Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following atatements are correct for above rreaction ?

Answer»

number of possible enolates are four
moststable enolate is

enol with least stearic HINDERENCE ISMOST stable

is the MAJOR aldol.

Solution :aldol CONDENSATION.
Discussion
2.

Which is used as an antifreeze ?

Answer»

Glycol
Ethyl alcohol
Water
Methanol

Answer :A
Discussion
3.

Which of the following can NOT change the colour of litmus paper

Answer»

DIL `H_2SO_4` solution
PURE `H_2O_2`
dil NAOH solution
`CH_3COOH`

Solution :Pure `H_2O_2` is weak acid but NEUTRAL to litmus paper
Discussion
4.

What is the mass of the precipitate formed when the preparation of alkyl halides 50 ml of 16.9% solution of AgNO_(3) is mixed with 50 ml of 5.8 % NaCl solution?

Answer»

7g
14g
28g
35g

Solution :`UNDERSET(0.0497 MOL)underset(darr)underset(8.45g)underset(darr)underset(16.9%xx50ml)(AgNO_(3)) + underset(0.0497 mol)underset(darr)underset(2.90)underset(darr)underset(5.8xx50)(NACL) to AgCl darr + NaNO_(3)`
`0.0497 molxxunderset(AgCl)(143.32)=7.11 g`
Discussion
5.

Write notes on Interstitial Hydrides.

Answer»

Solution :Interstitial Hydrides : Metallic hydrides usually obtained by HYDROGENATION of metals and alloys in which hydrogen occupies the interstitial sites (VOIDS). Hence, they are called interstitial hydrides. These hydrides show properties similar to PARENT metals and hence they are also known as metallic hydrides . Most of the hydrides are non-stoichiometric with variable composition `(TiH_(1.5-1.8)and PdH_(0.6-0.8))`, some are relatively light, inexpensive and thermally unstable which makes them useful for hydrogen storage APPLICATIONS.
Discussion
6.

Which of the following does not participate in the Solvay's process for the manufacture of Na_(2)CO_(3)?

Answer»

`NH_(3)`
`NACL` SOLUTION
`CO_(2)`
`H_(2)SO_(4)`

ANSWER :D
Discussion
7.

Write structures of different isomers corresponding to the 5th member of alkyne series. Also write IUPAC names of all the isomers. What type of isomerism is exhibited by different pairs of isomers ?

Answer»

Solution :The molecules FORMULA of the 5th MEMBER of the ALKYNE series is `C_6H_10`. The possible isomers and their IUPAC names are :

POSITION isomers . (i) and (ii) , (i) and (III) , (ii) and (iii), (v) and (vi)
Chain isomers . (i) and (iv) , (i) and (v) , (i) and (vi), (i) and (vii) , (ii) and (iv) , (ii) and (v), (ii) and (vi), (ii) and (vii) , (iii) and (iv) , (iii) and (v) , (iii) and (vi) , (iii) and (vii) , (iv) and (v) , (v) and (vii)
Discussion
8.

Which of the following will dissolve in aqueous Na_(2)CO_(3) ?

Answer»

PHENOL
2,4,6-Trimethylphenol
2,4,6-Trinitrophenol
2,4-Dinitrophenol

Solution :Phenol is less ACIDIC than `H_(2)CO_(3)`. As such phenol does not dissolve in aqueous `Na_(2)CO_(3)`. However, PRESENCE of electron WITHDRAWING group `(-NO_(2))` makes it more acidic. Thus 2, 4-dinitrophenol and 2,4,6-trinitrophenol are more acidic than `H_(2)CO_(3)` and as such dissolve in `Na_(2)CO_(3)` to diaplce weaker acid `H_(2)CO_(3)`.
Discussion
9.

What are major differences between metals and non-metals?

Answer»

SOLUTION :
Discussion
10.

Two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume is 10 litres. How much heat is absorbed and how much work is done in the expansion?

Answer»

Solution :We have `q=-W=p_(ex)(10-2)=0(8)=0 (W_("FREE EXPANSION"=0))`
Discussion
11.

Which of the following is an example of aryl alkyl halide?

Answer»

BENZYL CHLORIDE
Benzoyl chloride
Chloro benzene
Methyl chloride

Solution :Benzyl chloride
Discussion
12.

Which one of the following does not undergo sublimation ?

Answer»

Iodine
water
Camphor
AMMONIUM CHLORIDE

Solution :Water
Discussion
13.

What is weed killers ? Give an example .

Answer»

Solution :HERBICIDES are the chemical compounds used to control unwanted plants. They are otherwise known as weed killers. Example sodium CHLORATE `(NaClO_3)` and sodium arsenite `(na_2 AsO_3)` . Most of the herbicides are TOXIC to MAMMALS.
Discussion
14.

Which of the following reaction is an example of elimination reaction :

Answer»

`CH_3-CHOunderset(H_2O)OVERSET(CH_3MgBr)to CH_3-undersetunderset(OH)(|)CH-CH_3`
`CH_3-undersetunderset(OH)(|)CH-CH_3underset(Delta)overset(Conc. H_2SO_4)to CH_3-CH=CH_2`
`CH_3-CH_2-OH overset(PBr_3)to CH_3-CH_2-Br`
`CH_3-CH_2-COOH overset(NaNH_2)to CH_3-CH_2-COONa+NH_3`

Answer :B
Discussion
15.

Which of the following has large size

Answer»

Al
`Al^(+)`
`Al^(2+)`
`Al^(3+)`

SOLUTION :NATURAL ATOM has large size.
Discussion
16.

Which of the following properties of alkali elements shows their weak bond in solid state ?

Answer»

LOW BOILING POINT and high ELECTRIC conductivity.
Low melting point
High melting point
Low electric conductivity

Answer :A
Discussion
17.

The source of CO_2 in the atmosphere is

Answer»

COMBUSTION of FUEL
FERMENTATION
RESPIRATION
All the above

Solution :Combustion of fuel, Fermentation, Respiration
Discussion
18.

Using the standard electrode potentials given in the Table-8.1, predict if the reaction between the following is feasible : (a) Fe_((aq))^(3+)andI_((aq))^(-) (b) Ag_((aq))^(+)andCu_((s)) ( c) Fe_((aq))^(3+)andCu_((s)) (d) Ag_((s))andFe_((aq))^(3+) (e) Br_(2(aq))andFe_((aq))^(2+)

Answer»

Solution :(a) `Fe_((aq))^(3+)andI_((aq))^(-)` probable REACTION …
`2Fe_((aq))^(3+)+2I_((aq))^(-)to2Fe_((aq))^(2+)+I_(2(s))`

Value of `E^(@)` is POSITIVE, therefore reaction is possible.
(b) `Ag_((aq))^(+)+Cu_((s))` Probable reaction is
`2Ag_((aq))^(+3)+Cu_((s))to2Ag_((s))+Cu_((aq))^(+2)`

Value of `E^(@)` positive, therefore reaction is possible.
( c) `Fe_((aq))^(+3)+Cu_((s))` posiible reaction between them.

Value of `E^(@)` positive therefore reaction is possible.
(d) `Ag_((s))+Fe_((aq))^(+3)` possible reaction between them.

`E^(@)` is negative so reaction is not possible.
(e) `Br_(2(aq))+Fe_((aq))^(+2)` possible reaction between them.

`E^(@)` is positive, therefore reaction is possible.
Discussion
19.

Which of the following reaction involves homogeneous reduction ?

Answer»

`CH_(2)=CH_(2) OVERSET(H_(2)//NI)rarr CH_(3)-CH_(3)`
`CH_(3)-C-=C-CH_(3) overset("Wilkison's catalyst")rarr CH_(3)-CH=CH-CH_(3)`
`CH_(3)COCl overset(H_(2)//Pd//CaCO_(3)//"quinonline")rarr CH_(3)CHO`
`CH_(3)C-=CH overset(H_(2)//Pd//CaCO_(3)//"quinonline")rarr CH_(3)CH=CH_(2)`

Solution :Reduction with Wilkinson's catalyst is homogeneous
Discussion
20.

Which of the following given sets of quantum numbers are consistent with the theory ?

Answer»

`n = 2, l = 1, m = 0, s = +(1)/(2)`
`n = 4, l = 3, m = 2, s = - (1)/(2)`
`n =3, l = 2, m = 3, s = +(1)/(2)`
`n = 4, l = 3, m = 3, s = +(1)/(2)`

ANSWER :A::B::D
Discussion
21.

The standard molar entropy of H_(2) O_((l)) is 70 "JK"^(-1) "mol"^(-1). Will the standard molar entropy of H_(2) O_((s)) be more, or less than 70 "JK"^(-1) "mol"^(-1) ?

Answer»

Solution : The standard MOLAR entropy of `H_(2) O_((l))` is 70 `JK^(-1) "mol"^(-1)`.
The SOLID form of `H_(2) O` is ice. In ice, molecules of `H_(2)O` are LESS random than in LIQUID water.
Thus, molar entropy of `H_(2) O_((s)) lt` molar entropy of `H_(2) O_((l))`. The standard molar entropy of `H_(2) O_((s))` is less than `70 "JK"^(-1) "mol"^(-1)`.
Discussion
22.

Three-centre two-electron bonds are present in

Answer»

`NH_(3)`
`B_(2)H_(6)`
`BCl_(3)`
`AlCl_(3)`

Solution :`B_(2)H_(6)` has TWO `3c-2e` bonds.
Discussion
23.

When 6.3 g of sodium bicarbonate is added to 30 g of acetic acid solution, the residual solution is round to weigh 33 g. The number of moles of carbon dioxide released in the reaction is

Answer»

3
0.75
0.075
0.3

Solution :
The AMMOUNT of `CO_(2)` RELEASED, x=3.3g
No. of MOLES of `CO_(2)` released =3.3/44=0.75 MOL
Discussion
24.

Using s, p, d notations, describe the orbital with the following quantum numbers : (a) n=1, l=0 (b) n=3, l=1 (c) n=4, l=2 (d) n=4, l=3.

Answer»

Solution :(a) 1s (B) 3P (C) 4D (d) 4f.
Discussion
25.

The substance which can be used as adsorbent in column chromatography is

Answer»

`Na_(2)O`
`Na_(2)SO_(4)`
`Al_(2)O_(3)`
`NACL`

ANSWER :C
Discussion
26.

Which of the following are formed in the process of estimation of phosphorus

Answer»

`H_(3)PO_(4)`
`MgNH_(4)PO_(4)`
`Mg_(2)P_(2)O_(7)`
`(NH_(4))_(3)PO_(4)`

Solution :Organic compound (containing p)
Discussion
27.

Which of the following expressions is correct?

Answer»

`Delta G^(@) = - nFE^(@)`
`Delta G^(@) = + nFE^(@)`
`Delta G^(@) = - 2.303 RT ln FE_("cell")^(@)`
`Delta G^(@) = - nF log K_(C)`

Solution :`Delta G^(0) = - nFE_("cell")^(@) "& " Delta G^(0) = - RT` ln K
Discussion
28.

What is the pressure at Kolkata, Chennai and Mumbai at 0^(@)C temperature ?

Answer»

Solution :These THREE cities near SEA AREA of its NORMAL pressure will be 1 bar at 273.15 K its standard pressure.
Discussion
29.

What are colligative properties?

Answer»

Solution :The properties which do not depend on the chemical nature of the solute but DEPENDS only on the number of solute particles present in the solution are called colligative properties e.g.,
(i) Relative LOWERING of vapour PRESSURE `- (P ^(@) P)/(P^(@))`
(ii) Osmotic pressure `-pi`
(iii) Elvation of boiling point `-DELTA T_(b)`
(iv) Depression in FREEZING point `- Delta T _(r).`
Discussion
30.

What is the oxidation number of Mn is MnO_(4)^(-)?

Answer»

Solution :Mn in `MnO_4^(-)` , Let the oxidation number of Mn in `MnO_4^(-)` be X. WRITING oxidation number of each atom above its symbol, we get,
`OVERSET(x)(Mn)overset(-2)O_4i.e., x+4(-2)=-1i.e., x=+7`
Thus, the oxidation number of Mn in `MnO_4^(-)` is +7
Discussion
31.

What is the oxidation number of iron in the brown ring complex compound?

Answer»

Solution :The BROWN RING COMPLEX compound is given as : `[Fe(H_(2)O)_(5)NO] SO_(4)`
The complex ion is `[Fe(H_(2)O)_(5)NO]^(2+)`
Oxidation NUMBERS of `H_(2)O` is zero and `NO` is `+1`.
Oxidation STATE of Fe is `+1`
Experimentally, the number of unpaired electrons also support `+1` state of Fe (but not `+2` state).
Discussion
32.

Which one is the most toxic ?

Answer»

CARBON
CO
`CO_(2)`
`SO_(2)`

SOLUTION :CO is more TOXIC than carbon `CO_(2) and SO_(2)`
Discussion
33.

Which has maximum entropy change of vaporisation?

Answer»

WATER (L)
toluene(l)
DIETHYL ether (l)
acetone (l)

Solution :Max. `Delta S RARR` Max. `Delta H`
Discussion
34.

Tropolone is an example of

Answer»

benzenoid AROMATIC COMPOUND
non-benzenoid aromatic compound
alicyclic compound
acyclic compound

Solution :TROPOLONE is an EXAMPLE of non-benzenoid aromatic compound
Discussion
35.

What kind of compounds can be dissolved and hydrolysed in water?

Answer»

Solution :Water can easily dissolve all IONIC COMPOUNDS. Due to H-b onding with polar molecules, even COVALENT molecules like alco hols and carbohydrate dissolve in water. Water can hydrolyse MANY metallic and non-metallic oxides, hydrides, phosphides and other salts.
`P_4O_(10(s))+6H_2Oto4H_3PO_(4(AQ))`
Discussion
36.

Which of the following does not exist infree state

Answer»

`BF_(3)`
`BCl_(3)`
`BBr_(3)`
`BH_(3)`

Solution :`BH_(3)` exists as a DIMER i.e, `B_(2)H_( 6)`.
Discussion
37.

The volume of methane at N.T.P formed from 8.2g of sodium acetate by fusion with soda lime is

Answer»

10 l
11.2 l
5.6 l
2.24 l

Solution :`2CH_(3)COONaoverset("ELECTROLYSIS")toCH_(3)-CH_(3)`
Discussion
38.

Why are rare gases are mono atomic?

Answer»

Solution :RARE GASES process OCTET structure i.e., 8-electrons in the outer most orbit. They have no TENDENCY to react.
Discussion
39.

Which one of the following sets of quantum numbers is not possible for an electron in the ground state of an atom with atomic number 19 ?

Answer»

Quantum number were proposed out of NECESSITY in Bohr model of the atom.
Knowing n and l it is possible to DESIGNATE a subshell.
The PRINCIPAL quantum number alone can GIVE the complete energy of an electron in any atom.
Azimutal quantum number refers to the subshell to which an electron belongs and describes the motion of the electron.

Solution :Quantum numbers are taken to designate .
In multi `e^-` system , `l , m_l` also required E describes SHAPE.
Discussion
40.

What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm ?

Answer»

Solution :When temperature and PRESSURE of a gas is 273.15 K and 1 atm, they are known as standard temp. and pressure conditions (STP). Due to this volume occupied by 1 mole of each and every gas is 22.4 L. HENCE, the molar volume of `N_(2)` and Ar at 273/15 K and 1 atm is 22.4 L.
Discussion
41.

The reagent used for softening the temporary harness of water is

Answer»

Only a & B
Only b & d
Only b & C
Only a & d

ANSWER :C
Discussion
42.

Which of the following compounds exhibits Tautomerism

Answer»




SOLUTION :
Discussion
43.

When vapour of an alcohols are passed over hot reduced copper, alcohol is converted into alkene the alcohol is

Answer»

Primary
Secondary
Tertiary
None of these

Solution :
Discussion
44.

Which of the following acts as a reducing agent ?

Answer»

`CO`
`CO_(2)`
`C_(3)O_(2)`
All 

ANSWER :A
Discussion
45.

Which of the following oxids is acidic in nature ?

Answer»

`B_(2)O_(3)`
`Al_(2)O_(3)`
`Ga_(2)O_(3)`
`In_(2)O_(3)`

Answer :A
Discussion
46.

Which of the following carboxylic acids undergoes decarboxylation on heating ?

Answer»

`C_(2)H_(5) - CO - CH_(2)COOH`
`C_(2)H_(5) - CO - COOH`
`C_(2)H_(5) - underset(OH)underset(|)(CH) - COOH`
`C_(2)H_(5) - underset(NH_(2))underset(|)(CH) - COOH`

SOLUTION :See A-Level Information of carboxylic acids
Discussion
47.

Which of the following holds good to the laws of thermodynamics for the reaction ? C_2H_(4(g)) + 3O_(2(g)) to 2CO_(2(g)) + 2H_2O_((l))

Answer»

`DELTA H = Delta E + RT`
`Delta H = Delta E -RT`
`Delta H =Delta E + 2RT`
`Delta H = Delta E -2RT`

ANSWER :D
Discussion
48.

Which of the following options consist of substances that will illustrate law of reciprocal proportions?

Answer»

Water, carbon-di-oxdide and ethanol
Ammonia, water and di-nitrogen pentaoxide
Ferrous oxide, Ferric oxide and `Fe_(3)O_(4)`
NITROUS oxide, Nitric oxide and SULPHUR di-oxide.

Answer :B
Discussion
49.

Why are falling drops spherical ?

Answer»

SOLUTION :This is because force of SURFACE tension tends of decrease the surface AREA of the liquid to MINIMUM and for a given volume, sphere has minimum surface area.
Discussion
50.

The volume of atoms present in a fcc unit cell of a metal (r=atomic radius).

Answer»

`(16)/(3)pir^(3)`
`(12)/(3)pir^(3)`
`(24)/(3)pir^(3)`
`(20)/(3)pir^(3)`

Solution :(a) Total NUMBER of atoms in the UNIT cell fcc=4
Total volume of an atom `(4)/(3)pir^(3)xx4"["V=(4)/(3)pir^(3)"]"`
`(16)/(3)pir^(3)`
Discussion