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.

What are the causes for deviation of real gases from ideal behaviour.

Answer»

Solution :The CAUSES are : (a) The VOLUME occupied by molecules is negligle (b) the INTERMOLECULAR forces of ATTRACTION are NEGLIGIBLE.
Discussion
2.

Using the equation of state pV = nRT , show that at a given temperature density of a gas is proportional to gas pressure p.

Answer»

Solution :IDEAL GAS equations, pV = nRT
`therefore p=((n)/(V))RT ""` …..(a)
but, mole of gas (n) `= (m)/(M)`
where, m = mass of gas is constant
M = molecular mass of gas is ALSO constant
`therefore p=(mRT)/(MV) ""` ……(b)
but, `(m)/(V)=("mass of gas")/("volume of gas")=` density of gas (d)
Which is put in eq. (b) According to this,
`p=(dRT)/(M)`
Thus, `p prop d ""` .....(at constant T and V)
..At constant temperature and volume, PRESSURE of fixed AMOUNT of gas is directly proportional to its density...
Discussion
3.

Which of the following relates to photon both as wave motion and as a stream of particles ?

Answer»

`E=mc^(2)`
Photoelectrical effect
Diffraction
`E=hv`

ANSWER :D
Discussion
4.

Write the IUPAC name of CH_(3)-underset(Cl)underset(|)(CH)-CH_(2)-CH=CH_(2)

Answer»

2-chloro-pent-4-ene
4-chloro-pent-1-ene
4-chloro-pent-1-one
none of these

Solution :4-chloro-pent-1-one
Discussion
5.

The total number of orbitals associated with the principle quantum number n=3 is

Answer»

9
8
5
7

Answer :A
Discussion
6.

Which one of the following is most reactive towards nucleophilic substitution reaction ?

Answer»




SOLUTION :
Discussion
7.

Which of the following contains the greatest number of oxygen atoms?

Answer»

1 G of O
1 g of `O_(2)`
1 g of `O_(3)`
all have the same NUMBER of ATOMS

Answer :D
Discussion
8.

Which of the following reagents cannot be used for converting ?

Answer»

`CH_(3)COOH//H_(2)SO_(4)`
`CH_(3)COCH_(3)`
`(CH_(3)CO)_(2)O`
`CH_(3)COCl`

Solution :Acetone `(CH_(3) COCH_(3))` cannot be used for acetylating an `-OH` group
Discussion
9.

Two solid A "and" B are present in two different container having same volume and same temperature following equilibrium are established: In container (1)A(s)hArrD(g)+C(g)P_(T)=40 "atm at equilibrium" In container (2)B(s)hArrE(g)+F(g)P_(T)=60 "atm at equilibrium" If excess of A "and" B are added to a third container having double the volume and at same temperature then, the total pressure of this container at equilibrium is:

Answer»

`50` ATM
`100` atm`
`200` atm
`70` atm

Solution :N//A
Discussion
10.

Which of the followingsets of quantumnumbersrepresentsthe highestenergyof an atom ?

Answer»

n=3 ,l= 0 m=0 ,s=`(1)/(2)`
n=3,l=1 m=1,s= `(1)/(2)`
n=3,l=2 m=1 s=`(1)/(2)`
n=4,l=0 m=0 ,s=`(1)/(2)`

SOLUTION :n+ 1 is MORETHAN energyis more .
Discussion
11.

Write the Lewis dot structure of CO molecule.

Answer»

SOLUTION :
Discussion
12.

Which of the following statements about amorphous solid is incorrect ?

Answer»

They MELT over a range of TEMPERATURE
They are anisotropic
There is no orderly arrangement of particles
They are rigid ASND incompressible

Solution :AMORPHOUS solids are ISOTROPIC.
Discussion
13.

Which of the following is used in cakes or pastries to making them light and fulffy ?

Answer»

`Na_(2)CO_(3)`
`NaHCO_(3)`
`NaCl`
`NAOH`

ANSWER :B
Discussion
14.

What is the value ofDeltaH in the following reaction at 300 K ? CH_(4)(g) 2O_(2)(g) rarr CO_(2)(g)+2H_(2)O(l), DeltaU = 885389J //mol.

Answer»

SOLUTION :`DELTAH = DeltaU + Deltan_(g)RT = 885389+ ( -2) XX 8.314 xx 300 = - 880400 J mol^(-1)`
Discussion
15.

When is a cation highly polarising ? Which alkali metal cation has the highest polarising power ?

Answer»

Solution :A cation is HIGHLY POLARISING if its charge/SIZE ratio is very high. Because of its small size ,`Li^(+)` ion has the highest polarising power AMONG the ALKALI metal ions.
Discussion
16.

Which of the following is more soluble in water

Answer»

`LiCl`
`LIBR`
`LIF`
`LIII`

Answer :C
Discussion
17.

What is the maximum nad minimum oxidation states for Na Mg AI Sn and Mn?

Answer»

Solution :The minimum oxidation state for all metals is 0 the MAXIMUM oxidatin state for s and p block elements is EQUAL to the numbre of ELECTRONS present inn the valence shell thus maximum oxidation stateof Na=+1 that of MG is +2 that of AI is +3 and that of k `ll` Sn is +4
However for d block elemtys the maximum oxidation state is equal to hte sum of (n-1) d and ns electons thus maximum oxidation state of Mn`(3d^(5) 4S^(2))=5+2=+7`
Discussion
18.

What is the volume (in lit) of carbon dioxide liberated at STP, when 2.12 grams of sodium carbonate (mol. wt = 106) is treated with excess dilute HCl?

Answer»

`2.28`
`0.448`
`44.8`
`22.4`

SOLUTION :`Na_(2)CO_(3) +3HCI rarr 2NaCI +CO_(2) +H_(2)O`
Discussion
19.

What type of structure is possessed byH_(2)O_(2) molecule? Draw it and label the varous bond angles and bond length . Comment on the dipole moment of H_(2) O_(2)molecule .

Answer»

Solution : As ` H_(2) O_(2)` is not a linearbut has a bent STRUCTURE as SHOWN in , therefore , bond MOMENTS
do not cancel out and as a result , it has a net dipole MOMENT of 2.1 D
Discussion
20.

Which of the following statement is/are incorrect about of 'Y' and 'Z'?

Answer»

The pink colour is due to adsorption of `KMnO_(4)` on `BaSO_(4)` surface
`H_(2)O_(2)` is unable to reduce adsorbed `KMnO_(4)` of pink ppt. of 'Y'
The compound 'Y' is ALSO formed when `BaSO_(3)` is EXPOSED to air and PRODUCT is added in `KMnO_(4)` solution.
None of the above

Answer :D
Discussion
21.

Which of the following statement (s) is/are correct? Statement (i) : The entropy of isolated system with P-V work only is always maximized at euilibrium. Stetement (ii) : It is possible for the entropy of close system to decreases substantilly in an irreversible process. Statement (iii) : Entropy can be created but not be destroyed. Statement (iv) : DeltaS system is zero for reversible process in an isolated system.

Answer»

Statements `I,II,iii` ,
Statement `ii,IV`
Statement `I,ii,iv`
All of these

SOLUTION :NA
Discussion
22.

Which of the following colour changes shown during redox titrations is not correct ?

Answer»

`Cr_(2)O_(7)^(2-)` oxidises the indicator diphenylamine to produce blue colour showing end point.
Iodine formed by OXIDATION of `I^(-)` ions givesblue colour with starch showing end point.
`KMnO_(4)` in the FORM of `MnO_(4)^(-)` ions gives pink colour showing end point.
THIOSULPHATE ions `(S_(2)O_(3)^(2-))` give blue colour showing end point.

Solution :Thiosulphate ions do not act as indicator and do not indicate end point by change in colour.
Discussion
23.

Which pair of species are formed when hydrogen peroxide is react with suspension of PbS ?

Answer»

`PBO+ SO_2 + H_2O`
`PbSO_4 + H_2O`
`PbSO_3 + H_2O`
`Pb+SO_2 + H_2O`

Solution :`PbS_((s)) + 4H_2O_(2(AQ)) to PbSO_4 + 4H_2O_((L))`
Discussion
24.

Which of the following structure is correctly drawn according to fundamental idea of VSEPR theory?

Answer»




ANSWER :C
Discussion
25.

The wave length having wave number 4000 cm^(-1) is

Answer»

`2.5 mu m`
`250 mu m `
`25 mu m `
`25 nm`

Solution :`lambda = 1/(bar(V))`
Discussion
26.

What is the prescribed standard of desirable limit of TDS (Total Dissolved Solids) of drinking water according to BIS?

Answer»

250 PPM
500 ppm
200 ppm
300 ppm

SOLUTION :500 ppm
Discussion
27.

Which of the following reactions does not involve the change in oxidation state of metal?

Answer»

`VO^(-2) rarr V_(2)O_3`
`K rarr K^(+)`
`CU^(2+) rarr CUS `
`Cu^(2+) rarr Cu`

Solution :In `Cu^(2+) rarr CuS , Cu ` is in +2 oxidation state in both reactant and product.
Discussion
28.

Writethe value of K_p and K_C equation for CaCO_(3) (s) hArr CaO(s) + CO_(2)(g)

Answer»

Solution : A pure solid ALWAYS has the same CONCENTRATION at a given temperature, as it does not expand to fill its CONTAINER i.e., it has the same no. of moles of its VOLUME. Therefore the concentration of pure solid is a constant. So the EXPRESSION if `K_(c) "and " is K_(p) is K_(c) = [CO_2].K_p = P_(CO_3)`
Discussion
29.

Which one of the following is called 2-cyclobutylpropanal?

Answer»



`CH_(2)=CH-CH=CH_(2)`
`CH_(3)-CH_(2)-CH_(2)-CHO`

ANSWER :B
Discussion
30.

Which chemical is used to remove fluoride from water?

Answer»

`MG Cl_2`
`CaCl_2`
`BaCl_2`
`SrCl_2`

SOLUTION :`CaCl_2`
Discussion
31.

What is the role of Fe(OH)_3 in the contact process ?

Answer»

To REMOVE COLLOIDAL IMPURITIES
To remove moisture
To remove DUST particles
To remove impurities of Arsenic

Answer :D
Discussion
32.

What is the maximum numaber of emission lines obtained when the excited electron of a H atom in n=6 drops to the ground state ?

Answer»

Solution :No. of LINES produced when electron from nth shell drops to ground state
`Sigma (n_(2)-n_(1))=Sigma (6-1)= = Sigma 5=5+4+3+2+1=15`
There are produced DUE to FOLLOWING transitions :
`{:(6 rarr 5,5 rarr 4,4 rarr 3,3 rarr 2,2 rarr 1),(6 rarr 4,5 rarr 3,4 rarr 2,3rarr1,),(6 rarr 3,5 rarr 2,4 rarr 1,,),(6 rarr 2,5 rarr 1,,,),(6 rarr 1,,,,),(("5 lines"),("4 lines"),("3 lines"),("2 lines"),"(1 lines)"):}`
Discussion
33.

When methane is burnt in oxygen to produce CO_(2) and H_(2)OFind the Change in oxidation number ?

Answer»


Solution :`OVERSET(-4) (CH_4)+2O_(2) rarroverset(+4)(CO_2)+2H_(2)O`
Oxidation no. CHANGE `=+4 -(-4) =+8`
Discussion
34.

What is the IUPAC name of

Answer»

3-Ethyl-5-methyl-1-n-propylbenzene
3-Ethyl-5-propyltoluene
3-Ethyl-1-methyl-5-n-propylbenzene
1-Ethyl-3-methyl-5-n-propylbenzene

ANSWER :D
Discussion
35.

The wave function Phi_(n,l,m_(1)) is a methematical function whose value depends upon shperical upon spherical polar coordinates (r,theta,phi) of the electron and characterized by the quantum numbers, n,l and m_(1).Here r is distance from nucleus, theta is colatitude and phi is azimuth. in the mathematical functions given in the table, Z is atomic number, a_(0) is Bohr radius. . Q. For hydrogen atom the only CORRECT combination is :

Answer»

(I) (iv) (R)
(I) (I) (P)
(II) (i) (Q)
(I) (i) (S)

SOLUTION :1s (orbita) has wave function `Phi_("nlm")prop((Z)/(a_(0)))^((3)/(2))E^(-Zr//a_(0))`
`E=-(Z^(2))/(n^(2))xx13.6eV`
`DeltaE_(2-4)=(1)/(16)xx13.6-(-(1)/(4)xx13.6)`
`=(3)/(16)xx13.6eV`
`DeltaE_(2-6)=-(1)/(36)xx13.6-(-(1)/(4)xx13.6)`
`=(8)/(36)xx13.6eV`
`(DeltaE_(2-4))/(DeltaE_(2-6))=(3//16xx13.6eV)/(3//36xx13.6eV)`
`=(3xx36)/(16xx8)=(27)/(32)`
`thereforeDeltaE_(2-4)=(27)/(32)DeltaE_(2-6)`
Discussion
36.

The wave function Phi_(n,l,m_(1)) is a methematical function whose value depends upon shperical upon spherical polar coordinates (r,theta,phi) of the electron and characterized by the quantum numbers, n,l and m_(1).Here r is distance from nucleus, theta is colatitude and phi is azimuth. in the mathematical functions given in the table, Z is atomic number, a_(0) is Bohr radius. . Q. For the given orbital in column 1, the only correct combination forany hydrogen-like species is:

Answer»

(IV) (iv) (R)
(II) (ii) (P)
(III) (iii) (P)
(I) (ii) (S)

SOLUTION :
Number of RADIAL NODE in `2s=n-l-1`
`=2-0-1=1`
Discussion
37.

The wave function Phi_(n,l,m_(1)) is a methematical function whose value depends upon shperical upon spherical polar coordinates (r,theta,phi) of the electron and characterized by the quantum numbers, n,l and m_(1).Here r is distance from nucleus, theta is colatitude and phi is azimuth. in the mathematical functions given in the table, Z is atomic number, a_(0) is Bohr radius. . Q. For He^(+) ion, the only INCORRECT combination is:

Answer»

<P>(II) (ii) (Q)
(I) (i) (P)
(II) (i) (Q)
(I) (i) (S)

ANSWER :D
Discussion
38.

Who is the first member of alkene series ? Give information about its bond and structure.

Answer»

Solution :General formula of alkene is `C_(n)H_(2n)`. If n = 1 `1^(st)` member is methane. Age of methene is too LESS. THEREFORE, methane is not TAKEN as first member of alkene.
`1^(st)` member of alkene is `C_(2)H_(4)` bond structure of ETHENE.
Discussion
39.

Which type of hybridization is called (a) tetrahedral (b) trigonal ?

Answer»

SOLUTION :`SP^(3)`(B) `sp^(2)`
Discussion
40.

Which of the following statements is correct? Dielectric constant of H_(2)O_(2)?

Answer»

Zeolites have a more closed struture than feldspar.
`H_(4)As_(2)O_(7)` is an 'ortho' acid.
Pseudo-alum does not have `Na^(+)" and "K^(+)`.
Superphosphate of lime is `4Ca(H_(2)PO_(4))_(2)`.

SOLUTION :Pseudo-alum constitue a CLASS in which monovalent atom of true alum is REPLACED by a divalent atom. Hence, `Na^(+)" and "K^(+)` are not present
Discussion
41.

The strength of sigma bond formed by s-s, s-p & p-p overlaps are in the order

Answer»

`s-s GT s-p gt p-p`
`p-p gt s-s- gt s-p`
`p-p gt s-p gt s-s`
`s-s gt p-p gt s-p`

SOLUTION :More the DIRECTIONAL character, greater is the strengthof the BOND.
Discussion
42.

What are H_bBH_b and H_tBH_t angles in diborane ?

Answer»

SOLUTION :`97^@ , 120^@`
Discussion
43.

Which of the following possess zero dipole moment

Answer»

trans-2,3-dichloro-2-butene
cis-2,3-dichloro-2-butene
trans-3-hexene
cís-2-pentene

Solution :Dipole MOMENTS CANCEL out each other in trans COMPOUNDS
Discussion
44.

Which of thefollowingatomsshould have thehighest1 st electron affinity ?

Answer»

F
O
N
C

Solution :The negativeof electrongainenthalpy is takenaas electronaffinity . Electron affinitieshavepositivevalues. Howeverelementsof GROUP2, 18 and Nhave zerovalues . ThusF hasthe highestelectronaffinityi.e.,option ( a) iscorrect.The actualorderof electronaffinitiesin kJ `mol^(-1)` howeverfollowsthe ORDER :`F (328 ) gt O (141) gt C (122)gt N` (ZERO) .
Discussion
45.

What type of interations hold the molecules together in a polar molecular solid ?

Answer»

SOLUTION :DIPOLE - dipole ATTRACTIONS.
Discussion
46.

Which of the following oxide react with quick lime and produce Ca(PO_(4))_(2) ?

Answer»

`P_(4)O_(6)`
`SiO_(2)`
`P_(2)O_(4)`
`P_(4)O_(10)`

Solution :`6CaO+P_(4)O_(10) to 2Ca_(3)(PO_(4))_(2)`
Discussion
47.

Which one of the following is used to test primary amines?

Answer»

Schiff's TEST
Carbylamine test
DYE test
SILVER mirror test

SOLUTION : Carbylamine test
Discussion
48.

whichof thefollowing reactionsindicate arerrangementreactioninvolvingmodificationof functionalgroup ?

Answer»

`CH_(3)- OVERSET(CH_(3))overset(|)CH-CH_(2) Ohoverset(H^(+))hArrCH_(3) - underset(CH_3)underset(|)overset(CH_3)overset(|)C-OH`
`H_(2) c= CH_(2)+HOSO_(3) H to H_(3) C-CH_(2)-OSO_(3)HH_(3)C-CH_(2) OSO_(3)H+H_(2)O overset(DELTA)to H_(3) C-CH_(2)-OH+H_(2)SO_(4)`

Answer :D
Discussion
49.

Write the equation to calculate the energy of n^(th) orbit.

Answer»

Solution :`E_n=((-1312.8)Z^(2))/(N^(2))kJmol^(-1)`
Where Z=atomic NUMBER,n=principle quantum number.
Discussion
50.

Which effect is observed on velocity distribution if temperature increases.

Answer»

Solution :Due to TEMPERATURE INCREASES then GRAPH BECOMES wide and flat and most probable speed increases and number of MOLECULES increases.
Discussion