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.

Who refined the Lewis concept ?

Answer»

SOLUTION :LEWIS & LANGMUIR.
Discussion
2.

The vapour density of a gas is 11.2. The volume occupied by 10g of the gas at STP is

Answer»

10 L 
1 L 
11.2 L 
5.6 L 

ANSWER :A
Discussion
3.

whichof thefollowingis TRUEaboutcommercialproductionofcaliumoxide?

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Stakedlimeis usedas reactant
THETEMPERATUREIS MAINTAINEDAT arpund773 K .
As soon as thebyproductis formed, isremovedto enblethe reactiontoprocedto completion
All of these

Answer :C
Discussion
4.

Which of the following is sparingly soluble salt ?

Answer»

`BaSO_4`
`CDS`
PbS
NaCl

Answer :D
Discussion
5.

Which of the following reagent is helpful to diferentiate ethylene dichloride and ethylidene chloride?

Answer»

Zn/methanol
KOH/ ETHANOL
AQUEOUS KOH
`ZnCl_2//conc.HCl`

SOLUTION :Aqueous KOH
Discussion
6.

Write the structures and names for all the possible isomers of benzene derivativeshaving the molecular formulae : (a) C_(8)H_(10), (b) C_(9)H_(12), ( c) C_(2)H_(2)F_(4).

Answer»


ANSWER :`(##GRB_ORG_CHM_P1_C08_E01_007_S01##)`
Discussion
7.

What is the volume ratio of equal masses of hydrogen,methane and oxygen present under similar conditions?

Answer»


ANSWER : 16 : 2:1
Discussion
8.

What is the effect of heat on the following compounds? a. Magnesium chloride hexahydrate b. Gypsum c. Magnesium sulphate heptahydrate

Answer»

SOLUTION :a. `MgCl_(2).6H_(2)Ooverset(Delta)(to) Mg(OH)Cl+HCl+5H_(2)O`
(b)`CaSO_(4).2H_(2)Ooverset(120^(@)C)(to)CaSO_(4)1/2H_(2)O+3/2H_(2)O` (plaster of PARIS)
(c)`MgSO_(4).7H_(2)Ooverset(473K)(to)MgSO_(4)+7H_(2)O`
Discussion
9.

Which transition between Bohr orbits corresponds to third line in the Balmer series of the hydrogen spectrum

Answer»

SOLUTION :5TH ORBIT to 2ND orbit
Discussion
10.

When 100 ml of N/10 NaOH are added to 50 ml of N/5 HCI, the P^(H)of the resulting solution is

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`7`
GREATER than 7
LESS than 7
ZERO

SOLUTION :` N_aV_a =N_bV_b`
Discussion
11.

Which of the following statement is correct for Fullerene ?

Answer»

There are twenty rings having five carbon atoms in Fullerene.
Fullerene possesses molecular STRUCTURE.
In Fullerene, carbon atom has `sp^3` hybridization.
Fullerene is the SYNTHETIC AMORPHOUS form of carbon.

Solution :(A) There are twelve rings of 5 carbon atom is PRESENT in fullerene, so (A) is not true.
(C) Each carbon atom combines with other three carbon atoms with `sigma`-bond. The remaining electrons forms `pi`-bond and hence, carbon possess `sp^2` hybridization, so (C) is not true.
(D) Fullerene is crystalline form of fullerene, so (D) is not true.
(B) Fullerene possesses `C_(2n)` type of moelcular structure.
Discussion
12.

The role of starch in iodometric titrations is that

Answer»

it ACTS an oxidant
it is REDUCING agent
it acts as INDICATOR
it is a medium

Answer :C
Discussion
13.

Which of the following are the common oxidising agents used in redox titrations ?

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`K_(2)Cr_(2)O_(7), KMnO_(4)`, Iodine
`FeSO_(4), KMnO_(4)`, Sodium thiosulphate
Oxalic acid, `KMnO_(4), CuSO_(4)`
Mohr's salt, KI, Sodium sulphate

Solution :`K_(2)Cr_(2)O_(7),KMnO_(4)` and iodine are used as oxidising AGENTS for redox TITRATION
Discussion
14.

Write the resonance structures for N_(2)O

Answer»

SOLUTION :Nitrous OXIDE `N_(2)O` :
`UNDERSET(..)overset(..)N = N =underset(..)overset(..)O hArr :underset(..)overset(..)N = N = O: :N = N = underset(..)overset(..)O:`
Discussion
15.

Which one of the following is an electron deficient compound?

Answer»

1) `Al_(2)Cl_(6)`
2) `AlBr_(3)`
3) `SF_(6)`
4) `BF_(3)`

Solution :`BF_(3)`
Discussion
16.

Z the position number of NO_(2) Group X,Y,Z aer P,Q,R respectively. The value of P+Q+R is

Answer»


SOLUTION :
Discussion
17.

What happens to the ph of a solution of Acetic acid when some sodium acetate is dissolved in it? Explain.

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SOLUTION :`pH` of the ACID solution increases.
Because of COMON ion effect dissociation of acetic acid DECREASED and henc `[H^(+)]` DECREASES.
Discussion
18.

Which compound will yield 5-keto -2-methyl hexanal upon treatment with O_3 ?

Answer»




SOLUTION :
Discussion
19.

Which of the following reactions is not an electrophilic addition reactions -

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Solution :REACTION A is free radical ADDITION and all are ELECTROPHILIC addition reactions.
Discussion
20.

What is stone leprosy? How is it formed?

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SOLUTION :The attack on the marble of BUILDINGS by acid rain is called stone LEPROSY
(ii) Acid rain causes EXTENSIVE damage to buildings MADE up of marble.
`CaCO + H_(2)SO_(4)to CaSO_(4) + H_(2)O + CO_(2)uarr`
Discussion
21.

Which of the following is an example of homogeneous equilibrium ?

Answer»

`H_(2) O (l) hArr H_(2) O (g)`
`CaCO_(3) (s) hArr CaO (s) + CO (g)`
`H_(2) (g) + I_(2) (g) hArr 2 HI (g)`
`2 CO(g) hArr CO_(2) (g) + C(s)`

SOLUTION :Here all reactants and products are in same phase i.e., GASEOUS phase .
Discussion
22.

The standard enthalpies of combustion of C_(6)H_(6)(l), C("graphite") and H_(2)(g) are respectively -3270 kJ"mol"^(-1), -394 kJ"mol"^(-1) and -286 kJ"mol"^(-1). What is the standard enthalpy of formation of C_(6)H_(6)(l) in kJ"mol"^(-1)?

Answer»

`-48`
`+48`
`-480`
`+480`

Solution :(i) `C_(6)H_(6)(l) + 15/2O_(2)(g) to 6CO_(2)(g) + 3H_(2)O(l)DeltaH = -3270 kJ"mol"^(-1)`
(II) `C(gr) + O_(2)(g) to CO_(2)(g) DeltaH = -394 kJ"mol"^(-1)`
(iii) `H_(2)(g) + 1/2O_(2)(g) to H_(2)O(l) DeltaH = -286 kJ"mol"^(-1)`
The required equation is
(iv) `6C(gr) + 3H_(2)(g) to C_(6)H_(6)(l),DeltaH` = ?
Multiply eq.(ii) by 6 and eq(ii) by 3 and adding we get :
(v) `6C(gr) + 15/2O_(2)(g) + 3H_(2)(g) to 6CO_(2)(g) + 3H_(2)O(l), DeltaH = -3222 kJ`
Subtract eq.(i) from eq.(v)
`6C(gr) + 3H_(2)(g) to C_(6)H_(6)(l) DeltaH = + 48 kJ"mol"^(-1)`.
Discussion
23.

The standard enthalpy of formation of FeO and Fe_(2)O_(3) is -65kcal mol^(-1) and -197kcal mol^(-1) respectively. A mixture of two oxides contains FeO and Fe_(2)O_(3) in the mole ratio 2:1. If by oxidation, it is changed into a 1:2 mole ratio mixture, how much of thermal energy will be released per mole of initial mixture ?

Answer»


ANSWER :`-13.4kcal MOL^(-1)`
Discussion
24.

Which one of the following is not paramagnetic-

Answer»

`O_(2)`
`B_(2)`
`NO`
`CO`

Solution :There is no unpared ELECTRON in MO electronic configuration of CO molecule. Thus, it is not PARAMAGNETIC.
Discussion
25.

What is bond order according to Lewis ? Write structure and bond order of H_(2) , O_(2) ,N_(2), CO, NO.

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Solution :In the LEWIS DESCRIPTION of covalent BOND the Bond Order is given by the number of bonds between the two ATOMS in a molecule.
Discussion
26.

Which of the following reactions is an example ofredox reactions ?

Answer»

`XeF_(4) + O_(2) F_(2) RARR XeF_(6) + O_(2)`
`XeF_(2) + PF_(5) rarr [XeF]^(+) PF_(6)^(-)`
`XeF_(6) + H_(2) O rarr XeOF_(4) + 2HF`
`XeF_(6) + 2H_(2)O rarr XeO_(2) F_(2) + 4HF`

ANSWER :A
Discussion
27.

Which of the following orbitals will have zero probability of finding the electron in the yz plane ?

Answer»

<P>`p_(X)`
`p_(y)`
`p_(z)`
`d_(yz)`

Solution :`p_(x)` orbital LIES along x-axis, Hence, the probability of finding ELECTRON is zero in the yz plane
Discussion
28.

Which of the following gives Tollen 's test

Answer»

ACETYLENE and propyne
Formic acid
Acetaldehyde
All

Answer :4
Discussion
29.

Match List-I with List-II and select the correct option.

Answer»

P, R
Q, R
S, P
R, Q

Solution :Propane has more conformational energy as COMPARE to ethane. In eclipsed CONFORMATION of ethane has more V.D.S. and torsional STRAIN so it LIES upper side in the P.E. diagram and staggtered conformation of propane has LESS V.D.S. so it lies lower side in P.E. diagram.
Discussion
30.

Which of the following has incorrect relation

Answer»




SOLUTION :
They are not ISOMERS MF is DIFFERENT.
Discussion
31.

Which of the following is not a general characteristic of equilibrium involving physical process?

Answer»

Equilibrium is possible only in a closed system at a given temperature
The OPPOSING processes occur at the same rate and there is a dynamic but stable condition
 All the PHYSICAL processes stop at equilibrium
All measurable PROPERTIES of the system remains constant

Solution :Solution: CORRECT statement: Physical processes OCCURS at the same rate at equilibrium.
Discussion
32.

Which of the following is less stable thermally-

Answer»

LiF
KCl
RbF
CsF

SOLUTION :Thermal stability of a COMPOUND increases with the increasing value of enthalpy of formation. Among the GIVEN compounds the value of enthalpy of formation is MINIMUM `(-428 kJ. Mol^(-1))` for KCl. Hence, it has the lowest thermal stability among the given compounds.
Discussion
33.

What are the uses of Beryllium?

Answer»

Solution :(i) Due its low atomic number and very low absorption for X-rays, it is used as radition windows for X-ray tubes and X-ray detectors.
(ii) The sample holder in X-ray EMISSION studies USUALLY made of beryllium
(III) Since beryllium is transparnet to energetic particles it is used to build the 'beam PIPE' in accelerators.
(IV) Because of its low density and diamagnetic nature, it is used in various detectors.
Discussion
34.

Which ofthe followingelementshas mostpositiveelectrongainenthalpy ?Fluorinenitrogen neon.

Answer»

SOLUTION :Bothnitrogenand neonhave positive electrongainenthalpies. Butneonhas muchhigherpositiveelectron gain enthalpy because of itsmuch morestable INERTGAS CONFIGURATION than the lessstableexactlyhalf-filledelectronicconfigurationof nitrogen.
Alternatively in NEON , the newelectronhas to beplacedin a muchhigherenergy 3S- orbital of the newshellwhilein case of N , thenewelectronis toplacedin the 2p-orbital of the sameshell.
Discussion
35.

Which gas effuses fastest under identical conditions?

Answer»

`N_(2)`
`O_(2)`
`Cl_(2)`
`CH_(4)`

ANSWER :d
Discussion
36.

Which statement is correct?

Answer»

It is the product of ionic concentration of a slightlysoluble salt in its saturated solution at a CERTAIN temp.
It MAY be used to calculate solubility of substance
If the product of ionic concentration of the IONS present in a solution EXCEED its solubility product. The compounds is precipitated out.
If its ionic product is equal to solubility product, the solution is maintained at saturated level.

Solution :DEFINITION of Ksp
Discussion
37.

When SO_2is passed in a solution of potassium iodate, the oxidation state of iodine changes from

Answer»

`+5 " to " 0`
`+5 " to " -1`
`-5 " to " 0`
`-7 " to " -1`

Solution :`overset(+5)(IO_3^(-))RARROVERSET(0)I_2`
Discussion
38.

Which of the following is a heterogeneous catalysis?

Answer»

`2C_(2)H_(5)OH OVERSET("Conc."H_(2)SO_(4))rarrC_(2)H_(5)OC_(2)H_(5)+H_(2)O`
`2CO+O_(2) overset(NO)rarrCO_(2)`
`SO_(2)+(1)/(2)O_(2) overset(NO)rarrSO_(3)`
`SO_(2)+(1)/(2)O_(2) overset(V_(2)O_(5))rarrSO_(3)`

Solution :In Homogeneous CATALYSIS all the reactants, PRODUCTS and the CATALYSTS have the same physical state.
Discussion
39.

Write suitable regent to distinguish the following compounds.

Answer»


ANSWER :Lucas reagent `(HCl//ZnCl_(2))` or NEUTRAL `FeCl_(3)`
Discussion
40.

Which of the following concentration terms is temperture independent (i) Molarity (ii) Molallity (iii) Normality (iv) Mole frection

Answer»

I & II
I& III
II only
II & IV

ANSWER :D
Discussion
41.

What is the role of CaO in sodalime ?

Answer»

SOLUTION : It HELPS in the FUSION of REACTION MIXTURE.
Discussion
42.

Which concept can justify that CaO + SO_(3) rarr CaSO_(4)is an acid-base reaction ?

Answer»

SOLUTION :LEWIS CONCEPT.
Discussion
43.

Which method is used to produce nitric acid ?

Answer»

SOLUTION :Ostwald.s METHOD.
Discussion
44.

The vapour pressure of any liquid is………………proportional to the magnitude of the intermolecular forces and is…………….proportional to the temperature employed.

Answer»

SOLUTION :INVERSELY, DIRECTLY
Discussion
45.

There is a collection of crystalline substances in a hexagonal close packing. If the density of matter is2.6 g//cm^(3), what would be the average density of matter in colleciton ? What fractionofthe space is actually unoccupied ?

Answer»

Solution :In hexagonal CLOSE packing, packingefficiency is 74 %
Density of matter= Packing FRACTION ` xx ` TOTAL density = ` 74/100 xx 2.6 = 1.924 " g/cm"^(3)`
% EMPTY space ( space unoccupied )= 100 - 74 = 26% .
Discussion
46.

Which of the following phenomena does not involve surface tension ?

Answer»

Mercury drops acquire SPHERICAL shape .
Liquids tend to rise in the capillary .
A liquids FLOWS over a fixed surface .
Moist soil grains are pulled together .

SOLUTION :Liquids tend to minimise their surface due to surface TENSION.
Discussion
47.

Which one is biodegradable substance ?

Answer»

Paper
Kitchen WASTES
Both (A) and (B)
PLASTIC

SOLUTION :Both (A) and (B)
Discussion
48.

Which one of the following contains most acidic hydrogen atom.

Answer»




ANSWER :D
Discussion
49.

What gas leaked to bring havoc in Bhopal tragedy ?

Answer»

SOLUTION :METHYLISOCYANATE (MIC).
Discussion
50.

Which group of elements in gases state in normal condition ?

Answer»

Solution :All the ELEMENTS of group `18^(th)` are in gases STATE (He, Ne, Ar, KR, Xe, Rn).
Discussion