100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 329 InterviewSolution

16401.	If 24 men can do a work in 15 days, then in how many days 36 men can do the same work?1. 16 days2. 15 days 3. 11 days4. 10 days
Answer» Correct Answer - Option 4 : 10 days Given: M₁ = 24 D₁ = 15 M₂ = 36 Formula Used: (M₁ × D₁) = (M₂ × D₂) Where M₁ → Initial Men D₁ → Initial day M₂ → Final men D₂ → Final day Calculation: (M₁ × D₁) = (M₂ × D₂) ⇒ 24 × 15 = 36 × D₂ ⇒ D₂ = 10 ∴ The time taken by 36 men to do the same work is 10 days.

16401.

If 24 men can do a work in 15 days, then in how many days 36 men can do the same work?1. 16 days2. 15 days 3. 11 days4. 10 days

Answer» Correct Answer - Option 4 : 10 days

Given:

M₁ = 24

D₁ = 15

M₂ = 36

Formula Used:

(M₁ × D₁) = (M₂ × D₂)

Where M₁ → Initial Men

D₁ → Initial day

M₂ → Final men

D₂ → Final day

Calculation:

(M₁ × D₁) = (M₂ × D₂)

⇒ 24 × 15 = 36 × D₂

⇒ D₂ = 10

∴ The time taken by 36 men to do the same work is 10 days.

Discussion

16402.	If 25 men can do a work in 15 days, then in how many days 15 men can do the same work?1. 36 days2. 25 days3. 31 days4. 32 days
Answer» Correct Answer - Option 2 : 25 days Given: M₁ = 25 D₁ = 15 M₂ = 15 Formula Used: (M₁ × D₁) = (M₂ × D₂) Where M1 → Initial Men D1 → Initial day M2 → Final men D2 → Final day Calculation: (M₁ × D₁) = (M₂ × D₂) ⇒ 25 × 15 = 15 × D₂ ⇒ D₂ = 25 ∴ The time taken by 15 men to do the same work is 25 days.

16402.

If 25 men can do a work in 15 days, then in how many days 15 men can do the same work?1. 36 days2. 25 days3. 31 days4. 32 days

Answer» Correct Answer - Option 2 : 25 days

Given:

M₁ = 25

D₁ = 15

M₂ = 15

Formula Used:

(M₁ × D₁) = (M₂ × D₂)

Where M1 → Initial Men

D1 → Initial day

M2 → Final men

D2 → Final day

Calculation:

(M₁ × D₁) = (M₂ × D₂)

⇒ 25 × 15 = 15 × D₂

⇒ D₂ = 25

∴ The time taken by 15 men to do the same work is 25 days.

Discussion

16403.	Explain why- Aniline dissolves in HCl.
Answer» Ammines are basic nature hence dissolved in HCl acid to for salt. R — NH₂ + HCl ⇌ R — NH₃Cl^-

16403.

Explain why- Aniline dissolves in HCl.

Answer»

Ammines are basic nature hence dissolved in HCl acid to for salt.

R — NH₂ + HCl ⇌ R — NH₃Cl^-

Discussion

16404.	What do you mean by vapour pressure? What happens to the vapour pressure, when (i) volatile solute is dissolved in solution. (ii) non-volatile solute is dissolved in solution?
Answer» Vapour Pressure: Pressure exerted by vapours of a liquid on its child layer at equilibrium is called vapour pressure. (i) When volatile solute is added to another liquid solution then the resultant vapour pressure may increase, decrease or may remain same depending on the strength of solute-solved interaction. (ii) When non-volatile solute is dissolved in solution, net vapour pressure decreases.

16404.

What do you mean by vapour pressure? What happens to the vapour pressure, when (i) volatile solute is dissolved in solution. (ii) non-volatile solute is dissolved in solution?

Answer»

Vapour Pressure:

Pressure exerted by vapours of a liquid on its child layer at equilibrium is called vapour pressure.

(i) When volatile solute is added to another liquid solution then the resultant vapour pressure may increase, decrease or may remain same depending on the strength of solute-solved interaction.

(ii) When non-volatile solute is dissolved in solution, net vapour pressure decreases.

Discussion

16405.	If 12 men can do a piece of work in 15 days, then in how many days will it take 18 men to do the same work?1. 8 days2. 9 days3. 15 days4. 10 days
Answer» Correct Answer - Option 4 : 10 days Given: M₁ = 12 D₁ = 15 M₂ = 18 Formula Used: (M₁ × D₁) = (M₂ × D₂) Where M1 → Initial Men D1 → Initial day M2 → Final men D2 → Final day Calculation: (M₁ × D₁) = (M₂ × D₂) ⇒ 12 × 15 = 18 × D₂ ⇒ D₂ = 10 ∴ The time taken by 18 men to do the same work is 10 days.

16405.

If 12 men can do a piece of work in 15 days, then in how many days will it take 18 men to do the same work?1. 8 days2. 9 days3. 15 days4. 10 days

Answer» Correct Answer - Option 4 : 10 days

Given:

M₁ = 12

D₁ = 15

M₂ = 18

Formula Used:

(M₁ × D₁) = (M₂ × D₂)

Where M1 → Initial Men

D1 → Initial day

M2 → Final men

D2 → Final day

Calculation:

(M₁ × D₁) = (M₂ × D₂)

⇒ 12 × 15 = 18 × D₂

⇒ D₂ = 10

∴ The time taken by 18 men to do the same work is 10 days.

Discussion

16406.	Give one example each for the following. (i) Anti-fertility drugs (ii) Narcotic analgesics.
Answer» (i) The chemicals which prevent the pregnancy in women are called anti-fertility drugs. Example: Mixture of norethindrone and ethynylestradiol (novestrol). (ii) They produce sleep so they are used for the relief of post operative pain, cardiac pain, labour pain in child birth etc. Example: Morphine, heroin, codeine etc.

16406.

Give one example each for the following. (i) Anti-fertility drugs (ii) Narcotic analgesics.

Answer»

(i) The chemicals which prevent the pregnancy in women are called anti-fertility drugs. Example: Mixture of norethindrone and ethynylestradiol (novestrol).

(ii) They produce sleep so they are used for the relief of post operative pain, cardiac pain, labour pain in child birth etc. Example: Morphine, heroin, codeine etc.

Discussion

16407.

Differentiate between thermoplastic and thermosetting polymers. Give one example of each.

Answer»

Thermoplastic	Thermosetting
(i) These are linear and slightly branched long chain molecule.	(i) These polymers are cross linked and heavily branched molecules.
(ii) These can be remoulded again and again. Example: Polythene, polystyrene etc.	(ii) These are not remoulded again. Example: Bakelite, Urea, formaldehyde, resins etc.

Discussion

16408.	In the extraction of Aluminium by electrolysis. (i) Write overall cell reaction.(ii) What is the role of cryolite?
Answer» i) At cathode - Al⁺³ (melt) + 3e^- → Al(l) At anode - C(s) + O^2- (melt) → Co(g) + 2e^- C(s) + 2O^2- (melt) → CO₂ (g) + 4e^- ii) Cryolite (Na₃Al F₆) makes Alumina good conductor of electricity and lowers the melting (fusion) + temperature of Alumina. (i) 2Al₂O₃ + 3C → 4Al + 3CO₂ Al₂O₃ \(\overset{electrolysis}{\longrightarrow}\) 2Al₃+ 3O^2- (ii) Cryolite lowers the melting point of the mixture and increases the conductivity.

16408.

In the extraction of Aluminium by electrolysis. (i) Write overall cell reaction.(ii) What is the role of cryolite?

Answer»

i) At cathode - Al⁺³ (melt) + 3e^- → Al(l)

At anode - C(s) + O^2- (melt) → Co(g) + 2e^-

C(s) + 2O^2- (melt) → CO₂ (g) + 4e^-

ii) Cryolite (Na₃Al F₆) makes Alumina good conductor of electricity and lowers the melting (fusion) + temperature of Alumina.

(i)

2Al₂O₃ + 3C → 4Al + 3CO₂

Al₂O₃ \(\overset{electrolysis}{\longrightarrow}\) 2Al₃+ 3O^2-

(ii)

Cryolite lowers the melting point of the mixture and increases the conductivity.

Discussion

16409.	The geometry, hybridization and magnetic moment of `[Ni(CO)_(4)]` are …. .. And … respectively.A. tetrahedral, `sp^(3)`, zeroB. aquare planar `sp^(3),sqrt(3)`C. tetrahedral `sp^(3),2sqrt(2)`D. square planar `dsp^(2)`. Zero
Answer» Correct Answer - A On applying valence bond theory Ni has electronic configuration `[Ar]3d^(8)4s^(2)` and in presence of CO (strong field ligand) electronic configuration is `3d^(10)` Hybridization is `sp^(3)` and all the electrons are paired.

Discussion

16410.	What are antifertility drugs? Give an example?
Answer» Anti fertility drugs are those chemical compounds which prevent pregnancy in women. Eg: novethin drone

Discussion

16411.	108 g fairly concentrated solution of `AgNO_(3)` is electrolysed by using 0.1 F charge the mass of resulting solution isA. 94 gB. 11.6 gC. 96.4 gD. none
Answer» Correct Answer - C At anode `2HgO(l)to4H^(+)(aq)+O_(2)(g)+4e^(-)` At cathode `Ag^(+)(aq)+e^(-)toAg(s)` Ag deposited out `=0.1mol e=10.8gram` `O_(2)` expelled out `=(0.1)/(4)=0.8gram` total wt. loss of the solution =11.6 gram wt. of remaining solution `=108-11.6=96.4gram`

Discussion

16412.	In the extraction of aluminium by electrolysis? i) Give the composition of electrolyte used ii) Overall cell reaction iii) Role of cryolite
Answer» Removes silica impurity as slg calcium silicate. Cryolite increases conductivity and reduces melting point of Al₂O₃. Aluminium Extraction Cathode: Al³⁺(melt) + 3e^– + al(l) Anode: C(s) + O^2-(melt) CO(g) + 2e C(s) + 2O^2-(melt) CO₂(g) + 2e Overall reaction: 2Al₂O₃ + 3C → 4Al + 3CO₂

16412.

In the extraction of aluminium by electrolysis? i) Give the composition of electrolyte used ii) Overall cell reaction iii) Role of cryolite

Answer»

Removes silica impurity as slg calcium silicate.

Cryolite increases conductivity and reduces melting point of Al₂O₃.

Aluminium Extraction

Cathode: Al³⁺(melt) + 3e^– + al(l)

Anode: C(s) + O^2-(melt) CO(g) + 2e

C(s) + 2O^2-(melt) CO₂(g) + 2e

Overall reaction: 2Al₂O₃ + 3C → 4Al + 3CO₂

Discussion

16413.	36 mL of pure water takes 100 sec to evaporate from a vessel when a heater of 806 watt is used. The `DeltaH_("vaporisation")` of `H_(2)O` is (density of water `=1g//c c)`A. `40.3kJ//mol e`B. 43.2 kJ/moleC. 4.03 kJ/moleD. none
Answer» Correct Answer - A 1 watt=1J/sec Total heat for 36 mL `H_(2)O` `=806xx100` ltbr. `=80600J` `DeltaH_("vaporisation")=(80600)/(36)xx18` `=40300J` or `40.3kJ//mol e`

Discussion

16414.	Which of the following compound is not an actacid?A. Aluminium hydroxideB. CimetidineC. PhenelzineD. RAnitidine
Answer» Correct Answer - C Phenelzine is a tranquilizer. It is not an antacid.

Discussion

16415.	An unknown compound dissolves in conc. Sulphuric acid,but does not decolurise bromine water and does not react with sodium. Which of the following classes of molecules would be have in this manner ?A. AlkeneB. AlcoholC. `R-OR`D. Phenol.
Answer» Correct Answer - C Saturated ehters do not decolourise bromine water and aslo do not react with Na but dissovle in conc. `H_2SO_4` in the form of diethyloxonoum hydrogen sulphate

Discussion

16416.	An unknown compound dissolves in conc. Sulphuric acid and does not reat with sodium. Which of the following classes of molecules would be have in the manner?A. AlkaneB. EtherC. AlcoholD. Phenol.
Answer» Correct Answer - B

Discussion

16417.	A simple mehtod to remove peroxide form ehters is to treat them with an aqueous solutionA. KIB. KCNSC. `Na_(2)S_(2)O_(3)`D. `Br_(2)`
Answer» Correct Answer - A

Discussion

16418.	Which of the following compounds is used as an anesthesia ?A. Ethyl alcoholB. Acetic acidC. Diethyl etherD. Acetic anhydride
Answer» Correct Answer - C

Discussion

16419.	When diethyl ether is heated with dil. `H_(2)SO_(4)` under pressure, it givesA. Propanic acidB. Acetic acidC. Methyl carbinolD. Ethyl hydrogen sulphate
Answer» Correct Answer - C

Discussion

16420.	Two wire of equal length, one of copper and the other of steel, are strecthed side by side by the same tension. So that they produce the same note, their diameters should bear a ratio.(`rho_(Cu)`=8.9 gm/cc and `rho_("steel")`=7.7 gm/cc)A. `1.5:1`B. `1.07:1`C. `1:1.2`D. `1.2:1`
Answer» B `l_(Cu)=l_("steel")` `T_("steel")=T_(Cu)` As v is same, `m_("steel ")=m_(Cu)` `impliesrho_("steel")[(pid_("steel")^(2))/(4)l]=r_(Cu)[(pid_(Cu)^(2))/(4)l]` `(d_("steel"))/(d_(Cu))=sqrt((rho_(Cu))/(rho_("steel")))=sqrt((8.9)/(7.7))=1.07`

Discussion

16421.	Springs of spring constant K,3K,9K,27K,….243K are connected in series. A mass M is attached to the last spring and the system is allowed to make oscillation. The time period will beA. `2pisqrt((M)/(K))`B. `2pisqrt((3M)/(2K))`C. `(4pi)/(9)sqrt((91M)/(3K))`D. `2pisqrt((4M)/(3K))`
Answer» C `(1)/(K_(0))=(1)/(K)+(1)/(3K)+(1)/(9K)+.......+(1)/(243K)` `:. K_(0)=(243K)/(364)` `T=2pisqrt((m364)/(243K))=(4pi)/(9)sqrt((91M)/(3K))`

Discussion

16422.	Financial analysis is used only by the creditors. State True / False.
Answer» False. Financial analysis is used only by the creditors.

Discussion

16423.	Statement-1 :When we dip our hands in a beaker filled partially with water, the force on bottom of beaker increases. Statement-2: The liquid level increases.A. Statement-1 is true, statement-2 is true and statement-2 is corretct explanation for statement-1B. Statement-1 is true, statement-2 is true and statement-2 is NOT correct explanation for statement-1C. Statement-1 is true, statement-2 is falseD. Statement-1 is false, statement-2 is true
Answer» A When we dip our hand in a beaker filled partially with water, the liquid leveld increases. Hence pressure at base increases.

Discussion

16424.	Financial statements generally include: (a) Comparative statement (b) Fund flow statement (c) Income statement and balance sheet (d) None of the above
Answer» (c) Income statement and balance sheet

Discussion

16425.	Ethers in general can be used asA. AnaestheticsB. RefrigerantsC. In perfumesD. In all the above
Answer» Correct Answer - D

Discussion

16426.	Debentures cannot be redeemed out of: (a) Profits (b) Provisions (c) Capital (d) All the above
Answer» (b) Provisions

Discussion

16427.	If the amount brought by a new partner is more than his share in capital, the excess is known as _____
Answer» If the amount brought by a new partner is more than his share in capital, the excess is known as Hidden Goodwill.

Discussion

16428.	What is buy-back of shares?
Answer» Buy – back of shares : Also known as repurchase of shares by the company that issued them or purchase of its own shares from the market.

Discussion

16429.	Give the formula for calculation of new profit sharing ratio on retirement of a partner.
Answer» New profit ratio = Old Ratio + Gain Ratio.

Discussion

16430.	In amorphous solid the meaning of 'amorphous' in greek is A) break B) no from C) no rangeB) short form
Answer» AS PER NCERT, AMORPHOUS IN GREEK MEANS NO FORM.

Discussion

16431.	Which one of the following is least reactive compound for nucleophilic acyl substitution ?
Answer» Correct option is B) The least reactive compound for nucleophilic acyl substitution is represented by option B. This is because methyl amine is poor leaving group. On the other hand, the chloride ion is best leaving group. Hence, the option A is the most reactive compound for nucleophilic acyl substitution. The order of reactivity for nucleophilic acyl substitution is A > D > C > B

16431.

Which one of the following is least reactive compound for nucleophilic acyl substitution ?

Answer»

Correct option is B)

The least reactive compound for nucleophilic acyl substitution is represented by option B.

This is because methyl amine is poor leaving group.

On the other hand, the chloride ion is best leaving group.

Hence, the option A is the most reactive compound for nucleophilic acyl substitution.
The order of reactivity for nucleophilic acyl substitution is

A > D > C > B

Discussion

16432.	Which of the following is known as amorphous solid?(a) Glass(b) Plastic(c) Rubber(d) All of the above
Answer» (d) All of the above Amorphous solid is a solid that lacks an ordered internal structure. glass, rubber and plastics are amorphous solids.

16432.

Which of the following is known as amorphous solid?(a) Glass(b) Plastic(c) Rubber(d) All of the above

Answer»

(d) All of the above

Amorphous solid is a solid that lacks an ordered internal structure. glass, rubber and plastics are amorphous solids.

Discussion

16433.	Which of the following compounds is most reactive towards nucleophilic acyl substitution :-
Answer» Cl is very good leaving group

Discussion

16434.	Which one of the following pairs will form an ideal solution?(a) Chloroform and acetone(b) Ethanol and acetone(c) n-hexane and n-heptane(d) Phenol and aniline
Answer» Option : (c) n-hexane and n-heptane The substance having almost same structure and polarities form nearly ideal solution. Here, n-Hexane and n-heptane can form nearly ideal solution.

16434.

Which one of the following pairs will form an ideal solution?(a) Chloroform and acetone(b) Ethanol and acetone(c) n-hexane and n-heptane(d) Phenol and aniline

Answer»

Option : (c) n-hexane and n-heptane

The substance having almost same structure and polarities form nearly ideal solution.

Here,

n-Hexane and n-heptane can form nearly ideal solution.

Discussion

16435.	Calculate the e.m.f. of the cell in which the following reaction takes place : `Ni(s) +2Ag^(+)(0.002 M)to Ni^(2+)(0.160 M)+2Ag(s)` Given `E_(cell)^(@)`=1.05 vA. 1.05 VB. 0.912 VC. 1.19 VD. 2.05 V
Answer» Correct Answer - B `Ni_((S)) + 2Ag+ to Ni+2 + 2Ag_((S))` `Q=([Ni^(+2)])/([Ag^+]^2) = "0.16"/"(0.002)"^2="0.16"/(2xx10^(-3))^(2)="0.16"/(4xx10^(-6))` `Q=(0.16xx10^6)/4 = (16xx10^4) /4 =4xx104` `E_"cell" =E_"cell"^@ -0.059/n` log Q (From Nernst equation) `E_"cell"=1.05-0.06/2 log (4xx104)` = 1.05 – 0.03{log 4 + `log^(10)`4} = 1.05 – 0.03{0.6 + `4 log_(10)`} = 1.05 – 0.03{4.6} = 0.912 V

Discussion

16436.	A solid dissolves in water exothermically, if its saturated solution at `20^@C` is cooled to `0^@C` then:-A. Some solid separates outB. Some ice separates outC. Both the solid and ice separateD. Neither the solid nor the ice separates out
Answer» Correct Answer - D Due to depression in P.P, water will freeze at a temperature less than `0^@C`.

Discussion

16437.	the compound `Y` can not be prepared by using which of the reagents:A. B. C. D.
Answer» Correct Answer - A::B::D For being functional isomers, functional group should not match. (phenol and aliphatic alcohol are considered as different functional groups).

Discussion

16438.	Mark out the incorrect order of nucleophilicity for given nucleophile:A. `CH_(3)^(ɵ)gtOH^(ɵ)tNH_(2)^(ɵ)gtF^(ɵ)gtI^(ɵ)` (in DMF)B. `I^(ɵ)gtBr^(ɵ)gtCl^(ɵ)gtF^(ɵ)` ( in `H_(2)O`)C. `I^(ɵ)gtF^(ɵ)gtOH^(ɵ)gtNH_(2)^(ɵ)gtCH_(3)^(ɵ)` ( in DMSO)D. `CH_(3)^(ɵ)gtNH_(2)^(ɵ)gtOH^(ɵ)gtF^(ɵ)` (in `H_(2)O)`
Answer» Correct Answer - A::C While moving from left to rigt in periodic table nucleophilicity parallels basicity and from top to bottom nucleophilicity is reverse to basicity.

Discussion

16439.	Which of the following coordination complex is/are diamagnetic?A. `K_(3)[Cu(CN)_(4)]`B. `[CoCl_(4)]^(2-)`C. `[Ni(H_(2)O)_(6)]^(2+)`D. `[Zn(H_(2)O)_(4)]^(2+)`
Answer» Correct Answer - A::D `Cu^(+)` and `Zn^(2+)` have `d^(10)` configuration

Discussion

16440.	Which of te following is/are correct for the water insoluble tellow coloured complex `K_(2)[PtCl_(6)]`?A. It is an innter orbital complex.B. it is high spin complex.C. its IUPAC name is potassium hexachloridoplatinum (IV).D. it is homoleptic complex.
Answer» Correct Answer - A::D For `4d//5d` metals all ligands act as strong field ligand (sfi) `Pt^(4+):5d^(6)`: pairing occurs `d^(2)sp^(3)` inner orbital los spin homoleptic (because only one type of ligand is present) IUPAC name: potassium hexachloridoplatinate (IV) because coordination sphere is anionic.

Discussion

16441.	Which of the following statements is/are correct?A. First law of thermodynamics can be seen as law of conervation of energy. So according to first law, total energy of a system always remains constant.B. `pH` is an extensive property.C. Third law of thermodynamics state that entropy of a chemically pure perfect crystal is zero at `0^(@)C`D. Entropy of an isolated system always increases in an irreversible process.
Answer» Correct Answer - D (A). Total energy of a ISOLATED system remains conserved. (C). Entropy of a chemically pure perfect crystal is zero at. Zero KELVIN. (D). This is one of the statements of second law of thermodynamics.

Discussion

16442.	Find the antonym of word:Barren A) fertile B) dry C) arid D) fruitless
Answer» Correct option is A) fertile

Discussion

16443.	Which of the followig is/are correct regarding the magnitude of crystal field splitting energy `Delta`?A. it depends on the coordination geometry. `Delta` for octahedral `gt` square planar `gt` tetrahedralB. it depends on oxidation number of central atom `M.Delta` for `M^(3+)gtM^(2+)`C. it depends on whether the central atom M belongs to 3 series or `4d//5d` series.D. it depedns on the ligand.
Answer» Correct Answer - B::C::D `Delta` for square planar `gt` octahedral `gt` tetradedral

Discussion

16444.	The effect of absorption of `CO_(2)` gas on acidity of water is explained by following three equilibrium reactions. `CO_(2)gArrCO_(2(aq))` `CO_(2(aq))+H_(2)OhArrH_(aq)^(+)+HCO_(3(aq))^(-)` `HCO_(3(aq))^(-)+H_(2)OhArrH_(3)O_(aq)^(+)+CO_(3)^(2-)` Which of the following will increase the solubility of `CO_(2)` gas in water?A. increasing the temperatureB. increasing partial pressure of `CO_(2)` above waterC. addig `HNO_(3)` in waterD. Adding sodium acetate in water.
Answer» Correct Answer - B::D As T increases, solubility of gases in water decreases. `HNO_(3)` generates `H^(+)` ions which will suppress second ad third reaction, which in turn suppresses first reaction backward, decreasing solubility of `CO_(2)`. Sodium acetate generates `OH^(-)` ions due to hydrolysis of acetate, which will shift second and third reactions forward, increasing solubility of `CO_(2)`

Discussion

16445.	Which of the following solutions will resist change in their pH on moderate dilution?A. A solution which is 0.1 M in `PhNH_(2)` and 0.2 M in `PhNH_(3)^(+)Cl^(-)`B. 0.1 M `NaHCO_(3)`C. A solution obtained by mixing equal volumes of 0.1 M NaOH and 0.2 M PhOH.D. 0.4 M `CH_(3)COONH_(4)`
Answer» Correct Answer - A::B::C::D Buffer solution, solutions of amphi-protic species and solutions of salts of weak acid `+` weak base resist change in their pH on dilution. A is buffer B is amphiprotic species. C is buffer solution of phenol and phenoxide. D is salt of weak acid `+` weak base.

Discussion

16446.	Find the antonym of word:Tough A) hard B) tender C) cruel D) violent
Answer» Correct option is B) tender

Discussion

16447.	Addition of `Hl` will significantly suppress solubility or dissociation or hydrolysis of which of the following ?A. `HF_(aq)`B. `HBr_(aq)`C. Saturated solution of sparingly solution of sparingly soluble salt `Pbl_(2)`D. `HClO_(4(aq))`
Answer» Correct Answer - A::C `Hl` is a strong acid and strong electrolyte. It will suppress dessociation of weak acid, weak electrolyte having any ion common with Hl, due to common ion effect. HF is weak acid, common ion `H^(+)` with Hl. `HClO_(4)` HBr are strong acids. Two strong acids/electrolytes can not suppress each others dissociation even if they have a common ion.

Discussion

16448.	Find the antonym of word:Rebel A) mutiny B) suppress C) fight D) rise up
Answer» Correct option is B) suppress

Discussion

16449.	Calculate the temperature of `4.0 mol` of a gas occupying `5 dm^(3)` at 3.32 bar. Strategy : List the variables with the proper units. Then solve the ideal gas equation for `T` by substituting the values.
Answer» `PV=nRT` `P=3.32 "bar", V=5 dm^(3)` `n=4 mol`, `R=0.083 "bar" dm^(3) K^(-1) mol^(-1)` Therefore `3.32xx5=4xx0.083xxT` or `T=(3.32xx5)/(4xx0.083)=50 K`

Discussion

16450.	Calcualte the mass % of `Na_(2)CO_(3)` in a mixture having mass 206 gm which produces 24 litre of `CO_(2)` at 1 atm pressure and 300K with excess of HCL. [R = 0.08 atm lit/mol K]A. 0.5B. 0.485C. 0.53D. 0.4
Answer» Correct Answer - B

Discussion

Explore topic-wise InterviewSolutions in .

If 24 men can do a work in 15 days, then in how many days 36 men can do the same work?1. 16 days2. 15 days 3. 11 days4. 10 days

If 25 men can do a work in 15 days, then in how many days 15 men can do the same work?1. 36 days2. 25 days3. 31 days4. 32 days

Explain why- Aniline dissolves in HCl.

What do you mean by vapour pressure? What happens to the vapour pressure, when (i) volatile solute is dissolved in solution. (ii) non-volatile solute is dissolved in solution?

If 12 men can do a piece of work in 15 days, then in how many days will it take 18 men to do the same work?1. 8 days2. 9 days3. 15 days4. 10 days

Give one example each for the following. (i) Anti-fertility drugs (ii) Narcotic analgesics.

Differentiate between thermoplastic and thermosetting polymers. Give one example of each.

In the extraction of Aluminium by electrolysis. (i) Write overall cell reaction.(ii) What is the role of cryolite?

The geometry, hybridization and magnetic moment of `[Ni(CO)_(4)]` are …. .. And … respectively.A. tetrahedral, `sp^(3)`, zeroB. aquare planar `sp^(3),sqrt(3)`C. tetrahedral `sp^(3),2sqrt(2)`D. square planar `dsp^(2)`. Zero

What are antifertility drugs? Give an example?

108 g fairly concentrated solution of `AgNO_(3)` is electrolysed by using 0.1 F charge the mass of resulting solution isA. 94 gB. 11.6 gC. 96.4 gD. none

In the extraction of aluminium by electrolysis? i) Give the composition of electrolyte used ii) Overall cell reaction iii) Role of cryolite

36 mL of pure water takes 100 sec to evaporate from a vessel when a heater of 806 watt is used. The `DeltaH_("vaporisation")` of `H_(2)O` is (density of water `=1g//c c)`A. `40.3kJ//mol e`B. 43.2 kJ/moleC. 4.03 kJ/moleD. none

Which of the following compound is not an actacid?A. Aluminium hydroxideB. CimetidineC. PhenelzineD. RAnitidine

An unknown compound dissolves in conc. Sulphuric acid,but does not decolurise bromine water and does not react with sodium. Which of the following classes of molecules would be have in this manner ?A. AlkeneB. AlcoholC. `R-OR`D. Phenol.

An unknown compound dissolves in conc. Sulphuric acid and does not reat with sodium. Which of the following classes of molecules would be have in the manner?A. AlkaneB. EtherC. AlcoholD. Phenol.

A simple mehtod to remove peroxide form ehters is to treat them with an aqueous solutionA. KIB. KCNSC. `Na_(2)S_(2)O_(3)`D. `Br_(2)`

Which of the following compounds is used as an anesthesia ?A. Ethyl alcoholB. Acetic acidC. Diethyl etherD. Acetic anhydride

When diethyl ether is heated with dil. `H_(2)SO_(4)` under pressure, it givesA. Propanic acidB. Acetic acidC. Methyl carbinolD. Ethyl hydrogen sulphate

Two wire of equal length, one of copper and the other of steel, are strecthed side by side by the same tension. So that they produce the same note, their diameters should bear a ratio.(`rho_(Cu)`=8.9 gm/cc and `rho_("steel")`=7.7 gm/cc)A. `1.5:1`B. `1.07:1`C. `1:1.2`D. `1.2:1`

Springs of spring constant K,3K,9K,27K,….243K are connected in series. A mass M is attached to the last spring and the system is allowed to make oscillation. The time period will beA. `2pisqrt((M)/(K))`B. `2pisqrt((3M)/(2K))`C. `(4pi)/(9)sqrt((91M)/(3K))`D. `2pisqrt((4M)/(3K))`

Financial analysis is used only by the creditors. State True / False.

Financial statements generally include: (a) Comparative statement (b) Fund flow statement (c) Income statement and balance sheet (d) None of the above

Ethers in general can be used asA. AnaestheticsB. RefrigerantsC. In perfumesD. In all the above

Debentures cannot be redeemed out of: (a) Profits (b) Provisions (c) Capital (d) All the above

If the amount brought by a new partner is more than his share in capital, the excess is known as _____

What is buy-back of shares?

Give the formula for calculation of new profit sharing ratio on retirement of a partner.

In amorphous solid the meaning of 'amorphous' in greek is A) break B) no from C) no rangeB) short form

Which one of the following is least reactive compound for nucleophilic acyl substitution ?

Which of the following is known as amorphous solid?(a) Glass(b) Plastic(c) Rubber(d) All of the above

Which of the following compounds is most reactive towards nucleophilic acyl substitution :-

Which one of the following pairs will form an ideal solution?(a) Chloroform and acetone(b) Ethanol and acetone(c) n-hexane and n-heptane(d) Phenol and aniline

Calculate the e.m.f. of the cell in which the following reaction takes place : `Ni(s) +2Ag^(+)(0.002 M)to Ni^(2+)(0.160 M)+2Ag(s)` Given `E_(cell)^(@)`=1.05 vA. 1.05 VB. 0.912 VC. 1.19 VD. 2.05 V

A solid dissolves in water exothermically, if its saturated solution at `20^@C` is cooled to `0^@C` then:-A. Some solid separates outB. Some ice separates outC. Both the solid and ice separateD. Neither the solid nor the ice separates out

the compound `Y` can not be prepared by using which of the reagents:A. B. C. D.

Which of the following coordination complex is/are diamagnetic?A. `K_(3)[Cu(CN)_(4)]`B. `[CoCl_(4)]^(2-)`C. `[Ni(H_(2)O)_(6)]^(2+)`D. `[Zn(H_(2)O)_(4)]^(2+)`

Which of te following is/are correct for the water insoluble tellow coloured complex `K_(2)[PtCl_(6)]`?A. It is an innter orbital complex.B. it is high spin complex.C. its IUPAC name is potassium hexachloridoplatinum (IV).D. it is homoleptic complex.

Find the antonym of word:Barren A) fertile B) dry C) arid D) fruitless

Which of the following solutions will resist change in their pH on moderate dilution?A. A solution which is 0.1 M in `PhNH_(2)` and 0.2 M in `PhNH_(3)^(+)Cl^(-)`B. 0.1 M `NaHCO_(3)`C. A solution obtained by mixing equal volumes of 0.1 M NaOH and 0.2 M PhOH.D. 0.4 M `CH_(3)COONH_(4)`

Find the antonym of word:Tough A) hard B) tender C) cruel D) violent

Addition of `Hl` will significantly suppress solubility or dissociation or hydrolysis of which of the following ?A. `HF_(aq)`B. `HBr_(aq)`C. Saturated solution of sparingly solution of sparingly soluble salt `Pbl_(2)`D. `HClO_(4(aq))`

Find the antonym of word:Rebel A) mutiny B) suppress C) fight D) rise up

Calculate the temperature of `4.0 mol` of a gas occupying `5 dm^(3)` at 3.32 bar. Strategy : List the variables with the proper units. Then solve the ideal gas equation for `T` by substituting the values.

Calcualte the mass % of `Na_(2)CO_(3)` in a mixture having mass 206 gm which produces 24 litre of `CO_(2)` at 1 atm pressure and 300K with excess of HCL. [R = 0.08 atm lit/mol K]A. 0.5B. 0.485C. 0.53D. 0.4