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.

What is the pH of a solution whose H^(+) ion concentration is 2xx10^(-5)g ions/litre ?

Answer»


ANSWER :4.699
Discussion
2.

Which element of the following possesses half filled valence shell with electron ?

Answer»

C
O
Ne
N

Solution :CARBON (Z - 6) has electron configuration `1s^(2) 2s^(2) 2p^(2)` The valence shell (n = 2) has 4 electrons b u t the valence shell (n = 2) can be o c c u p ie d by m axim um 8 electrons. This rep resen TS TH a t valence shell of carbon atom is h alf filled
Discussion
3.

Which of the following statement is(are) correct ?

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Fluorine has the highest electro negativity
Helium has the highest IONIZATION energy
Alkali metals are the strongest OXIDIZING agents
Carbon has the highest MELTING point among NON metals

Answer :A::B::D
Discussion
4.

Who discovered cement?

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SOLUTION :J. Aspidin
Discussion
5.

Which of the following statement is correct

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`X^(+)` ion is LARGER than `X^(-)`
`X^(-)` ion is larger than X
`X^(+)` and `X^(-)` IONS have same SIZE
`X^(+)` ion is larger than X

Answer :B
Discussion
6.

Write the products A & B for the following reaction. Cl-CH_(2)-CH_(2)-Cloverset(KOH)underset(-HCl)(to)Aoverset(KOH)underset(-HCl)(to)B

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Solution :`underset(((1,2,"dichloro ethane")))(CL-CH_(2)-CH_(2)-Cl)overset(al.KOH)underset(-HCl)(to)underset((A))underset(("chloro ethane"))(CH_(2))`
`=CH-Cloverset(al.KOH)underset(-HCl)(to)underset((B))underset("ETHYNE")(CH=CH)`
Discussion
7.

The solubility product by Lead sulphate, PbSO_4 is 1.3 xx 10^(-8) calculate its solubility in pure water. The molecular mass of PbSO_4 = 303 g "mol"^(-1)

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SOLUTION :`3.45xx10^(-2) G L^(-1)`
Discussion
8.

Which of the following is used to visualize live cells?

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Chlorine
Bleaching powder
Animal charcoal
Iodine

Answer :C
Discussion
9.

Which gas has high speed between H_(2) and O_(2) ? Why ?

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Solution :SPEED of `H_(2)` GAS increases than `O_(2)` because its MOLECULAR MASS increases.
Discussion
10.

Which one is a set of isolectronic species ?

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`N_(2), CO_(2), CN^(-)`
`N, H_(2)S, CO`
`N_(2), CO, CN^(-)`
`Ca, Mg, Cl`

Solution :`N_(2) = 7 + 7 = 14e^(-), CO_(2) = 6 + 2 xx 8 = 22 e^(-)`
`CN^(-) = 6 + 7 + 1 = 14 e^(-)`. Hence, (a) is not
`N = 7E^(-), H_(2)S = 2 + 16 = 18e^(-)`
`CO = 6 + 8 = 14 e^(-)`. Hence (B) is not
`N_(2) = 14 e^(-), CO =6 + 8 = 14e^(-), CN^(-) = 6 + 7 + 1`
`= 14e^(-)`. Hence , (c) is a SET isolectronic species
Discussion
11.

Which of the following is correct IUPAC names are correct for the compound?HOOC - CH_2 - CH_2 - oversetunderset(|)(COOH)(C )H - CH_2 - CH_2 - COOH

Answer»

Pentane-1,3,5-tricarboxylic ACID
4-carboxyheptane-1,7 dioicacid
Heptane-1,4,7-trioicacid
Octane-1,4,7-triolacid

ANSWER :A
Discussion
12.

Which of the following species is aromatic?

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Solution :All (a),(c),(d), satisfy Huckel `(4n+2)PI` electron RULE. (B) is anti-aromatic as it has `8PIE^(-) (4n)`
Discussion
13.

What does atomic radius and ionic radius really mean to you?

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Solution :Atomic radius :
Atomic radius is ONE HALF of the distance between the nuclei of two covalently bonded atoms of the same element in a molecule.
It CASE of metals, the atomic radius is called metallic radius. It corresponds to one half of the distance between two adjacent atoms in a crystal lattice.
Ionic Radius :
Ionic radius means the size of the ion, a cation or anion.
This GIVES the effective distance from the nucleus of the ions upto which it has an influence in the ionic bond.
The size of the cation is always smaller that of the parent atom while the size of the anion is always larger than that of the parent atom.
Discussion
14.

From the following data CH_(3)OH(l)+(3)/(2)O_(2)(g) rarr CO_(2)(g) +2H_(2)O(l) Delta_(r) H^(@)=-726 kJ mol^(-1) H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(l), Delta _(r) H^(@)=-286 kJ mol^(-1) C("graphite") +O_(2)(g) rarr CO_(2)(g), Delta _(r) H^(@)=-393 kJ mol^(-1) The standard enthalpy of formation of CH_(3)OH(l)" in "kJ mol^(-1) is

Answer»

`Z = X +y `
`x = y + z`
`y = 2 z - x `
`x = y - z `

ANSWER :B
Discussion
15.

The standard enthalpies of formation of C_2H_5OH_((l)), CO_(2(g)) and H_2O_((l)) are -277 , -393.5 and -285.5 "kJ mol"^(-1) respectively . Calculate the standard enthalpy change for the reaction C_2H_5OH_((l)) +3O_(2(g)) to 2CO_(2(g)) +3H_2O_((l)) The enthalpy of formation of O_(2(g)) in the standard state is zero , by definition.

Answer»

SOLUTION :The standard enthalpy change for the combustion of ethanol can be calculated from the standard enthalpies of formation of `C_2H_5OH_((L)), CO_(2(g))` and `H_2O_((l))` The enthalpies of formation are -277,-393.5 and -285.5 kJ `"MOL"^(-1)` respectively.
`C_3H_5OH_((l))+3O_(2(g)) to 2CO_(2(g)) +3H_2O_((l))`
`DeltaH_r^0=[(DeltaH_f^0)_"products"-(DeltaH_f^0)_"reactants"]`
`DeltaH_r^0=[2(DeltaH_f^0)_(CO_2)+3(DeltaH_f^0)_(H_2O)]-[1(DeltaH_f^0)_(C_2H_5OH)+3(DeltaH_f^0)_(O_2)]`
`DeltaH_r^0=["2 mol (-393.5) kJ mol"^(-1) + "3 mol (-285.5 ) kJ mol"^(-1)]-["1 mol (-277) kJ mol"^(-1) +"3 mol (0) kJ mol"^(-1)]`
=[-787-856.5]-[-277]
=-1643.5+277
`DeltaH_r^0` =-1366.5 KJ
Discussion
16.

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is

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`(4pi^(2) mr^(2))/(nh)`
`(nh)/(4pi^(2)mr)`
`(2pimr)/(N^(2) h^(2))`
`(h)/(2pi mr)`

Solution :By Bohr POSTULATE, `mv r = n (h)/(2pi) or v = (nh)/(2pi mr)`
No. of revolution per sec
`= ("Velocity")/("Circumference of the orbit")`
`= (v)/(2pi r) = (nh)/(2pi mr) xx (1)/(2pi r) = (nh)/(4pi^(2) mr^(2))`
`:.` TIME taken for one revolution `= (4pi^(2) mr^(2))/(nh)`
Discussion
17.

Which of the following is not use of CaO ?

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As BLEACHING powder
In PURIFICATION of sugar
To CONVERT hard water to SOFT water
As an antiseptic

Answer :D
Discussion
18.

Which one is not element ?

Answer»

DIAMOND
Graphite
Silica
Oxygen

Answer :A::C
Discussion
19.

Which of the following elements has the lowest melting point?

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NaCl
NaF
NaBr
Na

Solution :Iodiders have LOW M.P
Discussion
20.

Which statement is wrong ?

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The STABILITY of hydride of group 15 increases as MOVING from top to bottom
Nitrogen cannot FORM `dpi-dpi` bond
N-N bond is weaker then P-P bond
`N_2O_4` having TWO resonance structure

Answer :A
Discussion
21.

When Ag_(2)CO_(3) is heated then product will be:

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`Ag_(2)O`
`AG`
`O_(2)`
`CO_(2)`

ANSWER :B::C::D
Discussion
22.

What is the state of hybridisation of carbon in diamond.

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SOLUTION :Diamond :Each CARBON in diamond is `sp^3` hybridised and is BOUND to four other carbon atoms.
Discussion
23.

The subsidiary quantum number decides _________.

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the shape of the orbital
the ORIENTATION of the orbital
energ LEVEL of the orbital
the SPIN of the electron

ANSWER :A
Discussion
24.

Which of the following reaction involves the liberation of energy?

Answer»

`Na_(s) rarrNa_(g)^(+)`
`CI_(2(g)) RARR Na_((g))^(+) +CI_((g))^(-)`
`Na_((g))^(+)+CI_((g))^(-)rarrNaCI_((s))`
`NaCI_((s))rarrNa_((g))^(+)+CI_((g))^(-)`

ANSWER :C
Discussion
25.

What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm?

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SOLUTION :At 273.15 K 1 atm PRESSURE, every gas has MOLAR volume=22.4 L .
Discussion
26.

Which of the following is not a reducing agent ?

Answer»

`SO_(2)`
`H_(2)O_(2)`
`CO_(2)`
`NO_(2)`

ANSWER :C
Discussion
27.

Which of the following statements is not true regarding the cis and trans isomers of an alkene

Answer»

They are configurational isomers
They are diastereomers
The cis-isomer has HIGHER DIPOLE moment than the trans-isomer
The cis isomer USUALLY has a lower boiling POINT than the trans-isomer

SOLUTION :Cis - Alkene shows high boiling point than trans-alkene
Discussion
28.

Under what conditions of tenperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured.

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HIGH TEMPERATURE and high PRESSURE
LOW temperature and low pressure
High temperature and low pressure
Low temperature and high pressure

Solution :High temperature and low pressure
Discussion
29.

What is the maximum concentration of Mg^(+2)that can be introduced into a solution containing0.1 M NH_3 and 0.01 M NH_4^(+ )without causing precipitation of Mg (OH)_2 ?K_b of NH_3 = 10^(6)K_(sp)of Mg(OH)_2 =1.2 xx 10^(-12)

Answer»

` 0.012 M`
` 0.24 M`
` 0.024 M`
` 0.048 M`

Solution :no Mg ` OH)_2 ` PPT
`rArr IPlt KSP rArr [Mg^(+2) ] [OH^(-)] ^(2) LT 1.2 XX 10 ^(_12) `
` [OH^(-) ] =(K_bxx [NH_3])/([NH_4^(+) ])=(10 ^(-6)xx 0.1)/( 0.01)= 10 ^(-5) `
` rArr [Mg^(+2) ] lt(1.2xx 10 ^(-12))/( 10 ^(-10) )= 1.2 xx 10^(-2) `
Discussion
30.

You are given a mixture of acetone and methyl alcohol. How will you separate them ?

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ANSWER :By FRACTIONAL DISTILLATION
Discussion
31.

Which of the following is the structure of (S)-Pentan-2-ol is ?

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SOLUTION :the arrow is CLOCKWISE but least PRIORITY GROUP is on horizontal line of fischer projection.
Discussion
32.

Vapour pressure of a pure liquid A is 10.0torr at 27^(@)C. The vapour pressure is lowered to 9.0 torr on dissolving one gram of B in 20g of A. If the molar mass of A is 200 g mol^(-1) then calculate the molar mass of B.

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Solution :`P _(A)^(@) = 10` torr,` P_("solution") = 9` torr, `W_(A) = 20g, W_(B) =1G, M _(A) =200 g mol ^(-1), M _(B) =` ?
`(Delta P )/(P _(A) ^(@))= (W_(B) xx M _(A))/(M _(B) xx W _(A))`
` (10 -9)/(10) = (1XX 20 0)/( M _(B) xx 20)`
`M _(B) = (200)/(20) xx 10 =100 g mol ^(-1)`
Discussion
33.

Which of the following metal/metals can be used for the extraction of Ti from TiO_2

Answer»

NA
Al
MG
Zn

Solution :Na or Mg is USED for the EXTRACTION of TI from `TiO_2` .
Discussion
34.

Which elements of group 1 and 2 are differ from the other elements of same group ? Give brief on diagonal relationship.

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Solution :Lithium and beryllium, the FIRST ELEMENTS of Group 1 and Group 2 respectively exhibit some properties which are different from those of the other members of the RESPECTIVE group.
In these anomalous properties they resemble the second element of the following group. Thus, lithium shows similarities to magnesium and beryllium to aluminium in many of their properties.
This TYPE of diagonal similarity is commonly referred to as diagonal relationship in the periodic table. The diagonal relationship is due to the similarity in ionic sizes and /or charge/ radius ratio of the elements.
Monovalent sodium and potassium ions and divalent magnesium and calcium ions are found in large proportions in biological fluids.
These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction.
Discussion
35.

What happens when heavy water is added to calcium cardide ?

Answer»

SOLUTION :Deuteroacetylene is formed , `CaC_(2) + 2D_(2)O to Ca(OD)_(2) + DC -=CD`
Discussion
36.

Which of the following pair of element and ore is incorrect?

Answer»

K - Sylvine
Ba - Baryte
Mg - Cranite
Be - Oxide bromalite

Solution :`{:("Element",,"(Ore)"),((A)"K (POTTASSIUM)",:,"Sylvine"-KCl),((B)"Ba (BARIUM)",:,"Baryte":BaSO_(4)),((C )"Mg (MAGNESIUM)",:,),("Crinite",:,K_(2)SO_(4)","MgSO_(4)","MgCl_(2)),("Criserite",:,MgSO_(4)","H_(2)O),("Carnalite",:,MgCl_(2) KCl","6H_(2)O):}`
(D) Be (BERYLLIUM) :
Oxide bromalite : BEO (45% BeO)
Discussion
37.

Which of the following reaction is used to prepare hydrocarbon with even number of carbon ? (i) Wurtz reaction (ii) Decarboxylation reaction (iii) Kolbe's electrolysis (iv) Reduction (v) Hydrogenation

Answer»

Solution :(i) WURTZ reaction and (ii) Kolbe.s ELECTROLYSIS method is used to PREPARED hydrocarbon with EVEN number of carbon.
Discussion
38.

Which of the following compounds is not matched correctly with its structure?

Answer»



ANSWER :C
Discussion
39.

Which layer is present in upper region of stratosphere?

Answer»

`O_3`
CFC
`CO_2`
CO

Solution :`O_3`
Discussion
40.

Under ambient conditions the total number of gases released as other products in the first step of the reaction scheme shown below is:{:(KMnO_(4)overset("strongly")underset("heated")rarrP+"other product"),(""darr"disproportionation in" H^(+)//H_(2)O),("""Product(s)"):}

Answer»


ANSWER :1
Discussion
41.

The total number of acyclic structural isomers possible for compound with molecular formula C_(4)H_(10)O is

Answer»

9
7
5
6

Solution :Seven, out of which four are alcohols :
(i) `CH_(3)CH_(2)CH_(2)CH_(2)OH`, (II) `(CH_(3))_(2)CHCH_(2)OH`
(iii) `CH_(3)CH_(2)CHOHCH_(3)`, (iv) `(CH_(3))_(3)COH` and three are ethers :
(v) `CH_(3)CH_(2)OCH_(2)CH_(3)`,
(vi) `CH_(3)OCH_(2)CH_(2)CH_(3)`
and (VII) `CH_(3)OCH(CH_(3))_(2)`
Discussion
42.

Which of the following has maximum number of significant figures ? (i) 0.00453 (ii) 4.8046 (iii) 5.643

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SOLUTION :The NUMBER 4.8046 (II) has maximum numberof significant FIGURES i.e., Five.
Discussion
43.

Which metal can displace hydrogen from dilute acids from the following data. E_(zn//zn^(2+))=-076V.E_(Cu//Cu^(2+))=0.343V

Answer»


ANSWER :ZINC or ZN
Discussion
44.

what is the oxidation number of (i) C in CH_(2)O (i) Pt in [Pt (C_(2)H_(4))CI_(3)]^(-)

Answer»

SOLUTION :(i) x +2 (+1)+1(-2)=0 or x=0 (II) x+0 +3 (-1)=-1 or x=+2
please note that O.N of `C_(2)H_(4)` n(neutral ) is ZERO
Discussion
45.

Which of the following is a correct pair?

Answer»

`BeCl_2` LINEAR
`NH_3` linear
`CO_2`, TETRAHEDRAL
`BF_3,` OCTAHEDRAL

ANSWER :A
Discussion
46.

What mass of CaO will be required to remove the hardness of 1000 litres of water containing 1.62g of Ca(HCO_3)_2 per litre?

Answer»

Solution :`underset("162 g")(Ca(HCO_(3))_(2))+underset("56g")(CaO) to 2CaCO_(3)+H_(2)O+CO_(2)`
`5.6 xx 10^(2)g" be CAUSE solution has 1620 g"Ca(HCO_(3))_(2)`.
Discussion
47.

which of the following carbon is expected to be least stable.

Answer»




Solution :`-CH_(3)` group is benzene ACTIVATOR. It is ORTHO para DIRECTING.
Discussion
48.

Which one has highest melting point in given alkali chlorides ?

Answer»

RBCL
KCL
NACL
LICI

SOLUTION :NaCl
Discussion
49.

Which of the following compounds will react with NaNH_(2)?

Answer»

`CH_(3)--= CH`


`Ph-UNDERSET(O)underset(||)overset(O)overset(||)(S)-OH`

ANSWER :A::B::C::D
Discussion
50.

What is collected in the flask at the end in vapour phase distillation?

Answer»

SOLUTION :MIXER of pure liquid and WATER is obtained which is in TWO layer
Discussion