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 solubility of Ba_3(AsO_4)_2(formula weight=690 )is 6.9 xx 10^(-2)g//100 ml. what is the K_(sp)?

Answer»

`1.08 xx 10^(-11)`
` 1.08 xx 10^(-13)`
` 1.0 xx 10^(-15)`
` 6.0 xx 10^(-13)`

Solution :`S= 6.9 xx 10^(-2)gm // 100ml `
` =(6.9xx10 ^(-2))/( 690 )mol //100 ML `
` = 10 ^(-4)" mole " //100ml `
`therefore 100ml -10 ^(-4)"mole " `
` 100 ml -10 ^(-4)" mole " `
`rArr 10 ^(-3)" moles" rArr K_(Sp) =108 S^(5) `
Discussion
2.

Which of the following hydrocarbons is not formed when Wurtzreaction takes place between ethyl iodide and propyl iodide

Answer»

BUTANE
Propane
Pentane
Hexane

SOLUTION :Alkane with odd NUMBER of carbon atoms
Discussion
3.

Which of the followin compound(s) on treatment with HCl forms a stable salt which can be separated and analyzed using AgNO_(3).

Answer»




SOLUTION :C and D FORM AROMATIC CATIONS after protanation.
Discussion
4.

Which compound gives beta-elimination reactions ? What are their main product ?

Answer»

SOLUTION :(i) ALKYL HALIDE (II) alcohol compounds gives `beta` -ELIMINATION reaction. Alkene is the main product of this reaction.
Discussion
5.

To prepare a pure sample of n-hexane, using sodium metal as one of the reactant, the other reactant(s) will be

Answer»

ETHYL CHLORIDE and n-butyl chloride
methyl BROMIDE and n-pentyl bromide
n-propyl bromide
ethyl bromide and n-butyl bromide.

ANSWER :C
Discussion
6.

The weight of 0.1 mole of Na_(2)CO_(3) is

Answer»

106g
10.6g
5.3g
`6.02 XX 10^(22)G`

Answer :B
Discussion
7.

what type of substances would make better peremanent magnets, ferromagnetic or ferrimagnetic ?

Answer»

SOLUTION :Ferromganetic SUBSTANCES would make better PERMANENT MAGNETS.
Discussion
8.

When lithium is irradiated with light, one finds a stopping potential of 1.83V for lambda = 3000A^@ and 0.80V for lambda = 4000A^@. With the known charge on the electron, the work function of lithium is

Answer»

4.6eV
`3.68xx10^(-19) J`
`2.3 EV`
`1.2 eV`

SOLUTION :`(hC)/(lambda_1) = W_0 = KE_1 , (hC)/(lambda_2) = W_0 + KE_2`
`therefore W_0 = 2.3 eV`
Discussion
9.

The RMS velocity of a gas at 0°C is 2m/s. The RMS velocity of the same gas at 819°C

Answer»

`1 m//s`
`4 m//s`
`8 m//s`
`16 m//s`

Answer :B
Discussion
10.

Which of the following is not a homgeneous mixture.

Answer»

AIR
BRASS
SOLUTION of sugar in WATER
Smoke

Solution :Smoke is hetrogeneous MIXTURE
Discussion
11.

The weakest base among the following is

Answer»

`C_(6)H_(5)SO_(3)^(-)`
`C_(2)H_(5)O^(-)`
`C_(6)H_(5)O^(-)`
`CH_(3)-CH=CH-CH_(2)-O^(-)`

Answer :A
Discussion
12.

Which method is used to make water germ free effectively and rapidly?

Answer»

PASSING `Cl_2`
Passing OZONE gas
By boiling
None of these

Solution :Passing Ozone
Discussion
13.

The specific heat of a liquid was measured by placing 100 g of the liquid in a calorimeter. The liquid was heate by an electric immersion coil. The heat capacity of the determined to be 31.4 J//K. With the 100g sample placed in the calorimeter, a current of 0.5 ampere was passed through the immersion coil for exactely 3 minutes. the voltage across the terminal of coil was measure to be 1.50 V. the temperature of the sample rose by 0.8^(@)C. find the specific capacity of liquid.

Answer»


ANSWER :`1.37 J//g-K`
Discussion
14.

Write the structures of the following : (i) But-2-en-1-ol (ii) 2-Aminoethan-1-ol (iii) 2, 4-Dimethylhexan-3-one (iv) 1, 3-Diaminopropane (v) 4-Ethyl-2, 4-dimethylhexane (vi) 5-(1, 2-Dimethylpropyl) nonane.

Answer»

SOLUTION :(i) `CH_(3)-CH=CH-CH_(2)-OH`
(ii) `HO-CH_(2)-CH_(2)-NH_(2)`
(iii) `{:(""O),("||"),(CH_(3)-CH-C-CH-CH_(2)-CH_(3)),("|""|"),(""CH_(3)""CH_(3)):}`
(iv) `H_(2)N-CH_(2)-CH_(2)-CH_(2)-NH_(2)`
(v) `{:(""CH_(3)),("|"),(CH_(3)-CH-CH_(2)-C-CH_(2)-CH_(3)),("|""|"),(""CH_(3)""C_(2)H_(5)):}`
(vi) `{:(CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH-CH_(2)-CH_(2)-CH_(2)-CH_(3)),("|"),(""CH-CH_(3)),("|"),(""CH-CH_(3)),("|"),(""CH_(3)):}`
Discussion
15.

What are the anomalies of the long form of periodic table?

Answer»

Solution :The long form of periodic table need clarification about the following:
(i) Position of hydrogen is not defined till now.
(II) Lanthanides and actinides STILL find PLACE in the BOTTOM of the table.
Discussion
16.

Which of the following test can be used for identification of 1^(@) amine ?

Answer»

Carbylamine test
Hofmann mustard OIL reaction
`NaNO_(2)//HCL`
FEHLING's SOLUTION

Answer :A::B::C
Discussion
17.

Which of the following is not a similarly of beryllium with aluminium?

Answer»

It BECOMES passive when TREATED with conc. `HNO_(3)`.
It forms polymerric covalent hydrides
Carbonate of Be is EXTREMELY stable
saltts of Be do not impart colour to the flame.

Answer :C
Discussion
18.

Total number of alpha - hydrogen in the following compound is

Answer»


ANSWER :6
Discussion
19.

Which property of liquid is responsible shape of liquid drops ?

Answer»

SOLUTION :SURFACE TENSION and VISCOISTY.
Discussion
20.

Which of the following alkali metals when burnt in air forms a mixture of oxide as well as nitride?

Answer»

K
Na
Li
Cs

Solution :Lithium when BURNT in air forms a MIXTURE of oxide as well as nitride.
`4Li+O_(2) OVERSET(Delta)to 2Li_(2)O,6Li+N_(2) overset(Delta)to 2Li_(3)N`
Discussion
21.

Which is the incorrect statement ?

Answer»

`FeO_0.98` has non-stoichiometric metal deficiency DEFECT
Density decreases in case of crystals with Schottky's defect
NaCl(s) is insulator , SILICON is semiconductor, SILVER is conductor , quartz is piezoelectric crystal
Frenkel defect is favoured in those ionic compounds in which the sizes of cations and ANIONS are almost equal

Solution :Non-stoichiometric ferrous oxide is `Fe_(0.93-0.98) O_1.00` ( and not `FeO_0.98`) which is DUE to metal deficiency defect. Hence, (a) is incorrect. Frenkel defect is favoured in those ionic compounds in which sizes of cation and anion are largely different . Hence (d) is incorrect.
Discussion
22.

Whichtwo elements of the followingbelong to thesameperiod ? A1 , Si , Baand O.

Answer»

SOLUTION :A1 and SI.
Discussion
23.

The velocity of a gas molecule present in a cubic vessel in X-direction is 1000 cm / sec. The side of that cubic vessel is 10 cm. The number of bombardments made by the molecule on one face in X-direction in one second is

Answer»

200
400 
25 
50 

ANSWER :D
Discussion
24.

When does Z = 1 ?

Answer»

SOLUTION :`Z=(pV)/(NRT)`
If `Z =1to pV = nRT`
If GAS is IDEAL then Z = 1.
Discussion
25.

Which one known as ODS ?

Answer»

CFC
BROMO Flouro CARBON
Both (A) and (B)
Oxyflouro carbon

Solution :Both (A) and (B)
Discussion
26.

The two elements which react with air readily are

Answer»

B
AL
Ga
TL

Solution :Al and Tl REACT READILY with AIR.
Discussion
27.

Zeolite used to soften hardness of water is hydrated:

Answer»

POTASSIUM ALUMINIUM borate
Sodium aluminium silicate
Calcium aluminium silicate
Zinc aluminium silicate.

Solution :(B) is the CORECT ANSWER
Discussion
28.

Which of the following does not show geometrical isomerism ?

Answer»

1,2 - dichloro - 1 - PENTENE
1,3 - dichloro - 2 - pentene
1,1 - dichloro - 1 - pentene
1,4 - dichloro - 2 - pentene

Answer :C
Discussion
29.

Which graph of Moseley suggests that properties of elements depend upon atomic number?

Answer»

`v^(2) to Z `
`sqrt v to Z`
`v^(2) to A`
`sqrt v to A`

Solution :In 1913, the English physicist Henery Moseley observed regularity in the characteristics of X-ray spectra of elements. He plotted graph `sqrt v ( v =` frequency of X-ray) against atomic number, which was found to be a straight LINE. This indicated that atomic number was the fundamental PROPERTY and not the atomic weight.
As a result periodic law of Mendleev was corrected by putting the word atomic number. instead of .atomic weight. "The physical and CHEMICAL PROPERTIES of elements are periodic function of their atomic numbers" is modern periodic law.
Discussion
30.

What is the coordination number of (i)sodium in sodium oxide (Na_2O) ? (ii)oxide ion in sodium oxide (Na_2O) ? (iii)calcium in calcium fluoride (CaF_2) ? (iv)zinc in zinc blende (ZnS) ?

Answer»

SOLUTION :(i)4 , (ii)8 , (iii)4 , (IV)4
Discussion
31.

Thermodynics is no concerned about "…............".

Answer»

ENERGY changes involved in a CHEMICAL REACTION.
the EXTENT to which a chemical reaction proceeds.
the rate at which a reaction proceeds.
the feasibility of a chemical reaction.

SOLUTION :Thermodynamics is not concerned with the rateat which a reaction proceeds.
Discussion
32.

Which of the folowing represent Z or trans?

Answer»




SOLUTION :N//A
Discussion
33.

The strenth of 10 volume of H_(2)O_(2) solution is :

Answer»

10
68
`60.70`
`30.36`

Solution :10 volume `H_(2)O_(2)` means, 1 LITRE of `H_(2)O_(2)` will give 10 litre oxygen at STP.
`underset(68 g)(2H_(2)O_(2))to 2H_(2)O_underset(22.4 " L at STP")(O_(2))`
`because 22.4 L O_(2)` is OBTAINED at STP from `68 g H_(2)O_(2)`
`therefore L O_(2)` is obtained at STP from `(68)/(22.4)xx10 g H_(2)O_(2)`
=30.36 g
Thus, strength of `H_(2)O_(2)=30.36 g//L`.
Discussion
34.

What is the coordination number in a square close packed structure in two dimensions ?

Answer»

2
3
4
6

Answer :C
Discussion
35.

Which one of the following can not act as nucleophile?

Answer»

`CH_(3)OH`
`RNH_(2)`
`CH_(3)OCH_(3)`
`CH_(3)CH_(2)NO_(2)`

ANSWER :D
Discussion
36.

Which of the following reaction produce dihydrogen from synthesis gas?

Answer»

`CH_(4)(g)+H_(2)O(g) UNDERSET(NI)overset(1270K)(rarr)CO(g)+3H_(2)(g)`
`C(s)+H_(2)O(g) overset(1270K)(rarr)CO(g)+H_(2)(g)`
`CO(g)+H_(2)O(g) underset("Cat")overset(673K)(rarr)CO_(2)(g)+H_(2)(g)`
`C_(2)H_(6)+2H_(2)O underset(Ni)overset(1270K)(rarr)2CO+5H_(2)`

ANSWER :C
Discussion
37.

When Friedel-Crafts alkylation of benzene is carried out with n-propyl bromide, the major product is

Answer»

n-propylbenzene
isopropylbenzene
2-ethylbenzene
none of the above

SOLUTION :
Discussion
38.

Which of the following solvents are aprotic?

Answer»

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

Solution :`SO_(2) and CH_(3)CN` can neither donate PROTONS nor acceptprotons. HENCE, they are aprotic.
Discussion
39.

Which of the following statement is/are correct?

Answer»

The conjugate acid of `NH_(2^((-)))` is `NH_(3)`
Kxp increases with increases in concentration of ions
on dilution of a buffer solution, `p^(H)` change is negligible
In alkaline buffer solution, if some `HCl` is added it's `[OH^(-)]` will increase

Solution :Statement A is correct.
`K_(a)` values decrease successively since it is difficult to remove `H^(o+)` ion from an anion thatn a netural compound. Similarly, it is difficult to remove `H^(o+)` ion from an dianion than an anion.
HENCE `K_(a_(1)) gt K_(a_(2)) gt K_(a_(3))`
B. Statement B is incorrect.
`H_(3)PO_(4) overset(K_(a_(1)))hArrH^(o+)+H_(2)PO_(4^(T))`
`H_(2)PO_(4^(T))overset(K_(a_(2)))hArrH^(o+) + HPO_(4^(2-))`
`pH(H_(2)PO_(4^(T))) = (pK_(a_(1)) + pK_(a_(2)))/(2)`
This is valid only when `H_(3)PO_(4)` during titrating is completely CONVERTED to `H_(3)PO_(4)^(T)`.
`HPO_(4^(2-)) overset(K_(a_(2)))hArrH^(o+) + PO_(4^(3-))`
`pH(HPO_(4)^(2-))= (pKa_(2) + pKa_(3))/(2)`
This is again valid when starting with `H_(2)PO_(4)^(2-)` and is completely converted to `HPO_(4)^(2-)`
C. Statement C is correct
From the `K_(a)` values it is evident that both `H_(3)PO_(4)` and `H_(2)PO_(4^(T))` are more acidic than `HPO_(4^(2-))`
Statement D is incorrect.
Both `H_(2)PO_(4^(T))` and `HPO_(4^(2-))` are amphoprotic anion in the solution.
`H_(3)PO_(4)overset(+H^(o+))larrH_(2)PO_(4^(T))overset(-H^(o+))rarrHPO_(4)^(2-)+H^(o+)`
`H_(2)PO_(4^(T)) overset(+H^(o+))larrHPO_(4)^(2-)overset(-H^(o+))rarrPO_(4^(3-))+H^(o+)`
Discussion
40.

What are inner transition elements ?

Answer»

Solution :The ELEMENTS in which extra electron enters (n-2) f- orbitals are called f- BLOCK elements . Theseelements form a transition SERIES within the transition elements . So these elements are called as inner transition elements.
Discussion
41.

Total number of nodes (planar and spherical) present in the 5f-orbital is

Answer»


Solution :Total no. of nodes present in 5F ORBITAL `= n-1 = 5 - 1 = 4`
Discussion
42.

Which is the radioactive element in group 1 element? What is its half-life period?

Answer»

Solution :Francium is highly RADIOACTIVE ELEMENT in GROUP. It has half-life of only 21 MINUTES.
Discussion
43.

What happens when p-xylene is treated with concentrated sulphuric acid and the resultant product is fused with KOH and finally dilute acid is added?

Answer»

SOLUTION :.
Discussion
44.

When phenyl magensium bromide reacts with tert butanol, which of the following is formed?

Answer»

tert-Butyl methyl ether
Benzene
tert-Butyl benzene
Phenol

Solution :To supress substitution and to facour elimination, the ACID used must have a non-nucleophilic counter ION. The counter ion of `HCl` or `HCl//ZnCl_(2)` or `HBr`, i.e., `Cl'` or `Br'` ion is a strong NUCLEOPHILE and thus FORMS either cylohexyl bromide by substitution reaction. In contrast, the counter ion of `H_(3)PO_(4)` i.e., `PO_(4)^(3-)` is non-nucleophilic and hence does not give substitution , i.e., cyclohexane.
Discussion
45.

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

Answer»

ACID ANHYDRIDE `gt` Amide `gt` ESTER `gt` Acyl CHLORIDE
Acyl chloride `gt` Ester `gt` Acid anhydride `gt` Amide
Acyl chloride `gt` Acid anhydride `gt` Ester `gt` Amide
Ester `gt` Acyl chloride `gt` Amide `gt` Acid anhydride

Answer :C
Discussion
46.

The weakest acid among the following

Answer»

`CH_(3)COOH`
`CH_(3)CO_(2)OH`
`Cl-CH_(2)-COOH`
`CH_(3)-CH_(2)-COOH`

SOLUTION :`CH_3CO_2OH`
Discussion
47.

Write the chemical equations when sodium fusion extract is prepared from an organic compound containing nitrogen and sulphur.

Answer»


ANSWER :`Na+C+NtoNaCN`
`2Na+StoNa_(2)S`
Discussion
48.

The R_(f) values of A and B in a mixture determined by TLC in a solvent mixture are 0.65 and 0.42 respectively. If the mixture is separated by column chromatography using the same solvent mixture as a mobile phase, which of the two components, A or B, will elute first? Explain.

Answer»

Solution :Since the `R_(F)` value of A is 0.65, therefore, it is less strongly adsorbed as compared to component B with `R_(f)` value of 0.42. Therefore, on extraction of the COLUMN, A will elute first.
Discussion
49.

The stoichiometric coefficients do not represent

Answer»

RELATIVE NUMBER of molecules of the rectants and products
relative number of moles of the REACTANTS and products
relative volumes of each gaseousrectantand productunder the indentical condtions of TEMPERATUREAND pressure
the relative mass of rectants and products

Solution :1 mol is a fixed numberof formula units but not a fixed mass.
Discussion
50.

When acetaldehyde is treated with Fehling's solution, it gives a precipitate of

Answer»

CU
CUO
`Cu_(2)O`
`Cu^(+)+Cu_(2) + CuO`

ANSWER :C
Discussion