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.

Mark the correct statement from the following :

Answer»

<P>Copper metal can be oxidised by `ZN^(2+)` ions.
Oxidation number of phosphorus in `P_(4)` is 4
An element in the highest oxidation state acts only as a REDUCING agent.
The element which shows highest oxidation number of +8 is Os in `OsO_(4)`

Solution :CU cannot be oxidised by `Zn^(2+)` ion, oxidation number of phosphorus is zero. An element in its highest oxidation state acts as an OXIDISING agent.
Discussion
2.

Mark the correct statement for viscosity .

Answer»

GREATER the viscosity , more slowly the liquid flows .
Viscosity increases with increase in temperature .
Hydrogen bonding and VAN DER Waals forces decrease the viscosity .
Viscosity is the measure of ease with which a liquid flows .

Solution :More viscous liquids FLOW slowly.
Discussion
3.

Mark the correct statement :

Answer»

Group I basic radicals are PRECIPITATED as chlorides
Group IV basic radicals are precipitated as sulphides
Group V basic radicals are precipitated as carbonates
All the STATEMENT are CORRECT.

Solution :All the three statement are correct
Discussion
4.

Mark the correct order of increasing reactivity

Answer»

`CH_(3)CONH_(2) lt CH_(3)COOC_(2)H_(5) lt CH_(3)COCl`
`CH_(3)COOC_(2)H_(5) lt CH_(3)COCl lt CH_(3)CONH_(2)`
`CH_(3)COCl lt CH_(3)CONH_(2) lt CH_(3)COOC_(2)H_(5)`
`CH_(3)COOC_(2)H_(5) lt CH_(3)CONH_(2) lt CH_(3)COCl`

SOLUTION :This can be explained on the basis of basicity of leaving GROUP in each case. For acid chlorides, leaving group is `Cl^(-)` ions and for esters, leaving group is alkoxide. However, in amide, leaving group is `NH_(2)` or amine. Out of these three, `Cl^(-)` ion is weakest BASE hence acid chlorides are most reactive. But `NH_(2)` or amines are strongest bases, hence amides are least reactive
Discussion
5.

Mark the correct answer. Air which contains…. CO_(2) does not support combustion.

Answer»

`15%`
`2%`
`50%`
`75%`

SOLUTION :`CO_(2)` is heavier than air
Discussion
6.

Mark out the optically active molecule :

Answer»




SOLUTION :Alkene with same GROUP at any ONE END does not SHOW Optical isomersim.
Discussion
7.

Mark out the correct statement (s) :

Answer»

Electrons within a SUB shell for which `l gt 0` mean that the RELATIVELY greater electrostatic repulsion between two electrons in the same ORBITAL within a sub shell as compared with occupancy of two orbitals having DIFFERENT `m_(l)` values.
Electrons in singly occupied orbitals tend to have their spins in the same direction so as to maximize the net magnetic moment
In the ground state, an atom adopts a configuration with the greatest number of unpaired electrons.
Electrons in different orbitals with parallel spins show mutual attraction, so electron-nucleus INTERACTION is improved.

Answer :A::B::C
Discussion
8.

Marbles of diameter 10mm each to be arranged on a flat surface so that their centers lie within the area enclosed by four lines of length each 40 mm. Sketch the arrangement that will given the maximum number of marbles per unit area, that can be enclosed in this manner and deduce the expression to calculate it

Answer»


ANSWER :25, 1.804 MARBLES/`CM^(2)`
Discussion
9.

Mark out the correct increasing order of radius.

Answer»

`As^(3-)ltBr^(-) lt K^(+) lt Mg^(2+)`
`Mg^(2+) lt K^(+) lt Br^(-) lt As^(3-)`
`Mg^(2+)ltK^(+)ltAs^(3-) lt Br^(-)`
`K^(+) lt Mg^(2+) lt Br^(-) lt As^(3-)`

ANSWER :B
Discussion
10.

Mark as true or false : Find the number of false statements.

Answer»


ANSWER :6
Discussion
11.

Many thermodynamically feasible reactions do not occur under ordinary conditions. Why ?

Answer»

SOLUTION :Under ORDINARY conditions , the average ENERGY of the reactants MAY be LESS than threshold energy . They require some activation energy to initiate the reaction.
Discussion
12.

Many real gases behave as ideal gases at "______________".

Answer»

0 K and 1 atm
`0^(@)C` AND1 atm
1K and 1 atm
298 K and 10 atm

ANSWER :B
Discussion
13.

Many ionic crystals dissolve in water because

Answer»

Water is an amphiprotic solvent
Water is a high boiling liquid, which has no taste and no odour
The PROCESS is accompanied by a positive heat of solution
Water decreases the inter ionic attraction in the CRYSTAL lattice DUE to solvation.

Answer :D
Discussion
14.

Many cereals are made with high moisture content so that the product can be formed into various containing 50% H_(2)O by mass is produced at the rate of 1000 kg/hr. How much water (in kg)must b evaporated per hour if final product contains only 20% water? (Fill your answer dividing it by 62.5)

Answer»


ANSWER :6
Discussion
15.

Manmade sillicate is ……

Answer»

SOLUTION :GLASS and CEMENT.
Discussion
16.

Mangoes contain

Answer»

SOLUTION :CYCLOHEXANE
Discussion
17.

Manganese trifluoride can be prepared by the reaction: MnI_(2(s))+13//2F_(2(g))rarrMnF_(3)+2IF_(5) What is the minimum amount of F_(2) that must be used to react with 12 g of MnI_(2) if only 75% F_(2) is utilized to convert all of MnI_(2) to MnF_(3)?

Answer»


ANSWER :`12.78g`;
Discussion
18.

Manganese forms non-stoichiometric oxides having the general formula MnO_(x). The value of x for the compound that analyzed 64% Mn. (At wt Mn=55)

Answer»

`1.16`
`1.83`
2
`1.93`

SOLUTION :`1%Mn=64=(55)/(M)XX100`
`%O=36=(16x)/(M)xx100impliesx=1.93`
Discussion
19.

Manganese dioxide oxidises hydrochloric acid to chlorine and gives manganous chloride and water.

Answer»

Solution :(a) The skeleton equation is written as
`MnO_(2)+HCl to MnCl_(2)+Cl_(2)+H_(2)O`
(b) FOCUSING on the oxidation numbers
`overset(+4)(Mn) overset(-2)(O_(2)) +overset(+1)(H) overset(-1)(Cl) to overset(+2)(Mn) overset(-1)(Cl_(2)) +overset(Cl_(2))+overset(+1)(H_(2)) overset(-2)(O)`
(c) Locating atoms undergoing CHANGE in oxidation numbers
`overset(+4)(Mn) O_(2)+H overset(-1)(Cl) to overset(+2)(MnCl_(2))+overset(0)(Cl_(2))+H_(2)O`
(d) Determining the change in oxidation number
(e) Cris-crossing these changes in the oxidation numbers
`MnO_(2)+2HCl to MnCl_(2)+Cl_(2)+H_(2)O`
(F) Balancing the atoms other than hydrogen and OXYGEN
`MnO_(2)+2HCl +2HCl to MnCl_(2)+Cl_(2)+H_(2)PO`
(g) Balancing the atoms hydrogen and oxygen `MnO_(2)+4HCl to MnCl_(2)+Cl_(2)+H_(2)O`
This is balanced equations.
Discussion
20.

Maneesh , a student of class XII, watched a programme onTV where it was being show how use of polythene bags blocked the sewer system and how sometimes the polythene bags thrown as garbage into the streets were swallowed by the animalsresulting into their death. Maneesh was highly upset and he discussed the problem with the class teacher to creater an awakening among his class-mates. After reading the above paragraph, answer the following question s : (a) What values do you attache to Maneesh's observation on TV and iscussion with his class teacher ? (b)What is the basic reason to the harmful effects of use of polythene bags ? What alternativedo you suggest ?

Answer»

Solution :(i) The use of polythene bags should be BANNED.
(ii)Even if we get some materials packed in polythene, the polythene USED in packing should not be thrown into the OPEN but properly disposed off.
(B) The basic reason for harmful effects of polythene is that it is non-biodegradable.The best alternative is to use paper bags or CLOTH bags.
Discussion
21.

Man made sources of air pollution are ?

Answer»

POPULATION INCREASE
Deforestration
War
POLLEN grains

Answer :A::B::C
Discussion
22.

Man dies in an atmosphere of carbon monoxide, because it

Answer»

combine with the `O_(2)` PRESENT in the body to form `CO_(2)`
reduces of the organic matter of tissues
combines with haemoglobin of blood, MAKING it INCAPABLE of binding`O_(2)`
dries up the blood 

Answer :C
Discussion
23.

Malonic acid and Succinic acid can be distinguised by :

Answer»

heat <BR>acidified `KMnO_(4)`
`Br_(2)` water
ammonia

Solution :
Discussion
24.

Malonic acid on heating gives :

Answer»

formic acid
acetic acid
oxalic acid
acetaldehyde

Solution :See some note worthy POINTS of ACIDS
Discussion
25.

Digital circuits can be made to be respective use of :

Answer»

SOLUTION :METAL IONS
Discussion
26.

Malleability and ductility of metals can be accounted due to

Answer»

the CAPACITY of layers of metal ions to slide over the other
the interaction of electrons with metal ions in the other
the presence of electrostatic force
the CRYSTALLINE STRUCTURE in metal

Solution :Melleability (BEATEN into sheets) and ductility (drawn into wires) of metals is due to capacity of layers of metal ions to slids over the other.
Discussion
27.

Maleic acid and fumaric acids are

Answer»

STRUCTURAL isomers
Geometrical isomers
Optical isomers
Conformational isomers

Answer :B
Discussion
28.

Malachite is basic copper carbonate. The only other elelment forming basic carbonate ore is

Answer»

Bi
Ba
Mn
Mo

Answer :B
Discussion
29.

Major source of methane in India is

Answer»

Rice FIELDS
Sugarcane PLANTATION
Wheat fields
Fruit orchards

Solution :Main sourceof METHANE in INDIA is reice fields
Discussion
30.

major products formed are ?

Answer»




Solution :electron WITHDRAWING GROUP activate RING towards ACCEPTING HYDRIDE
Discussion
31.

Major product of the reaction

Answer»




ANSWER :C
Discussion
32.

Major product of the given reaction is :

Answer»




ANSWER :C
Discussion
33.

Major product of the below mentioned rectionis …………… (CH_(3))_(2)C=CH_(2)overset(ICI)rarr

Answer»

2-chloro-1-iodo -2-METHYLPROPANE
1-chloro -2-iodo -2-methypropane
1,2 -dichloro-2-methypropane
1,2 - DIODO -2 -methylpropane

ANSWER :a
Discussion
34.

Major product of the below mentioned reaction is ….. (CH_(3))_(2)C=CH_(2)overset(ICI)to

Answer»

2-chloro-1-iodo-2-methypropane
1-chloro-iodo-2-methylpropane
1,2-dichloro-2-methylpropane
1,2-diiodo-2-mrthylpropane

Answer :A
Discussion
35.

Major product of given reaction is - O_2N-CH_2-undersetunderset(Cl)(|)CH-CH_3overset(overset(Theta)(O)H)underset(Delta)to Major product

Answer»

`O_2N-CH=CH-CH_3`
`O_2N-CH_2-CH=CH_2`
`O_2N-CH=undersetunderset(CL)(|)C-CH_3`
`CH_2=undersetunderset(NO_2)(|)C-CH_3`

ANSWER :A
Discussion
36.

Major Product is :

Answer»




ANSWER :B
Discussion
37.

Major component present in producer gas

Answer»

`H_(2)`
`N_(2)`
`CO`
`CO_(2)`

ANSWER :B
Discussion
38.

Mainly……….types of bond are present in organic compound

Answer»

ionic
co-ordinat covalent
metallic
covalent

Answer :D
Discussion
39.

Magnitude of surface tension is depend upon ?

Answer»

SOLUTION :Magnitude of INTERMOLECULAR ATTRACTION FORCE increases, surface tension increases.
Temperature increases surface tension decreases because kinetic energy of the molecules increases with temperature and effective intermolecular attraction decreases.
So, surface tension decreases.
Discussion
40.

Magnitude of london force is depend upon ?

Answer»

Solution :(i) London FORCE is inversely proportional to distance between MOLECULES. (ii) Its MAGNITUDE is depend upon polarisability of PARTICLE.
Discussion
41.

magnitude of enthalpy of neutralization is minimum for:

Answer»

`HCN+KOH`
`HCl+KOH`
`HCl+NH_(4)OH`
`HCN+NH_(4)OH`

ANSWER :d
Discussion
42.

Magnitudeof K.E. in anorbitis equal to

Answer»

Halfof thepotentialenergy
Twiceof thepotentialenergy
One fourththepotentialenergy
Noneof these

SOLUTION :K.E. of `e^(-)=(1)/(2)` of P.E.K.Eis alwayspositiveor K.E. `-((1)/(2) P.E)` = - Total energyof system
Discussion
43.

Magnisium powder burns in air to give:

Answer»

MgO only
MgO and `Mg(NO_(3))_(2)`
MgO and `Mg_(3)N_(2)`
`Mg(NO_(3))_(2)` and `Mg_(3)N_(2)`

Solution :`Mg+underset(O_(2)//N_(2))("AIR") OVERSET(Delta)to MgO +Mg_(3)N_(2)`
Discussion
44.

Magnetite is _______ regards magnetic behaviour.

Answer»


ANSWER :FERRIMAGNETIC
Discussion
45.

Magnetite, Fe_(3)O_(4) can be reduced to iron by heating with carbon monoxide according to the equation : Fe_(3)O_(4) + 4CO rightarrow 3Fe + 4CO_(2) {:("Molar mass", (g mol^(-1))), (Fe_(3)O_(4) , 232):} What mass of Fe_(3)O_(4) is required in order to obtain 5.0kg of iron if the process is 88% efficient?

Answer»

6.1kg
6.9kg
7.9kg
18kg

Answer :C
Discussion
46.

Magnetic susceptibility of a paramagnetic substance:

Answer»

is INDEPENDENT of temperature
increases with DECREASE of temperature
attain the maxima at null point
increases rapidly above Curie temperature

Answer :C
Discussion
47.

Magnetic moment of Cr^(+2)(Z=24),Mn^(+2)(Z=25) and Fe^(2+)(Z=26) are x,y,z. they are in order:

Answer»

xltyltz
xgtygtz
zltx=y
x=zlty

Answer :D
Discussion
48.

Magnesium reacts with an element (X) to form an ionic compound . If the ground state electronic configuration of (X) is 1s^(2) 2s^(2) 2p^(3) , the simplest formula of this compound is

Answer»

`Mg_(2)X_(3)`
`MgX_(2)`
`Mg_(2)X`
`Mg_(3)X_(2)`

Solution :`Mg^(2+) X^(+3) ` i.e., `Mg_(3)X_(2)`
THUS , OPTION (d) is CORRECT .
Discussion
49.

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^(2) 2s^(2) 2p^3, the simplest formula for this compound is

Answer»

`Mg_3X_2`
`Mg_2X_3`
`Mg_2X`
`MgX_2`

Solution :`X 1s^(2) 2s^(2) 2p^3`
So it is NITROGEN atom and its valency = 5,3
Mg is in SECOND group, So its valency = 2
` therefore `Formula will be `Mg_3N_2`
Discussion
50.

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3 the simplest formula for this compound is-

Answer»

`Mg_3X_2`
`Mg_2X_3`
`Mg_2X`
`MgX_2`

SOLUTION :ELECTRONIC configuration of X: `1s^2 2s^2 2p^3`
`:.` Valency of X = 3
Here, valency of MG = 2
Thus the COMPOUND will be `Mg_3X_2`.
Discussion