46295 + Interview Questions in Chemistry

1.	The mole fraction of solute in 1 molal aqueous solution is:
Answer» The mole fraction of solute in $1$ molal aqueous solution is:

Discussion

2.	Which of these is not an element? 1. On heating it gives off a gas and leaves residue. 2. It burns in air to form carbon dioxide and water. 3. It changes into solid at 273 K and to gas at 373 K. I don't know about elements so can you please explain the answer?
Answer» Which of these is not an element? 1. On heating it gives off a gas and leaves residue. 2. It burns in air to form carbon dioxide and water. 3. It changes into solid at 273 K and to gas at 373 K. I don't know about elements so can you please explain the answer?

2.

Which of these is not an element? 1. On heating it gives off a gas and leaves residue. 2. It burns in air to form carbon dioxide and water. 3. It changes into solid at 273 K and to gas at 373 K. I don't know about elements so can you please explain the answer?

Answer»

Which of these is not an element?

1. On heating it gives off a gas and leaves residue.

2. It burns in air to form carbon dioxide and water.

3. It changes into solid at 273 K and to gas at 373 K.

I don't know about elements so can you please explain the answer?

Discussion

3.	To neutralise completely 20 ml of 0.1 M of aqueous solution of phosphoric acid the volume of 0.1 M aqueous KOH solution required is ??
Answer» To neutralise completely 20 ml of 0.1 M of aqueous solution of phosphoric acid the volume of 0.1 M aqueous KOH solution required is ??

Discussion

4.	The rate constant of a reaction is 1.2×10^-3sec^-1 at 30℃and 2.1×10^-3sec^-1 at 40℃.calculate the energy of activation of the reaction
Answer» The rate constant of a reaction is 1.2×10^-3sec^-1 at 30℃and 2.1×10^-3sec^-1 at 40℃.calculate the energy of activation of the reaction

Discussion

5.	The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY(0.10 M). If λ∘X=λ∘Y the difference in their pKa values, (pKa (HX)−pKa(HY)) is (consider degree of ionization of both acids to be
Answer» The molar conductivity of a solution of a weak acid HX (0.01 M) is $10$ times smaller than the molar conductivity of a solution of a weak acid $H Y (0.10 M)$ . If $λ_{X}^{\circ} = λ_{Y}^{\circ}$ the difference in their $p K_{a}$ values, $(p K_{a} (H X) - p K_{a} (H Y))$ is (consider degree of ionization of both acids to be << 1)

Discussion

6.	40. A 2g sample containing Na2CO3 and NaHCO3 loses 0.248g when heated to 300^° c,the temperature at which NaHCO3 decomposes to Na2CO3,CO2 AND H2O.what is the precentage of Na2CO3 in the given mixture?
Answer» 40. A 2g sample containing Na2CO3 and NaHCO3 loses 0.248g when heated to 300^° c,the temperature at which NaHCO3 decomposes to Na2CO3,CO2 AND H2O.what is the precentage of Na2CO3 in the given mixture?

Discussion

7.	What is the relation between the radius of circle 'r' and side of the square 'a' in this figure?If x∗r=a, type x.___
Answer» What is the relation between the radius of circle 'r' and side of the square 'a' in this figure? If $x * r = a$ , type x. ___

7.

What is the relation between the radius of circle 'r' and side of the square 'a' in this figure?If x∗r=a, type x.___

Answer»

What is the relation between the radius of circle 'r' and side of the square 'a' in this figure?

If $x * r = a$ , type x.

___

Discussion

8.	Oxidation state of C in pyrene
Answer» Oxidation state of C in pyrene

Discussion

9.	How to identify whether a compound will undergo d-d transitions or not? Please explain with examples!
Answer» How to identify whether a compound will undergo d-d transitions or not? Please explain with examples!

Discussion

10.	Rate of effusion of an ozonised sample is 0.95 times rate of effusion of pure oxygen . Mass% of ozone in ozonised sample is ?
Answer» Rate of effusion of an ozonised sample is 0.95 times rate of effusion of pure oxygen . Mass% of ozone in ozonised sample is ?

Discussion

11.	In which of the following compounds, keto form is more dominating than enol form?
Answer» In which of the following compounds, keto form is more dominating than enol form?

Discussion

12.	The major products A and B in the following set of reactions are
Answer» The major products A and B in the following set of reactions are

Discussion

13.	From the list of given metals, which is the most ductile metal?
Answer» From the list of given metals, which is the most ductile metal?

Discussion

14.	6. For which element (IP-IP2
Answer» 6. For which element (IP-IP2<11eV) is found 1) Al 2)Mg 3) Ar 4) none of these

Discussion

15.	Isomers of Oct-1,3,5,7-Tetraene
Answer» Isomers of Oct-1,3,5,7-Tetraene

Discussion

16.	The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?
Answer» The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?

Discussion

17.	(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO4 and ZnSO4 until 2.8g of Fe deposited at the cathode of cell X .How long did the current flow? Calculate the mass of Zn deposited at the cathode of cell Y . ( Molar mass :Fe=56g/mol ,Zn=65.3g/mol ,1 F=96500C/mol)(b) In the plot of molar conductivity (Λm) vs square root of concentration (C)1/2 followingcurves are obtained for two electrolytes A and B :
Answer» (a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes $F e S O_{4}$ and $Z n S O_{4}$ until 2.8g of Fe deposited at the cathode of cell X .How long did the current flow? Calculate the mass of Zn deposited at the cathode of cell Y . ( Molar mass :Fe=56g/mol ,Zn=65.3g/mol ,1 F=96500C/mol) (b) In the plot of molar conductivity $(Λ_{m})$ vs square root of concentration $(C)^{1 / 2}$ following curves are obtained for two electrolytes A and B :

Discussion

18.	The increasing order of pKb values of the following compounds is :
Answer» The increasing order of $p K_{b}$ values of the following compounds is :

Discussion

19.	Name the reagent used for Bromination of phenol to 2,4,6-tribromophenol :
Answer» Name the reagent used for Bromination of phenol to 2,4,6-tribromophenol :

Discussion

20.	What is the hybridisation of cental atom in CrO3
Answer» What is the hybridisation of cental atom in CrO3

Discussion

21.	The bonds present in N2O. Explain
Answer» The bonds present in N2O. Explain

Discussion

22.	Beckmann – rearrangement is possible in which of the following?
Answer» Beckmann – rearrangement is possible in which of the following?

Discussion

23.	What are salts
Answer» What are salts

Discussion

24.	The boiling point of water at 735 torr is 99.07^†extdegree C. The mass of NaCI added in 100 g water to make its boiling point 100^†extdegree C is (k_b= 0.51 K kg mol^{-1}) : (a) 10.68 g (b) 5.34 g (c) 2.67 g (d) 26.7 g
Answer» The boiling point of water at 735 torr is 99.07^†extdegree C. The mass of NaCI added in 100 g water to make its boiling point 100^†extdegree C is (k_b= 0.51 K kg mol^{-1}) : (a) 10.68 g (b) 5.34 g (c) 2.67 g (d) 26.7 g

Discussion

25.	2 mole of an ideal gas expanded isothermally and reversibly from 1litre to 10 litres at 300K. Enthalpy change in the process would be
Answer» 2 mole of an ideal gas expanded isothermally and reversibly from 1litre to 10 litres at 300K. Enthalpy change in the process would be

Discussion

26.	N moles of an ideal monatomic gas is heated from35^° C to 55^° C at constant volume and 900 J of heatis absorbed. If same gas is heated at constantpressure from 55^° C to 95 C, then the heat requiredwill be(1) 1000 J(2) 1500 J(4) 3000 J(3) 2000 J
Answer» N moles of an ideal monatomic gas is heated from35^° C to 55^° C at constant volume and 900 J of heatis absorbed. If same gas is heated at constantpressure from 55^° C to 95 C, then the heat requiredwill be(1) 1000 J(2) 1500 J(4) 3000 J(3) 2000 J

Discussion

27.	According to Bohr theory, the electronic energy of the hydrogen atom in the nth Bohr orbit is given by En=−21×10−19n2×Z2 J The longest wavelength of light that will be needed to remove an electron from the 3rd orbit of the He+ ion is x×10−7 m. Find the value of x. (Give your answer upto two decimal only, take h=6×10−34 J sec)
Answer» According to Bohr theory, the electronic energy of the hydrogen atom in the $n^{t h}$ Bohr orbit is given by $E_{n} = - \frac{21 \times 10^{- 19}}{n^{2}} \times Z^{2} J$ The longest wavelength of light that will be needed to remove an electron from the $3^{r d}$ orbit of the $H e^{+}$ ion is $x \times 10^{- 7} m$ . Find the value of $x$ . (Give your answer upto two decimal only, take $h = 6 \times 10^{- 34} J s e c$ )

Discussion

28.	Why AlF3 has higher melting point than NaF? # Why fajan's rule is not followed here?
Answer» Why AlF3 has higher melting point than NaF? # Why fajan's rule is not followed here?

Discussion

29.	The compressibility of a gas is less than unity at STP. Therefore, its molar volume is
Answer» The compressibility of a gas is less than unity at STP. Therefore, its molar volume is

Discussion

30.	The number of C-C sigma bonds in the compound
Answer» The number of C-C sigma bonds in the compound

30.

The number of C-C sigma bonds in the compound

Answer»

The number of C-C sigma bonds in the compound

Discussion

31.	What is the molecular ity of a psuedofirst order reaction
Answer» What is the molecular ity of a psuedofirst order reaction

Discussion

32.	What is the oxidation number of sodium in sodium amalgam?
Answer» What is the oxidation number of sodium in sodium amalgam?

Discussion

33.	43. One litre of water contains 10moles of Hions .Degree of ionisation of water ( inpercentage) is1) 1.8x 10313.6 10-72) 1.8x 1094) 3.6x 10-9
Answer» 43. One litre of water contains 10moles of Hions .Degree of ionisation of water ( inpercentage) is1) 1.8x 10313.6 10-72) 1.8x 1094) 3.6x 10-9

Discussion

34.	4 Chlorophyll is a biomolecule responsible for green 15colour in the plants. Chlorophyll contains 2.68% ofmagnesium by mass. Calculate the number ofmagnesium atoms in 6 g of chlorophyll (Mg- 24)
Answer» 4 Chlorophyll is a biomolecule responsible for green 15colour in the plants. Chlorophyll contains 2.68% ofmagnesium by mass. Calculate the number ofmagnesium atoms in 6 g of chlorophyll (Mg- 24)

Discussion

35.	The unit cell of an ionic compound is a cube in which cations (A) occupy each of the corners and anions (B) are at the centres of each face. The simplest formula of the ionic compound is ?
Answer» The unit cell of an ionic compound is a cube in which cations (A) occupy each of the corners and anions (B) are at the centres of each face. The simplest formula of the ionic compound is ?

Discussion

36.	The number of compounds that give Cannizzaro reaction is:
Answer» The number of compounds that give Cannizzaro reaction is:

Discussion

37.	Calcium carbonate reacts with aqueuaq HCl to give calcium chloride and carbon dioxide according to the reaction . CaCl2 (s) + 2HCl (aq.) = CaCl2 (aq) + CO2 (g) + H2O (l) What mass of calcium carbonate is required to react completely with 25ml of 0.75M HCl?
Answer» Calcium carbonate reacts with aqueuaq HCl to give calcium chloride and carbon dioxide according to the reaction . CaCl2 (s) + 2HCl (aq.) = CaCl2 (aq) + CO2 (g) + H2O (l) What mass of calcium carbonate is required to react completely with 25ml of 0.75M HCl?

37.

Calcium carbonate reacts with aqueuaq HCl to give calcium chloride and carbon dioxide according to the reaction . CaCl2 (s) + 2HCl (aq.) = CaCl2 (aq) + CO2 (g) + H2O (l) What mass of calcium carbonate is required to react completely with 25ml of 0.75M HCl?

Answer»

Calcium carbonate reacts with aqueuaq HCl to give calcium chloride and carbon dioxide according to the reaction .

CaCl2 (s) + 2HCl (aq.) = CaCl2 (aq) + CO2 (g) + H2O (l)

What mass of calcium carbonate is required to react completely with 25ml of 0.75M HCl?

Discussion

38.	H2S, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195m, calculate Henrys law constant.
Answer» H2S, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195m, calculate Henrys law constant.

Discussion

39.	71 Sea water is found to contain 5.85% NaCl and 9.5% MgCl2 by weight of solution. Calculate its normal boiling point assuming 80% ionisation for NaCl and 50% ionisation of MgCl2. Kb for water = 0.51 kg K / mol (i) Tb = 102.3^°C (ii) Tb = 105.3 K (iii) Tb = 110^°C (iv) Tb = 112 K
Answer» 71 Sea water is found to contain 5.85% NaCl and 9.5% MgCl2 by weight of solution. Calculate its normal boiling point assuming 80% ionisation for NaCl and 50% ionisation of MgCl2. Kb for water = 0.51 kg K / mol (i) Tb = 102.3^°C (ii) Tb = 105.3 K (iii) Tb = 110^°C (iv) Tb = 112 K

Discussion

40.	12gm of Mg react with dilute mineral acid to produce how many hydrogen(maximum)?
Answer» 12gm of Mg react with dilute mineral acid to produce how many hydrogen(maximum)?

Discussion

41.	the solubility of CaCO3 is 7*10^-3 mg/litre.calculate the solubility of BaCO3 (in mol/l) from this information and from the fact that when Na2CO3 is added slowly to a solution containing equimolar concentration of Ca^2+ and Ba^2+,no precipitate of CaCO3 is formed until 90% of Ba^+2 has been precipitated as BaCO3 .(assume no hydrolysis of CO3^2- ion.)
Answer» the solubility of CaCO3 is 7*10^-3 mg/litre.calculate the solubility of BaCO3 (in mol/l) from this information and from the fact that when Na2CO3 is added slowly to a solution containing equimolar concentration of Ca^2+ and Ba^2+,no precipitate of CaCO3 is formed until 90% of Ba^+2 has been precipitated as BaCO3 .(assume no hydrolysis of CO3^2- ion.)

Discussion

42.	what is NTP and STP
Answer» what is NTP and STP

Discussion

43.	2 What is structure of atom ?
Answer» 2 What is structure of atom ?

Discussion

44.	The reagent (A) can be :
Answer» The reagent (A) can be :

Discussion

45.	Identify the type of polymer −A−B−B−A−A−A−B−A−
Answer» Identify the type of polymer $- A - B - B - A - A - A - B - A -$

45.

Identify the type of polymer −A−B−B−A−A−A−B−A−

Answer»

Identify the type of polymer

$- A - B - B - A - A - A - B - A -$

Discussion

46.	44 A mixture of 0.3 mole of H(2) and 0.3 mole of I(2) allowed to react in a 10 lit vessel at 500 degree centigrade if K(c) of H(2)+I(2)-->2HI is 64, the amount of unreacted I(2) at equilibrium is?
Answer» 44 A mixture of 0.3 mole of H(2) and 0.3 mole of I(2) allowed to react in a 10 lit vessel at 500 degree centigrade if K(c) of H(2)+I(2)-->2HI is 64, the amount of unreacted I(2) at equilibrium is?

Discussion

47.	E represents an element belonging to carbon family. E+2X2→EX4(X=F,Cl,Br,I)
Answer» E represents an element belonging to carbon family. $E + 2 X_{2} \to E X_{4} (X = F, C l, B r, I)$

Discussion

48.	A patient has a cholesterol level of 206 mg/L. What is the molarity of cholesterol in this patient's blood if the molar mass of cholesterol is 386.64 g/mol?
Answer» A patient has a cholesterol level of $206 mg/L$ . What is the molarity of cholesterol in this patient's blood if the molar mass of cholesterol is $386.64 g/mol$ ?

Discussion

49.	Inthe button cells widely used in watches and other devices thefollowing reaction takes place:Zn(s)+ Ag2O(s)+ H2O(l)→ Zn2+(aq)+ 2Ag(s) + 2OH−(aq)Determineandfor the reaction.
Answer» In the button cells widely used in watches and other devices the following reaction takes place: Zn(s) + Ag₂O(s) + H₂O(l) → Zn²⁺(aq) + 2Ag(s) + 2OH⁻(aq) Determine and for the reaction.

49.

Inthe button cells widely used in watches and other devices thefollowing reaction takes place:Zn(s)+ Ag2O(s)+ H2O(l)→ Zn2+(aq)+ 2Ag(s) + 2OH−(aq)Determineandfor the reaction.

Answer»

In
the button cells widely used in watches and other devices the
following reaction takes place:

Zn(s)
+ Ag₂O(s)
+ H₂O(l)
→ Zn²⁺(aq)
+ 2Ag(s) + 2OH⁻(aq)

Determine

and

for the reaction.

Discussion

50.	aqueous sugar syrup of mass 224 .4g contains 34.4g of sugar. calculate (a) the molality of solution (b) mole fraction of solute
Answer» aqueous sugar syrup of mass 224 .4g contains 34.4g of sugar. calculate (a) the molality of solution (b) mole fraction of solute

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The mole fraction of solute in 1 molal aqueous solution is:

Which of these is not an element? 1. On heating it gives off a gas and leaves residue. 2. It burns in air to form carbon dioxide and water. 3. It changes into solid at 273 K and to gas at 373 K. I don't know about elements so can you please explain the answer?

To neutralise completely 20 ml of 0.1 M of aqueous solution of phosphoric acid the volume of 0.1 M aqueous KOH solution required is ??

The rate constant of a reaction is 1.2×10^-3sec^-1 at 30℃and 2.1×10^-3sec^-1 at 40℃.calculate the energy of activation of the reaction

The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY(0.10 M). If λ∘X=λ∘Y the difference in their pKa values, (pKa (HX)−pKa(HY)) is (consider degree of ionization of both acids to be

40. A 2g sample containing Na2CO3 and NaHCO3 loses 0.248g when heated to 300^° c,the temperature at which NaHCO3 decomposes to Na2CO3,CO2 AND H2O.what is the precentage of Na2CO3 in the given mixture?

What is the relation between the radius of circle 'r' and side of the square 'a' in this figure?If x∗r=a, type x.___

Oxidation state of C in pyrene

How to identify whether a compound will undergo d-d transitions or not? Please explain with examples!

Rate of effusion of an ozonised sample is 0.95 times rate of effusion of pure oxygen . Mass% of ozone in ozonised sample is ?

In which of the following compounds, keto form is more dominating than enol form?

The major products A and B in the following set of reactions are

From the list of given metals, which is the most ductile metal?

6. For which element (IP-IP2

Isomers of Oct-1,3,5,7-Tetraene

The number of atoms in face-centered cubic and hexagonal unit cells respectively are ?

The increasing order of pKb values of the following compounds is :

Name the reagent used for Bromination of phenol to 2,4,6-tribromophenol :

What is the hybridisation of cental atom in CrO3

The bonds present in N2O. Explain

Beckmann – rearrangement is possible in which of the following?

What are salts

The boiling point of water at 735 torr is 99.07^†extdegree C. The mass of NaCI added in 100 g water to make its boiling point 100^†extdegree C is (k_b= 0.51 K kg mol^{-1}) : (a) 10.68 g (b) 5.34 g (c) 2.67 g (d) 26.7 g

2 mole of an ideal gas expanded isothermally and reversibly from 1litre to 10 litres at 300K. Enthalpy change in the process would be

N moles of an ideal monatomic gas is heated from35^° C to 55^° C at constant volume and 900 J of heatis absorbed. If same gas is heated at constantpressure from 55^° C to 95 C, then the heat requiredwill be(1) 1000 J(2) 1500 J(4) 3000 J(3) 2000 J

Why AlF3 has higher melting point than NaF? # Why fajan's rule is not followed here?

The compressibility of a gas is less than unity at STP. Therefore, its molar volume is

The number of C-C sigma bonds in the compound

What is the molecular ity of a psuedofirst order reaction

What is the oxidation number of sodium in sodium amalgam?

43. One litre of water contains 10moles of Hions .Degree of ionisation of water ( inpercentage) is1) 1.8x 10313.6 10-72) 1.8x 1094) 3.6x 10-9

4 Chlorophyll is a biomolecule responsible for green 15colour in the plants. Chlorophyll contains 2.68% ofmagnesium by mass. Calculate the number ofmagnesium atoms in 6 g of chlorophyll (Mg- 24)

The unit cell of an ionic compound is a cube in which cations (A) occupy each of the corners and anions (B) are at the centres of each face. The simplest formula of the ionic compound is ?

The number of compounds that give Cannizzaro reaction is:

Calcium carbonate reacts with aqueuaq HCl to give calcium chloride and carbon dioxide according to the reaction . CaCl2 (s) + 2HCl (aq.) = CaCl2 (aq) + CO2 (g) + H2O (l) What mass of calcium carbonate is required to react completely with 25ml of 0.75M HCl?

H2S, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195m, calculate Henrys law constant.

71 Sea water is found to contain 5.85% NaCl and 9.5% MgCl2 by weight of solution. Calculate its normal boiling point assuming 80% ionisation for NaCl and 50% ionisation of MgCl2. Kb for water = 0.51 kg K / mol (i) Tb = 102.3^°C (ii) Tb = 105.3 K (iii) Tb = 110^°C (iv) Tb = 112 K

12gm of Mg react with dilute mineral acid to produce how many hydrogen(maximum)?

what is NTP and STP

2 What is structure of atom ?

The reagent (A) can be :

Identify the type of polymer −A−B−B−A−A−A−B−A−

44 A mixture of 0.3 mole of H(2) and 0.3 mole of I(2) allowed to react in a 10 lit vessel at 500 degree centigrade if K(c) of H(2)+I(2)-->2HI is 64, the amount of unreacted I(2) at equilibrium is?

E represents an element belonging to carbon family. E+2X2→EX4(X=F,Cl,Br,I)

A patient has a cholesterol level of 206 mg/L. What is the molarity of cholesterol in this patient's blood if the molar mass of cholesterol is 386.64 g/mol?

Inthe button cells widely used in watches and other devices thefollowing reaction takes place:Zn(s)+ Ag2O(s)+ H2O(l)→ Zn2+(aq)+ 2Ag(s) + 2OH−(aq)Determineandfor the reaction.

aqueous sugar syrup of mass 224 .4g contains 34.4g of sugar. calculate (a) the molality of solution (b) mole fraction of solute