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 folowing is a Lewis acid ?

Answer»

`C_2H_2`
` C_2H_4`
Pyridine
NONE OFTHE above

SOLUTION :All are `E^(-) ` rich DUE to double bond
Discussion
2.

Which of the following statement is NOT true about lithium and magnesium ?

Answer»

Both of these are softer than other ELEMENT in respective group
Chlorides of both can dissolve in ethnol
Clorides of both are DELIQUESCENT solids
Both of them combine with NITROGEN to form NITRIDE

Answer :A
Discussion
3.

Toluene reagent for nuclear iodination of aromatic compound is :

Answer»

BENZYL chloride
banzoyl chloride
p-chlorotoluene
p-chlorotoluene

Answer :a
Discussion
4.

Which of the following compounds will exhibit geometrical isomerism ?

Answer»

2-Phenyl-1-butene
1,1-Diphenyl-1-propene
1-Phenyl-2-butene
3-Phenyl-1-butene

Solution :Only in 1-phenyl-2-butene `(C_6H_5CH_2-CH=CH-CH_3)` both the CARBON atoms of the double BOND have different SUBSTITUENTS and HENCE shows geometrical isomerism.
Discussion
5.

What is relation between viscosity and pressure ?

Answer»

Solution :VISCOSITY `PROP` PRESSURE
Exception for WATER viscosity `prop (1)/("pressure")`
Discussion
6.

Which of the following is correct for N_2 + 3H_2 harr 2NH_3

Answer»




ALL

Solution :`[NH_(3)]` should `uarr` with time and `[H_(2)]`. `[N_(2)]` should `darr`
Discussion
7.

Write last element of the period 1 to 7.

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SOLUTION :Known as Noble gas.

LAST element of `7^(th)` period Z = 118
Discussion
8.

Which of the following is more appropriate reason of aniline being less basic than aliphatic amines ?

Answer»

hyper conjugation
Steric hindrance
Delocalisation of lone pair
Negative INDUCTIVE EFFECT of `-NH_(2)` group

Solution :BASIC STRENGTH `prop (1)/("delocalisation of LP")`
Discussion
9.

When 0.02 mole of an alkali is added to an acid buffer , the pH changes from 4.75to 4.8 the buffer capacityis

Answer»

`2.5`
`0.25`
`0.4`
`0.025`

SOLUTION :BUFFER CAPACITY=`(N)/(Delta pH)=(0.02)/(0.05)= 0.4`
Discussion
10.

The volume of acetylene gas produced at25^(@)Cand 0.950 atm. pressure from calcium carbide by the reaction 128 g of calcium carbide with 45 g of water is

Answer»

3.22 litre
32.2 litre
16.1 litre
None of these

SOLUTION :`CaC_2+2H_2O rarr Ca(OH)_2+C_2H_2`
The LIMITING REAGENT is water
For 36 g of `H_2O` NUMBER of moles of `C_2H_2=1`
1 of `H_2O` number of moles of `C_2H_2= 1/(36)`
45g of `H_2O` number of moles of `C_2H_2`
`=1/36 xx 45 = 1.25`
Use PV=nRT
Discussion
11.

Which among the following is correct for electrolysis of brine solution?

Answer»

SODIUM METAL is COLLECTED at anode
`O_(2)`gas is liberated at cathode

Answer :D
Discussion
12.

Which one of the following gases has the lowest value of Henry's Law constant.

Answer»

`N_(2)`
He
`CO_(2)`
`H_(2)`

Solution :Carbon DIOXIDE, most stable GAS and has LOWEST VALUE of Henry.s Law constant.
Discussion
13.

What is the weight of 1 gram-equivalent of the oxidising and the reducing agent in the following reaction? 5Zn + V_(2) O_(5) to 5 ZnO+ 2 V"" (V = 50.94, Zn = 65.38 and O = 16)

Answer»


Solution :Zn is REDUCING agent and its ON change = 2, `V_(2) O_(5)` is oxidising agent and its ON change = 10
Discussion
14.

The vapour density of completely dissociated NH_(4)C1 would be

Answer»

Slight less than half that `NH_(4)C1`
Half that of `NH_(4)C1`
Double that of `NH_(4)C1`
Determined by the AMOUNT of SOLID `NH_(4)C1` in the experiment

Solution :`("Normal MOLECULAR weight")/("experimental molecular wt.") =1+ALPHA`
`NH_(4)C1hArrNH_(3) + HC1`
`.: alpha = 1`
`:.` "Experimental Molecular wt". `= ("nor.mol.wt.")/(2)`
Discussion
15.

Which of the following is carcinogetic and causes irritation in eyes and mocous membrane?

Answer»

PAH
THF
`CO_(2)`
PAN

Answer :A
Discussion
16.

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

Answer»

`Br_(2)(g)`
`Cl_(2)(g)`
`H_(2)O(g)`
`CH_(4)(g)`

Solution :`Delta_(f)H^(@) = 0` for ELEMENTARY substances in standard STATE . `Br_(2)`is LIQUID in standard state.
Discussion
17.

Which of the following salts are acidic in aqueous solutions?

Answer»

`(NH_4) _2SO_4`
` NaHCO_3`
`CuSO_4`
` AgNO_3`

SOLUTION :CATION HYDROLYSIS `RARR` ACIDIC solution.
Discussion
18.

Which of the following groups is o-p directing but deactivates benzene ring for electrophilic substitution?

Answer»

`-CH_(3)`
`-NH_(2)`
`-Cl`
`-NO_(2)`

Solution :HALOGENS are electron withdrawing groups due to electronegative nature HENCE they deactivate benzene ring for electrophilic substitution but are o,p-directing.
Discussion
19.

What ar optical fibers ? What are their advatages over ordinary glass like that of window panes ?

Answer»


Solution :Optical fibers are obtained by drawing glass into fibers thinner than even human hair but still possess very high mechanical STENGTH. The advantage of optaical fibers is that unlike ordinary glass like that of window panes which stops light in less than one meter.optical fibers transmit light over kilometers without any notceable decrease ion intensity , that is why they are being USED in radio broadcast , television programmes and TELECOMMUNICATION including mobile and internet sevices. They are cheeper than copper COILS and take much less space.
Discussion
20.

Two oxide of metal M have 27.6% and 30% oxygen by weight. If the formula of the first oxide is M_(3)O_(4) what is the formula of second oxide?

Answer»

MO
`MO_(2)`
`M_(2) O_(5)`
`M_(2) O_(3)`

ANSWER :D
Discussion
21.

What are the states of hybridisation of carbon atoms forming a triple bond?

Answer»

SOLUTION :SP , sp
Discussion
22.

Which name is correct :

Answer»




ANSWER :B
Discussion
23.

Which of the following are isoelectronic species, i.e., those having the same number of electrons ? Na^(+), K^(+), Mg^(2+), Ca^(2+), S^(2-), Ar.

Answer»

SOLUTION :`{:("No. of electrons are :",Na^(+)=11-1=10",",K^(+)=19-1=18",",Mg^(2+)=12-2=10","),(,CA^(2+)=20-2=18",",S^(2-)=16+2=18",",Ar=18):}`
HENCE, isoelectronic species are `Na^(+)` and `Mg^(2+), K^(+), Ca^(2+), S^(2-)` and `Ar`,
Discussion
24.

When o-phenolsulphonic acid is heated to 373 K, it gives

Answer»

Phenol
p-Phenolsulphonic acid
BENZENE sulphonic acid
Benzene

Solution :o-phenol sulphonic is unstable at higher temperature (373 K) due to STERIC FACTOR and REARRANGES to more stable p-isomer.
Discussion
25.

Which of the following statements are correct I) Now-a-days syngas is produced from sewage, sawdust, scrap wood, news paper etc. II) The process of producing syngas from coal is called coal gasification. III) The production of dihydrogencan be increased by treating syngas mixture with steam in the presence of iron chromate catalyst. IV) 77% of the industrial dihydrogen is produced from petro chemicals

Answer»

I, II
III, IV
I, III
I, II, III, IV

Answer :D
Discussion
26.

Which of the following pair is expected to havethe same bond order ?

Answer»

`O_(2), N_(2) `
`O_(2)^(+) , N_(2) ^(-)`
`O_(2)^(-) , N_(2)^(+)`
`O_(2)^(-), N_(2) ^(-)`

SOLUTION :BOND orders are : ` O _(2) = 2, N_(2) = 3, O_(2)^(+)= 2.5, N_(2)^(-) = 2.5 , O_(2)^(-)= 1.5 , N_(2) ^(-) = 2.5 ` .
Discussion
27.

When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink. On the basis of this information, mark the correct answer. underset"(pink)"([Co(H_2O_6)]_((aq))^(3+) + 4Cl_((aq))^(-) hArr underset"(blue)"([CoCl_4]_((aq))^(2)) + 6H_2O_((l))

Answer»

`DeltaH GT 0` for the reaction
`DeltaH lt 0` for the reaction
`DeltaH=0` for the reaction
The sign of `DeltaH` cannot be PREDICTED on the basis of this information.

Solution :In the reaction,
`underset"(pink)"([Co(H_2O_6)]_(aq)^(3+)) + 4Cl_((aq))^(-) hArr underset"(blue)"([CoCl_4]_((aq))^(2)) + 6H_2O_((l))`
On cooling, the equilibrium shifts reverse DIRECTION or on heating, the equilibrium shifts forward direction. Hence, reaction is endothermic. i.e., `DeltaH gt 0`.
Discussion
28.

Which is not an element ?

Answer»

Carbon
Sodium
Oxygen
NaCl

Answer :A::C::D
Discussion
29.

What type of substitution reactions are shown by benzene?

Answer»

SOLUTION :ELECTROPHILIC
Discussion
30.

Which of the following statements is/are wrong ?

Answer»

Beilstein test is a reliable test for halogens in organics compounds.
In Lassaigne's test for N, Prussian blue colour is due to the formation of ferro - ferri cyanide.
`FeCl_(3)` solution is added to the Lassaigne's extract to detect the presence of both N and S
Molecular mass of an acid = EQUIVALENT mass X acidity.

Solution :(a) Indicates the presence of Br.
(b) Victor Meyer.s method is used to determine molecular mass of volatile ORGANIC compound. Dumas method is used to DERTERMINE PERCENTAGE of N. The molecular mass of non - volatile compound is determined by depression in freezing point or by elevation in boiling point method.
Discussion
31.

Which mixture is lighter than humid air?

Answer»

`N_(2)+O_(2)+SO_(2)`
`N_(2)+O_(2)+CO_(2)`
`N_(2)+O_(2)+C_(2)H_(6)`
`N_(2)+O_(2)+H_(2)`

SOLUTION :HUMID Air = `N_(2)+O_(2)+H_(2)O`
`therefore` Lighter = `N_(2)+O_(2)+H_(2)`
Discussion
32.

Which one the following reaction gives hydrogen peroxdide ?

Answer»

`Na_(2)O_(2)+H_(2)Ooverset(Ice-cold)to `
HYDRATED `BaO_(2)+CO_(2)+H_(2)OTO`
Aerical oxidation of 2-rthyl anthraqumiol
`KO_(2) +H_(2)Oto`

Answer :ABCD
Discussion
33.

Which of the following gives on reaction with a base

Answer»




ANSWER :A
Discussion
34.

What is the hardest compound of boron known?

Answer»

SOLUTION :Boron CARBIDE `B_4C` is the HARDEST substance known.
Discussion
35.

Which of the following groupings represents collection of isoelectronic species? (At. No. : Cs = 55, Br = 35)

Answer»

`Na^(+), Ca^(2+), Mg^(+)`
`N^(3-) , F^(-) , Na^(+)`
`Be, Al^(3+), Cl^(-)`
`Ca^(2+), CS^(+), Br`

SOLUTION :`{:(N,(7),N^(3-),(10),""N^(3)","F^(-)" and " Na^(+)),(F,(9),F^(-),(10),"are isoelectronic"),(Na,(11),Na^(+),(10),):}`
Discussion
36.

Two identical fully insulated flasks X and Y contain the following Flask X (10 g of ice at 0^(@)C + 500 mL of water at 0^(@)C) Flask Y (10 g of ice at 0^(@)C + 500 mL of brine at 0^(@)C) After one hour,

Answer»

There is no change in the nature of contents of the two flasks
There is no ice in flask X but contents of flask Y remain unchanged
There is no change in the contents of flask X but there is no ice in flask Y
No ice is there in both the flasks X and Y

Solution :Due to equilibrium in flask X the amount of ice will not change with time. As non-volatile IMPURITIES lower the freezing point, freezing point of BRINE is less than `0^(@)C`. Thus, ice in flask Y will melt and temperature of brine will fall below zero.
Discussion
37.

Which heteroatom is present in pyrrole ?

Answer»

SOLUTION :NITROGEN
Discussion
38.

Which of the following solids is not an electrical conductor ? (A) Mg(s), (B)TiO(s) , (C )I_2(s) , (D)H_2O (s)

Answer»

(A) only
(B) only
(C ) and (D)
(B), (C ) and (D)

ANSWER :c
Discussion
39.

What is the relative humidity of air at 1 bar pressure and 313K temperature if partial pressure of water is 19.355 mmHg. For any data use the table given below:

Answer»

`35%`
`25%`
`75%`
`5%`

SOLUTION :N//A
Discussion
40.

When the electron in the 'H' atom jumps from the fifth orbit to the second orbit, the spectral line emitted is found in ---- region.

Answer»

VISIBLE region
Utraviolet region
Near IR region
Far IR region

Answer :A
Discussion
41.

Which substance is serving as a reducing agent in the following reaction? 14H^(+)+Cr_(2)O_(7)^(2-)+3Ni rarr 2Cr^(3+)+7H_(2)O+3Ni^(2+)

Answer»

`H_(2)O`
`Ni`
`H^(+)`
`Cr_(2)O_(7)^(2-)`

ANSWER :B
Discussion
42.

The species having largest size is

Answer»

NA
`Na^(+)`
K
`K^(+)`

ANSWER :C
Discussion
43.

Write the expression for the equilibrium constant, K_(c) for each of the following reactions :(i) 2 NOCl (g) hArr 2 NO (g) + Cl_(2) (ii)2 Cu ( NO_(3)) _(2) (s) hArr 2 CuO (s) + 4 NO_(2) (g) + O _ (2) (g) (iii)CH_(3) COOHC_(2) H_(5) (aq) + H_(2)O (l) hArr CH_93) COOH (aq) + C_(2) H_(5) OH(aq) (iv)Fe^(3+) (aq) + 3 OH ^(-) (aq) hArr Fe (OH)_(3) (s) (v)I_(2) (s) + 5 _(2) hArr 2 IF_(5)

Answer»

Solution :`K_(c) = ([NO(g)]^(2) [Cl_(2) (g) ])/([NOCl(g) ]^(2))`
` K_(c) = ([CuO(s)]^(2) [NO_(2) (g)]^(4) [O_(2)(g)])/([Cu (NO_(3))_(2) (s)]^(2))= [NO_(2)(g)]^(4) [O_(2)(g)]`
`K_(c) = ([CH_(3) COOH (aq)] [C_(2)H_(5)OH(aq)])/([CH_(3) COOC_(2) H_(5) (aq) ] [H_(2)O(L) ])`
` K_(c) = [Fe(OH)_(3)(s)]/([Fe^(3+) (aq) ][OH^(-)(aq)]^(3) )= 1/([Fe^(3) (aq) ][OH^(-)(aq)]^(3)) ""(v)K_(c) = ([IF_(5)]^(2))/[I_(2) (s) [F_(2)]^(5))= ([IF_(5)]^(2))/([F_(2)]^(5))`
Discussion
44.

Write the conjugate acid for the following (a)Cl^(-),(b)NO_(3)^(-),(c)HSO_(4)^(-),(d)HCO_(3)^(-),(e)SO_(4)^(2-),(f)CO_(3)^(2-),(g)NH^(2-),(h)N^(3-),(i)O^(2-),(j)H_(2)O,(k)NH_(3)

Answer»

SOLUTION :
Discussion
45.

Which of the following molecules is achiral?

Answer»




SOLUTION :
Discussion
46.

What is the role of hypo in photography?

Answer»

SOLUTION :WORKS as FIXER
Discussion
47.

Thermodynamically, the most stable form of carbon is

Answer»

diamond
graphite
fullerences
coal

Answer :B
Discussion
48.

The solution is 2L of 0.02 M NaOH . The solubility product of Zn(OH)_2 is 4.5xx10^(-17) . Then how many gram Zn(OH)_2 maximum soluble in given NaOH solution ?

Answer»

SOLUTION :`2.228xx10^(-11)` G
Discussion
49.

Which of the following reaction is not a part of solvay's process for preparation of sodium carbonate?

Answer»

`2NH_(3)+H_(2)O+CO_(2)to(NH_(4))_(2)CO_(3)`
`(NH_(4))_(2)CO_(3)+H_(2)O+CO_(2)to2NH_(4)HCO_(3)`
`2NH_(4)HCO_(3)to(NH_(4))_(2)CO_(3)+H_(2)O+CO_(2)`
`NH_(4)HCO_(3)+NaCltoNH_(4)Cl+NaHCO_(3)`

Solution :`2NaHCO_(3)toNa_(2)CO_(3)+H_(2)O+CO_(2)`
Discussion
50.

Which of the following is the correct order of gradually decreasing basic nature of the oxides?

Answer»

`Al_(2)O_(3), MGO, Cl_(2)O_(7), SO_(3)`
`Cl_(2)O, SO_(3), Al_(2)O_(3), MgO`
`SO_(3), Cl_(2)O_(7), MgO, Al_(2)O_(3)`
`MgO, Al_(2)O_(3), Cl_(2)O_(7)`

Answer :D
Discussion