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.

AlF_3 is soluble in HF only in presence of KF. It is due to the formation of…

Answer»

`AlH_3`
`K[AlF_3H]`
`K_3[AlF_3H_3]`
`K_3[AlF_6]`

SOLUTION :`AlF_3 + 3KF to K_3[AlF_6]`
Discussion
2.

Aldol condensation proceeds by carbon- carbon bond formation between an enolation donor and a carbonyl acceptor For each of the following aldol products (1 through 4)Match the donor and acceptor compound.

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Solution :`A) Ph-CH_(2)-CHO to`DONOR& Acceeptor

It has `alpha` -H `so donor
B) `HCHO to `Acceptor

It has`alpha -H""alpha -H""because` donor
Ph -CHO TONO `alpha-H ""because "AcceptorBased onProducr"`(D)
has`alpha- H`andactas donor
Discussion
3.

Aldol addition is nucleophllic addition reaction of carbonyl compound with enolate or enolate ion of aldehyde and ketones. The reaction between two molecules of acetaldehyde takes place as following in the presence of base.Driving force for the aldol condensation is :

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Formation of conjugated carbonyl COMPOUND as a product
Formation and stability of ENOLATE ion
Only the REACTIVITY of carbonyl group for NUCLEOPHILIC addition
all of these

Answer :b
Discussion
4.

Aldol addition is nucleophllic addition reaction of carbonyl compound with enolate or enolate ion of aldehyde and ketones. The reaction between two molecules of acetaldehyde takes place as following in the presence of base. Which carbonyl compound wll be most reactiove for aldol addition ?

Answer»

`C_(6)H_(5)-CH_(2)-CHO`
`CH_(3)-CHO`

Answer :C
Discussion
5.

Aldol addition is nucleophllic addition reaction of carbonyl compound with enolate or enolate ion of aldehyde and ketones. The reaction between two molecules of acetaldehyde takes place as following in the presence of base. Simple aldol addition is given by :

Answer»

`C_(6)H_(5)CHO`
`CX_(3)-CHO`
`O_(2)N-Ph-CHO`
`C_(6)H_(5)-CH_(2)-CHO`

Answer :D
Discussion
6.

Aldehydes and ketones are.............isomers.

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ANSWER :FUNCTIONAL ISOMERS
Discussion
7.

Aldehyde can be isomertic functionally with

Answer»

ALCOHOLS
ethers
esters
Ketones

Answer :D
Discussion
8.

Aldehyde and ketones may be prepared by reductive cleavage of carbon-carbon double bonds. A particularly useful reagent for this purpose is ozone under reductive condition in the formation of carbonylcompounds. products Which of the following products is not formed in above reaction.

Answer»



`H-UNDERSET(O)underset(||)(S)-H`
`CH_(3)-underset(O)underset(||)(C)-H`

Solution :
Discussion
9.

Alcohols undergo acid catalysed elimination reactions to produce alkenes. Because water is lost in the elimination , this reaction is called dehydration reaction. Secondary and tertiary alcohols always give E1 reaction in dehydration. Primary alcohols whose beta-carbon is branched also give E1 reaction. The reactivity of alcohol for elimination reaction is tertiary alcohol gt secondary school gt Primary alcohol. Identify the product in the given reaction :

Answer»




ANSWER :C
Discussion
10.

Alcohols undergo acid catalysed elimination reactions to produce alkenes. Because water is lost in the elimination , this reaction is called dehydration reaction. Secondary and tertiary alcohols always give E1 reaction in dehydration. Primary alcohols whose beta-carbon is branched also give E1 reaction. The reactivity of alcohol for elimination reaction is tertiary alcohol gt secondary school gt Primary alcohol. Which of the following dehydration product (major ) is incorrect ?

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`CH_3-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-oversetoverset(OH)(|)CH-CH_3underset(DELTA)OVERSET(conc.H_2SO_4)to CH_3-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH=CH_2`
`CH_3CH_2CH_2CH_2OHunderset(Delta)overset(conc.H_2SO_4)to CH_3-CH=CH-CH_3`

ANSWER :B
Discussion
11.

Alcohols reacts with Grignard reagent to form

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Alkanes
Alkenes
Alkynes
All

Solution :`C_(2)H_(5)OH+CH_(3)MgI RARR CH_(4)+C_(2)H_(5)OMgI`.
Discussion
12.

Alcohols, phenols and acids can be distinguished by reaction with

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`NaHCO_(3)`
`NaOH`
`FeCl_(3)`
all the above

Solution :(a) ALCOHOLS and phenols can be distinguished by NaOH and `FeCl_(3)` solution (b) Phenol and acid can be distinguised by `NaHCO_(3)`
Discussion
13.

Alcohols of low molecular weight are

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Soluble in water
Soluble in water on heating
Insoluble in water
Insoluble in all solvents

Solution :These QUESTION are BASED UPON FACTS or formulae
Discussion
14.

Alcohols may act as

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Oxidisingagent
Reducing agent
LEWIS base
BRONSTED acid

Solution :Alcohols can act as Lewis base.
`R-underset(..)OVERSET(..)(O)-H+H^(+) RARR R-underset(..)overset(H)overset(|)(O^(+))-H`
Alcohols can also act as Bronsted acid.
`R-underset(..)overset(..)(O)-H rarr R-underset(..)overset(..)(O):^(-)+H^(+)`
Discussion
15.

Alcohols are weaker acids than water. Why ?

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Solution :In alcohol , the alkyl group has `+ I` EFFECT. It INCREASES the electron density on the OXYGEN atom. As a RESULT, the release of `H^(+)` ion from alcohol is more difficult than from water or alcohol is a weaker ACID.
Discussion
16.

Dehydrohalogenation involves removal of the halogenn atom together with a hydrogen atom from carbon adjacent to the one with halogen atom. Alcoholic KOH is used for dehydrohalogenation. According to saytzeff's rule, when two alkenes may be formed, the alkene which is most substituted is the major product. Q. The ease of dehydrohalogenation for different halogens is in the order

Answer»

dehydrogenation
dehalogenation
dehydration
dehydrohalogenation

Answer :D
Discussion
17.

Alcoholic solution of KOH is a specific reagent for

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DEHYDRATION
dehydrogenation
dehydrohalogenations.
DEHALOGENATION.

ANSWER :C
Discussion
18.

Alcoholic beverages are made of

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Ethanol
Acetic acid
Formic acid
None of these

Answer :A
Discussion
19.

Alcohol on refluxing with K_2 Cr_2 O_7 gives .....

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Ester
Aldehyde
SUGAR
CARBOXYLIC ACID

Solution :Carboxylic acid
Discussion
20.

Alcohol on refluxing with K_(2)Cr_(2)O_(7) gives ...............

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SOLUTION :CARBOXYLIC ACID
Discussion
21.

Alcohol level in blood is determined by the reaction with K_2Cr_2O_7 solution in acidic medium. Calculate the blood level in mass percent if 10 " mL of " 0.05 M solution of K_2Cr_2O_7 is required for the reaction of a 10.0 g sample of blood.

Answer»

SOLUTION :Mole method:
Balance the redox reaction of `C_2H_5OH` with `Cr_2O_7^(2-)` in acidic MEDIUM (Mw of `C_2H_5OH=46g)`
`cancel6e^(-)+Cr_2O_7^(2-)to2Cr^(3+)]xx2`
`underline(C_2H_5OHto2CO_2+cancel(12e^(-))`
`underline(C_2H_5OH+2Cr_2O_7^(2-)to4Cr^(3+)+2CO_2)`
For 2 " mol of "`Cr_2O_7^(2-)-=1 " mol of "C_2H_5OH` is required `10xx0.05xx10^(-3) " mol of "Cr_2O_7^(2-)`
`-=(10xx0.05xx10^(-3))/(2) " mol of "C_2H_5OH`
`-=25xx10^(-5)` " mol of "`C_2H_5OH`
`-=25xx10^(-5)xx46g of C_2H_5OH`
Percent of alcohol `-=(25xx10^(-5)xx46)/(10)xx100=0.115%`
Equivalent method:
`Cr_2O_7^(2-)-=C_2H_5OH`
`1mEq-=1mEq`
`10xx0.05xx6m" Eq of "Cr_2O_7^(2-)=3 mEq-=3 m" Eq of "C_2H_5OH`
`3 mEq-=3 mEq`
`3m" Eq of "C_2H_5OH-=3xx10^(-3)eq-=3xx10^(-3)xx(46)/(12)g`
Percent of alcohol `-=(3xx10^(-3)xx46xx100)/(12XX10)-=0.115%`
Discussion
22.

Alcohol fermentation is brought about by the action of

Answer»

`CO_(2)`
`O_(2)`
INVERTASE
Yeast

Solution :Both invertase and ZYMASE are CONTAINED in yeast.
Discussion
23.

AlCl_3 molecule is exist in which form ?

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Dimer
Polymer
Monomer
None of the above

Answer :A
Discussion
24.

AlCl_(3) on hydrolysis gives

Answer»

`Al_(2)O_(3).H_(2)O`
`Al(OH)_(3)`
`Al_(2)O_(3)`
`ACl_(3).6H_(2)O`

Solution :`AlCl_(3)` on hydrolysis GIVES `Al(OH)_(3)` and HCL.
`AlCl_(3)+3H_(2)O RARR Al(OH)_(3)+3HCl`
Discussion
25.

AlCl_(3) is usedas a catalyst in _______.

Answer»

WURTZ SYNTHESIS
Saponificationof ESTERS
WILLIAMSON synthesis
friedelcraftreaction

Answer :D
Discussion
26.

AlCl_3 is a Lewis acid.

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ANSWER :1
Discussion
27.

AlCl_(3) is a Leis acid than BCl_(3).

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ANSWER :WEAKER
Discussion
28.

AlCl_(3) is

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An hydrous and COVALENT
An hydrous and IONIC
Covalent and basic
CO - ordinate and acidic

Solution :An hydrous and co-valent.
Discussion
29.

AlCl_(3) fumes in moist air because

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It is very volatile
It is covalent
HCl is formed in moist air
It is HIGHLY hygroscopic

Solution :Anhydrous `AlCl_(3)` FUMES in moist air because of hydrolysis.
`AlCl_(3)+3H_(2)O rarr Al(OH)_(3)+3HCl`
HCl so produced fumes in moist air.
Discussion
30.

AlCl_(3) exists as dimer because

Answer»

Al has greater IONISATION potential
Al has larger radius
High CHARGE in nucleus
INCOMPLETE p-subshells

Solution :`AlCl_(3)` exist as DIMER because of incomplete p-subshell.
Discussion
31.

AlCl _(3) is …………. Compound whereas PCl_(5)is …………… compound in terms of octer rule.

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SOLUTION :electron-deficient, hypervalnet
Discussion
32.

Al[BH_(4)]_(3) contains how many 3 centered -2e^(-) bonds.

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SOLUTION :
Discussion
33.

Al^(3+) ions replace Na^+ ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to bex xx 10^23 . The value of x approximately is

Answer»


ANSWER :3
Discussion
34.

Al^(3+) ions replace Na^(+) ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x10^(23). The value of xapproximately is

Answer»


ANSWER :2
Discussion
35.

Al_(2)O_(3) formation involves large quantity of heat evolution which makes its use in

Answer»

DEOXIDISER
CONFECTIONARY
INDOOR photography
THERMITE welding

Solution : During the thermite welding LARGE heat liber ated
Discussion
36.

Al_(2)O_(3) can be converted to anhydrous AlCl_(3) by heating

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`Al_(2)O_(3)` with `Cl_(2)` gas
`Al_(2)O_(3)` with HCl gas
`Al_(2)O_(3)` with `NACL` in solid state
a mixture of `Al_(2)O_(3)` and carbon in dry `Cl_(2)` gas

Answer :D
Discussion
37.

Al_(2)O_(3) can be converted to anhydrous AlCl_(3) by heating :

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A mixture of `Al_(2)O_(3)` and CARBON in dry `Cl_(2)` gas
`Al_(2)O_(3)` with HCl gas
`Al_(2)O_(3)` with `Cl_(2)` gas
`Al_(2)O_(3)` with NaCl in SOLID state

Solution :`Al_(2)O_(3)+C+Cl_(2)overset(DELTA)rarr` anhydrous `AlCl_(3)`
Discussion
38.

Al_(2)O_(3)becomes anhydrousAlCl_(3) upon heating

Answer»

with `NaCl`
with DRY `Cl_(2)` and C
with `Cl_(2)`
with dry `HCl` gas

Solution :`Al_(2)O_(3) + 3Cl_(2) + 3C overset("Heat")rarr2AlCl_(3) + 3 CO`.
Discussion
39.

Al_(2)(SO_(4))_(3)+NH_(4)OH rarr X,X is

Answer»

a white GELATINOUS precipate
insolunle in excess of `NH_4OH`
SOLUBLE in excess of NaOH
amphotericin nature

Solution :`Al_(2)(SO_4)_3+NH_(4)OH rarr (NH_4)_(2)SO_(4)+Al(OH)_3`
X is Al `(OH_3)` which is a white gelatinous precipitate soluble in excess of NaOH and is amphoteric nature
Discussion
40.

Al reacts with conc. H_(2)SO_(4) and forms Uses of B & Al and their compounds

Answer»

`SO_(3)`
`SO_(2)`
`H_(2)`
`S(VAP)`

Answer :B
Discussion
41.

Al is inert in nature , because ……

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It has HIGH electropositivity .
It forms hard LAYER of `Al_2O_3` on the surface.
Strong REDUCING agent
It forms ALLOY with Cu.

Answer :B
Discussion
42.

Al having double conductivity as compared to which metal ?

Answer»

Solution :Al has DOUBLE CONDUCTIVITY as compared to Cu.
Discussion
43.

Al and Ga have nearly the same covalent radius, incorrect reason is

Answer»

 GREATER shielding effect of s-electrons of GA ATOMS 
Poor shielding effect of s-electrons of Ga atoms 
 Poor shielding effect of d-electrons of Ga atoms
 Greater shileding effect of d-electrons of Ga atoms 

Solution : Due to poor shielding effect of d electrons of Ga atoms
Discussion
44.

Al and Ga have nearly the same covalent radii, because of

Answer»

GREATER shielding EFFECT of 's' electrons of 'Ga' ATOMS
POOR shielding effect of 's' electrons of 'Ga' atoms
Poor shielding effect of 'd' electrons of 'Ga' atoms
Greater shielding effect of 'd' electrons of 'Ga' atoms

Answer :C
Discussion
45.

aK_(2)Cr_(2)O_(7)+bKCl+cH_(2)SO_(4) to xCrO_(2)Cl_(2)+yKHSO_(4)+zH_(2)O The above equation balances when

Answer»

a=2,b=4,c=6 and x=2, y=6, z=3
a=4,b=2,c=6 and x=6,y=2,z=3
a=6,b=4,c=2 AD x=6, y=3,z=2
a=1,bb=4,c=6 and x=2, y=6, z=3

Answer :D
Discussion
46.

aK_(2)Cr_(2)O_(7)+bKCI+cH_(2)SO_(4)rarrxCrO_(2)CI_(2)+yKHSO_(4)+zH_()O The above equation balance when

Answer»

A=2,b=4,c=6 and x=2 , y =6 , z=3
a=4b=2c=6and x=6 y =2 z=3
a=6b=4c=2 and x=6y=3z=2
a=1b=4c=6 and x=2y=6z=3

Solution :
Discussion
47.

Air pollution is not caused by

Answer»

Pollen GRAIN
Hydroelectroc power
Industries
Automobiles

Solution :AIR POLLUTIONN is not CAUSED by hyfdroelectroic power
Discussion
48.

Air pollutants that produce photochemical oxidants include:

Answer»

`CO_(2), CO and SO_(2)`
`N_(2)O, NO and HNO_(3)`
`O_(2), l_(2)` and `HNO_(3)`
`O_(3),Cl_(2)` and `SO_(2)`

Answer :B
Discussion
49.

Air pollutants that produce photochemical oxidants include

Answer»

`CO_(2) CO and SO_(2)`
NITROUS oxide ,nitric oxide and nitric ACID
Oxygen, chlorine nad nitric acid
Ozone, chlorine and suphur dioxide.

Solution :Air pollutant that produce PHOTOCHEMICAL oxidatns INCLUDE nitrous oxide, nitric oxide andnitric acid
Discussion
50.

Air is cooled from 25^@C to 0^@C. Calculate the decrease in rms speed of the molecules.

Answer»


ANSWER :about 4%
Discussion