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.

When ethyl bromide is added to potassium t-butoxide, the product is ethyl t-butyl ether. underset("ethyl bromide")(CH_3CH_2-Br)+underset("ptassium t-butoxide")((CH_3)_3C -OK)tounderset("ethyl t-butyl")((CH_3)_3C-O)-underset("ether")(CH_2CH_3) Which of the following statements is/are correct ?

Answer»

when the concentration of ETHYL bromide is DOUBLED rate is also doubled.
when the concentration of potassium t-butoxide is TRIPLED and the concentration of ethyl bromide is doubled rate will increases six times.
Elimination product dominates when TEMPERATURE is raised.
when the concentration of potassium t-butoxide is tripled and the concentration of ethyl bromide is doubled rate will increase three times.

Answer :A::B::C
Discussion
2.

Which one is the more acidic in aqueous solution ?

Answer»

`NiCl_2`
` FeCl_2`
`AlCl_3`
`BeCl_2`

SOLUTION :CATION with more change undergoes more EXTENT of HYDROLYSIS
Discussion
3.

Which are only Lewis acid but not Bronsted acid of CO_2, BCl_3, NH_3, CH_3NH_2, NO_2^+ and C_6H_5NH_3^+ ?

Answer»

SOLUTION :`CO_2 , BCl_3 , NO_2^+`
Discussion
4.

What are the four prominent lines in Balmer series of hydrogen spectrum?

Answer»


Answer :`H_(alpha),H_(BETA),H_(GAMMA)` and `H_(DELTA)`
Discussion
5.

Whichorbitalsare equinian orbitalsfrom the given ?

Answer»

SOLUTION :(i) `3d_(XY), 3d_(Z),3d_(xz)`areequivalent .
(ii) `4d_(xy) ,4d_(yz),4d_(z^(2))` areequivalent
Discussion
6.

Which statement is correct for H_3PO_3 & H_3PO_4 ?

Answer»

`H_3PO_3` is a MONO basic and reducing AGENT.
`H_3PO_3` is a dibasic & reducing agent.
`H_3PO_4`is a tribasic and reducing agent.
`H_3PO_4` is a tribasic and OXIDISING agent.

Answer :B
Discussion
7.

Which oxide is acidic ?

Answer»

`K_2O`
`B_2O_3`
`Na_2O`
`Al_2O_3`

ANSWER :B
Discussion
8.

Write the common names of the following halides (a) CH_(3)-CH-CH_(2)Br b) CH_(3)CH_(2)CHCl_(2) c) CH_(2)-overset(I)overset(|)underset(I)underset(|)C-CH_(3) (d) CHBr_(3) e) C Cl_(4)

Answer»

Solution :a. Isobutyl bromide b. Propylidene chloride
C. Propylidene IODIDE d. Bromoform
E. CARBON tetra chloride.
Discussion
9.

Which one of the following is incorrect statement ?

Answer»

for a system at equilibrium, Q is always less than the equilibrium constant.
equilibrium can be attained from EITHER SIDE of the recation.
presence of catelyst affect both the forward reaction and REVERSE reaction to the same EXTANT.
equilibrium constant varied with TEMPERATURE.

Answer :A
Discussion
10.

What type of atomic orbitals can oversap to form molecular orbitals ?

Answer»

Solution :Atomic ORBITALS with COMPARABLE ENERGIES and proper orientaiton.
Discussion
11.

Which element do you think would have been named by Lawrence Berkeley laboratory.

Answer»

SOLUTION :LW (LAWRENCIUM). BK (BERKELIUM)
Discussion
12.

What are the conditions under which real gases approach ideal behaviour?

Answer»

SOLUTION :Only at HIGH TEMPERATURE and LOW PRESSURE.
Discussion
13.

Who modified Bohr's theory by introducing elliptical orbits for electrons path?

Answer»

RUTHERFORD
Thomson
Hund
Sommerfeld

Answer :D
Discussion
14.

The sub-shells filled one by one for 4th period elements are

Answer»

3D, 4S and 4P
45, 4p and 4d
4s, 3d and 4p
3d, 4p and 4s

Answer :C
Discussion
15.

The structure of the compound that gives a trobromo derivative on treatment with bromine water is

Answer»




ANSWER :A
Discussion
16.

What is a functional group ? Write the functional groups of the following : (i) Thioalcohol (ii) Isothiocyanate (iii) Thiocyanate and (iv) Sulphonic acid (v) Sulphones (vi) Sulphoxides.

Answer»


SOLUTION :
Discussion
17.

What is haemolysis? Why intravenous fluid are isotonic to blood ?

Answer»

Solution :(i) The osmotic pressure of the blood cells is approximately equal to 7 atm at `37^(@)C.`
(ii) The intarvenous injcctions should have same osmotic pressure as that of the blood (ISOTONIC with blood).
(iii) If the intervenous SOLUTIONS are too dilute that is hypotonic, the solvent from OUTSIDE of the cells FLOW into the cell to normalise the osmotic pressure and this process is called haemolysis causes the cells to burst.
(iv) On the other. hand, if the solution is too concentrated, that is hypertonic, the solvent molecules will flow out of the cells, which causes the cells to shrink and DIE.
(v) For this reason, the intervenous fluids are prepared such that they ar istonic to blood (`0,9%` mass/volume sodium chloride solution).
Discussion
18.

What is oxidation number of .C. in C_(3)O_(2) ?

Answer»

SOLUTION :The OXIDATION NUMBER of .C. in `C_(3)O_(2)" is "+4/3`.
Discussion
19.

Which of the following is incorrect about SI units ?

Answer»

Density in `KGM^(-3)`
FORCE in Newtons
Pressure in Pascals
Amount of the susbtance in mol `L^(-1)`

Answer :D
Discussion
20.

The uncertainity principle and the concept of wave nature of matter were proposed by----- and ---- respectively

Answer»

PAULI, Hund
Heisenberg, Aufbau
Heisenberg, DE Broglie
Heisenberg, Planck

Answer :B
Discussion
21.

Which one of the following will have greatest average speed of its molecules ?

Answer»

0.5 mol of `O_(2)` at 500 K
0.2 mol of `CO_(2)` at 400 K
1.0 mol of He at 200 K
0.4 mol of `NH_(3)` at 300 K

Solution :AVERAGE speed `=sqrt((8RT)/(piM))`. Thus, GREATER the value of `sqrt((T)/(M))`, greater is the average speed. These VALUES are :
`O_(2)=sqrt((500)/(2))=3.95,CO_(2)=sqrt((400)/(44))=3.0`
`He=sqrt((200)/(4))=7.0, NH_(3)=sqrt((300)/(17))=4.2`
Thus, He at 200 K will have highest average speed.
Discussion
22.

What happened when more solution of CdCl_2 is added in saturated solution of CdS and starred?

Answer»

No EFFECT.
Increase the PPTS of CdS.
Dissolution of precipitate of CdS in solution.
Formation of precipitate of `CdCl_2` .

Answer :C
Discussion
23.

What is molar volume of gas ? What is its value.

Answer»

Solution : ..Volume of 1 mole IDEAL gas at STP is known as molar volume of ideal gas...
At STP (273.15 K temperature and 1 BAR PRESSURE) the volume of 1 mole ideal gas is 22.710981 L `mol^(-1)` it is molar volume.
Discussion
24.

Which one of the following is a standard solution ?

Answer»

It contains one GRAM EQUIVALENT mass of the substance in one LITRE solution
Its STRENGTH is accurately known
Its strength is to be determined
A solution which has been prepared from pure substance

Solution :N//A
Discussion
25.

Which of the following statements is correct

Answer»

oxidation number of Fe in `[Fe(H_(2)O)_(5)NO]SO_(4)` is +1
oxidation number of SODIUM in sodium amalgam is -1
oxidation state of carbon in HCN is + 4
All STATEMENT are correct

Solution :Since the charge on `SO_(4^(2-)` is -2 therefore the TOTAL charge ONTHE complex ION `[Fe(H_(2)O)_(5)NO]` is +2 since NO is a paramagnetic molecule its unpaired electron is transferred to iron As a resultNO carries +1 charge further since `H_(2)O` is a neutral molecule sum of its O.N is zero putting the values of all the oxidation number the O.N of Fe in the complex ion `=x+0xx5+1=+2`
`therefore =+1`
Thus the O.N of Fe is +1 and the correct structure of `[Fe(H_(2)O)_(5)overset(+)NO]SO_(4)^(2-)`
Discussion
26.

Which of the following is not lyophilic

Answer»

Gelatin sol
Silver sol
Sulphur sol
`As_(2)S_(3)` sol

Solution :(bcd) (B) silver sol, (c) sulphur POWDER in WATER and (d) `As_(2)S_(3)` sol are lyophobic whereas (a) gelatin sol in water is lyophilic whereas (a) Gelatin sol in wate4r is lyophilic
(a) is not CORRECT
Discussion
27.

What is the steps involve in the calculation of molecular formula from empirical formula ?

Answer»

SOLUTION :MOLECULAR mass and empirical formula are used to deduce molecular formula of the compound .
Steps to calculate molecular formula:
1. Empirical formula is found out from the percentage composition of elements
2. Empirical formula mass can be found from the empirical formula
3. Molecular mass is found out from the GIVEN data
4. Molecular formula = `("Empirical formula")_(N)`
5. where, n = `("Molecular mass")/("Empirical formula mass")`
Discussion
28.

Which of the following compounds will show cis-trans isomerism?

Answer»

`(CH_(3))_(2)C=CHC_(2)H_(5)`
`H_(2)C=C Cl_(2)`
`CH_(3)HC=C ClCH_(3)`
`HClC=CH_(2)`

Solution :
Discussion
29.

Two moles of ammonia occupy a volume of 5 L at 27^@C and 9.32 atm pressure. Calculate the compressibility factor of the gas.

Answer»

Solution :In the PRESENT case,
`P= 9.32" atm, " "" V=5L, ""T = 27 + 273 = 300 K`
`n = 2, " and " "" R=0.0821 L " atm " K^(-1) mol^(-1)`
The COMPRESSIBILITY factor Z is given by
`Z=(PV)/(nRT)`
`:. "" Z= (9.32xx5)/(2xx0.0821xx300) =0.946`
Hence, the compressibility factor for NH3 under the given conditions is 0.946.
Discussion
30.

The sizesof followingspeciesincrease in theorder :

Answer»

`MG^(2+) LT Na^(+)lt F^(-)lt A1`
`F^(-) lt A1 lt Na^(+) lt Mg^(2+)`
`A1 lt Mg ^(2+)lt F^(-)lg Na^(+)`
`Na^(+) , lt A1 lt F^(-)lt Mg^(2+)`

SOLUTION :`Mg^(2+) , Na^(+) ` and `F^(-)` are isoelectronicions(havingtwo filledshells )thereforetheir size increae inthe order `:Mg^(2+), lt Na^(+)lt Na^(2+)lt F^(-)` Allbelongsto the 3rdperiodand alsodoes not carryany chargeThereforeit has the largestsize . Thustheoverallsizesincreasesin the order `: Mg^(2+)lt Na^(2+) lt F^(-)lt A1`
Discussion
31.

Which of the following set of raw materials are used in the manufacture of Na_(2)CO_(3) by Solvay process?

Answer»

`Ca(OH)_(2), NH_(3).CO_(2)`
`CaCl_(2), NH_(3), CO_(2)`
`NaOH, NH_(3), CO_(2)`
`NACL, NH_(3), CO_(2)`

ANSWER :D
Discussion
32.

What is obnormal molar mass?

Answer»

Solution :The dissociation or ASSOCIATION of SOLUTE molecules would ALTER the total number of particles present in the solution and hence affect the RESULTS of measured colligative PROPERTIES.In such solution determined using colligative properties would be different from the actual molar mass and it is called abnormal molar mass
Discussion
33.

What is meant by 'autoprotolysis' of water? What is its significance?

Answer»

Solution :SELF IONISATION of water is CALLED autoprotolysis of water`H_2O+iffH_3O^+ +OH-`This makes water CAPABLE of reacting with both acids and bases(AMPHOTERIC).
Discussion
34.

The systematic name of (CH_(3))_(2)CH- COOH

Answer»

2-Propanoic acid
Isobutanoic acid
2- Methylpropanoic acid
2-Methylbutanoic acid

Answer :C
Discussion
35.

What are electrophiles and nucleophiles ? Explain with examples

Answer»

Solution :
When the BONDING interaction take place between ELECTROPHILIC REAGENT and nucleophilic reagent, then electrophilic reagent accept ELECTRON pair
Discussion
36.

What is present in troposphere ?

Answer»

SOLUTION :TROPOSPHERE contains substances like dioxygen, dinitrogen, CARBON dioxide, water vapour, ETC.
Discussion
37.

Write equilibrium constant (equilibrium law) for the following reaction. (i)4NH_(3(g)) + 5O_(2(g)) hArr 4NO_((g)) + 6H_2O_((g)) (ii)H_(2(g)) + I_(2(g)) hArr 2HI_((g)) (iii)N_(2(g)) + 3H_(2(g)) hArr 2NH_(3(g))

Answer»

Solution :(i)`K_c=([NO]^4 [H_2O]^6)/([NH_3]^4 [O_2]^5)`…..(EQ.-i)
(ii)`K_c="[HI]"^2/([H_2][I_2])`…(Eq. -ii)
(iii) `K_c=([NH_3]^2)/([N_2][H_2]^3)`….(Eq. -iii)
Discussion
38.

What will be the mass of oxygen liberated by decomposition of 200 mL hydrogen peroxide solution with a strength of 34 g per litre ?

Answer»

`25.5 g`
`3.0 g`
`3.2 g`
`4.2 g`

Solution :STRENGTH of the solution = 34 g/L
1 L of the solution contains 34 g of `H_(2)O_(2)`
200 mL of the solution contains `(34)/(1000)xx200=6.8 g` of `H_(2)O_(2)`
`underset(2xx34 g)(2H_(2)O_(2))to 2H_(2)O+underset(32 g)(O_(2))`
68 g of `H_(2)O_(2)` GIVES 32 g of `O_(2)`
6.8 g of `H_(2)O_(2)` gives `= (32)/(68)xx6.8=3.2g` of `O_(2)`
Discussion
39.

Zeolites are used as 1) ion exchangers 2) molecular sieves 3) water softener The correct uses are

Answer»

1,2 only
2,3 only
1,3 only
1,2,3

Solution :ZEOLITES are used as ION echangers, MOLECULAR SIEVES, water softner
Discussion
40.

Which of the following elements does not show allotropy ?

Answer»

NITROGEN
Bismuth
Antimony
Arsenic

Answer :A
Discussion
41.

Which of the following has pentagonal bipyramidal shape?

Answer»

`PCl_(5)`
`SO_(4)^(2-)`
`CO_(3)^(2-)`
`IF_(7)`

ANSWER :D
Discussion
42.

What is adsorption chromatography? Write its type

Answer»

Solution :This method is based upon the differential adsorption of the various components of a mixture on a suitable adsorbent. Since same compounds are more STRONGLY desorbed than the other, they will travel though the column at different rates and thus get separated. Following are two main types of chromatographic technique based on the principle of different adsorption.
(i) Column chromatography and
(II) THIN LAYER chromatography
Discussion
43.

Which of the following has least bond energy?

Answer»

`F_2`
`H_2 `
`N_2`
`O_2`

ANSWER :A
Discussion
44.

Which of the following statement is not true about amorphous solids ?

Answer»

On heating they MAY BECOME crystalline at certain temperature
They may become crystalline on KEEPING for long time
AMORPHOUS solids can be moulded by heating
They are ANISOTROPIC in nature

Answer :d
Discussion
45.

Which of the following thermodynamic relation is correct ?

Answer»

`dG =V d p -SdT`
`DE = P DV + T dS`
`dH = - V dP +T d S`
`Dg= vDp+ S dT`

Solution :`G= H - TS ` But `H =U + PV`
`:. G= U + PV - TS`
Differentiating it completely ,we GET
`dG=dU +PdV+ VdP - TdS - SdT`…(i)
But `dU =DQ+dw` and `w= -PdV`
`:. dU = d-PdV` or `dq = dU+ PdV`…(ii)
Further, for averversible process, `dS= ( dq)/(T)`
or `dq=TdS`....(iii)
From (ii)and (iii), `dU +PdV=T DeltaS`
Substituting this in (i),weget`dG =VdP - SdT`
Discussion
46.

Which of the following statements is false?

Answer»

Work is a STATE function
Temperature is a state function
Change of state is completely defined when initial and final STATES are specified
Work appears at the boundary of the system

Solution :Work, HEAT, heat capacity are PATH functions. All the REMAINING parameters are state functions
Discussion
47.

What [NH_4^(+) ] in a solution that contains 0.02M NH_3(K_b =1.8 xx 10^(-5) ) and 0.01 M KOH ?

Answer»

`9 xx 10^(-6)`
` 1. 8 xx 10^(-5)`
` 3.6 xx 10^(-5)`
NONE of these

Solution :`K_b =([NH_4^(+) ][OH^(-)])/( [NH_4OH]), 1.8 xx 10 ^(-5)=([NH_4^(+)][10^(-2)])/( 2XX10 ^(-2))`
` [NH_4^(+)] =3.6 xx 10 ^(_5) `
Discussion
48.

Tile 4f-subshell is successively filled for

Answer»

RARE earths
Rare GASES
TRANSITION METALS
Transition metals

ANSWER :A
Discussion
49.

Which of the following is not a thermodynamic function?

Answer»

INTERNAL energy
enthalpy
entropy
frictional energy

Answer :D
Discussion
50.

Which of the following compounds can exhibit geometrical isomerism?

Answer»

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

`CH_(2)=CH-CH_(2)-BAR(N)H_(2)`
`CH_(3)-O-CH_(2)-CH_(3)`

SOLUTION :DUE to lack of conjugation
Discussion