46295 + Interview Questions in Chemistry

1.	If the boiling point of an aqueous solution containing a non-volatile solute is 100.15∘C. What is its freezing point? Given latent heat of fusion and vapourization of water 80calg−1 and 540calg−1, respectively.
Answer» If the boiling point of an aqueous solution containing a non-volatile solute is ${100.15}^{\circ} C$ . What is its freezing point? Given latent heat of fusion and vapourization of water $80 c a l g^{- 1}$ and $540 c a l g^{- 1}$ , respectively.

Discussion

2.	A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resists a change in pH yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?
Answer» A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resists a change in pH yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?

Discussion

3.	The most suitable method of the separation of a 1 : 1 mixture of ortho and para nitrophenols is [CBSE PMT 1994, 99; CPMT 1997]
Answer» The most suitable method of the separation of a 1 : 1 mixture of ortho and para nitrophenols is [CBSE PMT 1994, 99; CPMT 1997]

Discussion

4.	The alcohol which is highly soluble in water is:
Answer» The alcohol which is highly soluble in water is:

Discussion

5.	If an element A shows two oxidation states +2 and +3. A forms oxides in such a way that they have a ratio 1 : 3 in a compound, the formula of the compound will be
Answer» If an element A shows two oxidation states $+ 2$ and $+ 3$ . A forms oxides in such a way that they have a ratio 1 : 3 in a compound, the formula of the compound will be

Discussion

6.	The potential of the cell at 25∘C is Pt\|H2(1 atm)\|CH3COONa(0.1M)+CH3COOH(0.01M)\|\|NH4Cl(0.2M)+NH4OH(0.1M)\|H2(1 atm)\|Pt Given: pKa of CH3COOH and pKb of NH4OH=4.74
Answer» The potential of the cell at $25^{\circ} C$ is $P t \| H_{2} (1 atm) \| C H_{3} C O O N a (0.1 M) + C H_{3} C O O H (0.01 M) \| \| N H_{4} C l (0.2 M) + N H_{4} O H (0.1 M) \| H_{2} (1 atm) \| P t$ Given: $p K_{a}$ of $C H_{3} C O O H$ and $p K_{b}$ of $N H_{4} O H = 4.74$

Discussion

7.	A mineral consists of a cubic close-packed structure formed by O2– ions where half the octahedral voids are occupied by Al3+ and one eighth of the tetrahedral voids are occupied by Mn2+. The chemical formula of the mineral is:
Answer» A mineral consists of a cubic close-packed structure formed by $O^{2 -}$ ions where half the octahedral voids are occupied by $A l^{3 +}$ and one eighth of the tetrahedral voids are occupied by $M n^{2 +}$ . The chemical formula of the mineral is:

Discussion

8.	Select the complexes that are paramagnetic in nature.
Answer» Select the complexes that are paramagnetic in nature.

Discussion

9.	Write the appropriate equilibrium constant expression Kc for the following reaction: 2CO(g)+O2(g)⇌2CO2(g)
Answer» Write the appropriate equilibrium constant expression $K_{c}$ for the following reaction: $2 C O (g) + O_{2} (g) ⇌ 2 C O_{2} (g)$

Discussion

10.	The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is: M(s)\|M+ (aq;0.05 molar)\|\|M+ (aq;1 molar)\|M(s) For the above electrolytic cell the magnitude of the cell potential \|Ecell\|=70 mV. For the above cell
Answer» The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is: $M (s) \| M^{+}$ (aq;0.05 molar)\|\| $M^{+}$ (aq;1 molar)\|M(s) For the above electrolytic cell the magnitude of the cell potential $\| E_{c e l l} \| = 70 m V$ . For the above cell

10.

The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is: M(s)|M+ (aq;0.05 molar)||M+ (aq;1 molar)|M(s) For the above electrolytic cell the magnitude of the cell potential |Ecell|=70 mV. For the above cell

Answer»

The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is:
$M (s) | M^{+}$ (aq;0.05 molar)|| $M^{+}$ (aq;1 molar)|M(s)
For the above electrolytic cell the magnitude of the cell potential $| E_{c e l l} | = 70 m V$ .

For the above cell

Discussion

11.	In alkane the bond angle is
Answer» In alkane the bond angle is

Discussion

12.	The concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolyzed. Which of the following are produced?
Answer» The concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolyzed. Which of the following are produced?

Discussion

13.	Explain the following terms with suitable examples (i) Scottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F - centres
Answer» Explain the following terms with suitable examples (i) Scottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F - centres

13.

Explain the following terms with suitable examples (i) Scottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F - centres

Answer»

Explain the following terms with suitable examples

(i) Scottky defect

(ii) Frenkel defect

(iii) Interstitials and

(iv) F - centres

Discussion

14.	Which of the following has the minimum ionic character?
Answer» Which of the following has the minimum ionic character?

Discussion

15.	Metal element 'M' of radius 50nm is crystallized in FCC format and made into cubical crystals such that face of unit cells are aligned with face of cubical crystal.If total number of metal atoms of 'M' at face of cubical crystal is 6 × 1030, then area of one face of cubical crystal is A × 1016 m2, the value of 'A' is: __
Answer» Metal element 'M' of radius 50nm is crystallized in FCC format and made into cubical crystals such that face of unit cells are aligned with face of cubical crystal.If total number of metal atoms of 'M' at face of cubical crystal is 6 $\times$ $10^{30}$ , then area of one face of cubical crystal is A $\times$ $10^{16}$ $m^{2}$ , the value of 'A' is: __

Discussion

16.	Which type of polymer is represented by the following segment?
Answer» Which type of polymer is represented by the following segment?

Discussion

17.	Which of the following is not an example of cross-conjugation?
Answer» Which of the following is not an example of cross-conjugation?

Discussion

18.	What is the effect of temperature on the rate constant of a reaction? How can this temperature effect on rate constant be represented quantitatively?
Answer» What is the effect of temperature on the rate constant of a reaction? How can this temperature effect on rate constant be represented quantitatively?

Discussion

19.	10 mL of 2 M acid is added to 250 mL of a buffer solution with pH=6.34 and the pH of the solution becomes 6.32. The buffer capacity of the solution is:
Answer» $10 mL$ of $2 M$ acid is added to $250 mL$ of a buffer solution with $p H = 6.34$ and the $p H$ of the solution becomes $6.32$ . The buffer capacity of the solution is:

Discussion

20.	A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 L to 375 mL at a constant temperature of 37.0∘C. As it does so, it absorbs 208 J of heat energy. The values of q and W for the process will be (R = 8.314 J/mol K, ln 7.5 = 2.01)
Answer» A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 L to 375 mL at a constant temperature of ${37.0}^{\circ} C$ . As it does so, it absorbs 208 J of heat energy. The values of q and W for the process will be (R = 8.314 J/mol K, ln 7.5 = 2.01)

Discussion

21.	A 2.18 g sample contains a mixture of XO and X2O3. It reacts with 0.015 moles of K2Cr2O7 to oxidize the sample completely to form XO−4 and Cr3+. If 0.0187 moles of XO−4 are formed, what is the atomic mass of X?
Answer» A $2.18 g$ sample contains a mixture of $X O$ and $X_{2} O_{3} .$ It reacts with 0.015 moles of $K_{2} C r_{2} O_{7}$ to oxidize the sample completely to form $X O_{4}^{-}$ and $C r^{3 +}$ . If 0.0187 moles of $X O_{4}^{-}$ are formed, what is the atomic mass of X?

Discussion

22.	The decreasing order of rate of reaction with HBr for the following compounds is :
Answer» The decreasing order of rate of reaction with $H B r$ for the following compounds is :

Discussion

23.	Number of lone pair-bond pair repulsion at 90∘ are (P) in I−3
Answer» Number of lone pair-bond pair repulsion at $90^{\circ}$ are (P) in $I_{3}^{-}$

Discussion

24.	What happens in the following reaction?
Answer» What happens in the following reaction?

Discussion

25.	Which is true for an element present in group 13 of the periodic table ?
Answer» Which is true for an element present in group 13 of the periodic table ?

Discussion

26.	Why is neon maintained at low pressure in neon lights.What if the pressure is increased.
Answer» Why is neon maintained at low pressure in neon lights.What if the pressure is increased.

Discussion

27.	Silicon doped with electron-rich impurity forms ................. (a) P-type semiconductor (b) n-type semiconductor (c) intrinsic semiconductor (d) insulator
Answer» Silicon doped with electron-rich impurity forms ................. (a) P-type semiconductor (b) n-type semiconductor (c) intrinsic semiconductor (d) insulator

27.

Silicon doped with electron-rich impurity forms ................. (a) P-type semiconductor (b) n-type semiconductor (c) intrinsic semiconductor (d) insulator

Answer»

Silicon doped with electron-rich impurity forms .................

(a) P-type semiconductor (b) n-type semiconductor

(c) intrinsic semiconductor (d) insulator

Discussion

28.	nitrating mixture is obtained by mixing concentrated HNO3 and concentrated H2SO4. The role of the latter - H2SO4 is:
Answer» nitrating mixture is obtained by mixing concentrated $H N O_{3}$ and concentrated $H_{2} S O_{4}$ . The role of the latter - $H_{2} S O_{4}$ is:

Discussion

29.	To 50 L of 0.2 N NaOH, 2.5 L of 2 N HCl and 15 L of 0.1 N FeCl3 solutions are added. What weight of Fe2O3 can be obtained from the precipitate? Also report the normality of NaOH left in the resultant solution.
Answer» To $50 L$ of $0.2 N N a O H, 2.5 L$ of $2 N H C l$ and $15 L$ of $0.1 N F e C l_{3}$ solutions are added. What weight of $F e_{2} O_{3}$ can be obtained from the precipitate? Also report the normality of NaOH left in the resultant solution.

Discussion

30.	Calculate the mass of K2Cr2O7 in grams required to produce 254 g I2 from KI solution. K2Cr2O7+KI→Cr3++I2 (Molar mass of K2Cr2O7 is 294 g mol−1)
Answer» Calculate the mass of $K_{2} C r_{2} O_{7}$ in grams required to produce $254 g I_{2}$ from $K I$ solution. $K_{2} C r_{2} O_{7} + K I \to C r^{3 +} + I_{2}$ (Molar mass of $K_{2} C r_{2} O_{7}$ is $294 g m o l^{- 1}$ )

Discussion

31.	A solution contains Na2CO3 and NaHCO3. 10 mL of this solution required 2.5 mL of 0.1 MH2SO4 for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 respectively, in 1 litre of solution is:
Answer» A solution contains $N a_{2} C O_{3}$ and $N a H C O_{3}$ . $10 mL$ of this solution required $2.5 mL$ of $0.1 M H_{2} S O_{4}$ for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further $2.5 mL$ of $0.2 M H_{2} S O_{4}$ was required. The amount of $N a_{2} C O_{3}$ and $N a H C O_{3}$ respectively, in 1 litre of solution is:

Discussion

32.	In acidic medium, H2O2 acts as a reducing agent in its reaction with:
Answer» In acidic medium, $H_{2} O_{2}$ acts as a reducing agent in its reaction with:

Discussion

33.	How does hydrogen resemble the group 17 elements of the periodic table?
Answer» How does hydrogen resemble the group 17 elements of the periodic table?

Discussion

34.	If the temperature of 1 mole of an ideal gas is increased by 50∘ C, calculate the change in the kinetic energy of the system.
Answer» If the temperature of 1 mole of an ideal gas is increased by $50^{\circ} C$ , calculate the change in the kinetic energy of the system.

Discussion

35.	What is the number of octahedral voids in the BCC Unit cell?
Answer» What is the number of octahedral voids in the BCC Unit cell?

Discussion

36.	List the uses of neon and argon gases.
Answer» List the uses of neon and argon gases.

Discussion

37.	ΔS for the reaction, MgCO3(s)→MgO(s)+CO2(g) will be:
Answer» $Δ S$ for the reaction, $M g C O_{3} (s) \to M g O (s) + C O_{2} (g)$ will be:

Discussion

38.	The ΔfG∘T line for 2C +O2 → 2CO has a __ slope
Answer» The $\frac{Δ_{f} G^{\circ}}{T}$ line for $2 C$ $+ O_{2}$ $\to$ $2 C O$ has a __ slope

Discussion

39.	What will be the oxidation number of "O" in O2F2 and OF2 respectively ?
Answer» What will be the oxidation number of " $O$ " in $O_{2} F_{2}$ and $O F_{2}$ respectively ?

Discussion

40.	If equal volumes of 0.1 M KMnO4 and 0.1MK2Cr2O7 solutions are allowed to oxidise Fe2+ to Fe3+ in acidic medium, then Fe2+ oxidized will be:
Answer» If equal volumes of 0.1 M $K M n O_{4}$ and $0.1 M K_{2} C r_{2} O_{7}$ solutions are allowed to oxidise $F e^{2 +}$ to $F e^{3 +}$ in acidic medium, then $F e^{2 +}$ oxidized will be:

Discussion

41.	The emf of the cell reaction, Zn(s)+Cu2+(aq.)→Zn2+(aq.)+Cu(s) is 1.1V. If enthalpy of the reaction is −216.7kJmol−1, calculate the entropy change for the reaction(in J/Kmole)
Answer» The emf of the cell reaction, $Z n (s) + {C u}^{2 +} (a q .) \to {Z n}^{2 +} (a q .) + C u (s)$ is $1.1 V$ . If enthalpy of the reaction is $- 216.7 k J {m o l}^{- 1}$ , calculate the entropy change for the reaction(in J/Kmole)

Discussion

42.	LiCl is hydrated while NaCl is not. Why?
Answer» LiCl is hydrated while NaCl is not. Why?

Discussion

43.	What is a dative bond? How is it formed in ch3no2?
Answer» What is a dative bond? How is it formed in ch3no2?

Discussion

44.	Balance the equation : MnO4−+C2O42−+H+→CO2+Mn+2+H2O
Answer» Balance the equation : $M n O_{4} - + C_{2} O_{42^{-}} + H + \to C O_{2} + M n + 2 + H_{2} O$

Discussion

45.	On adding AgNO3 solution into KI solution, a negatively charged colloidal sol is obtained when they are in :
Answer» On adding $A g N O_{3}$ solution into KI solution, a negatively charged colloidal sol is obtained when they are in :

Discussion

46.	Which of the follwing options has the incorrect combination considering reaction in List-I with major product in List-II.
Answer» Which of the follwing options has the incorrect combination considering reaction in List-I with major product in List-II.

Discussion

47.	The number of radial nodes and angular nodes for d-orbital can be represented as:
Answer» The number of radial nodes and angular nodes for d-orbital can be represented as:

Discussion

48.	Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes _________ reductionself
Answer» Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes _________ reduction self

48.

Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes _________ reductionself

Answer»

Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes _________ reduction

self

Discussion

49.	Which is better oxidising agent out of KMnO4 and K2Cr2O7 ?
Answer» Which is better oxidising agent out of KMnO₄ and K₂Cr₂O₇ ?

Discussion

50.	1,2-Dibromopropane on treatment with X moles of NaNH2 followed by treatment with C2H5Br gives a pentyne. The value of X is:
Answer» 1,2-Dibromopropane on treatment with X moles of $N a N H_{2}$ followed by treatment with $C_{2} H_{5} B r$ gives a pentyne. The value of X is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the boiling point of an aqueous solution containing a non-volatile solute is 100.15∘C. What is its freezing point? Given latent heat of fusion and vapourization of water 80calg−1 and 540calg−1, respectively.

A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resists a change in pH yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?

The most suitable method of the separation of a 1 : 1 mixture of ortho and para nitrophenols is [CBSE PMT 1994, 99; CPMT 1997]

The alcohol which is highly soluble in water is:

If an element A shows two oxidation states +2 and +3. A forms oxides in such a way that they have a ratio 1 : 3 in a compound, the formula of the compound will be

The potential of the cell at 25∘C is Pt|H2(1 atm)|CH3COONa(0.1M)+CH3COOH(0.01M)||NH4Cl(0.2M)+NH4OH(0.1M)|H2(1 atm)|Pt Given: pKa of CH3COOH and pKb of NH4OH=4.74

A mineral consists of a cubic close-packed structure formed by O2– ions where half the octahedral voids are occupied by Al3+ and one eighth of the tetrahedral voids are occupied by Mn2+. The chemical formula of the mineral is:

Select the complexes that are paramagnetic in nature.

Write the appropriate equilibrium constant expression Kc for the following reaction: 2CO(g)+O2(g)⇌2CO2(g)

In alkane the bond angle is

The concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolyzed. Which of the following are produced?

Explain the following terms with suitable examples (i) Scottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F - centres

Which of the following has the minimum ionic character?

Which type of polymer is represented by the following segment?

Which of the following is not an example of cross-conjugation?

What is the effect of temperature on the rate constant of a reaction? How can this temperature effect on rate constant be represented quantitatively?

10 mL of 2 M acid is added to 250 mL of a buffer solution with pH=6.34 and the pH of the solution becomes 6.32. The buffer capacity of the solution is:

A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 L to 375 mL at a constant temperature of 37.0∘C. As it does so, it absorbs 208 J of heat energy. The values of q and W for the process will be (R = 8.314 J/mol K, ln 7.5 = 2.01)

A 2.18 g sample contains a mixture of XO and X2O3. It reacts with 0.015 moles of K2Cr2O7 to oxidize the sample completely to form XO−4 and Cr3+. If 0.0187 moles of XO−4 are formed, what is the atomic mass of X?

The decreasing order of rate of reaction with HBr for the following compounds is :

Number of lone pair-bond pair repulsion at 90∘ are (P) in I−3

What happens in the following reaction?

Which is true for an element present in group 13 of the periodic table ?

Why is neon maintained at low pressure in neon lights.What if the pressure is increased.

Silicon doped with electron-rich impurity forms ................. (a) P-type semiconductor (b) n-type semiconductor (c) intrinsic semiconductor (d) insulator

nitrating mixture is obtained by mixing concentrated HNO3 and concentrated H2SO4. The role of the latter - H2SO4 is:

To 50 L of 0.2 N NaOH, 2.5 L of 2 N HCl and 15 L of 0.1 N FeCl3 solutions are added. What weight of Fe2O3 can be obtained from the precipitate? Also report the normality of NaOH left in the resultant solution.

Calculate the mass of K2Cr2O7 in grams required to produce 254 g I2 from KI solution. K2Cr2O7+KI→Cr3++I2 (Molar mass of K2Cr2O7 is 294 g mol−1)

In acidic medium, H2O2 acts as a reducing agent in its reaction with:

How does hydrogen resemble the group 17 elements of the periodic table?

If the temperature of 1 mole of an ideal gas is increased by 50∘ C, calculate the change in the kinetic energy of the system.

What is the number of octahedral voids in the BCC Unit cell?

List the uses of neon and argon gases.

ΔS for the reaction, MgCO3(s)→MgO(s)+CO2(g) will be:

The ΔfG∘T line for 2C +O2 → 2CO has a __ slope

What will be the oxidation number of "O" in O2F2 and ​ OF2 respectively ?

If equal volumes of 0.1 M KMnO4 and 0.1MK2Cr2O7 solutions are allowed to oxidise Fe2+ to Fe3+ in acidic medium, then Fe2+ oxidized will be:

The emf of the cell reaction, Zn(s)+Cu2+(aq.)→Zn2+(aq.)+Cu(s) is 1.1V. If enthalpy of the reaction is −216.7kJmol−1, calculate the entropy change for the reaction(in J/Kmole)

LiCl is hydrated while NaCl is not. Why?

What is a dative bond? How is it formed in ch3no2?

Balance the equation : MnO4−+C2O42−+H+→CO2+Mn+2+H2O

On adding AgNO3 solution into KI solution, a negatively charged colloidal sol is obtained when they are in :

Which of the follwing options has the incorrect combination considering reaction in List-I with major product in List-II.

The number of radial nodes and angular nodes for d-orbital can be represented as:

Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes _________ reductionself

Which is better oxidising agent out of KMnO4 and K2Cr2O7 ?

1,2-Dibromopropane on treatment with X moles of NaNH2 followed by treatment with C2H5Br gives a pentyne. The value of X is:

What will be the oxidation number of "O" in O2F2 and OF2 respectively ?