100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 357 InterviewSolution

17801.	Assertion: `0.1 M NaCN+0.05 M HCl` solution on mixing in equal volume forms a buffer solution. Reason : The solution after mixing contains a weak acid and its conjugate base and thus acts as buffer.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False
Answer» Correct Answer - A

Discussion

17802.	One mixing `500 mL` of `10^-6 M Ca^(2+)` ion and `500 mL` of `10^-6 MF^-` ion, no precipitate of `CaF_2` will be obtained. `K_(sp) (CaF_2 = 10^-18)`. If `K_(sp)` is greater than ionic product, a percipitate will develop.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False
Answer» Correct Answer - C

Discussion

17803.	Assertion : The `pH` of pure water is less than `7` at `60^(@)C`. Reason : As the temperature increases, pure water becomes slightly acidic.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False
Answer» Correct Answer - C

Discussion

17804.	For which of the following salt pH of its aqueous solution is independent of concentration of salt.A. `Na_(2)HPO_(3)`B. `NaH_(2)PO_(2)`C. `CH_(3)COONH_(4)`D. `CH_(3)COONa`
Answer» Correct Answer - C `2AB_(2)iff2AB +B_(2)` `"1 0 0"` `"1-x x "x//2` Total moles at equilibrium = `1 + (x)/(2)` `k_(p)=(((x)/(1+x//2)xxP)^(2)((x//2)/(1+x//2)xxP))/(((1-x)/(1+x//2)xxP)^(2)), k_(p)=(x^(3)P)/(2) " , "x^(3)=(2k_(p))/(P)implies x=((2k_(p))/(P))^(1//3)`

Discussion

17805.	If pH of an acidic indicator solution when `50%` ionized is 2. Calculate % of basic form in the solution when `[H^(+)]` = `5xx10^(-3)` in solution at same temperatureA. `33.33%`B. `66.66%`C. `50%`D. `75%`
Answer» Correct Answer - D `AlF_(3) rarr` ionic solid (following octet rule) `PCl_(3).NH_(4)^(+)rarr` following actet rule `SF_(4) rarr` Hypervalent `(10e^(-))`

Discussion

17806.	Order of rate of electrophilic substitution reaction is : A. `1gt2gt3gt4`B. `4gt3gt2gt1`C. `2gt1gt4gt3`D. `2gt1gt3gt4`
Answer» Correct Answer - B `h=sqrt((kw)/(k_(b)xxc))=sqrt((10^(-14))/(10^(-5)xx0.1))=10^(-4)`

Discussion

17807.	Which one of the following characteristics belongs to an electrophile?A. It is any species having electron deficiency, which reacts at an electron rich C-centreB. It is any species having electron enrichment, that reacts at an electron deficient C-centreC. It is cationic in natureD. It is anionic in nature
Answer» Correct Answer - A

Discussion

17808.	Carbocation as an intermediate is likely to be formed in the reaction :A. `"Hexene"overset("Anhyd. AlCl"_(3)//HCl)rarr"2-chloro-2-methylpentane"`B. `"Propene"+Cl_(2)overset(hv)rarr"2-chloropropane"`C. `"Ethyl bromide"+KOH(aq.)overset(Delta)rarr"ethyl alcohol"`D. `"Acetone + HCN"overset(.^(-)OH)rarr"acetonecyanohydrin"`
Answer» Correct Answer - A

Discussion

17809.	Which of the following `pK_(a)` values, represents the strongest acid?A. `10^(-4)`B. `10^(-8)`C. `10^(-5)`D. `10^(-2)`
Answer» Correct Answer - D

Discussion

17810.	The heat of atomization of a compound `XY_(3)` in gaseous state is E kJ `mol^(-1)` what is the X-Y bond energy of kJ `mol^(-1)` unit?A. `E`B. `3E`C. `(E)/(3)`D. `(E)/(6)`
Answer» Correct Answer - C `XY_(3)(g)toX(g)+3Y(g):DeltaH=E` kJ `mol^(-1)` `therefore` B.E of `XY=(E)/(3)` as `XY_(3)` contains three X-Y bonds.

Discussion

17811.	`P(g)+2Q(g)toPQ_(2)(g),DeltaH=18kJmol^(-1)` The entropy change of the above reaction `(DeltaS_("system")` is 60 `JK^(-1)mol^(-1))`. At what temperature the reaction becomes spontaneous?A. Below 200 KB. Above 300 KC. Below 300 KD. Above 200 K and below 300 K.
Answer» Correct Answer - B For spontaneous process `DeltaGlt0` `thereforeDeltaH-TDeltaSlt0,DeltaHltTDeltaS` `thereforeTgt(DeltaH)/(DeltaS)=(18000)/(60)=300K`

Discussion

17812.	Solubility product of `BaCl_(2)` is `4xx10^(-9)`. Its solubility in moles//litre would beA. `4xx10^(-3)`B. `3.2xx10^(-9)`C. `10^(-3)`D. `1xx10^(-9)`
Answer» Correct Answer - C `KsP=45^(3)=4xx10^(-9)rArr5=10^(-3)`

Discussion

17813.	Which of the following represent(s) bidentate ligand(s)?A. `o x^(-2)`B. `gly^(-)`C. dienD. `acac^(-)`
Answer» Correct Answer - A::B::C Oxalato, glycinato, acetylacetonato are bidentate ligands. Dien stands for dietheylenetriamine, a tridentate ligand.

Discussion

17814.	Calculate the entropy change for vaporization of water if latent heat of vaporization for water is 2.26 kJ/gram. The `K_(b)` for `H_(2)O` is 0.51 K/molalityA. 26.33cal/moleB. 23.33cal/moleC. 1KJ/moleD. 30cal/mole
Answer» Correct Answer - A `DeltaS_(V)=(RT_(b)M)/(1000K_(b))`

Discussion

17815.	Suppose that in any Bohr atom or ion orbits are only in even number like 2, 4, 6……. The maximum wavelength of radiation emitted in the visible region of gydrogen spectrum should be,A. `4//R`B. `R//4`C. `36//5R`D. `16//3R`
Answer» Correct Answer - D `E alpha (1)/(lambda)` Maximum wavelength radiation means minimum energy radiation which is emitted when transition occurs from `4 rarr 2`. `(1)/(lambda) = R((1)/(4) - (1)/(16))`

Discussion

17816.	Compound which is added to soap to impart antiseptic properties isA. sodium laurylsulphateB. sodium dodecylbenzenesulphonateC. RosinD. Bithional
Answer» Correct Answer - D Bithionol/Bithional is added to the toilet wsoap to remove the bad odour produced by bacterial decomposition of organic matter on the skin.

Discussion

17817.	1.0 mole of Fe reacts completely with 0.65 mole of `O_(2)` to give a mixture of only FeO and `Fe_(2)O_(3)` the mole ratio of ferrous oxide to ferric oxide isA. `2:2`B. `4:3`C. `1:2`D. `2:7`
Answer» Correct Answer - B `underset("a mole")(2Fe)+underset((a)/(2)"mole")(O_(2))tounderset(a)(2FeO)` `underset(b)(4Fe)+underset((3b)/(4))(3O_(2))tounderset((b)/(2))(2Fe_(2)O_(3))` `thereforea+b=1` `(a)/(2)+(3b)/(4)=0.65` `thereforea=0.4` mole `b=0.6` mole `therefore` moles of `FeO=0.4` moles of `Fe_(2)O_(3)=0.3` `therefore` ratio `=4:3`

Discussion

17818.	Mark the correct statements(s) regarding AzeotropesA. At azeotropic composition, vapour phase composition is same as the liquid phase composition.B. Water and `HNO_(3)` can form minimum boiling azeotrope.C. Azeotropes are formed by non-ideal solution.D. Boiling point of azeotropic solutions does not change while boiling thhe solution at constant external pressure. This bahavious is similar to ideal solution.
Answer» Correct Answer - B::C Water and `HNO_(3)` solution shows negative deviation from raoults law and forms maximum boiling azeotrope at a particular composition. Azeotropes are constant boiling mixtures but boiling point of ideal solution changes while boiling. In ideal solution, vapor phase becomes richer in more volatile component,vapour pressure of remaining solution decreases and hence BP increases continuously while boiling.

Discussion

17819.	Which of the following IUPAC names(s) is/are not correctly matched with its formula?A. Dichloridobis(ethane-1,2-diamine)cobalt(III) ion: `[CoCl_(2)(en)_(2)]^(+)`B. Sodium (ethylenediaminetetraacetato)chromate(II): `Na_(2)[Cr(en)(CH_(3)COO)_(4)]`C. Tris(bipyridyl)iron(II) ion: `[Fe(NH_(4)C_(5)-C_(5)H_(4)N)_(3)]^(2+)`D. Ammineaquadibromidocopper(II): `[Cu(NH_(3))(H_(2)O)Br_(2)]`
Answer» Correct Answer - A (A). `Na_(2)[Cr(edta)]` is te correct formula for given name.

Discussion

17820.	Which of the following ion has the highest coagulation power for the sol. Which is obtained by the following reaction? `FeCl_(3)("excess")+NaOHtoSol`A. `Al^(3+)`B. `SO_(4)^(2-)`C. `l^(-)`D. `Na^(+)`
Answer» Correct Answer - B The sol becomes positively charged dur to excess of `Fe^(3+)` ions.

Discussion

17821.	the overall charge present on the cyclic silicate anion `[Si_(6)O_(18)]^(n-)` is:A. 6B. 12C. 18D. 24
Answer» Correct Answer - B Given silicate anion is `[(SiO_(3))^(2-)]_(6)` `:. n = 12`

Discussion

17822.	In the dissociation of N2O4 into NO2, (1+x) varies with the vapour densities ratio D/d as given by
Answer» Correct answer: (D)

Discussion

17823.	Which of the following statement is correct about the cyclic silicate `[Si_(6)O_(18)]^(n-)`?A. the value of n is 12B. each Si atom is bonded with three oxygen atomsC. each oxygen atom is bonded with two Si atomsD. All of these
Answer» Correct Answer - A A

Discussion

17824.	A system works under cyclic process as follow Heat absorbed during the process isA. `(22)/(7)xx10^(2)J`B. `(22)/(7)xx10^(3)J`C. `(22)/(7)xx10^(4)J`D. `(22)/(7)xx10^(5)J`
Answer» Correct Answer - A for cyclic process, du=0 as `q=-ve` `therefore` work is done by the system `thereforeq=-w=` area occupied by circle `=pir^(2)=(22)/(7)xx10^(2)`

Discussion

17825.	What is the unit of rate constant of the reaction for which the above graph is given?A. `s^(-1)`B. `molL^(-1)s^(-1)`C. `molL^(-1)s`D. `mol^(-1)L^(2)s^(-1)`
Answer» Correct Answer - B It is a zero order reaction

Discussion

17826.	Which of the following is a colourless complex ion?A. `[Cu(NH_(3))_(4)]^(2+)`B. `[Cr(H_(2)O)_(6)]^(3+)`C. `[FeF_(6)]^(3-)`D. `[Mn(H_(2)O)_(6)]^(3+)`
Answer» Correct Answer - C Due to stable `t_(2g)^(2)e_(g)^(2)` configuration of `Fe^(3+)` ion.

Discussion

17827.	Which of the following metallurgical process is not needed in order to extract Zn from `ZnCO_(3)`?A. CalcinationB. RoastingC. Carbon reductionD. Distillation.
Answer» Correct Answer - B Roasting is carried out for sulphide ores.

Discussion

17828.	A five digit number divisible by 3 has to be formed using the numerals 0,1,2,3,4 and 5 without repetition. What is the total number of ways in which this can be done?
Answer» A five digit number is divisible by 3 if the sum of the digits constituting the number is divisible by 3. On mental summing up we see that 1,2,3,4,5 is a group and 0,1,2,4,5 another group. First group can form 5! =120 numbers which are divisible by 3 And effective 5 digit number formed by 2nd group will be 5!-4!=96, where 4! is the number of numbers which start with zero. So neglected. Hence required number of 5 digit numbers divisible by 3 is (120+96)=216

Discussion

17829.	For the equilibrium in a closed vessel`" "PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g)`, `K_(p)` is found to be double of `K_(e)` . This is attained when `:`A. `T=24.36K`B. `T=12.18K`C. `T=36.54K`D. `T=27.3K`
Answer» Correct Answer - C

Discussion

17830.	The first and second dissociation constants of a weak diacidic base `B(OH)_(2)` are `1xx10^(-7)` and `1.3xx10^(-14)` respectively. Approximate pH of `0.1M` solution of this base isA. `10`B. `11`C. `8`D. `12`
Answer» Correct Answer - A

Discussion

17831.	predict the product.A. B. C. D.
Answer» Correct Answer - A Nitrous acid reaction with `2^(@)` amine.

Discussion

17832.	Which of the following salt can increase te boiling point of water by maximum extent? (Assume equimolar quantities are added) (Assume complete dissociation of the salts)A. `NaCl`B. `CaCl_(2)`C. `AlCl_(3)`D. `KCl`
Answer» Correct Answer - C It produces maximum number of ions as compared to other salts.

Discussion

17833.	Find the sum of the series 0.9 + 0.91+ 0.92+....to 100 terms
Answer» The given series is in A.P, a=0.9, d=0.91-0.90=0.01, n=100 a₁₀₀ = a₁+(n−1)d a₁₀₀ = 0.9+(100-1)0.01 a₁₀₀ = 0.9+990.01 a₁₀₀ = 0.9+0.99 a₁₀₀ = 1.89 S₁₀₀ = n(a₁+a_n)/2 S₁₀₀ = 100(0.9+1.89)/2 S₁₀₀ = 139.5 Therefore sum of 100 terms of the given series is 139.5

17833.

Find the sum of the series 0.9 + 0.91+ 0.92+....to 100 terms

Answer»

The given series is in A.P,

a=0.9,

d=0.91-0.90=0.01,

n=100

a₁₀₀ = a₁+(n−1)d

a₁₀₀ = 0.9+(100-1)*0.01

a₁₀₀ = 0.9+99*0.01

a₁₀₀ = 0.9+0.99

a₁₀₀ = 1.89

S₁₀₀ = n(a₁+a_n)/2

S₁₀₀ = 100(0.9+1.89)/2

S₁₀₀ = 139.5

Therefore sum of 100 terms of the given series is 139.5

Discussion

17834.	What is the median of 7, 3, 5, 8, 6, 10, 9, 12(a) 8 (b) 7 (c) 6 (d) 7.5
Answer» What is the median of 7, 3, 5, 8, 6, 10, 9, 12 7.5

Discussion

17835.	Volume of cuboid
Answer» Volume of the cuboid = (length × breadth × height)

Discussion

17836.	The perimeter of the base of square pyramid is 40 centimetres and the total length of all its edges is 92 centimetres. Calculate its surface area.
Answer» Base perimeter = 4a = 40 a = 10cm Total length of edges = 92 cm Length of total laterals edge = 92 – 40 = 52 Length of one laterals edge = \(\frac{52}{4}\) = 13 cm Slant height of lateral surfaces is l = \(\sqrt{13^{12} - 5^2}\) = \(\sqrt{169-25}\) = \(\sqrt{144}\) = 12 cm Surface area of pyramid = Base area + 2 x Perimeter of base x length of slant height of lateral surfaces = a² + 1/2 pl = 10² + 1/2 x 40 x 12 = 100 + 240 = 340 cm² OR Surface area of pyramid = a² + 2 al = 10² + 2 × 10 × 12 = 100 + 240 = 340 cm²

17836.

The perimeter of the base of square pyramid is 40 centimetres and the total length of all its edges is 92 centimetres. Calculate its surface area.

Answer»

Base perimeter = 4a = 40

a = 10cm

Total length of edges = 92 cm

Length of total laterals edge = 92 – 40 = 52

Length of one laterals edge = \(\frac{52}{4}\) = 13 cm

Slant height of lateral surfaces is l = \(\sqrt{13^{12} - 5^2}\)

= \(\sqrt{169-25}\)

= \(\sqrt{144}\)

= 12 cm

Surface area of pyramid = Base area + 2 x Perimeter of base x length of slant height of lateral surfaces

= a² + 1/2 pl

= 10² + 1/2 x 40 x 12

= 100 + 240

= 340 cm²

OR

Surface area of pyramid = a² + 2 al

= 10² + 2 × 10 × 12

= 100 + 240

= 340 cm²

Discussion

17837.	The volume of a solid right circular cone is 4928 cm3. If its height is 24 cm, them find the radius of the cone.
Answer» V = 4928 cm³and h = 24 cm Thus, \(\frac{1}{3}\pi r^2h=4928\) r² = 196 \(\Rightarrow\) r = 14cm

17837.

The volume of a solid right circular cone is 4928 cm3. If its height is 24 cm, them find the radius of the cone.

Answer»

V = 4928 cm³and h = 24 cm

Thus,

\(\frac{1}{3}\pi r^2h=4928\)

r² = 196

\(\Rightarrow\) r = 14cm

Discussion

17838.	The figure given below has the total length 20cm height and common diameter 6cm. Find the volume of the figure.
Answer» volume of solid = \(\frac{2}{3}\pi r^3+r^2h+\frac{1}{3}\pi r^2h\) = \(\frac{2}{3}\pi\times3^3+\pi\times3^2\times12+\frac{1}{3}\pi\times3^2\times5\) = \(18\pi+108\pi+15\pi\) = \(141\pi\) cm³

17838.

The figure given below has the total length 20cm height and common diameter 6cm. Find the volume of the figure.

Answer»

volume of solid

= \(\frac{2}{3}\pi r^3+r^2h+\frac{1}{3}\pi r^2h\)

= \(\frac{2}{3}\pi\times3^3+\pi\times3^2\times12+\frac{1}{3}\pi\times3^2\times5\)

= \(18\pi+108\pi+15\pi\)

= \(141\pi\) cm³

Discussion

17839.	Calculate the surface area and volume of a sphere of radius 3 cm.
Answer» Surface area of sphere = 4 π (3)² = 36π cm² Volume = \(\frac{4}{3}\pi r^3\) = \(\frac{4}{3}\times\pi\times(3)^3\) = 36π cm³

17839.

Calculate the surface area and volume of a sphere of radius 3 cm.

Answer»

Surface area of sphere = 4 π (3)² = 36π cm²

Volume = \(\frac{4}{3}\pi r^3\) = \(\frac{4}{3}\times\pi\times(3)^3\) = 36π cm³

Discussion

17840.	Calculate the volume of a sphere of surface area 144 π square centimetre.
Answer» \(4\pi r^2=144\pi,\) \(r^2=\frac{144}{4}=36,\) r = 6 cm Volume of sphere = \(\frac{4}{3}\pi r^3\) = \(\frac{4}{3}\times\pi\times(6)^3=288\pi\) cm³

17840.

Calculate the volume of a sphere of surface area 144 π square centimetre.

Answer»

\(4\pi r^2=144\pi,\) \(r^2=\frac{144}{4}=36,\) r = 6 cm

Volume of sphere = \(\frac{4}{3}\pi r^3\)

= \(\frac{4}{3}\times\pi\times(6)^3=288\pi\) cm³

Discussion

17841.	In a photoelectric experiment, the frequency and intensity of a light source are both doubled. Then consider the following statements. (i) The saturation photocurrent remains almost the same. (ii) The maximum kinetic energy of the photoelectrons is doubled.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1C. Statement-1 is False, Statement-2 is TrueD. Statement-1 is False, Statement-2 is False
Answer» The number of photons incident per unit time remains same hence saturation photo current remains same. If frequency is doubled then kinetic energy of photo electrons is more than doubled.

Discussion

17842.	(d/dx) [sin-1 x] = ?(a) 1/√(1 - x2)(b) -1/√(1 - x2)(c) 1/√(1 + x2)(d) √(1 - x2)
Answer» Answer is (a) 1/√(1 - x²)

Discussion

17843.	∫secx dx=?(a) log\|secx\|+c (b) log\|secx+tanx\|+c (c) log\|secx-tanx\|+c (c) secx tanx+c
Answer» (b) log\|secx+tanx\|+c

Discussion

17844.	(d/dx)[sin2 x] = ?(a) 2 sin x cos x (b) 2 sin x (c) cos2 x (d) sin x cos x
Answer» Answer is (a) 2 sin x cos x

Discussion

17845.	If A=[(1,2,3),(4,5,6)], then which one of the following is equal to A'?(a) [(2,1,3),(5,4,6)] (b) [(4,5,6),(1,2,3)] (c) [(1,4),(2,5),(3,6)] (d) [(3,6),(2,5),(1,4)]
Answer» (c) [(1,4),(2,5),(3,6)]

Discussion

17846.	Integrating factor (I.F.) of the differential equation (dy/dx) - y cos x = sin x cos x(a) e-sin x (b) esin x(c) e- cos x (d) ecos x
Answer» Answer is (a) e^{-sin x}

Discussion

17847.	An objective function in general LPP is(A) Linear function(B) Constant function(C) Non-collinear function(D) None of these
Answer» (A) Linear function

Discussion

17848.	Give the relationship between molecular mass and density of a gas.
Answer» The relationship between molecular mass and density of a gas. d = PM/RT

17848.

Give the relationship between molecular mass and density of a gas.

Answer»

The relationship between molecular mass and density of a gas.

d = PM/RT

Discussion

17849.	In ΔABC, ∠A = 125°,BC = 8 cm. Find the diameter of the circumcircle.
Answer» Draw diameter BD and jon CD. In ΔBCD, sin55° = \(\frac{BC}{BD}\) BD = \(\frac{BC}{sin\,55^\circ}=\frac{8}{0.82}=9.76\)

17849.

In ΔABC, ∠A = 125°,BC = 8 cm. Find the diameter of the circumcircle.

Answer»

Draw diameter BD and jon CD.

In ΔBCD, sin55° = \(\frac{BC}{BD}\)

BD = \(\frac{BC}{sin\,55^\circ}=\frac{8}{0.82}=9.76\)

Discussion

17850.	P(A) + P(A') = ?(a) 0 (b) 1 (c) -1 (d) P(E)
Answer» Answer is (a) 0

Discussion

Explore topic-wise InterviewSolutions in .

For which of the following salt pH of its aqueous solution is independent of concentration of salt.A. `Na_(2)HPO_(3)`B. `NaH_(2)PO_(2)`C. `CH_(3)COONH_(4)`D. `CH_(3)COONa`

If pH of an acidic indicator solution when `50%` ionized is 2. Calculate % of basic form in the solution when `[H^(+)]` = `5xx10^(-3)` in solution at same temperatureA. `33.33%`B. `66.66%`C. `50%`D. `75%`

Order of rate of electrophilic substitution reaction is : A. `1gt2gt3gt4`B. `4gt3gt2gt1`C. `2gt1gt4gt3`D. `2gt1gt3gt4`

Which of the following `pK_(a)` values, represents the strongest acid?A. `10^(-4)`B. `10^(-8)`C. `10^(-5)`D. `10^(-2)`

The heat of atomization of a compound `XY_(3)` in gaseous state is E kJ `mol^(-1)` what is the X-Y bond energy of kJ `mol^(-1)` unit?A. `E`B. `3E`C. `(E)/(3)`D. `(E)/(6)`

`P(g)+2Q(g)toPQ_(2)(g),DeltaH=18kJmol^(-1)` The entropy change of the above reaction `(DeltaS_("system")` is 60 `JK^(-1)mol^(-1))`. At what temperature the reaction becomes spontaneous?A. Below 200 KB. Above 300 KC. Below 300 KD. Above 200 K and below 300 K.

Solubility product of `BaCl_(2)` is `4xx10^(-9)`. Its solubility in moles//litre would beA. `4xx10^(-3)`B. `3.2xx10^(-9)`C. `10^(-3)`D. `1xx10^(-9)`

Which of the following represent(s) bidentate ligand(s)?A. `o x^(-2)`B. `gly^(-)`C. dienD. `acac^(-)`

Calculate the entropy change for vaporization of water if latent heat of vaporization for water is 2.26 kJ/gram. The `K_(b)` for `H_(2)O` is 0.51 K/molalityA. 26.33cal/moleB. 23.33cal/moleC. 1KJ/moleD. 30cal/mole

Suppose that in any Bohr atom or ion orbits are only in even number like 2, 4, 6……. The maximum wavelength of radiation emitted in the visible region of gydrogen spectrum should be,A. `4//R`B. `R//4`C. `36//5R`D. `16//3R`

Compound which is added to soap to impart antiseptic properties isA. sodium laurylsulphateB. sodium dodecylbenzenesulphonateC. RosinD. Bithional

1.0 mole of Fe reacts completely with 0.65 mole of `O_(2)` to give a mixture of only FeO and `Fe_(2)O_(3)` the mole ratio of ferrous oxide to ferric oxide isA. `2:2`B. `4:3`C. `1:2`D. `2:7`

Which of the following ion has the highest coagulation power for the sol. Which is obtained by the following reaction? `FeCl_(3)("excess")+NaOHtoSol`A. `Al^(3+)`B. `SO_(4)^(2-)`C. `l^(-)`D. `Na^(+)`

the overall charge present on the cyclic silicate anion `[Si_(6)O_(18)]^(n-)` is:A. 6B. 12C. 18D. 24

In the dissociation of N2O4 into NO2, (1+x) varies with the vapour densities ratio D/d as given by

Which of the following statement is correct about the cyclic silicate `[Si_(6)O_(18)]^(n-)`?A. the value of n is 12B. each Si atom is bonded with three oxygen atomsC. each oxygen atom is bonded with two Si atomsD. All of these

A system works under cyclic process as follow Heat absorbed during the process isA. `(22)/(7)xx10^(2)J`B. `(22)/(7)xx10^(3)J`C. `(22)/(7)xx10^(4)J`D. `(22)/(7)xx10^(5)J`

What is the unit of rate constant of the reaction for which the above graph is given?A. `s^(-1)`B. `molL^(-1)s^(-1)`C. `molL^(-1)s`D. `mol^(-1)L^(2)s^(-1)`

Which of the following is a colourless complex ion?A. `[Cu(NH_(3))_(4)]^(2+)`B. `[Cr(H_(2)O)_(6)]^(3+)`C. `[FeF_(6)]^(3-)`D. `[Mn(H_(2)O)_(6)]^(3+)`

Which of the following metallurgical process is not needed in order to extract Zn from `ZnCO_(3)`?A. CalcinationB. RoastingC. Carbon reductionD. Distillation.

A five digit number divisible by 3 has to be formed using the numerals 0,1,2,3,4 and 5 without repetition. What is the total number of ways in which this can be done?

For the equilibrium in a closed vessel`" "PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g)`, `K_(p)` is found to be double of `K_(e)` . This is attained when `:`A. `T=24.36K`B. `T=12.18K`C. `T=36.54K`D. `T=27.3K`

The first and second dissociation constants of a weak diacidic base `B(OH)_(2)` are `1xx10^(-7)` and `1.3xx10^(-14)` respectively. Approximate pH of `0.1M` solution of this base isA. `10`B. `11`C. `8`D. `12`

predict the product.A. B. C. D.

Which of the following salt can increase te boiling point of water by maximum extent? (Assume equimolar quantities are added) (Assume complete dissociation of the salts)A. `NaCl`B. `CaCl_(2)`C. `AlCl_(3)`D. `KCl`

Find the sum of the series 0.9 + 0.91+ 0.92+....to 100 terms

What is the median of 7, 3, 5, 8, 6, 10, 9, 12(a) 8 (b) 7 (c) 6 (d) 7.5

Volume of cuboid

The perimeter of the base of square pyramid is 40 centimetres and the total length of all its edges is 92 centimetres. Calculate its surface area.

The volume of a solid right circular cone is 4928 cm3. If its height is 24 cm, them find the radius of the cone.

The figure given below has the total length 20cm height and common diameter 6cm. Find the volume of the figure.

Calculate the surface area and volume of a sphere of radius 3 cm.

Calculate the volume of a sphere of surface area 144 π square centimetre.

(d/dx) [sin-1 x] = ?(a) 1/√(1 - x2)(b) -1/√(1 - x2)(c) 1/√(1 + x2)(d) √(1 - x2)

∫secx dx=?(a) log|secx|+c (b) log|secx+tanx|+c (c) log|secx-tanx|+c (c) secx tanx+c

(d/dx)[sin2 x] = ?(a) 2 sin x cos x (b) 2 sin x (c) cos2 x (d) sin x cos x

If A=[(1,2,3),(4,5,6)], then which one of the following is equal to A'?(a) [(2,1,3),(5,4,6)] (b) [(4,5,6),(1,2,3)] (c) [(1,4),(2,5),(3,6)] (d) [(3,6),(2,5),(1,4)]

Integrating factor (I.F.) of the differential equation (dy/dx) - y cos x = sin x cos x(a) e-sin x (b) esin x(c) e- cos x (d) ecos x

An objective function in general LPP is(A) Linear function(B) Constant function(C) Non-collinear function(D) None of these

Give the relationship between molecular mass and density of a gas.

In ΔABC, ∠A = 125°,BC = 8 cm. Find the diameter of the circumcircle.

P(A) + P(A') = ?(a) 0 (b) 1 (c) -1 (d) P(E)