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 active mass of water ?

Answer»

SOLUTION :55.55 MOL `L^(-1)`
Discussion
2.

Which of the following is a saline hydride?

Answer»

HCL
`NH_3`
`NAH`
`PBH`

SOLUTION :`NaH`
Discussion
3.

Which of the following compounds will produce the most stable carbonium ion when heterolytic cleavage of C-O bond take place ?

Answer»

`CH_(3)CH-UNDERSET(underset(CH_(3))(|))(CH_(2))-OH`
`CH_(3)-underset(underset(CH_(3))(|))overset(overset(CH_(3))(|))(C)-OH`
`CH_(3)-underset(underset(OH)(|))(CH)-CH_(2)-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH`

SOLUTION :`ALPHA` stability of carbocatcon is `alpha +I` effect.
Discussion
4.

The volume of H_(2)STP required to completely reduce 160 gms of Fe_(2)O_(3) is

Answer»

`3 xx 22.4L`
`2 xx 22.4L`
`22.4L`
`11.2L`

SOLUTION :`Fe_(2)O_(3)+3H_(2) RARR 2Fe +3H_(2)O`
Discussion
5.

The violent reaction between sodium and water is an example of "_________________".

Answer»

reduction
oxidation
redox reaction
neutralization reaction

Answer :C
Discussion
6.

Which of the following statements about hydrogen 1 is incorrect ?

Answer»

HYDROGEN ion, `H_(3)O^(+)` exists FREELY in solution.
Dihydrogen acts as a REDUCING agent.
 Hydrogen has three isotopes of which TRITIUM is the most common.
Hydrogen never acts as CATION in ionic salts.

Solution : Hydrogen has three isotopes of which protium is the most common
Discussion
7.

Which of the following pairs has almost same radii ?

Answer»

`Al, Ga`
`Be,Mg`
`Mg,Cl`
`B,Be`

SOLUTION :Due to INERT pair EFFECT, Al and Ga have nearly same ATOMIC RADII.
Discussion
8.

Which type of Na and K metal salts are more present in ash of plant ?

Answer»

`PO_(4)^(-3)`
`CO_(3)^(2-)`
`SO_(4)^(2-)`
`NO_(3)^(-)`

ANSWER :B
Discussion
9.

What doyou understand byexothermicreaction andendothermicreaction? Giveone exampleofeach type.

Answer»

Solution :Exothermicreactions . Reactions WHICHARE accompaniedby evolution ofheatare calledexothermic reactions. The quantityof heatproducedis showneitheralongwith theproducts WITHA plussignor intermsof `DeltaH`with anegativesign. forexample.
`C ( s)+ O_(2)( g) toCO_(2)( g) +393. 5 kJ`
` H_(2) (g) + (1)/(2) O_(2) (g)toH_(2) O(l) , Delta H=-285.8 kJ MOL^(-1)`
Endothermicreactions. Reactions whichproceed withabsorption ofheatare calledendothermicreactions . the quantityof heatabsorbed is shown eitheralong withthe PRODUCTS witha negativesign orintermsof `DeltaH`with apositivesign. Forexample
` C ( s)+ H_(2) O( g) toCO (g)+ H_(2)( g) -131 .4 kJ`
`N_(2)( g) +3 H_(2)( g) to2 NH_(3)( g) Delta H=- 92 kJ mol^(-1)`
Discussion
10.

Which of the following is a free radical?

Answer»

`NO_(2)^(-)`
`CL^(-)`
`Cl^(*)`
`Cl^(+)`

SOLUTION :`overset(*)(Cl)` has one FREE ELECTRON.
Discussion
11.

The standard molar enthalpies of formation of cyclohexane(l ) and benzen(l) at25^(@) are - 156 and + 49 kJ mol^(-1) respectively. The standard enthalpy of hydrogenationof cyclohexene( l) at 25^(@)C is-119 kJ mol^(-1) . Use these data to estimate the magnitudeof the resonanceenergy of benzene.

Answer»

Solution :Standard enthalpyof hydrogenation of cyclohexene`= -119 KJ mol^(-1)`. This is the observedenthalpy of hydrogenation ofone double bond ( PRESENT in cyclohexene) . If benezene is considered as cyclohexatriene, the observed ENTHALPY of the reaction.
wouldbe `= 3 xx(-119)=- 357 kJ mol^(-1)`
Calculated enthalpy of the above reaction is
`Delta_(r)H =DeltaH_(f)^(@)(C_(6)H_(14)) - [ DeltaH_(f)^(@) (C_(6)H_(6))+3DeltaH_(f)^(@)(H_(2))]= - 156 - ( 49+0) = - 2205 kJmol^(-1)`
`:. `Resonance energy = Observed`Delta_(r)H^(@) -` Calculated`Delta_(r)H^(@)`
`= ( - 357 ) - ( - 205) kJ mol^(-1) = -152 kJ mol^(-1)`
Discussion
12.

Thermal decomposition temperature is more for

Answer»

`NaHCO_(3)`
`CsHCO_(3)`
`RbHCO_(3)`
`KHCO_(3)`

ANSWER :B
Discussion
13.

Which of the following is correct resonance structure of CH_(3)OO^(-) ?

Answer»




ANSWER :B
Discussion
14.

Which of the following element is not consider in group - I-A ?

Answer»

LI
K
RB
SR

ANSWER :D
Discussion
15.

What is eluant?

Answer»

Solution :ELUANT is mobile PHASE used in CHROMATOGRAPHY in which the compound move SLOWLY over the stationary phase
Discussion
16.

When CO_(2) is passed into Ca(OH)_(2) a white precipitate is formed due to the formation of

Answer»

`CaCO_(3)`
`CA(HCO_(3))_(2)`
`CaC_(2)`
None

Answer :A
Discussion
17.

What is the spin of two electron in He ?

Answer»

SOLUTION :Both are in OPPOSITEDIRECTION`+(1)/(2) ` and `(1)/(2)`
Discussion
18.

Which of the following is not correct with regard to the structure of diborane?

Answer»

FOUR TERMINAL hydrogen atoms and TWO bridged hydrogen atoms
The terminal hydrogen atoms and BORON atoms lie in a plane
Four two centre bonds and two three centre bonds
The `sp^(3)`-hybrid orbitals of the boron atoms have one electron each.

Answer :D
Discussion
19.

Which of the following compound will give four monochloro (structural) product on monochlorination.

Answer»




ANSWER :D
Discussion
20.

Which of the following is/are primary pollutant,, (A) Ozone(B) SO_(2) ""(C) SO_(3) ""(D) NO_(2) "" PBN

Answer»

A,C and E
B and D
A,B and D
C,D,E

Answer :B
Discussion
21.

Which of the following fcc structure contains cation in alternate tetrahedral voids ?

Answer»

NaCl
ZnS
`Na_(2)O`
`CaF_(2)`

Solution :In `ZnS, Zn^(2+)` occupies alternate TETRAHEDRAL VOIDS.
Discussion
22.

Writeshort notes on corey housereaction

Answer»

SOLUTION :An alkylhalideand lithiumdialkylcuprateare reactedto givehigheralkanes . THISREACTIONIS KNOWAS Corey -Housereaction.
Discussion
23.

Write the chemical formula of plaster of Paris.

Answer»

SOLUTION :`(CaSO_4)_2 . H_2O`
Discussion
24.

Write equation of ionization constant of weak base MOH.

Answer»

Solution :`K_b=([M^+][OH^-])/"[MOH]"=(c ALPHA^2)/((1-alpha))`
Here, `alpha`=dissociation constant of BASE
c= initial concentration of base
Discussion
25.

Zinc oxide is white but it turns yellow on heating. Explain.

Answer»

Solution :When ZnO is heated, it loses oxygen according to the reaction :`ZnO to Zn^(2+) + 1/2O_2 + 2e^(-)`
`Zn^(2+)` ions are entrapped in the interstitial voids and electrons in the neighbouring interstitial voids to maintain electrical neutrality. This GIVES RISE to metal defect. Due to presence of electron in the interstitial voids (F-centres), the COLOUR is yellow as the REMAINING colours of white light are absorbed by these electrons.
Discussion
26.

What is acid rain ?

Answer»

SOLUTION :When the pH of the RAIN water DROPS below 5.6. It is called ACID rain.
Discussion
27.

Which one is the correct order of ionic radii of following ions ?

Answer»

<P>`Ti^(4+) LT Mn^(7+)`
`.^(35)Cl lt .^(37)Cl`
`K^(+) GT Cl^(-)`
`P^(3+) gt P^(5+)`

ANSWER :d
Discussion
28.

Which of the following is the most powerful oxidizing agent ?

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`

Solution :Fluorine is the most POWERFUL oxidizing AGENT because it has `E^(@)=+2.5` volt.
Discussion
29.

Which of thefollowingpairscontainmetalloid elementsin the periodictable ?

Answer»

NA and K
F andC1
Ca and Mg
As and SI

SOLUTION :NA
Discussion
30.

When metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl to form compound (C). The compound (A) when heated strongly gives (D), which is used to extract metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support their identities.

Answer»

Solution :The given metal X gives a white precipitate with sodium hydroxide and the precipitate dissolves in excess of sodium hydroxide. Hence, X MUST be aluminium. The white precipitate (compound A) obtained is aluminium hydroxide. The compound B formed when an excess of the base is added is sodium tetrahydroxoaluminate (III).
`underset"(X)"(2AL)+3NaOH to underset"(ppt)"(Al(OH)_3) darr + 3Na^(+)`
`underset"(A)"(Al(OH)_3) + NaOH to underset"Sodium tetrahydroxo aluminate (III)"(NA^+ [Al(OH)_4]^(-))`
Now, when dilute hydrochloric acid is added to aluminium hydroxide, aluminium chloride (compound C) is obtained.
`underset"(A)"(Al(OH)_3) + 3HCl to underset"(C)"(AlCl_3) + 3H_2O`
Also, when compound A is HEATED strongly, it gives compound D. This compound is used to extract metal X. Aluminium metal is extracted from alumina. Hence, compound D must be alumina.
`underset"(A)"(2Al(OH)_3) oversetDeltato underset"(D)"(Al_2O_3) + 3H_2O`
Discussion
31.

The solubility of gypsum in water increases of ammonium sulphate due to the formation os

Answer»

Mixed SALT
Basic salt
Complex salt
Double salt

Solution :The SOLUBILITY of GYPSUM in WATER increases by the addition of `(NH_(4))_(2)SO_(4)` due to formation of double salt
Discussion
32.

What is H-C-H bond angle in methane ?

Answer»

SOLUTION :`109^(@),28`.
Discussion
33.

Which of the following factor affects ionisation energy ? SSSon : S (2) s - sub orbit nearest to nucleus.

Answer»

Size of the ATOM
Magnitude of the NUCLEAR charge
Electronic configuration
All of these

SOLUTION :All of these factor are affects ionisation ENERGY.
Discussion
34.

Which one of the following statement is not true?

Answer»

CLEAN water would have a BOD value of less than 5 ppm
oxides of SUPHUR NITROGEN and carbon are the most widesperead ari [POLLUTANT
ph of drinking water should be between 5.5-9.5
concentration of DO below 6 ppm is good for the growth of fish

Solution :More the concentration of D.O better it is for the growth of the fishes
Discussion
35.

Which of the following is not true in case of reaction with heated copper at 300^(@)C ?

Answer»

Phenol `RARR` BENZYL alcohol
Primary alcohol `rarr` Aldehyde
Secondary alcohol `rarr` Ketone
Tertiary alcohol `rarr` Olefin

Solution :Phenol when HEATED with copper at `300^(@)C` do not GIVE benzyl alcohol.
Discussion
36.

Write the common name for the following compounds. (i)CH_(3)OH (ii) C_(2)H_(5)OH (iii) C_(2)H_(5)-O-C_(2)H_(5) (iv) CH_(3)COOH

Answer»

Solution :(i) Methyl alcohol
(ii) ETHYL alcohol
(III) DI ethyl ETHER
(iv) Acetic acid
Discussion
37.

Which of the following not avaible in nature heated

Answer»

`BeCO_(3)`
`MgCO_(3)`
`SrCO_(3)`
`MgCI_(2)`

SOLUTION :`BeCO_(3)` has no NATURAL occurrence so it is not OCCUR in its NATIVE state.
Discussion
38.

What is the solubility product (K_(sp)) ?

Answer»

Solution :At definite TEMPERATURE the product or concentration of ions of sparingly soluble salt is called solubility product `K_(SP)`.
Discussion
39.

What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3,1 = 1, m_(l) = 0

Answer»

3d
3p
3s
4s

Answer :B
Discussion
40.

Total number of atoms in 90 g of water are.........

Answer»


ANSWER :`9.0 XX 10^(24)`
Discussion
41.

Which of the following on thermal decomposition yields a basic as well as an acidic oxide ?

Answer»

`KClO_(3)`
`CaCO_(3)`
`NH_(4)NO_(3)`
`NaNO_(3)`

Solution :`CaCO_(3) overset(Delta)(to) underset("(BASIC)")(CaO) + underset("(ACIDIC)")(CO_(2))`
Discussion
42.

Write the relation between standard free energy change and equilibrium constant K_(p) for a reversible reaction.

Answer»

SOLUTION :Relationship between standard free energy change `Delta G^(@)` and the EQUILIBRIUM CONSTANT `K_(p)` is `Delta G^(@) = -2.303 RT log K_(p)`, where R is the gas constant `= 8.314 JK^(-1)` and T is the temperature in Kelvin.
Discussion
43.

Which of the following is the most stable carbocation

Answer»




All are EQUALLY stable

Solution :`-NO_2` is at META POSITION has no influency by -I EFFECT.
Discussion
44.

Which of the following pairs of elements would have a more negative electron gain enthalpy? (i) O or F (ii) F or Cl

Answer»

SOLUTION :(i) F (II) Cl
`O (-141), F (-328) " and " Cl (-349) kJ "mol"^(-1) Delta_(eg) H`.
Discussion
45.

Which of the following has zero electron density in xy plane ?

Answer»

<P>`d_(z^(2))`
`d_(x^(2)- y^(2))`
`p_(z)`
`d_(xy)`

Solution :`p_(x)` ORBITAL has zero electron density in the xy PLANE.
Discussion
46.

Which product is formed on chlorination of (CH_(3))_(3)CH ? Also give comparison of their composition.

Answer»

SOLUTION :`overset(1^(@))(C)H_(3)-underset(""^(1^(@))(CH_(3)))underset(|)overset(1^(@))(CH)-overset(1^(@))(CH_(3))underset(hv)overset(Cl_(2))rarrunderset((A))underset(3^(@)"butylchloride")(CH_(3)-underset(CH_(3))underset(|)overset(Cl)overset(|)(C)-CH_(3))+underset((B))underset(1^(@)-"chloride")underset(CH_(3))underset(|)(CH)-CH_(2)Cl`
A and B both are obtained from the monochloroalkane, (A) proportion `gt` product (B) proportion. Because compound (A) formed which DEPEND on production RATE of `3^(@)` hydrogen `gt` (B) formed which depends on `1^(@)` hydrogen atoms.
Discussion
47.

Which cations can be removed by ion exchange method ?

Answer»

Ca and Mg
K and Na
Ba and Al
U and RA

SOLUTION :Ca and Mg
Discussion
48.

The type of isomerism not found in alkenes is :

Answer»

CHAIN isomerism
Geometrical isomerism
Metamerism
Position isomerism

Answer :C
Discussion
49.

What are the applications of Dalton's law of partial pressure?

Answer»

SOLUTION :(i) Physicians reports the pressure of the patient.s gases in BLOOD , analyzed by hospital lab, the values are reported as partial pressures.
Gas `""` Normal range
`P_(CO_(2)) ""` 35-45 mm of Hg
`P_(O_(2)) ""` 80-100 mm of Hg
(II) When gas is colleted by downward displacement of water , the pressure of dry vapour collected is computed USING Dalton.s law.
`P_("dry gas colleted") = P_("Total") = P_("Water vapour")`
`P_("water vapour")` = Aqueous tension
Discussion
50.

When does Frenkel defect arise ? Give reason .

Answer»

Solution :When some IONS (usually cations) are missing from the lattice sites and they occupy the interstitial sites so that electrical neutrality as WELL as stoichiometry is MAINTAINED , it is called FRENKEL defect.
Discussion