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.

Which of the following electrolytes will be most effective in the coagulation of gold sol :

Answer»

`NaNO_(3)`
`K_(4)[Fe(CN)_(6)]`
`Na_(3)PO_(4)`
`MgCl_(2)`

ANSWER :D
Discussion
2.

Transition elements are ul"more electropositive" than group 1 elements

Answer»

SOLUTION :LESS ELECTROPOSITIVE
Discussion
3.

The type of hybridisation of nitrogen in aliphatic amines is

Answer»

`SP^(3)`
`sp^(2)`
sp
Unhybridised

Solution :`sp^(3)`
Discussion
4.

Which of the following statements is wrong about galvanic cells

Answer»

cathode is the positive ELECTRODE
cathode is the NEGATIVE electrode
electrons FLOW from anode to cathode in the external CIRCUIT
reduction occurs at cathode

Discussion
5.

What is difference between sol, gel and emulsion?

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SOLUTION :
Discussion
6.

What is the effect of temperature on the rate of a reaction ?

Answer»

SOLUTION :As temperature INCREASES rate of reaction increases. For every `10^(@)C` or 10 K increases in temperature rate of reaction gets DOUBLED.
Discussion
7.

Two elements X and Y combine to form two compounds XY_(2) and X_(3)Y_(2),0.1 mol of XY_(2) weighs 10 g and 0.05 mol of X_(3)Y_(2) weighs 9 g. Calculate the atomic masses of X and Y.

Answer»

Solution :Suppose ATOMIC MASSES of X and Y are x and y respectively.
Molar mass of `XY_(2)=x+2y`
But 0.1 mol of `XY_(2)` weighs = 10 g
`therefore"Molar mass of"XY_(2)=100""therefore""x+2y=100"…(i)"`
But 0.05 mol of `X_(3)Y_(2)`weigh = 9 g
`therefore"Molar mass of "X_(3)Y_(2)=(9)/(0.05)=180""therefore""3x+2y=180"...(ii)"`
Subtracting eqn. (i) from eqn. (ii), we get
`{:(,2x=80,or,x=40,,),("Substituting in eq. (i),",40+2y=100,or,2y=60,or,y=30):}`
Discussion
8.

Which has minimum solubility

Answer»

`Br_(2)S_(3)`<BR>`Ag_(2)S`
CoS
PbS

Solution :Fajan's RULE is APPLIED
Discussion
9.

Which of the following sets of elements are called aerogens ?

Answer»

He, NE, Ar
F, CL, Br
O, S, Se
N, P, As

Solution :As He, Ne , Ar are present in AIR they are also called aerogens
Discussion
10.

Why are the atomic masses of most of the elements factional?

Answer»

Solution :This is because atomic masses are the RELATIVE masses of atoms as COMPARED with an atom of `C-12` isotope TAKEN as 12.
Discussion
11.

Which of the following does not reduce Benedict's solution

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SUCROSE
Aldehyde
glucose
Fructose

Solution :Sucrose is a NON REDUCING sugar it does not give any TEST with Benedict's solution.
Discussion
12.

Which catalyst is used in preparation of orlon ?

Answer»

Peroxide
ZIEGLER Natta
Alkyl Mercaptant
WATER

SOLUTION :Peroxide
Discussion
13.

Which of the following represents a synthetic detergent ?

Answer»

`C_(15)H_(31)COOK`
`CH_(3)[CH_2]_(16)COONA`

None of these

ANSWER :C
Discussion
14.

When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is

Answer»

acetophenone
benzaldehyde
benzophenone
acetaldehyde

Answer :A
Discussion
15.

The regent who can't be used to detect the presence of both CO_(3)^(2-) and HCO_(3)^(-) in a mixture is -

Answer»

`CaCl_(2)`
`SrCl_(2)`
`AgNO_(3)`
`MgCl_(2)`

Answer :D
Discussion
16.

What would happen if the protective tin coating over an iron bucket is broken in some places?

Answer»

Solution :In such a CASE, IRON corrodes faster than it does in the absence of TIN as OXIDATION potential of Fe is greater that that of Sn.
Discussion
17.

What happens when (i) n-butyl chloride is treated with alcoholic KOH. (ii) bromobenzene is treated with Mg in the presence of dry ether. (iii) chlorobenzene is subjected to hydrolysis. ((iv) ethyl chloride is treated with aqueous KOH. (v) methyl bromie is treated with sodium in presence of dry ether. (vi) methyl chloride is treated with KCN?

Answer»

SOLUTION :
Discussion
18.

Which of the following fibres are made of polyamides ?

Answer»

Wool
NATURAL SILK
Rayon
Nylon

Solution :Rayon is CHEMICALLY TREATED chellulose.
Discussion
19.

Which of the following represents number average molecular mass ?

Answer»

`M=(sumN_iM_i^2)/(sumN_i)`
`M=(sumN_iM_i)/(sumN_i)`
`M=(sumN_iM_i^2)/(sumN_iM_i)`
`M=(sumN_iM_i)/(sumN_i)`

ANSWER :B
Discussion
20.

Which of the following molecule(s)/ion(s) can show optical isomerism ?

Answer»

`[Pt(bn)_(2)]^(2+)`
`[PtCl_(2)(NH_(3))_(2)]`
`[FE(EDTA)]^(-)`
`[Fe(en)_(3)]^(3+)`

ANSWER :A::C::D
Discussion
21.

When freshly precipitated Fe(OH)_3 is boiled with water in the presence of few drops of dil HCl, a hydrated ferric oxide sol is obtained. This method is termed

Answer»

Dialysis 
Peptization 
ultrafiltration 
Electro dispersion 

SOLUTION :`Fe(OH)_(3_(s)) OVERSET(FeCl_(("sol")))(rarr)Fe(OH)_(3_(("sol")))`
The process of converting a ppt into COLLOIDAL sol by shaking it with D.M in the presence of SMALL amount of electrolyte is called peptisation.
Discussion
22.

Which of the following is tertiary alcohol

Answer»

`{:(CH_(2)-OH),(|),(CH-OH),(|),(CH_(2)-OH):}`
`CH_(3)-underset(CH_(3))underset(|)underset(CH_(2))underset(|)overset(CH_(2))overset(|)(CH_(2))-CH_(2)OH`
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OH`
`CH_(3)-CH_(2)-OH`

ANSWER :C
Discussion
23.

Write the structure and IUPAC name of the following compounds?(i) Malonic acid (ii) Succinic acid (iii) Glutaric acid (iv) Adipic acid

Answer»

SOLUTION :
Discussion
24.

Which of the following elements does not form oxy acids?

Answer»

P
N
Cl
F.

Answer :D
Discussion
25.

Which of the following reactions represent major products ?

Answer»




SOLUTION :a,b,c CORRECT

`OVERSET(Br_(2))underset(NAOH)to` no reaction
Discussion
26.

Whichof the followingare correctfor reaction (##AKS_TRG_AO_CHE_XII_V02_B_C03_E02_120_Q01.png" width="80%">

Answer»




SOLUTION :
Discussion
27.

Which of the following element involves th gradual filling of 5f level ?

Answer»

PM
Cm
Sm
Tm

Answer :B
Discussion
28.

Which one of the following statements about zeolite is true

Answer»

They are used as cation exchangers 
They have structure which enables then to take up SMALL MOLECULES 
Zeolites are ALUMINOSILICATES having THREE dimensional NETWORK 
Some of the `SiO_4^(4-)` units are replaced by `AlO_4^(5-) and AlO_6^(9-)` ions in zeolites 

Solution :Zeolites are cation exchangers & Alumino silicates having three dimensional network
Discussion
29.

Why are some medicines more effective in the colloidal form ?

Answer»

Solution :MEDICINES are more effective in the COLLOIDAL FORM because they have a large SURFACE area and are EASILY assimilated in this form.
Discussion
30.

Which of the following is an analgesic drug ?

Answer»

ASPIRIN
Ranitidine
Erythromycin
Luminal

Solution :Aspirin
Discussion
31.

The roasting of Hg in air produces :

Answer»

HGO
HG
`Hg(NO_(3))_(2)`
`HgSO_(3)`

Answer :B
Discussion
32.

Which of the following statements are not correctlyassociated with S_N1 reaction? I. Rearrangement is possible. II. Rate is affected by solvent polarity. III. The strength of the nucleophile is important inrate determining step. IV. The reactivity order is : tertiary gtsecondarygt primary V. Proceeds with complete inversion of configuration.

Answer»

III, V only
II,III , V only
IV and V only
III only

ANSWER :A
Discussion
33.

Write the monomers which are used for the synthesis of following polymer : Bakelite Indicate the type of polymerisation for each which forms polymer.

Answer»

SOLUTION :`{:("Monomers","TYPE of polymerisation"),("PHENOL + FORMALDEHYDE","Condensation"):}`
Discussion
34.

The unit of rate constant for the reaction obeying rate expression, r=K[A]^1[B]^(2//3) IS:

Answer»

`MOL^(-2//3)LITRE^(2//3)time^-1`
`Mol^(2//3)litre^(-2//3)time^-1`
`Mol^(-5//3)litre^(-2//3)time^-1`
NONE of these

Answer :A
Discussion
35.

Which is not an ore of nickel?

Answer»

Pentlandite
Garnierite
Haematite
Nickel glance

Answer :C
Discussion
36.

Which among the following square planar complex will exhibet geometrical isomerism?

Answer»

` [Ma_2B_2]^(NT) `
` [MA_2BC) ^(nt)`
` [M(XY)]^(nt)`
all the above

ANSWER :D
Discussion
37.

Which of the following bases is not present in DNA ?

Answer»

ADENINE
THYMINE
CYTOSINE
URACIL

ANSWER :D
Discussion
38.

The stuctural formula of an amino acid isoleucine is____________.

Answer»
Discussion
39.

Which of the following is a 3^(@) amine?

Answer»

1-methylcyclohexylamine
Triethylamine
tert-butylamine
N-methylaniline

Solution :
Discussion
40.

What is the order of photochemical reactions?

Answer»

SOLUTION :PHOTOCHEMICAL REACTIONS are generally of ZERO ORDER.
Discussion
41.

What is the rate determining step in Cannizzaro's reaction?

Answer»

Solution :`H- overset(overset(O)(||))(C )-H+ OH^(-) rarr H-UNDERSET(underset(H)(|))overset(overset(O)(|))(C )-OH`

and `H-overset(overset(O)(||))(C )- OH + CH_(3)O^(-) rarr HCOO^(-) + CH_(2)OH`
Transfer of hydride ion on to the carbonyl carbon is the RATE determining step in the Cannizzaro.s reaction
Discussion
42.

Which one of the equation is currect ?

Answer»

`delta G=delta G^0+ nRT LOG Q`
`delta G=delta G+ nRT log Q`
`delta G = delta G^0+ nRT In Q`
`delta G = delta G+ nRT In Q`

ANSWER :C
Discussion
43.

Which of the following isnot characteristic of alcohols

Answer»

they are lighter than water
Their BOILING points RISE fairly uniformly with increasingmolecular weight
Lower members are insoluble in water and organic solvents but solubility regularly increasing with MOLECULAR weight
Lower members have pleasant smell and burning TASTE, while higher members are odourless and tasteless.

Solution :Lower members are soluble in water and solubilty decreases with increasing molecular MASS because hydrophobic character increases.
Discussion
44.

Which of following compounds will give 1^(@) alkyl halide and 3^(@) alkyl halide on monohalogation?

Answer»

pentane
2-methyl propane
2,3 DIMETHYL butane
n-butane

Solution :2,3-dmethyl butane `CH_(3)-overset(CH_(3)) overset(|)(CH)-overset(CH_(3)) overset(|)(CH)-CH_(3)`
It has `1^(@) H and 3^(@)H` on halogenation, gives, `1^(@)R-X and 3^(@)R-X`
Discussion
45.

What happens when methyl chloride is treated with KCN ?

Answer»

Solution :The reactions are explained as under :
`underset("Methyl chloride") (CH_(3) - Cl + KCN) overset(ETOH - H_(2) O , Delta ) to underset (Methyl cyanide") (CH_(3) - C -= N ) + KCL `
Discussion
46.

Write the equations for the reactions involved in the leaching of alumina from bauxite ore.

Answer»

Solution :`Al_(2)O_(3)(S) + 2NaOH(aq) + 3H_(2)O rarr 2NA[Al(OH)_(4)](aq)`
`2Na[Al(OH)_(4)](aq) + 2CO_(2)(g) rarr Al_(2)O_(3).xH_(2)O(S) + 2NaHCO_(3)(aq)`
`Al_(2)O_(3)x.H_(2)O(S) rarr Al_(2)O_(3)(S) + xH_(2)O(g)`
Discussion
47.

Ultra violet rays are not allowed to pass through :

Answer»

FLINT glass
Crown glass
Crookes glass
Safety glass

Answer :C
Discussion
48.

Which of the following compounds gives fastest reaction with HBr and why? (i) (CH_(3))_(3)(ii) CH_(3) CH_(2) CH_(2) OH (iii) CH_(3) overset(OH)overset(|)(CH) CH_(3)(iv) CH_(3) overset(CH_(3))overset(|)(CH) CH_(2) OH

Answer»

SOLUTION :(i) `(CH_(3))_(3) C - OH`
DUE to formation of EDG and formation of cation
Discussion
49.

When the E_(a) of a reaction zero then the rate constant of the reaction is equal to ___________

Answer»

`2.303 K`
`(K)/(2.303)`
`(t_((1)/(2)))`
`A`

ANSWER :D
Discussion
50.

Which of the follwing is narrwo spectium bactericidal antibiotic?

Answer»

Erythnomycin
Oflaxacin
penicillin
Chloramphenicol

Answer :C
Discussion