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.

The chloride of a metal 'M' contains 47.23% of the metal. 1 g of this metal displaced from a compound 0.88 g of another metal 'N'. Find the equivalent weight of 'M' and 'N' respectively.

Answer»

SOLUTION :31.77, 27.96
Discussion
2.

The chloride of a solid metallic element contains 57.89% by mass of the element. The specific heat of the element is 0.0324 cal "deg"^(-1)g^(-1). Calculate the exact atomic mass of the element.

Answer»

Solution :Equivalent mass of the ELEMENT `=(6.4)/(42.11)xx35.5=48.8`
APPROXIMATE ATOMIC mass `=(6.4)/(0.0324)=200`
Valency `=(200)/(48.8)=4`
Exact atomic mass `=48.8xx4=195.2`
Discussion
3.

The chloride of a metal has the formula MCl_(3). The formula its phosphate is:

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`M_(2)PO_(4)`
`MPO_(4)`
`M_(3)PO_(4)`
`M(PO_(4))_(2)`

ANSWER :B
Discussion
4.

The chloride ion is isoelectronic with potassium. The size of chloride ion is:

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LARGER than `K^+` ion
Smaller than `K^+` ion
Same as that of `K^+` ion
None of the above

Answer :A
Discussion
5.

The chloride ion is isoelectric with potassium. The size of chloride ion is

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Same as that of `K^(+)` ion
Larger than `K^(+)` ion
Smaller than `K^(+)` ion
None

Answer :B
Discussion
6.

The chloric acid and chlorates are:

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GOOD OXIDISING agents
Bleaching agents
Undergoes DISPROPORTIONATION on heating
All

Answer :D
Discussion
7.

The chlorate ion can disproportinate in basic according to reaction 2ClO_3^(-) hArr ClO_2^(-) +ClO_4^(-) calculate the value of equilibrium constant. Given E_(ClO_4^(-)//ClO_3^(-))^@=0.36 V and E_(ClO_3^(-)//ClO_2^(-))^@ =0.33 V at 298 K : -

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0.1
0.2
0.3
0.4

Solution :`E_"CELL"^@=E_(ClO_3^(-)//ClO_2^(-))^@ +E_(ClO_3^(-)//ClO_4^(-))^@`
=0.33-0.36=-0.03 V
`E_"cell"^@=0.06/n ` LOG K
-0.03 = `0.06/2` log K
`K=10^(-1)` = 0.1 M
Discussion
8.

The chloric acid and chlorates are :

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Good oxidizing agents
Bleaching agents
Undergo DISPROPORTIONATION on HEATING
None

Solution :(a) Good oxidizing agents(B) Bleaching agents(C ) Undergo disproportionation on heating
Discussion
9.

The chlorate ion can disproportinate in basic accordin to reaction 2ClO_(3)^(-)hArr ClO_(2)^(-)+ClO_(4)^(-) calculate the value of equilibrium constant. Given E_(clO_(4)^(-)//ClO_(3)^(-))^(O)=0.36v and E_(ClO_(3)^(-)//ClO_(2)^(-))^(O)=0.33V at298K

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`0.1`
`0.2`
`0.3`
`0.4`

SOLUTION :`E_("CELL")^(O)=E_(ClO_(3)^(-)//Clo_(3)^(-))^(O)+E_(ClO_(3)^(-)//ClO_(4)^('))^(O)`
`=0.33-0.36=-0.03V`
`E_("cell")^(O)=0.06/n log K`
`=-0.03=0.06/2log K`
`K=10^(-1)=0.1M`
Discussion
10.

The chirality of the compound

Answer»

R
S
Z
E

Answer :A
Discussion
11.

The chiral alkane of the lowest molecular mass not containing a ring and isotopes is

Answer»

`CH_3- cH_2 - UNDERSET(CH_3) underset(|)(CH) -CH_2 -CH_2 -CH_3`
`CH_3 -CH_2- underset(CH_3)underset(|)(CH)-CH {:(" "CH_3),("/"),("\"),(" "CH_3):}`
`CH_3 -CH_2- underset(CH_3)underset(|)(CD)-CH {:(" "CH_3),("/"),("\"),(" "CH_3):}`
Both(1) and (2)

Answer :D
Discussion
12.

The chief source of vitamin D is

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Fish liver OIL 
Spinach 
COW DUNG 
CITROUS FRUIT

Answer :A
Discussion
13.

The chief reaction(s) occurring in blast furnace during extraction of iron from haematite is / are :

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`Fe_(2)O_(3)+ 3CO to2Fe+3CO_(2)`
`FeO +SiO_(2) to FeSiO_(3)`
`Fe_(2)O_(3)+C to 2Fe+3CO`
`CaO+SiO_(2) to CaSiO_(3)`

Solution :In extraction of `Fe,Fe_(2)O_(3)` is primary reduced by CO below `710^(@)C` and ACIDIC impurity of `SiO_(2)` is removed is the form of `CaSiO_(3)` (slag).
Discussion
14.

The chief source of iodine in which it is present as sodium iodate is

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Sea weeds
Caliche
Carnallite
Iodine never exists as SODIUM iodate

Solution :Caliche is CRUDE chile salt petre `(NaNO_(2))` which contains about 0.02% iodine as sodium iodate `(NaIO_(3))`.
Discussion
15.

The chief ore of zinc is

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CRYOLITE
CALCITE
CALAMINE
Cuprite

Answer :C
Discussion
16.

The chief impurity present in bauxite is

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`SiO_(2)`
`Fe_(2)O_(3)`
`K_(2)SO_(4)`
NaF

Answer :B
Discussion
17.

The chief constituents of biological membranes are:

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Proteins
Waxes
Triglycerides
phospholipids

Answer :C
Discussion
18.

The chief constituent s of German Silver alloy are :

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`Cu, ZN, NI`
`Cu, Zn, AG`
`Zn, Cu, Cr`
`Zn, Cu, Sn`

Answer :A
Discussion
19.

The chief constituent of vinegar is

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Acetal
Acetic ACID
ETHANOIC acid
2 or 3

Answer :D
Discussion
20.

The chief component of cement that has property of setting quickly and acquiring considerable strength within a few days is

Answer»

Tricalcium SILICATE, `3CaO.siO_(2)`
Dicalcium silicate, `2CaO.SiO_(2)`
Tricalcium aluminate, `3CaO.Al_(2)O_(3)`
All the above

Solution :Tricalcium silicate sets quickly and develops considerable STRENGTH within a few DAYS. Dicalcium silicates sets slowly and develps appreciable strength after a month or so. Tricalcium aluminate sets instataneously in presence of water and imparts initial strength to the ceme.t
Discussion
21.

The chemistry of zero group elements is little known because

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They are LESS abundant
They have low IONISATION POTENTIAL
They have octet configuration
They have low boiling points

Answer :C
Discussion
22.

The chemistry of the actionoid elements is not so smooth as that of the lanthanoids. Justify this statements by giving some examples from the oxidation state of these elements.

Answer»

Solution :Lanthanoids SHOW a limited number of oxidation state, viz., +2, +3 and +4 (out of which +3 is the most common). This is because of a large energy GAP between 4f-, 5D- and 6s- subshells. The DOMINANT oxidation state of actinoids is also +3 but they show a number of other oxidation states also, Uranium (Z = 92) and plutonium (Z = 94), show +3, +4, +5 and +6, neptunium (Z = 93) shows +3, +4, +5 and +7, etc. This is due to small energy difference between 5-, 6d- and 7s-subshells of the actinoids.
Discussion
23.

The chemistry of the actionid elements is not so smooth as that of the lanthaoids. Justify this statements by giving some examplefrom the oxidation state of these elements.

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Solution :Lanthanoids show limitednumber of OXIDATION state, viz., `+2, +3, ` and `+4` ( out of which `+3` is most common.) This is because of LARGE energy gap between 4f and 5 d subshells. The dominant oxidation state of ACTINOIDS is also `+3` but they show a number of ther oidation states also, e.g., uranium `(Z = 92)` and PLUTONIUM `( Z= 94)` , show `+ 3, + 4, + 5 ` and `+6` , nuptunium `(Z = 94)` shows `+ 3, +4 , +5` and `+7` etc. This is due to small energy difference between 5f , 6d and 7s subshells of the actinoids.
Discussion
24.

The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

Answer»

Solution :Lanthanoids show (+2), (+3) and (+4) oxidation states. HOWEVER (+3) oxidation state is most dominant. Actinoid SHOWS oxidation states ranging from (+3) to (+7). The LARGE RANGE of oxidation states of actinoides as compared to lanthanoids is because of comparable energies of 5f, 6d and 7s orbitals. For example, the maximum oxidation state increases from (+4) in Th to (+5), (+6) and (+7) respectively in Pa, U and Np but decreases in succeeding ELEMENTS. However (+3) and (+4) ions tend to hydrolyze. Hence, it is unsatisfactory to review the chemistry of actinoids in terms on oxidation states.
Discussion
25.

The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactions occurring during the corrosion of iron in the atmosphere.

Answer»

Solution :
REACTIONS occuring during the corrosion:
`{:("Oxidation", Fe(s) to Fe^(2+)(AQ) + 2e^(-)),("Reduction", O_(2)(g) + 4H^(+) (aq) + 4e^(-) to 2H_(2)O(l)):}`
Atmospheric oxidation: `2Fe^(2+)(aq) + 2H_(2)O (l) + 1/2O_(2)(g) to Fe_(2)O_(3) (s) + 4H^(+)(aq)`
Discussion
26.

The chemistry of lithium is very much similar to that of magnesium even though they are placed in different groups. The reason is:

Answer»

Both have nearly the same SIZE
The ratio of their charge and size is nearly the same
Both have similar electronic configuration
Both are found TOGETHER in nature

Answer :B
Discussion
27.

The chemicals which carry different messages in the body between neurons and muscles are called_____.

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 transmitters
chemical messengers
chemical receptors
competitive INHIBITORS

ANSWER :B
Discussion
28.

The chemistry of benzene is characterised by whichfo the following types of reaction?

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Additomn
Elimination
Polymerisation
Substituion

Solution :`SE` REACTION is a CHARACTERSTIC of an AROMATIC COMPOUND.
Discussion
29.

The chemicals used for prevention of impregnation are called ......... prevention.

Answer»

ANTIFERTILITY drugs 
FERTILITY drugs 
SEXUAL drugs 
all of the GIVEN 

Solution :antifertility drugs
Discussion
30.

The chemical used in mental disease is

Answer»

ANTIPYRETICS
ANTIOXIDANTS
antibiotcs
tranquilizers

Answer :D
Discussion
31.

The chemical which cause allergy is called _______

Answer»


ANSWER :HISTAMINE
Discussion
32.

The chemical used in Holme's signals are

Answer»

Calcium NITRIDE and calcium CARBIDE
MAGNESIUM nitride and calcium phosphide
Calcium carbide and calcium phosphide
Calcium chloride and calcium CARBONATE

Answer :3
Discussion
33.

The chemical used for cooling in refrigeration is

Answer»

`CO_(2)`
`NH_(4)OH`
`NH_(4)Cl`
Liquid `NH_(3)`

SOLUTION :`NH_(3)` is HIGHLY volatile compound. When vapourized, liquid ammonia causes INTENSE cooling. Hence used as a coolant in ice factories and COLD storages.
Discussion
34.

The chemical used for cooling in refrigenaration or in manufacture of ice is:

Answer»

`CS_2`
`NH_4OH`
`NH_4Cl`
LIQUID `NH_3`

ANSWER :D
Discussion
35.

The chemical that undergoes self-oxidation and self-reduction in the same reaction

Answer»

BENZYL alcohol
acetone
formaldehyde
acetic acid

Answer :C
Discussion
36.

The chemical treatment of the ore for concentration is done in the case of

Answer»

aluminium
SILVER
copper
gold

Solution :Chemical treatment is done in the extraction of metals like Al, Ag, Au, ETC .
Al ore bauxite is leached with NAOH.
Au, Ag leached with NaCN.
For .Cu ore `(CuFeS_(2))` concentration done by froth FLOTATION. It is a physical method
Discussion
37.

The chemical that initiates electrolysis in Halls process is

Answer»

`Na_(3)AlF_(6)`
`Al_(2)O_(3)`
`Al(OH)_(3)`
`AlF_(3)`

SOLUTION :`Na_(3) AlF_(6) hArr 2NaF+AlF_(3) ` and
`AlF_(3) hArr Al^(3+) + 3F^(-)`
`Al_(2)O_(3) + 6F_(2) to 4AlF_(3)+……………….`
Discussion
38.

The chemical substances used to lower temperature of the body are called :

Answer»

ANTIBIOTICS
Analgesics
Antipyretics
Tranquillizers.

Answer :C
Discussion
39.

The chemical substances produced by living organisms to inhibit the growth or to kill microorganisms are called

Answer»

ANTIBIOTICS
analgesics
antacids
microbiostatic 

SOLUTION :antibiotics
Discussion
40.

The chemical substances that raise the pH value of stomach are called as _______.

Answer»

antacids
antipyretics
analgesics
antibiotics

Answer :A
Discussion
41.

The chemical substance which is used for disnfectants and presrvationof food is

Answer»

`SO_(2)`
BORIC ACID
PICRIC acid
ascorbic acid

ANSWER :A
Discussion
42.

The chemical substance which are used to prevent decompsition is/are

Answer»

antacids
antioxidant
antipyratic
analgesic and antipyretic

Answer :B
Discussion
43.

The chemical reactivity of ethylene is due to:

Answer»

Shot carbon to carbon BOND distance
High DOUBLE bond energy
Trigonal planar structure
Presence of `pi`-electrons

Answer :C
Discussion
44.

The chemical reagent used for leaching of gold and silver ores is

Answer»

SODIUM HYDROXIDE
POTASSIUM CYANIDE
Potassium cyanate
Sodium sulphate

Answer :B
Discussion
45.

The chemical reactions of an unsaturated compound 'M' are given below. Determine the possible structural formula of 'M'

Answer»




SOLUTION :N//A
Discussion
46.

The chemical reactions in which reactants require high amount of activation energy are genera11y

Answer»

SLOW
fast
INSTANTANEOUS
spontaneous

Solution :Higher the ACTIVATION ENERGY for REACTANTS, slower is the reaction.
Discussion
47.

The chemical reactions in which the reactants require high amount of activation energy are generally

Answer»

slow
fast
Instantaneous
None of these.

Answer :A
Discussion
48.

The chemical reactions in which reactants high amount of activation energy are generally

Answer»

SLOW
FAST
INSTANTANEOUS
SPONTANEOUS

ANSWER :A
Discussion
49.

The chemical reaction of K_(2)Cr_(2) O_(7) with following: (i) H_(2)SO_(4) "" (ii) KOH "" (iii) KI. (b) What is chromly chloride test ?

Answer»

Solution :`2K_(2)Cr_(2)O_(7)+8H_(2)SO_(4) overset(DELTA)to2K_(2)SO_(4) +2Cr_(2)(SO_(4))_(3)+8H_(2)O+3O_(2)`
`K_(2)Cr_(2)O_(7)+2KOH) to 2K_(2)CrO_(4)+H_(2)O`
(III) `K_(2)Cr_(2)O_(7)+7H_(2)SO_(2)+5HI to 4K_(2)SO_(4)+cr_(2)(SO_(4))_(3)+7I_(2)+7H_(2)O`
(b) When heated with CONC. HC or with a soluble chloride and conc. H2SO4 reddish brown vapour of chromyl chloride are produced.
`K_(2)Cr_(2)O_(7)+4KCl+ underset((Conc))(6H_(2)SO_(4)) overset(Delta)to underset("Chromyl Chloride")(2CrO_(2)Cl_(2))+6KSHO_(4)+3H_(2)O`
This reaction is used as a test for soluble chlorides and is called chromyl chloride test.
Discussion
50.

The chemical reaction that involves roasting process is :

Answer»

`Fe_(2)O_(3)+3COto2Fe+2CO_(2)`
`2Al+Fe_(2)O_(3)to2Fe+Al_(2)O_(3)`
`2Zns+3O_(2)to2ZnO+3SO_(2)`
`FeO+SiO_(2)toFeSiO_(3)`

ANSWER :3
Discussion