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 of the correct stability order of oxy anions given below ?

Answer»

`(II) GT (I) gt (IV) gt (III)`
`(I) gt (II) gt (III) gt (IV)`
`(II)gt(I) gt (III) gt (IV)`
`(I) gt (II) gt (IV) gt(III)`

ANSWER :D
Discussion
2.

Whichunits are used to measure fraction of mass ?

Answer»



SOLUTION :GM, MILLIGRAM, MICROGRAM ETC.
Discussion
3.

Which statement are correct ?

Answer»

The ENERGIES of the virous sub-levels in the same shell of H-atom are in order `s gt p gt d gt f`.
s-ORBITAL in non-directional
Electrons in motion behave as if they are particles
An orbital can accommodate a maximum of TWO electrons with parallel spins.

Answer :B
Discussion
4.

Which of the following has coordinate covalent bond?

Answer»

`H_(2) O `
`CaCl_(2)`
`O_(3)`
`N_(2)`

SOLUTION :`O_(3)`
Discussion
5.

Write the cell reaction for each of the following cells. Pt,H_(2)(g)|H^(+)(aq)|Ag^(+)(aq)|Ag(s)

Answer»

Solution :`H_(2)(G)+2AG^(+)(AQ)to2H^(+)(aq)+2Ag(s)`
Discussion
6.

Which of the following compounds will show cis-trans isomerism ? (i) (CH_(3))_(2)C=CH-C_(2)H_(5) (ii) CH_(2)=CBr_(2) (iii) C_(6)H_(5)CH=CHC_(6)H_(5) (iv) CH_(3)CH=C ClCH_(3)

Answer»

Solution :(i) `(CH_(3))_(2)C=CH-C_(2)H_(5)` :
This structure do not show isomerism because ONE carbon having two same `CH_(3)` groups.
(ii) `CH_(2) = CBr_(2)` :
This COMPOUND do not show isomerism because two same FUNCTIONAL group is present on one carbon.
(III) `C_(6)H_(5)CH = CHC_(6)H_(5)` : This compound shows isomerism because carbon is having different groups.

(IV) `CH_(3)CH=C ClCH_(3)` : This compound shows isomerism as both carbon is having different groups.
Discussion
7.

When the first element of the periodic table is treated with dioxygen, it gives a compound whose solid state floats on its liquid state. This compound has an ability to act as an acid as well as a base. What products will, be formed when this compound undergoes autoionisation ?

Answer»

Solution :The first element of the periodic table is hydrogen and its molecular FORM is dihydrogen `(H_2)`. When dihydrogen reacts with dioxygen water is formed. Water is a liquid at room temperature. When liquid water freezes, it expands to form ice. In other words DENSITY of ice is lower than that of liquid water and hence ice floats over water.
Water is amphoteric in nature. It acts as an acid in presence of STRONG bases and as a base in presence of strong acids.
`underset("Base"_1)(H_2O_((l)))+ underset("Acid"_2)(H_2S_((aq)))to underset("Acid"_1)(H_3O_((aq))^(+))+ underset("Base"_2)(HS_((aq))^(-))`
`underset("Acid"_1)(H_2O_((l)))+ underset("Base"_2)(NH_(3(aq))) to underset("Acid"_2)(NH_(4(aq))^(+)) + underset("Base"_1)(OH_((aq))^(-))`
Due to amphoteric character , water undergoes self ionisation as FOLLOWING :
`underset("Acid"_1)(H_2O_((l)))+ underset("Base"_2)(H_2O_((aq)))hArr underset"(Conjugate acid)"underset("Acid"_2)(H_3O_((aq))^+)+ underset"(Conjugate acid)"underset("Base"_1)(OH_((aq))^(-))`
This self ionisation of water is called auto protolysis.
Discussion
8.

What is thedifferencebetweenphotonandquantum ?

Answer»

SOLUTION :Photonis onlyfor lightbutqunatumis apacketof ENERGY`(E= 2Sigma )` and itcanbe fromanysource
Discussion
9.

What happens when bromoethane is treated with moist silver oxide?

Answer»

SOLUTION :When bromoethane is treated with MOIST silver oxide. ethanol will be formed as PRODUCT:
`underset("Bromoethane") (CH_(3) - CH_(2) Br) + underset("silver oxide") underset("Moist") (AgOH) overset("Boil") CH_(3) underset("Ethanol") (- CH_(2) OH) + AgBr`
Discussion
10.

Which one of the following reactions does not correspond to the preparation of ..Synthetic gasoline.. during the Fscher-Tropsch process ?

Answer»

`CO+3H_(2)toCH_(4)+H_(2)O`
`"n CO"+2" n "H_(2)tonCH_(3)OH`
`"n CO"+2nH_(2)toC_(n)H_(2n)+nH_(2)O`
`"n CO"+(2n+1)H_(2)toC_(n)H_(2n+2)+nH_(2)O`

ANSWER :C
Discussion
11.

Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride?

Answer»

THIOUREA
diphenyl sulphide
phenylhydrazine
benzamide

Solution :Thiourea `(NH_(2)CSNH_(2))` contains both N and S and hence GIVES blood red colouration in Lassaigne's test.
Discussion
12.

Which of the following hydrogen bonds is the strongest ?

Answer»

O - H ---F
O - H ---H
F - H ---F
O - H ----O

Solution :F - H ---F
Because of HIGHEST electronegativity of F, HYDROGEN bonding in F - H - - - F is STRONGEST
Discussion
13.

The viscosity order of water , n - hexane and glycerolis

Answer»

n - hexane `GT` water `gt` glycerol
water `gt` n-hexane `gt` glycerol
glycerol `gt` water `gt`n - hexane
glycerol `gt` n- hexane `gt` water

Solution :Intermolecular FORCES of ATTRACTIONS are maximum in glycerol and MINIMUM in n- hexane
Discussion
14.

Write the descending order of electron affinity values of chalcogens.

Answer»

Solution :Decreasing ORDER of electron affinity values of chalcogens: S > Se > TE > O
Electron affinity of oxygen is less because oxygen hassmall atomic size and the added electron EXPERIENCES greater repulsion on oxygen atom.
Discussion
15.

The Schrodinger wave equation for hydrogen atom is Ps ("radial") =1/(16sqrt4) ((Z)/(a_0))^(3//2) [ (sigma -1) (sigma^2 - 8 sigma + 12 )]e^(-sigma//2) where a_0 and z are the constant in which answer can be expressed and sigma =(2pi)/(a_0) minimum and maximum position of radial nodes from nucleus are

Answer»

`(a_0)/(Z), (3a_0)/(Z)`
`(a_0)/(2Z) ,(a_0)/(Z)`
`(a_0)/(2Z), (3a_0)/(Z)`
`(a_0)/(2Z), (4a_0)/(Z)`

Solution :Probability of FINDING `e^-` is zero impliesthat `Psi^2 = 0 ` or `Psi=0`
`IMPLIES(sigma -1) = 0 impliessigma =1`
or `r_1 =(a_0)/(2z) ` or `(sigma^2 - 8 sigma + 12) =0 ` and `(sigma-6 ) (sigma-2)=0`
`sigma=6, r= (3a_0)/(z) , sigma = 2 , r = (a_0)/(z) , r_2 = (3a_0)/(z)`
Discussion
16.

The volume of gas is reducedto half from its original volume. The specific heat will "…................".

Answer»

REDUCE to half
be doubled
remain constant
increase four times.

Solution :SPECIFICHEAT is anintensive property dependingonly on the nature of the GAS.
Discussion
17.

Which one of the following contains ionic , covalent and coordinate bonds ?

Answer»

`NaOH`
NaCl
NaCN
NaNC

Solution :`Na^(+) N UNDERSET(to)=C^(-)`contains IONIC , covalent and
coodinate BONDS.
Discussion
18.

Which of the following has maximum bond angle ?H_(2)O, CO_(2), NH_(3), CH_(4).

Answer»

Solution :`CO_(2), 180^(@)` (due to LINEAR STRUCTURE)
Discussion
19.

Which compond of sodium is used for washing purposes in laundry ?

Answer»

SOLUTION :`Na_2CO_3`
Discussion
20.

You have the mixture of three liquids (A), (B) and (C). There is a large difference in the boiling points of (A) and rest of the two liquids i.e. (B) and (C). Boiling point of liquids (B) and (C) are quite close. Liquid [A] boils at a higher temperature than [B] and [C] and boiling point of (B) is lower than that of (C). How will you separate the components of the mixture. draw a diagram showing set up of the apparatus for the process.

Answer»

Solution :(i) SUBJECT the mixture of three liquid to simple distillation. Both liquids (B) and (C) will distil since these are low boiling, leaving behind liquid (A) in the distillation flask. This can be recovered from the flask.
(II) Now subject the mixture of liquids (B) and (C) obtained as distillate to farctional distillation. Liquid (B) will GET distilled since it has less boiling point. Lquid (C) will be LEFT in the distillation flask. In this manner, the separation can be DONE.
The separation can be represented by a flow sheet diagram.

For the apparatus of simple distillation, consult section 13.45
For the apparatus of fractional distillation, consult section 12.36.
Discussion
21.

Which of the following anions is present in thechain structure of silicated ?

Answer»

`SiO_(4)^(4-)`
`Si_(2)O_(7)^(6-)`
`(Si_(2)O_(5)^(2-))_(n)`
`(SiO_(3)^(2-))_(n)`

Solution :CHAIN STRUCTUREOF silicatescontain `(SiO_(3)^(2-))_(n)` anions.
Discussion
22.

There are equal volumes of N_2 and CO_2 gases at 25^@C and 1 atm. Then indicate the correct statements among the following

Answer»

The RMS velocity remains the same for `N_2` and `CO_2` gases 
The average TRANSLATIONAL K.E per molecule is the same for `N_2` and `CO_2` 
The DENSITY of `N_2` is less than that of `CO_2`
The TOTAL translational K.E of both `N_2` and `CO_2` is the same 

Solution :Equal volumes, P, T = same n
average `KE = 3/2 KT , d alpha M`
Total KE = `3/2 NRT`.
Discussion
23.

To which of the following species, the Bohr theory is not applicable ?

Answer»

He
`LI^(2+)`
`He^(2+)`
H atom

Answer :A::C
Discussion
24.

Which type of mix solution Ba(OH)_2 of 20 ml 0.01 M H_2SO_4 and 20 ml 0.01 M ?

Answer»

NEUTRAL
ACIDIC
PH `LT` 7
Basic

Answer :A
Discussion
25.

Which are the conjugate base of strong acid HClO_4, H_2SO_4, HNO_3 and H_3PO_4 ? It is strong or weak ?

Answer»

SOLUTION :`ClO_4^(-) , HSO_4^(-), NO_3^(-)`and `H_2PO_4^(-)` all are CONJUGATE BASE of STRONG ACID
Discussion
26.

Which calcium compound is not aapreciably more soluble in 0.1 M hydrochloric acid than it is in pure water?

Answer»

Limestone, `CaCO_(3)`
SLAKED LIME, `Ca(OH)_(2)`
GYPSUM, `CaSO_(4).2H_(2)O`
HYDROXYAPATITE, `Ca_(5)(OH)(PO_(4))_(3)`

Solution :N//A
Discussion
27.

Whodevelopedfundamentalequationofquantummechanics ?

Answer»

SOLUTION :The fundamentalequantumof quantummechanicswas DEVELOPED by ErwinSchrodingerphysisin 1933.
Discussion
28.

Which of the following oxides shows electrical properties like metal ?

Answer»

`SiO_2`
MGO
`SO_2(s)`
`CrO_2`

ANSWER :d
Discussion
29.

The correct match is

Answer»

II
III
IV
V

Solution :
Discussion
30.

The van der Waals constant 'b' for oxygen is 0.0318 L mol^(-1). Calculate the diameter of the oxygen molecule.

Answer»

Solution :b=4 vor`v=(b)/(4)=(0.0318)/(4)=7.95xx10^(3) L MOL^(-1)=7.95 cm^(3) mol^(-1)`
`:. "Volume occupied by one " O_(2) " molecule"=(7.95)/(6.02xx10^(23))=1.32xx10^(-23)cm^(3)`
Cosidering the molecule to be SPHERICAL, `(4)/(3)pi r^(3)=1.32xx10^(-23)" or " r^(3)=3015xx10^(-24)`
`:. 3 log r=log(3.15xx10^(-24))=-24+0.4983=-23.5017`
or`log r=-7.8339=bar(8).1661`
`:. "Diameter of oxygen molecule "=2xxr=2xx1.466xx10^(-8)cm=2.932xx10^(-8)cm=2.932Å`
Discussion
31.

Why boron trihalides act as Lewis acids ?

Answer»

Solution :The boronatom intrihaldieshas only SIX electrons in the VALENCE shell and HENCE canaccept a pair ofelectronsin the VACANT p-orbitalto completeits octet. As a RESULT,boron trihaldiesact as aLewis acids.
Discussion
32.

Write one chemical reaction for the preparation of D_(2)O_(2).

Answer»

Solution :By the ACTION of `D_(2)SO_(4)` in dissolved in WATER over `BaO_(2)`
`BaO_(2) + D_(2)SO_(4) to BaSO_(4) + D_(2)O_(2)`
Discussion
33.

Which product is obtained when benzene is heated with CH_(3)Cl in presence of AlCl_(3) ? Why ?

Answer»

Solution :Toluene and MIXTURE of o-and p-XYLENE is obtained when BENZENE is heated with `CH_(3)Cl` in presence of `AlCl_(3)`.

We ALWAYS write the reaction of toluene from the benzene. But the reactivity of `-CH_(3)` group oftoluene, which is ortho, para DIRECTING, on alkylation of toluene ortho xylene and para xylene is obtained.
Discussion
34.

When the speed of electron increases, its specific charge

Answer»

Increases
Decreases
Remains unchanged
Increases and then decreases

Answer :B
Discussion
35.

The volume occupied by 64 g of SO_2 at S.T.P. is……………..

Answer»


ANSWER :22.4 L
Discussion
36.

Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. However, the correct reading is 5.0 g. On the basis of the data, mark the correct option {:("Student",:underset("(i)(ii)")("Readings")),("A","5.014.99"),("B","5.054.95"):}

Answer»

RESULTS of both the students are neither accurate nor PRECISE
Results of STUDENT A are both accurate and precise
Results of student B are neither precise nor accurate
Results of student B are both precise and accurate

Answer :B
Discussion
37.

Which of the following oxide is amphoteric ?

Answer»

`SnO_2`
`SiO_2`
`CO_2`
`CAO`

ANSWER :A
Discussion
38.

When will be K_(p) lt K_C ? Give two example

Answer»

<P>

Solution :When `Delta n_(G) = - ve K_(p) lt K_(c). (RT)^(-vc)`
`K_(P) lt K_(c) .` Examples
`2H_(g) + O_(2)(g) hArr 2H_(2) O(g)`
`Delta n_g = 2-3 = -1`
`K_p = K_c. (RT)^(-1)`
`thereforeK_(p) lt K_(c)`
Discussion
39.

Which law is signified by the equation : V_t = V_0 (1+ t/273) State the law in a different manner.

Answer»

SOLUTION :CHARLES. LAW.
Discussion
40.

Which one of the following elements reacts with steam?

Answer»

`C`
`SI`
`Ge`
`Sn`

ANSWER :B
Discussion
41.

The temperature at which the solid and liquid phases of a substance are at equilibrium is called …………..

Answer»

SOLUTION :FREEZING POINT
Discussion
42.

What happens when butanoic acid is heated with soda-lime at 630 K ? Is there any other acid which also gives the same product under similar conditions. Write its name and the reaction involved .

Answer»

Solution :Butanoic ACID undergoes decarboxylation to give propane when heatedwith soda-lime at 630 K .
`underset"Butanoic acid"(CH_3CH_2CH_2COOH)+2NaOH underset"(Decarboxylation)"OVERSET"CaO, 630 K"to underset"Propane"(CH_3CH_2CH_3)+ Na_2CO_3+ H_2O`
2-Methylpropanoic acid is the position isomer of butanoic acid. This ALSO on decarboxylation with soda-lime give propane.
Discussion
43.

What is the difference between atomic mass and mass number ?

Answer»

Solution :MASS NUMBER is a whole number because it is the sum of number of protons and number of neutrons whereas ATOMIC mass is fractional because it is the average relative mass of its atoms as compared with mass an atom of `C - 12` ISOTOPE TAKEN as 12
Discussion
44.

Which one of the following pairs of species have the same bond order ?

Answer»

`NO^(+) and CN^(+)`
`CN^(-) and NO^(+)`
`CN^(-) and CN^(+)`
`O_(2)^(-) and CN^(-)`

Solution :`CN^(-) and NO^(+)`
In the given pair of species
NUMBER of electron in `NO^(+)` = number of electron in `CN^(-)` = 14 electrons.
So they are isoelectronic in nature.
HENCE bond order of these two species will be also si.milar which is shown below.
`N^(+) rarr sigma 1S^(2) sigma^(**) 1s^(2) sigma 2s^(2) sigma^(**) 2s^(2) sigma 2p_(z)^(2) pi 2p_(x)^(2) pi 2p_(y)^(2)`
B.O =1/2 `[N_(b) - N_(a)] `
= 1/2 [ 10 - 4]
or B.O = 3
`CN^(-) rarr sigma 1s^(2) sigma^(**) 1s^(2) sigma 2s^(2) sigma^(**) 2s^(2) pi 2p_(x)^(2) pi 2p_(y)^(2) sigma 2p_(z)^(2)`
B.O = 1/2 [ 10 - 4] or B.O = 3
Discussion
45.

What is wurtz reaction

Answer»

SOLUTION :WHENA solutionof haloalkane in dryetheris treatedwithsodiummetalhigheralkanesareproduce.thisreactionis knowas WurtzreactionForexample<BR> `CH_(3) - Br +2Na+ Br -CH_(3)overset(" dryether") (to)CH_(3)- CH_(3) + 2NaBr`
Discussion
46.

Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?

Answer»

`CO_(2)`
`N_(2)`
`CH_(4)`
HCl

Solution :Number of moles `prop(1)/("Molecular mass")`
Molecular MASSES : `CO_(2)=44,N_(2)=28,CH_(4)=16`,and `HCI =36.5`
`CO_(2)` will have lesast volume.
Discussion
47.

You are given normal boiling points and standard enthalpies of vaporization, Calendly. the entropy of vaporization of liquids listed below.

Answer»

Solution :For ETHANOL :
GIVEN :
`T_b=78.4^@C=(78.4+273)`
=351.4 K
`DeltaH_V` (ethanol)=`+42.4 "KJ MOL"^(-1)`
`DeltaS_V=(DeltaH_V)/T_b`
`DeltaS_V=(+42.4 "kJ mol"^(-1))/"351.4 K"`
`DeltaS_V=(+42.400 "J mol"^(-1))/"351.4 K"`
`DeltaS_V=+120.66 J K^(-1) "mol"^(-1)`
For Toluene :
Given :
`T_b=110.6^@C`=(110.6+273)
=383.6 K
`DeltaH_V`(toluene )=+35.2 kJ `"mol"^(-1)`
`DeltaS_V=(DeltaH_V)/T_b`
`DeltaS_V=(+35.2 "kJ mol"^(-1))/(383.6 K)`
`DeltaS_V=(+35200 J mol^(-1))/(383.6 K)`
`DeltaS_V=+91.76 J K^(-1) mol^(-1)`
Discussion
48.

Which of the following Statement are Correct ? (1) DeltaH=DeltaU+Deltan_(g)RT for chemical and phase change (2) DeltaH=DeltaU"for the reation" (3) C(s)+O_(2)(g)toCO_(2)(g) (4) Heat of formation for C_(6)H_(6)can be calculated by bond enthalpies only

Answer»

2,3
1,4
1,2,3
1,3

Answer :C
Discussion
49.

What is the action of alkali metals with hydrogen?

Answer»

Solution :ALKALI metals react with hydrogen to form ionic hydries.
`2M + H_(2) overset(Delta)(to) 2M^(+) H^(-)` (Metal hydride)
Ex: `2Li + H_(2) overset(1.073 K)(to) 2Li^(+) H^(-)` (Lithium hydride)
`2Na + H_(2) overset(673K)(to) 2Na^(+) H^(-)` (sodium hydride).
Discussion
50.

What is the percentage hydrolysis of NaCN in N/80 solution when the dissociation constant for HCN is 1.3xx10^(-9) and K_(w)=1.0xx10^(-14)

Answer»

2.48
5.26
8.2
9.6

Answer :A::C
Discussion