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.

Photochemical smog occursis warm dry and sunnyclimate.Oneof thefollowingis notamongstthe components of photochemicalsmogidentifyit.

Answer»

`NO_(2)`
`O_(3)`
`SO_(2)`
UNSATURATED hydrocarbon

Answer :C
2.

Photochemical smog is related to the pollution of

Answer»

Noise
Water
Soil
Air

Answer :D
3.

Photochemical smog occors at temperature.

Answer»
4.

Photochemical smog is formed in :

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SUMMER during MORNING time
Summer during DAY time
Winter during morning time
Winter during day time

Answer :B
5.

Photochemical smog is caused by :

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CO
`CO_2`
`NO_2`
`O_3`

ANSWER :C
6.

Photochemical smog is a mixture of oxidising pollutants.

Answer»


ANSWER :A
7.

Photochemical smog consists of excessive ammmt of X, in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth, X is:

Answer»

`CO`
`CH_(4)`
`O_(3)`
`CO_(2)`

SOLUTION :Chemical POLLUTANTS in photochemical SMOG are nitrogen oxides `(NO and NO_(2))`, VOLATILE organic compounds, ozone `(O_(3))` and peroxyacetyl nitrate.
8.

Photochemical smog formed in congested metropolitan cities mainly consists of

Answer»

HYDROCARBONS, `SO_2` and `CO_2`
Smoke , PEROXYACETYL nitrate and `SO_2`
Ozone , peroxyacetyl nitrate and `NO_x`
Hydrocarbons , ozone and `SO_x`

ANSWER :B
9.

Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth X is:

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`CH_(4)`
`CO`
`CO_(2)`
`O_(3)`

Answer :D
10.

Photochemical bromination of n-butane produces

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1-BROMOBUTANE as the major product
2-bromobutane as the major product
both 1-bromobutane and 2-bromobutane with equal percentage
both 1-bromobutane and 2-bromobutane whose PERCENTAGES DEPEND upon temperature.

Solution :Photochemical bromination of n-butane will produce 2- bromobutane and 1-bromobutane . Their RELATIVE reactivity of `1^@ , 2^@` and `3^@` hydrogen to bromination is `1 : 82 : 1600`.
Thus 2-bromobutane is the major product
11.

Photochemical chlorination of alkanes is initiated by a process of

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Pyrolysis
Substitution
Homolysis
Peroxidation

Answer :C
12.

Photochemical oxidant are _______ oxidants.

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ANSWER :A::C::D
13.

Photochemical chlorination of alkane is initiated by a process of:

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Pyrolysis
Substitution
Homolysis
Peroxidation

Answer :B
14.

Phosphorus pentachloride dissociates as follows, ina closed reaction vessel, PC1_(5(g))hArrPC1_(3(g)) + C1_(2(g)) If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PC1_(5) is x, the partial pressure of PC1_(3) will be:

Answer»

`((x)/(x-1))P`
`((2x)/(1-x))P`
`((x)/(x-1))P`
`((x)/(1-x))P`

Solution :`{:(PCl_(5(G))hArrPCl_(3(g))+Cl_(2(g))),(1""0""0),((1-x)""x ""x):}`
`therefore"Partial pressure of" PCl_(3)=((x)/(x+1))P`
15.

Phosphate ester of X is called a nucleotide. X is

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adenine
guanine 
NUCLEOSIDE 
THYMINE 

ANSWER :C
16.

Phospodiester linkages are present between

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`C-3,` of ONE NUCLEOTIDE and C-5, of NEXT nucleotide
C-5' of one nucleotide and C-4' of next nucleotide
C-1' of one nucleotide and C-5' of next nucleotide
`C-1' ` of one nucleotide and C-5 of next nucleotide

ANSWER :A
17.

Phosphorus when dissolved in alkali, the products formed are

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<P>`PH_(3)+NaH_(2)PO_(2)`
 `PH_(3)+Na_(3)PO_(3)`
 `P_(2)H_(4) +NaH_(2)PO_(2)`
(D) Both (A) and (C)

Answer :A
18.

Phosphorylation of glucose is increased by

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AUXINS
INSULIN
ETHYLENE
Traumatic acid

Answer :B
19.

Natuaral reservoir of phosphorus is :

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<P>P MOLECULE
`P_2` molecule
`P_3` molecule
`P_4` molecule

Answer :D
20.

Phosphorus when exposed to air burns spontaneously because:

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The REACTION is endothermic
The reaction is EXOTHERMIC
The ACTIVATION energy is very low
Air contains some CATALYTIC agent

Answer :C
21.

Phosphorus pentoxide reacts with nitric acid to form.

Answer»

SOLUTION :`N_2O_5`
22.

Phosphorus pentoxide is :

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OXIDISING AGENT
REDUCING agent
BLEACHING agent
DEHYDRATING agent

Answer :A
23.

Phosphorus pentachloride reacts with sulfur dioxide to form

Answer»

Chlorosulfonic ACID
PHOSPHORIC acid
Thionyl CHLORIDE
Sulfuryl chloride

SOLUTION :Thionyl chloride
24.

Phosphorus pentoxide cannot be used to dry:

Answer»

Nitrogen
Ammonia
Hydrogen sulphide
Sulphur dioxide

Answer :B
25.

Phosphorus pentachloride reacts with acetone to give POCl_(3) and :

Answer»

`CH_(3)-CHCl-CH_(3)`
`CH_(2)CL-CO-CH_(2)Cl`
`CH_(3)-C Cl_(2)-CH_(3)`
`CH_(2)Cl-CHCl-CH_(2)Cl`

SOLUTION :`CH_(3)COCH_(3)+PCl_(5)rarrCH_(3)-UNDERSET(Cl)underset(|)OVERSET(Cl)overset(|)(C)-CH_(3)+POCl_(3)`
26.

Phosphorus pentachloride dissociates as follows in a closed vesselmPCl_(5)(g)hArr PCl_(3)(g)+Cl_(2)(g).If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl_(5) is x, the partial pressure of PCl_(3) will be :

Answer»

`((2x)/(1-X))P`
`((x)/(x-1))P`
`((x)/(1-x))P`
`((x)/(1+x))P`

SOLUTION :`{:(,PCl_(5),hArr,PCl_(3),+,Cl_(2)),("At equilibrium",1-x,,x,,x):}`
Total moles `=1-x+x+x=1+x`
PARTIAL pressure of `PCl_(3)=((x)/(1+x))P`.
27.

Phosphorus occurs in nature in the form of stable phosphates. (Animal bones also contain calcuim phosphate (58%)).The important minerals are: (i)Phosphorite, Ca_3(PO_4)_2(ii)Chloraptite,Ca_3(PO_4)_2CaCl_2 (iii)Fluoraptite, Ca_3(PO_4)_2CaF_2 There are some depoists of nitrates and phosphates in earth's crust.Nitrates are more soluble in water Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily.Compounds of phosphorus and nitrogen are used as fertilizer. Amongs the following select the correct statement :

Answer»

Regular use of Superphosphate of lime fertilizers increases the acidity of soil
`Ca_3(PO_4)_2CaF_2+H_3PO_4 to Ca(H_2PO_4)_2+2HF`
Here instead of `H_2SO_4, H_3PO_4` is used to avoid the formation of solution `CaSO_4`
between nitrates and phosphates, nitrates are more abundant in earth crust
Polyphosphates are used as water SOFTENING agents because they form soluble complexes with CATIONIC SPECIES

Solution :`H_3PO_4` is used to avoid the formation of the insoluble `CaSO_4`(WASTE product)
Polyphosphate SEPARATE `Ca^(2+)` and `Mg^(2+)` (present in hard water ) and forms soluble complex with `Ca^(2+)` and `Mg^(2+)` which do not precipitate with `CO_3^(2-)` and soap.
28.

Phosphorus occurs in nature in the form of stable phosphates. (Animal bones also contain calcuim phosphate (58%)).The important minerals are: (i)Phosphorite, Ca_3(PO_4)_2(ii)Chloraptite,Ca_3(PO_4)_2CaCl_2 (iii)Fluoraptite, Ca_3(PO_4)_2CaF_2 There are some depoists of nitrates and phosphates in earth's crust.Nitrates are more soluble in water Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily.Compounds of phosphorus and nitrogen are used as fertilizer. Ca_3(PO_4)_2CaF_2+H_2SO_4to(X)+HF X is -

Answer»

Triple SUPER PHOSPHATE
Super phosphate
Phosphorite
Vivianite

Solution :`3(Ca_3(PO_4)_2CaF_2)+7H_2SO_4toubrace(3Ca(H_2PO_4)_2+7CaSO_4)_("Super phosphate") +2HF`
`H_3PO_4` is USED to avoid the FORMATION of the insoluble `CaSO_4` (waste PRODUCT).
29.

Phosphorus occurs in nature in the form of stable phosphates. (Animal bones also contain calcuim phosphate (58%)).The important minerals are: (i)Phosphorite, Ca_3(PO_4)_2(ii)Chloraptite,Ca_3(PO_4)_2CaCl_2 (iii)Fluoraptite, Ca_3(PO_4)_2CaF_2 There are some depoists of nitrates and phosphates in earth's crust.Nitrates are more soluble in water Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily.Compounds of phosphorus and nitrogen are used as fertilizer. Amongs the following which is not member of apatite family ?

Answer»

`Ca_9(PO_4)_6. CaCl_2`
`Ca_9(PO_4)_6.CaF_2`
`Ca_3(PO_4)_2.Ca(OH)_2`
NONE of these

Solution :NA
30.

Phosphorus occus in free state.

Answer»

Solution :PHOSPHORUS DOCS not CCUR in the FREE state.
31.

Phosphorus is kept in :

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COLD water
alcohol
kerosene
ammonia.

Answer :A
32.

Phosphorus is manufactured by heating____in a furnace.

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Bone-ash, SODIUM CHLORIDE and COKE
Bone-ash, SILICA and coke
Bone-ash, silica and lime
Bone-ash, coke and limestone

Answer :B
33.

Phosphorus has three allotropic forms : (i) white phosphorus (ii) red phosphorus and (iii) black phosphorus. Write the difference between white and red phosphorus on the

Answer»

SOLUTION :
34.

Phosphorus in +1 oxidation state is found in:

Answer»

`H_3PO_3`
`H_3PO_4`
`H_3PO_2`
`H_4P_2O_7`

ANSWER :C
35.

Phosphorus has the oxidation state of + 3 in

Answer»

orthophosphoric acid
hypophosphoric acid
metaphosphoric acid
orthophosphorus acid

Answer :D
36.

Phosphorus forms five bonds due to sp^(3)d hydridisation but nitrogen does not form pentahalides due to :

Answer»

small SIZE of N atom
high IONISATION energy of N
absence of d - orbitals in valence shell
its TENDENCY to form multiple bonds.

Answer :C
37.

Phosphorus forms a number of oxoacids. Out of these oxoacids, phosphinic acid has strong reducing property. Write its structure and also write a reaction showing its reducing behaviour.

Answer»

SOLUTION :The structure of phosphinic acid (hypophosphorus acid) is given on the R.H.S. Since it contains two P-H bonds, it acts as a strong reducing agent. For EXAMPLE, it reduces `AgNO_(3)` to metallic SILVER.
`4 AgNO_(3) + H_(3)PO_(2) + 2H_(2)O rarr 4 Ag darr + H_(3)PO_(4) + 4 HNO_(3)`
38.

Phosphorus forms a number of oxoacids. Out of these oxoacids phosphinic acid has strong reducing property. Write its structure and also write a reaction showing its reducing behaviour.

Answer»

Solution :
Phosphinic ACID acts as a good reducing agent because of presence of TWO P-H bonds.
`4AgNO_(3) + 2H_(2)O + H_(3)PO_(2) to 4Ag + 4HNO_(3) + H_(3)PO_(4)`
39.

Phosphorus compound used as drying agent and desicating agent is:

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`PCl_3`
`PCl_5`
`P_4O_10`
`P_4O_6`

ANSWER :C
40.

Phosphorus can expand its valency. Why?

Answer»

Solution :In its VALENCY SHELL, phosphorus has vacant d-orbitals, which can be used for bonding. Hence, phosphorus can expand its valency upto 6, as in `PF_(6)^(-)`.
41.

Phosphorus and chlorine form two compounds. The first contains 22.54% by mass of phosphorus and the second 14.88% of phosphorus. Show that these data are consistent with law of multiple proportions.

Answer»

Solution :The ratio of the masses of chlrorine which combines with a fixed mass of PHOSPHORUS in two COMPOUNDS is 3:5 which is simple whole NUMBER ratio. Thus, the data illustrate law multiple proportions.
42.

Phosphorous acid on heating gives the following products: 4H_(3)PO_(3)overset(Delta)rarr3H_(3)PO_(4)+PH_(3) The above reaction is an example of

Answer»

OXIDATION
THERMAL DECOMPOSITION
DISPROPORTIONATION
reduction

Answer :C
43.

Phosphorous is usually extracted from

Answer»

Phosphorite
Apatite
Chlorapatite
Triphylite

Answer :A
44.

Phosphorium bromide is obtained by reacting phosphine with

Answer»

HBR<BR>`Br_(2)`
`NAOBR`
`PBr_3`

ANSWER :A
45.

Phosphorous acid is

Answer»

MONOBASIC acid
dibasic acid
tribasic acid
tetrabasic acid

Answer :B
46.

Phosphoric acid on reaction with sufficient quantity of NaOH gives:

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`Na_3PO_4`
`Na_2HPO_4`
`NaH_2PO_4`
`NaHPO_3`

ANSWER :A
47.

Phosphoric acid is the most important of the phosphorus oxyacids. Industrially, phosphoric acid is prepared by

Answer»

the Ostwald process
the HABER's process
the REACTION of PHOSPHATE ROCK with SULPHURIC acid
the reaction of `P_4O_10` with water

Answer :C
48.

Phosphoric acid is syrupy liquid due to

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Strong COVALENT bond
van der WAALS forces
Hydrogen bonding
None of these

Answer :C
49.

Phosphoric acid is prepared by

Answer»

HYDROLYSIS of `P_2O_3`
hydrolysis of `P_4O_10`
hydrolysis of `PCI_3`
ACTION of `PCl_(3)` on `H_3PO_3`

ANSWER :B
50.

Phosphoric acid ionises as :H_(3)PO_(4)overset(K_(1))hArr H^(+)+H_(2)PO_(4)^(-)H_(2)PO_(4)^(-)overset(K_(2))hArr H^(+)+H_PO_(2)^(-)H_(2)PO_(4)^(2-)overset(K_(3))hArr H^(+)+PO_(3)^(-)The equilibrium constant, K for the reaction :H_(3)PO_(4)hArr 3H^(+)+PO_(4)^(3-) is :

Answer»

`K_(1)//K_(2) K_(3)`
`K_(1)+K_(2)+K_(3)`
`K_(3)//K_(1) K_(2)`
`K_(1)K_(2)K_(3)`

ANSWER :D