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.

The cell constant of a conductivity cell is given by

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`lxxa`
`a/l`
`(1)/(lxxa)`
`l/a`

ANSWER :A::D
2.

The cell content (Z) of the unit cell of a h.c.p. space lattice is

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2
6
12
17

Solution :h.c.p. is the only one of the four (SIMPLE cubic, b.c.c., h.c.p. and c.c.p.) that has noncubic unit CELL. The unit cell is rectangular (Z = 2 as in b.c.c. as INDICATED below by dark LINES.
3.

The cell constant of a conductivity cell is ________.

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`L TIMES a`
`a/l`
`l/a`
`l^(2)/a`

ANSWER :C
4.

The cell constant of a conductivity cell_____

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CHANGES with CHANGE of electrolyte
changes with chagne of concentration of electrolyte
changes with temperature of electrolyte
remains CONSTANT for a cell

Answer :D
5.

The cell constant for an electrical conductivity cell having two electrodes of area A placed at a distance of l is expressed by

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`L//A`
`l^(2)//A`
`A//l`
`(1)/(Al)`

SOLUTION :As we know, conductivity (K) is reciprocal of RESITIVITY `(rho)`, ie.
`K = (1)/(rho)and rho = R(A)/(l) thereforeK+ (1)/(R)(1/A) or K=Gl/A`
where, G is conductance of the cell the quantity `(l/A)` is CALLED cell constant (R)
6.

The cell constant is the product of resistance and

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CONDUCTANCE
molar conductance
SPECIFIC conductance
specific RESISTANCE

ANSWER :C
7.

The cell constant of a conductivity cell______

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CHANGES with change of electrolyte
changes with change of concentration of electrolyte
changes with temperature of electrolyte
remains CONSTANT for a cell

Solution :* Cell constant`=(l)/(A)`, where, l=length of cell,
A=cross SECTIONAL area of cell.
* For each cell the VALUE of l and A is constant, which does not change, so the cell constant of cell does not change.
8.

The C Cl_4 and CHCl_3 can be distinguish by the action of :

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RNH_2+KOH (ALC.)
RCN+KOH(ALC.)
Hydrolysis
Burning in air

Answer :A
9.

The C=C bond length in ethylene is:

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1.34 `OVERSET@A`
1.20 `overset@A`
1.39 `overset@A`
1.54 `overset@A`

ANSWER :A
10.

The C-C bond length in ethane is:

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1.20 `OVERSET@A`
1.34 `overset@A`
1.54 `overset@A`
1.39 `overset@A`

ANSWER :A
11.

The cause of water pollution is due to :-

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Micro-organisms
Organic wastes
Pesticide
All of these

Answer :D
12.

The cause of ozone deplection is due to release of chlorine atoms into the stratosphere. The chlorine atoms come from the breakdown of chloroflurocarbons by ultraviolet radiation.

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ANSWER :A
13.

The cause of food spoilage

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PRESENCE of moisture
absence of moisture
presence of vitamin-C
presence of vitamin-B

Answer :A
14.

The cause of Brownian movement is:

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HEAT CHANGES in the liquid state
conventional currents
the impact of molecules of the DISPERSION medium on the colloidal particles
attractive forces between the colloidal particles and molecules of dispersion medium.

Answer :C
15.

The cations present in a slightly acidic solution are Fe^(3+), Zn^(2+) and Cu^(2+). The reagent that when added in excess to this solution would be identified and separated Fe^(3+) in one step is

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2 M HCl
6 M `NH_(3)`
6 M NAOH
`H_(2)S` gas

Answer :B
16.

The cations present inA are

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`K^(o+)` and `Na^(o+)`
`K^(o+)` and `NH_(4)^(o+)`
`NH_(4)^(o+)` and `FE^(2+)`
`(Mg)^(2+) and Na^(o+)`

SOLUTION :
17.

The cationic detergent that is used in hair conditioners is

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sodium DODECYLBENZENE sulphonate
sodium Iauryl sulphate
tetramethylammonium chloride
cetyltrimethyl ammonium BROMIDE

Solution :Cetyltrimethyl ammonium bromide POSSESS germicidal properties. Thus it is USED as a cationic detergent in HAIR conditioners.
18.

The cationic detergent that is used in hair conditioners is.

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SODIUM dodecy BENZENE Chloride
Sodium LaurylSulphate
Tetramethyl AMONIUM chloride
Cetyltrimethyl amonium bromide 

Answer :D
19.

The cation which is expected to act as ligand is:

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`Pb^(4+)`
`Ca^(2+)`
`K^(+)`
`TL^(+)`

Solution :`Tl^(+) "has ONE insert PAIR of"e^(-)AVAILABLE.`
20.

The cation which forms a yellow precipitate with potassium chromate in acetic acid is:

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`NH_4^+`
`BA^(2+)`
`CA^(2+)`
`Na^+`

ANSWER :B
21.

The cation present in chromyl chloride is _________.

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SOLUTION :`CrO_(2)^(2+)`
22.

The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as ......................................................

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SCHOTTKY DEFECT
F center
FRENKEL defect
non-stoichiometric defect

SOLUTION :Frenkel defect
23.

The cation gives +ve microcosmic salt (or) phsophate bead test Cu^(+2), Mg^(+2), Fe^(+2), Cr^(+3), Co^(+2), Zn^(+2), Al^(+3), Mg^(+2), K^(+), Ca^(+2), Ba^(+2)

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Solution :The CATION gives +ve microcosmic salt (or) phsophate BEAD TEST
`Cu^(+2), Mg^(+2), Fe^(+2), CR^(+3), Co^(+2), Zn^(+2), AL^(+3), Mg^(+2), K^(+), Ca^(+2), Ba^(+2)`
24.

The cathodic reaction of a Zn - MnO_2dry cell is represented as2 MnO_2(s) + Zn^(2+) + 2e = Zn MnO_4(s) .If there is 8.0 g MnO_2present in the cathodic chamber, how long will the cell function to supply 4 xx 10^(-3)ampere of current?

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Solution :`(4 XX 10^(-3) xx t(s))/(96500)= 8/87 , E_(MnO_2)= 87`
25.67 days
25.

The cation-anion bond have the largest amount of covalent character for:

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NaBr
SrS
CdS
BaO

Answer :C
26.

The cathodic reaction in electrolysis of dilute sulphuric acid with platinum electrode is :

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OXIDATION
Reduction
Both oxidation and reduction
Neutralization

Answer :B
27.

The cathodic reaction in electrolysis of dilute H_(2)SO_(4) with Pt electrode is

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REDUCTION
Both
Oxidation
Neutralization

Answer :A
28.

The cathode reaction : MnO_2 + NH_4^(+) + e^(-)to MnO(OH) + NH_3is applicable in

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VOLTAIC cell
dry cell
SECONDARY battery
button cell

ANSWER :B
29.

The cathode in Leclanche cell is _______.

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Zinc container
Spongy lead
Graphite ROD in contact with `MnO_(2)`
HgO mixed with graphite

Answer :C
30.

The catenation tendency of C, Si and Ge is the order GeltSiltC. The bond energies (in Kjmol^(-1)) of C-C, Si-Si and Ge-Ge bonds, respectively are

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`167, 180, 248`
`180, 167, 348`
`348, 167, 180`
`348, 180, 167`

SOLUTION :The more the bond ENERGY, the more is the CATENATION.
31.

The cathode in agalvanic cell and electrolytic cell is

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negatively CHARGED in both CASES
positively charged in both cases
positively charged in galvanic cell but negatively charged in an ELECTROLYTIC cell
negatively charged in a galvanic cell but positively charged in an electrolytic cell.

Solution :In galvanic cell, cathode is POSITIVE but in electrolytic cell , cathode is NEGATIVE .
32.

The catenation power of a 'N' in its compound where 'N' shows fractional oxidation state is 'X' .

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Solution :In `N_3H` - Nitrogen exihibits fractional OXIDATION state and CATENATION POWER is x = 3 `OVERSET(Theta)N=overset(o+)N=N-H`
33.

The catalytic hydrogenation is more easier in case of which alkene :

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ANSWER :B
34.

The catalytic decomposition of formic acid may take place in two ways: (I) HCOOH rarr H_(2)O+CO (II) HCOOH rarr H_(2)+CO_(2) The rate constant and activation energy for reaction (I) are 2.79xx10^(-3) min^(-1) at 237^(@)C and 12.0 kcal mol^(-1) respectively. (II) are 1.52xx10^(-4) min^(-1) at 237^(@)C and 24.5 kcal mol^(-1) respectively. Find out the temperature at which equimolar quantities of H_(2)O, CO, CO_(2) and H_(2) are formed. (R=2 cal K^(-1) mol^(-1))

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SOLUTION :N//A
35.

The catalytic decomposition of hydrogen peroxide is a ................. order reaction.

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zero
first
SECOND
third

Solution :The CATALYTIC decomposition of HYDROGEN peroxide is a first order REACTION.
36.

The catalytic behaviour of transition metals and their compounds is ascribed mainly due to

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their MAGNETIC behaviour
their unfilled d orbitals
their ABILITY to ADOPT variable OXIDATION states
their chemical reactivity

Solution :their ability to adopt variable oxidation states
37.

The catalytic activity of transition metals and their compounds is mainly due to

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their magnetic behaviour
their unfilled dorbitals
their ability to adopt variable oxidation state
their chemical reactivity

Solution :The transition metals and their COMPOUNDS are used ascatalysts. Because of the variable oxidation states theymay form INTERMEDIATE compound with one of thereadtants. These intermediate provides a new path withlowe activation ENERGY. `V_(2)O_(5)+SO_(2) to V_(2)O_(4)+SO_(3)`
`2V_(2)O_(4)+O_(2) to 2V_(2)O_(5)`
38.

The catalyticactivityy of transitionmetal isdue to

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THEFORMATIONOF a VARIETYOF OXIDATION STATE
theformationof intermediateproducts
thecapabilityof forminginterstitialcompounds
all the above

ANSWER :D
39.

Thecatalyticbehaviourof transitionmetalsand theircompounds isascribedmainlydueto

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theirmagneticbehaviour
theirunfilledd orbitals
theirability toadoptvariableoxidationstates
theirchemicalreactivity

ANSWER :C
40.

The catalytic activity of transition metals and their compounds is ascribed mainly to

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their ability to ADOPT variable oxidation STATES
their chemical reactivity
their magnetic behaviour
their unfilled d-orbitals

Solution :The catalytic activity of transitiion metals and their compounds is ASCRIBED mainly to their ability to adopt variable oxidation states DUE to which theyeasily absorb and re-emit wide rangeof energies to provide the NECESSARY activation energy.Also,because of the variable oxidation states, they easily combine with one of the reactantsto form an intermediate which reacts with the secondreactant to formthe final products.
41.

Catalytic activity of transition elements and their compounds is due to their

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their magnetic behaviour
their UNFILLED d-orbitals
their ability to adopt variable oxidation STATES
their chemical reactivity

Answer :C
42.

The catalysts which increase the rate of reaction are called……….. Catalysts.

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SOLUTION :POSITIVE
43.

The catalyst used to increase the dissociation of H_(2)O_(3) is

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ACETANILIDE
GLYCEROL
`H_(3)PO_(4)`
CAUSTIC soda

Answer :D
44.

The catalyst used in the preparation of high density polyethylene is

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`N_2`
`(C_2H_5)_3Al+TiCl_4`
`Pd.BaSO_4+"QUINOLINE"`
`H_2+Ni`

ANSWER :B
45.

The catalyst used in the preparation of red from yellow P is :

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`I_2`
Ni
Zno
Fe

Answer :A
46.

The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is

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anhydrous `AlCl_(3)`
`FeCl_(3)`
anhydrous `ZnCl_(2)`
Cu

Solution :Primary and secondary alkyl chlorides are prepared from the RESPECTIVE alcohols by using HCl gas and anhydrous `ZnCl_(2)` (GROOVE's process).
Note : Tertiary alcohols are very reactive and hence they react READILY with conc. HCl even in the absence of `ZnCl_(2)`.
47.

The catalyst used in the manufacture of sulphuric acid by contact process is:

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Platinished asbosios
`Fe_2O_3`
`V_2O_5`
All

Answer :D
48.

The catalyst used in the manufacturer of HNO_3 by Ostwald.s process is:

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PLATINUM black
Finely DIVIDED nickel
Vanadium pentoxide
Platinum gauze

Answer :D
49.

The catalyst used in the manufacture of polythene by Zeigler method is:

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TITANIUM TETRACHLORIDE and TRIPHENYL aluminum
Titanium tetrachloride and TRIETHYL aluminum
Titanium dioxide
Titanium isoperoxide

Answer :B
50.

The catalyst used in the manufacture of polyethane by Zeigler method is :

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TITANIUM TETRACHLORIDE and TRIPHENYL aluminium
Titanium tetrachloride and trimethyl aluminium
Titanium dioxide
Titanium isoperoxide

Answer :B