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.

Writes short notes on Hyperconjucation

Answer»

Solution :Hyper conjucation : This delocalisation of electrons of ` sigma ` bond is called as hyper conjugation . It is a SPECIAL stabilising effect that results due to the interaction of electrons of a ` sigma ` - bond (USUALLY -H or C-C) with the adjacent, empty non-bonding p-orbital or an anti-bonding ` sigma^(**) " or" pi^(**)` - orbitals resulting in an extended MOLECULAR orbital . Unlike electromeric effect, hyper conjugation is permanent effect . In PROPENE , the` sigma `-electrons of C-H bond of methly group can be delocalised into the `pi-` orbitals of doubly bonded carbon as represeted below,
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Discussion
2.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
3.

Which of the following species are Isoelectronic with Ne? (Atomic no of Ne=10). N^(3-),Na^(+),Al^(3+),Ar,Rb^(+) & F^(-)

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Answer :All elements contains TOTAL 10 ELECTRONS.
Discussion
4.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
5.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
6.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
7.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
8.

Which of the following mainlycauses water pollution?

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FLY ash
Auto exhausts
Aeroplanes
PESTICIDES

ANSWER :D
Discussion
9.

When compound A (orange red) is heated then green coloured oxide of (B) is formed and inert gas. (C) is formed then select the correct statements:

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Compound (A) is `(NH_(4))_(2)Cr_(2)O_(7)`
Compound (B) is used in fireworkd
Gas C is `N_(2)`
Heating effect of (A) is a type of INTRAMOLECULAR redox reaction

Answer :A::B::C::D
Discussion
10.

Which of the following converts CH_(3)CONH_(2) to CH_(3)NH_(2) ?

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NaBr<BR>NaOBr
`Br_(2)`
NONE of these

Solution :Hoffmann bromamide REACTION. `Br_(2)` and NaOH together can carry out this CONVERSION
Discussion
11.

What is the total number of orbitals associated with the principal quantum number n=3 ?

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<P>

Solution :For N = 3, the possible values of l are 0,1 and 2. Thus, there is one 3s orbital (n = 3, l = 0 and `m_l` = 0), there are THREE p ORBITALS (n = 3, l = 1 and ml = -1, 0, 1) there are five 3d orbitals (n = 3, l = 2, ml = -2, -1, 0, 1, 2).
THEREFORE, the total number of orbitals is 1+3+5 = 9.
Discussion
12.

What is the product of the reaction C_(6)H_(5)COOCH_(3) overset(LiAlH_(4))rarr...... + ........

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`C_(6)H_(5)COOH + CH_(3)OH`
`C_(6)H_(5)CH_(2)OH + CH_(3)OH`
`C_(6)H_(5)CHO + CH_(3)COOH`
All the above products.

Answer :B
Discussion
13.

Under similar conditions of temperature and pressure gas having highest rate of diffusion is

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oxygen
ACETYLENE
sulphur dioxide
CARBON MONOXIDE

ANSWER :D
Discussion
14.

When 11.2 g of KOH is added to one litre of 'X' M H_(2) SO_(4) solution , the pOH of the solution becomes 13.301 . Then the value of 'X' is (assume no changein the volume of solution by the addition of KOH)

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`0.4`
`0.6`
`0.8`
`0.2`

ANSWER :D
Discussion
15.

Write the electronic configuration of Lithium molecule.

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SOLUTION :`SIGMA1S^(2),sigma1s^(2),SIGMA2S^(2)`
Discussion
16.

What is known as asymmetrical alkene ? Give examples.

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SOLUTION :When different alkyl groups attached to the two carbon having double BOND then such TYPE of ALKENE is known as asymmetrical alkene.
e.g., `CH_(3)CH=CHC_(2)H_(5)`
Discussion
17.

What is in reactivity in same period in left to right?

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SOLUTION :Reactivity of ELEMENTS of the end of the PERIODIC table is more, but in the middle reactivity of elements DECREASES.
Discussion
18.

Which of the following metal chloride gives hydrated salt ?

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CS
NA
K
LI

ANSWER :D
Discussion
19.

Which sulphides are soluble only in aqura regina ?

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NiS
CoS
HgS
all of these

Solution :All sulphides are soluble in aqua REGIA which is a mixture of conc. HCL (3 parts) and conc. `HNO_(3)` (1 part)
Discussion
20.

When a rod of copper is immersed in a solution of ZnSO_(4) zinc gets precipitated.

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ANSWER :F
Discussion
21.

What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15,19,23,44 with dry dihydrogen ? Compare their behavoiur towards water.

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Solution :(i) ELEMENT with Z =15 is a non-metal (i.e. P)and hence forms covalent hydride (i.e. `PH_(3)`)
(ii) Element with Z=19 is an alkali metal (i.e. K) and hence forms saline or ionic hydride (i.e. `K^(+)H^(-)`)
(III) Element with atomic number Z=23 is a transition metal (i.e. V) of group 3 and hence forms a metallic or insterstitial hydride (i.e. `VH_(0.56)`)
(iv) Element with Z=44 is a transition metal (i.e. Ru) of group 8 and hence does not FORM any hydride (hydride GAP).
Behaviour towards water. Only ionic hydrides react with water EVOLVING `H_(2)` gas. Thus,
`2KH(s) + 2H_(2)O(s) to 2KOH (aq) + 2H_(2)(q)`
Discussion
22.

Which of the following compounds have same empirical formula ? a) formaldehyde "" b) Glucose c) Sucrose "" d) Acetic acid

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only a , B
only b , C
a, b , d
a ,b, c

ANSWER :C
Discussion
23.

Which of the following statement/s is/are not correct

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Physical adsorption is directly related to the critical temperature of the gas (adsorbate)
ONE gram of CHARCOAL at `25^(@)C` will always adsorb the same AMOUNT of a particular gas at a particular pressure
At particular temperature, adsorption always increases with increase of pressure
In adsorption, the concentration of adsorbate is always greater at the surface of the adsorbent

Solution :(B) is wrong because adsorption depends upon the surface area.
(c) is wrong because at about `0^(@)C`, adsorption remains constant after a particular pressure.
(d) Is wrong because there can be negative adsorption also.
Discussion
24.

What is ring - chain tautomerism ?

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Solution :Ring - Chain tautomerism occurs in sugars. (aldehyde vs the pyranose of FURANOSE STRUCTURE) - Oxocarboxylic ACIDS etc.
Discussion
25.

Which of the following produces four monochloro derivatives on free radical chlorination ?

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2,2-dimethylbutane
PENTANE
2,2-dimethylpropane
2-methylbutane

ANSWER :D
Discussion
26.

Which order is true with reference to size of species?

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`M^(4) lt M^(2+) lt M `
`M lt M^(2+) lt M^(4+)`
`M^(2+) lt M lt M^(4+)`
`M lt M^(2+) lt M^(4+)`

Solution :"As NUCLEAR charge is greater, the size of it is smaller in different ISOELECTRONIC species.
Discussion
27.

Which of the following is called negative overlap?

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ANSWER :C
Discussion
28.

What type of semiconductro is obtained when siliicon is doped with arsenic ?

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SOLUTION :N -TYPE SEMICONDUCTOR.
Discussion
29.

Write the functional grop for (i) Aldehyde (ii) Ketone.

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Answer :(i)ALDEHYDE: (-CHO) (II) Ketone: (-CO-)
Discussion
30.

The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to

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ionic nature of lithium fluoride
high lattice ENTHALPY
high hydration enthalpy for lithium ion
low IONZATION enthalpy of lithium atom

Solution :Due to smal size of `Li^(+)` and `F^(-)`lattice enthalphty in MUCH higher than hydration enthalpy
Discussion
31.

Whenever an intermediate carbocation is formed in reaction it may rearranges. Only those carbocation will rearrange which can produce more stable species . It can be done either by : (i) Shifting of H, alkyl , aryl, bond (1,2-shifting ) (ii) Ring expansion (iii) Ring contraction In which of the following carbocation rearrangement will not take place ?

Answer»




ANSWER :B
Discussion
32.

Write formulas for the following compounds : (a) Mercury (II) chloride (b) Nickel (II) sulphate ( c) Tin (IV) oxide (d) Thallium (I) sulphate (e) Iron (III) sulphate (f) Chromium (III) oxide

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Solution :(a) Mercury (II) chloride - `Hg(II)Cl_(2)`
(B) NICKEL (II) sulphate - `NI(II)SO_(4)`
( c) TIN (IV) oxide - `Sn(IV)O_(2)`
(d) Thallium (I) sulphate - `Tl_(2)(I)SO_(4)`
(e) Iron (III) sulphate - `Fe_(2)(III)(SO_(4))_(3)`
(f) Chromium (III) oxide - `Cr_(2)(III)O_(3)`
Discussion
33.

Which of the following is an element?

Answer»

`CO_2`
`CH_4`
F
`NH_3`

ANSWER :C
Discussion
34.

Whenever an intermediate carbocation is formed in reaction it may rearranges. Only those carbocation will rearrange which can produce more stable species . It can be done either by : (i) Shifting of H, alkyl , aryl, bond (1,2-shifting ) (ii) Ring expansion (iii) Ring contraction Most stable rearranged carbocation is is

Answer»




SOLUTION :
Discussion
35.

Which of the following compound is given red colour in Lassaigne's test?

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NACNS
`NH_(2) - UNDERSET(underset(S)(||))(C )-NH_(2)`
`NH_(2)- underset(underset(O)(||))(C )-NH_(2)`

Answer :B::D
Discussion
36.

Which of the following electronic configuration is n o t possible ?

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`3d^(2)`
`2P^(2)`
`3f^(2)`
`4S^(2)`

SOLUTION :`v=(C )/(LAMBDA) therefore c=v.lambda`
Discussion
37.

Which metal ion is present in chlorophyl the green pigment of plants

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`Ca^(2+)`
`Be^(2+)`
`MG^(2+)`
`AL^(3+)`

Solution :`Mg^(2+)` ion is present in the green colouring PIGMENT CHLOROPHYL in plants.
Discussion
38.

When the pressure on a gas is decreased to 1/4 and the absolute temperature is increased four-fold the volume of the gas

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INCREASES by 16 TIMES 
decreases to 1/16 
Increases by 8 times 
REMAINS the same 

ANSWER :A
Discussion
39.

Which one of the following reacts with CH_3Mglfollowed by acid hydrolysis to yield acetic acid?

Answer»

`CNCL`
`CH_3COOC_2H_5`
`HCOOC_2H_5`
`CO_2`

SOLUTION :`CO_2`
Discussion
40.

Which of the following compounds do not contain pi-bond?

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`CH_(3)CHO`
`CH_(3)COOH`
`CH_(3)CONH_(2)`
`CH_(3)CH_(2)OH`

SOLUTION :
Discussion
41.

Which of the followingg compounds is not correctly matched wiith its IUPAC name?

Answer»

`CH_(3)CH_(2)CH_(2)COOCH_(2)CH_(3)`-Ethyl butanoate
`CH_(3)-UNDERSET(CH_(3))underset(|)(C)H-CH_(2)-CHO-3-`Methylbutanal
`CH_(3)-underset(CH_(3))underset(|)(C)H-underset(O)underset(||)(C)-CH_(2)CH_(3)-2-`methylpentan-3-one
`CH_(3)-underset(OH)underset(|)(C)H-underset(CH_(3))underset(|)(C)H-CH_(3)-3-`Methylbutan-3-ol

Solution :`CH_(3)-underset(OH)underset(|)(C)H-underset(CH_(3))underset(|)(C)H-CH_(3)`
The correct name is 3-methylbutan-2-ol since functional group should GET lowest NUMBER.
Discussion
42.

Which of the following is metal displacement reaction

Answer»

`Zn + CuSO_(4)rarrZnSO_(4) + Cu`
` 2Na + 2H_(2)O rarr2NaOH +H_(2)`
`Ca+2H_(2)Orarr Ca(OH)_(2)+H_2`
`2HgO rarr 2Hg+O_2`

Solution : Reactions involved in a METAL REPLACED by another metal KNOWN as metal displacement reactions.
Discussion
43.

Which is formed when SiCl_(4) vapours are passed over hot Mg

Answer»

`SiCl_(2) + MgCl_(2)`
`SI + MgCl_(2)`
`MgSi+Cl_(2)`
`Si+Mg`

SOLUTION :`SiCl_(4) + 2MG rarr MgCl_(2) + Si`
Discussion
44.

Which of the following sets will have highest hydration enthalpy and highest ionic radii ?

Answer»

Na and Li
Li and RB
K and Na
Cs and Na

Solution :Li has the highest hydration enthalpy , Rb has HIGHER ionic radius than Li .
Discussion
45.

The solubility of alkali metal hydroxides follows the order

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`LiOH LT NaOH lt KOH lt RbOH lt CSOH`
`LiOH gt NaOH gt KOH gt RbOH gt CsOH`
`LiOH gt CsOH gt RbOH gt NaOH gt KOH`
NONE of these

Answer :A
Discussion
46.

Threshold frequency, v_(0) is the minimum frequency which a photon must posses to eject an electron from a metal. It is different for different metals. When a photon of frequency 1.0 xx 10^(15) s^(-1) was allowed to hit a metal surface, an electron having 1.988 xx 10^(-19) J of kinetic energy was emitted. Calculate the threshold frequency of this metal. Show that an electron will not be emitted if a photon with a wavelength equal to 600nm hits the metal surface.

Answer»

Solution :`hv = hv_(0) + K.E. or hv_(0) = hv - K.E.`
or `v_(0) = v - (K.E.)/(h) = 1.0 xx 10^(15) s^(-1) - (1.988 xx 10^(-19) J)/(6.626 xx 10^(-34) Js)`
`= (1.0 xx 10^(15) - 0.30 xx 10^(15)) s^(-1) = 0.97 xx 10^(15) s^(-1)`
`9.7 xx 10^(14) s^(-1)`
When `LAMDA = 600nm, " i.e., " 600 xx 10^(-9) m or 6.0 xx 10^(-7) m`
`v = (c)/(lamda) = (3.0 xx 10^(8) ms^(-1))/(6.0 xx 10^(-7) m) = 0.5 xx 10^(15) s^(-1) = 5 xx 10^(14) s^(-1)`
THUS, `v lt v_(0)` Hence, no electron will be emitted
Discussion
47.

Which of the folowings statements are not true ?

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Vacancy defect results in a decrease in the DENSITY of the substance.
Intersitital defect results in an increase in the density of the substance .
IMPURITY defect has no effect on the density of the substance.
Frenkel defect results in an increase in the density of the substance.

Solution :© is not true because impurity defect CHANGES the mass but not the VOLUME.
(d) is not true because Frenkel defect neither changes mass nor volume.
Discussion
48.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
49.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion
50.

Write the possible structures for the following molecules .Show the direction of the movement of electrons with the help of arrows.

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SOLUTION :
Discussion