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 following is sodalime ?

Answer»

KOH, CaO
`Ca(OH)_(2), NAOH`
`H_(2)O, NaOH`
`NaOH, CaO`

ANSWER :D
Discussion
2.

Two glass bulbs A (of 100 mL capacity), and B (of 150mL capacity) containing same gas are connected by a small tube of negligible volume. At particular temperature the pressure to A was found to be 20 times more than that in bulb B. the stopcock is opened without changing the temperature. the pressure in A will:

Answer»

drop by 75%
drop by 57%
drop by 25%
will remain same

Answer :b
Discussion
3.

Which alkyne will give 3- Ethyl hexane on catalytic hydrogenation ?

Answer»




All of these

Solution :All ALKYNE on catalylic HYDROGENATION give 3 -ETHYL HEXANE
Discussion
4.

Write the structural formula and carbon skeleton formula for all possible chain isomers of C_(6)H_(14) (Hexane)

Answer»

SOLUTION :`COH_(14)` has FIVE POSSIBLE ISOMERIC
Discussion
5.

The smog is essentially caused by the presence of

Answer»

`O_2` and `O_3`
`O_2` and `N_2`
OXIDES of SULPHUR and NITROGEN
`O_3` and `N_2`

ANSWER :C
Discussion
6.

The strongest acid amongst the following compounds is :

Answer»

`CH_(3)COOH`
`HCOOH`
`CH_(3)CH_(2)CH(Cl)CO_(2)H`
`ClCH_(2)CH_(2)CH_(2)COOH`

Answer :C
Discussion
7.

The value of log_(10)K for a reaction A hArr B is ( Given :Delta _(r) H_(298K)^(@)= -54.07kJmol^(-1),Delta_(r)S_(298K)^(@) = 10J K^(-1)mol^(-1) andR = 8.314 JK^(-1) mol^(-1), 2.303 xx 8.314 xx 298 K = 5705)

Answer»

5
10
95
100

Solution :`DeltaG^(@) =DELTAH^(@) - T DELTA S^(@)= - 2.303 RT log _(10) K`
`:.-2.303 RT log_(10) K= DeltaH ^(@)- T DeltaS^(@)`
i.e., `-2.303 xx 8.314 xx 298 xx log_(10)K`
`=- 54.07xx 1000- 298 xx 10`
`-5705 log_(10)K =- 54070 - 2980 = - 57050`
or `log_(10)K =10`
Discussion
8.

Which of the following decomposes steam to form dioxide and dihydrogen gas ?

Answer»

Sn
C
Si
Ge

Answer :A
Discussion
9.

Which of the following statements about water is false?

Answer»

WATER is oxidized to oxygen during bonding in the condensed phase
Water can act both as an acid and as a base.
There is extensive inframolecular hydrogen bonding in the condensed phase
Ice FORMED by heavy water SINKS in normal water.

Solution :(c ) In the condensed phase, there is extensive intermolcular hydrogen bonding present in `H_(2)O` molecules in water.
Discussion
10.

Write the structure of inorganic benzene.

Answer»

SOLUTION :
Discussion
11.

What happens when Al treated with dilute NaOH

Answer»


ANSWER :`2Al+2NaOH+6H_2Orarr2Na^+(AL(OH)_4)-+3H_2`
Discussion
12.

Which solution is filled in salt bridge ?

Answer»

SOLUTION :Solution of KCl or `NH_(4)CO_(3)` is FILLED in SALT bridge.
Discussion
13.

Two gas bulbs A and B are connected by a tube having a stopcock. Bulb A has a valume of 100 mL and contains hydrogen. After opening the gas from A to the evacuated bulb B, the pressure falls down by 40%. The volume (mL) of B must be

Answer»

75
150
125
200

Solution :APPLYING BOYLE's LAW
`P_(A)V_(A)=(0.40P_(A))(V_(A)+V_(B))`
`P_(A)xx100=0.40P_(A)(100+V_(B))`
or `100=0.4(100+V_(B))`
or `100+V_(B)=250`
or `V_(B)=150 mL`.
Discussion
14.

What is thebasisof classification ofelementsin thelongformof the periodictable ?

Answer»

SOLUTION :Physical and CHEMICAL PROPERTIESOF the ELEMENTSARE periodicfunction of theiratomic NUMBERS.
Discussion
15.

What are X and Y respectively in the following reaction? Z - product overset(Y)larr 2-Butyne overset(x)rarr E-product

Answer»

`Na//NH_(3(liq))andPd//BaSO_(4)+H_(2)`
`Ni//140^(@)CandPd//BaSO_(4)+H_(2)`
`Ni//140^(@)CandNa//NH_(3(liq))`
`Pd//BaSO_(4)+H_(2)andNa//NH_(3(aq))`

ANSWER :A
Discussion
16.

What is called Bond Langth ? Name the techniques through which the length of a bond can be determined.

Answer»

Solution :The distance between the nuclei of the two COVALENTLY bonded ATOMS is CALLED bond length.
The length of a bond can be determined by SPECTROSCOPIC, x-ray DIFFRACTION and electron-diffraction techniques
Discussion
17.

What is compressbility factor ?

Answer»

SOLUTION :The deviattion of real gaes from ideal behaviour is measured in terms of a ratio of PV to nRT. This is TERMED as compressbility FACTOR.
`Z=(PV)/(nRT)`
For ideal gases PV=nRT, HENCE the compressibility factor, Z=1 at all TEMPERATURES and pressures.
Discussion
18.

What is the freezing point of solution containing 3g of a non-volatile solute in 20g of water. Freezing point of pure water is 273K, K_(f) of water = 1.86 Kkg/mol. Molar mass of solute is 300 g/mol. T^(@)-T=K_(f)m

Answer»

Solution :`m=(W_(2))/(M_(2)W_(1))`
`=(3)/(300xx20)xx1000`
`T^(@)-T=(1.86xx3xx1000)/(300xx20)=0.93K`
`T=273K-0.93K=272.07K`
`THEREFORE" Freezing point of the solution = 272.07 K"`
Discussion
19.

What is neutral oxide ? Give its example.

Answer»

SOLUTION :Which oxide do not REACT with acid or BASE such oxide are known as neutral oxides. Example : `CO, NO, N_(2)O`.
Discussion
20.

What is the minimum quantity (in grams) of methyl iodide required for preparing one mole of ethane by Wurtz reaction ? (Atomic weight of iodine = 127)

Answer»

142
568
326
284

Answer :D
Discussion
21.

Which of the following is a sink for CO ?

Answer»

Haemoglobin
Microorganism PRESENT in the SOIL
Oceans
Plants

Solution :MICROORGANISMS present in the soil act as a sink for CO.
Discussion
22.

Y is a gas which disproporionates on passing through hot and concentrated solution of X.Z is a gas which can also be obtained by the action of solution of X on zinc In the reaction of Y with hot and concentrated solution of X , the equivalent weight of Y is "__" (Molecular weight of Y is M)

Answer»


ANSWER :C
Discussion
23.

Water reacts with fluorine liberating _________ gas.

Answer»

DIHYDROGEN
DIOXYGEN
HYDROGEN FLUORIDE
hydrogen peroxide

Answer :B
Discussion
24.

Which does not exist ?

Answer»

`[C Cl_6]^(2-)`
`[SI Cl_6]^(2-)`
`[Ge F_6]^(2-)`
`[Sn Cl_6]^(2-)`

SOLUTION :`[C Cl_6]^(2-)`
Discussion
25.

What is the maximum number of electrons which can be accommodated in a shell for which the highest principal quantum number value is 4

Answer»

10
18
32
54

Solution :MAXIMUM NUMBER of ELECTRONS `=2n^2` (where n=4) =`2xx4^2=32`
Discussion
26.

Y is a gas which disproporionates on passing through hot and concentrated solution of X.Z is a gas which can also be obtained by the action of solution of X on zinc Solution on X on treatment with the following forms an unstable hydroxide precipitate which decomposes to given an oxide precipitate :

Answer»

`HgCl_(2)`
`ZnSO_(4)`
`FeSO_(4)`
`CuSO_(4)`

Answer :A
Discussion
27.

What are boranes ?

Answer»

Solution :Stablecovalent boronhydrides LIKE `B_(2)H_(6), B_(4)H_(10), B_(5)H_(9)` ETC. on analogy with alkanes are called boranes.
Discussion
28.

What do you mean by dehydrohalogenation ?

Answer»

Solution :Dehydrohalogenation means formation of alkene from alkyl HALIDE compounds by REMOVAL of HALOGEN ACIDS.
Discussion
29.

The total number of electrons in the carbon atom of methyl free radical is

Answer»

SIX
SEVEN
Eight
Nine

Solution : 6 electrons of CARBON and 3 electrons of THREE HYDROGEN atoms
Discussion
30.

Why can't we overcome the uncertainty predicted by Heisenberg's principle by building more precise device to reduce the error in the measurement below the h//4pi limit ?

Answer»

SOLUTION :The principle is not due to limitation of the measuring DEVICES. It is on account of the fact that microscopic particles cannot be SEEN even under a microscopic. Their position and velocity cannot be measured without disturbing them by HITTING with photons.
Discussion
31.

What isatomicorbital ?

Answer»

SOLUTION :the aroundthe nucleuswhereprobabilityso findelectronis maximumis calledatomicorbitalit isgiven BYW WAVEFUNCTION.
Discussion
32.

The size of ionic species is correctly given in the orders-

Answer»

`Li^(+) GT MG^(2+) gt Be^(2+)`
`Na^(+) gt Mg^(2+) gt Si^(4+)`
`Si^(4+) gt Mg^(2+)gt Na^(+)`
`Mg^(2+) gt Li^(+) gt Na^(+)`

Answer :A::C
Discussion
33.

When the same amount of zinc is treated with excess if H_2SO_4 and with excess if NaOH,the ratio of the volumes of H_2 evolved , is

Answer»

`1:1`
`1:2`
`2:1`
`9:4`

Solution :When the same AMOUNT of METAL is TREATED with acids or bases same amount of Hydrogen was PRODUCED, according to EQUIVALENT concept.
Discussion
34.

Which of the following has the lowest melting point ?

Answer»

NaCI
NaF
NaBr
Nal

Solution :Lodides have LOW M.P
Discussion
35.

Which of th following ions is more stable ? Use resonane to explain your answer .

Answer»

SOLUTION :
`square ` (A) is morre STABLE then (B) .
` square ` CARBOCATION (A) is more planar and is stabilised by resonance .
` square ` Carbocation (B) is non-planar and does not undergo resonance .
` square ` Double bond inside the RING is more stable then outside the ring .
Discussion
36.

Which of the following exists as covalent crystals in the solid state ?

Answer»

Phosphorus
Iodine
SILICON
Sulphur

SOLUTION :Silicon has covalent NETWORK structure wheraes sulphur ` (S_(8))` , phosphorus `(P_(4))` and iodine `(I_(2))` are molecular solids.
Discussion
37.

When the temperature of a gas is raised from 27^@C to 927^@C, its RMS velocity

Answer»

GETS HALVED
gets doubled
remains same
becomes ` SQRT((927 )/( 27))` times

Answer :B
Discussion
38.

Which of the following has an optical isomer ?

Answer»

Si
SiC
`SiO_(2)`
`SiH_(4)`

SOLUTION :`SiO_(2)` is used for makingoptical instruments.
Discussion
39.

The solubility product of Al(OH)_(3)is 2.7xx10^(-11). Calculate its solubility in g L^(-1)and also find out pH of this solution . (Atomic mass of Al = 27 u ).

Answer»

Solution :Suppose the solubility isS mol `L^(-1)`. Then
`{:(Al(OH)_(3),hArr,Al^(3+),+,3OH^(-),,),(,,S,,3 S,,):}`
`K_(sp)= S xx (3 s)^(3) = 27 S^(4)`
`:. 27S^(4)=2.7xx10^(-11) or S^(4) = 10^(-12) or S=10^(-3) ` mol `L^(-1)`
Molar MASS of `Al(OH)_(3) ` in g `L^(-1) = 10^(-3)xx78=7.8xx10^(-2) g L^(-1)`
`[OH^(-)]=3 S = 3 xx 10^(-3) ` mol `L^(-1)`
`:. pOH = - log (3xx10^(-3))=3-0.4771=3.5229`
pH = 14 - 2.5229 = 11.4771.
Discussion
40.

What is value of Z of ideal gas or real gas ?

Answer»

SOLUTION :Z = 1 Ideal gas, `Z GT 1` or `Z lt 1` Real gas.
Discussion
41.

Which of the following statements are (T) and which are false (F) ? (i) Stock notation nomenclature is used for all metallic compounds. (ii) The oxidation state of fluorine (F) is always -1 in its compounds (iii) CrO_(5), possesses peroxy rings, where oxidation number of Cr is +6 The oxidation number of .O. atom in HOF and HO_(2)^(-) is 0 and -1 respectively

Answer»

FTFT
FTTT
FTTT
FTTF

Solution :(i) Stock notation method is for metals having variable oxidation STATES.
(ii) F is most negative element and ___ (F) always it is (- 1) in its compounds __ (T)
(iii)
`CrO_(5)` has two peroxy bonds -O-O- and the oxygen atoms have -1 oxidation NUMBER.
`(CR)+2(O-O)+(O)=0`
`thereforex+2(-2)+(-2)=0`
`thereforex=+6`
`Cr" of "CrO_(5)" is "+6" "...(T)`
(iv)
Discussion
42.

Which of the following statements are not correct ?

Answer»

NaCl being an ionic compound is a good
conductor of elecricity in the solid state
In canonical structures , there is a DIFFERENCE in
the arrangement of atoms
Hybrid orbitals FORM stronger bonds than pure orbitals
VSEPR THEORY can explain the square planar
GEOMETRY o f`XeF_(4)`.

Solution :Only (a) and (B) are not correct .
Discussion
43.

What is the following compounds (Give equations for the reactions)?What is the effect of heat on the following compounds (Give equations for the reactions)? (1) CaCO_(3) , (ii) CaSO_(4).2H_(2)O

Answer»

Solution :`CaCOoverset("heat")to CaO + CO_(2)`
(ii) `CaSO_(4).2HO_(2)Ooverset("heat")tounderset("plaster")UNDERSET("Dead BURNT")(CaSO_(4)) + 2H_(2)O`
Discussion
44.

Which one of the following is correct order of stability of alkyl free radicals?

Answer»

`""^(.)C(CH_(3))_(3)GT""^(.)CH(CH_(3))_(2)gt""^(.)CH_gt""^(.)CH_(3)`
`""^(.)CH_(3) gt ""^(.)CH_(2)CH_(3) gt ""^(.)CH(CH_(3))_(2) gt""^(.)C(CH_(3))_(3)`
`""^(.)CH(CH_(3))_(2) gt ""^(.)CH_(3) gt ""^(.)CH_(2)CH_(3) gt ""^(.)C(CH_(3))_(3)`
`""^(.)CH_(2)CH_(3) gt ""^(.)CH(CH_(3))_(2) gt ""^(.)C(CH_(3))_(3) gt""^(.)CH_(3)`

ANSWER :A
Discussion
45.

What happens when excess of CO_(2) reacts with calcium carbonate?

Answer»

Solution :`CaCO_(3) + CO_(2) + H_(2)O to CA(HCO_(3))_(2)` (Calcium bi-carbonate)
Discussion
46.

What will be the molarity of the solution in which 0.365 g of HCl gas is dissolved in 100 mL of solution ?

Answer»

2 M
0.2 M
1 M
0.1 M

SOLUTION :No. of moles in 0.365g of HCl `=(0.365)/(36.5)=0.01`
VOLUME of solution in L `=100/1000=0.1L`
MOLARITY `=n/(V("in L"))=(0.01)/(0.1)=0.1M`
Discussion
47.

Write the structure of 3-methyl-pentanal.

Answer»

SOLUTION :`H_(3)C-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CHO`
Discussion
48.

Which of the following are correct for the addition of X_2 on alkene?

Answer»

Reaction involves cyclic halonium ION as INTERMEDIATE
Reaction involves CARBOCATION intermediate
Addition is anti addition reaction
Trans ALKENE(symmetrical) gives MESO product

Solution :Reaction involves carbocation intermediate is not formed.
Discussion
49.

Two electrons of K-shell can be distinguished by

Answer»

spin quantum number.
azimuthal quantum number.
PRINCIPAL quantum number
MAGNETIC quantum number

Solution :K SHELL means n = 1 It has only one, Is orbital. Is has four quantum no. as n = Principal quantum number = 1 1 = Angular momentum quantum number = 0 m = Magnetic momentum quantum number = `+1/2,-1/2`
Discussion
50.

What will be the volume occupied by 1 mole atom of a (i) monoatomic gas, and (ii) diatomic gas at NTP?

Answer»

SOLUTION :For monoatomic GASES,
1 mole atom occupies 22.4 litres at NTP, and for DIATOMIC gases,
1 mole atom occupies 11.2 litres at NTP, as 1 mole of `O_(2)` contains 2 MOLES of O.
Discussion