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 Lindlar's catalyst ? Write its uses.

Answer»

Solution :Lindlar.s catalyst : It is partially inert palladised CHARCOAL. This palladised charcoal is treated with sulphur compound or QUINOLINE like poisonous compound and made it inert. It is USED to have partial reduction of ALKYNE comopunds and form cis-alkene.
Discussion
2.

Which one of the following shows functional isomerism?

Answer»

ethylene
Propane
ethanol
`CH_(2)CI_(2)`

ANSWER :C
Discussion
3.

when a tyre is pumped up rapidly, its temperature rises, would you expect the same effect if air were an ideal gas?

Answer»

SOLUTION :146.6 pm
Given `b=0.0318Lmol^(-1)=4XX((4)/(3)pir^(3))`
`thereforer=((bxx3)/(16pi))^(1//3)`
Discussion
4.

Threeunpairedelectronof nitrogenatom can be examplainedby …

Answer»

Aufbauprinciple
Hund.srule
Pauli.sexclusionprinciple
Heisenberguncertainty

ANSWER :B
Discussion
5.

Write the oxidation number of Hg in amalgam.

Answer»

SOLUTION :Oxidation number of MERCURY in AMALGAM is ZERO.Oxidation number of each constituent in an alloy or in an amalgam is zero.
Discussion
6.

What is the hybridisation of each carbon in H_(2)C = C = CH_(2) ?

Answer»

Solution :The gross structure of allenen `(C_(3)H_(4))` is : `H_(2) underset(underset(sp^(2))(darr))overset(1)( C)= underset(underset(sp)(darr))overset(2)(C )= underset(underset(sp^(2))(darr))overset(3)(C )H_(2)`
The CARBON atom 1 and3 are `sp^(2)` hybridized since each ONE of then is joined by a double bond. Fn contrast, carbon atom 2 is sp-hybridized since it has two double bonds. Thus, the two `pi`-bonds in alkene like in acetylene are prependicular to each other are shown below.

`2p^(y) and 2p_(X)` orbitals of carbon `C_(2)` do not take part in HYBRIDIZATION on only `2p_(x)` take part so `C_(2)` has sp.
Discussion
7.

The type of overlaping not observed in the formation of ethylene molecule is

Answer»

`rho SP^(2)-sp^(2)`
`rho sp^(2)-p`
`rho sp^(2) -s`
`p^(pi)-p^(pi)`

ANSWER :B
Discussion
8.

What is meant by plasma state? Give and example.

Answer»

Solution :Gaseous state of MATTER at very high TEMPERATURE containing gaseous ions and free ELECTRON is REFERRED to as the Plasma state e.g. Lightning.
Discussion
9.

What would be the major product in the following reactions ?

Answer»


ANSWER :`(##RES_CHM_ROHR_E03_001_A01##)`
Discussion
10.

Which hybird orbitals are used by carbon atoms in the following molecules?CH_3-CH_2-OH

Answer»

SOLUTION :
Discussion
11.

Water gas is 3 times move efficient than producer gas as fuel. Why?

Answer»

SOLUTION :Both the main components of water gas are combustible. But in PRODUCER gas about two-thirds is nitrogen and is non-combustible. The calorific value of water gas is `13000 KJM^(-3)` but of producr gas is less than `4000 kJm^(-3)`?
Discussion
12.

What is osmosis?

Answer»

SOLUTION :Osmosis is a SPONTANEOUS PROCESS by which the SOLVENT molecules pass through a semipermeable MEMBRANE from a solution of lower concentration to the solution of higher concentration.
Discussion
13.

Which of the following metal reacts with cold water as well as hot water

Answer»

Ca
Sr
BA
All the above

Solution :Based on STANDARD oxidation potentials `[E_(op)^(0)]` only Ca, Sr, Ba can react WIT both cold and hot water. Be can not react with water even at high TEMPERATURE due to its low O.P than other metals
Discussion
14.

Which of the following represents zero order reaction ?

Answer»




ANSWER :A
Discussion
15.

What effect does branching of an alkane chain has on its boiling point?

Answer»

Solution :The boiling point of an alkane DECREASES with increase in branching. This is because the branching MAKES the molecule more compact and decreases its surface area. This decreases the MAGNITUDE of van DER Waals. forces existing between the molecules. On ACCOUNT of this, boiling point decreases.
Discussion
16.

What is functional group ? Give example

Answer»

SOLUTION :The functional group may be defined as an atom or group of atoms joined in a specific manner which is RESPONSIBLE for the characteristic chemical properties of the organic compounds
Examples: (i) `(-OH)` hydroxyl group i.e., `CH_(3)OH`
(ii) `(-CHO)` Aldehyde groupi.e., `CH_(3)CHO`
(III) `(-COOH)` Carboxylic acid group `CH_(3)COOH`

Some IMPORTANT functional group are of under
(a) Carbon -carbon multiple bond containing functional group:

(b) Atoms other then carbon CONNECTED with carbon such functional group:

Discussion
17.

What is the compressibility facto (Z) for 0.02 mole of a van der Waal's gas at pressure of 0.1 atm. Assume the size of gas molecules is neligible. Given : RT = 20 L. atm "mol^(-1) and alpha = 1000 atm L^(2) "mol^(-2)

Answer»

2
1
0.02 
0.5 

Solution :`[0.1 + (100 + (0.02)^2)/(V^2)] = 20 XX 0.02`
`0.1 V^2 - 0.4 V + 0.4 = 0`.
`= V^2 - 4V + 4 = 0 implies V = 2L`
`Z = (PV)/(nRT) = (0.1 xx 2)/(20 xx 0.02) = 0.5`.
Discussion
18.

What is the difference between the terms orbit and orbital ?

Answer»

SOLUTION :The DIFFERENCE between ORBIT and ORBITAL are as below
Discussion
19.

Which one of the following is an isobar of ""_(6)C^(14) ?

Answer»

`""_(6)C^(13)`
`""_(6)C^(12)`
`""_(7)C^(14)`
`""_(7)N^(15)`

Answer :C
Discussion
20.

Which one of the following is called benzylchloride?

Answer»

`C_(6)H_(5)CH_(2)Cl`
`C_(6)H_(5)CHCl_(2)`
`C_(6)H_(5)"CCl"_(3)`
`C_(6)H_(5)Cl`

Answer :A
Discussion
21.

Which of the following statements is/are not correct ?

Answer»

Aluminium wire is used in Beilstein test
NITROGEN gas is quantitatively estimated in Dumas method
In Kjeldahl's method, organic COMPOUND is reacted with conc, `H_(2)SO_(4).K_(2)SO_(4)` is also ADDED.
All organic compounds contain both C and H.

Solution :(c ) Not applicable to PYRIDINE, compounds containing N-N and N-O bonds, atc.
(d) Estimated magnesium pyrrophosphate `(Mg_(2)P_(2)O_(7))`.
Discussion
22.

The sodium fusion extract of an organic compound on acidification with acetic and addition of lead acetate solution gives a back precipitate. The organic compound contains :

Answer»

NITROGEN
HALOGEN
SULPHUR
Phosphorus

Answer :C
Discussion
23.

What is the basic theme of orgainisation in the periodic table?

Answer»

Solution :It is to simplify and systematise the study of the PROPERTIES of all the elements and MILLIONS of their compounds. On the basis of similarities in chemical properties, the various elements have now been divided into different groups. This has MADE the study simple because the properties of elements are now STUDIED in the form ofagroups rather than INDIVIDUALLY.
Discussion
24.

The successive ionisation enthalpies of an element M are 5.98, 18.82, 28.44, 119.96, 153.77, ...... e V atom What is the formula of chloride of M?

Answer»

Solution :Observing the `I_1, I_2, I_3, I_4, I_5`, .... it is NOTICED that there is a sudden jump from `I_3` and `I_4`
This observation gives the idea that the element has 3 ELECTRONS in the OUTER most shell.
`M^(3+)` state is STABLE and valency is 3.
Formula of CHLORIDE of `M`is `MCI_3`
Discussion
25.

Which of the following is the ore name related to 'Mg'

Answer»

Brucite
ANHYDRITE
Baryta
None of these

Solution :Brucite `mg(OH)_(2)`
Anhydrite `CaSO4`
Baryta `BaSO_(4)`
Discussion
26.

Which of thefollowing is not an air pollutant?

Answer»

`N_2`
`N_2O`
NO
CO

Answer :A
Discussion
27.

What is the maximum number of electrons in a element possible ?

Answer»

SOLUTION :DOUBLE NUMBER of ELECTRONS are PRESENT than sub-orbitals in an element.
Discussion
28.

Which one of the following compounds, decolourises cold alkaline potassium permanganate solution?

Answer»

`C_(2)H_(6)`
`C_(2)H_(5)Cl` and aq. `KOH//Delta`
`C_(2)H_(4)`
`C_(2)H_(5)OCH_(3)`

ANSWER :C
Discussion
29.

Two containers, X and Y at 300K and 350K with water vapour pressures 22 mm and 40 mm respectively are connected, initially closed with a valve. If the valves opened,

Answer»

the FINAL pressure in each container is 31 mm
the final pressure in each container is 40 mm
Mass of `H_2O(L)` in X increases
Mass of `H_2O(l)` in Y decreases

Solution :Gas moves from Y to X to BALANCE pressure
In container `Y, l to G` to maintain same V.P
In container `X, g to l` to maintain same V.P .
Discussion
30.

Total number of lone pairs of electrons in I_(3)^(-) ion is

Answer»

3
6
9
12

Solution :STRUCTURE of `I_(3)^(-)` ion is as follows :

THEREFORE, total number of lone pairs of ELECTRONS in
`I_(3)^(-)` ion is 9.
Discussion
31.

Which of the following salt is not produce from the solvey ammonia soda process ?

Answer»

`Na_(2)CO_(3)`
`NaHCO_(3)`
`KHCO_(3)`
None

ANSWER :C
Discussion
32.

Which physical property is lower for alkaline earth metals as compared to alkali metals of the same period ?

Answer»

Hardness
Melting point
Electropositivity
Ionisation potential

Answer :C
Discussion
33.

Which of the following phenol is strongest acid

Answer»




Solution :Presence of `-NO_(2)` group at o-or p-positions to `-OH` group make it is stronger acid than when `-NO_(2)` groups is at m-position. This 'B' and 'D' are stronger ACIDS than 'A' and 'C'. In 'D' the `NO_(2)` groups is flasked by two `-CH_(3)` groups which push the `NO_(2)` group out of plane of the BENZENE ring. As a result of this steric hinderance, the electron withdrawing resonance effect of the `-NO_(2)` group will be reduced and as such 'D' will be a WEAKER acid than 'B'. Therefore 'B' is the STRONGEST acid.
Discussion
34.

Which is the function of sodium-potasssium pump?

Answer»

MAINTENANCE of ion balance
Used in NERVE IMPULSE conduction
Transmitting nerve signals
Regulates the BLOOD level

Answer :c
Discussion
35.

Which of the following is (are) not an air pollutant (s)

Answer»

CO
`SO_(2)`
NO
`N_(2)`

ANSWER :A::B::C
Discussion
36.

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because:

Answer»

alpha PARTICLES are MUCH heavier than electrons
alpha particles are positively charged
most PART of the ATOM is EMPTY space
alpha particles move with very high velocity.

Answer :C
Discussion
37.

What is the condition spontaneity in terms of free energy change?

Answer»

SOLUTION :(i)If`DeltaG`is negative, process is SPONTANEOUS.
(II)If `DeltaG` is positive, process is non-spontaneous.
(iii) If `DeltaG=0`, the process is in equilibrium
Discussion
38.

Which of the following combination can be used to synthesise isopropyl alcohol ?

Answer»

`CH_(3)MgI` and `CH_(3)COCH_(3)`
`CH_(3)MgI` and `C_(2)H_(5)OH`
`CH_(3)MgI` and `CH_(3)COOC_(2)H_(5)`
`CH_(3)MgI` and `HCOOC_(2)H_(5)`

SOLUTION :
Discussion
39.

Which of the following electronic configura tions represent the most metallic element ?

Answer»

`[N E]3s^2 3p^5`
`[XE]6s^1`
`[Xe]6s^2`
`[Xe]4f^14 5d^10 6s^2 6p^1`

ANSWER :B
Discussion
40.

Two immiscible liquid present in a bottle can be separated by:

Answer»

SEPARATING funnel
Steam distillation
Fractional distillation
Chromatography

Solution :Separating funnel is USED to separate TWO IMMISCIBLE liquids
Discussion
41.

The rice is cooked earlier in pressure cooker because

Answer»

boiling point increases with INCREASING pressure
boiling point decreases with increasing pressure
Internal energy is not lost while COOKING in pressure cooker
EXTRA pressure of pressure cooker soflens the rice

Answer :A
Discussion
42.

Write relation of value of Q_c and K_c and direction of reaction.

Answer»

Solution :`Q_c LT K_c`, So REACTION will be forward, Products is increase.
`Q_c gt K_c`, So, reaction will be REVERSE (Right to Left ) . Products is DECREASE.
`Q_c=K_c`, So, reaction will be in equilibrium. The reaction is not forward or reverse.
Discussion
43.

What is sp^(2) hybridization ? Give characteristics of it.

Answer»

Solution :Definition: ONE ns and THREE np orbitals of an atom having less difference in energy combine and form four equivalent orbitals having similar shape is called `sp^(3)` hybridization and form orbitals are called `sp^(3)` hybridization and form orbitals are called `sp^(3)` hybrid orbitals.
Characteristics :
there is 25% s-character and 75% p-character in each sp hybrid orbital
The four `sp^(3)` hybrid orbitals so formed are directed towards the four corners of tetrahedron. The angle between `sp^(3)` hybrid orbital is `109^(@)`28..

ll four `sp^(3)` hybrid orbitals OVERLAP with s, p or hybrid orbitals of other atom on inter molar AXIS sigma bond arrange at `109.5^(@)` in three dimension & remain tetrahedral in shell.
Discussion
44.

Which of the following is are resolvable:

Answer»




Solution :Optically active COMPOUND will be resolvable.
Resolution is aprocess bywe separate entionmers and we know that entiomers are individually active so CHEAK POS and COS .
Discussion
45.

Why are solids incompressible ?

Answer»


ANSWER :The constituent particeles of a solid are very closely PACKED. The inter- particle DISTANCES are so small that if wwe try to being them closer, repulsions start between their ELECTRON CLOUDS. Hence, they are incompopressible .
Discussion
46.

What is the value of Dipole moment (mu) for trans-but-2-ene ?

Answer»

2.5 D
2.0 D
0.00D
0.33 D

Answer :C
Discussion
47.

Though the two ends of a glass tube of length 200 cm, hydrogen chlorine gas and ammonia are allowed to enter. At what distance ammonium chloride will first appear ?

Answer»

Solution :By Graham's law of diffusion, `(r_(NH_(3)))/(r_(HCl))=sqrt((M_(HCl))/(M_(NH_(3))))=sqrt((36.5)/(17))=sqrt(2.147)=1.465`.
Thus, `NH_(3)` travels 1.465 times FASTER than HCl. In other words, `NH_(3)` will travel 1.465 cm in the same time which HCl travels 1 cm.
LENGTH of the tube =200 cm.
`:. " Distance TRAVELLED in the tube by "=(1.465)/(1.465+1)xx200=118.9 cm`
Thus, `NH_(Cl)` will first appear at a distance of 118.9 cm from `NH_(3)` end 81.1 cm from HCl end.
Discussion
48.

Which one of the following has tetrahedral shape?

Answer»

`NH_(4)^(+)`
`CIO_(4)^(-)`
HCHO
`CH_(4)`

Solution :HCHO
Discussion
49.

Which of the following is not Lewis acid ?

Answer»

`AlCl_3`
`SnCl_4`
`BCl_3`
`BeCl_2`

ANSWER :B
Discussion
50.

Which of the following can be oxidized by H_(2)O_(2) ?

Answer»

KI
`KMnO_(2)`
`F_(2)`
`Na_(2)SO_(3)`

SOLUTION :`F_(2)` can not be oxidized by `H_(2)O_(2)`
Discussion