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.

Which of the following ions are not isoelectronic with Ar?

Answer»

`NA^(+)`
`CA^(2+)`
`Cl^(-)`
`K^(+)`

Answer :a
Discussion
2.

Titration curves for 0.1M solution of three weak acids HA_1,HA_2 and HA_3 with ionization constants K_1, K_2 and K_3 respectivelyare plotted as shown in the figure. Which of the following is/are true?(##AKS_ELT_AO_CHE_XI_V01_B_C05_E02_135_Q01.png" width="80%">

Answer»

`K_2 =(K_1+K_3) //2`
` K_1 lt K_3`
` K_1 gt K_2`
` K_2 gt K_3`

SOLUTION :` 2 lt 4 lt 5 rArr K_1 gt K_2 gt K_3`
ACID strength ` ALPHA (1)/( pH)`
Discussion
3.

What are abnormal colligative properties?

Answer»

Solution :The experimental values of COLLIGATIVE properties in most of the cases RESEMBLE closely to those OBTAINED theortically by their formula. However in some cases experimental values of colligative properties differ widely form those obtained theortically. Such experimental values are REFFERED to as abnormal colligative properties.
Discussion
4.

Which one is polyprotic acid :

Answer»

`CH_(3)COOH`
`C_(6)H_(5)COOH`
`C_(6)H_(4) (OH) COOH`
Malonic ACID

Solution :Malonic acid `[CH_(2) (COOH)_(2)]` is a dibasic acid
Discussion
5.

Which one among the following is the standard for atomic mass?

Answer»

`""_(1)H^(1)`
`""_(6)C_(12)`
`""_(6)C_(14)`
`""_(8)O^(16)`

Solution :Standard ELEMENT used to determine atomic mass is `""_(6)C^(12)`
Discussion
6.

Which of the following compounds contain after the carbon atoms in the same hybridisation state?

Answer»

`H-C -= C -C -= C-H`
`CH_(3) -C -= C- CH_(3)`
`CH_(2)= C = CH_(2)`
`CH_(2)= CH- CH= CH_(2)`

Solution :
`because` EVERY CARBON have one DOUBLE bond
Discussion
7.

Which of the following compound has maximum volatility-

Answer»




SOLUTION :In o-hydroxy carboxylic ACID, the -OH and -COOH groups are situated at two adjacent carbon atoms of the ring and involved in intramolecular H-bond formation. So, these molecules EXIST as DISCRETE molecules and cosequently, the compound has maximum volatility.
Discussion
8.

What is the composition of the compound formed by the reaction of carbon with fluorine ?

Answer»

SOLUTION :`(CF)_n`
Discussion
9.

Which of the following is the most stable cycloalkane?

Answer»




ANSWER :A
Discussion
10.

Which of the following is the strongest oxidising agent ?

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`l_(2)`

ANSWER :A
Discussion
11.

Which is the shape of carbocation?

Answer»

Planar
Tetrahedra
Linear
Cone shape

Answer :A
Discussion
12.

Which of the following orbital(s) lie in the xy-plane?

Answer»

`d_(x^(2)-y^(2))`
`d_(xy)`
`d_(XZ)`
`d_(yz)`

ANSWER :A::B
Discussion
13.

Which are important ingredients present in Portland cement ?

Answer»

Solution :Important ingredients present in Portland cement are dicalcium silicate `(Ca_(2)SiO_(4))` 26%, tricalciumsilicate`(Ca_(3)SiO_(5)) 51%` and tricalciumaluminate `(Ca_(3)Al_(2)O_(6))`11%.
Discussion
14.

Which of the following compounds exhibits stereo isomerism

Answer»

2-methyl butene-1
3-methyl butyne-1
3-methyl butanoic acid
2-methyl butanoic acid

Solution :
2-methyl butanoic acid has ONE CHIRAL CENTRE. So it exhibits STEREO isomerism
Discussion
15.

Which one of the following combinations will give the highest stability to a nucleus with atomic number Z and mass number N

Answer»

Even Z and odd N
Odd Z and even N
EvenZ and even N
Odd Z and odd N

Solution :n/p ratio is 1 in all the light stable nuclei upto CALCIUM and there after the ratio isgreater than 1 and increases up to 1.6. Nuclei that fall above the stability zone have an EXCESS of neutrons while those lying below have more PROTONS. Both of these CAUSE INSTABILITY. Even Z and even N give high stability to nucleus.
Discussion
16.

What are hybridisation states of each carbon atom in the following compounds? CH_(2)=C=O, CH_(3)CH=CH_(2), (CH_(3))_(2)CO, CH_(2)=CHCN, C_(6)H_(6)

Answer»

Solution :`overset(SP^(2))CH_(2)=overset(sp)C=O` `overset(sp^(3))CH_(3)-overset(sp^(2))CH=overset(sp^(2))CH_(2)` `overset(sp^(3))CH_(3)-underset(sp^(2))overset(O)overset(||)C-overset(sp^(3))CH_(3)`
`overset(sp^(2))CH_(2)=overset(sp^(2))CH-overset(sp)C=N`
Discussion
17.

When H_(2)O_(2) is added to ice cold solution of acidified potassium dichromatic in ether and the contents are shaken and allowed to stand.

Answer»

a blue COLOUR is obtained in ether due to formation of `Cr_(2)(SO_(4))_(3)`
a blue colour is obtained in ether due to formation of `CrO_(5)`
a blue colour is obtained in ether due to formation of `CrO_(3)`
chromyl chloride is formed

Solution :`Cr_(2)O_(7)^(2-)+2H^(+)4H_(2)O_(2)rarr2CrO_(5)+5H_(2)O`
Discussion
18.

What happends when : (a) Aqueous solution of lead acetate and sodium sulphide are mixed with each, (b) A few drops of sodium nitroprusside are added to the aqueous solution containing sodium suphide. (c) An aqueous solution containing sodium iodide is treated with a few drops of CS_(2) followed by excess of chlorine water. (d) Phoshorus is fused with sodium peroxide

Answer»

Solution :(a) A black precipitate of lead sulphide is formed.
`Na_(2)S + underset("Lead acetate")((CH_(3)COO)_(2) Pb rarr underset(("Black ppt")) (PbS )+ underset("Sod. Acetate")(2CH_(3)COONA)`
(B) The solution acquires a violet colour.
`Na_(2)S + underset("Sod. nitroprusside")(Na_(2) [Fe(CN)_(5)NO]) rarr underset(("violet colour"))(Na_(4) [Fe(CN)_(5) NOS])`
(c) The oily layer of `CS_(2)` acquires a violet colour. chlorine being more reactive than iodine displaces the same from the salt solution
`2NaI + Cl_(2) rarr 2NaCl + I_(2)`
(d) Sodium phosphate is formed on fusion.
`5Na_(2) O_(2) + 2P overset(("Fuse"))rarr underset("Sod. phosphate")(2Na_(3)PO_(4) +2Na_(2)O)`
Discussion
19.

Which one of the following is a gas

Answer»

`BF_(3)`
`BCl_(3)`
`BBr_(3)`
All of these

Solution :Lesser VANDER Waal.s FORCES
Discussion
20.

What is the ionic product Q_(sp) ? Explain by example.

Answer»

Solution :When the solution of two sparingly SOLUBLE salt mix together than the product of IONS of sparingly soluble salt is called solubillish product.
If `AgNO_3` and NaCl mix together
`Q_(sp)=[AG^+][CL^-]`
`[Ag^+]=AgNO_3`
`[Cl^-]=NaCl`
Discussion
21.

Which of the following orbitals are degenerate ? 3d_(xy), 4d_(xy), 3d_(z^(2)), 3d_(yz) , 4d_(yz) ,4d_(z^(2))

Answer»

Solution :`3d_(xy) , 3d_(Z2), 3d_(YZ)` and `4d_(xy) , 4d_(yz) , 4d_(z2)`
Discussion
22.

Use Markovnikov's rule to predict the product of the following reactions : (i)HCl with CH_3 C Cl=CH_2and (ii)HCl with CH_3CH=C (CH_3)_2

Answer»

SOLUTION :(i)`CH_3 C CL=CH_2+HCL to CH_3C Cl_2CH_3` (ii) `CH_3CH=C (CH_3)_2 + HCl to CH_3CH_2 -C Cl(CH_3)_2`
Discussion
23.

Which of the following will produce aromatic compound as product ?

Answer»

`CH_3 - C -= C underset(Delta)OVERSET("Red HOT FE TUBE")to`
`nC_6H_(14)underset(Cr_2O_3 // 600^(@)C)overset(Al_2O_3)to` ..........

SOLUTION :
Discussion
24.

WhichiondoesnotposseselectroncofigurationlikeNe?

Answer»

`Na^(+)`
`F^(-)`
`Mg^(2+)`
`CI^(-1)`

SOLUTION :`Na^(+)to (11 =-1) = 10` electrons
`F^(-)to (9+1) = 10 `electrons
`Mg^(2+)to (12- 2) = 10`electron
`CI^(-) to (17+ 1)= 18`electrons
Discussion
25.

What is the hybrid state of carbon in ethyne, graphite and diamond ?

Answer»

SOLUTION :`sp^2 , sp^3`
Discussion
26.

Which of the following statement 1s wrong about electrons ?

Answer»

it is a particle
It has wave nature
it EMITS energy while revolving in an orbit
Its MOTION is effected by magnetic FIELD

Answer :C
Discussion
27.

What volume of 3 molar HNO_3is needed to oxidize 8g of Fe^(2+)"to " Fe^(+3) ? HNO_3 , gets converted to NO

Answer»

8 ML
16 mL
32 mL
64 mL

SOLUTION :eq. `HNO_3 =Fe^(2+)`
`V_1N_1= V_1N_1`
`V_1M_1n_1 = W/Exx1000`
`V xx 3 xx 3 = (8)/((56)/1) xx1000`
`V=(Fxx1000)/(56xx9)=15.8`ml ( `~~16` ml)
= 15.8 ml
Discussion
28.

What is the molecular mass of water?

Answer»

Solution :Molecular MASS =Real mass of one molecular `6.022 XX 10^(23)` water molecules=18g
One water molecular =?
Mass of a molecule `=(18)/(6.022 xx10^(23))=2.99 xx 10^(-23)g`
`=2.99 xx 10^(-26)kg`
Discussion
29.

Which laws give information about Dalton's atomic theory ? According to Dalton's atomic theory which other laws give information about atomic principle.

Answer»




SOLUTION :LAW of conservation of mass.
Law of definite PREPARATION.
Law of MULTIPLE proportion and
Avogradro law give explanation of Dalton.s atomic THEORY.
Discussion
30.

Which isotope of hydrogen emitted beta-particle ?

Answer»

Solution :The TRITIUM isotope of HYDROGEN emitted the `BETA` -particles.
Discussion
31.

Which of the following molecule contain no pi bond?

Answer»

`SO_(2)`
`NO_(2)`
`CO_(2)`
`H_(2)O`

SOLUTION :
Water `(H_(2)O)` contains only `sigma` bonds and no `PI` bonds.
Discussion
32.

Three solutions eaach of 100 mL containing 0.4 M As_(2)S_(3),5M NaOH and 6MH_(2)O_(2), respectively were mixed to form AsO_(4)^(3-) and SO_(4)^(2-) as products. Q. When the above solution is allowed to stand for some time what volume of O_(2) will be obtained STP?

Answer»

0.112 L
0.224 L
0.224L
0.448L

SOLUTION :If a `H_(2)O_(2)` solution is allowed to stand, it decomposes to `O_(2)` and `H_(2)O`
`underset(40)(H_(2)O_(2)tounderset(0)(H_(2)O)+(1)/(2)underset(0)(O_(2))`
`{:(mmol es),(of H_(2)O_(2)),(l eft)]:}-(1)/(2)xx40=20m" mol of "O_(2)`
THUS, mmol es of O_(2)formed`=40xx(1)/(2)=20`
Volume of `O_(2)` at `STP=20xx10^(-3)xx22.4L`
`(because1 " mol of "O_(2) at STP=22.4L)`
`=0.448L`
Discussion
33.

The value of the gas constant R is

Answer»

`0.082dm^(2)ATM`
`0.987"cal mol"^(-1)K^(-1)`
`8.3Jmol^(-1)K^(-1)`
`8"ERG mol"^(-1)K^(-1)`

Answer :C
Discussion
34.

Three solutions eaach of 100 mL containing 0.4 M As_(2)S_(3),5M NaOH and 6MH_(2)O_(2), respectively were mixed to form AsO_(4)^(3-) and SO_(4)^(2-) as products. Q. Percentage strength of the H_(2)O_(2) solution left after reaction is

Answer»

`0.017%`
`0.113%`
`0.51%`
`0.68%`

SOLUTION :`M of H_(2)O_(2)` left`=(2M)/(15)`
`N of H_(2)O_(2)` left`=(2XX2)/(15)=(4)/(15)N`
`1N of H_(2)O_(2)=(1eq)/(L)H_(2)O_(2)=5.6V`
(Volume STRENGTH)`=1.7%`
`(4)/(15)NH_(2)O_(2)=1.7xx(4)/(15)=0.452%`
Discussion
35.

Which compound would give 5-keto-2-methylhexanal on ozonolysis ?

Answer»




SOLUTION :
Discussion
36.

Which of the following can form cis-transisomers

Answer»

`C_(2)H_(5)Br`
`(CH)_(2)(COOH)_(2)`
`CH_(3)CHO`
`(CH_(3))_(2)COOH_(2)`

Solution :TRANS isomer is symmetric so it has HIGH M.P
Discussion
37.

Which of the following statements is true about Ca(OH)_(2) ?

Answer»

It is used in the preparation of BLEACHING powder
It is a LIGHT blue solid .
It does not possess disinfectant PROPERTY.
It is used in the MANUFACTURE of cement .

ANSWER :A
Discussion
38.

What is the value of bond angle inPCl_(5) ?

Answer»

<P>

SOLUTION :There are three P - CL are in one plane. Its angle
Cl - P - Cl is `120^(@)`. Two P - Cl is at `90^(@)` .
Discussion
39.

What is used for drying alcohol and non-acidic gases and why?

Answer»

SOLUTION :CALCIUM is used for drying ALCOHOL and non-acidic gases bacause Ca does not REACT with alcohol.
Discussion
40.

Write the structural isomers of an alkene having M.F. C_4H_8. How can you distinguish between them ?

Answer»

SOLUTION :`C_4H_8` has three structural isomers :

These can be easily distinguished on the BASIS of their REDUCTIVE OZONOLYSIS products because each of them gives different products :
Discussion
41.

Which of the following equation is known as Van der Waal.s equation ?

Answer»

`(PV)/(K)=NRT`
`(P+(an^(2))/(V))(v+nb)=nRT`
`(P-(an^(2))/(v))(v-nb)=nRT`
`(P+(an^(2))/(v^(2)))(v-nb)=nRT`

Answer :D
Discussion
42.

What is Ritz combination principle ?

Answer»

SOLUTION :`BAR(v)= R ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))` where R is called RYDBERG constant
Discussion
43.

Which of thefollowingordersaboutionizationenergyis correct?

Answer»

`N gt O gt F `
`N LT O lt F`
`N gt O lt F`
`N lt O gt F`

Solution :Ingeneral as thenuclearchargeincreasesfromleft to rightin periodtheionizationenthalpyincreasesaccordingly.ButionizationenthalpyofN is highestthan thatof O due to greaterstabilityof theexactly half- filledelectronicconfigurationof the2p-orbitals`(1s^(2)2s^(2)2p_(x)^(1)2p_(y)^(1) )` INN atom. Thereforeamongst N, O andatoms, the ionizationenthalpyof O is thelowesti.e.,option( c) iscorrect.
Discussion
44.

Which one of the following is more basic?

Answer»

`Ca(OH)_(2)`
`MG(OH)_(2)`
`NaOH`
`Al(OH)_(3)`

Answer :C
Discussion
45.

What are X and Y in the following reactions ?

Answer»

SOLUTION :After the REARRANGEMENT the FOLLOWING PRODUCTS are FORMED.
Discussion
46.

What is bond stabilising energy ?

Answer»


ANSWER :A
Discussion
47.

What is the relationship between pK_(ln) and pH at the equivalence point ?

Answer»

SOLUTION :`pK_(LN) ` = pH at the EQUIVALENCE point.
Discussion
48.

Which of the following come under the view of thermodynamics?

Answer»

Predicting the feasibility of chemical CHANGE
Predicting the extent of completion of the chemical change
RATE at which chemical change OCCURS at particular set of conditions
Effect of temperature on the rate of reaction

Answer :A
Discussion
49.

Which of the following will have a meso-isomer also ?

Answer»

2-Chlorobutane
2,3-Dichlorobutane
2,3-Dichloropentane
2-Hydroxypropanoic acid

Solution :
2, 3-dichlorobutane have MESO ISOMER due to the presence of plane of SYMMETRY.
Discussion
50.

Which of the following compound is (meso) compounds?

Answer»




All

SOLUTION :
Discussion