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.

Write the structures and names of products obtained in the reaction of sodium with a mixture of 1-iodo-2-methylpropane and 2-iodopropane.

Answer»

Solution :WURTZ REACTION between 1-iodo-2-methylpropane and 2-iodopropane gives the following THREE PRODUCTS :
Discussion
2.

Two structures of anilinium are given. Choose the correct statement

Answer»

II is not an ACCEPTABLE canonical structure because it is non-aromatic
II is not an acceptable canonical structure because carbonium ions are less STABLE than `NH_(4)^(+)` ion
II is not an acceptable canonical structure because the nitrogen has 10 valency electtrons
II is an acceptable canonical structure

Answer :A
Discussion
3.

The Rydberg's constant is 1.097373177 xx 10^(7)m^(-1). It can be expressed to three significant figures as

Answer»

`1.0974 XX 10^(7)m^(-1)`
`1.09 xx 10^(7)m^(-1)`
`1.10 xx 10^(7)m^(-1)`
`1.10^(7)m^(-1)`

SOLUTION :`1.10 xx 10^(7)m^(-1)`
Discussion
4.

Why an aqueous borax solution is alkaline to litmus?

Answer»

Solution :`B_4 O_(7)^(2-)` is CONJUGATE base of weak ACID tetraboric acid. Due to anion hydrolysis, the AQUEOUS solution of borax is basic.
` B_(4)O_(7)^(2-) +7H_2 O hArr2OH^(-) +4H_3 BO_(3)`.
Discussion
5.

The solubility of KCIO_(3) at several temperature is shown in the accoupanying diagram. A student mixed 10.0g of KCIO_(3) with 45.0g of H_(2)O and stires it for a long time at 60^(@)C until the solution is completely clear then allows it to cool slowly to 20^(@)C where it remains clear. which statement about the final clear mixture at 20^(@)C is correct ?

Answer»

It is a SATURATED SOLUTION
It is an UNSATURATED solution and can be MADE saturated by decreasing the temperature
It is an unsaturated solution and can be made saturated by increasing the temperature
It is supersaturared solution

Answer :D
Discussion
6.

What is the value of Z for real gas ?

Answer»

1
0
`GT 1`
`lt 1`

ANSWER :C
Discussion
7.

The temperature of 5 moles of a gas is decreased by 2K at constant pressure of 1 atm. Indicate the correct statement

Answer»

<P>Work done by GAS is = 5R
Work done on the gas is = 10R
Work done by the gas = 6R
Work done = 0

Solution :For 5 moles of gas at temperature T,
`pv_(1) = 5RT`
For 5 moles of gas at temperature T-2
`PV_(2) = 5R (T-2)`
`:. P(V_(2) - V_(1)) = 5R (T-2-T), P DELTA V = -10R, - P Delta V = 10R`
When `DeltaV= 10R`
When `Delta V` is negative, W is +ve
Discussion
8.

Which of the following represent the given mode of hybridisation sp2, sp2, sp, sp from left to right ?

Answer»

`H_(2)C=CH-C -= N`
`H_(2)C=C=CH-CH_(3)`
`HC -= C-C -= CH`
`HC -= C-CH=CH_(2)`

Solution :`H_2C = CH-C^@ N`
Discussion
9.

What type of cations are tested by borax bead test?

Answer»

SOLUTION :COLOURED CATIONS
Discussion
10.

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

Answer»

Solution :(i) This set of QUANTUM numbers is not permitted since the value of L cannot be equal to N.
(ii) This set of quantum number is permitted.
(iii) This set of quantum number is not permitted because the value of SPIN quantum number cannot by zero.
(iv) This set of quantum numbers is also not permitted since the vlaue of 'm' cannot be GREATER than. 1.
Discussion
11.

Which one of the following curves represents the graph pH during the titration of NaOH and HCl(aq)

Answer»




SOLUTION :N//A
Discussion
12.

What will be the mole fraction of solution if solution cantain 0.1 mole of each A, B & C ?

Answer»

`1.0`
0.3
0.1
`1/3`

ANSWER :A
Discussion
13.

Three gases A,B and C have values of van der Waal's constnat, a (in units of" litre"^(3) "mol"^(-2) atm) of 1.38,6.70 and 4.00 respectively. The ease of liquefaction of gases decreases in the order:

Answer»

`BgtAgtC`
`BgtCgtA`
`AGTBGTC`
`CgtAgtB`

ANSWER :B
Discussion
14.

What are ternary hydrides? Give example?

Answer»

Solution :Ternary HYDRIDES are COMPOUNDS in which the molecule is CONSTITUTED by HYDROGEN and two types of elements, EG.. LIBH, or LiAlH
Discussion
15.

What is the difference between diffusion and effusion ? Which law is applicable to the process of effusion ?

Answer»

SOLUTION :Graham.s LAW.
Discussion
16.

Which effect provides the experimental justification for magnetic quantum number?

Answer»

ALTUTUDE EFFECT
LATITUDE effect
Stoke effect
Zeeman effect

Answer :D
Discussion
17.

Which of the following is the most acidic ?

Answer»

HCOOH
`CH_(3) COOH `
`CH_(3) CH_(2) COOH `
`CH_(3)CH_(2) CH_(2) COOH`

SOLUTION :N/A
Discussion
18.

What is similar between (i) Na and Na^(+) (ii) F and F^(-)

Answer»

Solution :(i) Atomic number of Na and `Na^(+)` having same (Z = 11).
(II) Atomic NUMBERS of F and `F^(-)` having same (Z = 9).
Discussion
19.

Which of the following statements about hydrogen are correct ?

Answer»

Hydrogen has three isotopes of which protium is the most common.
Hydrogen NEVER ACTS as cation in ionic salts.
Hydrogen ions, `H^(+)` , exists freely in ionic solutions
Dihydrogen does not act as a reducing agent.

Solution :Hydrogen has three isotopes . HOWEVER, `H^(+)` being SMALL never exists as cation in ionic compounds.
Discussion
20.

Which of the following processes can be used for the purification of colloids?

Answer»

Coagulation
DIALYSIS
Flocculation
All of the above

Solution :Dialysis (SEE COMPREHENSIVE REVIEW)
Discussion
21.

What is the pH of 0.005 M Ba(OH)_2 ?

Answer»

SOLUTION :`[OH^-]`=(0.005) x 2 = 0.01 = `1xx10^(-2)`
THEREFORE pOH=2 and pH=12
Discussion
22.

What do you understand by the terms"

Answer»

Solution :(i) Hydrogen econom:Consult SECTION 9:5
(ii)Hydrogenation:Consult section 9:4
(III) Syn gas: Consult section 9:3
(iv) Water gas shift reaction: Consult section 9:3
(V) Fuel cell: Consult section 9:5
Discussion
23.

What is d-block elements and transition elements ? Explain characteristic of d-block elements.

Answer»

Solution :"Elements of group 3 to 12 are known as d-block elements."
General electronic configuration of these elements are `(n -1) d^(1-10) ns^(0-2)`.
These elements are known as d-block elements because their last electron is filled in d-orbital.
Characteristic of d-block elements :
They are all metals. They mostly form coloured ions, exhibit variable valence (oxidation states), paramagnetism and oftenly used as catalysts.
However, Zn, CD and Hg which have the electronic configuration, (n - 1) `d^(10) ns^(2)`do not show most of the properties of TRANSITION elements.
Transition Elements : In a way, transition metals form a bridge between the chemically active metals of s-block elements and the less active elements of Groups 13 and 14 and thus take their familiar NAME "Transition Elements".
Discussion
24.

Which of the following reaction causes depletion of ozone layer in summer season.

Answer»

`ClONO_(2(g))+H_2 OrarrHCOl_((g))+NHO_(3(g))`
`ClONO_(2(g))+HCl_((g))rarrCl_(2(g))+HNIO_(3(g))`
`HOCl_((g))overset(hupsilon)rarroverset(*)OH+Coverset(*)l(g)`
`UNDERSET("REACTANTS")(A+B)rarrunderset("PRODUCT")(C("wanted"))`
`Cloverset(*)O+NO_(2(g))rarrClONO_(2(g))`
`Coverset(*)l_((g))+CH_(4(g))rarroverset(*)CH_3HCl_((g))`

Answer :D
Discussion
25.

What is the dominant intermolecular force or bond that must be overcome in converting liquid methanol to a gas?

Answer»

LONDON DISPERSION force
Hydrogen BONDING
Dipole-dipole interaction
Covalent bonds

Answer :B
Discussion
26.

Which statement is correct?

Answer»

Both are AROMATIC compounds.
P is non-aromatic.
Q is aromatic.
P is more STABLE than Q.

Solution :N//A
Discussion
27.

The region which is extended upto 500 km above sea level is known as .....

Answer»

ATMOSPHERE
troposphere
stratosphere
ENVIRONMENT

SOLUTION :atmosphere
Discussion
28.

Which of the following free radicals is the least stable ?

Answer»

`*CH_(3)`
`*CH_(2)-CH_(3)`
`CH_(3)-Coverset(*)(H)-CH_(3)`
`CH_(3)-underset(underset(CH_(3))(|))overset(*)(C)-CH_(3)`

Solution :Hyper conjugation Among the given FREE RADICALS, `overset(*)CH_3` is the least stable since it has No-Hyper conjugation.
Discussion
29.

Which of the following is most volatile

Answer»

Diamond
SODIUM CHLORIDE
Calcium
Dry ICE

ANSWER :D
Discussion
30.

When water is added to compound (A) of calcium , solution of compound (B) is formed . When carbon dioxide is passed into the solution , it turns milky due to the formation of compound (C) . If excess of carbon dioxide is passed into the solution , milkiness disappears due to the formation of compound D. Identify the compounds A , B , C and D . Explain why the milkiness disappears in the last step .

Answer»

Solution :When `CO_(2)` is passed through solution of COMPOUND (B) , it TURNS milky , therefore , solution of compound (B) must be lime water , i.e., `Ca(OH)_(2)` solution and milkiness must be due to the formation of insoluble `CaCO_(3)` (C) . Further since , compound (B) is obtained by dissolving compound (A) in water , therefore , compound (A) must be quick lime , CAO
`underset((A)) underset("Calcium OXIDE")(CaO) + H_(2)O underset("Lime water (B)")(Ca(OH)_(2)) , CO_(2) to underset("Milkiness)")underset("carbonate (C)")underset("Calcium")(CaCO_(3)) + H_(2)O`
When EXCESS of `CO_(2)` is passed milkiness disappears due to formation of soluble calcium bicarbonate (D)
`underset("Milkiness (C)")(CaCO_(3)) + CO_(2) + H_(2)O to underset("(Soluble in" H_(2)O")") underset("Calcium bicarbonate")(Ca(HCO_(3))_(2))`
Thus , compound (A) = CaO , Compound (B) = `Ca(OH)_(2)` , Compound (C) = `CaCO_(3)` and compound (D) = `Ca(HCO_(3))_(2)`.
Discussion
31.

Write the possible isomers for the formula C_(5)H_(10)O with their name indicating position isomerism.

Answer»

SOLUTION :(i) `UNDERSET("pent-2-one")(CH_(3)-underset(O)underset(||)C-CH_(2)-CH_(2)-CH_(3))` (II) `underset("pent-3-one")(CH_(3)-CH_(2)-underset(O)underset(||)C-CH_(2)-CH_(3)`
Discussion
32.

Which of the following acidic radicals produce coloured volatile product with conc. H_(2)SO_(4)? NO_(2)^(-),NO_(3)^(-),Br^(-),I^(-),CI^(-),S_(2)O_(3)^(2-),B_(3)^(3-),CrO_(4)^(2-)

Answer»

<BR>

SOLUTION :`NO_(2)^(-),NO_(3)^(-),Br^(-),I^(-)`
Discussion
33.

Which of the following reagents can be used to distinguished phenol and benzoic acid ?

Answer»

TOLLEN's reagent
Molisch reagent
NEUTRAL `FeCl_(3)`
Aqueous `NAOH`

SOLUTION :Neutral `FeCl_(3)` FORMSA violet coloured complex with phenol while benzoic acid gives a buff coloured precipitate.
Discussion
34.

What are the general conditions for liquification of a gas?

Answer»

Solution :Conditions for LIQUIFICATION of a gas are:
1) LOW TEMPERATURE and
2) HIGH pressure.
Discussion
35.

Which is the basic building unit of all silicates ?

Answer»

SOLUTION :`SiO_(4)^(4-)`is the basicbuilding UNIT of all SILICATES .
Discussion
36.

Which of the following pairs will form the most stable ionic bond?

Answer»

NA and F
Fe and Cl
N and O
LI and I

ANSWER :A
Discussion
37.

Which of the following statement are not correct ?

Answer»

The standard value of absolute entropy of elementarysubstances is taken as zero.
Work done in isothermal EXPANSIONIS GREATER than that in the adiabatic expansionfor same increase in volume.
During adiabatic expansion of a real GAS,there is no change in the enthalpy of the system.
Expansion against vaccum is very large and hence work done is also very large

Solution :The standard value of absolute entropy of even elementary substance is not zero. It has a definite value. Hence, (a) is wrong.For expansion against vaccum, `P_(EXT) = 0`. So, work done is zero. Hence, ( d) is wrong. \
Discussion
38.

Which is the most stable carbonium ion?

Answer»

`CH_(3)CH_(2)^(+)`
`C^(+)H_(3)`
`(CH_(3))_(3)C^(+)`
`(CH_(3))_(2)C^(+)H`

ANSWER :C
Discussion
39.

Which of the following transitions will have minimum wavelength ?

Answer»

`n_4 to n_1`
`n_2 to n_1`
`n_4 to n_2`
`n_3 to n_1`

SOLUTION :`1/lambda =R(1/(n_1^2) - 1/(n_2^2))`
Discussion
40.

Wax is an example of

Answer»

IONIC CRYSTAL
covalent
molecular crystal
amorphous solid

ANSWER :C
Discussion
41.

The solubility product for silver choride is 1.2xx10^(-10) at 298 K. Calculate the solubility of silver chloride at 298 K.

Answer»

Solution :Silver chloride dissociates according to theequation :
`AgCl(s) hArr AgCl(aq) hArr AG^(+) (aq) + CL^(-)(aq)`
LET s be the solubility of AgCl in moles per litre.
Consequently, the molar concentration of `Ag^(+) and Cl^(-)` will also be s each. Substituting in the expression for solubilityproduct of AgCl,
`K_(sp)=[Ag^(+)][Cl^(-)]=s xx s =s^(2)`
But `K_(sp)= 1.2xx10^(-10) ` (Given) `:. s^(2)=1.2xx10^(-10) or s = sqrt(1.2xx10^(-19))=1.1xx10^(-5) "mol " L^(-1)`
Discussion
42.

Which of the following oxidation states are the most characteristic for lead and tin. respectively ?

Answer»

`+2,+4`
`+4,+4`
`+2,+2`
`+4,+2`

ANSWER :A
Discussion
43.

Which of the following species are not known ?

Answer»

`[SiCl_(6)]^(2-)`
`[CF_(6)]^(2-)`
`[PbCl_(6)]^(2-)`
`[SiF_(6)]^(2-)`

Solution :Carboncannot expandits covalencybeyond4. Si, however,can have a cooridnationnumber ofbut DUE to sterichindrance of 6 big sized CL ATOMS and weakinteractionbetween lone pairs ofCland `Si`ATOM, `[SiCl_(6)]^(2-)`is not known. Thus, correctoptions are (a) and (b).
Discussion
44.

Write the favourable factors for the formation of ionic bond .

Answer»

Solution :(i) Low ionization enthalpy of the metal atom.
(II)HIGH electron GAIN enthalpy of the non-metal atom.
(iii) High lattic enthalpy of the COMPOUND formed .
Discussion
45.

What would have happened to the gas if the molecular collisions were not elastic ?

Answer»

Solution :On every COLLISION, there would have been loss of energy. As a RESULT, the molecules would have slowed down and ultimately settle down in the VESSEL. Moreover, the pressure would have gradually reduced to ZERO.
Discussion
46.

Which of the following statement is/are true 1) PH_5 and BiCl_5 donot exist 2) p - d bond is present in SO_2 3) I_3^(+) has geometry 4) SeF_4 and CH_4 have same shape

Answer»

1,2,3
1,3
1 and 2
1,2,4

Solution :`SeF_4` has distrorted TRIGONAL bypyramidal & `CH_4` has TETRAHEDRAL
Discussion
47.

Which one is known as oleum ?

Answer»

`H_2SO_5`
`H_2S_2O_8`
`H_2SO_3`
`H_2S_2O_7`

ANSWER :D
Discussion
48.

What happens when CH_3Cl is heated at 570K in presence of Cu powder and Si ?

Answer»
Discussion
49.

Write redox reaction when zinc rod is kept in H_(2)SO_(4) solution.

Answer»

SOLUTION :`Zn_((s))^(+)+2H_((aq))^(+)toZN_((aq))^(+2)+H_(2(G))`
Discussion
50.

Which of the following contains intramolecular hydrogen bonding?

Answer»

ACETIC ACID
 o-nitrophenol
HYDROGEN fluoride
water

ANSWER :B
Discussion