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 compounds is isomeric with 2,2,4,4-tetramethylhexane?

Answer»

3-ethyl-2,2-dimethylpentane
4-isopropylheptane
4-ethyl-3-methyl-4-n-propyloctane
4,4-diethyl-3-methylheptane

Solution :`UNDERSET("2,2,4,4-tetramethylhexane")(H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-H_(2)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-H_(2)C-CH_(3))`
is isomeric with 4-isopropylheptane.
Discussion
2.

Which pair of the following chlorides do not impart colour to the flame ?

Answer»

`BeCl_(2) and SrCl_(2)`
`BeCl_(2) and MgCl_(2)`
`CaCl_(2) and BaCl_(2)`
`BaCl_(2) and SrCl_(2)`

Solution :`BeCl_(2)` and `MgCl_(2)` do not IMPACT colour to the flame due to their HIGH IONIZATION enthalpies .
Discussion
3.

The work function of a metal is 4.2eV. If the radiation of 2000Å falls on the metal, find the kinetic energy of the metal

Answer»

Solution :`"WORK FUNCTION "E_(0)=hv_(0)=4.2eV`
`=4.2xx1.602xx10^(-19)J=6.7284xx10^(-19)J`
`"Energy (E) is given as "`
`E=hv=(hc)/(LAMBDA)=(6.625xx10^(-34)Jxx3.0xx10^(8)ms^(-1))/(2000xx10^(-10)m)`
`"Threshold energy, "E_(0)=6.7284xx10^(-19)J`
`"KINETIC energy, "KE=E-E_(0)`
`=[9.939xx10^(-19)J-6.728xx10^(-19)J]`
`=3.211xx10^(-19)J`
Discussion
4.

Which law is signified by the relationV_1/T_1 = V_2/T_2 ?

Answer»

SOLUTION :CHARLES. LAW
Discussion
5.

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A) (i) Z = 17, A = 35 (ii) Z = 92, A = 233 (iii) Z = 4, A = 9

Answer»

SOLUTION :(i) `._(17)^(35)CL` (ii) `._(92)^(233)U` (III) `._(4)^(9)Be`
Discussion
6.

What volume of carbonmonoxide at 2 atm and 273^(@)C is required in order to produce 5.6 grams of metal by the reduction of ferric oxide?

Answer»

SOLUTION :Reduction of FERRIC oxide with carbonmonoxide gives iron metal.
`Fe_(2)O_(3)+3COrarr3CO_(2)+2Fe`
2 moles of `Fe -= 3` moles of CO
56 grams of `Fe -= 33.6` L of CO at STP
5.6 grams of `Fe -= 3.36` lit of CO at STP
The volume of CO required at STP = 33.6 L
`{:("STP CONDITIONS","Given conditions"),(P_(1)=1ATM,P_(2)=2atm),(T_(1)=273K,T_(2)=2xx273K),(V_(1)=3.36L,V_(2)=?):}`
`V_(2)=(P_(1)V_(1))/(T_(1))xx(T_(2))/(P_(2))=(1xx3.36xx2xx273)/(273xx2)=3.36L`
Discussion
7.

The valency shell configuration of IVA element is

Answer»

`ns^(2)np^(1)`
`ns^(2)np^(2)`
`ns^(2)np^(3)`
`ns^(2)np^(4)`

SOLUTION :IV A elements VALENCE shell CONFIGURATION is `ns^(2) np^(2)`
Discussion
8.

What is the normality of sulphate ions in 1M Al_(2)(SO_(4))_(3) solution?

Answer»


SOLUTION :`[SO_(4)^(2-)]=1xx3=3M=6N`
Discussion
9.

Why are BeSO_(4) and MgSO_(4)readily soluble in water while CaSO_(4), SrSO_(4) and BaSO_(4) are insoluble?

Answer»

Solution : Solubility of sulphates of group 2 ELEMENTS depends on their hydration ENERGY which decreases down the group.
The lattice energy of group 2 sulphates is almost same. Very high hydration enthalpy`Be^(+2)and Mg^(+2)`ions overcome the lattice enthalpy and their sulphates are soluble.
However, the hydration enthalpy of`CA^(2+), Sr^(2+)and BA^(2+)`cannot overcome their lattice enthalpy and remain insoluble in water.
Discussion
10.

Which one of the following statements regarding H_(2)O_(2) is false?

Answer»

It is more STABLE in a basic solution
It is decomposed by `MnO_(2)`
It is a strong OXIDISING as WELL as reducing AGENT in ACIDIC as well as in basic medium
It behaves as a weak acid

Answer :A
Discussion
11.

Which of the following gas is insoluble in water ?

Answer»

`SO_2`
`NH_3`
`H_2`
`CO_2`

SOLUTION :HYDROGEN is the LIGHTEST gas. It is INSOLUBLE in water.
Discussion
12.

The volume in litres of CO_2 librated at STP when 10 g of 90% pure limestone is heated completely,is

Answer»

`2.016`
`20.16`
`2.24`
`22.4`

SOLUTION :`CaCO_(3)rarrCaO+CO_(2)`
`100grarr22.4` LIT
`(90)/(100)xx10grarr?=2.016L`
Discussion
13.

Van der Waal's real gas, acts as an ideal gas, at which conditions

Answer»

HIGH TEMPERATURE, LOW PRESSURE
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure

ANSWER :A
Discussion
14.

The repetition of physical and chemical properties at regular intervals is called_______.

Answer»

ATOMIC radii
Periodicity
Colligative properties
electronegativity

Answer :B
Discussion
15.

Two isomeric cyclic dienes X and Y having molecular formula C_6H_8 on hydrogenation give cyclohexane as the only product. A mixture of these two dienes on reductive ozonolysis gives succinaldehyde, propane-1,3-dial and glyoxal. Deduce the structures of dienes X and Y.

Answer»

Solution :Since , X and Y on hydrogenation GIVE cyclohexane as the only product, therefore X and Y MUST be cyclohexadienes . The two possible cyclohexadienes are :

Whereas reductive ozonolysis of X will give two MOLECULES of propane-1,3-dial, reductive ozonolysis of Y will give succinaldehyde and glyoxal as shown below :
Discussion
16.

Whatis the effect of pressure on NaCl type crystals ?

Answer»

Solution :On INCREASING pressure, the COORDINATION NUMBER of NaCl type crystals increases from 6 : 6 to 8 : 8.
Discussion
17.

When PbO_(2) reacts with conc. HNO_(3), the gas evolved is

Answer»

`NO_(2)`
`O_(2)`
`N_(2)`
`Na_(2)O`

ANSWER :B
Discussion
18.

What are the possible values of principal (n) and azimuthal (l) quantum number for the unpaired electron in the atom of an element whose atomic number is 9 ?

Answer»

SOLUTION :`._(9)F = 1s^(2) 2s^(2) 2p_(x)^(2) 2p_(y)^(2) 2p_(Z)^(1)`. Hence, for the UNPAIRED `2p_(z)^(1)` ELECTRON, `N = 2, l = 1`
Discussion
19.

Which compound are taken in Kjeldabl's flask?

Answer»

SOLUTION :The compound which should be ESTIMATED + conc. `H_(2)SO_(4) + CuSO_(4)`
Discussion
20.

Which of the following is oxidized by H_(2)O_(2) in the alkaline medium

Answer»

HCHO
Mn (II) salts
Cr(III) salts
All of these

Answer :D
Discussion
21.

What is the purpose of levelling ?

Answer»

SOLUTION :To RECORD VOLUME under ATMOSPHERIC PRESSURE.
Discussion
22.

Wrlle Lewis structure of Nitrite ion. NO_(2)^(-1)

Answer»

Solution :(i) Total ELECTRON :
N ( Z = 7) : [He] `2s^(2) 2p^(3)` = 5 valence electron
O (Z = 8) : [He] `2s^(2) 2p^(4)` = (6) 2 valences electron
= 6 `XX` = 12 (Two oxygen)
(ii) Structural PRESENTATION : Electronegativity of N is less than O So N is central atom so the arrangement will be.

(iii) To get octet on N and O double bond is required between N and O.

In this WAY N has one double bond and one single bond. One .O. has one double bond and second .O. has single bond.
Discussion
23.

Which of the following resonating structures is not correct for carbon dioxide-

Answer»

`:OVERSET(..)(O)=C=overset(..)(O):`
`:UNDERSET(..)overset(..)(""^(-)O)-C=O^(+):`
`:underset(..)overset(..)(""^(+)O)-C=O^(-):`
`:""^(+)O-=C-underset(..)overset(..)(O)^(-):`

ANSWER :C
Discussion
24.

Which of the following are correct?

Answer»

Ordinary water is electrolyzed more rapidly than `D_2O`
Reaction between `H_2 and CI_2` is much FASTER than `D_2 and CI_2`
`D_2O`FREEZES at LOWER temperature than `H_2O`
Bond dissociation energy for `D_2` is greater than `H_2`

SOLUTION :a)Ordinary water is electrolyzed more rapidly than `D_2O`
B) Reaction between `H_2 and Cl_2` is much faster than `D_2 and Cl_2`
d) Bond dissociation energy for `D_2` is greater than `H_2`
Discussion
25.

When lactic acid is subjected to oxidation with Fenton's reagent, the main product formed is

Answer»

ACETIC acid
Oxalic acid
Pyruvic acid
Citric acid

Solution :`{:(""O),("||"),(CH_(3)-CH-COOH underset("Fenton's Reagent")overset(FeSO_(4)//H_(2)O_(2))(RARR) underset("Pyruvic acid")(CH_(3)-C-COOH)),("|"),(""underset("Lactic acid")(OH)):}`
Discussion
26.

Which compound is formed by heating with nitric acid in estimation of phosphorus in Carious method?

Answer»


ANSWER :`H_(3)PO_(4)`
Discussion
27.

Which of the following order(s) is correct

Answer»


`HCOOH GT CH_(3)COOH` (ACIDIC nature)

All the above

Answer :D
Discussion
28.

Which one of the following solutions are added to Lassaigne's extract to identify halogens?

Answer»

ACETIC acid + Lead acetate
dil `HNO_(3)+AgNO_(3)`
`FE(OH)_(2)+FeCl_(3)`
`Na_(2)CO_(3)+KNO_(3)`

Answer :B
Discussion
29.

Write the molecular orbital electronic configuration for carbon monoxide molecule. Calculate its bond order and comment on its magnetic property.

Answer»

SOLUTION :`sigma1s^(2) sigma^(**) 1s^(2) sigma 2s^(2) sigma^(**) 2 s^(2) pi 2 px^(2)=pi 2 py^(2)`
bond ORDER `=(N_(B)-N_(A))/2=1/2(8-4)=2`
Since there are no UNPAIRED electron it is diamagnetic in nature.
Discussion
30.

What is chain isomerism? Explain by giving example

Answer»

Solution :When two or more compounds have similar molecular FORMULA but different CARBON skeletons, these are referred to as chain isomers and the PHENOMENON is termed as chain isomerism.
e.g., `C_(5)H_(12)` (PENTANE) represents three compounds.
(i) `CH_(3)CH_(2)CH_(2)CH_(2)CH_(3)`: Pentane
(ii) `CH_(3)-underset(underset(CH_(3))(|))(CH)-CH_(2)CH_(3)`: Isopentane (2-methylbutane)
(iii) : Neopentane (2, 2-dimethyl propane)
Discussion
31.

The total number of structural isomers possible for hydrocarbon C_(5)H_(10) is:

Answer»

9
10
11
12

Solution :
Discussion
32.

Which of the following statement is/are wrong about pericyclic reaction?

Answer»

If the value of l = 0, the electron distribution is SPHERICAL
The SHAPE of the orbital is given by magnetic QUANTUM no
Angular moment of 1s, 2S, 3s ELECTRONS are equal
In an atom, all electrons travel with the same velocity

Solution :Shape is given by l `: v prop z //n`
Discussion
33.

Which of the following diagram correctly describes the behaviour of a fixed mass of an ideal gas ? (T is measured in K)

Answer»




ANSWER :A::B::C::D
Discussion
34.

Write the Lewis structure for CO molecule.

Answer»

SOLUTION :SEE the TEXTBOOK
Discussion
35.

What is the effect of temperature on ionic product of water and why ?

Answer»

Solution :Ionic PRODUCT of water `(K_(W))` INCREASES with INCREASE of temperature because `K_(w)=[H_(3)O^(+)][OH^(-)] and ` dissociation of `H_(2)O` to give `H_(3)O^(+)` and `OH^(-)` increases with increase of temperature.
Discussion
36.

Which of the followingN^(3-),O^(2-),F^(-) is largest in size?

Answer»

`N^(3-)`
`O^(2-)`
`F^(-)`
All of these

Answer :a
Discussion
37.

Which of the following statements is/are wrong

Answer»

The GAS displaced in VICTOR Meyer.s method is AIR
The simplest formula that SHOWS the ratio of the atoms of various ELEMENTS present in the molecule is called the molecular formula
Estimation of oxygen in an organic compound is also made by Aluise.s method
An organic monoacidic base B on reaction with `H_2PtCl_6` forms an insoluble compound `B_2H_2PtCl_6`

Answer :B
Discussion
38.

Which of the following is dihydric alcohol?

Answer»

Glycerol
Propylene glycol
Catechol
Resorcinol

Solution :`CH_(3)-CHOHCH_(2)OH`
Discussion
39.

When FeCl_(3) is added to the sodium extract of an organic compound containing both N and S, the red coloured precipitate is formed due to the formation of

Answer»

`[Fe(CN)_(6)]^(3-)`
`[Fe(CNS)]^(2+)`
`[Fe(CNS)_(2)]^(+)`
`[Fe(CN)_(6)]^(4-)`

Solution :When `FeCl_(3)` is added to the sodium extract of an organic compound containing both N and S, a red coloured precipitate of `[Fe(CNS)]^(2+)` is FORMED.
`NaCNS+FeCl_(3)RARR UNDERSET("Red coloured complex")([(Fe(SCN)]Cl_(2))DARR)+NaCl`
Discussion
40.

the energy of photon is equal to the kineticenergy of a porton,If lambda_1 is the De-Broglie wavelengthof a proton,lambda_2 the wavelength associated with the proton and if the energt of the protonis E, then (lamda_1//lambda_2) is proportional to

Answer»

`lambda_1+ lambda_2` = `lambda_3`
`(1)/(lambda_3) = 1/(lambda_1) + 1/(lambda_2)`
`lambda_3 = SQRT(lambda_1 lambda_2)`
`(2)/(lambda_3) = 1/(lambda_1) + (1)/(lambda_2)`

SOLUTION :`(E_R - E_Q) + (E_Q-E_P) = (E_R - R_P)`
`1/(lambda_1) + 1/(lambda_2) = 1/(lambda_3)`
Discussion
41.

What is thermodynamic scale of temperature ?

Answer»

SOLUTION :KELVIN SCALE
Discussion
42.

When mixture of CuCO_(3).Cu(OH)_(2)(s) and Pb(NO_(3))_(2)(s) is added in dil. HCI solution:

Answer»

suspension of `CuCO_(3).CU(OH)_(2)(s)` in colourless SOLUTION is precipitated
coloured solution and WHITE ppt. is produced
`CO_(2)` gas is evolved
`NO_(2)` gas is evolved

Answer :B::C
Discussion
43.

What happens when steam is passed over red hot iron?

Answer»

Solution :When steam is passed over RED hot IRON, iron oxide will be formed with the RELEASE of hydrogen.
`3Fe_((s))+4H_(2)O_((L))toFeO_(4(s))+4H_(2(g))`
Discussion
44.

What is meant by ionic product of water (K_(w))?

Answer»

SOLUTION :It is product of CONCENTRATION of `[H_(3)O^(+)]and[OH^(-)]` at a specific TEMPERATURE.
`K_(W)=[H_(3)O^(+)][OH^(-)]=1.0xx10^(-14)` at 298 K.
Discussion
45.

White fumes appear around the bottle of anhydrous aluminium chloride. Give reason.

Answer»

SOLUTION :ANHYDROUS aluminium chloride is PARTIALLY hydrolysed with atmospheric moisture to LIBERATE HCL gas. Moist HCl appears white in colour.
Discussion
46.

Using the following Latimer diagram for bromine, pH=0, BrO_(4)^(-) overset(1.82 V)rarr BrO_(3)^(-)overset(1.50 V)rarr HBrO overset(1.595 V) rarr Br_(2) overset(1.06552 V) rarr Br^(-) the species undergoing disproportionation is

Answer»

`BrO_(4)^(-)`
`BrO_(3)^(-)`
HBrO
`Br_(2)`

Solution :It the POTENTIAL to the left of a given chemical species is LESS than that to the right, thespecies will undergo DISPROPORTIONATION.
Discussion
47.

Using "Le" Chateller's principle, predict the effect of (i) decreasing the temperature and (ii) increasing the pressure on each of the following equilibria: (A) N_(2)(g)+3H_(2)(g)hArr2NH_(3)(g)+"Heat" (B) N_(2)(g)+O_(2)(g)hArr2NO(g)+"Heat" (C) H_(2)O(g)+"Heat"hArrH_(2)(g)+(1)/(2)O_(2)(g) (D) 2CO(g)+O_(2)(g)hArr2CO_(2)(g)+"Heat"

Answer»


SOLUTION :N//A
Discussion
48.

Which of the following statements is/are wrong?

Answer»

Sulphur is estimated by Carius method as `BaSO_4`
VICTOR Meyer.s Method is used for the DETERMINATION of molecular MASS of a non-volatile compound.
Kjeldahl.s method is used for all nitrogen-containing organic compounds
Phosphorous is estimated by Carius method as `MG(NH_4). PO_4`

ANSWER :C::D
Discussion
49.

What is used to represent the C= C in ball and stick model?

Answer»

Solution :In this model, SPRINGS is USED in PLACE of stick
Discussion
50.

Write formula of calculation of partial pressure ?

Answer»

<P>

Solution :(i) `p_(1)=(n_(1)RT)/(V) ""`……(i)
(ii) `p_(1)=x_(1)p_("total")""`…..(ii)
(III) `p_(1)=("% by volume"XX p_("total"))/(100)`
Discussion