100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	What is F-centre ?
Answer» . It is the anion vacancy occupied by free electron in metal excess defect

Discussion

2.	What are the co-ordination numbers of octahedral voids and tetrahedral voids ?
Answer» 6 and 4 respectively.

Discussion

3.	Sodium is a member of which group in periodic table ?(a) Group-IA(b) Group-IIA(c) Group-IVA(d) None of these
Answer» Sodium is a member of Group-IA in periodic table.

Discussion

4.	What is the co-ordination number of cation and anion in Caesium chloride (bcc arrangement) ?
Answer» your the answer 8 and 8.

4.

What is the co-ordination number of cation and anion in Caesium chloride (bcc arrangement) ?

Answer»

your the answer

8 and 8.

Discussion

5.	What is emulsion ? How many types of emulsion.
Answer» Emulsions are colloidal solution of two immicible liquids in which dispersion of tinely divided droplets in another liquid occurs. Emulsion have been classified into two types– (i) Oil in water emulsion – In this dispersed phase is oil while the dispersion medium is water. Example – Milk (liquid fat is dispersed in water) (ii) Water in oil Emulsion – In this dispersed phase is water dispersion medium is oil. Example– Butter (water is dispersed into oil)

5.

What is emulsion ? How many types of emulsion.

Answer»

Emulsions are colloidal solution of two immicible liquids in which dispersion of tinely divided droplets in another liquid occurs.

Emulsion have been classified into two types–

(i) Oil in water emulsion – In this dispersed phase is oil while the dispersion medium is water.

Example – Milk (liquid fat is dispersed in water)

(ii) Water in oil Emulsion – In this dispersed phase is water dispersion medium is oil.

Example– Butter (water is dispersed into oil)

Discussion

6.	The shape of XeF4 is–(a) Tetrahedral(b) Square planar(c) Pyramidal(d) LInear
Answer» The shape of XeF₄ is Group-IIA

Discussion

7.	Which of the following give biuret test?(a) Glycine(b) Alanine(c) both (a) and (b)(d) None of these
Answer» (d) None of these The name of the test comes from the name of the compound, biuret, which gives this test. The reaction is not absolutely specific for peptide bond because many compounds containing two carbonyl groups linked through nitrogen or carbon atoms give a positive result.

7.

Which of the following give biuret test?(a) Glycine(b) Alanine(c) both (a) and (b)(d) None of these

Answer»

(d) None of these

The name of the test comes from the name of the compound, biuret, which gives this test. The reaction is not absolutely specific for peptide bond because many compounds containing two carbonyl groups linked through nitrogen or carbon atoms give a positive result.

Discussion

8.	What is meant by the term co-ordination number ? Find the co-ordination number is ccp and bcc.
Answer» It is defined as the number of nearest neighbours of a particle in a close packed structure. Co-ordination number in ccp = 12 Co-ordination number in bcc = 08

8.

What is meant by the term co-ordination number ? Find the co-ordination number is ccp and bcc.

Answer»

It is defined as the number of nearest neighbours of a particle in a close packed structure.

Co-ordination number in ccp = 12

Co-ordination number in bcc = 08

Discussion

9.	Which one of the following elements is found in free state in nature-(a) Sodium(b) Iron(c) Zince(d) Gold
Answer» Gold elements is found in free state in nature.

Discussion

10.	Which one of the following is an alkaline earth element ?(a) Carbon(b) Calcium(c) Zinc(d) Iron
Answer» Calcium is an alkaline earth element .

Discussion

11.	Protective sols are– (a) Lyophilic(b) Lyophobic(c) Both (a) and (b)(d) None of these
Answer» Protective sols are Lyophilic

Discussion

12.	Which one of the metal is liquid at normal temperature ?(a) Zinc(b) Mercury(c) Sodium(d) Water
Answer» Mercury is liquid at normal temperature

Discussion

13.	The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is1 gammexene2 hexacholoroethane3 freon4 DDT
Answer» Answer will be 4 DDT

Discussion

14.	IUPAC name of HO – CH2 – CH2 – OH is (a) Ethylene glycol(b) Ethane-1, 2-diol (c) Ethyl-1, 2-diol(d) Ethylene diol
Answer» IUPAC name of HO – CH₂ – CH₂ – OH is Ethane-1, 2-diol.

Discussion

15.	For a d-electron , the orbital angular momentum is
Answer» Answer: √6 h/2Π Orbital angular momentum is one of the quantum numbers used to specify the position of an electron in an atom. Total orbital angular momentum is the sum of the orbital angular momentum from each of the electrons.

15.

For a d-electron , the orbital angular momentum is

Answer»

Answer: √6 h/2Π

Orbital angular momentum is one of the quantum numbers used to specify the position of an electron in an atom. Total orbital angular momentum is the sum of the orbital angular momentum from each of the electrons.

Discussion

16.	Is it isopentyl or sec-pentyl?
Answer» It is n -pentyl but also we say it as iso pentyl

Discussion

17.	give two examples where carbon atom is sp2 and sp hybridized. explain these hybridizations with the help of orbital pictures
Answer» Examples of sp Hybridization: All compounds of beryllium like BeF₂, BeH_2,BeCl₂ All compounds of carbon-containing triple Bond like C₂H₂. Examples of sp² Hybridization All the compounds of Boron i.e. BF₃, BH₃ All the compounds of carbon containing a carbon-carbon double bond, Ethylene (C₂H₄)

17.

give two examples where carbon atom is sp2 and sp hybridized. explain these hybridizations with the help of orbital pictures

Answer»

Examples of sp Hybridization:

All compounds of beryllium like BeF₂, BeH_2,BeCl₂
All compounds of carbon-containing triple Bond like C₂H₂.

Examples of sp² Hybridization

All the compounds of Boron i.e. BF₃, BH₃
All the compounds of carbon containing a carbon-carbon double bond, Ethylene (C₂H₄)

Discussion

18.	What is metal?
Answer» A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations). Metals are otherwise defined according to their position on the Periodic Table.

Discussion

19.	CH ≡ CH+O3 → X + Zn/CH3COOH →YThe compound Y is:
Answer» Ethyne on ozonolysis gives acetylene ozonide.this on addition of water produces glyoxal.this on reacting with zinc acetic acid gives CH2OH-CH2OH

Discussion

20.	Select the incorrect statement.A. Lime water produces white precipitate with both `CO_(2)^(2-)` and `SO_(3)^(2-)` species.B. Calomel reacts with ammonia solution and forms white precipitate of `Hg_(2)Cl_(2).NH_(3)`C. Both `NO_(3)^(-)` and `NO_(3)^(-)` respond to brown ring test.D. Ferric ions give prussian blue precipitate on adding potassium ferrocyanide solution.
Answer» Correct Answer - 2 `Hg_(2)Cl_(2)+2NH_(4)OHrarrHgdarr("black")+Hg(NH_(2))Cldarr("white")+NH_(4)Cl+2H_(2)O`

Discussion

21.	Assess the cultural consequences of globalization
Answer» At the same time, global economic growth and industrial productivity are both the driving force and the major consequences of globalization. They also have big environmental consequences as they contribute to the depletion of natural resources, deforestation and the destruction of ecosystems and loss of biodiversity.

Discussion

22.	Boron and silicon of very high purity can be obtained through : (1) vapour phase refining (2) electrolytic refining (3) liquation (4) zone refining
Answer» (4) zone refining "Boron" and "Silicon" of very high purity can be obtained through :- zone refining method only. While other methods are used for other metals/ elements i.e. (i) Vapour phase refining (ii) electrolytic refining (iii) liquation etc.

22.

Boron and silicon of very high purity can be obtained through : (1) vapour phase refining (2) electrolytic refining (3) liquation (4) zone refining

Answer»

(4) zone refining

"Boron" and "Silicon" of very high purity can be obtained through :- zone refining method only. While other methods are used for other metals/ elements i.e.

(i) Vapour phase refining

(ii) electrolytic refining

(iii) liquation etc.

Discussion

23.	Politics is systematic study of
Answer» Political science, the systematic study of governance by the application of empirical and generally scientific methods of analysis. As traditionally defined and studied, political science examines the state and its organs and institutions.

Discussion

24.	Write two features of behaviourlism?
Answer» (1) Regularities; (2) Verification; (3) Techniques; (4) Quantification; (5) Values; (6) Systematisation; (7) Pure Science; and (8) Integration.

Discussion

25.	Determine total number of atoms in per unit formula of (A), (B) & (C).
Answer» The answer is (18.00) (A) = CrO₂Cl₂ (B) = Na₂CrO₄ (C) = CrO₅

25.

Determine total number of atoms in per unit formula of (A), (B) & (C).

Answer»

The answer is (18.00)

(A) = CrO₂Cl₂

(B) = Na₂CrO₄

(C) = CrO₅

Discussion

26.	Calculate ΔfH° (In kJ/mol) for C2H6(g), if ΔcH° [C(graphite)] = –393.5 kJ/mol,ΔCHº [H2(g)] = –286 kJ/mol and ΔCHº [C6H6(g)] = –1560 kJ/mol
Answer» The answer is (–85.00) C₆H₂(g) + 3.5O₂(g) →2CO₂(g) + 3H₂O(l) 2 × (–393.5) + 3 × (–286) – (–1560) = –85 kJ/mol

26.

Calculate ΔfH° (In kJ/mol) for C2H6(g), if ΔcH° [C(graphite)] = –393.5 kJ/mol,ΔCHº [H2(g)] = –286 kJ/mol and ΔCHº [C6H6(g)] = –1560 kJ/mol

Answer»

The answer is (–85.00)

C₆H₂(g) + 3.5O₂(g) →2CO₂(g) + 3H₂O(l)

2 × (–393.5) + 3 × (–286) – (–1560) = –85 kJ/mol

Discussion

27.	A primary reason why nation conduct international trade
Answer» The primary reason for engaging in international trade is the unequal distribution of resources among nations. In general, a nation satisfies the demands for a scarce resource by trading with a more abundant local resource.

Discussion

28.	‘Decentralization has helped to deepen the democracy in India.’ Evaluate this statement with examples.
Answer» Decentralization in about 1992 In 73rd and 74th amendment the Constitution allowed to about 18 years to vote. About 1/6th part seat reserved for woman. Decentralization refers to shift of power from centre to the lower levels. It basically means the power is not accumulated at higher authority but it is divided among the lower levels of the system. Democracy is form of government where people choose their representative. A leader who can make laws and policies that look after their aspirations and welfare of its people. Decentralization helps by preventing us from having a command economy where decisions are taken at the centre and are applied all over the nation without knowing and admiring the root level problems at villages and districts. the best example of decentralization is the 'Kerala model' of planning which was based on decentralized planning. it basically focus on active people participation in planning for the development of their state. this is the reason why Kerala state is able to achieve total literacy rate, high life expectancy, low infant and female mortality rate and low birth rates. Another example is the 3rd tier introduced in India known as Panchayati Raj system by 73rd and 74th amendment which helps in more involvement of people in decision making procedure. Hence Decentralization strengthens democracy.

28.

‘Decentralization has helped to deepen the democracy in India.’ Evaluate this statement with examples.

Answer»

Decentralization in about 1992

In 73rd and 74th amendment the Constitution allowed to about 18 years to vote.
About 1/6th part seat reserved for woman.

Decentralization refers to shift of power from centre to the lower levels.
It basically means the power is not accumulated at higher authority but it is divided among the lower levels of the system.
Democracy is form of government where people choose their representative.
A leader who can make laws and policies that look after their aspirations and welfare of its people.
Decentralization helps by preventing us from having a command economy where decisions are taken at the centre and are applied all over the nation without knowing and admiring the root level problems at villages and districts.
the best example of decentralization is the 'Kerala model' of planning which was based on decentralized planning. it basically focus on active people participation in planning for the development of their state. this is the reason why Kerala state is able to achieve total literacy rate, high life expectancy, low infant and female mortality rate and low birth rates.
Another example is the 3rd tier introduced in India known as Panchayati Raj system by 73rd and 74th amendment which helps in more involvement of people in decision making procedure.
Hence Decentralization strengthens democracy.

Discussion

29.	Discuss the functions of the welfare state in the contemporary era
Answer» Functions of welfare state in the contemporary era was reduced from welfare state to a minimalist state due to introduction of globalization. before globalizations the state works for the economic and social welfare of the people like promote equality, protect domestic producers, ensure good economic conditions by providing huge subsidies and promote the socially and economically backward people. but in the contemporary era, the state reduced its role to maintenance of law and order and security of the people. It has now more tilted towards attracting MNC's and foreign direct investment (e.g. SEZ- special economic zones made ignoring labour laws) . now the prices are decided by the market forces. thus a reduced role of government is seen in the contemporary era and policies made are generally have economic benefits rather than welfare of people.

Discussion

30.	There are two compounds A and B of molecular formula C9H18O3. A has higher boiling point than B. What are the possible structures of A and B?
Answer» The answer is (2) In (A), extensive inter-molecular H-bonding is possible while in (B) there is no Inter-molecular Hbonding.

30.

There are two compounds A and B of molecular formula C9H18O3. A has higher boiling point than B. What are the possible structures of A and B?

Answer»

The answer is (2)

In (A), extensive inter-molecular H-bonding is possible while in (B) there is no Inter-molecular Hbonding.

Discussion

31.	Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are : (a) CaO + SiO2 → CaSiO3 (b) 3Fe2O3 + CO → 2Fe3O4 + CO2 (c) FeO + SiO2 → FeSiO3 (d) FeO → Fe + 1/2O2 (1) (c) and (d) (2) (a) and (d) (3) (d) (4) (a)
Answer» Answer is (1) (c) and (d) In blast furnace (metallugy of iron) involved reactions are (a) CaO + SiO₂ → CaSiO₃ (b) 3Fe₂O₃ + CO → 2Fe₃O₄ + CO₂ Answer is(1) (c) and (d)

31.

Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are : (a) CaO + SiO2 → CaSiO3 (b) 3Fe2O3 + CO → 2Fe3O4 + CO2 (c) FeO + SiO2 → FeSiO3 (d) FeO → Fe + 1/2O2 (1) (c) and (d) (2) (a) and (d) (3) (d) (4) (a)

Answer»

Answer is (1) (c) and (d)

In blast furnace (metallugy of iron) involved reactions are

(a) CaO + SiO₂ → CaSiO₃

(b) 3Fe₂O₃ + CO → 2Fe₃O₄ + CO₂

Answer is(1) (c) and (d)

Discussion

32.	∫x2/(x2 - 4) dx, x ∈ [5, 3]
Answer» (d) 2 - tan^-1(15/7)

Discussion

33.	A spherical ball of mass `M` moving with initial velocity `u` collides elastically with another ball of mass `M`, which is fixed at one end of `L` shaped rigid massless frame as shown in Fig. (a). The `L` shaped frame contains another mass `M` connected at the other end. The speed of the striking mass after collision isA. `u//7` backwardsB. `u//3` is same directionC. `0`D. `u//2` backwards
Answer» Let `v_(1)` be the velocity of striking mass after collision & `v_(2)` be the velocity of centre of mass of frame after collision by momentum conservation `mv=mv_(1)+2mv_(2)`……(`1`) By angular momentum conservation `mv(L)/(2)=mv_(1)(L)/(2)+mL^(2)omega`.....(`2`) `c=1rArrv=(v_(2)+(L)/(2)omega)-v_(1)`.....(`3`) from (`1`). (`2`) and (`3`) `omega=(4v)/(7L)`, `v_(1)=-(v)/(7)` & `v_(2)=(4v)/(7)`

Discussion

34.	The point with respective position vector 60 i + 3 j, 40i - 8j, xi - 52 j are collinear if x is equal to which of the following?(a) –40 (b) 40 (c) 20 (d) –20
Answer» Correct option: (a) –40

34.

The point with respective position vector 60 i + 3 j, 40i - 8j, xi - 52 j are collinear if x is equal to which of the following?(a) –40 (b) 40 (c) 20 (d) –20

Answer»

Correct option:

(a) –40

Discussion

35.	Which of the following is a polyamide? (a)Teflon (b) Nylon-6,6 (c) Terylene (d) Bakelite
Answer» (b) Nylon-6,6

Discussion

36.	A mixture of `HCI(g), PCI_(3)(g)` and `PCI_(5)(s)` each have equal number of CI-atom then their molar ratio in the mixture is :A. `1 : 3 : 5`B. `1 : 1 : 1`C. `15 : 2 : 3`D. `15 : 5 : 3`
Answer» Correct Answer - D A mixture of `HCI(g), PCI_(3)(g)` ……….. Let there are N atom of CI in each then moles of CI-atoms `= (N)/(N_(A))` `HCI: PCI_(3):PCI_(5)` `(N)/(N_(A)): (1)/(3)(N)/(N_(A)):(1)/(5)(N)/(N_(A))` `15:5:3`

Discussion

37.	Which one of the following polymers is prepared by condensation polymerization? (a) Teflon (b) Rubber (c) Styrene (d) Nylon-6,6
Answer» (d) Nylon-6,6

Discussion

38.	Which of the following pair can be distinguished by NaOH and `I_(2)` (Iodoform test)?A. `CH_(3)-CH_(2) -OH` and `CH_(3)-overset(O)overset(\|\|)C -H`B. `CH_(3)-overset(O)overset(\|\|)C-H` and `CH_(3) -overset(O)overset(\|\|)C-CH_(3)`C. `CH_(3)-OH` and `CH_(3)-CH_(2)-OH`D. none of these
Answer» Correct Answer - C With NaOH and `I_(2)` (Iodorom test) shown by ony `CH_(3)-overset(O)overset(\|\|)C-` and `CH_(3)-overset(OH)overset(\|)C-H-`

Discussion

39.	Which of the following compound will be most reactive toward `S_(N)^(1)` reaction?A. `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-1`B. `CH_(3)-overset(I)overset(\|)(CH)-CH_(3)`C. `Ph-overset(Ph)overset(\|)underset(CH_(3))underset(\|)-I`D. `CH_(3)CH=CH-I`
Answer» Correct Answer - C Rate of `S_(N)^(1) propto` stability of carbocation

Discussion

40.	Arrange the following in order of their reactivity toward decarboxylation with sodalime (i) (ii) `CH_(2)=CH-overset(O)overset(\|\|)C-OH` (iii) `CH-=C-overset(O)overset(\|\|)C-OH` (iv) `CH_(3)-CH_(2)-overset(O)overset(\|\|)C-OH`A. III `gt` I `gt` II `gt` IVB. II `gt` III `gt` IV `gt` IC. I `gt` II `gt` III `gt` IVD. IV `gt` I `gt` III `gt` II
Answer» Correct Answer - A Rate of decarboxylation `propto` stability of carbanion

Discussion

41.	A Solution is prepared by dissolving certain amount of solute in 500 g water. The % by mass of a solutions is 2.38 . Calculate mass of the solute.
Answer» Correct Answer - Mass of the solute =12. 19 g Given : `W_(1)`= Mass of a solvent (water) = 500 g `W_(2)` Mass of a solute =? % by mass = % `(W//W) = 2. 38` Let mass of the solute `=W_(2) =x g` `:.` Mass of the solution `= W_(1) + W_(2) = (500 + x) g` Now per cent by mass of solute `= ("mass of solute")/("mass of solution") xx 100` `= ("mass of solute")/("mass of solvent + mass of solute") xx 100` `:. 2.38 = (X )/((500 + X)) xx 100` `:. 2. 38 (500 + X) =100 x` `:. 2.38 xx 500 + 2.38 X =100 x` `:. 1190 + 2.38 X = 100 x` `:. 100 x -2.38 x= 1190` `:. (100 -2.38) x= 1190` `:. 97 .62 x = 1190` `:. x = (1190)/(96.62) =12.19`

Discussion

42.	Calculate mole fraction of HCI in a solution containing 24.8% of HCI by mass.
Answer» Correct Answer - Mole fraction HCI= 0.1398 Given : % by weight of HCI = 24.8 , Mole fraction of HCI= `X_(HCI)= ?` Consider 100 gram HCI solution . `:.` Weight of a solute (HCI) =24.8 g Weight of a solvent (water) = 100 -24.8 = 75.2 g `:. ` Moles of solvent = `n_(H_(2)O) = .(W_(H_(2)O))/(M_(H_(2)O))=(75.2)/(18) =4.178 mol H_(2)O` Moles of solute `=n_(H_(2)O) =(W_(H_(2)O))/(36.5) =(24.8)/(36.5)=0.6795 mol` `:. ` Total moles in solution `= n_(H_(2)O) + n_(HCI)` `=4. 178 + 0.6795 =4. 8575` Mole fraction of HCI `X_("HCI") =("moles of HCI")/("total moles in solution")` `= (0.6795)/(4.8575)= 0.1398`

Discussion

43.	Mole fraction of urea in its aqueous solution is 0.25 .What is the mass of urea present in 200 g urea solution ? (Molecular mass of urea is 60 g `mol^(-1)`)
Answer» Correct Answer - Mass of urea present =33.33 g Given : Mole fraction of urea = 0.25 Mass of urea in 200 g solution = ? Mole fraction of water = 1- 0.25 =0.75 Mass of urea = 0.25 `xx 60 =15 g` Mass of water = 0.75 `xx 100 = 75 g` `:.` Mass of solution = 15+ 75 = 90 g `:.` 90 g solution contains 15 g urea `:.200` g solution will contain `(200 xx 15)/(90) ` = 33.33 g urea

Discussion

44.	Which metal among the following has the highest packing efficiency?A. IronB. TungstenC. AluminiumD. Polonium
Answer» Correct Answer - C Iron and Tungsten have BCC, Poloniumhas SCC while Al has FCC type structure. The order of packing efficiency is SSC `(52.4%) lt B"CC" (68.04 %) lt F"CC" (74%)`

Discussion

45.	It is important that he _______ his reservations by Saturday. A) will confirm B) confirm C) confirms D) must confirm
Answer» Correct option is B) confirm

Discussion

46.	Calculate mole fraction of solute in its 2 molal aqueous solution .
Answer» Correct Answer - Mole fraction of the solute = 0.0347 Given : Concentration of solution =2 molal = 2 m Hence 2 moles of a solute are present in 1000 grams water . `:. W_(H_(2)O) =100 g` `:.` Number of moles of water `=n_(H_(2)O) =(W_(H_(2)O))/(M_(H_(2)O))` `= (1000)/(18)` `=55.56 `mol `:. ` Total moles in solution `=n_(H_(2)O) + n_(solute)` `=55.56 +2` ` = 57 .56 `mol `:. ` Mole fraction of a solute `=("Number of moles of solute" )/("Total moles in solution ")` `:. X_("solute") =(2)/(56.56) = 0.0347`

Discussion

47.	The vapour pressure of 2.1% solution of a non- electrolyte in water at `100^(@) C` is 755 mm Hg. Calculate the molar mass of the solute .
Answer» Correct Answer - Molar mass of non- electrolyte= 58. 69 g `mol^(-1)` At `100^(@)C` vapour pressure of water `=P_(o)`= 760 mm Hg Vapour pressure of the solutions = P= 755 mm Hg Since the solution is 2.1 by mass Mass of solute (non- electrolyte ) =`W_(2) =2.1 g` Mass of water `=W_(1) =100 -2.1 =97.9 g` Molar mass of water = `M_(1) =18 g mol^(-1)` Molar mass of non- electrolyte `=M_(2)= ?` `(P_(o) -P)/(P_(o)) = (W_(2) xx M_(1))/(W_(1) xx M_(2))` `:. M_(2) = ((P_(o))/(P_(o) - P)) xx (W_(2) xx M_(1))/(W_(1)) = (700xx 2.1 xx 18)/((760 - 755) xx 97.9) = 58.69 g mol^(-1)`

Discussion

48.	What is the volume of consumed during acid hydrolysed of 1.398 kg of sucrose? (Given: molar masses of sucrose water =18, density of water = 1g/`cm^(3)`)A. `0.072 dm^(3)`B. `0.720 dm^(3)`C. `0.18 dm^(3)`D. `0.018 dm^(3)`
Answer» Correct Answer - A Hydrolysis of sucrose is as `C_(12)H_(22)O_(11) + H_(2)O to C_(6)H_(12)O_(6) + C_(6)H_(12)O_(6)` `therefore w = (1368 g xx 18 g)/(343) = 72 g = 72 cm^(3)` `(therefore d = 1g cmp^(-3))` But `1 dm^(3) = 10^(-3) cm^(3)` `therefore` Volume of `H_(2)O = 72 xx 10^(-3) dm^(-3)` `=0.072 dm^(3)`

Discussion

49.	Aqueous solution of NaOH is marked 10% `(w//w)`. The density of the solution is 1.070 g `cm^(-3)`. Calculate (i) molarity and (ii) molality of NaOH.
Answer» Correct Answer - (i) Molarity of NaOH solution =2. 675 M (ii) Molality of NaOH solution = 2.778 m Given : Percentage by weight of NaOH `=10% (w//w)` Density of NaOH solution =D =1.070 g `cm^(-3)` Molar mass of NaOH =40 g `mol^(-1)` (i) Molarity of NaOH solution = ? (ii)Molality of NaOH solution = ? (i) For molarity of solution : Consider 100 g NaOH solution `:. ` Weight `H_(2)O+` Weight of NaOH =100 g `:. ` Weight of `H_(2)O = 100 - 10 = 90 g` Number of moles of NaOH `= (W_(NaOH))/(M_(NaOH))` `:. n_(NaOH) = .(10)/(40)` `=0.25 `mol Density of solution `(D) = ("Weight of solution " )/(" volume of solution " ) = (W)/(V)` `:. V = (W)/(D)` `=(100)/(1.070)` `=93 . 46 cm^(3)` `=0.09346 dm^(3)` Molarity `=(n)/(V)= (0.25)/(0.09346) =2.675 "mol" dm^(-3) (or M)` (ii) For molality of NaOH solution : Molality `=("Molar of NaOH ") /("Mass of solvent in gram ") xx 1000` `=(0.25)/(90) xx 1000` `=2.779 "mol" kg^(-1) (or m)`

Discussion

50.	What will be the value of molality for an aqueous solution of 10% w/W NaOH?A. 2.77B. 5C. 10D. 3.52
Answer» Correct Answer - A `10% w//w to 10g NaOH+90gH_(2)O` `m=((10//40))/(90)xx 1000=2.77`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is F-centre ?

What are the co-ordination numbers of octahedral voids and tetrahedral voids ?

Sodium is a member of which group in periodic table ?(a) Group-IA(b) Group-IIA(c) Group-IVA(d) None of these

What is the co-ordination number of cation and anion in Caesium chloride (bcc arrangement) ?

What is emulsion ? How many types of emulsion.

The shape of XeF4 is–(a) Tetrahedral(b) Square planar(c) Pyramidal(d) LInear

Which of the following give biuret test?(a) Glycine(b) Alanine(c) both (a) and (b)(d) None of these

What is meant by the term co-ordination number ? Find the co-ordination number is ccp and bcc.

Which one of the following elements is found in free state in nature-(a) Sodium(b) Iron(c) Zince(d) Gold

Which one of the following is an alkaline earth element ?(a) Carbon(b) Calcium(c) Zinc(d) Iron

Protective sols are– (a) Lyophilic(b) Lyophobic(c) Both (a) and (b)(d) None of these

Which one of the metal is liquid at normal temperature ?(a) Zinc(b) Mercury(c) Sodium(d) Water

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is1 gammexene2 hexacholoroethane3 freon4 DDT

IUPAC name of HO – CH2 – CH2 – OH is (a) Ethylene glycol(b) Ethane-1, 2-diol (c) Ethyl-1, 2-diol(d) Ethylene diol

For a d-electron , the orbital angular momentum is

Is it isopentyl or sec-pentyl?

give two examples where carbon atom is sp2 and sp hybridized. explain these hybridizations with the help of orbital pictures

What is metal?

CH ≡ CH+O3 → X + Zn/CH3COOH →YThe compound Y is:

Assess the cultural consequences of globalization

Boron and silicon of very high purity can be obtained through : (1) vapour phase refining (2) electrolytic refining (3) liquation (4) zone refining

Politics is systematic study of

Write two features of behaviourlism?

Determine total number of atoms in per unit formula of (A), (B) &amp; (C).

Calculate ΔfH° (In kJ/mol) for C2H6(g), if ΔcH° [C(graphite)] = –393.5 kJ/mol,ΔCHº [H2(g)] = –286 kJ/mol and ΔCHº [C6H6(g)] = –1560 kJ/mol

A primary reason why nation conduct international trade

‘Decentralization has helped to deepen the democracy in India.’ Evaluate this statement with examples.

Discuss the functions of the welfare state in the contemporary era

There are two compounds A and B of molecular formula C9H18O3. A has higher boiling point than B. What are the possible structures of A and B?

Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are : (a) CaO + SiO2 → CaSiO3 (b) 3Fe2O3 + CO → 2Fe3O4 + CO2 (c) FeO + SiO2 → FeSiO3 (d) FeO → Fe + 1/2O2 (1) (c) and (d) (2) (a) and (d) (3) (d) (4) (a)

∫x2/(x2 - 4) dx, x ∈ [5, 3]

The point with respective position vector 60 i + 3 j, 40i - 8j, xi - 52 j are collinear if x is equal to which of the following?(a) –40 (b) 40 (c) 20 (d) –20

Which of the following is a polyamide? (a)Teflon (b) Nylon-6,6 (c) Terylene (d) Bakelite

A mixture of `HCI(g), PCI_(3)(g)` and `PCI_(5)(s)` each have equal number of CI-atom then their molar ratio in the mixture is :A. `1 : 3 : 5`B. `1 : 1 : 1`C. `15 : 2 : 3`D. `15 : 5 : 3`

Which one of the following polymers is prepared by condensation polymerization? (a) Teflon (b) Rubber (c) Styrene (d) Nylon-6,6

Which of the following pair can be distinguished by NaOH and `I_(2)` (Iodoform test)?A. `CH_(3)-CH_(2) -OH` and `CH_(3)-overset(O)overset(||)C -H`B. `CH_(3)-overset(O)overset(||)C-H` and `CH_(3) -overset(O)overset(||)C-CH_(3)`C. `CH_(3)-OH` and `CH_(3)-CH_(2)-OH`D. none of these

Which of the following compound will be most reactive toward `S_(N)^(1)` reaction?A. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-1`B. `CH_(3)-overset(I)overset(|)(CH)-CH_(3)`C. `Ph-overset(Ph)overset(|)underset(CH_(3))underset(|)-I`D. `CH_(3)CH=CH-I`

A Solution is prepared by dissolving certain amount of solute in 500 g water. The % by mass of a solutions is 2.38 . Calculate mass of the solute.

Calculate mole fraction of HCI in a solution containing 24.8% of HCI by mass.

Mole fraction of urea in its aqueous solution is 0.25 .What is the mass of urea present in 200 g urea solution ? (Molecular mass of urea is 60 g `mol^(-1)`)

Which metal among the following has the highest packing efficiency?A. IronB. TungstenC. AluminiumD. Polonium

It is important that he _______ his reservations by Saturday. A) will confirm B) confirm C) confirms D) must confirm

Calculate mole fraction of solute in its 2 molal aqueous solution .

The vapour pressure of 2.1% solution of a non- electrolyte in water at `100^(@) C` is 755 mm Hg. Calculate the molar mass of the solute .

What is the volume of consumed during acid hydrolysed of 1.398 kg of sucrose? (Given: molar masses of sucrose water =18, density of water = 1g/`cm^(3)`)A. `0.072 dm^(3)`B. `0.720 dm^(3)`C. `0.18 dm^(3)`D. `0.018 dm^(3)`

Aqueous solution of NaOH is marked 10% `(w//w)`. The density of the solution is 1.070 g `cm^(-3)`. Calculate (i) molarity and (ii) molality of NaOH.

What will be the value of molality for an aqueous solution of 10% w/W NaOH?A. 2.77B. 5C. 10D. 3.52

Determine total number of atoms in per unit formula of (A), (B) & (C).