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.

19951.

The value of equilibrium constant fro a feasible cell reaction is :

Answer»

` LT 1`
ZERO
`=1`
` GT 1`

ANSWER :D
Discussion
19952.

When ethanamide is boiled with aqueous NaOH, the gas evolved is :

Answer»

`NH_(3)`
`N_(2)`
`CO`
`CO,N_(2)`.

Answer :A
Discussion
19953.

What is meant by 'reducing sugars'?

Answer»

SOLUTION :A SUGAR which can act as reducing agent is CALLED reducing sugar. For example, GLUCOSE which is a reducing sugar, reduces Tollen.s reagent and Fehling.s solution .
Discussion
19954.

Which of the given mixed solutions will not lead to precipitation at 25^(@) water (Given: K_(sp)(CaF_2)=3.9xx10^(-11),K_(sp)[Zn(OH)_2]=4.5xx10^(-17), K_(sp)[Ag_2CrO_4]=9.0xx10^(-12) and K_(sp)[PbSO_4]=1.8xx10^(-8))-

Answer»

solution of `10^(-3)(M)Ca(NO_3)_2` and `10^(-3)(M)` NAF are mixed in equal volumes
solution of `10^(-3)(M)ZnCl_2` and `10^(-2)(M)` NaF are mixed in equal volumes
solution of `10^(-4)(M)AgNO_3` and `10^(-4)(M)` NaF are mixed in equal volumes
solution of `2xx10^(-4)(M)PB(NO_3)_2` and `10^(-3)(M)" "Na_2SO_4` are mixed in equal volumes

Answer :C
Discussion
19955.

When a solution of NaCl containing C_(2)H_(5)OH is electrolysedit forms :

Answer»

`C Cl_(4)`
`CHI_(3)`
`CH_(2)Br_(2)`
`C_(2)H_(5)OH`

Solution :Chloroform is manufactured by electrolysis of an aqueous solution of ethyl alcohol and sodium chloride.
`NaCl(aq)rarr NA^(+)(aq)+Cl^(-)(aq)`
`H_(2)O rarr H^(+)+OH^(-)`
At cathode :
`Na^(+)(aq)+E^(-)rarr Na(s), "" E_("RED")^(@)=-2.71 V`
`2H_(2)O+2e^(-)rarr H_(2)(g)+2OH^(-)(aq), "" E_("red")^(@)=-0.83 V`
At cathode `H_(2)` gas is liuberated due to greater reduction potential of `H^(+)` than `Na^(+)`.
At anode :
`Cl^(-)rarr Cl+1e^(-)`
`Cl+Cl rarr Cl , E_(oxd.)^(@)=-1.36 V`
`H_(2)O(l)rarr 2H^(+)(aq)+1//2O_(2)(g), E_(oxd.)^(@)=-1.23 V`
At anode `Cl_(2)` is liberated due to over voltage
`C_(2)H_(5)OH+5Cl_(2)+H_(2)Orarr CHCl_(3)+CO_(2)+7HCl`
Discussion
19956.

The variety of iron having highest melting point is:

Answer»

PIG iron
Cast iron
Wrought iron
Steel

Answer :C
Discussion
19957.

The stability of dihalides of Si,Ge, Sn and Pb increases steadily in the sequence :

Answer»

`SiX_(2) LT lt GE X_(2) lt lt PbX_(2)ltlt SnX_(2)`
`SiX_(2)ltltGe X_(2)ltltSnX_(2)ltltPbX_(2)`
`PbX_(2)ltltSnX_(2)ltltGeX_(2)ltltSiX_(2)`
`Ge X_(2)ltltSiX_(2)ltltSnX_(2)ltltPbX_(2)`.

Answer :B
Discussion
19958.

When tertiary butyl alcohol and 1-butanol are separately terated with a few drops of KMnO_(4) in one case only the purple colour disappers and a brown precipitte is formed. Which of the two alcohols gives the above reaction and what is that brown precipitate?

Answer»

Solution :1-Butanol, being PRIMARY alcohol gets oxidised by dilute `KMnO_(4)`. The brown PRECIPITATE is DUE to the formation of manganese DIOXIDE.
`underset("Manganese dioxide")(2KMnO_(4) + H_(2)O) to 3KOH + 2MnO_(2) + 3(O)`
`underset("1-butanol")(CH_(3)-CH_(2)-CH_(2)-CH_(2)OH overset(2(O))underset("roomtemp")to underset("butanoic acid")(CH_(3)CH_(2)CH_(2)COOH + H_(2)O)`
Discussion
19959.

The solvent that can dissolve all the carboxylic acids is

Answer»

WATER
dil. HCL
dil. NaOH
conc. `H_(2)SO_(4)`

Answer :C
Discussion
19960.

Two oxides of a certain metal were separately heated in a current of hydrogen until constant weights were obtained. The water produced in each case was carefully collected and weighed. 2 grams of each oxide gave respectively 0.2517 grams and 0.4526 grams of water. Show that these results established the Law of Multiple Proportions.

Answer»

Solution :Step 1. To calculate the mass of oxygen in each oxide.
Here, we are given :
Mass of each oxide = 2.0 g
Mass of WATER produced in case I = 0.2517 g
Mass of water produced in case II = 0.4526 g
18 g of water `(H_(2)O)` contain oxygen = 16 g
`THEREFORE"0.2517 g of water contains oxygen "=(16)/(18)xx0.2517g=0.2237g`
and 0.4526 g of water contains oxygen `=(16)/(18)xx0.4526g=0.4023g`
Step 2. To calculate the mass of oxygenwhich would combine with 1 g of metal in EAH oxide.
In case I. Mass of metal oxide = 2g
Mass of oxygen = 0.2237 g `therefore"Mass of metal "=2-0.2237=1.7763g`
`therefore" Mass of oxygen which combines with 1.7763 g of metal "=0.2237 g`
`therefore"Mass of oxygen which combines with 1 g of metal"=(0.2237)/(1.7763)g=0.1259g`
In case II. Mass of metal oxide = 2 g
Mass of oxygen = 0.4023 g `therefore"Mass of metal"=2-0.4023=1.5977g`
Mass of oxygen which combines with 1.5977 g of metal = 0.4023 g
`therefore"Mass of oxygen which combines with 1 g of metal "=(0.4023)/(1.5977)g=0.2515g`
Step 3. To compare the MASSES of oxygenwhich combine iwith the same mass of metal in the two oxides.
The masses of oxygen which combine with 1 g of metal in the two oxides are respectively 0.1259 g and 0.2513 g. These masses are in the ratio `0.1259:0.2515 or 1:2`
Since, this is a simple ratio, so the above results establish the Law of Multiple Proportions.
Discussion
19961.

Which of the following amino acids is a precursor for a mediator of allergies and inflammation ?

Answer»

HISTIDINE
Tryptophan
Tyrosine
PHENYL alanine

Solution :Histidine
Discussion
19962.

Which reagent among the following can affect the conversion ? CH_(3)-C equiv N rarr CH_(3)CH_(2)NH_(2)

Answer»

`H_(2)//Pt`
`LiAlH_(4)`
Amm. `AgNO_(3)`
`NaBH_(4)`.

SOLUTION :Both `H_(2)//Pt` and `LiAlH_(4)` can cause CONVERSION of `-C -= N RARR CH_(2) NH_(2)`
Discussion
19963.

The type of bonds present in sulphuric anhydride are

Answer»

<P>`3sigma ` and three `p PI-d pi`
`3sigma`, ONE `p pi-p pi` and TWO `p pi-d pi`
`2 SIGMA` and three `p pi-d pi`
`2sigma` and two `p pi-d pi`

Answer :B
Discussion
19964.

Which of the following is not an example of addition polymer ?

Answer»

POLYSTYRENE
POLYETHYLENE
POLYPROPYLENE
Terylene

Answer :D
Discussion
19965.

Which of the following diagram is correctly related to the extraction of Zn from calamine ?

Answer»




ANSWER :D
Discussion
19966.

What are point defects and stoichiometric defects?

Answer»

Solution : Point DEFECTS are the irregularities or deviations from ideal arrangement around a point or an atom in a crystalline substance, whereas stoichiometric defects are type of point defects that donot disturb the stoichiometry of the crystal STRUCTURE.
Stoichiometric defects are of two types :
(i) Vacancy defect and (ii) INTERSTITIAL defects
These two defects are shown by non-ionic solids. Ionic solids however, shows Schottky and Frenkel defects and they maintain electrical NEUTRALITY. The stoichiometric defects are also called INTRINSIC or thermodynamic defects.
Discussion
19967.

Which component is essential in sleeping pills?

Answer»

TRANQUILIZERS 
Narcotic analgesics 
ANTIBIOTICS 
ANTIMICROBIALS 

Solution :Tranquilizers
Discussion
19968.

Whenpropanoicacidis treatedwithaqueous sodiumbicarbonate, CO_(2)is liberated .TheC ofC CO_(2) comesfrom.

Answer»

carboxylic ACID GROUP
methylene group
bicarbonate
METHYL group

SOLUTION :Thus , carbon atoms of `CO_(2) ` COMES from bicarbonate .
Discussion
19969.

Thionyl chloride is preferred in the preparation of chloro compound from alcohol since

Answer»

Both the BYPRODUCTS are gases and they escape out LEAVING product in PURE state
It is a chlorinating agent
It is a oxidising agent
All other REAGENT are unstable

Solution :Both byproducts are gases:
Discussion
19970.

What criterion is followed for the selection of the stationary phase in chromatography ?

Answer»

Solution :In chromatography, the STATIONARY phase is SELECTED in such a way that the impurities are more STRONGLY adsorbed or gets more soluble in stationary phase than the substance to be purified. Thus, when the column is EXTRACTED, the impurities are retained by stationary phase.
Discussion
19971.

The standardreductionpotentials at 298 K for the followinghalf reactions are given against eath Zn^(2+)(aq)+2e^(-) rarr Zn(s),-0.762 V Cr^(3+)(aq)+3e^(-)rarrCr(s),-0.740 v 2H^(+)(Aq)+2e^(-)rarrH_(2)(g),0.00V Fe^(3+)(aq)+e^(-)rarrFe^(2+)(aq),0.770 V Whichis the strongestreducing agent

Answer»

ZN(s)
Cs(s)
`H_(2)(g)`
`FE^(3+)(aq)`

Solution :Lessthe reductionpotentialweaker is theoxidisingagentor strongeris thereducing AGENT
Discussion
19972.

Which of the following is true about gaseous state of matter?

Answer»

Thermal energy is EQUAL to molecular force of ATTRACTION
Molecular forces of attraction are higher in gases than those in liquids
Thermal energy is LOWER than molecular forces of attraction
Thermal energy is highly greater than molecular forces of attraction

Answer :D
Discussion
19973.

Write the name and structure of four isomeric amines having the molecular formula C_(3)H_(9)N.

Answer»

SOLUTION :(i) `CH_3-CH_2-CH_2NH_2""" 1-amino PROPANE "`
(II)
(III)
(IV)
Discussion
19974.

Which method is used to preserve food?

Answer»

PASTEURISATION & irration
chilling and freezing
drying and dehydration
all the above

Solution :all the above
Discussion
19975.

Three electrolytic cells A, B, C containing solutions of ZnSO_4, AgNO_3 and CuSO_4, respectively are connected in series. A steady current of 1.50 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited ? [At. weights of Cu = 63.5, Zn = 65.3, Ag = 108]

Answer»

Solution :`Ag^(+) + e^(-) to Ag`
1 mole or 108 G of Ag are deposited by 96500 C of electricity
`therefore 1.45`g of Ag will be deposited by `(96500)/108 xx 1.45C = 1295.6 `C
Time of FLOW of current is OBTAINED as under:
`Q = l xx t`
or `t = Q//l = 1295.6//1.50 = 863.7 s = 14` MIN 24 s
Masses of Cu and Zn deposited can be obtained as under:
`Cu^(2+) + 2e^(-) to Cu`
`2 xx 96500 C ` deposit = 63.5 g Cu
`therefore 1295.6` C will deposit `=63.5/(2 xx 96500) xx 1295.6 = 0.438 g`.
Discussion
19976.

Which of the following pairs are isodiapheric pairs ?

Answer»

`""_(29) Cu^(65)` and `""_(24) Cr^(55)`
`""_(29) Cu^(65)` and `""_(24) Cr^(52)`
`""_(92) U^(235)` and `""_(90) Th^(231)`
`""_(92) U^(238)` and `""_(90) Th^(231)`

Solution :I.T.N.O.= (A-2 Z) `implies` same
(a) `65 - 2 xx 29 = 65-58 = 7`
`55-2 xx 24 = 55 - 48 = 7`
(B)`52 -2 xx 24 = 52 - 48 = 4`
(c) `235 - 2 xx 92 = 235 - 184 = 51`
`231 - 2 xx 90 = 231 - 180 = 51`
(d) `238 - 2 xx 92 = 238 - 184 = 54`
`231 - 2 xx90 = 5`
Discussion
19977.

The result of (2.36 xx 0.07251)/(2.103) will contain the significant figures equal to

Answer»

three
four
two
seven

Solution :The NUMBER of significant figures in the ANSWER should not be GREATER than the LEAST pricse term i.e. 2.36
Discussion
19978.

Write the balanced chemical equation for the action of concentrated sulphuric acid on copper metal.

Answer»

SOLUTION :`Cu+2H_(2)SO_(4)rarrCuSO_(4)+SO_(2)+2H_(2)O`
Discussion
19979.

Which of the following statement is not true ?

Answer»

The Ellingham diagram SHOW the plots of `DeltaG` Vs T.
In FROTH floatation process depressants are added to ENHANCE the formation of froth.
Extraction of zinc oxide is DONE by coke
CO is more EFFECTIVE reducing agent below 983K.

Answer :B
Discussion
19980.

Which of the following statements is true on the basis of back bonding ?

Answer»

Si-O BOND is stronger than C–O bond
Dimethyl ether acts as a better lewis BASE but not disilyl ether `(SiH_(3)-O-SiH_(3))`
`(CH_(3))_(3) C-O-H` is less ACIDIC than `(CH_(3))Si-OH`
All of these

Solution :
Discussion
19981.

Which one of the following gases turn lime water milky ?

Answer»

`CO_2`
CO
`N_2`
`Cl_2`

ANSWER :A
Discussion
19982.

When heated to 800^(0)C, N_2Ogives.

Answer»

`NO+O_2`
`NO_2+O_2`
`N_2 + O_2`
None

Answer :C
Discussion
19983.

Which of the following compounds is the most basic ?

Answer»




ANSWER :B
Discussion
19984.

Which of the following ion is most effective for coagulation of positively charged colloid ?

Answer»

`SO_(4)^(2-)`
`Cl^(-)`
`PO_(4)^(3-)`
`[FE(CN)_(6)]^(4-)`

Answer :D
Discussion
19985.

Which of the following do not form addition compounds with ammonia:

Answer»

`HCHO`
`CH_3COCH_3`
`CH_3CHO`
none

Answer :A
Discussion
19986.

Which of the following reagent to get sp^(3) - hybridised carbon atom from sp^(2) - hybridised carbon stom ?

Answer»

`NH_(2) - NH_(2)`
`NH_(2) - CO-NH - NH_(2)`
`NH_(2) - NH_(2) //KOH`
`Nh_(2) OH`

Answer :C
Discussion
19987.

Which loses charge at catode:

Answer»

Ions
Cations
Anions
Both anoions and cations

Answer :B
Discussion
19988.

What product is formed by mixing the solution of K_(4)[Fe(CN)_(6)] with the solution of FeCl_(3)?

Answer»

Ferro-ferricyanide
Ferri-ferrocyanide
Ferri-ferricyanide
NONE of these

ANSWER :B
Discussion
19989.

Which metal is found in free state ?

Answer»

Iron
Platinum
Aliminium
Sodium

Answer :B
Discussion
19990.

What happens when white phosphorus is heated withNaOH solution in an inert atmosphere of CO_2 ?

Answer»

SOLUTION :PHOSPHINE is FORMED `P_4+3NaOH+3H_2Oto3NaH_2PO_2+PH_3`
Discussion
19991.

What are P and Q?

Answer»

SOLUTION :
`QtoCH_(5)CH_(2)CH_(3)`
Discussion
19992.

Which of the following is correct statement ? (a) AlCl_(3) is conducting in fused state (b) Mobility of Li^(+)ion in water is greater than Cs^(+)ion ( c) MCl_(2) is more volatile thanMCl_(4) (d) BeSO_(4) is more soluble in water than BaSO_(4)

Answer»

a,b
b,C,d
b,d
Only d

Answer :D
Discussion
19993.

Transition elements exhibit positive oxidation state only. This is because of :

Answer»

Their LARGE SIZE of the ATOMS
Their elecropositive nature
their ELECTRONEGATIVE nature
Their PARAMAGNETIC nature

Answer :B
Discussion
19994.

Write the order of intermolecular forces in neoprene, nylon 6 and PVC.

Answer»

Solution :Increasing ORDER of intermolecular FORCES is : `"neoprene"lt"polyvinylchloride"lt"nylon"6`. Neoprene rubber is cis-1,4-polychloroprene. It has very weak van der Waals forces.
Van der Waals forces are relatively stronger in polyvinylchloride, because of the presence of halogen atoms. Nylon 6 is a polyamide and hence van der Waals forces are EVEN stronger.
Discussion
19995.

Which oneof thefollowingis reducedwithZincandhydrochloricacidto givethecorrespondinghydrocarbon ?

Answer»

Ehtayl ACETATE
Acetic acid
ACETAMIDE
BUTAN -2- ONE

Answer :D
Discussion
19996.

Which statement is incorrect for transition metallic element?

Answer»

They POSSESS different oxidation state
Their all ions are coloured
They possess both paramagnetism and diamagnetism properties
They possess CATALITIC property

Answer :B
Discussion
19997.

The transfer RNA anticodon for the messenger RNA codon G-C-A is

Answer»

C-G-U
G-C-U
U-G-C
G-U-C

Answer :A
Discussion
19998.

Which of the following orbital can not form pi as well as delta-Bond ?

Answer»

`d_(XY)`
`d_(z^(2))`
`d_(x^(2)-y^(2))`
`d_(YZ)`

SOLUTION :`d_(z^(2))` can not form `pi` as WELL `delta` bond but it can form `sigma`-bond.
Discussion
19999.

Which of the following is/are steam volatile ? 1. p-nitrophenol 2. o-nitrophenol 3. a-hydroxy acetophenon 4. p-hydroxy acetophenone

Answer»

1, 4
2, 3
1, 3
3, 4

Answer :B
Discussion
20000.

Write the rate equation for the reaction 2A+BtoC if the order of the reaction is zero.

Answer»

Solution :RATE=`k[A]^(0)[B]^(0) therefore` Rate =K
The rate of this REACTION does not DEPENDS on CONCENTRATION of A ot B and rate=rate constant.
Discussion