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 alkali metal is radioactive element?

Answer»

Cesium
Sodium
Rubidium
Francium

Answer :D
Discussion
2.

Which of the followingg reactions of methane is incomplete combustion?

Answer»


`2CH_(4)+O_(2) overset(Cu//523K//100" atm")to2CH_(3)OH`
`CH_(4)+O_(2) overset(Mo_(2)O_(3)) to HCHO+H_(2)O`
`CH_(3)+O_(2) to C_((s))+2H_(2)O_((l))`

Solution :`CH_(4)+O_(2) to C_((s))+2H_(2)O_((l))` is incomplete COMBUSTION. In COMPLETE combustion, hydrocarbons release `CO_(2)` and `H_(2)O` whereas in this reaction, C and `H_(2)O` are released.
Discussion
3.

Which are having less volume between Mg and Mg^(+2) ?

Answer»

SOLUTION :`Mg^(+2)` having LESS volume than Mg because effective nuclear charge of `Mg^(+20` ion is more.
Discussion
4.

Which of the following compounds gives curdy white precipitate in Lassaigne's test?

Answer»

`CH_(3)Br`
`C_(2)H_(5)I`
`CH_(3)CL`
`C_(6)H_(5)NO_(2)`

Answer :C
Discussion
5.

When an ideal gasexpands into vaccum, there is neither absorption nor evolution of heat. Why?

Answer»

SOLUTION :In an IDEAL gas, there are no intermolecular forces of attraction. Hence, no energy is required to overcome these forces,. Moreover, when a gas expands against vacuum,work doneis zero( because`P_(ext) =0)`. Hence, INTERNAL energy of the SYSTEM does not change,i.e., there is no ABSORPTION or evolution of heat.
Discussion
6.

The spotsof thecompounds havingthepropertyof fluoresencearedetectedbyplacing theTLCplateunder________.

Answer»

ultaviolet LIGHT
SODIUM vapourlamp
sunlight
X-rays

Answer :A
Discussion
7.

Upon heating phthalic anhydride with phenol in the presence of a little conc. H_(2)SO_(4)........is formed

Answer»

PHTHALIC acid
Phenyl acetate
Phenolphthalein
Phenylphthalate

Answer :C
Discussion
8.

Which of the following can be included in the category of colloids?

Answer»

Milk
Blood
Latex
All.

Answer :D
Discussion
9.

Which of the following practices will not come under green chemistry ?

Answer»

If possible, making use of soap made of vegetable oils INSTEAD of using synthetic detergents.
Using `H_2O`, for bleaching purpose instead of using CHLORINE BASED bleaching agents.
Using bicycle for travelling small distances instead of using petrol/diesel based vehicles
Using plastic CANS for NEATLY storing substances.

Solution : Plastic cans are not materials of green chemistry
Discussion
10.

What is COD?

Answer»

Solution :Chemieal oxygen demand (COD) is detined as the amount of oxygen required by the organic MATTER in a sample of WATER for its OXIDATION by a strong oxidising agent like `K_(2)Cr_(2)O_(7)` ACIDIC medium for a period of 2 HOURS.
Discussion
11.

Write the reaction of thermal decomposition of sodium azide.

Answer»

SOLUTION :Sodium AZIDE decomposes to form sodium METAL and `N_(2)` gas.
`2NaN_(3)OVERSET(Delta)to2Na+3N_(2)`.
Discussion
12.

When orthoboric acid (H_(3)BO_(3)) is heated strongly the residue left is

Answer»

boron
metaboric acid
boric ANHYDRIDE
borax

SOLUTION :`2H_(3)BO_3overset("strong")underset("HEATING")(RARR) underset("residue")(B_2O_3)darr+3H_(2)O`
Discussion
13.

This section contains questions each with two columns-I and II .Match the itemsgiven in columnI with that in column II.

Answer»


Solution :(a-q,R,s) At diagonal, two corner ions and one OV (at BODY center) lies.
(b-p,r,s,) `C_(4)` axis (tetrad axis) PASSES through two face-centered ions, body -centred ION (OV). (c-r) Rectangular plane passes through 4 face-centreed ions, 4 edge-centered ions, body-centered ion.
Discussion
14.

Which of the following will have most negative electron gain enthalpy? P,S,Cl,F

Answer»


ANSWER :F
Discussion
15.

Which or the following molecular orbitals has maximum number of nodal planes ?

Answer»

`sigma^(**) 1S`
`sigma^(**) 2p_(z)`
`pi 2p_(x)`
`pi^(**) 2p_(y)`

Solution :`sigma^(**) 2p_(z)`
NODAL PLANE are ,
`sigma^(**) 1s = 1, sigma^(**) 2p_(z) = 1 , pi 2p_(x) = 1 , pi^(**) = 2 `
Discussion
16.

Which of the ions has largest ionic radius?

Answer»

`Be^(2+)`
`MG^(2+)`
`CA^(2+)`
`SR^(2+)`

ANSWER :d
Discussion
17.

Which of the following covalent ions are highly present in biological compound ?

Answer»

NA
RB
LI
CS

ANSWER :A
Discussion
18.

Which one of the following is independent to the mass of the system?

Answer»

Density
MOLE fraction
MASS
MOLAR mass

Answer :C
Discussion
19.

Which elements does not give Hydride ?

Answer»

Te
Ti
Tl
Th

Answer :C
Discussion
20.

The well known mineral fluorite is chemically calcuim fluride. It is well known that in one unit of this mineral, there are4 Ca^(2+)ions and8 F^(-) ions, and thatCa^(2+)ions are arranged in a fcc lattice. TheF^(-)ions fill all the tetrahedral holes in the face - centred cubic lattice ofCa^(2+) ions. The edge of the unit cell is5.46 xx 10^(-8) cm in length . The density of the solid is 3.18 " g cm"^(-3) . Use this information to calculate Avogadro's number ( Molar mass ofCaF_(2)= 78.08 " g mol" ^(-1))

Answer»


ANSWER :(a) 51.8 (B) `11 . 62 xx 10^(23) `
Discussion
21.

Which stoichiometric defect in crystals increases the density of a solid ?

Answer»

SOLUTION :Intersitital DEFECT.
Discussion
22.

What is hydrolysis ? Give difference between unhydrolyse and hydrolyse ion.

Answer»

Solution :Definition : The process of interaction between WATER and cations/anions or both of salts is CALLED hydrolysis.
Salts FORMED by the REACTIONS between acids and bases in definite proportions, undergo ionization in water . The cations/anions formed on ionization of salts (i) Ether exist as hydrated ions in aqueous solutions or (ii)interact with water to reform corresponding acids/bases depending UPON the nature of salts. The pH of the solutiongets affected by this interaction.
Discussion
23.

What is the formula of yellow ppt. (E)?

Answer»

`HgSO_(4)`
`2HgSO_(4).HGO`
`2HgO.HgSO_(4)`
NONE of these

Answer :C
Discussion
24.

Which reaction is known as Kharash reaction ?

Answer»

Solution :REACTION of `Br_(2)` with ASYMMETRICAL ALKENE in presence of peroxide is known as KHARASH reaction.
Discussion
25.

Two pure substances of equal molar masses are alpha and beta (where alpha = AHCO_(3) and (beta = BCO_(3)] and they decomposes as shown: 2alpha overset(Delta)to H_(2)O + CO_(2) + A_(2)CO_(3)……………….(i) beta overset(Delta)to BO + CO_(2) ...................(ii) 6.2g of mixture of H_(2)O and CO_(2) is obtained by 16.8g of alpha. Find out the molar mass of alpha and beta and value of ((alpha + beta)/(2))^(2).

Answer»

84 each, 168.0
57.9 each, 3360
59.39 each, 3528
84 each, 7056

Answer :D
Discussion
26.

Write four species which act both as Bronsted acid as well as base. Write their corresponding conjugate acids and bases.

Answer»

SOLUTION :`{:("Conjugate acid ","SPECIES","Conjugate base",,),(H_(3)O^(+)" "OVERSET(+H^(+))larr,H_(2)O,overset(-H^(+))rarr" " OH^(-),,),(NH_(4)^(+)" "overset(+H^(+))larr,NH_(3),overset(-H^(+))rarr" " NH_(2)^(-),,),(H_(2)CO_(3)" "overset(+H^(+))larr,HCO_(3)^(-),overset(-H^(+))rarr" " CO_(3)^(2-),,), (H_(2)SO_(4)" "overset(+H^(+))larr,HSO_(4)^(-)," "overset(-H^(+))rarr" " SO_(4)^(2-),,):}`
Discussion
27.

Which element do you thick would have been named by (a) Lawrence Berkeley Laboratory (b) Seaborg's group

Answer»


ANSWER :(a) Lawrencium (Lr z = 103), (b) SEABORGIUM (Sg, z = 106)
Discussion
28.

The spectrumof he isexpectedto be similarto that of

Answer»

H
NA
`He^(+)`
`LI^(+)`

ANSWER :D
Discussion
29.

Which of the carbonates given below is unstable in air and is kept in co, atmosphere to avoid decomposition ?

Answer»

`BeCO_(3)`
`MgCO_(3)`
`CaCO_(3)`
`BaCO_(3)`

Solution :`BeCO_(3)` is stable only in atmosphere of `CO_(2)`. It is unstable due to strong polarizing effect of small SIZE of `Be^(2+)` ion.
Discussion
30.

What is the effect of added inert gas on the reaction at equilibium at constant volume ?

Answer»

Solution :When an inert GAS (i.e., a gas which does not react with any other species invoved in equilibium) is ADDED to an equilibrium system to constant volume, the total number of moles of gases present in the CONTAINER increases, that is, the total pressure of gases increases, the partial pressure of the reactants and the PRODUCT are unchanged. HENCE at constant volume, addition of inert gas has no effect on equilibrium.
Discussion
31.

Which of the following is non bio-degradable?

Answer»

Paper
GLASS
WASTE FOOD product
ROTTEN vegetable

Solution :glass
Discussion
32.

The value of n in the equation, Cr_(2)O_(7)^(2-) +14 H^(+)+ne^(-) to 2Cr^(3+) + 7H_(2)O is :

Answer»

2
3
4
6

Solution :N//A
Discussion
33.

Which of the following statement(s) are correct?

Answer»

`MnO_(2)` oxidizes halide ions into dihalogen
Reducing nature of halide ions follow the order, `F^(-) lt CI^(-) lt Br^(-) lt I^(-)`
Y' gas may be `I_(2)`, which turns KI-strach paper into blue colour.
Y' gas may be `CI_(2)` and `Br_(2)` which oxidises `KI` to `I_(2)` and turns strach paper blue.

Answer :A::B::C::D
Discussion
34.

Write the structural formula , bond line formula common and IUPAC name of C_(5)H_(12).

Answer»

SOLUTION :
Discussion
35.

Write expression for molar mass, M ( in kgmol^(-1) )of a body-centred cubic crystal of an ionic compound if it has an edge length of'a' metre and a density of 'd' kg m^(-3)

Answer»

Solution :`d = (Z xx M)/( a^(3) xx N_(A)) or M = dxx a^(3) xx N_(A)`(as for ionic compound having BCC structure , Z =1)
Discussion
36.

Which of the following does not change during compression of a gas at constant pressure-

Answer»

DENSITY of a gas
distance between molecules
average SPEED of molecules
the NUMBER of collisions

Answer :C
Discussion
37.

Which of the following molecules are homoatomic ? (i) H_(2)O, (ii) O_(3), (iii) NH_(3), (iv) Cl_(2)

Answer»


ANSWER :`O_(3)` and `Cl_(2)`
Discussion
38.

Which metal alloy tanks are used for storage of dihydrogen

Answer»

`NaNi_(5)`
`Ti-TiH_(2)`
`Mg-MgH_(2)`
All

Answer :D
Discussion
39.

Which is the correct statement ?

Answer»

Minimum BOILING AZEOTROPIC MIXTURE boils at temperature lower than either of the two pure components.
Maximum boiling azeotropic mixture boils at temperature higher than either of the two pure components.
Minimum boiling azeotropic mixture shows (+)ve deviation
Maximum boiling azetropic mixture shows (-)ve deviation.

Answer :A::B::C::D
Discussion
40.

Under what conditions, hydrogen behaves as a metal?

Answer»

SOLUTION :Under very high PRESSURE, hydrogen BEHAVES as a METAL.
Discussion
41.

Which of the following statement is not true for benzene?

Answer»

It is planar molecule 
All C-C bond LENGTHS are equal 
The resonance ENERGY is 36 kcal/mole
It CONTAINS three localised pi bonds 

Answer :D
Discussion
42.

What type of graph will you get when PV is plotted against P at constant temperature.

Answer»

SOLUTION :A STRAIGHT line parallel to PRESSURE AXIS.
Discussion
43.

Which of the following does not represent polymerisation of alkenes and alkynes?

Answer»

`nCH-=Chto(--CH=CH-CH=CH--)_(n)`

`nCH_(3)-CH=CH_(2)to UNDERSET(CH_(3))underset(|)((--CH-CH_(2)--))_(n)`
`nCH_(2)=CH_(2) to (--CH_(2)-CH=CH-CH_(2)--)_(n)`

Solution :`nCH_(2)=CH_(2) underset("pressure, catalyst")overset("HIGH temp.")to (--CH_(2)-CH_(2)--)_(n)`
A linear polyethene polymer is FORMED when ethene polymerises.
Discussion
44.

Which reaction indicates the oxidising behaviour of H....

Answer»

`2PCl_(5) +H_(2)SO_(4) rarr 2POCl_3 +2HCl +SO_(2)Cl_2`
`2NaOH + H_(2)SO_(4)rarr Na_(2) SO_4 +2H_(2)O`
`NACL +H_(2)SO_(4)rarr NaHSO_4 +HCl`
`2HI + H_2SO_(4) rarr I_2 +SO_2 +2H_2O`

SOLUTION :`2HI+underset(O.A)overset(+6)(H_2SO_4)rarrI_2+overset(+4)(SO_2)+2H_2O`
Discussion
45.

The structural formula of lithium tetrahydrido-aluminate is

Answer»

`Al[LiH_(4)]`
`Al_(2)[LiH_(4)]_(3)`
`LI[AlH_(4)]`
`Li[AlH_(4)]_(2)`

ANSWER :C
Discussion
46.

Which of the following minerals contain aluminium ?

Answer»

Fluorspar
FELDSPAR
Mica
Carborundum

SOLUTION :Fluorspar : `CaF_2`
Feldspar : `KAlSiO_(3)O_8`
Mica : `K_(2) O.3 Al_(2) O_(3) . 6SiO_(2) . 2H_(2) O`
Carborundum : Sic
Discussion
47.

The volume of O_2 gas evolved from 40 gram per litre H_2O_2 at STP is.....

Answer»

22.4
11.2
33.6
13.18

Solution :MOLARITY = `"gram/LITRE"/"MOLECULAR mass"=40/34=1.176 M H_2O_2`
`V(O)_2=11.2xxM`
=11.2 x 1.176
=13.18 litre `O_2` RELEASE
Discussion
48.

Which one of the following has coordinate covalent bond?

Answer»

ALKALI METALS
Metals
NON metals
Metalloids

Solution :Non metals
Discussion
49.

What is Z in the following sequence of reactions ? Phenol overset("Zn dust")rarr X underset("anhyd." AlCl_(3))overset(CH_(3)Cl)rarr Z

Answer»

Toluene
Benzene
Benzoic acid
Benzaldehyde

Solution :
Discussion
50.

Which of following statement(s) point is maximum. (P) Slope of isotherm at critical point is maximum. (Q) Larger is the value of T_(c) easier is the liquification of gas. (R) van der Waal's equation of state is applicable below critical temperature at all pressure.

Answer»

Only P
P andQ
Q and R
Only Q

Answer :B
Discussion