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 is correct name according to IUPACnomenclature ?

Answer»

2-Hydroxy-5-methyl CYCLOHEXANOL
2-Ethyl-5,6-dimethyl CYCLOHEXANE CARBOXYLIC acid
2-Bromo-3-chloro-5,5-dimethyl cyclohexane carbaldehyde
3-Hydroxy pentanamine

ANSWER :C
Discussion
2.

Which compound is formed when excess KCN is added to an aqueous solution of copper sulphate?

Answer»

`CU(CN)_(2)`
`K_(2)[Cu(CN)_(4)]`
 `K[Cu(CN)_2]`
`K_3[Cu(CN)_4]`

ANSWER :D
Discussion
3.

Which gas has the same rate of diffusion as that of CO_2 at same P and T ?

Answer»

`N_2O`
`NO_2`
`N_2`
CO

Answer :A
Discussion
4.

Which of the following acids is the strongest ?

Answer»

`HCN(K_(a)=4xx10^(-10))`
`HS^(-)(K_(a)=1XX10^(-14))`
`HCO_(3)^(-)(K_(a)=4.8xx10^(-11))`
`HAsO_(4)^(2-)(K_(a)=3XX10^(-13))`

Solution :Stronger acid has HIGHER `K_(a)` value.
Discussion
5.

Which is not correct

Answer»

Phenol is more acidic than ACETIC acid
Ethanol is less acidic than phenol
Ethanol has lower BOILING point than ethane
Ethyne is a non-linear molecules

Solution :Phenols are much more acidic than alcohols but less so than carboxylic acids or even carbonic acid. This is indicated by the VALUES fo ionisation constants. The relative ACIDITY follows the order:
Ethanol has higher boiling point due to hydrogen bonding. Ethyne has linear shape due to sp-hybridisation .
`K_(a)underset(RCOOH)(10^(-5))gt underset(H_(2)CO_(3))(10^(-7))gt underset(C_(6)H_(5)OH)(10^(-10))gt underset(HOH)(10^(-14))gt underset(ROH)(10^(-18))`
Discussion
6.

Which one is not synthesized by Grignard reagent ?

Answer»

PRIMARY ALCOHOL
SECONDARY alcohol
A ketone
An ESTER

ANSWER :D
Discussion
7.

What is the [OH^-] in an aqueous solution which has a pH =11.70 ?

Answer»

`7.1xx10^(-2) M`
`5.0xx10^(-3) M`
`1.4xx10^(-6) M`
`2.0xx10^(-12) M`

ANSWER :B
Discussion
8.

To prepare 2- propanol from CH_3Mgl, the other chemical required is :

Answer»

HCHO
`CH_3CHO`
`C_2H_5OH`
`CO_2`

ANSWER :B
Discussion
9.

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 CI_(3)-NO_(2)`

ANSWER :B
Discussion
10.

Which shows reducing properties

Answer»

`SO_3`
`H_2SO_4`
`H_2S`
All

Answer :C
Discussion
11.

Which is increasing order of the reducing power of the following metals on the basis of standard electrode potential ? Ag^(+)//Ag=0.80 V " "Mg^(2+)//Mg=-2.37V Hg^(2+)//Hg=0.79V" "Cr^(3+)//Cr=-0.74V

Answer»

`Hg LT Ag lt MG lt CR`
`Cr lt Mg lt Ag lt Hg`
`Mg lt Cr lt Hg lt Ag`
`Ag lt Hg lt Cr lt Mg`

ANSWER :D
Discussion
12.

Which of the following biphenysis is optically active ?

Answer»




ANSWER :B
Discussion
13.

Which of the following is the strongest reducing agent ?

Answer»

`PH_(3)`
`SbH_(3)`
`AsH_(3)`
`BiH_(3)`

ANSWER :D
Discussion
14.

Which of the given statements is incorrect?

Answer»

Peroxide EFFECT proceeds via free radical chain mechanism
Peroxide effect is not observed in case of HCI
Tertiary carbocation is LESS STABLE than SECONDARY carbocation
Kharasch effect is APPLICABLE for unsymmetrical alkenes

Answer :C
Discussion
15.

Write the balanced equations in the manufacture of potassium dichromate from chromite ore.

Answer»

Solution :1. `4FeOCr_(2)O_(3) + 8Na_(2)CO_(3) + 7O_(2) rarr 8Na_(2)CrO_(4) + 2Fe_(2)O_(3) + 8CO_(2) uarr`
2. `2Na_(2)CrO_(4) + 2H^(+) rarr Na_(2)Cr_(2)O_(7) + 2Na^(+) + H_(2)O`
or
`2Na_(2)CrO_(4) + H_(2)SO_(4) rarr Na_(2)Cr_(2)O_(7) + Na_(2)SO_(4) + H_(2)O`
3. `Na_(2)Cr_(2)O_(7) + 2KCl rarr K_(2)Cr_(2)O_(7) + 2NaCl`
equation for manufacture of potassium dichromate from chromite ORE :
(i) Conversion of chromite into sodium CHROMATE :
`underset("(Chromite ore)")(4FeO.Cr_(2)O_(3)) + 8Na_(2)CO_(3) + 7O_(2) rarr underset("(Sodium chromate)")(8Na_(2)CrO_(4)) + 2Fe_(2)O_(3) + 9CO_(2)`
(ii) Conversion of sodium chromate into sodium dichromate :
`underset("(Sodium chromate)")(2Na_(2)CrO_(4))+H_(2)SO_(4) rarr underset("(Sodium dichromate)")(Na_(2)Cr_(2)O_(7)) + Na_(2)SO_(4)+H_(2)O`
(iii) Conversion of sodium dichromate into potassium dichromate :
`Na_(2)cr_(2)O_(7) + 2KCl rarr underset("(Potassium dichromate)")(K_(2)Cr_(2)O_(7)) + 2NaCl`
Discussion
16.

Which among the following shows maximum oxidation state ?

Answer»

V
Fe
Mn
Cr

Answer :C
Discussion
17.

When compared to DeltaG^(@) for the formation of Al_(2)O_(3), the DeltaG^(@) for the formation of Cr_(2)O_(3) is

Answer»

same
Upredicted
Higher
Lower

Solution :Al acts as a good reducing agent and reduces oxides of metals LIKE Cr, Fe, MN etc.
`Cr_(2)O_(3)+2Alto2Cr+Al_(2)O_(3)+`heat, THEREFORE `DeltaG^(o)` for the formation of `Al_(2)O_(3)` is lower in comparison to `DeltaG^(o)` for the formation of `Cr_(2)O_(3)`.
Discussion
18.

what is IUPAC name of compound when imino group is attached to ethyl and n-propyl group ?

Answer»

N-Ethylisopropyl AMINE
N-Ethylpropan -2- amine
N-Ethylpropan -1- amine
N-Ethylbutan-1- amine

Answer :C
Discussion
19.

The solubility of PbCL_2 is given by,

Answer»

`sqrtK_(SP)`
[K_sp]^(1/3)
`[[(K_sp)]/4]^(1/3)`
`[8K_(sp)]^(1/2)`

ANSWER :C
Discussion
20.

When reaction is at standard state at equilibrium , then:

Answer»

`DELTAH^(@) =0`
`DELTAS^(@) =0`
EQUILIBRIUM constant `K=0`
equilibrium constant `K=1`

SOLUTION :N//A
Discussion
21.

What is the activation energy for a reaction if the rate is doubled when the temperature is raised from 20^(@) C to 35^(@)C (R=8.314 J mol^(-1)K^(-1))

Answer»

15.1 kJ `MOL^(-1)`
`342 kJ mol^(-1)`
`269 kJmol^(-1)`
`34.7 kjmol^(-1)`

Solution :d) `k_(2)/k_(1) = 2, T_(1)=20+273=293 K`,
`T_(2)=35 + 273=308`K
`k=8.314 JK^(-1)mol^(-1)`
`log k_(2)/k_(1) =E_(a)/(2.303 ) [1/T_(1)-1/T_(2)]`
`log2= (E_(a))/(2.303 xx 8.314(JK^(-1)mol^(-1))[1/(293K)-1/(308K)]`
`0.3010= (E_(a) xx 15)/(2.303 xx 8.314 (Jmol^(-1)) xx 293 xx 308)`
`E_(a) = (0.3010 xx 2.303 xx 8.314 x 293 xx 308)/(15) (Jmol^(-1))`
`=34.673 J mol^(-1) = 34.673 kJ mol^(-1)`
Discussion
22.

What is meant by 'limiting molar conductivity ?

Answer»

SOLUTION :It is MOLAR CONDUCTIVITY at INFINITE DILUTION.
Discussion
23.

Which of the following statement is not correct for nitrogen ?

Answer»

Its electronegativity is very high
d-orbitals are available for bonding
it is a typical non-metal
its molecular size is small

Solution :Nitrogen does not have VACANT d-orbital in the OUTERMOST shell.
`N(7)= 1s^(2) , 2s^(2)2p^(3)`
Discussion
24.

Which of the following biomolecules is insoluble in water

Answer»

`alpha`-KERATIN
Haemoglobin
Ribonuclease
Adenine

Solution :This protein is FOUND in HAIR, nail, muscels etc.
Discussion
25.

What is the primary structural feature necessary for a molecule to make it useful in a condensation polymerisation reaction ?

Answer»

Solution :The primary feature necessary for MONOMER UNITS to undergo condenation polymerization is that each monomer unit must have two or THREE functional groups. For example , the MONOMERS of polyester are : terephthatic acid and ethylene glycol has two `-OH` groups.

In contrast , glypal polymer can be obtained by condensation of phthalic acid or its anhydride with either ethylene glycol which has two `-OH` groups or GLYCEROL which as three `-OH` groups.
Discussion
26.

Which is used for electrical purposes:

Answer»

GERMAN silver
Berylium bronze
Constantan
Fool's gold

Answer :C
Discussion
27.

What are inner-transition elements ? Decide which of the following atomic numbers are the numbers of the inner-transition elements : 29, 59, 74, 95, 102, 104.

Answer»

Solution :The f-block elements, i.e., in which the last electron enters into f-subshell are CALLED inner-transistion elements. These INCLUDE lanthanoids (58 - 71) and actinoids (90 - 103). THUS, elements with ATOMIC numbers 59, 95 and 102 are inner - transition elements.
Discussion
28.

Whichof the following does not condensewithaldehydes or ketones.

Answer»

`CH_(3)- NO_(2)`
`C_(2) H_(5) - NO_(2)`
`(CH_(3))_(2) CH - NO_(2)`
`(CH_(3))_(3) - NO_(2)`

ANSWER :D
Discussion
29.

Which one of the following compounds gives a positive iodoform test?

Answer»

Pentanal
1-phenyl ethanol
2-phenyl ethanol
3-pentanol

Answer :B
Discussion
30.

Which of the following shows greatest mert pair effect ?

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

SOLUTION :`I_2` has HIGHEST INERT PAIR EFFECT
Discussion
31.

Which of the following molecules is covalent and shows expanded octet in its formation ?

Answer»

HF
`NF_3`
`BF_3`
`ClF_3`

ANSWER :D
Discussion
32.

Whichone of the followingstatementsrelated tolanthanons isincorrect ?

Answer»

Europiumshow + 2oxidation STATE.
Thebasicitydecreasesas theionicradiusdecreasesfromPr to LU .
All the lanthanonsare muchmorereactivethanaluminium.
`CE^(4+)` solutionare widelyusedasoxidisingagentsin volumetricanalysis .

ANSWER :C
Discussion
33.

Which of the following compounds are gem-dihalides?

Answer»

Ethylidene chloride
Ethylene dichloride
Methylene chloride
Benzyl chloride.

Answer :A::C
Discussion
34.

Which of the following does not exist in free form?

Answer»

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

Solution :Boron form different hydride of GENERAL FORMULA `B_(n)H_(n+4) ` and `B_(n)H_(n+6)` but `BH_(3)` is UNKNOWN.
Discussion
35.

Which of the following specie does not exist:

Answer»

`HEH^(+)`
`Be_(2)`
`C_(2)^(2-)`
`NO^(+)`

SOLUTION :NA
Discussion
36.

Whichprocess in utilizedin the synthesis of carbohydrates in green plants ?

Answer»

OXIDATION
REDOXREACTION
PHOTOSYTHESIS
Reduction

Answer :C
Discussion
37.

Which of the following is not characteristic of alcohols?

Answer»

Lower ALCOHOLS are stronger and have bitter taste
Higher alcohols are stronger and have bitter taste
The BOILING points of alcohols increase with INCREASING
MOLECULAR mass

Answer :B
Discussion
38.

Which of the following is correct about actinides ?

Answer»

They form stable oxidation state +2
They do not form OXOCATION
They shows only +2 oxidation state
STABILITY of +3 oxidation state INCREASE as atomic number increases.

Answer :D
Discussion
39.

Which instrument is used potential difference ?

Answer»

Ammeter
VOLTMETER
Wheat STONE BRIDGE
metre bridge

Answer :B
Discussion
40.

Which of the following is not an amino acid?Glycine,Aniline,Histidine,Lysine.

Answer»

Glycine
Aniline
Histidine
Lysine

Answer :B
Discussion
41.

TiCl has structure similar to CsCl, the co- ordination number of Ti^(+)is-

Answer»

4
6
10
8

Answer :D
Discussion
42.

When boron is fused with potassium hydroxide which pair of species are formed ?

Answer»

`K_2O+B_2O_3`
`KO_2B_2H_6`
`K_3BO_3+H_2`
`K_3BO_3+H_2O`

SOLUTION :`2B(s)+6KOH(s)OVERSET("FUSE")to2K_3BO_3+3H_2`
Discussion
43.

Which out of the following is chiral in nature?

Answer»

`CH_(3)CH(OH)CH_(3)`
`CH_(3)CH(OH)C_(2)H_(5)`
`CH_(3)CH_(2)OH`
`CH_(3)CH(OCH_(3))CH_(3)`

Answer :B
Discussion
44.

Tritium undergoes radioactive decay giving

Answer»

`alpha-`particle
`beta-`particle
Neutrons
None of these

Solution :Tritium `(._(1)H^(3) rarr ._(2)He^(3) + ._(-1)e^(0))` is a `beta`-emitter
Discussion
45.

Which of the following metal Fe, Zn, Pb, Ag and Pt do not give a metal nitrate on treatment with concentrated HNO_3?

Answer»

FE and ZN
Fe and Pt
Pb, AG and Pt
Fe, Zn and Pt

Answer :D
Discussion
46.

Which of the following complex will have three isomeric forms ?

Answer»

CIS-`[Co(en)_(2)Cl_(2)]`
`[Cr(NO_(3))_(3)(NH_(3))_(3)]`
`K_(3)[Co(C_(2)O_(4))_(2)Cl_(2)]`
`K_(3)[Co(C_(2)O_(4))_(3)]`

Solution :
Discussion
47.

The structure of butylated hydroxy toluene is_______

Answer»




ANSWER :A
Discussion
48.

Threonine is (2S,3R) -2-amino-3-hydroxybutanoic acid. Which of the following is threonine ?

Answer»




SOLUTION :
Discussion
49.

Which of the following is correct decreasing order of r.ms.s velocity at same temperature for H_2, N_2, CO_2 and O_2

Answer»

`O_2 GT CO_2 gtN_2 gt H_2`
`H_2 gt N_2 gt O_2 gt CO_2`
`H_2 gt N_2 gt CO_2 gt O_2`
`N_2 gt CO_2 gt H_2 gt O_2`

ANSWER :B
Discussion
50.

Which reaction is termed as Darzen's reaction

Answer»

`ROH + HCl`
`ROH + PCl_5`
`ROH + SOCl_2`
`ROH + PCl_5`

SOLUTION :`R - OH + SOCl_2 to R - CL + SO_2 + HCl ` is called as Darzen.s RXns
Discussion