46295 + Interview Questions in Chemistry

1.	Balance the equation : KMnO4+H2SO4+FeSO4→K2SO4+MnSO4+Fe2(SO4)3+H2O
Answer» Balance the equation : $K M n O_{4} + H 2 S O_{4} + F e S O 4 \to K 2 S O_{4} + M n S O_{4} + F e_{2} (S O_{4})_{3} + H_{2} O$

Discussion

2.	For a reaction M2O(s)→2M(s)+12O2(g); ΔH=30 kJ mol−1 and ΔS=0.07 kJ K−1 mol−1 at 1 atm. Calculate minimum temperature (in K) at which the reaction would become spontaneous.
Answer» For a reaction $M_{2} O (s) \to 2 M (s) + \frac{1}{2} O_{2} (g); Δ H = 30 k J m o l^{- 1} a n d Δ S = 0.07 k J K^{- 1} m o l^{- 1} a t 1 a t m .$ Calculate minimum temperature (in $K$ ) at which the reaction would become spontaneous.

Discussion

3.	The △H0f CO2(g),CO(g) and H2O are −393.5, −110.5 and−241.8 kJ mol−1 respectively. The standard enthalpy change (in kJ) for the reaction CO2+H2⟶CO+H2O is.
Answer» $T h e △ H_{f}^{0}$ $C O_{2} (g), C O (g) a n d H_{2} O a r e - 393.5, - 110.5 a n d - 241.8 k J m o l^{- 1}$ respectively. The standard enthalpy change (in kJ) for the reaction $C O_{2} + H_{2} ⟶ C O + H_{2} O$ is.

Discussion

4.	A thermally isolated vessel contains 100 g of water at 0∘C. When air above the water is pumped out, some of the water freezes and some evaporates at 0∘C itself. Calculate the mass of the ice formed if no water is left in the vessel. Latent heat of vaporization of water at 0∘C = 2.10 × 105 J kg−1 and latent heat of fusion of ice = 3.36 × 105 J kg−1
Answer» A thermally isolated vessel contains $100 g$ of water at $0^{\circ} C$ . When air above the water is pumped out, some of the water freezes and some evaporates at $0^{\circ} C$ itself. Calculate the mass of the ice formed if no water is left in the vessel. Latent heat of vaporization of water at $0^{\circ} C$ = $2.10 \times 10^{5} J k g^{- 1}$ and latent heat of fusion of ice = $3.36 \times 10^{5} J k g^{- 1}$

Discussion

5.	Silicon forms a compound with chlorine in which 5.6 gm of silicon is combined with 21.3gm of chlorine. Calculate the empirical formula of the compound. (At mass of si -28 cl - 35.5)
Answer» Silicon forms a compound with chlorine in which 5.6 gm of silicon is combined with 21.3gm of chlorine. Calculate the empirical formula of the compound. (At mass of si -28 cl - 35.5)

Discussion

6.	Which of the following represents the correct order of increasing negative electron gain enthalpy for elements O,F and Cl?
Answer» Which of the following represents the correct order of increasing negative electron gain enthalpy for elements $O, F a n d C l$ ?

Discussion

7.	Can you identify the fraction at point B on the number line?
Answer» Can you identify the fraction at point B on the number line?

7.

Can you identify the fraction at point B on the number line?

Answer»

Can you identify the fraction at point B on the number line?

Discussion

8.	A solid solution is made up of two solids 'A' and 'B'. Mass percentage of 'A' is 60% by mass in a solid solution. Find the molar mass of 'B', if the mole fraction of 'A' (xA) is 0.20 and molar mass of 'A' is 100 g/mol.
Answer» A solid solution is made up of two solids 'A' and 'B'. Mass percentage of 'A' is 60% by mass in a solid solution. Find the molar mass of 'B', if the mole fraction of 'A' $(x_{A}) is 0.20$ and molar mass of 'A' is 100 g/mol.

Discussion

9.	For a good quality of cement, the ratio of silica to alumina is
Answer» For a good quality of cement, the ratio of silica to alumina is

Discussion

10.	Identify products Y and Z.
Answer» Identify products Y and Z.

Discussion

11.	Which of the following is/are crystalline form(s) of carbon?
Answer» Which of the following is/are crystalline form(s) of carbon?

Discussion

12.	How many of these are anti-aromatic in nature?
Answer» How many of these are anti-aromatic in nature?

Discussion

13.	Reaction of R-2-bromobutane with aqueous KOH follows two parallel reactions, one by SN2 (complete inversion) and other by SN1 (complete racemization). Specific optical activity for R-2-butanol is −13.50∘/gmL per dm length of the polarimeter. If in a 10 cm tube polarimeter, 10 ml of R-2-bromobutane along with KOH is filled, then after complete reaction of R-2-bromobutane, the mass of all alcohols formed is found equal to 5 g of which 1 g is of R-2-butanol. Then, the total optical rotation (in degree) of the solution is
Answer» Reaction of R-2-bromobutane with aqueous KOH follows two parallel reactions, one by $S_{N} 2$ (complete inversion) and other by $S_{N} 1$ (complete racemization). Specific optical activity for R-2-butanol is $- {13.50}^{\circ} / g m L$ per dm length of the polarimeter. If in a 10 cm tube polarimeter, 10 ml of R-2-bromobutane along with KOH is filled, then after complete reaction of R-2-bromobutane, the mass of all alcohols formed is found equal to 5 g of which 1 g is of R-2-butanol. Then, the total optical rotation (in degree) of the solution is

Discussion

14.	On the basis of theromochemical equations( 1), (2) and (3), find out which of the algebraic relationships given in options (a) to (d) is correct 1. C(graphite)+O2(g)→CO2(g); ΔrH=x kJ mol−12. C(graphite)+12O2(g)→CO(g);Δr H=y kJ mol−13. CO(g)+12O2(g)→CO2(g); ΔrH=z kJ mol−1 (a) z = x + y (b) x =y - z (c) x =y + z (d) y =22 - x
Answer» On the basis of theromochemical equations( 1), (2) and (3), find out which of the algebraic relationships given in options (a) to (d) is correct $1. C (g r a p h i t e) + O_{2} (g) \to C O_{2} (g); Δ_{r} H = x k J m o l^{- 1} 2. C (g r a p h i t e) + \frac{1}{2} O_{2} (g) \to C O (g); Δ_{r} H = y k J m o l^{- 1} 3. C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g); Δ_{r} H = z k J m o l^{- 1}$ (a) z = x + y (b) x =y - z (c) x =y + z (d) y =22 - x

Discussion

15.	Crystal field stabilization energy of high spin d4 octahedral complex is:
Answer» Crystal field stabilization energy of high spin $d^{4}$ octahedral complex is:

Discussion

16.	Orange solution of potassium dichromate turns yellow on adding sodium hydroxide to it. Give reason.
Answer» Orange solution of potassium dichromate turns yellow on adding sodium hydroxide to it. Give reason.

Discussion

17.	There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength
Answer» There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength

17.

There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength

Answer»

There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength

Discussion

18.	In which of the following reactions Kp<Kc?
Answer» In which of the following reactions $K_{p} < K_{c} ?$

Discussion

19.	Consider the following sequence of reactions: Major product [B] of the given reaction would be:
Answer» Consider the following sequence of reactions: Major product [B] of the given reaction would be:

Discussion

20.	What is mean by tautonomy?
Answer» What is mean by tautonomy?

Discussion

21.	Balance the following redox reaction in basic medium: ClO−+CrO−2→Cl−+CrO2−4
Answer» Balance the following redox reaction in basic medium: $C l O^{-} + C r O_{2}^{-} \to C l^{-} + C r O_{4}^{2 -}$

Discussion

22.	If ∆G° for a reaction is 1.93×10^6. Calculate the equilibrium constant if coditions are standard.
Answer» If ∆G° for a reaction is 1.93×10^6. Calculate the equilibrium constant if coditions are standard.

Discussion

23.	The correct order of basic strength of the following compounds is:
Answer» The correct order of basic strength of the following compounds is:

Discussion

24.	An electrolyte [KCET 1984; MP PET/PMT 1988]
Answer» An electrolyte [KCET 1984; MP PET/PMT 1988]

24.

An electrolyte [KCET 1984; MP PET/PMT 1988]

Answer»

An electrolyte

[KCET 1984; MP PET/PMT 1988]

Discussion

25.	The end product of following reaction is :
Answer» The end product of following reaction is :

Discussion

26.	Identify (X) to (Z) in the following sequence of reactions - CaO+C2000∘C−−−−→(X)+(Y) 1100∘C↓+N2 (z)hydrolysis−−−−−−→(P)gas
Answer» Identify (X) to (Z) in the following sequence of reactions - $C a O + C 2000^{\circ} C - --- \to (X) + (Y) 1100^{\circ} C ↓ + N_{2} (z) h y d r o l y s i s - ----- \to (P) gas$

26.

Identify (X) to (Z) in the following sequence of reactions - CaO+C2000∘C−−−−→(X)+(Y) 1100∘C↓+N2 (z)hydrolysis−−−−−−→(P)gas

Answer»

Identify (X) to (Z) in the following sequence of reactions -

$C a O + C 2000^{\circ} C - --- \to (X) + (Y) 1100^{\circ} C ↓ + N_{2} (z) h y d r o l y s i s - ----- \to (P) gas$

Discussion

27.	Two half reactions for the following equation are: 4H2SO4+K2Cr2O7+3Na2SO3⟶Cr2(SO4)3+K2SO4+3Na2SO4+4H2O
Answer» Two half reactions for the following equation are: $4 H_{2} S O_{4} + K_{2} C r_{2} O_{7} + 3 N a_{2} S O_{3} ⟶ C r_{2} (S O_{4})_{3} + K_{2} S O_{4} + 3 N a_{2} S O_{4} + 4 H_{2} O$

Discussion

28.	Out of the following which has smallest bond length
Answer» Out of the following which has smallest bond length

28.

Out of the following which has smallest bond length

Answer»

Out of the following which has smallest bond length

Discussion

29.	If the radiation corresponding to the second line of "Balmer Series" of Li2+ ion, knocks out an electron from the first excited state of an H−atom, then, the kinetic energy of the ejected electron would be:
Answer» If the radiation corresponding to the second line of "Balmer Series" of $L i^{2 +}$ ion, knocks out an electron from the first excited state of an $H - a t o m$ , then, the kinetic energy of the ejected electron would be:

Discussion

30.	An element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. What will be the formula of the compound formed?
Answer» An element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. What will be the formula of the compound formed?

Discussion

31.	Why CH4 has bond angle109 degree and 28minutes and ammonia a bond angle of 107degrees and water a bond angle of 104.5degree
Answer» Why CH4 has bond angle109 degree and 28minutes and ammonia a bond angle of 107degrees and water a bond angle of 104.5degree

Discussion

32.	"The solubility of a gas is directly proportional to the pressure of the gas". The above statement is based upon
Answer» "The solubility of a gas is directly proportional to the pressure of the gas". The above statement is based upon

Discussion

33.	Solid AgNO3 is gradually added to a solution which is 0.01 M in Cl− and 0.01 M in CO2−3. KspAgCl=1.8×10−10 (molL−1)2 and KspAg2CO3=4×10−12 (molL−1)3. The concentration of Cl− when Ag2CO3 starts precipitating is:
Answer» Solid $A g N O_{3}$ is gradually added to a solution which is $0.01 M$ in $C l^{-}$ and $0.01 M$ in $C O_{3}^{2 -}$ . $K_{s p} A g C l = 1.8 \times 10^{- 10} (m o l L^{- 1})^{2}$ and $K_{s p} A g_{2} C O_{3} = 4 \times 10^{- 12} (m o l L^{- 1})^{3}$ . The concentration of $C l^{-}$ when $A g_{2} C O_{3}$ starts precipitating is:

Discussion

34.	How many aldose, ketose, furanose, pyranose and hemiacetal units are present respectively in the following molecule?
Answer» How many aldose, ketose, furanose, pyranose and hemiacetal units are present respectively in the following molecule?

Discussion

35.	The pOH of an aqueous solution is 5. If concentration of H+ in that solution is 10−x M, what is the value of x? ___
Answer» The pOH of an aqueous solution is 5. If concentration of $H^{+}$ in that solution is $10^{- x} M$ , what is the value of x? ___

Discussion

36.	The order of boiling point of NH3, H2O, HF and PH3 is
Answer» The order of boiling point of $N H_{3}, H_{2} O, H F a n d P H_{3}$ is

Discussion

37.	The area of a hole of heat furnace is 10−4m2. It radiates 1.58×105 calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is
Answer» The area of a hole of heat furnace is $10^{- 4} m^{2}$ . It radiates $1.58 \times 10^{5}$ calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is

Discussion

38.	Consider The following reactions: Which of the following is correct comparison of the rate of reaction I and II:
Answer» Consider The following reactions: Which of the following is correct comparison of the rate of reaction I and II:

Discussion

39.	Find the total number of isomeric products formed when n-hexane undergoes monobromination.___
Answer» Find the total number of isomeric products formed when n-hexane undergoes monobromination.___

Discussion

40.	Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin.
Answer» Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin.

40.

Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin.

Answer»

Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin.

Discussion

41.	A cylindrical tube of length 150 cm open at both ends has fundamental frequency f0 in air. Now the tube is dipped vertically in a liquid so that 100 cm is still out of the liquid. Find fundamental frequency of air column (new).
Answer» A cylindrical tube of length 150 cm open at both ends has fundamental frequency $f_{0}$ in air. Now the tube is dipped vertically in a liquid so that 100 cm is still out of the liquid. Find fundamental frequency of air column (new).

Discussion

42.	Select the correct statement about A and B
Answer» Select the correct statement about A and B

Discussion

43.	Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. what is the hybridization state of central atom in the compound Y?
Answer» Sulphur reacts with chlorine in $1 : 2$ ratio and forms X. Hydrolysis of X gives a sulphur compound Y. what is the hybridization state of central atom in the compound Y?

Discussion

44.	Alkyl halides can be converted into Grignard reagents by [KCET 1989]
Answer» Alkyl halides can be converted into Grignard reagents by [KCET 1989]

44.

Alkyl halides can be converted into Grignard reagents by [KCET 1989]

Answer»

Alkyl halides can be converted into Grignard reagents by

[KCET 1989]

Discussion

45.	Which of the following after burning at room temperature gives gaseous oxide
Answer» Which of the following after burning at room temperature gives gaseous oxide

45.

Which of the following after burning at room temperature gives gaseous oxide

Answer»

Which of the following after burning at room temperature gives gaseous oxide

Discussion

46.	The distinguishing test between methanoic acid and ethanoic acid is
Answer» The distinguishing test between methanoic acid and ethanoic acid is

Discussion

47.	Which of the following ion is most effective in coagulation of ferric hydroxide solution?
Answer» Which of the following ion is most effective in coagulation of ferric hydroxide solution?

Discussion

48.	Calculate the pH of a solution of 0.10 M acetic acid after 50.0 mL of 0.10 M acetic acid solution is treated with 25.0 mL of 0.10 M NaOH. (Ka of acetic acid = 1.8×10−5)
Answer» Calculate the pH of a solution of 0.10 M acetic acid after 50.0 mL of 0.10 M acetic acid solution is treated with 25.0 mL of 0.10 M NaOH. ( $K_{a}$ of acetic acid = $1.8 \times 10^{- 5}$ )

Discussion

49.	What is elevation of boiling point . how the molecular weight and non volatile substance is determined by the elevation of boiling ponit
Answer» What is elevation of boiling point . how the molecular weight and non volatile substance is determined by the elevation of boiling ponit

Discussion

50.	For the reaction, 2Cl(g)→Cl2(g), what are the signs of Δ H and Δ S ?
Answer» For the reaction, $2 C l_{(g)} \to C l_{2 (g)}$ , what are the signs of $Δ H$ and $Δ S$ ?

50.

For the reaction, 2Cl(g)→Cl2(g), what are the signs of Δ H and Δ S ?

Answer»

For the reaction,
$2 C l_{(g)} \to C l_{2 (g)}$ , what are the signs of $Δ H$ and $Δ S$ ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Balance the equation : KMnO4+H2SO4+FeSO4→K2SO4+MnSO4+Fe2(SO4)3+H2O

For a reaction M2O(s)→2M(s)+12O2(g); ΔH=30 kJ mol−1 and ΔS=0.07 kJ K−1 mol−1 at 1 atm. Calculate minimum temperature (in K) at which the reaction would become spontaneous.

The △H0f CO2(g),CO(g) and H2O are −393.5, −110.5 and−241.8 kJ mol−1 respectively. The standard enthalpy change (in kJ) for the reaction CO2+H2⟶CO+H2O is.

Silicon forms a compound with chlorine in which 5.6 gm of silicon is combined with 21.3gm of chlorine. Calculate the empirical formula of the compound. (At mass of si -28 cl - 35.5)

Which of the following represents the correct order of increasing negative electron gain enthalpy for elements O,F and Cl?

Can you identify the fraction at point B on the number line?

A solid solution is made up of two solids 'A' and 'B'. Mass percentage of 'A' is 60% by mass in a solid solution. Find the molar mass of 'B', if the mole fraction of 'A' (xA) is 0.20 and molar mass of 'A' is 100 g/mol.

For a good quality of cement, the ratio of silica to alumina is

Identify products Y and Z.

Which of the following is/are crystalline form(s) of carbon?

How many of these are anti-aromatic in nature?

Crystal field stabilization energy of high spin d4 octahedral complex is:

Orange solution of potassium dichromate turns yellow on adding sodium hydroxide to it. Give reason.

There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength

In which of the following reactions Kp&lt;Kc?

Consider the following sequence of reactions: Major product [B] of the given reaction would be:

What is mean by tautonomy?

Balance the following redox reaction in basic medium: ClO−+CrO−2→Cl−+CrO2−4

If ∆G° for a reaction is 1.93×10^6. Calculate the equilibrium constant if coditions are standard.

The correct order of basic strength of the following compounds is:

An electrolyte [KCET 1984; MP PET/PMT 1988]

The end product of following reaction is :

Identify (X) to (Z) in the following sequence of reactions - CaO+C2000∘C−−−−→(X)+(Y) 1100∘C↓+N2 (z)hydrolysis−−−−−−→(P)gas

Two half reactions for the following equation are: 4H2SO4+K2Cr2O7+3Na2SO3⟶Cr2(SO4)3+K2SO4+3Na2SO4+4H2O

Out of the following which has smallest bond length

If the radiation corresponding to the second line of "Balmer Series" of Li2+ ion, knocks out an electron from the first excited state of an H−atom, then, the kinetic energy of the ejected electron would be:

An element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. What will be the formula of the compound formed?

Why CH4 has bond angle109 degree and 28minutes and ammonia a bond angle of 107degrees and water a bond angle of 104.5degree

"The solubility of a gas is directly proportional to the pressure of the gas". The above statement is based upon

Solid AgNO3 is gradually added to a solution which is 0.01 M in Cl− and 0.01 M in CO2−3. KspAgCl=1.8×10−10 (molL−1)2 and KspAg2CO3=4×10−12 (molL−1)3. The concentration of Cl− when Ag2CO3 starts precipitating is:

How many aldose, ketose, furanose, pyranose and hemiacetal units are present respectively in the following molecule?

The pOH of an aqueous solution is 5. If concentration of H+ in that solution is 10−x M, what is the value of x? ___

The order of boiling point of NH3, H2O, HF and PH3 is

The area of a hole of heat furnace is 10−4m2. It radiates 1.58×105 calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is

Consider The following reactions: Which of the following is correct comparison of the rate of reaction I and II:

Find the total number of isomeric products formed when n-hexane undergoes monobromination.___

Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin.

A cylindrical tube of length 150 cm open at both ends has fundamental frequency f0 in air. Now the tube is dipped vertically in a liquid so that 100 cm is still out of the liquid. Find fundamental frequency of air column (new).

Select the correct statement about A and B

Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. what is the hybridization state of central atom in the compound Y?

Alkyl halides can be converted into Grignard reagents by [KCET 1989]

Which of the following after burning at room temperature gives gaseous oxide

The distinguishing test between methanoic acid and ethanoic acid is

Which of the following ion is most effective in coagulation of ferric hydroxide solution?

Calculate the pH of a solution of 0.10 M acetic acid after 50.0 mL of 0.10 M acetic acid solution is treated with 25.0 mL of 0.10 M NaOH. (Ka of acetic acid = 1.8×10−5)

What is elevation of boiling point . how the molecular weight and non volatile substance is determined by the elevation of boiling ponit

For the reaction, 2Cl(g)→Cl2(g), what are the signs of Δ H and Δ S ?

In which of the following reactions Kp<Kc?