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.

Two members of a homologous series have different

Answer»

GENERAL formula
molecular weights
methods of preparation
chemical properties.

Answer :B
Discussion
2.

Which of the following will not show geometrical isomerism ?

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Solution :For GEOMETRICAL isomerism , it is ESSENTIAL that each carbon atom of the double BOND must have different substituents. Now option (d) does not SHOW geometrical isomerism SINCE it has two `CH_3`groupson the same carbon atom of the double bond.
Discussion
3.

Which of the following molecule does not obey the octet rule and also has lone pair on the central atom.

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`C Cl_4`
`PCl_3`
`NH_3`
`8Cl_4`

ANSWER :D
Discussion
4.

Which of the following cannot be prepared by wurtz reaction in good yield?

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`(CH_3)_2CHCH_2CH(CH_3)_2`
`(CH_3)_2CHCH_2CH_2CH(CH_3)_2`
`CH_3CH_2C(CH-3)_2CH_2CH_3`
`(CH_3)_3C CH_2 CH_2 CH_3 `

SOLUTION :
Discussion
5.

Which combination is not give molecular orbital from 1s - 1s and 1 s - 2s ? Why ?

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SOLUTION :Combination of 1S - 2s is not GIVE molecular orbital because the energy difference is more between them.
Discussion
6.

Which of the following orders regarding the bond order is correct?

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`O_(2)^(-)GT O_(2) gt O_(2)^(+)`
`O_(2)^(-)gt O_(2)^(+)`
`O_(2)^(-)gt O_(2) LT O_(2)^(+)`
`O_(2)^(-) lt O_2gt O_(2)^(+)`

ANSWER :B
Discussion
7.

The study of toxicity of organo metallic compounds is termed as

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CLASSIFICATION
categorization
eutrophication
SPECIATION

ANSWER :D
Discussion
8.

Which of the follwing has noreaction with water?

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Ba
Sr
Be
Mg

Answer :3
Discussion
9.

When zeolite which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with:

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`Ca^(2+)` IONS
`Mg^(2+)` ions
both `Ca^(2+)" and "Mg^(2+)` ions
`SO_(4)^(2-)` and CHLORIDE ions

Solution :`Na_(2)AI_(2)Si_(3)O_(8)xH_(2)O+Ca^(2+)" or "Mg^(2+)`
`RARR CaAL_(2)Si_(3)O_(3).xH_(2)O+2Na^(+)`
or `MgAI_(2)Si_(3)O_(8).xH_(2)O`
Discussion
10.

What indicated by figure ?

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SOLUTION :Here anhydrous `CaCl_2` in evaporating dish and pressure is same in manometer. The MOISTURE in BOX is ABSORB by `CaCl_2` so there is not EQUILIBRIUM.
Discussion
11.

Which of the following reaction are disproportionstion reaction and comproportionaton reactions ? Ag^(2+)Ag to2Ag^(+)

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Solution :`overset(+2)(AG^2)+overset(0)(Ag)tooverset(+1)(2Ag^+)`
The OXIDATION numbers of the reaction `Ag^(2+)` are +2 and 0 respectively and the oxidation NUMBER is INTERMEDIATE between the oxidation numbers +2 and 0. So it is a comproportionation reaction.
Discussion
12.

Which of the following is more reactive than diphenyl regarding electrophilic aromatic substitution?

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Solution :Groups like -COOR, -CH3, ETC.. ACTIVATES the ring at O, P POSITION and promote electrophilic aromatic SUBSTITUTION than diphenyl.
Discussion
13.

Which of the following steps is not correct in the mechanism of electrophilic substitution of benzene?

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Generation of electrophile LIKE `X^(+),R^(+),RC^(+)O,NO_(2)^(+),`etc.
Attack of electrophile RESULTING in the formation of arenium ion in which ONE of the carbon is `sp^(3)` hybridised.
Addition of PROTON on benzene ring to give carbocation.
Removal of proton from `sp^(3)` carbon atom to restore aromatic character.

Solution :Arenium ion is formed as intermediate by the attack of electrophile not by addition of proton. Proton is substituted by electrophile.
Discussion
14.

When 40 mL ofa 0.1M weak monoacid base is titrated with 0.16M HCI, the pH of solution at the end point is 5.23. Calculate K_(b). What will be the pH if 15 mL of 0.12M NaOH is added to the resulting solution ?

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ANSWER :`1.775xx10^(-5), 9.1621;`
Discussion
15.

The type of hybridizationof boron in diborane is

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SP-HYBRIDIZATION
`sp^(2)`-hybridization
`sp^(3)`-hybridization
`sp^(3)d^(2)`-hybridization

Answer :C
Discussion
16.

Which one of the following alkaline earth metal carbonates is thermally most stable?

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SOLUTION :Thermal STABILITY increases with decreases in cationic SIZE.
Discussion
17.

Total number of moles of HCl reacts with one mole of borax to converts all borons to boric acid?

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ANSWER :2
Discussion
18.

X is pale yellow solid, It hydrolyess to POCl_(3) in moist air and finally gets converted into phosphoric acid. X exists as an ionic solid. The total number of atoms present in its cation is.

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Solution :`underset((X))(PCl_(5))+H_(2)OtoPOCl_(3)+2HCl,`
`POCl_(3)+3H_(2)OtoH_(3)PO_(4)+3HCl`
In the solid STATE, `PCl_(5)` (X) EXISTS as `[PCl_(4)]^(+)[PCl_(6)]^(-)` in which the CATION has 5 atmos (4Cl+1P).
Discussion
19.

The two type of bonds present in B_(2)H_(6) are covalent and

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ionic
co-ordinate
hydrogen bridge bond
METALLIC bond

Solution :Two type of BONDS present in `B_(2)H_(6)` are covalent, hydrogen bridge bond
Discussion
20.

Whichof thefollowingis anexampleofamorphousubstance ?

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GLUCOSE
GLASS
ALUM
COMMON salt

Answer :B
Discussion
21.

Which of the following is the most reactive towards electrophilic substitution reaction ?

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ANSWER :D
Discussion
22.

Which of the following is paramagnetic ?

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`O_(2)`
`N_(2)`
`H_(2)`
`He_(2)`

ANSWER :a
Discussion
23.

What are total dissolved solids (TDS)?

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Solution :(i) Most of the salts are soluble in water. It include CATIONS like calcium, magnesium, sodium, POTASSIUM. iron and anions like carbonate, bicarbonate, chloride, sulphate, phosphate and nitrate.
(ii) USE of drinking water having TDS (total dissolved solids) concentration higher than 500 ppm causes POSSIBILITIES of irritation in stomach and INTESTINE
Discussion
24.

The volume of a gas measured at 27^@C and 1 atm pressure is 10 litres. To reduce the volume to 5 litres at 1 atm pressure, the temperature required is

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75K 
150 K 
225 K 
300 K 

ANSWER :B
Discussion
25.

What is the volume of 1.5 N H_2O_2 ?

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SOLUTION :Normality of `H_2O_2= (H_2O_2 "volume STRENGTH")/5.6`
`therefore` Volume strength= 1.5 X 5.6 = 8.4 `H_2O_2`
Discussion
26.

which of the following products is not formed in above reaction : products are

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`H-underset(O)underset(||)(C)-H`
`OHC -underset(O)underset(||)(C)-CH_(2)-CHO`
`OHC-CH_(2)-underset(O)underset(C)-CH_(2)-CHO`
`H-underset(O)underset(||)(C)-underset(O)underset(||)(C)-H`

SOLUTION :
Discussion
27.

Which of the following reactions is not correct for preparation of alkanes ?

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`(CH_3)_2CHCl OVERSET(LiAlH_4)to (CH_3)_2CH_2`
`(CH_3)_2C Cl overset(LiAlH_4)to (CH_3)_3CH`
`(CH_3)_2 CHCl overset(NaBH_4) to (CH_3)_2CH_2`
`(CH_3)_3C Cl overset(NaBH_4)to (CH_3)_3CH`

Solution :`LiAlH_4` reduces `1^@` and `2^@` alkyl HALIDES but BRINGS about DEHYDROHALOGENATION of `3^@` alkyl halides . In CONTRAST, `NaBH_4` reduces both `2^@` and `3^@` alkyl halides
Discussion
28.

Which of the following has maximum density ?

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`O_2` at `25^@C` and 1 ATM 
`O_2` at `0^@C` and 2 atm
`O_2` at `273^@C` and 1 atm 
`O_2` at `0^@C` and 1 atm 

ANSWER :B
Discussion
29.

Write name of Fe_(2)(SO_(4))_(3) according to stock notation method.

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SOLUTION :IRON (III) SULPHATE
Discussion
30.

What is bulk properties of matter ? Give examples.

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Solution :Definition : The properties associated with a COLLECTION of a large number of atoms IONS and MOLECULES.
Example : (i) An individual molecule of a liquid does not oil but the BULK boils. (ii) Collection of water molecules have wetting properties, individual molecules do not wet.
Discussion
31.

Write formula and name about alkyl groups

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Solution :(A) In branched chain hydrocarbons the alkyl group present as a branch.
Alkyl groups (-R): The removed of one hydrogen atom from the molecule of an alkane GIVES an alkyl group.
`underset("alkane")(R- H) overset(-H)rarr underset("alkyl group")(-R)`
Nomenclature (Ane + AYL = Alkyl) this SMALL alkyl groups are in branced chain hydrocarbons: In a branched chain compound small chains of carbon ATOMS are attached at one or more carbon atoms of hte parent chain. The small carbon chains (branches) are called alkyl groups: For example: (i) `CH_(3) - underset(underset(CH_(3))(|))(CH) - CH_(2) - CH_(3)`
In four carbon containing parent chain, the `-CH_(3)` (Methyl) alkyl group is in branch.
(ii) `CH_(3) - underset(underset(CH_(2)CH_(3))(|))(CH) - CH_(2) - overset(overset(CH_(3))(|))(CH) - CH_(3)`
In five carbon containing parent chain the `-CH_(3) and -CH_(2)CH_(3)` groups in branch.
(B) Nomenclature of alkyl group: In order to name such compounds,the name of alkyl groups are prefixed to the name of parent alkane.
General formula alkyl group: `C_(n) H_(2n + 1)`
Name of alkyl group : (Ane + yl) = Alkyl. One H is less in alkyl group than correspond in alkane.

The branch and unbranch structures of propyl, butyl and pentyl are as following.
(a) Structure and name of propyl: `C_(3)H_(7)`
(i) `underset("n- propyl")(CH_(3) CH_(2) CH_(2))`- (ii) `underset("isopropyl")(CH_(3) - underset(underset(CH_(3))(|))(CH)-)`
(b) Structure and name of butyl: `C_(4)H_(9)`
(i) `underset("n -butyl")(CH_(3) - CH_(2) - CH_(2) - CH_(2)-)`
(ii) `underset("isobutyl")(CH_(3) - underset(underset(CH_(3))(|))(CH) - CH_(2) -)`
(iii) Secondary butyl: `CH_(3) - CH_(2) - overset(|)(C )H - CH_(3) OR CH_(3) - CH_(2) - underset(underset(CH_(3))(|))(CH) -`
(c ) Structure and names of pentyl: `C_(5)H_(11)`
(i) `underset("n-pentyl")(CH_(3) - CH_(2) - CH_(2) - CH_(2) - CH_(2) -)`
(ii) Second pentyl: `{:(CH_(3)- CH- CH_(2)- CH_(2) - CH_(3)),("|"),(CH_(3) - CH_(2)- CH_(2) - CH-),("|"),(""CH_(3)):}` OR `{:(CH_(3)- CH_(2) - CH- CH_(2) - CH_(3)),("|"),(CH_(3)CH_(2)- CH- ),("|"),(""CH_(2)CH_(3)):}`
(iii) Isopentyl `CH_(3) - underset(underset(CH_(3))(|))(CH) - CH_(2) - CH_(2)- OR (CH_(3))_(2) CH CH_(2) CH_(2)-`
(iv) Neopentyl
`CH_(3) - underset(underset(CH_(3))(|))overset(overset(CH_(3))(|))(C ) - CH_(2) - OR (CH_(3))_(3) C- CH_(2) -`
Discussion
32.

What reaction will take place if a silver coin is put in dillute HNO_(3)?

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ANSWER :`3Ag+4HNO_(3)to3AgNO_3+NO+2H_(2)O`
Discussion
33.

What is the equivalent weight of SnCl_(2) in the reaction, SnCl_(2) + Cl_(2) to SnCl_(4)? (mol.wt. of SnCl_(2)=190)

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95
45
60
30

Solution :a) `SnCl_(2) + Cl_(2) to SnCl_(4)`
EQ. wt. of `SnCl_(2)` = Eq. wt of `Cl_(2)`
`therefore` (190)/(E_(1)= (71)/(35.5)` or `E_(1) =95`
Discussion
34.

What is covalency ?

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SOLUTION :NUMBER of electrouns SHARED between the atoms during covalent bond formation.
Discussion
35.

When zeolite which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with

Answer»

`CA^(2+)` ions
`MG^(2+)` ions
both `Ca^(2+)" and "Mg^(2+)` ions
`SO_(4)^(2-)` and CHLORIDE ions

Solution :`Na_(2)AI_(2)Si_(3)O_(8).xH_(2)O+Ca^(2+)" or "Mg^(2+)`
`rarr CaAL_(2)Si_(3)O_(3).xH_(2)O+2Na^(+)`
or `MgAI_(2)Si_(3)O_(8).xH_(2)O`
Discussion
36.

The values of electronegativity of atoms A and B are 1.2 and 4.0 respectivity . The % ionic character of the A-B bond is

Answer»

`50%`
`72.24%`
`55.3%`
`43%`

SOLUTION :ACCORDING to Hannay and Smith equation,
% ionic character = `16 (chi_(A) - chi_(B)) + 3.5(chi_(A) - chi_(B))^(2)`
` 16 (4-0 - 1.2) + 3.5 (4 .0 - 1.2)^(2)`
`= 16 xx2.8 + 3.5 xx (2.8)^(2)`
`= 44.8 + 27 .44 = 72.24`
Discussion
37.

What is K_(c) for the following equilibrium when the equilibrium concentration of each substance is : [SO_(2)]= 0*60 M, [O_(2)]= 0*82 M and [SO_(3)] = 1*90 M ? 2 SO_(2) (g) + O_(2) (g) hArr 2 SO_(3) (g) K_(c) = [SO_(3)]^(2)/([SO_(2)]^(2) [O_(2)])= (1*90M)^(2)/((0*60 M)^(2) (0*82M)= 12*229 )=12*229 M^(-1) or 12* 229 L mol^(-1)

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SOLUTION :` K_(c) = [SO_(3)]^(2)/([SO_(2)] [O_(2)]) = (1.90 M)^(2)/((0*60 M) ^(2) (0.82M))=12*229 M ^(-1) or 12*229 L " mol"^(-1)`
Discussion
38.

When the Normality and Molarity is same ?

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SOLUTION :If the MOLECULAR mass and equivalent mass of SOLUTE is same than molarity EQUALS to normality. e.g. : HCL, NaOH
Discussion
39.

which one of the following does not have intramolecular hydrogen bonding?

Answer»

water
o-nitophenol
Salicylaldehyde
Salicylic acid

Answer :a
Discussion
40.

Which of the following is true about the charge acquired by p-type semiconductors ?

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POSITIVE
NEUTRAL
negative
depends on CONCENTRATION of p impurity

Solution :All p-type semiconductors are neutral.p only indicates that holes MOVE LIKE positive charge , i.e., towards cathode.
Discussion
41.

Which of the following reaction is oxidation and which is reduction ? {:((i),2H_2O+2e^(-),rarr,2OH^(-)+H_2),((ii), Al,rarr,Al^(3+)+3e^(-)),((iii) , Fe^(3+),rarr,Fe^(2+)-e^(-)),((iv),2O^(2-)+C,rarr,CO_2+4e^(-)),((v) ,Br^(-),rarr,1//2Br_2+e^(-)),((vi), 2H_2O-4e^(-), rarr,4H^(+)+O_2):}

Answer»


ANSWER :Reduction reaction (i),(ii) and OXIDATION reaction (ii) , (iv) , (V) , (vi)
Discussion
42.

Water gas is produced by

Answer»

PASSING steam through a RED hot coke bed.
Saturating hydrogen with moisture.
Mixing oxygen and hydrogen in the ratio of 1:2.
Heating a mixture of `CO_2` and `CH_4` in petroleum refineries.

Solution :WATER GAS is made by BLOWING steam through the layer of incandescent coal.
`underset"Steam"(H_2O) + underset"Red hot"C to underset"Water gas"(H_2+CO)`-28 kcal
Discussion
43.

Which of the following statements is not true about classical smog?

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Its main components are produced by the action of sunlight on emissions of auto mobiles and factories.
Produced in cold and humid climate.
It contains compounds of reducing nature.
It contains smoke, fog and sulphur dioxide.

Solution :A mixture of `SO_2`, PARTICULATES and high humidity in cold condition in the atmosphere in habits classical SMOG. A fog of `H_2 SO_4` droplets FORMED condenses on the particulates to form the smog. It is of reducing nature. The gases which are released by automobiles and factories are not responsible for classical smog.
NOTE: Gases released by automobiles and factories are not responsible for classical smog.
Discussion
44.

Which of the following is the strongest base

Answer»

`CH_(3)COO^(-)`
`ClCH_(2)COO^(-)`
`Cl_(2)CH" "COO^(-)`
`Cl_(3)C""COO^(-)`

Solution :The conjugate of the STRONGEST ACID is the WAKER base
Discussion
45.

Which of the following is not soluble in NaOH?

Answer»

`Fe(OH)_(3)`
`Zn(OH)_(2)`
`AL(OH)_(3)`
`Sn(OH)_(2)`

SOLUTION :`Fe(OH)_(3)` does not dissolve in NaOH
Discussion
46.

Write the IUPAC names of the following halides a. CH_(2)BrCHCl CH_(2)CH_(2)Cl b. CH_(3)C Cl_(2)CHBr.CH_(3) c. CH_(3)-underset(CH_(3))underset("|")"CB"r-underset(Cl)underset(|)CH-underset(CH_(3))underset("|")"CH"-CH_(3)

Answer»

Solution :a. Isobutyl BROMIDE b. Propylidene chloride
c. Propylidene iodide d. Bromoform
E. CARBON TETRA chloride.
Discussion
47.

Which of the following are biodegradable pollutants

Answer»

Pesticides
Domestic wastes
Mercuric salts
Lead compounds

Answer :B
Discussion
48.

Which of following reacts most voilently with water

Answer»

Na
K
Cs
Rb 

ANSWER :C
Discussion
49.

x mole HI is taken in 10 lit vessel and heated . If the equilibrium concentration of H_(2 (g)) is 0.1 mol - lit^(-1) , value of x and mass of I_(2) at equilibrium respectively are

Answer»

2, 254 G
4 , 127 g
4 , 254 g
2 , 127 g

ANSWER :C
Discussion
50.

What will be DeltaH for the reaction, CH_(2)Cl_(2)rarrC+2H+2Cl? (B.E. of C-H and C-Cl bonds are "416 kJ mol"^(-1) and "325 kJ mol"^(-1) respectively)

Answer»

832 KJ
1482 kJ
650 kJ
1855 kJ

Solution :`H-OVERSET(H)overset(|)UNDERSET(Cl)underset(|)C-ClrarrC=2H+2Cl`
`DeltaH=SigmaB.E._(R)-SigmaB.E._(P)`
`=2xxB.E.(C-H)+2xxB.E.(C-Cl)`
`=2xx416+2xx325="1482 kJ"`
Discussion