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 out the mostunlike form of polymerisation of CH_(2)=CH-CH=CH_(2)

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Solution :`(--overset(CH_(2))overset(||)(C)-overset(CH_(2))overset(||)C--)_(n)` , it SUGGESTS polymerisation OCCURS on the LOSS of vinylic HYDROGEN atom , which is notpossible .
Discussion
2.

Mark out the molcule(s) which can give the precipitate of AgBr instantaneously on treatment with AgNO_(3).

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SOLUTION :Both GIVE STABLE CARBOCATION.
Discussion
3.

mark out the enthalpy for the formation of carbon . Monoxide (CO) given , C(s)=1/2 O_(2)(g) to CO(g), DeltaH= -393 . 3 kJ // mol CO(g)+ 1/2 O_(2)(g) to CO_(2)(g), DeltaH= - 282 kJ//mol

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110.5 KJ/mol
676.1 kJ / mol
282.8 kJ / mol
300.0 kJ/mol

Solution :`C(s)+1/2O_(2)(G)TOCO(g)`
the abov equation can be OBTAINED by subraction of
`CO(g)+1/2O_(2)(g)to CO_(2)(g), DeltaH=-282.8kJ mol^(-1)`
from `C(s)+O_(2)(g)to Co(g), DeltaH=-393.3 kJ mol^(-1)`
`DeltaH_(t)=[+ 393.3 (282.8)] =110.5 kJ mol^(-1)`
Discussion
4.

Mark out the incorrect combination in the depolar force

Answer»

KCI in `H_(2)O` , ion depole forces
`C_(6)H_(6) " in"C CI_(4)`, DISPERSION forces
HCI in `CH_(3)CN`, ion DIPOLE forces
HCI in water, hydrogen bonding

Solution :(c,d) are CORRECT combination.
Discussion
5.

Mark outthe incorrect match of shape.

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`XeOF_(2)`- Trigonal planar
`ICl_(4)^(-)` Square planar
`[SbF_(5)]^(2-)`- Square phramidal
`NH_(2)^(-)`- Pyramidal

Solution :`XeOF_(2):sp^(3)d, `T-shaped
`NH_(2)^(-):sp^(3)` V-shaped
Discussion
6.

Mark out the correct statement(s) :

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Atomic RADII is a periodic property
On MOVING down the group, metallic character decreases and thus IONISATION energy increases.
On moving across the period, effective nuclear charge increases and thus ionisation energy increases.
Atomic volume of alkali METALS are highest in the respective periods.

Answer :A::C::D
Discussion
7.

Mark out the correct statement :

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ADDITION of mole of NaCI in 1L WATER increses boiling point
Addition of 1 mole of `CH_(3)OOH` to 1L water DECREASES boiling point
Addition of solid point
Addition of solid `CaCI_(2)" in ice "(0^(@)C)` decreasesfreezing point.

Solution :(a,b,c,d) are correct STATEMENTS.
Discussion
8.

Mark out the correct options:

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FIRST ionisation energy : `Ca gt K`
SECOND ionisation energy , `Mg gt Al`
Electron affinity : `S gt O`
Ionic radius : `SC^(3+) gtK^(+)`

Solution :`IE_1 (Al) < IE_1 (Mg)` [due to stable configuration of Mg]. After ionisation, configuration :
`Al : [NE] 3s^2 3p^0 "" Mg : [Ne] 3s^(1)`
Now, Al has stable configuration and higher effective nuclear charge, that.s why
`IE_(II) (Al) > IE_(II)(Mg)`
`Sc^(3+) and K^(+)` are isoelectronic speices, hence `Sc^(3+) < K^(+)`
Discussion
9.

Marble does not act as a sink for

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`H_(2)SO_(4)`
HCl
`HNO_(3)`
`O_(3)`

ANSWER :B::C::D
Discussion
10.

Marble acts as a sink for

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Metallicpollustants
`NH_(3)` pollutants
acidicpollutants
None of these

ANSWER :C
Discussion
11.

Many theories have been put forth to explain the nature of bonding in coordination compounds.Arrange the following ligands in the increasing order of their field strengths(as in the spectro chemical series)Cl^-,CO,H_2O,OH^-.

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SOLUTION :`ClgtOHgtH_2OgtCO`
Discussion
12.

Many species of insects developed resistance to DDT and it was discovered to have a high toxicity towards _________ .

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ANSWER :FISH
Discussion
13.

Many metals occur in the earth's crust as sulphides. To extract metals, the sulphide ores are first roasted in a reverberatory furnace in excess of air when metal oxide is formed and sulphur dioxide is released. Sulphur dioxide is a major air pollutant. It produces acid rain which damages crops, iron structures and buildings/histrorical monuments made up of marble. Now answer the following questions : (i) Name three important sulphide ores. (ii) What is acid rain ? How does it damage crops, iron structures and buildings made up of iron ? (iii) As a student of chemistry, what steps do you propose to control air pollution.

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Solution :(i) Galena (PbS) is the sulphide ore of lead, Zinic blende (ZnS) is the sulphide ore of zinc and copper pyrites `(CuFeS_(2))` is the sulphide ore of copper.
(ii) Rain water containing `H_(2)SO_(4) and HNO_(3)` is called ACID rain. `SO_(2)` produced as a result of roasting, first gets oxidised in air to form `SO_(3)` which subsequently dissolves in water to form `H_(2)SO_(4)` acid.
`{:(""2ZnS + 3 O_(2) rarr 2 ZnO + 2 SO_(2)" ",),(2SO_(2) + O_(2) underset("or METAL ions")overset("NO, root")(rarr) 2 SO_(3)),(""SO_(3) + H_(2)O rarr H_(2)SO_(4)):}`
The `H_(2)SO_(4)` thus produced increases the acidity of the soil which kills the microbes present in the soil and thus decreases the fertility of the soil.
`H_(2)SO_(4)` also reacts with iron and marble thereby damaging iron structures and building made upon of marble.
`{:(""Fe+H_(2)SO_(4) rarr FeSO_(4)+H_(2)" ",),(CaCO_(3) + H_(2)SO_(4)rarr CaSO_(4) + CO_(2) + H_(2)O):}`
(iii) `SO_(2)` produced as a result of roasting should not be released into the atmosphere. It should be collected and converted into useful PRODUCTS like `Na_(2)SO_(3), H_(2)SO_(4)`, etc.
`SO_(2) + 2 NaOH rarr Na_(2)SO_(3) + H_(2)O`
Discussion
14.

Many proicin-based biomaterlialist such as waste hair and feathers, can absorb heavy metal ions from waste water. It has been observed that metal uptake by these materials increases in alkaline condition. The enhanced uptake in alkaline conditions is due to:

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generation of many ligand sites in the protein molecules due to removal of `H^(+)`
availability of a high concentration of`OH^(-)` ions as ligands
increased cross-linkages in the protein CHAINS by formation of amide bonds
increase in solubility of the proteins

Solution :Alkaline medium enhances the ligand STRENGTH due to removal of `H^(+)`.
Discussion
15.

Many people died in London in 1952 as result of air pollution producing _____.

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Mist
smog
both A and B
NONE of these

Answer :C
Discussion
16.

Many of the carbohydrates are sweet in taste because of:

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They GIVE SUGARS on hydrolysis
Covalent BONDING
ELECTROVALENT bonding
Coordinate bonding

Answer :A
Discussion
17.

Manyindustrialprocesses usetransitionmetalortheircompoundsas catalyst . Why ?

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SOLUTION :Transitionmetalhas energeticallyavailabled orbitalsthat can acceptelectrons fromreactantmolecule or metalcan formbondfromreactantmolecularor metalcan formbondwithreactant moleculeusingits d electron . Forexampleinth catalytichydrogenationof analkenethealkenebondsto anactivesite by usingits `pi`ELECTRONS with an EMPTYD orbitalof thecatalyst.
Discussion
18.

Many countries Including USA express the temperature of atmosphere in degrees fahrenhelt, if you land in USA and temperature in 59^(@)F, what do you expect cold or hot. Compare with corresponding temperature in India.

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Solution :`.^(@)C=(5)/(9)(.^(@)F-32)=(5)/(9)(59-32)=15^(@)C`
It will be cold.
Discussion
19.

Many industrial processes use……… or their …... as catalyst.

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SOLUTION :TRANSITION METALS, COMPOUNDS
Discussion
20.

Manufacture of sulphuric acid by contact process is an example of ........... catalysis.

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SOLUTION :HETEROGENEOUS
Discussion
21.

In the manufacture of metallic sodium by the fused salt electrolysis ( Down's process ) a small amount of CaCl_(2) is added to :

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IMPROVE the electrical conduction
INCREASES the temperature of electrolysis
Bring down the melting temperature
Stabilize the metallic sodium

Solution :`CaCl_(2)` bring down the melt temperature from 1075 K to 850 K.
Discussion
22.

Manufacture of NaOH is done by:

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Caster-kellner process
Solvay process
Brine process
Mond process

Answer :A
Discussion
23.

Manufacture of cast iron is done in __________.

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BLAST furnace
bessemer converter
reverberatory furnace
modern VERTICAL retort

Answer :A
Discussion
24.

Manufacture of H_2 is made by:

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LANE's process
Bosch process
From NATURAL gas
All of the above

Answer :D
Discussion
25.

Manish went to market to buy fruit and vegetables. He was attracted to buy fruit and vegetables which were big in size. When he reached home, his mother told him that he had not brought good quality stuff. She explained to him that these had been grown to this size by using synthetic fertilizers and pesticides which are harmful for our health. After reading the above paragraph, answer the following questions : (i) What valueshave been expressed in the above paragraph ? (ii) How and why fertilizers and pesticides are harmful to human health. What solution do you suggest to the problem ?

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Solution :(i) The values expressed in the GIVEN paragraph are that the use of synthetic fertilizers and pesticides in the agriculture should be MINIMISED.
(ii) Fertilizers and pesticides are chemical COMPOUNDS which travel from soil to plant and then form plant to HUMAN causing health hazards. Pesticides have neurological EFFECTS on humans such as headache and hand tremors. Anumber of them are responsible for cancer.
The solution to the problem is that natural fertilizers like cow-dung etc. should be encouraged, i.e., production of organic food should be increased.
Discussion
26.

Mannose,sucrose, lactose, maltose, diastose.

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SOLUTION :Mannose . ITIS a MONOSACCHARIDE WHERES otherare DISACCHARIDE.
Discussion
27.

Manganese ions (Mn^(2+)) can be oxidised by Persulphate ions S_(2)O_(8)^(2-) according to the following half-equations, S_(2)O_(8)^(2-)+2e^(-) to 2SO_(4)^(2-) Mn^(2+)+4H_(2)O to MnO_(4)^(-)+4H_(2)O to MnO_(4)^(-)+8H^(+)+5e^(-) How many moles of S_(2)O_(8)^(2-) are required to oxidise 1mole of Mn^(2+)?

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`2.5`
`2.0`
`11.0`
`0.4`

ANSWER :A
Discussion
28.

Manganese steel contains

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`FE`
`C`
`MN`
`Cr`

Solution :Manganese STEEL (Mn -13 % ,C-1 %,Fe- 86%)
Discussion
29.

Manganese steel contains:

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FE + C + MN
Fe + C + AL
Fe + Mn
Fe + Mn + Cr

Answer :A
Discussion
30.

Manganese salt + PbO_(2) + conc. HNO_(2) rarrThe solutionhas purple colour The colour is due to

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`HMnO_(4)`
A lead salt
`MN(NO_(3))_(2)`
`H_(2)MnO_(4)`

Solution :`Mn^(2+)`is oxidised to `Mn^(2+)` forming`HMnO_(4)`
Discussion
31.

Manganese shows oxidation states from +2 to + 7. the Most strongly oxidising state known in aqueous solution is :

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`+2`
`+3`
`+4`
`+7`

ANSWER :D
Discussion
32.

Manganese exhibits oxidation states from

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`+ II "to" + VII`
`" + I to + VI"`
`+ I "to" + V`
`+ III "to" +V`

Answer :A
Discussion
33.

Manganese belongs to ……… of periodic table:

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s' block
p' block
d' block
f' block

Answer :C
Discussion
34.

Magnetite is :

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`2Fe_2O_3cdot3H_2O`
`FeS_2`
`Fe_3O_4`
`Fe_2O_3`

ANSWER :C
Discussion
35.

Man made sources of air pollution are

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POPULATION increase
deforestation
war
pollen grains.

Answer :A::B::C
Discussion
36.

Man dies, when nitrous oxide is inhaled in large quantities because it:

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Is poisonous
Causes LAUGHING hysteria
Decomposes haemoglobin
Reacts with ORGANIC tissues

Answer :B
Discussion
37.

Man dies in the atmosphere of CO because it :

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dries up the blood
combines with `O_2` PRESENT in the body
reduces the ORGANIC matter of tissues
Comines with the haemoglobin of blood, thereby making he later incapable of ABSORBING `O_2`

Answer :D
Discussion
38.

Man dies in an atmosphere of carbon monoxide because it

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combines with OXYGEN present in the body to form CARBON dioxide
increases the blood pressure
combines with haemoglobin of blood making it incapable of absorbing oxygen
reduces the organic matter of tissues.

Solution :Carbon MONOXIDE is highly poisonous. It is easily absorbed by blood and it FORMS carboxy-haemoglobin (a cherry red product) by combining with haemoglobin of the blood. This MAKES haemoglobin incapable as an oxygen absorber
Discussion
39.

Man dies in an atmosphere of carbon monoxide, because it :

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COMBINES with the `O_2` PRESENT in the body to form `CO_2`
Reduces the organic MATTER of tissues
Combines with HAEMOGLOBIN of blood, making it incapable of absorbing `O_2`
DRIES up the blood

Answer :C
Discussion
40.

Maltose on hydrolysis gives

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MANNOSE +glucose
Galactose + glucose
Glucose
Mannose + fructose

Solution :`underset("MALTOSE")(C_(12)H_(22)O_(11)+H_(2)O)underset("(from yeast)")overset("Maltose")tounderset("Glucose")(2C_(6)H_(12)O_(6))`
Discussion
41.

Maltose is hydrolysed in the presence of maltase to :

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Glucose
Glucose and fructose
Glucose and GALACTOSE
Fructose.

Solution :`underset("Maltose")(C_(12)H_(22)O_(11))OVERSET(H^(+))underset(" or Maltose")tounderset("Glucose")(C_(6)H_(12)O_(6))+underset("Glucose")(C_(6)H_(12)O_(6))`
Discussion
42.

Maltose contain

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2-4-`ALPHA` ACETAL BOND
1-2-`alpha`-acetal bond
1-4-`BETA` acetal bond
1-4-`alpha` acetal bond

Answer :D
Discussion
43.

Maltose is a :

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Polysaccharide
DISACCHARIDE
Trisaccharide

Solution :Disaccharide
Discussion
44.

Maltose is made up of :

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α-D glucose
α and β-D glucose
Glucose and fructose
Fructose only

Answer :A
Discussion
45.

Maltose consists of

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Only `alpha-D` GLUCOSE UNITS 
`alpha- and B-D` Glucose units 
Glucose and fructose 
Fructose only Polysaccharides 

Answer :A
Discussion
46.

Malti, a domestic servant of Mrs. Saroj, complained of severe pain in the chest while cleaning the utensils. Mrs. Saroj immediately took ker to the nearby hospital where she was diagnosed to be suffering from Angina Pectoris (angina pain). The doctor prescribed her the medicine commercially called sorbitrate. Mrs. Saro also supported her financially to buy the medicine. After reading the above passage, answer the following questions : (i) What values are displayed by Mrs. Saroj ? (ii) What is the cause of the disease Angina Pectoris ? (iii) What is sorbitrate made up of and how is it prepared ? (iv) How does sorbitrate work ? (v) Give one more use of the chemical present in sorbitrate.

Answer»

Solution :(i) By providing much needed help to Malti, Mrs. Saroj DISPLAYED the age old moral values that one should always be sympathetic towrds people in PAIN and distress and help them with cash and kind.
(ii) The reduced blood flow to the heart muscle due to blockage of coronary arteries by plaque (consisting of cholesterol and fatty acids) causes angina pain.
(iii) The sorbitrate medicine is made up of nitroglycerine which is prepared by nitration of glycerol with a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`.
(iv) Sorbitrate (i.e., nitroglycerine) breaks down in the body to generate nitric oxide (NO) which rapidly diffuses through the artery wall to the muscle tissues. In response, muscle tissue relaxes, the blood vessel expands. As a result, blood flow increases, blood pressure drops and the chest pain is relieved.
(v) The chemical present in sorbitrate is nitroglycerine. When it is absorbed over Kieselguhr (a kind of POROUS earth), it forms the well known explosive CALLED dynamite which is widely used for shooting oil wells, building roads, dams and tunnels in rocks.
Discussion
47.

Maltose an hydrolysis produces

Answer»

`BETA`-D-glucose
`ALPHA`-D-glucose
`beta`-D-fructose
`alpha`-D-fructose

Answer :B
Discussion
48.

Maltose and glucose are

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OXIDISING sugar
REDUCING sugars
first is oxidising and SECOND is reducing sugar
both are non-reducing sugar

Answer :B
Discussion
49.

Find f(sqrt2) and f(-sqrt3) for the function

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FORMIC ACID
ACETIC acid + `CO_2`
OXALIC acid
Acetaldehyde

Answer :B
Discussion
50.

Malonic acid on heating gives :

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FORMIC ACID
ACETIC acid + `CO_2`
OXALIC acid
Acetaldehyde

Answer :B
Discussion