46295 + Interview Questions in Chemistry

1.	In the complex [CoCl2(en)2]Br, the co-ordination number and oxidation state of cobalt are:
Answer» In the complex $[C o C l_{2} (e n)_{2}] B r$ , the co-ordination number and oxidation state of cobalt are:

Discussion

2.	20 ml of HCl solution requires 19.85 ml of 0.01 M NaOH solution for complete neutralization. The molarity of HCl solution is
Answer» 20 ml of HCl solution requires 19.85 ml of 0.01 M NaOH solution for complete neutralization. The molarity of HCl solution is

Discussion

3.	For the two gaseous reactions, following data is given : A→B;k1=1010e−20000/T C→D;k2=1012e−24606/T the temperature at which k1 becomes equal to k2 is:
Answer» For the two gaseous reactions, following data is given : $A \to B; k_{1} = 10^{10} e^{- 20000 / T}$ $C \to D; k_{2} = 10^{12} e^{- 24606 / T}$ the temperature at which $k_{1}$ becomes equal to $k_{2}$ is:

Discussion

4.	The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is:
Answer» The decreasing order of reactivity towards dehydrohalogenation $(E_{1})$ reaction of the following compounds is:

Discussion

5.	The reaction of hydrogen and iodine monochloride is given as: H2(g)+2ICl(g)→2HCl(g)+I2(g) This reaction is of first order with respect to H2(g) and ICl(g), following mechanisms were proposed : Mechanism A : H2(g)+2ICl(g)→2HCl(g)+I2(g) Mechanism B : H2(g)+ICl(g)→HCl(g)+HI(g), slow HI(g)+ICl(g)→HCl(g)+I2(g), fast Which of the above mechanism(s) can be consistent with the given information about the reaction?
Answer» The reaction of hydrogen and iodine monochloride is given as: $H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$ This reaction is of first order with respect to $H_{2} (g)$ and $I C l (g)$ , following mechanisms were proposed : Mechanism A : $H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$ Mechanism B : $H_{2} (g) + I C l (g) \to H C l (g) + H I (g), s l o w$ $H I (g) + I C l (g) \to H C l (g) + I_{2} (g), f a s t$ Which of the above mechanism(s) can be consistent with the given information about the reaction?

5.

The reaction of hydrogen and iodine monochloride is given as: H2(g)+2ICl(g)→2HCl(g)+I2(g) This reaction is of first order with respect to H2(g) and ICl(g), following mechanisms were proposed : Mechanism A : H2(g)+2ICl(g)→2HCl(g)+I2(g) Mechanism B : H2(g)+ICl(g)→HCl(g)+HI(g), slow HI(g)+ICl(g)→HCl(g)+I2(g), fast Which of the above mechanism(s) can be consistent with the given information about the reaction?

Answer»

The reaction of hydrogen and iodine monochloride is given as:
$H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$

This reaction is of first order with respect to $H_{2} (g)$ and $I C l (g)$ , following mechanisms were proposed :
Mechanism A : $H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$

Mechanism B : $H_{2} (g) + I C l (g) \to H C l (g) + H I (g), s l o w$

$H I (g) + I C l (g) \to H C l (g) + I_{2} (g), f a s t$
Which of the above mechanism(s) can be consistent with the given information about the reaction?

Discussion

6.	In fibrous proteins, polypeptide chains are held together by ........... . (a) van der Waals forces (b) disulphide linkage (c) electrostatic forces of attraction (d) hydrogen bonds
Answer» In fibrous proteins, polypeptide chains are held together by ........... . (a) van der Waals forces (b) disulphide linkage (c) electrostatic forces of attraction (d) hydrogen bonds

Discussion

7.	Match the items of Column I with the items of Column II and assign the correct code. Column IColumn IIA. Coloured bands1. Zone refiningB. Impure metal to volatile complex2. Fractional distillationC. Purification of Ge and Si3. Mond′s processD. Purification of mercury4. Chromatography5. Liquation Codes A B C D A B C D (a) 1 2 4 5 (b) 4 3 1 2 (c) 3 4 2 1 (d) 5 4 3 2
Answer» Match the items of Column I with the items of Column II and assign the correct code. $\begin{matrix} C o l u m n I & C o l u m n I I A . C o l o u r e d b a n d s & 1. Z o n e r e f i n i n g B . I m p u r e m e t a l t o v o l a t i l e c o m p l e x & 2. F r a c t i o n a l d i s t i l l a t i o n C . P u r i f i c a t i o n o f G e a n d S i & 3. M o n d^{'} s p r o c e s s D . P u r i f i c a t i o n o f m e r c u r y & 4. C h r o m a t o g r a p h y 5. L i q u a t i o n \end{matrix}$ Codes A B C D A B C D (a) 1 2 4 5 (b) 4 3 1 2 (c) 3 4 2 1 (d) 5 4 3 2

Discussion

8.	The decomposition of NH3 on platinum surface is zero order reaction. What are the rates of production of N_2 and H_2 if k=2.5×10−4 mol−1 Ls−1 ?
Answer» The decomposition of $N H_{3}$ on platinum surface is zero order reaction. What are the rates of production of N_2 and H_2 if $k = 2.5 \times 10^{- 4} m o l^{- 1} L s^{- 1}$ ?

Discussion

9.	Sulphur when burnt in air forms:
Answer» Sulphur when burnt in air forms:

Discussion

10.	What is the ratio of the volumes occupied by 2 moles of O2 and 2 moles of O3 at standard temperature and pressure ?
Answer» What is the ratio of the volumes occupied by 2 moles of $O_{2}$ and 2 moles of $O_{3}$ at standard temperature and pressure ?

Discussion

11.	Identify the pair of compounds which cannot exist together in solution.
Answer» Identify the pair of compounds which cannot exist together in solution.

Discussion

12.	What is the major drawback of Fruendlich isotherm?
Answer» What is the major drawback of Fruendlich isotherm?

Discussion

13.	Electra has trouble finding the correct Nernst equation for the cell Zn(s)\|Zn2+\|\|Cu2+\|Cu(s) at 25∘C Can you help her?
Answer» Electra has trouble finding the correct Nernst equation for the cell $Z n (s) \| Z n^{2 +} \| \| C u^{2 +} \| C u (s) a t 25^{\circ} C$ Can you help her?

Discussion

14.	Tollen’s reagent is used for the detection of aldehyde, when a solution of AgNO3 is added to glucose with NH4OH then gluconic acid is formed. Ag++e−→Ag; E∘red=0.8V C6H12O6+H2O→C6H12O7 (Gluconic acid) +2H++2e;E∘oxd=−0.05V [Ag(NH3)2]++e−→Ag(S)+2NH3;E∘red=–0.337V [Use 2.303×RTF=0.0592 and FRT=38.92 at 298 K] (ii) When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much?
Answer» Tollen’s reagent is used for the detection of aldehyde, when a solution of $A g N O_{3}$ is added to glucose with $N H_{4} O H$ then gluconic acid is formed. $A g^{+} + e^{-} \to A g;$ $E_{r e d}^{\circ} = 0.8 V$ $C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7}$ (Gluconic acid) $+ 2 H^{+} + 2 e; E_{o x d}^{\circ} = - 0.05 V$ $[A g (N H_{3})_{2}]^{+} + e^{-} \to A g (S) + 2 N H_{3}; E_{r e d}^{\circ} = - 0.337 V$ [Use $2.303 \times \frac{R T}{F} = 0.0592$ and $\frac{F}{R T} = 38.92$ at 298 K] (ii) When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much?

14.

Tollen’s reagent is used for the detection of aldehyde, when a solution of AgNO3 is added to glucose with NH4OH then gluconic acid is formed. Ag++e−→Ag; E∘red=0.8V C6H12O6+H2O→C6H12O7 (Gluconic acid) +2H++2e;E∘oxd=−0.05V [Ag(NH3)2]++e−→Ag(S)+2NH3;E∘red=–0.337V [Use 2.303×RTF=0.0592 and FRT=38.92 at 298 K] (ii) When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much?

Answer»

Tollen’s reagent is used for the detection of aldehyde, when a solution of $A g N O_{3}$ is added to glucose with $N H_{4} O H$ then gluconic acid is formed.

$A g^{+} + e^{-} \to A g;$ $E_{r e d}^{\circ} = 0.8 V$

$C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7}$ (Gluconic acid) $+ 2 H^{+} + 2 e; E_{o x d}^{\circ} = - 0.05 V$

$[A g (N H_{3})_{2}]^{+} + e^{-} \to A g (S) + 2 N H_{3}; E_{r e d}^{\circ} = - 0.337 V$

[Use $2.303 \times \frac{R T}{F} = 0.0592$ and $\frac{F}{R T} = 38.92$ at 298 K]

(ii) When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much?

Discussion

15.	Among the following, the reaction that proceeds through an electrophilic substitution is:
Answer» Among the following, the reaction that proceeds through an electrophilic substitution is:

Discussion

16.	In which of the following substances the carbon atom is arranged in a regular tetrahedral structure[NCERT 1978]
Answer» In which of the following substances the carbon atom is arranged in a regular tetrahedral structure [NCERT 1978]

16.

In which of the following substances the carbon atom is arranged in a regular tetrahedral structure[NCERT 1978]

Answer»

In which of the following substances the carbon atom is arranged in a regular tetrahedral structure

[NCERT 1978]

Discussion

17.	α - helix structure of protein is stabilized by
Answer» α - helix structure of protein is stabilized by

Discussion

18.	CO2+H2O⇌ ?
Answer» $C O_{2} + H_{2} O ⇌$ ?

Discussion

19.	When the reaction between methyl iodide and sodium ethoxide occurs, we get
Answer» When the reaction between methyl iodide and sodium ethoxide occurs, we get

Discussion

20.	The true statement for the acids of phosphorus : H3PO2, H3PO3 and H3PO4 is
Answer» The true statement for the acids of phosphorus : $H_{3} P O_{2}$ , $H_{3} P O_{3}$ and $H_{3} P O_{4}$ is

Discussion

21.	While antacids and antiallergic drugs interfere with the function of histamines, why do these not interface with the function of each other ?
Answer» While antacids and antiallergic drugs interfere with the function of histamines, why do these not interface with the function of each other ?

Discussion

22.	The pair of electrons in the given carbanion, CH3C≡C−, is present in which orbital?
Answer» The pair of electrons in the given carbanion, $C H_{3} C \equiv C^{-}$ , is present in which orbital?

Discussion

23.	Anti-Markovnikov's rule for addition of HBr is not observed in:
Answer» Anti-Markovnikov's rule for addition of HBr is not observed in:

Discussion

24.	Explain the following terms : 1. Electrophoresis 2. Coagulation 3. Dialysis 4. Tyndall effect
Answer» Explain the following terms : 1. Electrophoresis 2. Coagulation 3. Dialysis 4. Tyndall effect

24.

Explain the following terms : 1. Electrophoresis 2. Coagulation 3. Dialysis 4. Tyndall effect

Answer»

Explain the following terms :

1. Electrophoresis

2. Coagulation

3. Dialysis

4. Tyndall effect

Discussion

25.	Saran is
Answer» Saran is

Discussion

26.	12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:
Answer» 12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:

Discussion

27.	A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure P and temperature T, whereas the other part is completely evacuated. If the valve is suddenly opened, the pressure and temperature of the gas respectively will be:
Answer» A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure P and temperature T, whereas the other part is completely evacuated. If the valve is suddenly opened, the pressure and temperature of the gas respectively will be:

Discussion

28.	(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCI ? (ii) What type of stoichiometric defect is shown by NaCI ?
Answer» (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCI ? (ii) What type of stoichiometric defect is shown by NaCI ?

Discussion

29.	Which of the following is coloured tetrahedral complex species?
Answer» Which of the following is coloured tetrahedral complex species?

Discussion

30.	Which of the following give no residue on heating ?
Answer» Which of the following give no residue on heating ?

Discussion

31.	Conductivity of saturated solution of silver phosphate is 9×10−6 S m−1 and equivalent conductivity 1.5 ×10−4 S m2/equivalent. Find Ksp of Ag3PO4.
Answer» Conductivity of saturated solution of silver phosphate is $9 \times 10^{- 6}$ $S m^{- 1}$ and equivalent conductivity $1.5 \times 10^{- 4}$ $S m^{2}$ /equivalent. Find $K_{s p}$ of $A g_{3} P O_{4}$ .

Discussion

32.	Hybridization of central I in I−3 is :
Answer» Hybridization of central I in $I_{3}^{-}$ is :

Discussion

33.	Assume you get to start with an alkyl halide. To synthesize the following via a single-step SN2 reaction, which of the following options is appropriate ?
Answer» Assume you get to start with an alkyl halide. To synthesize the following via a single-step $S_{N} 2$ reaction, which of the following options is appropriate ?

Discussion

34.	Amongst the following elements (whose electronic configuration are given below), the one having the highest ionisation energy is: (correct answer +1, wrong answer -0.25)
Answer» Amongst the following elements (whose electronic configuration are given below), the one having the highest ionisation energy is: (correct answer +1, wrong answer -0.25)

Discussion

35.	What is tendall effect?
Answer» What is tendall effect?

Discussion

36.	3.36 g of a dibromide of element X, XBr2 is completely converted into dichloride XCl2 forming 1.58 g of it (XCl2) XBr2+Cl2→XCl2+Br2 What is the atomic mass of element X?
Answer» $3.36 g$ of a dibromide of element X, $X B r_{2}$ is completely converted into dichloride $X C l_{2}$ forming $1.58 g$ of it $(X C l_{2})$ $X B r_{2} + C l_{2} \to X C l_{2} + B r_{2}$ What is the atomic mass of element X?

Discussion

37.	Consider the following cell Pt\|H2(P1 atm)\|H+(M1)\|\|H+(M2)\|H2(P2 atm)\|Pt where P1 and P2 are pressures. M1 and M2 are molarities . What will be the emf of cell at 25∘C If P1=P2 and M1 is 50% higher than M2 ? Repeat the magnitude of emf by multiplying with 10000. [Take : 2.303RTF=0.06and log 3=0.48,log2=0.3]
Answer» Consider the following cell $P t \| H_{2} (P_{1} a t m) \| H^{+} (M_{1}) \| \| H^{+} (M_{2}) \| H_{2} (P_{2} a t m) \| P t$ where $P_{1}$ and $P_{2}$ are pressures. $M_{1}$ and $M_{2}$ are molarities . What will be the emf of cell at $25^{\circ} C$ If $P_{1} = P_{2}$ and $M_{1}$ is 50% higher than $M_{2}$ ? Repeat the magnitude of emf by multiplying with 10000. [Take : $\frac{2.303 R T}{F} = 0.06 and log 3 = 0.48, log 2 = 0.3]$

Discussion

38.	In the Carius method for the estimation of phosphorus, 0.31 g of an organic compound gave 0.222 g of Mg2P2O7. The percentage of phosphorus in the organic compound is .
Answer» In the Carius method for the estimation of phosphorus, 0.31 g of an organic compound gave 0.222 g of $M g_{2} P_{2} O_{7}$ . The percentage of phosphorus in the organic compound is .

Discussion

39.	What is the basic principles of chromatography
Answer» What is the basic principles of chromatography

Discussion

40.	Which of the following reaction produces Hydrogen?
Answer» Which of the following reaction produces Hydrogen?

Discussion

41.	The Bohr orbit radius for the hydrogen atom ( n= 1) is approximately 0.530 A∘. The radius for the first excited state (n=2) orbit is:
Answer» The Bohr orbit radius for the hydrogen atom ( n= 1) is approximately 0.530 $A^{\circ}$ . The radius for the first excited state (n=2) orbit is:

Discussion

42.	The density of 3 molal sodium thiosulphate solution is 1.25g/cm3. The mole fraction of sodium thiosulphate is
Answer» The density of 3 molal sodium thiosulphate solution is $1.25 g / c m^{3}$ . The mole fraction of sodium thiosulphate is

Discussion

43.	How many moles of ch4 are required to produce 22 grams of CO2 after Commission? Calculate the amount of water produced in 16 grams of Methane.
Answer» How many moles of ch4 are required to produce 22 grams of CO2 after Commission? Calculate the amount of water produced in 16 grams of Methane.

43.

How many moles of ch4 are required to produce 22 grams of CO2 after Commission? Calculate the amount of water produced in 16 grams of Methane.

Answer»

How many moles of ch4 are required to produce 22 grams of CO2 after Commission?

Calculate the amount of water produced in 16 grams of Methane.

Discussion

44.	What isn1°,2°,3° and 4° of hydrocarbons
Answer» What isn1°,2°,3° and 4° of hydrocarbons

Discussion

45.	ZnO turns yellow on heating. Why?
Answer» ZnO turns yellow on heating. Why?

Discussion

46.	Degeneracy of H atom in 3rd excited State is 1) 16 2) 10 3) 12 4) 9
Answer» Degeneracy of H atom in 3rd excited State is 1) 16 2) 10 3) 12 4) 9

Discussion

47.	Suppose 0.5 mole of an ideal gas undergoes an isothermal expansion as energy is added to it as heat Q. Graph shows the variation volume vf versus heat added Q. The temperature of gas (in K) is (use ln3 ≈ 1 and R=253J/mol -K)
Answer» Suppose $0.5$ mole of an ideal gas undergoes an isothermal expansion as energy is added to it as heat $Q$ . Graph shows the variation volume $v_{f}$ versus heat added $Q$ . The temperature of gas (in K) is (use $l n 3 \approx 1$ and $R = \frac{25}{3} J/mol -K)$

Discussion

48.	Which of the following is formed by Swarts Reaction?
Answer» Which of the following is formed by Swarts Reaction?

Discussion

49.	What is the IUPAC name of following compound?
Answer» What is the IUPAC name of following compound?

Discussion

50.	The increasing order of reactivity among group 1 elements is Li < Na < K < Rb CI > Br > I. Explain.
Answer» The increasing order of reactivity among group 1 elements is Li < Na < K < Rb CI > Br > I. Explain.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the complex [CoCl2(en)2]Br, the co-ordination number and oxidation state of cobalt are:

20 ml of HCl solution requires 19.85 ml of 0.01 M NaOH solution for complete neutralization. The molarity of HCl solution is

For the two gaseous reactions, following data is given : A→B;k1=1010e−20000/T C→D;k2=1012e−24606/T the temperature at which k1 ​becomes equal to k2 ​ is:

The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is:

In fibrous proteins, polypeptide chains are held together by ........... . (a) van der Waals forces (b) disulphide linkage (c) electrostatic forces of attraction (d) hydrogen bonds

The decomposition of NH3 on platinum surface is zero order reaction. What are the rates of production of N_2 and H_2 if k=2.5×10−4 mol−1 Ls−1 ?

Sulphur when burnt in air forms:

What is the ratio of the volumes occupied by 2 moles of O2 and 2 moles of O3 at standard temperature and pressure ?

Identify the pair of compounds which cannot exist together in solution.

What is the major drawback of Fruendlich isotherm?

Electra has trouble finding the correct Nernst equation for the cell Zn(s)|Zn2+||Cu2+|Cu(s) at 25∘C Can you help her?

Among the following, the reaction that proceeds through an electrophilic substitution is:

In which of the following substances the carbon atom is arranged in a regular tetrahedral structure[NCERT 1978]

α - helix structure of protein is stabilized by

CO2+H2O⇌ ?

When the reaction between methyl iodide and sodium ethoxide occurs, we get

The true statement for the acids of phosphorus : H3PO2, H3PO3 and H3PO4 is

While antacids and antiallergic drugs interfere with the function of histamines, why do these not interface with the function of each other ?

The pair of electrons in the given carbanion, CH3C≡C−, is present in which orbital?

Anti-Markovnikov's rule for addition of HBr is not observed in:

Explain the following terms : 1. Electrophoresis 2. Coagulation 3. Dialysis 4. Tyndall effect

Saran is

12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:

(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCI ? (ii) What type of stoichiometric defect is shown by NaCI ?

Which of the following is coloured tetrahedral complex species?

Which of the following give no residue on heating ?

Conductivity of saturated solution of silver phosphate is 9×10−6 S m−1 and equivalent conductivity 1.5 ×10−4 S m2/equivalent. Find Ksp of Ag3PO4.

Hybridization of central I in I−3 is :

Assume you get to start with an alkyl halide. To synthesize the following via a single-step SN2 reaction, which of the following options is appropriate ?

Amongst the following elements (whose electronic configuration are given below), the one having the highest ionisation energy is: (correct answer +1, wrong answer -0.25)

What is tendall effect?

3.36 g of a dibromide of element X, XBr2 is completely converted into dichloride XCl2 forming 1.58 g of it (XCl2) XBr2+Cl2→XCl2+Br2 What is the atomic mass of element X?

In the Carius method for the estimation of phosphorus, 0.31 g of an organic compound gave 0.222 g of Mg2P2O7. The percentage of phosphorus in the organic compound is .

What is the basic principles of chromatography

Which of the following reaction produces Hydrogen?

The Bohr orbit radius for the hydrogen atom ( n= 1) is approximately 0.530 A∘. The radius for the first excited state (n=2) orbit is:

The density of 3 molal sodium thiosulphate solution is ​​​​​1.25g/cm3. The mole fraction of sodium thiosulphate is

How many moles of ch4 are required to produce 22 grams of CO2 after Commission? Calculate the amount of water produced in 16 grams of Methane.

What isn1°,2°,3° and 4° of hydrocarbons

ZnO turns yellow on heating. Why?

Degeneracy of H atom in 3rd excited State is 1) 16 2) 10 3) 12 4) 9

Suppose 0.5 mole of an ideal gas undergoes an isothermal expansion as energy is added to it as heat Q. Graph shows the variation volume vf versus heat added Q. The temperature of gas (in K) is (use ln3 ≈ 1 and R=253J/mol -K)

Which of the following is formed by Swarts Reaction?

What is the IUPAC name of following compound?

The increasing order of reactivity among group 1 elements is Li &lt; Na &lt; K &lt; Rb CI &gt; Br &gt; I. Explain.

For the two gaseous reactions, following data is given : A→B;k1=1010e−20000/T C→D;k2=1012e−24606/T the temperature at which k1 becomes equal to k2 is:

The density of 3 molal sodium thiosulphate solution is 1.25g/cm3. The mole fraction of sodium thiosulphate is

The increasing order of reactivity among group 1 elements is Li < Na < K < Rb CI > Br > I. Explain.