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 are correct statement ?

Answer»

`CH_3cOONH_4` have greater degree of hydrolysis in 0.2M solution in comparison of 0.4 M solution
Anion have LESSER basic strength than `OH^(-) ` , does not undergo hydrolysis in comparison of `HCOO^(-) ` when their salt solution have EQUAL concentration
The `CH_3 COO^(-) `have greater degree of hydrolysis in compreson of `HCOO^(-) ` when their salt solution have equal concentration
`SO_4^(2-) ` does hydrolysisbut `HSO_4^(-) ` does not undergo hydrolysis

Solution :Degree of hydrolysis of salt of W.A and W.B doesnot depend on conc.
(b)anions come fromacids which are more acidic than `H_2O` undergo hydrolysis.
(C ) AMONG two acids , anioncomes fromweaker acid (LESS `K_a) ` undergo more hydrolysis.
(d)` HSO_4^(-) `comes fromstronger acid `H_2SO_4` . so it does not undergo hydrolysis.
Discussion
2.

To decrease the volume of a gas by 5 tiumes at constant temperature, pressure should be …………. .

Answer»

DECREASED by 5 TIMES
increased by 5 times
kept CONSTANT
increased by 50%

Answer :B
Discussion
3.

What are isoelectronic ions ? Give examples.

Answer»

SOLUTION :Ions of different elements having the same number of electrons are called iso electronic ions.
De- Broglie combined the following two equations of ENERGY of which one represents wave CHARACTER(hu)and the other represents the particle NATURE `(mc^(2))` .
Discussion
4.

Which metal is protected by a layer of its own oxide?

Answer»

AL
Ag
Au
Fe

Solution :Al
Discussion
5.

Uncertainity in the position of an electron (mass = 9.1 xx 10^(-31) kg) moving with a velocity 300 ms^(-1) accurate upto 0.001% will be (h = 6.63 xx 10^(-34) Js)

Answer»


ANSWER :`1.9 XX 10^(-2)m`
Discussion
6.

What will be the strength of 20 vol of H_(2)O_(2) in terms of gram per litre?

Answer»

`60.71 GL^(-1)`
`5.6 gL^(-1)`
`30.62 gL^(-1)`
`17 gL^(-1)`

Solution :20 vol of `H_(2)O_(2)` means :
1 L of this `H_(2)O_(2)` will give 20 L of oxygen at sTP.
`underset(2xx34)(2H_(2)O_(2))to underset(22.4" L at STP")(O_(2))+H_(2)O`
22.4 L of `O_(2)` is PRODUCED from 68 g of `H_(2)O_(2)`
20 L of `O_(2)` is produced from `=(68xx20)/(22.4)=60.71 g L^(-1)`of `H_(2)O_(2)`.
Discussion
7.

Which of the following is a reducing agent and undergoes hydrolysis ?

Answer»

`CH_(4)`
`C_(2)H_(6)`
`C_(3)H_(8)`
`SiH_(4)`

Answer :D
Discussion
8.

Which of the following is an example for polyhalo compounds?

Answer»

Vinyl IODIDE
Chlorobenzene
ALLYL CHLORIDE
CHLOROFORM

Solution :Chloroform
Discussion
9.

The salt which is added to table salt to keep it dry and free flowing is -

Answer»

KCL
`Ca_3(PO_4)_2`
`KI`
`Na_3PO_4`

ANSWER :B
Discussion
10.

Which one of the following pairs of atoms/ions have identical ground state configuration ?

Answer»

`Li^(+)` and `He^(+)`
`CL^(-)` and Ar
Na and K
`F^(+)` and Ne

Answer :B
Discussion
11.

When HCl gas is passed through a saturated solution of common salt, pure NaCl is precipitated because

Answer»

HCL is HIGHLY ionised in solution
HCl is highly soluble in WATER
The solubility product of NaCl is LOWERED by HCl
The ionic product of `[Na^(+) ] [Cl^(-) ]` EXCEEDS the solubility product of NaCl

Solution :If ` IP gt`Ksp pptn occurs
Discussion
12.

Which one is not included in branch of chemistry ?

Answer»

ORGANIC
industrial
Biochemistry
NATURAL chemistry

Answer :A::C::D
Discussion
13.

What weight of slaked lime will be required to decompose completely 4 grams ammonium chloride

Answer»

`2.77g`
`3.5g`
`5.5g`
`5.44g`

SOLUTION :`UNDERSET(2xx53.5g)(2NH_(4)Cl)+underset(74g)(Ca(OH)_(2))rarrCaCl_(2)+2NH_(3)+2H_(2)O`
Discussion
14.

The undesirable material that enters into the environment by natural source or due to human activity is called _______

Answer»


ANSWER :POLLUTANT
Discussion
15.

Why are potassium and caesium rather than lithium used in photoelectric cells ?

Answer»

Solution :The IONISATION enthalpy of lithium `(520 kJ mol^(-1))` is much higher than those of POTASSIUM `(419 kJ mol^(-1))`and caesium `(376 kJ mol^(-1))`. Due to high ionisation enthalpy, lithium does not emit electrons on EXPOSURE to light. On the other hand, potassium and caesium do so. Therefore, K and CS rather than Li are used in photoelectric cells.
Discussion
16.

Which of the following cannot give precipitate with cuprous ammonium chloride?

Answer»

`CH_(3)-C-=C-CH_(3)`
`CH_(3)-C-=CH`
`HC-=CH`
`CH_(3)-CH_(2)-C-=CH`

ANSWER :A
Discussion
17.

Whenphenol reqacts with Zn dust under dry distillationconditions it gives ……………….

Answer»

SOLUTION :BENZENE
Discussion
18.

Which of the following compound is non aromatic?

Answer»




ANSWER :B
Discussion
19.

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3Ca(PO_4)2. Ca(OH)_2] to :

Answer»

`[CaF_2]`
`[3CaF_2^* CA(OH)_2]`
`[3Ca_3 (PO_4)_2 * CaF_2]`
`[3(Ca(OH)_2]* CaF_2]`

Solution :F is NEEDED to make the teeth enamel harder . Which is POSSIBLE by converting `[3Ca_3 (PO_4)_2 . Ca(OH)_2]` into `[3Ca_3 (PO_4)_2 CaF_2]`
Discussion
20.

Which of the following is not an electromagnetic radiation ?

Answer»

Gamma RAYS 
ALPHA rays 
RADIO waves 
X-rays 

Answer :B
Discussion
21.

Which of the following cannot be regarded as molecular solid ?

Answer»

SIC ( Silicon carbide )
AIN
DIAMOND
`I_(2)`

Solution :SiC, AIN and diamond are covalent NETWORK solids.
Discussion
22.

What indicate these is solid dash model of organic molecule?

Answer»

SOLUTION :In these FORMULA, the solid WEDGE is used to indicate a BOND PROJECTING out of the plane of paper, towards the observer. The dashed wedge is used to depict the bond projecting out of the plane of the paper and away from the observer
Discussion
23.

Which is the IUPAC name of

Answer»

4-ethyl-2-methylaniline
4-amino-3-methylbenezene
2-amino-5-ethyltoluene
1-amino-4-ethyl-2-methylebenzene

Answer :A
Discussion
24.

What is the effect on equilibrium and on the value of equilibrium constant on adding catalyst ?

Answer»

Solution :No EFFECT on EQUILIBRIUM constant. However, forward and backward reactions become faster to the same EXTENT and equilibrium is attained QUICKLY.
Discussion
25.

There is change in volume of an ideal gas when pressure is changed at constant temperature. The change in free energy associated with this can be calculated by which of the following equation ?

Answer»

`Delta G = RT "In" (P_2)/( P_1)`
`Delta G = -2.303 RT log ""(P_2)/(P_1)`
`Delta G = NRT "In" (V_2)/( V_1)`
`Delta G = nRT "In" (P_2)/( P_1)`

Answer :D
Discussion
26.

Which type of reaction occurred between H_(2)SO_(4)-HNO_(3) in nitration ?

Answer»

Solution :Acid-BASE TYPE of reaction in which `H_(2)SO_(4)` protn donor acid and `HNO_(3)` PROTON acceptor base.
Discussion
27.

When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule is

Answer»

GREATER than that of SEPARATE atoms
equal to that of separate atoms
lower than that of separate atoms
None of these

Answer :C
Discussion
28.

What is the characteristic of R_(f) value ?

Answer»

Solution :In EVERY compound, the `R_(F)` VALUE is definite and constant. So, the `R_(f)` value give identification of compound LIKE other consant value
Discussion
29.

Which of thefollowingelementswill gainoneelectronmore readily comparison to other elements of theirgroup ?

Answer»

S (g )
Na ( g)
O ( g)
C1( g)

Solution :Chlorinehas thehighesttendency to gain one electronbecause by doing goit ACQUIRES the stableelectronic configurationof the nearest noblegas i.e.,argon. S andO BELONG to group16 but thesize ofis muchsmaller thant that of s. Asresultwhen an electron is addedto them the electron - electronrepulsioninthe smaller 2P- subshellof O are comparativelystronger than thosepresent in thebigger3p- subshellofS. ThereforeS hasa highertendencyto gainan electron tham ONa on theother handhas onlyoneelectronin the valenceshelland hencehas astrongtendencyto loseratherthan gainone electron. Thusoptions( a) and(d ) arecorrect.
Discussion
30.

Write the bond -line formula for CH_(3)underset(CH_(3))underset(|)(CHCH_(2))CH_(2)CH_(2)OH

Answer»

Solution :Firstfor the sake of practice , we outline the CARBON skeleton , including the OH group ,as follows :

Then we write the bond -LINE formula as
As you gain EXPERIENCE you will likely skip the intermediate STEPS shown above and proceed directly to writing bond - line formulas .
Discussion
31.

Which of these elements have almost same electronegativity? (i) C,I (ii) P, H (iii) N, Cl (iv) Br,S

Answer»


Answer :Phosphorous and HYDROGEN have almost similar ELECTRONEGATIVITY values of 2.1. Similarly CARBON and iodine have a VALUE of 2.5; Nitrogen and CHLORINE have a value of 3.0 and Bromine, Sulphur have a value of 2.8.
Discussion
32.

Write short notes on ortho, para directors in aromatic electrophillic substitution reactions.

Answer»

Solution :`{:(A,-,CH_(2)=CH_(2),-,,"ETHENE"),(B,-,UNDERSET(Cl)underset(|)(C )H_(2)-underset(Cl)underset(|)(C )H_(2),-,1,2-"dichloro ethane"),(C,-,HCHO,,-,"formaldehyde"),(D,-,CH-=CH,-,,"ACETYLENE"):}`
Discussion
33.

Which islargest in size Cu^(+),Cu^(2+)or Cu and why ?

Answer»


ANSWER :Cu is largest due to less effective nuclear CHARGE. It has 29 electrons, 29 protons. `Cu^(+)`has 28 electronsand 29 protons, `Cu^(2+)` has 27 electrons and 29 protons [1]
Discussion
34.

The sigma bond formed between two carbon of ethene is result of overlapping of ……….. hybridized orbital.

Answer»

SOLUTION :`SP^(2) - sp^(2)`
Discussion
35.

Water can act as

Answer»

an acid
base
reductant
OXIDANT

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

Which gases are responsible for greenhouse effect ? List some of them.

Answer»

Solution : `CO_2`is the main GAS responsible for green-house effect. Other greenhouse gases are methane, nitrous oxide, water VAPOURS. chlorofluorocarbons (CFC's) and OZONE.
Discussion
37.

van der Waals' constant 'b' for oxygen is 32 cm^(3)//mol. Assume b is four times the actual volume of a mole of ''billiard-ball'' O_(2) molecules and compute the diameter of an O_(2) molecule.

Answer»
Discussion
38.

What are conjugate acid-base pairs? Give one example.

Answer»

SOLUTION :ACID - base PAIRS which differ by ONE proton are called conjugate acid - base pair.
`NH_(3)+H_(2)OtoNH_(4)^(+)+OH^(-)`
Conjugate base of acid `H_(2)O" is "OH^(-),H_(2)O+H_(2)OtoH_(3)O^(+)+OH^(-)`
Conjugate acid of base `NH_(3)" is "NH_(4)^(+),NH_(3)+NH_(3)toNH_(4)^(+)+NH_(2)^(-)`.
Discussion
39.

What is milk of lime? How CO_(2) reacts with it?

Answer»

Solution :The aqueous solution of CALCIUM hydroxide is known as LIME water and a SUSPENSION of slaked lime in water is known as MILK of lime. When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate
`Ca(OH)_(2) +CO_(2) to CaCO_(3) + H_(2)O`
Discussion
40.

Which of the following acts as Lewis acid ?

Answer»

H
He
S
B

SOLUTION :S has sixtet CONFIGURATION
Discussion
41.

What is Z in the following reaction? CH_(3)-CH_(2)-CO_(2)^(Theta)Na^(oplus)underset(Delta)overset(NaOH//CaO)rarrZ

Answer»

propane
n-butane
ethane
ethyne

Answer :C
Discussion
42.

What is an ionic bond ?

Answer»

Solution :An ionic BOND is the electrostatic force of attraction between oppositely charged ions. Or A chemical bond FORMED by COMPLETE transter of one or more electrons from outermost orbit of ELECTROPOSITIVE atom to OUTER most orbit of electronegative atom.
Discussion
43.

Which of the following use for mesurement of mass of D_2 and ND_3 ?

Answer»

Ferometer
pH meter
Spectrometer
Ameter

Answer :C
Discussion
44.

Vapour pressure increases with increase in :

Answer»

CONCENTRATION of solution CONTAINING non-volatile solute
temperature upto boiling point
temperature upto TRIPLE point
altitude of the concerned place of boiling

Answer :B
Discussion
45.

Which one of the following is a benzenoid aromatic compound ?

Answer»

Furan
Thiophene
Pyridine
ANILINE

Solution :Aniline, i.e.,option (d) is correct SINCE it CONTAINS a benzene RING.
Discussion
46.

Which one is the most stable carbonium ion?

Answer»

`F_(3)C- CH_(2)^(+)`
`(CH_(3))_(2)CH^(+)`
`CH_(3)^(+)`
`F_(3)C^(+)`

SOLUTION :According +I effect two methyl group INCREASE stability
Discussion
47.

Which of the following are correct ?

Answer»

`CH_3-O-CH_2^(o+)` is more stable than `CH_3-CH_2^(o+)`
`(CH_3)_2CH^(o+)` is less stable than `CH_3-CH_2-CH_2^(o+)`
`CH_2=CH-CH_2^(o+)` is more stable than `CH_3-CH_2-CH_2^(o+)`
`CH_2=CH^(o+)` is more stable than `CH_3-CH_2^(o+)`

Solution :
`CH_(3)O overset(+)(C)H_(2)` is stabilized by +I effect of the two `CH_(3)` groups while
is stabilized by only weak +I- effect of the `CH_3` GROUP. Thus, option (a) is CORRECT.
is stabilized by +I-effect of the ethyl group. SINCE +I-effect of the ethyl group is weaker than +I-effect of the two `CH_3` groups, therefore, `(CH_3)_2CH^+` is more stable than `CH_3CH_2-overset+CH_2` group. Thus , option (b ) is wrong.
is stabilized by strong resonance effect while, is stabilized by weak +I-effect of the `CH_2CH_3` group. The option (c ) is correct. In `CH_2=CH^+` , +ve charge is present on the more electronegative sp-hybridised carbon while in `CH_3-overset+CH_2`, +ve charge is present on the more electronegative sp-hybridized carbon while in `CH_3-overset+CH_2`. , +ve charge is present on the less electronegative `sp^2`-hybridized carbon, therefore , `CH_2=overset+CH` is less stable than `CH_3-overset+CH_2` . Thus option (d) is wrong.
Discussion
48.

What changes in pressure is sufficient to increase the products of this C_((s)) + CO_(2(g)) hArr 2CO_((g))reaction ?

Answer»

Solution :Here, in this forward REACTION, the gaseous mole INCREASE (2 out of 1 mole). So if the pressure DECREASE than the reaction take place in such direction where the MOLES of gas increases.
Discussion
49.

Which of the following posses 1^(@), 2^(@), 3^(@) and 4^(@) carbon?

Answer»

2, 3-dimethyl hexane
2, 3, 3-trimethyl hexane
2, 2-dimethyl hexane
2, 3, 4-trimethyl hexane

Solution :`overset(1^(@))(C )H_(3)- UNDERSET(underset(CH_(3))(|))overset(3^(@))(C )H-underset(underset(CH_(3))(|))overset(overset(CH_(3))(4^(@)|))(C )-overset(2^(@))(C )H_(2)- overset(2^(@))(C )H_(2)- overset(1^(@))(C )H_(3)`
Discussion
50.

Two beaker A and B present in a closed vessel. Beaker A contains 152.4 g aqueous soulution of urea, containing 12 g of urea. Beaker B contain 196.2 gglucose solution, containing 18 g of glocose. Both solution allowed to attain the equilibrium. Determine mass % of glocose in its solution at equilibrium allowed to attain the equilibrium :

Answer»

6.71
14.49
16.94
20

Answer :B
Discussion