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 is the difference inenergyof 2sorbitalsof hydrogenand 2sorbitalof otheratoms ?

Answer»

SOLUTION :Electronof 2SORBITAL of HYDROGEN `LT`electronof2sorbitalsof otheratom
Discussion
2.

Unknown compound (A) C_(5)H_(10)O gives positive test with 2,4-DNPbut negative test with Tollen's reagent . It also give yellow precipitate with I_(2)//NaOH. (A) is :

Answer»




ANSWER :B::C
Discussion
3.

When a mixture of anhydrous Na_2CO_3 and NaHCO_3is heated to 100^@C, a loss in mass is recorded. This is due to

Answer»

DECOMPOSITION of `Na_2CO_3` ALONE
decomposition of `NaHCO_3` alone
decomposition of both
removal of WATER of crystallisation

Solution :decomposition of `NaHCO_3` alone
Discussion
4.

The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can best be explained in terms of

Answer»

STERIC effect
hyper conjugation
electrometric effect
inductive effect

Solution :More `ALPHA` -HYDROGENS are PRESENT in 2,3 dimenthyl but-2-ene
Discussion
5.

Which of the following equations depict the oxidizing nature of hydrogen peroxide ?

Answer»

`MnO_(4)^(2-)toMn^(2+)`
`Fe^(3+)TOFE^(2+)`
`KItoI_(2)`
`KIO_(4)toKIO_(3)`

ANSWER :C
Discussion
6.

Which metals is present in chlorophyll? How does this metals react with N_(2) ?

Answer»

Solution :MG is pressent in chlorophyy. `N_(2)` REACTS with Mg to form MAGNESIUM NITRIDE.
Discussion
7.

The sun of the numbers of lone pairs of electrons on each central atom in the following species is …….. [TeBr_(6)]^(2-),[BrF_(2)]^(+), SNF_(3) and ]XeF_(3)]^(-) (Atomic number : N= 7, F=9 , S=16, Br=35, Te=52, Xe=54)

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SOLUTION :LONE PAIRS (Ip) = Total pairs (T) - Bond pairs (B)
In `[TeBr_(6)]^(2-) T = (1)/(2) (6 + 6 + 2 ) = 7 , B = 6 `
`thereforelp = 7 - 6 = 1 `
In `BrF_(2)^(+) , T= (1)/(2) = ( 7 + 2 - 1) = 4 , B = 2 `
` thereforelp = 4 - 2 = 2 `
In ` XeF_(3)^(-), T = (1)/(2) (8 + 3 + 1) = 6 , B = 3 `
`therefore lp = 3 `
STRUCTURE of `SNF_(3) ` is where S has zero
lone pair of electrons.
`{:("Species" ,[TeBr_(6)]^(2-), BrF_(2)^(+),SNF_(3), XeF_(3)^(-)),("Lone pairs",1,2,0,3):}`
on central
atom
Total number of lone pairs of electrons = 6
Discussion
8.

What are the demerties of long form periodic table.

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Solution :(i)POSITION of hydrogen is not defined till now.
(II)Lanthanides and actinides still FIND place in the bottom of the table.
Discussion
9.

Which of the following graph is related to Boyle.s law ?

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ANSWER :C
Discussion
10.

Which of the following hydrocarbons has the lowest dipole moment ?

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`CH_3C-=C CH_3`
`CH_3CH_2 C-=CH`
`CH_2=CH-C-=CH`

Solution :`CH_3C-=C CH_3` being linear and symmetrical has LOWEST (or zero) DIPOLE MOMENT.
Discussion
11.

Which of the following contains the maximum number of atoms?

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10g of `CaCO_(3)`
4g of hydrogen
9g of `NH_(4)NO_(3)`
1.8g of `C_(6)H_(12)O_(6)`

Solution :1) `10gCaCO_(3)=(10)/(100)=0.1` moles
`=0.1N_(0)` MOLECULES
`=0.1N_(0)XX5` atoms
2) `4gH_(2)=(4)/(2)=2" moles "=2N_(0)xx2` atoms
3) `9gNH_(4)NO_(3)=(9)/(80)=0.1125` moles
`=0.1125N_(0)xx9` atoms
4) `1.8gC_(6)H_(12)O_(6)=(1.8)/(180)=0.01` moles
`=0.01N_(0)xx24`
Discussion
12.

When heavy water reacts with calcium carbide, the product formed is

Answer»

Acetylene
Calcium hydroxide
Deuterium
Deutero acetylene

Answer :D
Discussion
13.

Which of the following involves gain of five electrons ?

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`MnO_(4)^(-) RARR Mn^(2+)`
`CrO_(4)^(2-) rarr Cr^(3+)`
`MnO_(4)^(2-) rarr MnO_(2)`
`Cr_(2)O_(7)^(2-) rarr 2Cr^(3+)`

Answer :A
Discussion
14.

Which of the following alcohols is most soluble in water?

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n-Butyl alcohol
Isobutyl alcohol
sec-Butyl alcohol
tert-Butyl alcohol

Solution :SOLUBILITY of alcohols in WATER increases with increase in their BRANCHING in alkyl GROUPS.
Discussion
15.

Which of the following statements are correct i) Both carbides of Be and Al react with water to produce methane gas ii) Be and Al dissolves in alkali to from berrylates and aluminates iii) Be forms many complexes when compared with remaining II_(A)- group elements.

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I, II are correct
ii, III, are correct
I, iii are correct
I, ii, iii are correct

Answer :D
Discussion
16.

What do you mean by electrovalence?

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SOLUTION :Number of IONS lost (GAINED) by ATOMS during the formation of IONIC bond.
Discussion
17.

Which elements are known as transition element and inner transition element ?

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SOLUTION :ELEMENT of d-block are known as transition ELEMENTS.
Elements of f-block are known as inner transition elements.
Discussion
18.

Which reducing agent, would you use to carry out the following transformation.

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`LiAIH_(4)`
`NaBH_(4)`
`Na//NH_(3)`
DIBAL-H

Solution :`NaBH_(4)` can not reduces ESTER.
Discussion
19.

Which of the following metal sulphides have maximum solubility in water ?

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`HGS (K_(SP) = 10^(-54))`
`CdS (K_(sp) = 10^(-30))`
`FeS(K_(sp) = 10^(-20))`
`ZnS (K_(sp) = 10^(-22))`

Solution :FeS has maximum solubility in water. Please note that the SOLUBILITIES of different salts in water are directly proportional to their `k_(sp)` value
Discussion
20.

What is the pH of basic buffer ? How it is prepared ?

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SOLUTION :The pH of BASIC BUFFER is `gt` 7.0 it is PREPARED by weak base and its salt with STRONG acid in equal proportion.
e.g. `(NH_4OH + NH_4Cl)` is basic buffer pH: 9.25
Discussion
21.

Which of the following is /are correct?\

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`Al_(2)O_(3)`reacts with CaO but not with `SiO_(2)`
THERMAL stability of carbonates : `BeCO_(3)gtMgCO_(3)gtCaCO_(3)gtSrCO_(3)gtBaCO_(3)`
SOLUBILITY of sulphates: `BeSO_(4)gtMgSO_(4)gtCaSO_(4)gtSrSO_(4)gtBaSO_(4)`
`BeCl_(2)`fors acidic solution in water while `BaCl_(2)` forms neutral solution.

Answer :4
Discussion
22.

Which of the following represents the correct IUPAC name for the compounds concerned ? (a) 2, 2-Dimethylpentane or 2-Dimethylpentane (b) 2, 4, 7-Trimethyloctane or 2, 5, 7-Trimethyloctane (c) 2-Chloro-4-methylpentane or 4-Chloro-2-methylpentane (f) But-3-yn-1-ol or But-4-ol-1-yne.

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SOLUTION :(a) 2, 2-Dimethylpentane. For TWO ALKYL groups on the same carbon its locant is repeated twice, (b) 2, 4, 7-Trimethyloctane since 2, 4, 7-locant SET is lower than 2, 5, 7. (c)2-Chloro-4-methylpentane. Alphabetical order of substituents. (d) But-3-yn-1-ol. Lower locant for the principle functional group i.e., alcohol.
Discussion
23.

When I_(2) is passed through KCl, KF and KBr solution

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`Cl_(2)` and `Br_(2)` are evolved
`Cl_(2)` is evolved
`Cl_(2), Br_(2)` and `F_(2)` are evolved
None of the above

Solution :I is PLACED below F, Cl and Br in the ELECTRONEGATIVITY series. It is not in a position to displace these gases from their respective salt solution
Discussion
24.

Which one of the following is related to thermodynamic equilibrium ?

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All of above
Thermal equilibrium
equilibriums. of pressure
Chemical equilibrium

Answer :B
Discussion
25.

Which one has ions and covalent bond ?

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KCl
KCN
`O_(2)`
`C_(2) H_(6)`

SOLUTION :KCN
Discussion
26.

Why are the pi-bonds weaker and more reactive than the sigma-bonds?

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Solution :The extent of AXIAL overlapping is greater as compared to SIDEWAYS overlappin HENCE `pi`bonds are weaker and more REACTIVE than `SIGMA`-bonds.
Discussion
27.

The state of hybridization of C_(2), C_(3), C_(5) and C_(6) of the hydroccarbon, {:(""CH_(3)""CH_(3)),("|""|"),(underset(7)(C)H_(3)-.^(6)C-underset(5)(C)H=underset(4)(C)H-underset(3)(C)H - underset(2)(C)-=underset(1)(C)H),("|"),(""CH_(3)):} is in the sequence

Answer»

`sp^(3), sp^(2), sp^(2)` and sp
`sp, sp^(2), sp^(2)` and `sp^(3)`
`sp, sp^(2), sp^(3)` and `sp^(2)`
`sp, sp^(3), sp^(2)` and `sp^(3)`

SOLUTION :`{:(""CH_(3)""CH_(3)),("|""|"),(CH_(3)-overset(6)(C)-underset(sp^(2))overset(5)(C)H_(2)=overset(4)(C)H-underset(sp^(3))overset(3)(C)H-underset(sp)overset(2)(C)-=overset(1)(C)H),("|"),(""CH_(3)):}`
THUS, option (d) is correct.
Discussion
28.

Which of the alkaline earth metal hydroxide are amphoteric in nature.

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Solution :BERYLLIUM HYDROXIDE `[Be(OH)_2]` is amphoteric in nature.
Discussion
29.

What is the value of x, y, z from the following reactions ? xS+yHNO_(3)toxSO_(3)+yNO+zH_(2)O

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

ANSWER :A
Discussion
30.

Which of the following is not an example of redox reaction ?

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`CuO+H_2rarr Cu+H_2O`
`Fe_2O_3+3CO RARR 2Fe+3CO_2`
`2K+F_2rarr 2KF`
`BaCl_2 +H_2SO_4rarr BaSO_4 +2HCL`

ANSWER :D
Discussion
31.

What is COD ? Which chemical substance is generally used in its measurement ?

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Solution :COD stands for CHEMICAL Oxygen DEMAND. It is MEASURED by treating the given sample of water with an oxidizing agent, generally `K_2Cr_2O_7`, in presence of dilute `H_2SO_4`
Discussion
32.

Which of the following statements is not correct for an electron that has the quantum numbers n=2 and m=2

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The ELECTRON may have the QUANTUM number`s=+1/2`
The electron may have the quantum number`L=2`
The electron may have the quantum number`l=3`
The electron may have the quantum number`l=0,1,2,3`

SOLUTION :m cannot be GREATER than l (=0,1)
Discussion
33.

Which of the following is not an algae nutrient?

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Hg
`PO_(4)^(3-)`
`NO_(3)^(-)`
`CO_(2)`

SOLUTION :Hg
Discussion
34.

Which of the following ions interfere with chromyl chloride test?

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`NO_(3)^(-)`<BR>`Br^(-)`
`I^(-)`
`NO_(2)^(-)`

ANSWER :A::B::C::D
Discussion
35.

What is correct about x and y?

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Both are ACHIRAL molecules
Both CONTAINS chiral carbon
Both are meso
Both having CENTRE of SYMMETRY in most STABLE configuration

Solution :N//A
Discussion
36.

What is heat capacity ?

Answer»

SOLUTION :HEAT required to increase 1 °C temperature of a substance is called heat CAPACITY.
Discussion
37.

Two 22.4 litre containers A and B contains 8 g of O_2 and 8 g of SO_(2) respectively, at 273 K. and 1 atm pressure, then

Answer»

NUMBER of MOLECULES in Aand B are same
Number of molecules in B is more than that in A.
The RATIO between the number of molecules in A to number of moleucles in B is `2:1`.
Number of molecules in B is three times GREATER than the number of molecules in A.

Answer :A::B::C
Discussion
38.

What is the effect in covalent bond by electron displacement?

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SOLUTION :The PERMANENT POLARITY is PRODUCED in BOND
Discussion
39.

which has the highest pK_(a) value ?

Answer»




ANSWER :A
Discussion
40.

What for the abbreviation SI stands?

Answer»

SOLUTION :INTERNATIONAL SYSTEM of UNITS
Discussion
41.

Which statement is correct regarding green chemistry?

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Avoid USE of catalyst.
Use HARMFUL chemicals
FORMATION of wastes or BYPRODUCTS should be prevented.
All of the above

Solution :Formation of wastes or byproducts should be prevented.
Discussion
42.

What are vicinal dihalides? Give an example.

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Solution :Vicinal dihalides, compounds that have halogens on ADJACENT CARBONS, are PREPARED by the reaction between a HALOGEN and an ALKENE. The simplest example is the reaction between ethylene and chlorine to give 1,2-dichloroethane (ethylene dichloride).
Discussion
43.

Which of the following is ionic ?

Answer»

`PbF_(4)`
`SnCl_(4)`
`CF_(4)`
`SiF_(4)`

ANSWER :A
Discussion
44.

Which of the following statements are true regarding photochemical smog It is oxidsing in nature It is formed when intensity of solar radiation is very high lt is formed by PRN, Ozone and oxides of nitrogen It is formed by the particulate carbon and SO_(2) It is reducing in nature

Answer»

A, B, and D
A, D and E
A,C and D
A, B and C

Answer :D
Discussion
45.

Which one of the following is called halogen family?

Answer»

GROUP 17
Group 16
Group 1
Group 2

Answer :A
Discussion
46.

What happens to oxidation number of an element during reduction?

Answer»


ANSWER :OXIDATION NUMBER DECREASES.
Discussion
47.

What type of compounds are usually formed by boron?

Answer»

SOLUTION :ELECTRON DEFICIENT
Discussion
48.

X' compound (C_(4)H_(8)O) decolorises bromine water react with I_(2) & NaOH it give yellow ppt identify 'X'

Answer»

`CH_(3)-overset(O)overset(||)(C)-CH_(2)-CH_(3)`
`CH_(3)-UNDERSET(OH)underset(|)(CH)-CH=CH_(2)`
`CH_(3)-overset(CH_(3))overset(|)underset(OH)underset(|)(C)-CH_(3)`
`CH_(3) -HC=CH-underset(OH)underset(|)(CH_(2))`

SOLUTION :`CH_(3)-underset(OH)underset(|)(CH)-CH=CH_(2)` gives bromine water TEST. LUCAS reagent test and haloform test.
Discussion
49.

Which of the following statements is wrong about athode rays?

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They travel in straight LINES towards cathode.
They produce HEATING effect.
They carry negative charge.
They produce X-rays when strike with MATERIAL having HIGH atomic masses.

Answer :A
Discussion
50.

Which of the statements is not true?

Answer»

`K_(2)Cr_(2)O_(7)` solution in acidic MEDIUM is orange
`K_(2)Cr_(2)O_(7)` solution BECOMES yellow on increasing the PH BEYOND 7
On passing `H_(2)S` through acidified `K_(2)Cr_(2)O_(7)` solution, a milky color is observed
`Na_(2)Cr_(2)O` is perferred over `K_(2)Cr_(2)O_(7)` in VOLUMETRIC analysis In the replacement reaction 

Answer :D
Discussion