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 MO's have two nodal plane ? .

Answer»

`sigma2p_(z)`
`pi^(**)2p_(x)`
`pi^(**)2p_(y)`
`sigma^(**)2p_(z)`

Solution :All antibonding `pi^(**) MO s` and bonding `sigma 2p_(z)` have TWO NODAL planes
Note Only bonding `sigma MO s` have ZERO nodal plane .
Discussion
2.

What are the types of bonds present in hydrogen cyanide molecule?

Answer»

Solution :Lewis dot structure of HCN is `H:Cvdots vdots N:`
The BONDS in HCN molecule are one single BOND and one triple bond. Further HCN molecule has to `SIGMA` and two `pi` bonds.
Discussion
3.

Which of the following has bond formed by overlap of sp^(3)-sp hybrid orbitals?

Answer»

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

ANSWER :A
Discussion
4.

The standard electrode potential of the electrode Ag(s) , AgCl| KCl (1 M) is

Answer»

`+0.2225 V`
`+0.2245 V`
`+0.2255 V`
`0.2265 V`

SOLUTION :`+0.2225 V`. It is SIMILAR to CALOMEL ELECTRODE.
Discussion
5.

Write the IUPAC names of the following compounds. (i) CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3) (ii) CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-CH_(3)-underset(underset(CH_(3))underset(|)(CH_(2)))underset(|)(CH)-CH_(3) (iii) CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)

Answer»

SOLUTION :(i) 2-ethyl-but-4-ene-oic ACID
(II) 2,2-dimethyl-hexanoic acid
Discussion
6.

Which of the following salts show chromyl chloride test?

Answer»

`KCI`
`CrCI_(3)`
`HgCI_(2)`
`FeCI_(3)`

ANSWER :A::B::D
Discussion
7.

Write the unit of van der Waal constant which represent the magnitude of attractive forces between gas molecules.

Answer»

SOLUTION :`L^2" ATM " MOL^(-2)`
Discussion
8.

Which one of the following has minimum gold number ?

Answer»

STARCH
SODIUM oxalate
Gum arabic
Gelatin.

Answer :D
Discussion
9.

Which of the following can act as Lowry -Bronsted acid as well as base?

Answer»

` HCL ` <BR>` SO_4^(2-)`
` HPO_4^(2-) `
` Br^(-) `

Solution :`HPO_4^(2-) to H^(+) +PO_4^(3-) , HPO_4^(2-)+H^(+) to H_2 PO_4^(-) `
Discussion
10.

Two elements A (At. wt. 75) and B (At. wt. 16) combine to yield a compound. The % by weight of A in the compound was found to be 75.08. The formula of the compound is:

Answer»

`A_(2)B`
`A_(2)B_(3)`
AB
`AB_(2)`

ANSWER :B
Discussion
11.

Write the IUPAC names of the following

Answer»

Solution :(a) The structure of the COMPOUND can be WRITTEN as : `CH_(3)-CH_(2)-UNDERSET(CH_(3))underset(|)underset(CH_(2))underset(|)OVERSET(CH_(3))overset(|)overset(CH_(2))overset(|)C-CH_(2)-CH_(3)`
The IUPAC name is Diethlpentane. (There is no need of given NUMBERING).
(b) The IUPAC name of the compound is 2-oxocyclohexane carboxylic acid. Carboxylic acid groupshould be given preference to keto group.
Discussion
12.

Which one is the major reason for pollution in big cities ?

Answer»

Fossil FUEL
ACID rain
Heat dispersion
None of the above

Solution :ONE of the majopr reason for pollution in big citiesis burining of fossil fuel.
Discussion
13.

Which of the following aromatic acids has lowest K_(a) ?

Answer»

<P>`p-` Nitrobenzoic ACID
`p-` Methoxybenzoic acid
`p-` Chlorobenzoic acid
benzoic acid

Solution : is the WEAKEST acid. So it haslowest `K_(a)`
Discussion
14.

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?

Answer»

NO
`N_2 O_5`
`N_2 O`
`NO_2`

SOLUTION :`N_2 O_5`
Discussion
15.

Which of the following are not hydrolysed ? MgCl_2, CuCl_2 , HCl , C Cl_4 , AlCl_3 , PCl_5

Answer»

SOLUTION :`C Cl_4 , PCl_5`
Discussion
16.

What of the following sets of quantum numbers are not possible? (i)n = 3, l = 2,m = 0, s = -1//2 (ii) n = 3, l = 2, m = -2, s = -1//2 (iii) n = 3, l = 3, m = -3, s = +1//2 (iv) n = 3, l = 1, m = 0, s + 1//2

Answer»


Solution :is not possible because if n = 3, L = 0, 1, 2
Discussion
17.

Which weighs the maximum ?

Answer»

2.24 litres of `CO_(2)` at N.T.P
`6.022 XX 10^(23)` molecules of `CO_(2)`
`6.022 xx 10^(23)` molecules of `CO_(2)`
10 G of `CO_(2)`

Solution :`6.022 xx 10^(23)` molecules of `CO_(2)` weigh 44 g (gram MOLAR MASS). Weigh maximum.
Discussion
18.

Write equation for calculate of pH of weak acid and weak base salt solution.

Answer»

SOLUTION :`pH=7+1/2(pK_a - pK_b)`
Discussion
19.

Which of the following compound(s) shows higher 'enol' content than 'keto'

Answer»




`H_(3)C_(6)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

Solution :Enol CONTENT in C&D is maximum due to resinance stability & chelation.
Discussion
20.

Which of the following compound gives easily sulphonation reaction ?

Answer»

Benzene
Nitrobenzene
Toluene
Chlorobenzene

Solution :`because` It has ACTIVATOR GROUP `-CH_(3)`.
Discussion
21.

Write the molecular formula of the first six members of homologous series of nitro- alkanes

Answer»

SOLUTION :Nitroalkanes:
1.`CH_(2)NO_(2)` Nitromethane
2. `CH_(2)-CH_(2)NO_(2)` Nitroethane
3. `CH_(3)-CH_(2)-CH_(2)NO_(2)` 1-nitropropane
4. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-NO_(2)` 1-nitrobutane
5. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-NO_(2)` 1-nitropentane
6. `CH_(2)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-NO_(2)` 1-nitrohexane
Discussion
22.

Which compounds are included in chemistry ?

Answer»

NATURAL
SEMISYNTHETIC
Synthetic
All of the above

Answer :A::B::C::D
Discussion
23.

What is the reactive intermediate in the reaction of 1,3-butadiene with HBr which results in1,2- and 1,4- addition?

Answer»

allylic radical
Dienophile
An allylic carbócation
A cyclic bromonium ion

Solution :The reaction of a diene with HBr PROCEEDS by PROTONATION of the diene to form an allylic o CARBOCATION.
Discussion
24.

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpairedelectrons according to the following relation : Magnetic moment, mu = sqrt(n(n+2)) B.M. Where .n. = number of unpaired electrons. B.M. stands for Bohr magneton, a unit of magnetic moment. Which of the following is diamagnetic ?

Answer»

`He^(2+)`
`SC^(+2)`
`Mg^(+2)`
`O^(-2)`

Solution :If the species contains paried `BARE`, then it is said to be DIAMAGNETIC in nature .
`Sc^(3+) (Z=21) [Ar] 3d^0 ,n=0`
Discussion
25.

The structure of (S)-2-fluorobutane is best represented by :

Answer»




SOLUTION :
Discussion
26.

When acetyl chloride reacts with sodium propionate, the product formed is

Answer»

ACETIC ANHYDRIDE
Acetic propionic anhydride
`N-`PROPYL acetate
Pent-2, 4-dione

Answer :B
Discussion
27.

The reagents used to prepare DDT are …………………… .

Answer»

SOLUTION :CHLORAL and CHLOROBENZENE
Discussion
28.

Which of the following tests would help in the distinction of HCOOH and CH_(3)COOH ?

Answer»

TREATMENT with Tollen's reagent
treatment with NaOH
treatment with Na
formation of their respective amides

Solution :`HCOOH` REDUCES Tollen's reagent but `CH_(3)COOH` does not
Discussion
29.

Which of the following will have largest size?

Answer»

BR
`I^(-)`
I
F

Answer :B
Discussion
30.

Which solutions, when mixed, forms acidic buffer ?

Answer»

`H_2SO_4` and `Na_2SO_4`
`CH_3COOH` and `H_2SO_4`
`CH_3COONa` and `CH_3COOH`
`NH_4Cl` and HCl

Answer :C
Discussion
31.

What is the expression for the energy of a photon?

Answer»

Solution :E = hn where, H = planks constant= `6.626xx10^(-34)` Js, `lamda`= frequency or RADIATION.
Discussion
32.

Which of the following pair of compounds cannot co-exist in aqueous solution?

Answer»

`Na_(2)CO_(3),K_(2)CO_(3)`
`NaHCO_(3),NaOH`
`Rb_(2)CO_(3),KHCO_(3)`
`NaOH` and `KCI`

SOLUTION :`NaHCO_(3) + NaOH RARR Na_(2)CO_(3)+H_(2)O`
Discussion
33.

Which of the following is not classified as a derivative of carboxylic acid ?

Answer»

alcohols
esters
ACID halide
amind

Solution :ALCOHOL is not a DERIVATIVE of CARBOXYLIC acid
Discussion
34.

Which of the following is heaviest?

Answer»

50g of iron
5 MOLES of nitrogen
0.1 gram ATOM of silver
`10^(23)` atoms of carbon

Answer :B
Discussion
35.

Which water pollutant produce from water used for cooling in industries?

Answer»

HEAT
Pesticides
HEAVY metals
None of these

Solution :Heat
Discussion
36.

Which of the following IUPAC names are incorrect

Answer»

2-methyl-2-propylhexane
2-methyl HEXANE
3,3-dimethylpentane
3-ethyl-2,2-dimethylpentane

SOLUTION :2-methyl-2-propylhexane.
Discussion
37.

When CO_(2) is bubbled in excess of water , the following equilibrium is established . CO_(2) + 2 H_(2)O hArr H_(3) O^(+) + HCO_(3)^(-) K_(c) = 3.8 xx 10^(-7) , pH = 6 What would be the [HCO_(3)^(-)] //[CO_(2)] ?

Answer»

6
0.0038
0.038
0.38

Answer :D
Discussion
38.

Write the half equations for each of the following redox reactions. NO_(3)^(-)+ZntoZn^(2+)+NH_(3)^(+)

Answer»

SOLUTION :`ZntoZn^(2+)` (OXIDATION HALF EQUATION)
`NO_(3)^(-)toNH_(4)^(+)` (reduction half equation)
Discussion
39.

When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberatel in equal volumes according to the equation, xCu+yHNO_(3)toCu(NO_(3))_(2)+NO+NO_(2)+H_(2)O The coefficients x and y are _______

Answer»

2 and 3
2 and 6
1 and 3
3 and 8

Answer :B
Discussion
40.

Write the chemical formulae of the following compounds: washing soda, baking soda, caustic soda.

Answer»

SOLUTION :`Na_2CO_3, NaHCO_3,NAOH`
Discussion
41.

Which of the following element has less electronegativity

Answer»

O
S
F
N

ANSWER :B
Discussion
42.

Which ion will be hydrolyse in NH_4Cl solution ?

Answer»

SOLUTION :`NH_4^+` is hydrolyse , `because` It is a ion of weak BASE
`Cl^-` is not hydrolyse `because` It is ion of STRONG ACID.
Hydrolysis : `NH_4^(+) + H_2O HARR NH_4OH+ H^+`
Discussion
43.

The solubility product of BaSO_4 at 18^(@) C is 15 xx 10^(-9)Its solubility (mole"lit"^(-1)) at the same temperature is

Answer»

`1.5 XX 10^(-9) `
` 1.5 xx 10^(-5)`
` 3.9 xx 10^(-9)`
` 3.9 xx 10^(-5)`

Solution :` K_(SP)=1.5 xx 10 ^(-9) `
`S = sqrt( K_(sp) ) = sqrt( 1.5 xx 10 ^(-9) )= 3.9 xx 10 ^(-5) M`
Discussion
44.

When NaH is electrolysed, then _________ is released at anode.

Answer»


ANSWER :`H_(2)`
Discussion
45.

Which is the lightest among the following?

Answer»

An ATOM of HYDROGEN
An ELECTRON
A NEUTRON
A proton

Answer :B
Discussion
46.

Which has no rotation of symmetry ?

Answer»

HEXAGONAL
Orthochromic
Cubic
TRICLINIC

Solution :A triclinic UNIT CELL has no rotational axis of symmetry.
Discussion
47.

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition?

Answer»

`q=0,DELTAT LT0,w cancel(=) 0`
`q=0, DeltaTcancel(=) 0,w=0`
`qcancel(=) 0,DeltaT , w=0`
`q=0,DeltaT=0,w=0`

Solution :For adiabatic expansion, `q=0`
For free expansion, `P_(EXT) = 0`. Hence,`w-0`
`DeltaU = q+w=0+0=0`. As U is a function of TEMPERATURE `( U = (3)/(2) nRT)` and as `DeltaU = 0,:.DeltaT =0`
Discussion
48.

What will be the resultant products formed when the phosphorus hailde PBr_(5) splits up ?

Answer»

`[PBr_(4)]^(+)andBr^(-)`
`[PBr_(6)]^(-)and[PBr_(4)]^(+)`
`[PBr_(4)]^(+)`
`[PBr_(6)]^(-)`

SOLUTION :`2PCl_(5)tounderset("TETRAHEDRAL")(PBr_(4)^(-))+B^(-)`
Discussion
49.

The temperature at which the vapour pressure of a liquid equals external pressure in called

Answer»

FREEZING POINT
boiling point
melting point
CRITICAL TEMPERATURE

Answer :B
Discussion
50.

The statement that is not correct for periodic classification of elements is :

Answer»

The properties of elements are PERIODIC FUNCTION of their atomic numbers.
Non-metallic elements are less in NUMBER than metallic elements.
For transition elements, the 3D-orbitals are filled with electrons after 3p-orbitals and before 4S-orbitals
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.

Solution :Order of filling of electrons for trnsition metal in various orbitals is `3p lt 4s lt 3d`
. Therefore, 3d orbital is filled when 4s orbital gets fully field by electrons.
Discussion