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.

Van der Waal's radius is used for

Answer»

Molecular SUBSTANCES in gaseous STATE only
Molecular substances in SOLID state only
Molecular substances in LIQUID state only
Molecular substances in any state

Answer :B
Discussion
2.

What happens when H_(3) PO_(3) is heated ?

Answer»

Solution :The oxidation state of P in `H_(3)PO_(3)" is "+3`. Since this VALUE is intermediate between the highest (+5) and lowest(-3) oxidation states of P, therefore, when `H_(3)PO_(3)` is HEATED it undergoes DISPROPORTIONATION to form `PH_(3)andH_(3)PO_(4)` with oxidation states of -3 and +5 respectively.
`UNDERSET("Orthophosphorous acid")overset(+3)(4H_(3)PO_(3))overset("Heat")tounderset("Phosphine")overset(-3)(PH_(3))+underset("Orthophosphoric acid")overset(+5)(H_(3)PO_(4))`
Discussion
3.

The slowest step in the mechanism determines .............

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SOLUTION :RATE of REACTION
Discussion
4.

Which of the following has maximum number of lone pairs associated with Xe?

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`XeF_(2)`
`XeO_(3)`
`XeF_(4)`
`XeF_(6)`

Solution :`XeF_(2)`
Discussion
5.

Write the atomic number of the element present in the third and seventeenth group of the periodic table.

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Solution :Since it belongs to 3RD period, it will have outermost shell , n = 3.
It.s configuration will be `3s^(2)3p^(5)`.
`:.{:(He,Ne,Ar),(2,10,18):}`
` :. ` atomic number `(Z = 10 + 2 + 5) = 17`
` :. ` element Cl (Chlorine)
Discussion
6.

What is screening effect? How is it related to IE?

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Answer : Reduction of NUCLEAR attraction on the VALENCE electrons. IE is INVERSELY PROPORTIONAL to screening effect.
Discussion
7.

Which of the following does not alter the equilibrium ?

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CATALYST
CONCENTRATION
TEMPERATURE
PRESSURE

SOLUTION :catalyst
Discussion
8.

What is Aromatisation? Give example.

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Solution :Hexane or higher akanes when heated in presence of vanadium pentoxide `(V_(2)O_(5))`, molybdernium oxide `(MO_(2)O_(3))` or chromium oxide `(Cr_(2) O_(3))` supported on ALUMINA `(Al_(2) O_(3))` at 800 K and 10-20 atm pressure GIVE benzene or its alkyl DERIVATIVES with the liberation of hydrogen. this dehydrogenation process which involves cyclisation of alkanes is known as AROMATIZATION.
Discussion
9.

Xoverset(CoCl_(2))rarrCaCl_(2)+Yuarr, the effective ingredient of X is :

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`OCL^(-)`
`CL^(-)`
`OCl^(+)`
`OCl_(2)^(-)`

SOLUTION :N//A
Discussion
10.

What mass of an oxygen gas will occupy 8.21 L of volume at 1 atm pressureand 200 K temperature ?

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16g
8 G
20 g
12 g

ANSWER :a
Discussion
11.

The standard value of enthalpy of combustion of benzoic acid is ____

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SOLUTION :`-3237 "KJ MOL"^(-1)`
Discussion
12.

Whichone of the following has garlic odour

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ethane
THENE
ethyne
ETHANOL

ANSWER :C
Discussion
13.

What is difference between STP or NTP and SATP ?

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Solution :STP, 1 ATM `= 1.0132xx10^(5)` Pa
SATP, 1 bar `= 1XX10^(5)` Pa
TEMPERATURE is same at 273.15 K or `0^(@)C`.
Discussion
14.

What are isotopes? Write the names of isotopes of hydrogen.

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Solution : (i) Isotopes are atoms of the same element that have the same ATOMIC NUMBER but having DIFFERENT mass numbers (or) Isotopes are atoms with the same number of protons and electrons but differ in number of neutrons.
(ii) Hydrogen has THREE naturally occurring isotopes namely PROTIUM `("_(1)H^(1))`, Deuterium`("_(1)H^(2))`,and Tritium `("_(1)H^(3))`
Discussion
15.

The sulphur dioxide obtained by the combustion of 8 gms of sulphur is passed into Bromine water. The solution is then treated with barium chloride solution. The amount of barium sulphare formed is

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1 mole
0.5 mole
0.25 gms
0.25 GM moles

Solution :32 gm of sulphur is PRESENT in 1 mole of `BaSO_(4)`
8 gm of sulphur is present in `1//4` mole `BaSO_(4)`
Discussion
16.

The volume of water to be added to 400 mL of N//8 HCl to make it exactly N//12, is :

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400 mL
300 mL
200 mL
100 mL

Solution :N//A
Discussion
17.

What happens when quick lime is heated with silica ?

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Solution :`CaO + SiO_2(s) overset(DELTA) to UNDERSET("CAL. Silicate")(CaSiO_3(s))`
Discussion
18.

What is the nature of CH_(3)COOH in conc. HCl solution ?

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ANSWER : BRONSTED BASE
Discussion
19.

Which silicon compound is used as lubricant

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ASBESTOS
SILICONE
Zeolite
Mica

Solution :Silicone is USED as libricant
Discussion
20.

What is the relationship between pHand pOH ?

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Solution :`PH + POH = pK_(W) = 14`.
Discussion
21.

The value of K_c = 4.24 at 800K for the reaction, CO_((g)) + H_2O_((g)) hArrCO_(2(g)) + H_(2(g))Calculate equilibrium concentrations of CO_(2), H_2, CO and H_2O at 800 K, if only CO and H_2O are present initially at concentrations of 0.10M each.

Answer»

Solution :`{:("REACTION :", CO_((g))+, H_2O_((g)) hArr , CO_(2(g)) + , H_(2(g))),("INITIAL conc. :",0.1 M,0.1 M, 0 M, 0 M),("Reaction change :",-xM,-X M,+x M,+x M),("Concentration of equilibrium:",(0.1-x)M,(0.1-x)M,x M, x M):}`
where , x= amount of CO consume in reaction = amount of `H_2O`
x=made of product = amount of `CO_2` = amount `H_2`
`K_c=([CO_2][H_2])/([CO][H_2O])=((x)(x))/((0.1-x)(0.1-x))=x^2/(0.1 -x)^2`
`therefore x^2/(0.1-x)^2=4.24`
`therefore x^2=4.24(0.01-0.2x - x^2)`
`therefore x^2=0.0424-0.848x+4.24x^2`
`therefore underseta(3.24x^2)-undersetb(0.848x)+undersetc(0.0424)=0`
This is quadratic equation in which , a=3.24 , b=-0.848 and c=0.0424
This equation of quadratic , `ax^2+bx+c`
`therefore x=(-bpmsqrt(b^2-4ac))/(2a)`
`therefore x=(-(-0.848)pmsqrt((0.848)^2-4(3.24)(0.0424)))/(2(3.24))`
`therefore x=(+0.848 pm SQRT(0.7191-0.5495))/6.48`
`=(0.848pmsqrt(0.1696))/6.48 =(0.848 pm 0.4118)/6.48`
`=1.2598/6.48`
`0.4362/6.48`
=0.1944 OR 0.0673
The value 0.1994 should be neglected because it will give concentration of the reactant which is more than initial conc.
So, x=0.0673 M
`therefore` Product of equilibrium `[CO_2]=[H_2]`=0.0673 M
Reaction of equili. [CO]=`[H_2O]`= (0.1-x)M
=(0.1-0.0673)M = 0.0327 M
Discussion
22.

Which of the following compound is insoluble in water?

Answer»

`KNO_(2)`
`AgNO_(3)`
`BA(NO_(2))_(2)`
`NaNO_(2)`

Answer :B
Discussion
23.

Which of the following pair of species can be separated by dil. HCI?

Answer»

`Hg(NO_(3))_(2)` and `Hg_(2)(NO_(3))_(2)`
`AgNO_(3)` and `Hg(NO_(3))_(2)`
`FE(OH)_(3)` and `AI(OH)_(3)`
`HgS` and `MnS`

ANSWER :A::B::D
Discussion
24.

What happens when ethylene is passed through cold dilute alkaline potassium permanganate.

Answer»


Answer :ETHENE reacts with COLD alk KM`no_(4) (Balyer's REGENT to give ethane1 , 2 - diol
`(##SUR_CHE_XI_VO2_S_MQP_02_E01_051_A01##)`
Discussion
25.

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

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`CH_(2)=CH-C L`
`C_(6)H_(5)Cl`
`CH_(3)CH=CHCl`
`ClCH_(2)-CH=CH_(2)`

SOLUTION :rate of `S_(N^(2) ) PROP `L.G tendency `prop (1_/("partial D.B.characters in C-Xbond")`
Discussion
26.

What is water gas ? How is it prepared ?

Answer»

Solution :An EQUIMOLAR mixture of CO and `H_(2)` is CALLED water GAS. It is prepared by passing steam over red hot coke.
`C(s) + H_(2)O(g) overset(1273 K) to CO(g) + H_(2)(g)`
Discussion
27.

When pressure is expressed in dynes and volume in cm^3the value of R is ………… .

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SOLUTION :`8.314xx10^7 " ERGS " K^(-1) MOL^(_1)`
Discussion
28.

Which of the following series contains only electrophiles

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`H_(2)O, SO_(3), H_(3)O^(+)`
`NH_(3), H_(2)O, AlCl_(3)`
`AlCl_(3), SO_(3), NO_(2)^(+)`
`H_(2)O, CL^(+), NH_(3)`

Answer :C
Discussion
29.

The second electron affinity of oxygen is +744 kJ*mol^(-1) then the second electron affinity of sulphur is-

Answer»

`-200KJ*mol^(-1)`
`+450kJ*mol^(-1)`
`+800KJ*mol^(-1)`
`1200kJ*mol^(-1)`

ANSWER :B
Discussion
30.

Which of the following ions wilt cause hardness in water sample ?

Answer»

`Ca^(+2)`
`Na^(+)`
`Cl^-`
`K^+`

Solution :Bicarbonates, CHLORIDES and SULPHATES of Ca and Mg are RESPONSIBLE for the hardness of WATER.
Discussion
31.

Which of the following compound does not show geometrical isomerism?

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SOLUTION :(B) ALLEN will not show geometrical ISOMERISM.

`therefore` It cannot show geometrical isomerism
Discussion
32.

Which of the following can work as a dehydrating agent for alcohols ?

Answer»

`H_(2)SO_(4)`
`Al_(2)O_(3)`
`P_(2)O_(5)`
All

Solution :These question are BASED upon facts or FORMULAE
Discussion
33.

Which of the following compoundsare readily soluble in water ?

Answer»

`BeSO_(4)`
`MgSO_(4)`
`BaSO_(4)`
`SrSO_(4)`

SOLUTION :Solubility decreases down the GROUP as hydration enthalpy decreases but LATTICE enthalpies remain ALMOST costant . Thus , `BeSO_(4)` and `MgSO_(4)` are soluble in water .
Discussion
34.

What atoms are indicated by the following configurations ? (i) [He] 2s^(1)(ii) [Ne] 3s^(2) 3p^(3)(iii) [Ar] 4r^(2) 3d^(1)

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SOLUTION :(a) `._(3)Li` (B) `._(15)P` (C) `._(21)SC`
Discussion
35.

When a sample of baking is strongly ignited in a crucible, it suffered a loss in weight of 3.1 g. The mass of baking soda is

Answer»

`16.8g`
`8.4g`
`11.6g`
`4.2g`

Solution :`underset(2xx84g)underset("BAKING SODA")(2NaHCO_(3))OVERSET(Delta)rarrNa_(2)CO_(3)+underset(62g)underset("Loss of WEIGHT")ubrace(H_(2)O+CO_(2))`
Discussion
36.

(x) C_(7)H_(12) overset(O_(3))underset(Me_(2)S)toP+Q Compound P responds to Tollen's test and iodoform test but Q does not respond with both the reagents. Structure of compound (x) is :

Answer»




SOLUTION :
Discussion
37.

What is the wavelength (in m) of a particle of mass 6.62 xx 10^(-29)g moving with a velocity of 10^(3)m.s^(-1) ? (h = 6.62 xx 10^(-34) J.s)

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`6.62 xx 10^(-4)`
`6.62 xx 10^(-3)`
`10^(-5)`
`10^(5)`

Answer :C
Discussion
38.

Which of the following reactions will give alkyne?

Answer»




`H_3C - C -= CH OVERSET(Hg^(+2), H_2SO_4)to `

SOLUTION :`H_3- C -= CH overset(Hg^(+2), H_2SO_4)to` is ALKYNE not formed.
Discussion
39.

The velocity of a gas molecule present in a cubic vessel in a particular direction is 100 cm/sec. The side of that cubic vessel is 10 cm. The time taken for one collision in a given particular direction on one face is

Answer»

0.2 SEC 
5 sec 
0.5 sec 
50 sec 

ANSWER :A
Discussion
40.

Which one of these gases has the highest critical temperature ? .

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`W`
`X`
`Y`
`Z`

SOLUTION :CRITICAL TEMPERATURE `T_(c) = (8a)/(27Rb)` .
Discussion
41.

Which of the following disproportionates when treated with water ?

Answer»

`SO_(3)`
`F_(2)`
`N_(2)`
`Cl_(2)`

Solution :`overset(0)(Cl_(2))+H_(2)O to overset(-1)(HCL) + overset(+1)(HOCL)`
Discussion
42.

The volume of a gas at 0°C and 700 mm pressure is 760 cc. The number of molecules present in this volume is:

Answer»

`1.88 XX 10^(22)`
`6.022 xx 10^(23)`
`18.8 xx 10^(23)`
`18.8 xx 10^(23)`

ANSWER :A
Discussion
43.

Which of the following statements is not correct regarding purification of liquids by steam distillation?

Answer»

impurities MUST be non-volatile
The liquid must be completely immiscible with water
The liquid must POSSESS high boiling point
The liquid must not be STEAM volatile

Answer :D
Discussion
44.

Water is a ....

Answer»

BASIC OXIDE
acidic oxide
AMPHOTERIC oxide
NONE of these

Solution :amphoteric oxide
Discussion
45.

Which is the IUPAC name of methyl propyl ether?

Answer»

Methoxypropane
Methyl propoxy
Propoxymethane
Methoxy ethane

Solution :Methoxypropane `(CH_(3)OCH_(2)CH_(2)CH_(3))`
Discussion
46.

Which of the following statement is wrong .

Answer»

Through SODIUM and potassium are similar chemically , they differ in their behaviour in biological system
Potassium ions are less abundant WITHIN the cell than sodium ions as their penetrating power is less
Potassium ions activate many enzymes
Sodium ions are responsible for the transmission of nerve SIGNALS

ANSWER :B
Discussion
47.

In the diagram shown in figure, all pulleys are smooth and massless and strings are light. Match the following (##AKS_TRG_AO_PHY_XI_V01_A_C05_E01_045_Q01.png" width="80%">

Answer»

`K_2 =(K_1+K_3) //2`
` K_1 lt K_3`
` K_1 gt K_2`
` K_2 gt K_3`

SOLUTION :` 2 lt 4 lt 5 rArr K_1 gt K_2 gt K_3`
acid STRENGTH ` ALPHA (1)/( pH)`
Discussion
48.

Which drug is used for treatment of AIDS ?

Answer»




ANSWER :AZT
Discussion
49.

Write Van der Waals equation for one mole of a gas and name any two terms in it.

Answer»


Answer :`(P+a)/(V^(2))(V-b)=Rt` ……………..1 Any TWO TERMS ………….`(1//2+1//2)`
Discussion
50.

Which of the one following is not a state function ?

Answer»

`DELTA H`
`Delta S`
`S `
W

ANSWER :B
Discussion