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 one of the following order of acid strength is correct ?

Answer»

`RCOOH GT HC -= CH gt HOH gt ROH`
`RCOOH gt ROH gt HOH gt HC -= CH`
`RCOOH gt HOH gt ROH gt HC -= CH`
`RCOOH gt HOH gt HC -= CH gt ROH`

SOLUTION :
Discussion
2.

Volume of 100 liter gas increases to 120 liter at constant temperature and 10 bar external pressure. Calculate the work done by the system [1 liter bar = 24.21 calory ]

Answer»

SOLUTION :`W= - 4842` CALORY
Discussion
3.

Which of the following are correct about the reaction, FeS_(2) + O_(2)rarrFe_(2)O_3 + SO_(2)

Answer»

E.q. wt. of `FeS_2`is M/11
Eq. wt. of `SO_2`is M/5.5
S has -2 OXIDATION state in `FeS_2`
1 mole of `FeS_2` requires 7/4 mole of `O_2`

Solution :`2FE^(2+) rarr (Fe^(3+))_2 +2e` ,
Eq.wt. of `FeS_(2) = (M)/(22//2) = M/11`
`2FeS_(2)+11/2O_(2) rarr 4SO_2 +Fe_(2)O_3`
In this reaction 22 eletrons INVOLVED for 4 moles of `SO_2` .
Eq.wt of `SO_(2)=(M)/(22//4) =M/(5.5) `
`O_(2)^(0) +4erarr2(O^(2-))`
has -1 oxidation state .
Discussion
4.

Which of the following have been arranged in decreasing of oxidation number of sulphur ?

Answer»

`Na_(2)S_4O_6 GT H_2S_2O_7 gt Na_2S_2O_3 gt S_8`
`H_2SO_4 gt SO_2gt H_2S gt H_2S_2O_8`
`SO_2^(2+)gt SO_4^(2-) gt SO_3^(2-) gt HSO_4^(-)`
`H_2SO_5 gt H_2SO_3 gt SCl_2 gt H_2S`

ANSWER :D
Discussion
5.

The type of hybridisation of carbon atoms of the molecule of the gas involved in Bhopal gas tragedy

Answer»

`SP,sp^2`
`sp,sp^3`
`sp^3,sp`
`sp^2,sp^3`

SOLUTION :`sp, sp^3`
Discussion
6.

The signs of DeltaH,DeltaS and DeltaG for a non-spontaneous reaction at all temperature would e

Answer»

`+,+,-`
`+,-,+`
`-,-,-`
`+,+,+`

ANSWER :B
Discussion
7.

Which one is diamagnetic ?

Answer»

`H_(2)^(-)`
`H_(2)^(+)`
`H_(2)`
`He_(2)^(+)`

SOLUTION :`H_(2)`
Molecule/ion`H_(2)^(-) "" H_(2)^(+) "" H_(2) "" He_(2)^(+)`
TOTAL `E^(-) " no. " "3123 " `
ODD No. Odd No. Even No. Odd No.
only `H_(2)` Has even ELECTRON so, `H_(2)` is diamagnetic
Discussion
8.

Which is an acid hydrocarbon ?

Answer»

`CH_3CH_2CH_2CH_3`
`CH_3C-= "CC"H_3`
`CH_3C-=CH`
`CH_2=CH-CH=CH_2`

Solution :Acidic CHARACTER INCREASES with PERCENTAGE of s- character
Discussion
9.

What is the proportion of s-character in sp^(3), sp^(2) and sp hybrid orbitals? What is the order of electronegativity in it?

Answer»

SOLUTION :
Discussion
10.

X gm of KHC_(2)O_(4) requires 100 ml of 0.02 M KMnO_(4) in acidic medium. In another experiment, y gm of KHC_(2)O_(4) requires 100 mkl of 0.05 M Ca(OH)_(2). The ratio of x and y is

Answer»

`1:1`
`1:2`
`2:1`
`5:4`

Solution :Eqts of `KHC_(2)O_(4)` = Eq of `KMnO_(4)`
`(x)/((MW)/(2))=(100xx0.02xx5)/(1000)"......."(1)`
Eqts of `KHC_(2)O_(4)` = Eq of `Ca(OH)_(2)`
`(y)/(MW)=(100xx0.05xx2)/(1000)""......(2)`
from `(1), (2)(2x)/(y)=1""x:y=1:2`
Discussion
11.

What is the oxidising agent in chlorine water ?

Answer»

HCl
`HClO_(2)`
HOCl
None of these

Solution :`Cl_(2)+H_(2)OtoHCl+HOCl`
`HOCl toHCl+[O]`
HOCl can FURNISH, NASCENT oxygen.
Discussion
12.

The _____readily undergoes addition reaction with HBr.

Answer»

`(CH_(3))_(2)C=CH_(2)`
`Cl-CH=CH-Cl`
`CH_(2)=CH-Cl`
`CH_(3)-CH=CH_(2)`

SOLUTION :`(CH_(3))_(2)C=CH_(2)`
Discussion
13.

Which of the following compound does not react with NaNH_(2) ? Why ? CH_(3) -= C CH_(3), CH_(3)CH_(2)C-=CH, C_(2)H_(5)C-=C C_(2)H_(5), HC -= CH, CH_(3)CH=CH_(2), CH_(2) = CH-C-=CH

Answer»

Solution :`CH_(3)C-=C CH_(3), C_(2)H_(5)C -= C C_(2)H_(5), CH_(3)CH -= CH_(2)` does not react with sodamide because there is ABSENCE of `-= CH` group.
Discussion
14.

What is the relation between K_(P) and K_(C), Give one example for which K_(P) is equal to K_(C),

Answer»

<P>

SOLUTION :The relation between `K_(P)` and `K_(C)` is `K_(P)=K_(C)(RT)^((Deltan_(g)))`
`K_(P)` = equilibrium constant is TERMS of partial pressure
`K_(c)` = equilibrium constant is terms of concentration
R = gas constat
T = Temperature
`Deltan_(g)` = Difference between the sum of the number of MOLES of products and the sum of number of moles of products and the sum number of moles of reactants in the gas phase
When `Deltan_(g)=0`
`K_(P)=K_(C)(RT)^(0)=K_(C)"ie",K_(P)=K_(C)`
Example : `H_(2)(g)+I_(2)(g)hArr2HI(g)`
`Deltan_(g)=2-2=0`
`:.K_(P)=K_(C)` for the synthesis of HI
Discussion
15.

Which of the following is not a general characteristic of equilibrium involving physical processes ?

Answer»

EQUILIBRIUM is possible only in a close system at a GIVEN temperature
All measurable properties of the system remains constant
All the PHYSICAL PROCESSES stop at equilibrium
The opposing processes occur at the same rate and there is dynamic but stable condition

Solution :All the physical processes stop at equilibrium
Discussion
16.

Which of the following is a primary alcohol ?

Answer»

neo-Pentyl alcohol
sec-Pentyl alcohol
tert-Pentyl alcohol
None of these

Solution :`UNDERSET(("NEOPENTYL alcohol is a" 1^(@) "alcohol"))(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)OH`
Discussion
17.

Which of the following statementabout the followingreaction are wrong? 2Cu_(2)(s)+Cu_(2)S(s)rarr 6 Cu(s)+SO_(2)(g)

Answer»

Both `Cu_(2)O` and `Cu_(2)S` are REDUCED
`Cu_(2)S` is the oxidant
`Cu_(2)S` is the oxidant
only `Cu_(2)O` is reduced

Answer :B,c,d
Discussion
18.

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
19.

What is plaster of paris? How is it parpared? Give its any two important uses.

Answer»

Solution :Plaster of PARIS is ` CaSO_(4) (1)/(2) H_(2) O`. It is prepared by heating gypsum at 373 K.
`CaSO_(4). 2H_(2) O underset(373 K)overset("heat")(to) CaSO_(4) (1)/(2) H_(2)O + (3)/(2) H_(2)O`
uses:
(i) It is used for MANUFACTURE of STATUS. (ii) It is used for FILLING gaps before white washing.
Discussion
20.

Which statement is correct ?

Answer»

Ethanol is more ACIDIC than phenol
Phenol is more acidic than ethanol
Phenol is more acidic than BENZOIC ACID
Acidity of phenol and benzoic acid is about equal

Answer :B
Discussion
21.

The triad of nuclei that is isotonic is

Answer»

`._6^14C, ._7^15N, ._9^17F`
`._6^12C, ._7^14N, ._9^19F`
`._6^14C, ._7^14N, ._9^17F`
`._6^14C, ._7^14N, ._9^19F`

SOLUTION :All ATOMS in TRIAD (a) have same NUMBER of NEUTRONS (=A-Z=8)
Discussion
22.

Writeelectron configurationof chromium and coppergivereasonof are (z=24)Cu (z=10and Cr=4s^(1)

Answer»

Solution :ELECTRON configurationof `Cr : [Ar]^(18) 3d 4S^(1)`
Orbitaldiagram of Cr :
Electron configurationof `Cu : (Ar) ^(18)3d^(10)4s^(1) `
Orbitaldiagramof Cu :
Discussion
23.

Which ion is present in higher amount than its desirable limit in drinking water may cause blue baby disease ?

Answer»

Sulphate
NITRATE
Chloride
Fluoride

SOLUTION :Nitrate
Discussion
24.

What is absolute entropy ?

Answer»

SOLUTION :Entropy of a mole substance at STANDARD state is called standard molar entropy or absolute entropy.
Discussion
25.

What is peroxide effect? Give example .

Answer»

Solution :The addition of `HBr` to an alkene in the PRESENCE of organic PEROXIDE, gives the anti Markovniko's PRODUCT. This effect is CALLED peroxide effect.
Discussion
26.

What do you understand by (i) electron deficien t(ii) electron precise and (iii) electron rich compounds of hydrogen? Provide justification with sutable examples

Answer»

SOLUTION :For ANSWER, CONSULT SECTION 9.6
Discussion
27.

The standard boiling point of water is

Answer»

371.8 K 
372.6 K 
373.0 K 
373.4 K

Answer :B
Discussion
28.

What volume of 0.2M Ba(MnO_(4))_(2) solution is required for complete oxidation of 25 gm of 89.6% pure Fe Cr_(2)O_(4) in acidic medium according to the reaction MnO_(4)^(-) +FeCr_(2)O_(4) rarr Fe^(+3) +Cr_(2)O_(7)^(-2) +Mn^(+2)

Answer»

`700ml`
`175ml`
`350ml`
`200ML`

Solution :No. of MILLI equivalents of `Ba(MnO_(4))_(2) =`
No. of milli equivalents of `FeCr_(2)O_(4)`
n-factor of `Ba(MnO_(4))_(2) = 10`
n-factor of `FeCr_(2)O_(4) = 7`
`:. V xx 0.2 xx 10= (25 xx 89.6 xx 10^(3))/(100xx((224)/(7))):. V = 350ml`
Discussion
29.

Which inert element is the most reactive ?

Answer»

He
Xe
Ar
Ne

Answer :B
Discussion
30.

Which of the following salts is the most basic in aqueous solution ?

Answer»

`Al(CN)_(3)`
`CH_(3)CO OK`
`FeCl_(3)`
`Pb(CH_(3)CO O)_(2)`

Solution :`Al(CN)_(3)`-SALT of WEAK acid and weak BASE
`CH_(3)CO OK` - salt of weak acid and strong base.
`FeCl_(3)`-salt of weak baseand strong acid
`Pb(CH_(3)CO O)_(2)`-salt of weak acid and weak base
Thus, solution of `CH_(3)CO OK` is most basic.
Discussion
31.

What is the weight in gram of available O_(2) per litre from a solution of H_(2)O_(2), 10 mL of which when titrated with N//20 KMnO_(4) solution required 25 mL for the reaction ? 2KMnO_(4)+5H_(2)O_(2)+4H_(2)SO_(4)to 5O_(2)+8H_(2)O+2KHSO_(4)+2MnSO_(4)

Answer»


SOLUTION :N//A
Discussion
32.

The structure of isobutyl group in an organic compound is ............. .

Answer»

1) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-`
2) `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C`
3) `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-`
4) `CH_(3)-underset(|)(CH)-CH_(2)-CH_(3)`

Answer :C
Discussion
33.

Which of the following will not give white precipitate with ammoniacal silver nitrate solution ?

Answer»

`CH_(3)-C-=C-CH_(3)`


ANSWER :A::B::C
Discussion
34.

Who stated that "matter is composed of small indivisible particles" ?

Answer»

DALTON
Lavoisier
Hoffman
John proust

Answer :A::D
Discussion
35.

Which of the following has/have aromatic character:

Answer»




ANSWER :A::D
Discussion
36.

Which of the following statement(s) is / are correct for anhydrous calcium chloride

Answer»

It is prepared by heating hydrated calcium chloride above 533 K
It is used for drying alcohols and ammonia
It is used as a dehydrating AGENT to CLEAR sonw and ice on highways and payments
When mixed in concrete it gives quicker initial setting and IMPROVES its strenght

Solution :According to properties of `CaCI_(2)` a, c, d are correct
Discussion
37.

Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons ?

Answer»

Pauli's exculsion principle
Heisenberg's uncertainty principle
Hund's RULE of MAXIMUM multiplicity
Aufbau principle

Solution :Heisenberg's uncertainly principle STATES the path of the electrons cannot be MEASURED with certainty
Discussion
38.

Which is/are correct for real gases?

Answer»

`underset(P to 0)(L t) (PV_m)` = constant at constant high temperature 
`underset(V_m to 0)(L t) (PV_m)`= constant at constant low temperature 
As the temperature is REDUCED, the pressure DECREASES 
A point is reached where theoretically, the volume BECOME zero 

Solution :`underset(P to 0)(LT) (PV) = 1, V != 0 ` for IDEAL gas .
Discussion
39.

Which of the following reagents is used for the separation of acetaldehyde from acetophenone?

Answer»

`NH_(2)OH`
`NaOHI_(2)`
`NaHSO_(3)`
`C_(6)H_(5)NHNH_(2)`

ANSWER :C
Discussion
40.

What is the correct order of decreasing stability of the following cations ? underset(I)(CH_(3)-overset(o+)(C)H-CH_(3)) "" underset(II.)(CH_(3)-overset(o+)(C)H-OCH_(3)) underset(III.)(CH_(3)-overset(o+)(C)H-CH_(2)-OCH_(3))

Answer»

`II GT I gt III`
`II gt III gt I`
`III gt I gt II`
`I gt II gt III`

Solution :
THUS, the stability of CARBOCATIONS decreases in the ORDER: `II gt I gt III`, i.e., OPTION (a) is correct.
Discussion
41.

Which of the following act as an oxidising as well as reducing agent?

Answer»

`Na_(2)O`
`NaO_(3)`
`NaNO_(3)`
`NaNO_(2)`

Answer :D
Discussion
42.

Which of the following is carcinogenic?

Answer»

BENZOPYRENE
`O_3`
`CH_4`
`CO_4`

SOLUTION :Benzopyrene
Discussion
43.

Write down the possible isomers of C_(5)H_(11)Br and give their IUPAC and common names.

Answer»

Solution :All possible isomers off `C_(5)H_(11)Br`. Therefore are 8 isomers that have the molecule FORMULA `C_(5)H_(11)Br`.
(i) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(2)Br`1-bromo pentane.
(ii) `CH_(3)-CH_(2)-CH_(2)-underset(Br)underset(|)(C)H-CH_(3)` 2-bromo pentane
(III) `CH_(3)-CH_(2)-underset(Br)underset(|)(C)H-CH_(2)-CH_(3)`3-bromo pentane.
(iv) `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(2)Br`1-bromo-2-methyl BUTANE.
Discussion
44.

What is disproportionation reaction ? Give example.

Answer»

SOLUTION :In which REACTION one COMPONENT forms oxidation and reduction both such type of reaction is known as DISPROPORTIONATION reaction.
Discussion
45.

Three moles of B_2H_6 are completely reacted with methanol. The number of moles of boron containing product formed is:

Answer»


ANSWER :6
Discussion
46.

van der Waals constant b in corrected equation for real gases represents

Answer»

MEASURE of effective size of gas molecules
magnitude of attractive FORCES among gas molecules
free volume of the molecules
difference in pressure and volume of gas molecules.

Solution :Constant B is INTRODUCED for correction of volume.
Discussion
47.

The visible part of electromagnetic radiations is

Answer»

`2000 Å to 4000 Å`
`2000 Å to 5000 Å`
`4000 Å to 8000 Å`
`1000 Å to 2000 Å`

SOLUTION :The visible part of electromagnetic RADIATION is `4000 Å to 8000 Å`
Discussion
48.

Which of the following gases has the highest density under standard conditions?

Answer»

CO
`N_(2)O`
`C_(3)H_(8)`
`SO_(2)`

Answer :D
Discussion
49.

Which one of the following is/are buffer solution(s)?

Answer»

`0.8 M H_2S + 0.8 M KHS ` <BR>` 2 M C_6 H_5 NH_2 +2 M C_6H_5 NH_3 Br`
` 3 M H_2CO_3 +3M KHCO_3`
` 0.05 M KCIO_4 +0.05 M HCIO_4`

SOLUTION :Strong ACID and its salt with S.B cannot act as buffer
Discussion
50.

What are free radical initiators ?

Answer»

Solution :The types of reagents that remote homelytic in substrate are called as free radical INITIATORS . They are SHORT LIVED and are HIGHLY REACTIVE .
Discussion