6)]`
`K_(2)[Pt(F_(6)]`
`[Pt(NH)_(3))_(6)]CI_(4)`

Solution :`[CoCI_(3)(NH_(3))_(3)]` cannot ionise in solution as it is non-electrolyte as the `CI^(-)` PRESENT in the coordination sphere are not ionizable.Therefore do not FURNISH ions in solution.
Discussion
18593.

Which of the following is used in dating archeological findings or In a method of absolute dating of fossils a radioactive element is used. It is

Answer»

`._((2)U^(235)`
`._(6)C^(14)`
`._(6)C^(12)`
`._(20)CA^(40)`

Solution :`._(6)C^(14)` is used in DATING archeological findings
Discussion
18594.

Which of the following property is not expected to be shown by copper

Answer»

HIGH THERMAL conductivity
Low ELECTRICAL conductivity
Ductility
Malleability

Answer :B
Discussion
18595.

Which of the following pollutant is released in large quantity from the exhaust emission of a petrol/diesel automobile

Answer»

CO
`CO_2`
`NO_2, SO_2` and Pb
Hydrocarbons

Solution :COreleased in incomplete combustion of petroleum products and AUTOMOBILES is RESPONSIBLE for production of 74% of TOTAL man made CO in atmosphere.
Discussion
18596.

Very low concentrations of SO_2 acts as

Answer»

ANTIFERTILITY drug
Artificial SWEETENING agent
Disinfectant
ANTISEPTIC

ANSWER :C
Discussion
18597.

Which gas will be evolved out when [CH_(3)CH_(2)NH_(2)+(CH_(3))_(2)CHNH_(2)] is treated with sodium nitrite and HCl?

Answer»

Chlorine
AMMONIA
Nitrogen
`NO_(2)`

Answer :C
Discussion
18598.

Which statements are correct regarding copper sulphate ?

Answer»

It reacts with NaOH and Glucose to give `Cu_(2)O`
It reacts with KCl to give `Cu_(2)O`
It GIVES CUO on strong heating in air
It reacts with KI to give brown colouration

Solution :`underset((M))(Z)OVERSET(dlHNO_(3))(rarr)underset("Colourless solution")(Zn(NO_(3))_(2))underset(NaOH)overset(Ag)(rarr)underset("White PPT")(Zn(OH)_(2))underset(NaOH)overset("EXCESS")(rarr)underset("Soluble")(Na_(2)[Zn(OH)_(4)])overset(H_(2)S)(rarr)underset("Whiteppt")(Zns)`
Discussion
18599.

Which is not a purely surface phenomena:

Answer»

SURFACE tension
adsorption
absorption
none of these

Answer :C
Discussion
18600.

Three thermochemical equations are given below(1)C_(("graphite"))+O_(2)(g)rarrCO_(2)(g), Delta_(r) H^(@)=xkJ mol^(-1)(2)C_("graphite")+1//2O_(2)(g)rarrCO(g), Delta_(r)H^(@)=y kJ mol^(-1)(3)CO(g)+1//2O_(2)(g)rarrCO_(2)(g), Delta_(r)H^(@)=zkJ mol^(-1) Based on the above equations, find out which of the relationship given below is correct

Answer»

Z=X+y
x=y+z
y=2z-x
x=y-z

Solution :Applying Hess's law
`C_((g))+O_(2)rarrCO_(2(g))"x kJ mol"^(-1)"....(i)"`
`{:(ul(C_((s))+(1)/(2)O_(2)rarrCO_((g))"y kJ mol"^(-1))"...(ii)"),(O_(2)-(1)/(2)O_(2(g))rarrCO_(2(g))-CO_((g))z kJ mol^(-1)"....(III)"):}`
On substracting eq. (i) and (ii) we get
`CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g)) thereforex-y=zimpliesx=y+z`
Discussion