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.

How many of the followign are correct orders for Basic Strength :

Answer»


ANSWER :`4(S_(1),S_(2),S_(4),S_(5))`
Discussion
2.

How many of the carboxylic acid reduce tollen's reagent ? CH_(3)COOH, HCOOH, C_(6)H_(5)COOH, CH_(3)CH_(2)CH_(2)COOH, (CH_(3))_(2) CHCOOH phthalic acid, isophthalic acid, m- toluic acid, salicylic acid

Answer»


ANSWER :1
Discussion
3.

How many of given statements are true for lanthanums? 1. The common oxidation state of all lanthanides is +3. 2. All lantanides belongs to group III of modern periodic table. 3. All lanthanides belongs to seventh period of periodic table 4. The radius for all lanthanides cations (M^(+3)) decrease from Ce^(+3) to Lu^(+3). 5. The basic character of hydroxide increases on moving from Ce(OH)_(3) to Lu(OH)_(3) 6. All lanthanides are metals. 7. The reducing power of lanthanides decreases from Ce to Lu. 8. Lanthanides reacts with cold water to liberate H_(2).

Answer»


Solution :1. All lanthanides exhibits +3 O.N. but few also exhibit +2 and +4 O.N. (2) Correct
(3). Incorrect as all belongs to `6^(th)` period. (4) True due to lanthanide contraction.
(5). Incorrect as basicing decreases from `Ce(OH)_(3)` to `Lu(OH)_(3)` BECOMES of fazans rule.
6. Correct
7. Correct
8. All lanthanides have -ve S.R.P. hence all releases hydrogen.
Discussion
4.

How many % of H_2O_2 present in commercially marketed H_2O_2 at STP ?

Answer»

`10%`
`20%`
`30%`
`40%`

ANSWER :C
Discussion
5.

How many of following elements get disproportionated in strongly alkaline medium solution? S,Ne,P,H,CI,F,O,N

Answer»

<P>

SOLUTION :`S, P,CI`
Discussion
6.

How many octahedral voids are there in 1 mole of a compound having cubic close packed structure ?

Answer»

SOLUTION :No. of OCTAHEDRAL voids = No. of atoms in the PACKING = 1 MOLE =`6.02xx10^23`
Discussion
7.

How many O-atoms are shared per SiO_(4) tetrahedra in silicate anion of beryl mineral ?

Answer»


4
3
2

Answer :A
Discussion
8.

How many nutrons are there in hydrogen ?

Answer»

0
3
4
5

Answer :A
Discussion
9.

How many number of tetrahedral voids are completely inside the HCP unit cell

Answer»


ANSWER :8
Discussion
10.

How many number of P, O and H respectively on L.H.S. and R.H.S in following redox reaction after balanced ? P_(4)+OH^(-)toPH_(3)+H_(2)PO_(2)^(-)

Answer»

P = 16, O = 12, H = 34
P = 4, O = 3, H = 3
P = 4, O = 6, H = 9
P = 4, 0 = 6, H = 6

Solution :(i) `underset((0))(P_(4))+OH^(-)tounderset((-3))(PH_(3))+underset((+1))(H_(2)PO_(2)^(-))`
(ii) `underset("Increase of "(4)xx1)(underset((0))(P_(4))+underset((0))(P_(4))+OH^(-)tounderset((-12))(4PH_(3))+underset((+4))(4H_(2)PO_(2)^(-)))`
(iii) `underset("DECREASE of "(12)xx1)(underset((0))(P_(4))+underset((0))(P_(4))+OH^(-)tounderset((-12))(4PH_(3))+underset((+4))(4H_(2)PO_(2)^(-)))`
(iv) `P_(4)+3P_(4)+OH^(-)to4PH_(3)+12H_(2)PO_(2)^(-)`
(v) `4P_(4)+12OH^(-)+12H_(2)Oto4PH_(3)+12H_(2)PO_(2)^(-)`
`P_(4)+3OH^(-)+3H_(2)OtoPH_(3)+3H_(2)PO_(2)^(-)`
Discussion
11.

How many number of molecule are there in 4.4 g of CO_(2)gas ? (C = 12, O = 16g/mole)

Answer»

`6.022xx10^(21)`
`6.022xx10^(22)`
`6.022xx10^(24)`
`6.022xx10^(23)`

SOLUTION :`4.4 g CO_(2) ` gas
Discussion
12.

How many number of atoms present in half of HCP unit cell

Answer»


Solution :`3 XX (1)/(2) + (1)/(6) xx 6 + (1)/(2) xx 1 = 3`
Discussion
13.

How many number of carbon atoms present in 250 gm CaCO_(3) ?

Answer»




ANSWER :`15.055xx10^(23)` CARBON ATOM
Discussion
14.

How many number of atoms are present in fcc unit cell ?

Answer»

4
3
2
1

Solution :In FACE CENTRED cubic structure 8 ATOMS at corner and six at the centre of each are PRESENT, the contribution will be
`= 8xx(1)/(8)+6xx(1)/(2)=1+3=4` atoms per unit cell.
Discussion
15.

How many number of atom effectively present in a cubic unit formed by arrangement of eight B.C.C unit cell

Answer»


ANSWER :16
Discussion
16.

How many number octahedral voids are effectively inside an HCP unit cell

Answer»


ANSWER :6
Discussion
17.

How many nucleous are present in an atom of Nobelium, ._(102)^(254)No ? How many electrons are present n the atom ? How many nucleons may be considered as neutrons?

Answer»

Solution :Nucleous = 254, ELECTRONS = 102 and neutrons `= 254 - 102 = 152`
Discussion
18.

How many ‘nodes’ are there in 3s orbital ?

Answer»

3
2
1
zero

Solution :no of NODES =n-1 for 3s ORBITAL n=3 `therefore` 3-1 =2 nodes
Discussion
19.

How many nodes are present in 3p-orbital, Represent diagrammatically

Answer»

SOLUTION :Number of PLANAR NODES = 1 (because for p-orbital, `l = 1` and number of planar nodes = value of l for that orbital)
Number of radial/spherical nodes `= N - l - 1 = 3 - 1 - 1 =1`
`:.` Total number of nodes in 3p -orbital `= n -1 = 3 - 1 = 2`
Discussion
20.

Howmanynods are therein 4sand 3s ?

Answer»

SOLUTION :There are 3 nodin 4S and2 NODS in 3s
Discussion
21.

How many nodes are possible for 2z orbtial?

Answer»

1
2
3
zero

Answer :A
Discussion
22.

How many no. of sigma and pi bond are in the following ? (CN)_(2)- C= C - (CN)_(2)

Answer»

`7 SIGMA, 2PI`
`9 sigma, 9 pi`
`5sigma, 8pi`
`10sigma, 1pi`

ANSWER :B
Discussion
23.

How many nodal planes are present in pi (2p_(x)) and pi^(**) (2p_(x)) molecular orbitals ?

Answer»

SOLUTION :ONE and TWO RESPECTIVELY .
Discussion
24.

How many nodal planes and nodal regions are present for 3p orbital?

Answer»

SOLUTION :NUMBER of nodal planes for any p-orbial is 1
Number of nodal regions `=n-2=3-2=1`.
Discussion
25.

How many no. of sigma and pi bond are in ethene respectively?

Answer»

5 and 1
1 and 5
6 and 1
4 and 2

Answer :A
Discussion
26.

How many no. of active hydrogen atoms are present in a compound (mol. Mass 90) 0.45 g of which when treated with Na metal liberates 112 ml of the H_(2) gas at STP

Answer»


ANSWER :no. of activef H=2
Discussion
27.

How many neutrons are there in nucleus of tritium ?

Answer»

0
2
3
1

Answer :B
Discussion
28.

How many neutrons are there in ""_(38)^(88)Sr ?

Answer»

38
50
126
88

Solution :In `._(38)^(88)SR`
ATOMIC NUMBER = No. of protons = No. of electrons = 38
Atomic mass = 88
Number of neutrons = 88 - 38 = 50
Discussion
29.

How many neutrons are present in ._(92)U^(238)?

Answer»

SOLUTION :`n = A - Z = 238 - 92 = 146`
Discussion
30.

How many neutrons and protons respectively are present in the ._(6)C^(13) nuclei ?

Answer»

`6,13`
`6,7`
`13,6`
`7,6`

ANSWER :D
Discussion
31.

How many neutrons and protons are there in the following nuclei ? ._(6)^(13)C, ._(8)^(16)O, ._(12)^(24)Mg, ._(26)^(56)Fe, ._(38)^(88)Sr

Answer»

SOLUTION :
Discussion
32.

How many neutorns and protons are there in the following nuclei? ._(6)^(13)C, ._(8)^(16)C, ._(12)^(24)Mg, ._(26)^(56)Fe, ._(38)^(88)Sr

Answer»

SOLUTION :
Discussion
33.

How manyneutrons andprotonsare therein the followingnuclei. ._(6)^(13) C, ._(8)^(16) O , ._(12)^(24) Mg, ._(38)^(88) Sr

Answer»

SOLUTION :PROTONS andneutronsare innucleiare asunderin table
Discussion
34.

How many monobromo derivatives are obtained when 2-methylbutane is subjected to photobromination ?

Answer»

Solution :The NUMBER of different monohalogen derivatives OBTAINED from any alkane depends upon the number of different types of HYDROGENS it contains. Now 2-methylbutane contains four different SETS of equivalent hydrogens (as shown by encircled integers ) and hencegives four monobromo derivatives on photobromination.
Discussion
35.

How many monochlorinated product of methyl cyclohexane are optically active.

Answer»


SOLUTION :
Discussion
36.

How many moles of water is produced during combustion of 8 gm of CH_(4) ?

Answer»

`0.5`
`1`
`2`
`18`

ANSWER :B
Discussion
37.

How many moles of water is present in IL of water?

Answer»

1
18
55.55
5.555

Solution :1 LITRE of water = 1000 g.
Molar mass of water = 18G
NUMBER of moles=`("Mass")/("Molar Mass")=1000/18=55.55` moles
Discussion
38.

How many moles of solute particles are present in one litre of 10^(-4)MK_(2)SO_(4)?

Answer»

Solution : In`10^(-4)MK_(2)SO_(4)` solution, there are `10^(-4)` moles of potassium SULPHATE. `K_(2)SO_(4)` MOLECULE contains 3 IONS `(2K^(+) and 1 SO_(4)^(2-))`
1 mole of `K_(2)SO_(4)` contains `3 xx 6.023xx 10^(23)`ions
`10^(-4)` mole of`K_(2)SO_(4)`contains `3xx6.023xx10xx10^(-4)+ ions= 18.069xx10^(19)`
Discussion
39.

How many moles of solute particles are present in one litre of10^(-4 )M potassium sulphate ?

Answer»

Solution :In `10 ^(-4)M K _(2) SO _(4)` solution, there are `10 ^(-4)` moles of potassium sulphate.
`K _(2)SO _(4)` molecule contains 3 ions `(2 K ^(+) and 1 SO _(4) ^(2-))`
1 MOLE of `K _(2) SO _(4)` contains `3 XX 6. 023 xx 10 ^(23)` ions
`10 ^(4) ` mole of `K _(2) SO _(4)` contaisn `3 xx 6.023 xx 10 ^(23) xx 10 ^(-4) ` ions `= 18.069 xx 10 ^(19)`
Discussion
40.

How many moles of P_(4)O_(6) and P_(4)O_(10) will be produced by the combustion of 12.4gm of phosphorus in 12.8gm of O_(2), leaving no P_(4) or O_(2)? [Atomic wt. P=31]

Answer»

0.11 MOL and 0.3 mol
0.15mol and 0.25mol
0.05 mol each
0.1 mol each

Answer :C
Discussion
41.

How many moles of solute are required in 300 g solvent to prepare 3 molal solution ?

Answer»

0.01
1
0.09
0.9

Solution :`=("weight of solute (GM)")/("molecular mass " xx "WT. of solvent in kg")`
` 3 = ("MOLE")/("weight of solvent")`
`= ("MALE")/(0.300)`
Mole `= 3 xx 0.3 = 0.9`
Discussion
42.

How many moles of PbCO_(3) are present in 1 mole of white lead

Answer»


Solution :WHITE lead is `2PbCO_(3).Pb(OH)_(2)`
Discussion
43.

How many moles of P_(4) can be produced by reaction of 0.1 mole Ca_(5)(PO_(4))_(3)F,0.36 mole SiO_(2) and 0.90 mole C according to the following reaction? 4Ca_(5)(PO_(4))_(3)F+18SiO_(2)+30Crarr3P_(4)+2CaF_(2)+18CaSiO_(3)+30CO

Answer»

`0.060`
`0.030`
`0.045`
`0.075`

Solution :`4Ca_(5)(PO_(4))_(3)F+18SiO_(2)+30C`
`{:((0.1)/(4),(0.36)/(18),(0.9)/(30)),(=0.025,0.02,0.03):}`
`THEREFORE SiO_(2)` is the LR
`18SiO_(2)rarr3P_(4)implies0.36rarr0.06P_(4)`
Discussion
44.

How many moles of oxygen are present in a 550 cm^3 sample of a gas at a pressure of 1.5 atm and at a temperature of 27^@C? (Given, R = 8.31 kPa dm^3 K^(-1) mol^(-1)).

Answer»

Solution :Since the value of R is given in k Pa `dm^3 K^(-1) mol^(-1)` (SI unit), the units of pressure and volume must correspond to it i.e., pressure should be EXPRESSED in k Pa and volume in `dm^3`. Therefore,
`P= 1.5 atm = 1.5 xx 101.325 = 152 k Pa "" ( :. 1 atm = 101.325 k Pa)`
`V = 550 cm^3 = 550 xx 10^(-3) dm^3 = 0.550 dm^3 ( :. 1 cm^3 = 10^(-3) dm^3)`
`T = 27^@C = 273 + 27 = 300 K " and " N` = ?
ACCORDING to the ideal gas equation,
PV = nRT
or `n= (PV)/(RT)=( 152 xx 0.550)/( 8.31 xx 300) =3.35xx10^(-2)` moles.
Discussion
45.

How many moles of oxygen gas can be produced during electricity decomposition of 180 g of water ?

Answer»

2.5 moles
5 moles
10 moles
7 moles

Solution :`underset(2xx18=36g)(2H_2O) to 2H_2 + O_2`
36 g of water produces 1 MOLE of `O_2` GAS
180 g of water will produce 180/36 = 5 moles of `O_2` gas.
Discussion
46.

How many moles of oxygen atoms are present in 75 grams of pure calcium carbonate?

Answer»

Solution :100G of `CaCO_(3)` moles of .O. ATOMS
75 G of `CaCO_(3) =?`
Number of moles of .O. atoms `=(75)/(100)xx3=2.25`
Discussion
47.

How many moles of oxygen are given by the complete decomposition of1.225 g KClO_3?

Answer»

Solution :`2KClO_3to2KCl+3O_2`2 moles` to` 2 moles+3moles 2MOLES `KClO_3`given 3 moles of `O_(2) 2xx122.5gKClO_3`given 3 moles of `O_2` NUMBER of moles of OXYGEN FORMED from `1.225gKClO_3=(3xx1.225)/(2xx122.5)=0.015 mol`
Discussion
48.

How many moles of oxygen are contained in one litre at S.T.P. of air if its volume content is 21% in air

Answer»


Solution :The volume of OXYGEN in 1 litre of air at S.T.R
`=(1 xx 21)/100 = 0.21 L`
`therefore` 22.4 L of oxygen at S.T.P. contain moles =1
`therefore 0.2 L` of oxygen at S.T.P. will contain moles
`=1/(22.4) xx 0.21 = 9.4 xx 10^(-3)`
Hence, ONE litre of air at S.T.R contains `9.4 xx 10^(-3)`moles of oxygen.
Discussion
49.

How many moles of OH^(-) are present in the balanced equation? Cr(OH)_(3)+H_(2)O_(2)overset(OH^(-))rarr H_(2)O+CrO_(4)^(-2)

Answer»

Solution :The BALANCED equation is
`2Cr(OH_(3)) +3H_(2)O_(2)+4OH^(-) to 2CrO_(4)^(-2)+8H_(2)O`
NUMBER of MOLES of hydroxyl `(OH^(-))` required in the balanced equation =4
Discussion
50.

How many moles of NO_(2) are produced when mole of 'B' react with HNO_(3) ?

Answer»


Solution :`3HNO_(3)+B to H_(3)BO_(3)+3NO_(2)`
Discussion