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.

CaSO_(4).2H_(2)O overset("Heat")(to)

Answer»

SOLUTION :`CaSO_(4).2H_(2)O overset("Heat")(to) CaSO_(4) 1//2 H_(2)O + 3//2 H_(2)O`
Discussion
2.

CaSO_(4) can be prepared by reaction of any calcium salt with

Answer»

`H_(2)SO_(4)`
Soluble sulphate
Both (1) and (2)
NONE of these

Solution :`Ca_(3)(PO_(4))_(2)+3H_(2)SO_(4)to3CaSO_(4)+2H_(3)PO_(3)`
Discussion
3.

Cars pass a point travelling at 45.0(5), 47.0(7) 50.0(9), 53.0(4) and 57.0(1)km h^(-1). The numbers in brackets give the number of cars with respective velocities. Calculate the RMS velocity and average velocity.

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SOLUTION :RMS VELOCITIES 49.06km`H^(-1)` ,AVERAGE velocities 48.96km`h^(-1)`
Discussion
4.

Carry over the following reaction mechanisms . Addition of HCN toCH_(3) CHO

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SOLUTION :ADDITION of HCN to ACETADEHYDE .
Discussion
5.

Carry over the following reaction mechanisms . Bromination of alkene

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SOLUTION :Brominatin of ALKENE to GIVE BROMO ALKANE .
Discussion
6.

Carry over the following reaction mechanisms . Formation of alkyl bromide with benzoylperoxide as radical initiator .

Answer»

Solution :In this reaction , benzoyl peroxide acts as a radical INITIATOR . The mechanism INVOLVES free RADICALS . <BR> `H_(2)C = CH + H- Br overset ("Benzoyl ") overset ( "Perioxide ")(to) CH_(3) - CH_(2) - Br `
Discussion
7.

Carnallite is a double chloride of K and Mg containing 38.86% of water. 0.458 g of it gave 0.71 g AgCl and 0.666 g of it gave 0.27 g magnesium pyrophosphate (Mg_2P_2O_7). Calculate the percentage of KCl in the carnallite.

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SOLUTION :Only `MgCl_2` can GIVE `Mg_2P_2O_7`. Thus, the percentage of `MgCl_2` can be determined.
`2MgCl_2toMg_2P_2O_7`
`0.27g of Mg_2P_2O_7-=(190xx0.27)/(222)=0.231 G of MgCl_2`
`% of MgCl_2=(0.231xx100)/(0.666)-=34.68%`
`% of HCl-=100-(34.68+38.86)-=26.46%`
Discussion
8.

Carius is the name of

Answer»

A CHEMIST
A BIOLOGIST
A sealed capillary tube
A LONG - necked round-bottom FLASK

SOLUTION :Casrius is sealed capillaryube.
Discussion
9.

Cardice is

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`C_(3)O_(2)`
Solid `CO_(2)`
`C Cl_(4)`
Mixture of CO and `CO_(2)`

Solution :CARDICE is solid `CO_(2)`
Discussion
10.

Carcinogens which can cause

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MALERIA
RESPIRATORY illness
CHLOROSIS
MINAMATA

Solution :Respiratory illness
Discussion
11.

Carcinogenic water pollutant is

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VOLATILE AROMATIC compounds
non volatile aromatic compounds
methane
Formaldehyde

ANSWER :B
Discussion
12.

Carcinogenic pollutant is

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CO
`SO_2`
BENZOPYRENE
PAN

Solution :Benzopyrene
Discussion
13.

Carcinogenic pollutant among the following is

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CO
`SO_(2)`
BENZOPYRENE
PAN

Answer :C
Discussion
14.

Carboxylic acids do not give the characteristic properties of individual

Answer»

`-COOH` group
alkyl group
Carbonyl group
none of these

Solution :SEE some note WORTHY points of acids
Discussion
15.

Carboxylic acids do not give the characteristic properties of

Answer»

`-COOH` GROUP
R-group
`gt C = O` group
none of the ansers is correct

Solution :`C = O` group, due to resonance in `-OVERSET(O)overset(||)(C) - OH` group
Discussion
16.

Carboxylic acids are more acidic than phenol and alcohol because of

Answer»

INTERMOLECULAR hydrogen bonding
formation of dimers
highly ACIDIC hydrogen
resonance STABILIZATION of their conjugate base

Solution :Resonance stabilization of their conjugate base i.e., carboxylate ions
Discussion
17.

Carboxylic acids are functional isomers of

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ALCOHOLS
esters
both alcohols and esters
acid anhydride

Solution :CARBOXYLIC ACIDS and esters are FUNCTIONAL isomers.
Discussion
18.

Carboxylic acid reacts with diazomethane to yield :

Answer»

amines
alcohols
esters
amides

Solution :SEE PROPERTIES of ACIDS
Discussion
19.

Carboxyhaemoglobin is less stable than oxyhaemoglobin.(T/F)

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ANSWER :F
Discussion
20.

Carboxy hemoglobin is 100 times more stable than oxy-hemoglobin complex.

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SOLUTION :FALSE statement (It is 300 time more stable)
Discussion
21.

Carboxy haemoglobin is _____ times more stable than oxyhaemoglobin

Answer»

100
200
300
400

Answer :C
Discussion
22.

Carbonyl compoundsespecially ketones undergoreduction to form .................

Answer»

SOLUTION :SECONDARY ALCOHOLS
Discussion
23.

Carbonyl compounds can generally be converted to hydrocarbons by

Answer»

`H_(2)//PT`
`LiAIH_(4)`
`N_(2)H_(4)-KOH`
`K_(2)Cr_(2)O_(7)-H_(2)SO_(4)`

ANSWER :C
Discussion
24.

Carbonmonoxide is a neutral oxide, but it is defined as a Lewis base. Why?

Answer»

Solution :Carbonmonoxide in water does not form any oxy acid. Hence it is CALLED a neutral oxide. HOWEVER, carbonmonoxide acts as an electron pair donor. It acts as a ligand in metal coordination compounds. Hence, carbonmonoxide is defined as an EXAMPLE of a Lewis base.
Discussion
25.

Carbondioxide does not support combustion but a burning magnesium ribbon continues to burn in it. Why?

Answer»

Solution :Magnesium reduces CARBONDIOXIDE to CARBON and THEREFORE continues to burn in `CO_(2)`.
`2Mg+CO_(2)RARR 2MgO+C`
Discussion
26.

Carbonates ores are mostly of

Answer»

GROUP 1 elements
group 2 elements
transition elements
group 13 elements

Answer :B
Discussion
27.

Carbonates of alkaline earth metals are ...... in water.

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SOLUBLE
Insoluble
Partially soluble
Fairly soluble

Answer :B
Discussion
28.

Carbonates and bicarbonates of alkali metals soluble in water and are thermally stable. Give reason.

Answer»

SOLUTION :As the ELECTROPOSITIVE character INCREASES down the group, the stability of the carbonates and bicarbonates increases. The is is due to the decrease in POLARISING power of alkali metal cations.
Discussion
29.

Carbonated water is an example for ……………

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SOLUTION :LIQUID solution
Discussion
30.

Carbon tetrachloride has no dipole moment because of

Answer»

Its regular TETRAHEDRAL structura
Its palnar structure
Similar SIZE of caron and chlorine atoms
Similar ELECTRON affinities of CARBON and chlorine

Answer :A
Discussion
31.

Carbon tetrachloride does not give a white precipitate upon heating with silver nitrate solution. Is it correct ?

Answer»

SOLUTION :Yes it is correct. Carbon tetrachloride `(C Cl_(4))` is a completely non-polar convalent compound whereas silver nitrate is ionic in NATURE. THEREFORE, they are not expected to react and a white precipitate of silver chloride will not be formed.
Discussion
32.

Carbon shows allotropy. The various allotropic forms of carbon can be broadly classified into 2 classes a) Crystalline form b) Amphorous form Diamond and Graphite are the 2 crystalline forms of carbon. In diamond, the carbon atoms are arranged tetrahedrally while in graphite, the carbon atoms are arranged inregular hexagons in flat parallel layers When diamond is heated at 1800 to 2000^(@)C in valency. It is converted into

Answer»

Coke
Fullerene
GRAPHITE
Lamp black

Solution :DIAMOND `overset(1800-2000^(@)C)UNDERSET("in vaccum")to` Graphite
Discussion
33.

Carbon shows allotropy. The various allotropic forms of carbon can be broadly classified into 2 classes a) Crystalline form b) Amphorous form Diamond and Graphite are the 2 crystalline forms of carbon. In diamond, the carbon atoms are arranged tetrahedrally while in graphite, the carbon atoms are arranged inregular hexagons in flat parallel layers In (CO_(3)^(2-)), carbon atoms shows

Answer»

`SP^(2)` hybridisation
`sp^(3)` hybridisation
sp hybridisation
`sp^(3)d` hybridisation

Solution :
NUMBER of `sigma` bonds = 3
Number of `pi` bonds = 1
Discussion
34.

Carbon monoxide is pollutant as it

Answer»

Inactivates NERVES
INHIBITS GLYCOLYSIS
Combines with oxygen
Combines with HAEMOGLOBIN

Answer :D
Discussion
35.

Carbon monoxide is harmful to human beings as it

Answer»

is carcinogenic
is ANTAGONISTIC to `CO_(2)`
has higher affinity for haemoglobin as COMPARED to oxygen
is DESTRUCTIVE to `O_(3)`

Solution :Carbon monoxide is harmful to human beings as it hs higher affinity for haemoglobin as compared to oxygen
Discussion
36.

Carbon monoxide is allowed to expand isothermally and reversibly from 10 m^(3) to 20 m^(3) at 300 K and work obtained is 4.754kJ. Calculate the number of moles of carbon monoxide.

Answer»

Solution :`w= -2.303 nRT log. (V_(2))/(V_(1))` ,brgt `-4754= -2.303 xx N xx 8.314 xx 300 log. (20)/(10)`
Discussion
37.

Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?

Answer»

Solution :`CO and CO_2`gas are released by the buring of various types of fuel. Carbon monoxide is poisonous where as carbon DIOXIDE is not poisonus in its nature.
Carbon monoxide REACTS with hemoglobin and produce carboxyhemoglobin complex. This complex is more stable than oxyhemoglobin. Carboxyhemoglobin that carries 3-4% concentration reduces the ability of blood to absorb oxygen.
This oxygen deficiency, results into headache, weak eyesight, nervousness and cardiovascular disorder. DUE to the increase in its proportion, the death rate is high. Carbon dioxide is NON veritable. Its high concentration is very harmful.
Discussion
38.

Carbon monoxide gas is more dangerous than carbon dioxidc gas. Why?

Answer»

Solution :Carbon monoxide gas combines with haemoglobin to FORM a very stable COMPOUND known as carboxy-haemoglobin. When its concentration in blood reaches 3-4%, the OXYGEN carrying capacity of the blood is greatly reduced. This results into headache, NERVOUSNESS and sometimes death of the person. On the other hand `CO_2` does not combine with haemoglobin and hence it is less harmful than CO.
Discussion
39.

Carbon monoxide, emitted by automobiles prevents transport of oxygen in body due to

Answer»

Copmbinbg with oxygen to form carbon dioxide
DESTRUCTION of haemolglobin
PREVENTING reaction between oxygen and haemoglobin
FORMING stable COMPOUND with haemoglobin

Solution :Refer Comprehencsive Review
Discussion
40.

Carbon monoxide combines with hemoglobin of red blood corpuscles to form _____

Answer»


ANSWER :CARBOXYHAEMOGLOBIN
Discussion
41.

Carbon monoxide (CO) is harmful to man because

Answer»

it forms CARBOLIC acid
it GENERATES excess `CO_2`
it is carcinogenic.
it competes with `O_2` for hemoglobin.

Solution :CO is highly TOXIC and imparis respiration. CO combine with hemoglobin of BLOOD and reduces it `O_2` carry capacity
Discussion
42.

Carbon monoxide binds with the hemoglobin and forms carboxy-hemoglobin complex.

Answer»

SOLUTION :TRUE STATEMENT
Discussion
43.

Carbon monooxide is readily absorbedby ammoniacal curpouschloridesolution but carbon dioxide is not. Explain .

Answer»

Solution :DUE to the presence of a lone PAIR of electrons on CARBON in `CO`, in acts as a Lewis base (or ligand) and and thus forms a soluble complexwith ammoniacal curpous chloridesolution.
`CaCl + NH_(3) + :CO rarr underset("Solublecomplex")([Cu(CO)NH_(3)]^(+)) Cl^(-)`
On the other hand,`CO_(2)`does not act as a Lewisbase since it does not have a lone pair of electrons on the carbonatom and hence does NOTDISSOLVE in ammoniacal cuprous chloride solution.
Discussion
44.

Carbon has the highest catenation character because

Answer»

C is more electronegative 
C has higher IONISATION POTENTIAL VALUE 
C has only ONE STABLE isotope 
`C-C` bond is strong

Answer :D
Discussion
45.

Carbon has large number of allotropes of which crystalline forms are diamond, graphite and fullerenes. Amorphous forms are coal, coke wood charcoal animal charcoal, lamp black, gas carbon, petroleum coke, sugar charcoal (Atomic radius of C = 0.77A^(@)) In graphite which have several fused hexagonal ring of benzene the hybridization state of each carbon atom and the bond order of each carbon-carbon bond are respectively

Answer»

SP, 1.5
`sp^(2)`, 1.5
`sp^(2)`, 1.33
`sp^(3)`, 1.5

Solution :In GRAPHITE `Ctosp^(2)` HYBRIDISATIONS
Discussion
46.

Carbon has large number of allotropes of which crystalline forms are diamond, graphite and fullerenes. Amorphous forms are coal, coke wood charcoal animal charcoal, lamp black, gas carbon, petroleum coke, sugar charcoal (Atomic radius of C = 0.77A^(@)) The inter layer distance in graphite is

Answer»

Very small, the layers being tightly packed
Ten times GREATER than the covalent radius of carbon
APPROXIMATELY 4.5 times the covalent radius of carbon
The same as the covalent radius of carbon

SOLUTION :C - CB. L is `to1.42A^(@)`
layer distance `to3.35A^(@)`
Approximately `4(1)/(2)` times the covalent radius of carbon
Discussion
47.

Carbon freeradicalsare _______

Answer»

CARBOCATION
CARBANION
CATION
FREE radical

ANSWER :A
Discussion
48.

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

Answer»

Carbon
Oxygen
Both carbon and oxygen
Neither carbon nor oxygen

Solution :REACTION 1:`C+O_2to 2CO`
`2xx12` G carbon COMBINE with 32G of oxygen.
Hence, EQUIVALENT mass of carbon `=(2xx12)/(32)xx2=6`
Reaction 2: `C + O_2 to CO_2`
12 g carbon combine with 32 g of oxygen.
Hence, Equivalent mass of carbon `=(12)/(32)xx8=3`
Discussion
49.

Carbon (electroniccondiguration1s ^(2)2s^(2)2p^(2)) exhibitstetravalency.thisis dueto ______.

Answer»

ELECTROSTATICFORCES
allotropy
hybridizationof ORBITALS
AFFINITY forhydrogen

ANSWER :C
Discussion
50.

Carbon disulphide, CS_(2) can be made from by-product SO_(2). The overall reaction is 5C+2SO_(2)rarrCS_(2)+4CO How much CS_(2) (in kg) can be produced from 440 kg of waste SO_(2) with 60 kg of coke if the SO_(2) conversion is 80%? [Give answer after rounding off to the next integer.]

Answer»


ANSWER :61
Discussion