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 an example of the disproportionation reaction ?

Answer»

ALDOL condensation
Thischenko REACTION
Rosenmund's reaction `HCOONA`
CANNIZZARO reaction

Answer :D
Discussion
2.

Which of the following behave both as a nucleophile as well as an electrophile ?

Answer»

`CH_(3)OH`
`CH_(3)Cl`
`CH_(3)CN`
HCHO

Solution :`CH_(3)C-=N` and `H_(2)C = O` both ACT as nucleophiles due to the presence of lone pair/s of ELECTRONS on oxygen or NITROGENS and electrophiles due to the presence of multiple BONDS.
Discussion
3.

Which of the following compounds is resistant to nucleophilic attack by hydroxyl ion ?

Answer»

Methylacetate
Acetonitrile
Acetamide
Diethylether

Solution :ACID DERIVATIVES are ATTACKED READILY by nucleophiles while ether are not
Discussion
4.

What is the major product obtained by nitrationof m-xylene?

Answer»

SOLUTION :In m-xylene, both METHYL groups are - directing.
The MAJOR PRODUCT is 1-nitro -2,4 - dimethyl benzene.
Discussion
5.

The relative order of esterification of the following alcohols is

Answer»

`I lt II lt III`
`I gt II gt III`
`I lt III lt II`
`I gt III gt II`

SOLUTION :The rate DETERMINING step for esterification is the addition of ALCOHOL. The rate determining step involves change of HYBRIDISATION of carbonyl carbon from `sp^(2)` to `sp^(3)`, and consequently steric retardation increases as the size of alcohol increases and hence the rate of esterification DECREASES
Discussion
6.

What is the oxidation number of nitrogen in HNO_(3), HNO_(2), NO, N_(2)O and N_(2)?

Answer»


ANSWER :`+5,+3,+2,+1,0`
Discussion
7.

The volume of methane at N.T.P. formed from 8.2 g. of sodium acetate by fusion with soda lime is

Answer»

10 LIT
11. 2 lit
5.6 lit
2.24 lit

Answer :D
Discussion
8.

What is the IUPAC naem of the following compound ?

Answer»

4-Bromo-3-methylpent-2-ene
2-Bromo-3-methylpent-3-ene
3-Bromo-3-methyl-1, 2-dimethylprop-1-ene
3-Bromo-1, 2-dimethylbut-1-ene

Answer :A
Discussion
9.

To prevent table salt from absorbing moisture and to make it flow freely certain additives are added to table salt . Name one such compound and explain how does it work ?

Answer»

SOLUTION :The additive is `Ca_(3)(PO_(4))_(2) or CA(H_(2)PO_(4))` which prevent moisture absorbing power of other compounds `(MgCl_(2) , CaCl_(2) , MgSO_(4) , CaSO_(4)`, ETC) present in table salt and thus keeps table salt dry . Further , both Ca and P are NEEDED by the human biological system and hence do not cause any side effect .
Discussion
10.

Tom' cat arranges the glass balls, in a particular 3D array, that two (I and II) continuous layer are not identical, but all (I and III) alternative layer are identical, this type of arrangement is known as:

Answer»


ANSWER :ABAB.... Type arrangement (UNIT CELL = HCP)
Discussion
11.

The solution of which does not produce precipitate when treated with K_(2)CO_(3) is

Answer»

`BaCl_(2)`
`CaBr_(2)`
`MgCl_(2)`
`Na_(2)SO_(4)`

Solution :SINCE the carbonates of only alkali metals are soluble in `H_(2)O` while those of all other metals are insoluble in `H_(2)O` , therefore , `Na_(2)SO_(4)` does not produce a ppt. with `K_(2)CO_(3)`.
Discussion
12.

Which is Kelvin scale of temperature better than celsius scale?

Answer»

Solution :Kelvin scale is BETTER than as MIXTURE of non reacting gase. In this case, the two gases will immediately COMBINE to form `CO_(2)(g)`.
Discussion
13.

Which of the following is correct IUPAC name of CH_(3) - underset(underset(CH_(3))(|))(CH)-CH_(2)-underset(underset(CH_(3))(|))(CH)-CH_(3) ? Why? (i) 2-methyl-4-methylpentane (ii) 2, methyl, 4, methylpentane (iii) 2-4 dimethyl pentene (iv) 2, 4-dimethylpentane (v) 2, 4-dimethyl pentane

Answer»

Solution :(iv) Because in it.s the comma (,) present between NUMBERS and (-) dash present between numbers and LETTERS and the word .pentane. is not SEPARATE
Discussion
14.

What type of bond is formed when atoms have high difference of electronegativity?

Answer»

Solution :When ATOMS have HIGH difference of electronegativity (`gt` 1. 7), ionic bond is FORMED
Discussion
15.

Which one of the following is correct when an ideal gas is expanded adaibaticallyand reversibly ?

Answer»

`q=0,W=nC_(v) dT, DeltaU= nC_(v)dT`
`q=0,W=0,DeltaU = nC_(v)dT`
`q=0,W= nC_(v)d,DeltaU =0`
None of the above

Solution :For ADIABATIC expansion, `q=0`
As` DeltaU = q+W:. DeltaU = W`
Further , `C_(v)= ((delU)/(delT))_(V) ` or `dU = C_(v)dT`
For n moles , `W = n C_(v)dT`
and `dU = nC_(v) dT`
Discussion
16.

Which is incorrect about alkyl bromide having molecular formula C_5H_11Br

Answer»

ONE isomeric ALKYL bromide undergoes E1 elimination at the fastest rate
Only one is INCAPABLE of REACTING by the E2 mechanism
Only one isomer gives a single ALKENE on E2 elimination
2-Bromopentane gives the most complex mixture of alkenes on E2 elimination

Solution :[C] is incorrect because more than one isomer gives a single alkene on E2 elimination.
Discussion
17.

What is the potential of an electrode which originally contained 0.1 MNO_3^-) and 0.4MH^+ and which has been treated by 80% of the cadmium necessary to reduce all the NO_3^- to NO(g) at 1 bar? Give: NO_3^(-)+4H^++3e^-)to NO+2H_2O,E^(@)=0.96V, log2=0.3

Answer»

0.84V
1.08V
1.23V
1.36V

Answer :A
Discussion
18.

Write the conjugate base of HCO_(3)^(-).

Answer»


ANSWER :`Co_(3)^(-2)`
Discussion
19.

whichof thefollowingCANNOTformperoxide?

Answer»

CS
Mg
Be
All of these

ANSWER :D
Discussion
20.

Which of the four quantum number (n, l, m_(l), m_(s)) determine (a) the energy of an electron in a hydrogen atom and in a many electron atom (b) the size of an orbital (c) the shape of an orbital (d) the orientation of an orbital in space ?

Answer»

SOLUTION :(a) Energy of ELECTRON in HYDROGEN atom is determined by n and in a many electron atom byn and l
(B) SIZE of the orbital is determined by n
(c) Shape of the orbital is determined by l
(d) Orientation of the orbital is determined by `m_(l)`
Discussion
21.

Which of the following pair is represent identical compound ?

Answer»




SOLUTION :In (B) OPTIONS both are ECLIPSED and IDENTICAL.
Discussion
22.

Write down the possible isomers of C_5H_11BrBr and give their IUPAC and common names.

Answer»

SOLUTION :
Discussion
23.

Which factors are affect and not affected to equilibrium ?

Answer»

Solution :(a) change in CONCENTRATION (b) change in PRESSURE (CONTAINING gaseous component) (c) change in temperature are FACTORS that affects the EQUILIBRIUM.
Catalyst and inert gas are not affects the equilibrium.
Discussion
24.

The super oxide among the following

Answer»

`BaO_(2)`
`PbO_(2)`
`KO_(2)`
`SnO_(2)`

Solution :`KO_(2)`is a superoxidehence oxidationstate of O is +`1/2`
Discussion
25.

What is a Grignard reagent ? How is propane prepared from a Grignard reagent ?

Answer»

Solution :Alkylmagnesium halides are CALLED GRIGNARD reagents . For example, n-propyl BROMIDE reacts with magnesium to form n-propylmagnesium bromide. This upon treatment with water gives PROPANE.
`CH_3CH_2CH_2Br + Mg overset"Dry ether " to CH_3CH_2CH_2MgBr` (Grignard reagent )
`CH_3CH_2CH_2MgBr + H_2O to CH_3CH_2CH_3+ Mg(OH)Br`
Discussion
26.

whichof the followingis a cycloalkane ?

Answer»




ANSWER :B
Discussion
27.

Which of the following solution will have pH closer to 1.0 ?

Answer»

100 ml of (M/ to ) HCl +100 ml of (M/10) NaOH
55 ml of (M/to) HCl +45ml of (M/10) NaOH
10 ml of (M/10)HCl+90 ml of (M/10) NaOH
75 ml of (M/5) HCl +25ml of (M/5) NaOH

SOLUTION :` N_aV_a =(1)/(5) xx 75 =15 ,N_bV_b =(1)/(5)xx 25 =5`
if `N_aV_agt N_bV_b`
` [H^(+)] =(N_aV_a- N_bV_b)/(V_a+V_b) =(15-5)/(100)=0.1 therefore pH =1`
Discussion
28.

What is positive resonance or inductive effect of group?

Answer»

SOLUTION :The transfer of electrons is AWAY from an atom or GROUP is CALLED POSITIVE effect
Discussion
29.

Under which of the following conditionis the relation DeltaH = DeltaE+ P DeltaH valid for a closed system?

Answer»

constant pressure
constant temperature
constant temperature and pressure
constant temperature, pressure and composition

Solution :`H=E+PV:. DELTAH = DeltaE + P DELTAV + V DeltaP `. If P is constant, i.e., `DeltaP =0`,only then`DeltaH = DeltaE + P DeltaV`
Discussion
30.

When Na_(2)CO_(3) is added to an aqueous solution of CuSO_(4)

Answer»

`CuCO_(3)` is PRECIPITATED
Copper hydroxide is precipitated
Basic copper CARBONATE is percipitated
No REACTION takes place

Answer :C
Discussion
31.

The shape of [OH_3]^(+) is

Answer»

TETRAHEDRAL
ANGULAR
PYRAMIDAL
TRIGONAL planar

Answer :C
Discussion
32.

Which of the following molecules has the higher bond order ? (1) BN (2) CO (3) NO (4) Ne_2 (5) F_2

Answer»

Solution :(2) CO has a BOND order of 3.
OTHERS have bond orders of
(1) 2(3) 2.5 (4) - and (5) 1
Discussion
33.

Tincture of iodine consists of a solution of

Answer»

`I_(2)` in ETHYL ALCOHOL
`I_(2)` in WATER
`I_(2)` in KI solution
`CHI_(3)` in alcohol

Answer :A
Discussion
34.

Which of the following not a Lewis cid

Answer»

`SiF_(4)`
`FeCl_(3)`
`BF_(3)`
`C_(2)H_(4)`

Solution :`.C_(2)H_(4).` is ELECTRON precise compound.
Discussion
35.

What is ("mol. Wt")/("Eq. wt") of FeC_(2)O_(4) getting converted into Fe^(+3) and CO_(2)?

Answer»


Solution :`FE^(++)+C_(2)O_(4)^(--)rarrFe^(+++)+2CO_(2)+3E^(-)` n factor = 3
Discussion
36.

Why AlF_(3)is a high melting solid wheareas SIF_(4) is a gas ?

Answer»

Solution :`AIF_(3)` is an ionic SOLID due to LARGE differnce in electronegtivies of Al and F whereas `SiF_(4)` is a covalent
COMPOUND and hence there are only weak van der Walls forces among their MOLECULES .
Discussion
37.

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

Answer»

SOLUTION :
Discussion
38.

Which substance can be recycled ?

Answer»

PAPER
Plastic
Glass
All of these

Solution :Paper
Discussion
39.

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

Answer»

SOLUTION :
Discussion
40.

What are the conditions for ideal behaviour ?

Answer»

Solution :(a) The experimental observation made at extremely high PRESSURE adn 100 TEMPERATURE have show that, there is no gases which obeys ideal gas equation under all the CONDITIONS to TEMEPRATURE and pressure . (b) The concept is only hypothetical or imaginary.
Discussion
41.

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

Answer»

SOLUTION :
Discussion
42.

Which of the following statements are incorrect ?

Answer»

In absorption spectrum, the bright lines are formed on dark back GROUND
In emission spectrum, dark spectral lines are formed on bright ground
HYDROGEN spectrum is an example of absorption spectrum
The INTENSITY of spectral lines depends on population of ENERGY levels between which electronic transition takes place.

Answer :A::B::C
Discussion
43.

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

Answer»

SOLUTION :
Discussion
44.

When gets are allowed to stand, they give out small quantity of liquid (or water). This process is called

Answer»

COAGULATION of gel
Syneresis
Thixotropy
NONE of the above.

Answer :B
Discussion
45.

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

Answer»

SOLUTION :
Discussion
46.

Which of the follwing order is wrong?

Answer»

`SO_(2),P_(2)O_(5),CO`
`BEO,Al_(2)O_(3),SO_(2)`
`CaO,SiO_(2),Al_(2)O_(3)`
`CO_(2),Al_(2)O_(3),CO`

Solution :`BAO to`Basic, `Al_(2)O_(3)to`amphoteric, `SO_(2) to` acidic.
Discussion
47.

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

Answer»

SOLUTION :
Discussion
48.

The uncertanities in then velocities of two particle A and B are 0.05 and 0.02ms^(-1) respectively.The mass of B is five times to that of A.What is the ratio of uncertainities [(Delta x_(A))/(Delta x_(B))]in their positions?

Answer»


ANSWER :`DELTA x_(A) : Delta x_(B) = 2:1`
Discussion
49.

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

Answer»

SOLUTION :
Discussion
50.

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

Answer»

SOLUTION :
Discussion