46295 + Interview Questions in Chemistry

1.	When dil. H2SO4 is electrolysed by using platinum electrodes the gas evolved at cathode is
Answer» When dil. $H_{2} S O_{4}$ is electrolysed by using platinum electrodes the gas evolved at cathode is

Discussion

2.	There are three samples of H2O2 labelled as 10 vol., 15 vol., and 20 vol. Half litre of each sample is mixed and then diluted with equal volumes of water. Calculate the volume strength of the resultant solution.
Answer» There are three samples of $H_{2} O_{2}$ labelled as $10 vol$ ., 1 $5 vol$ ., and $20 vol$ . Half litre of each sample is mixed and then diluted with equal volumes of water. Calculate the volume strength of the resultant solution.

Discussion

3.	Which of the following is most powerful oxidizing agent
Answer» Which of the following is most powerful oxidizing agent

Discussion

4.	Which of the following statements is not characteristic of free radical chain reaction
Answer» Which of the following statements is not characteristic of free radical chain reaction

4.

Which of the following statements is not characteristic of free radical chain reaction

Answer»

Which of the following statements is not characteristic of free radical chain reaction

Discussion

5.	Solubility product of silver bromide is 5.0×10−13. The quantity of potassium bromide (molar mass is 120 gmol−1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is:
Answer» Solubility product of silver bromide is $5.0 \times 10^{- 13}$ . The quantity of potassium bromide (molar mass is 120 gmol $^{- 1})$ to be added to 1 litre of $0.05 M$ solution of silver nitrate to start the precipitation of $A g B r$ is:

Discussion

6.	Helium is the second most abundant element in the Universe. Yet, it is not the most abundant on Earth - Why?
Answer» Helium is the second most abundant element in the Universe. Yet, it is not the most abundant on Earth - Why?

Discussion

7.	The major product of the following reaction sequence is :
Answer» The major product of the following reaction sequence is :

7.

The major product of the following reaction sequence is :

Answer»

The major product of the following reaction sequence is :

Discussion

8.	What is the energy of a hydrogen atom in the first exc ited state if the potential energy is taken to be zero in the ground state ?
Answer» What is the energy of a hydrogen atom in the first exc ited state if the potential energy is taken to be zero in the ground state ?

Discussion

9.	Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential (E⊖) of two half cell reactions decided which way the reaction is expected to proceed. A simple example is a Daniell cell in which zinc goes into solution and copper gets deposited. Given below are a set of half cell reactions (acidic medium) along with their E⊖ (V with respect to normal hydrogen electrode) values. Using this data, obtain correct explanations for the following question I2+2e−→2I⊖; E⊖=0.54 Cl2+2e−→2Cl⊖; E⊖=1.36 Mn3++e−→Mn2+; E⊖=1.50 Fe3++e−→Fe2+; E⊖=0.77 O2+4H⨁+4e−→2H2O; E⊖=1.23 While Fe3+ is stable, Mn3+ is not stable in acid solution because
Answer» Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential $(E_{⊖})$ of two half cell reactions decided which way the reaction is expected to proceed. A simple example is a Daniell cell in which zinc goes into solution and copper gets deposited. Given below are a set of half cell reactions (acidic medium) along with their $E_{⊖}$ (V with respect to normal hydrogen electrode) values. Using this data, obtain correct explanations for the following question $I_{2} + 2 e^{-} \to 2 I^{⊖}; E^{⊖} = 0.54$ $C l_{2} + 2 e^{-} \to 2 C l^{⊖}; E^{⊖} = 1.36$ $M n^{3 +} + e^{-} \to M n^{2 +}; E^{⊖} = 1.50$ $F e^{3 +} + e^{-} \to F e^{2 +}; E^{⊖} = 0.77$ $O_{2} + 4 H^{⨁} + 4 e^{-} \to 2 H_{2} O; E^{⊖} = 1.23$ While $F e^{3 +}$ is stable, $M n^{3 +}$ is not stable in acid solution because

Discussion

10.	Consider the following plots of rate constant versus 1T for four different reactions. Which of the following orders is correct for the activation energies of these reactions?
Answer» Consider the following plots of rate constant versus $\frac{1}{T}$ for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

Discussion

11.	H2O2 is obtained by adding dilute H2SO4 to
Answer» $H_{2} O_{2}$ is obtained by adding dilute $H_{2} S O_{4}$ to

Discussion

12.	In the rusting of Iron, which of the following cell reactions occurs at the anode?
Answer» In the rusting of Iron, which of the following cell reactions occurs at the anode?

Discussion

13.	The radius of which of the following orbits is the same as that of the first Bohr's orbit of hydrogen atom?
Answer» The radius of which of the following orbits is the same as that of the first Bohr's orbit of hydrogen atom?

Discussion

14.	The most efficient agent for the absorption of SO3 is
Answer» The most efficient agent for the absorption of $S O_{3}$ is

Discussion

15.	When electrophile attacks on carbon atom of the benzene to form carbonium ion, the hybridsation of that 'C' changes from
Answer» When electrophile attacks on carbon atom of the benzene to form carbonium ion, the hybridsation of that 'C' changes from

Discussion

16.	Which of the following molecule can exhibit conformation isomerism?
Answer» Which of the following molecule can exhibit conformation isomerism?

Discussion

17.	Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be
Answer» Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be

Discussion

18.	A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. Its density is 2.5 g/litre and one mole of the gas occupies 44.8 L of space at a particular temperature and pressure. Determine the molecular formula of the compound.
Answer» A gaseous compound is composed of $85.7 %$ by mass carbon and $14.3 %$ by mass hydrogen. Its density is $2.5$ g/litre and one mole of the gas occupies 44.8 L of space at a particular temperature and pressure. Determine the molecular formula of the compound.

Discussion

19.	Which of the following gases in not a green house gas?
Answer» Which of the following gases in not a green house gas?

Discussion

20.	The most suitable method for the separation of a mixture of ortho and para nitrophenola mixed in a ratio of 1:1 is:
Answer» The most suitable method for the separation of a mixture of ortho and para nitrophenola mixed in a ratio of 1:1 is:

Discussion

21.	Calculate the number of atoms of oxygen present in 120g of nitric acid.
Answer» Calculate the number of atoms of oxygen present in 120g of nitric acid.

Discussion

22.	The wavelength of the radiation emitted,when a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant =1.097×107 m-1)
Answer» The wavelength of the radiation emitted,when a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant =1.097×10⁷ m^-1)

Discussion

23.	What weight of sodium hydroxide is required to neutralize 100ml of 0.1N HCl
Answer» What weight of sodium hydroxide is required to neutralize 100ml of 0.1N HCl

Discussion

24.	An open vessel at 27 ∘C is heated until 38th of the air in it has been expelled. Calculate the temperature at which the vessel was heated to.
Answer» An open vessel at $27^{\circ} C$ is heated until ${\frac{3}{8}}^{t h}$ of the air in it has been expelled. Calculate the temperature at which the vessel was heated to.

Discussion

25.	Iodoform can be prepared from all except
Answer» Iodoform can be prepared from all except

Discussion

26.	A substance which gives brick red flame test and breaks down when heated to give oxygen and a brown gas is
Answer» A substance which gives brick red flame test and breaks down when heated to give oxygen and a brown gas is

Discussion

27.	Heat of neutralization of strong acid against strong base is constant and is equal to
Answer» Heat of neutralization of strong acid against strong base is constant and is equal to

Discussion

28.	Question 14 Which of the following statements is false? (a) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point. (b) The osmotic pressure of a solution is given by the equation π=CRT (where, C is the molarity of the solution) (c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is BaCl2 > KCl > CH3COOH > sucrose (d) According to Raoult's law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution
Answer» Question 14 Which of the following statements is false? (a) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point. (b) The osmotic pressure of a solution is given by the equation $π = C R T$ (where, C is the molarity of the solution) (c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is $B a C l_{2} > K C l > C H_{3} C O O H > s u c r o s e$ (d) According to Raoult's law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution

Discussion

29.	Identify the correct statements for the behavoiur of ethane-1, 2-diamine as a ligand. (a) It is a neutral ligand (b) It is a didentate ligand (c) It is a chelating ligand (d) It is a unidentate ligand
Answer» Identify the correct statements for the behavoiur of ethane-1, 2-diamine as a ligand. (a) It is a neutral ligand (b) It is a didentate ligand (c) It is a chelating ligand (d) It is a unidentate ligand

Discussion

30.	Passage of one ampere current through 0.1 M Ni(NO3)2 solution using Ni electrodes bring in the concerntration of solution to _________in 60 seconds: 0.1M 0.05M 0.2M 0.025M
Answer» Passage of one ampere current through 0.1 M Ni(NO₃)₂ solution using Ni electrodes bring in the concerntration of solution to _________in 60 seconds: 0.1M 0.05M 0.2M 0.025M

30.

Passage of one ampere current through 0.1 M Ni(NO3)2 solution using Ni electrodes bring in the concerntration of solution to _________in 60 seconds: 0.1M 0.05M 0.2M 0.025M

Answer»

Passage of one ampere current through 0.1 M Ni(NO₃)₂ solution using Ni electrodes bring in the concerntration of solution to _________in 60 seconds:

0.1M
0.05M
0.2M
0.025M

Discussion

31.	21.6 g of silver coin is dissolved in HNO3. When NaCl is added to this solution, all silver is precipitated as AgCl. The weight of AgCl is found to be 14.35 g, then % of silver in coin is:
Answer» 21.6 g of silver coin is dissolved in $H N O_{3}$ . When $N a C l$ is added to this solution, all silver is precipitated as $A g C l$ . The weight of $A g C l$ is found to be 14.35 g, then % of silver in coin is:

Discussion

32.	The correct order of increasing ionic radius for F−, Na+, S2−, Cl− and K+ is:
Answer» The correct order of increasing ionic radius for $F^{-}, N a^{+}, S^{2 -}, C l^{-}$ and $K^{+}$ is:

Discussion

33.	A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids and strong alkalis. C gives an aqueous solution which is strongly alkaline Which of the following statements is/are true I : The three elements are metals II : The electronegativities decrease from X to Y to Z. III : The atomic radius decreases in the order X, Y and Z. IV : X, Y and Z could be phosphorus, aluminium and sodium respectively :
Answer» A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids and strong alkalis. C gives an aqueous solution which is strongly alkaline Which of the following statements is/are true I : The three elements are metals II : The electronegativities decrease from X to Y to Z. III : The atomic radius decreases in the order X, Y and Z. IV : X, Y and Z could be phosphorus, aluminium and sodium respectively :

33.

A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids and strong alkalis. C gives an aqueous solution which is strongly alkaline Which of the following statements is/are true I : The three elements are metals II : The electronegativities decrease from X to Y to Z. III : The atomic radius decreases in the order X, Y and Z. IV : X, Y and Z could be phosphorus, aluminium and sodium respectively :

Answer»

A, B and C are hydroxy-compounds of the elements X, Y and Z respectively. X, Y and Z are in the same period of the periodic table. A gives an aqueous solution of pH less than seven. B reacts with both strong acids and strong alkalis. C gives an aqueous solution which is strongly alkaline

Which of the following statements is/are true

I : The three elements are metals

II : The electronegativities decrease from X to Y to Z.

III : The atomic radius decreases in the order X, Y and Z.

IV : X, Y and Z could be phosphorus, aluminium and sodium respectively :

Discussion

34.	The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl2.6H2O to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of NiCl2.6H2O are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is . (Atomic weights in g mol−1 : H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)
Answer» The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by $N i C l_{2} . 6 H_{2} O$ to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of $N i C l_{2} .6 H_{2} O$ are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is . (Atomic weights in g $m o l^{- 1}$ : $H$ = 1, $N$ = 14, $O$ = 16, $S$ = 32, $C l$ = 35.5, $C a$ = 40, $N i$ = 59)

Discussion

35.	Standard electrode potential is a intensive property or extensive property ? Give reasons.
Answer» Standard electrode potential is a intensive property or extensive property ? Give reasons.

Discussion

36.	IUPAC name of ethylidene cholride is 1,2-dichloroethane. Does 'ene' in ethylidene not represent double bond ?
Answer» IUPAC name of ethylidene cholride is 1,2-dichloroethane. Does 'ene' in ethylidene not represent double bond ?

Discussion

37.	If the value of azimuthal quantum number is 3, the possible values of magnetic quantum numbers would be:
Answer» If the value of azimuthal quantum number is 3, the possible values of magnetic quantum numbers would be:

Discussion

38.	How much CaO is obtained when 95% pure 200kg of CaCO3 is heated?
Answer» How much CaO is obtained when 95% pure $200 k g$ of $C a C O_{3}$ is heated?

Discussion

39.	Which of the following orbitals does not exist according to quantum theory?
Answer» Which of the following orbitals does not exist according to quantum theory?

Discussion

40.	How to answer this question in board to gain cent marks. Explain why the free surface of some liquid in contact with a solid is not horizontal.
Answer» How to answer this question in board to gain cent marks. Explain why the free surface of some liquid in contact with a solid is not horizontal.

40.

How to answer this question in board to gain cent marks. Explain why the free surface of some liquid in contact with a solid is not horizontal.

Answer»

How to answer this question in board to gain cent marks.

Explain why the free surface of some liquid in contact with a solid is not horizontal.

Discussion

41.	What role does adsorption play in heterogeneous catalysis?
Answer» What role does adsorption play in heterogeneous catalysis?

Discussion

42.	What is the diff between sparingly and slightly soluble salts?
Answer» What is the diff between sparingly and slightly soluble salts?

Discussion

43.	X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608 × 10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper.
Answer» X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608 × 10^-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm³, calculate the atomic mass of copper.

Discussion

44.	The statement(s) true for a 109% oleum sample is/are:
Answer» The statement(s) true for a 109% oleum sample is/are:

Discussion

45.	How would you say that all ferroelectric solids are piezoelectric,but all piezoelectric solids are not ferroelectric solids?? Explain to satisfy this statement.
Answer» How would you say that all ferroelectric solids are piezoelectric,but all piezoelectric solids are not ferroelectric solids?? Explain to satisfy this statement.

Discussion

46.	Dry slaked lime on reaction with chlorine gives
Answer» Dry slaked lime on reaction with chlorine gives

Discussion

47.	(CH3)3CClNaCN−−−−→Adil.H2SO4−−−−−−→B. Compund B is
Answer» $(C H_{3})_{3} C C l N a C N - --- \to A d i l . H_{2} S O_{4} - ----- \to B$ . Compund B is

Discussion

48.	The equilibrium constant at 298 K for a reaction A+B⇌C+D is 100. If the initial concentration of all the four species were 1 M each, then equilibrium concentration of D (in mol/l) will be:
Answer» The equilibrium constant at $298 K$ for a reaction $A + B ⇌ C + D$ is $100$ . If the initial concentration of all the four species were $1 M$ each, then equilibrium concentration of $D (in mol/l)$ will be:

Discussion

49.	An impure sample of As2O3 weighing 20 gm was dissolved in water containing 10 gm of NaHCO3 and the final solution was diluted to 400mL. 20 mL of this solution was oxidised by 25 mL of a solution of I2. Another solution of hypo containing 1.24 gm of Na2S2O3.5H2O in 40 mL was used to exactly reduce 25 mL of same I2 solution (impurities inert) calculate % of As2O3 in the sample (at. wt. of As = 75)
Answer» An impure sample of $A s_{2} O_{3}$ weighing $20 g m$ was dissolved in water containing $10 g m o f N a H C O_{3}$ and the final solution was diluted to $400 m L$ . $20 m L$ of this solution was oxidised by $25 m L$ of a solution of $I_{2}$ . Another solution of hypo containing $1.24 g m$ of $N a_{2} S_{2} O_{3} .5 H_{2} O$ in $40 m L$ was used to exactly reduce $25 m L$ of same $I_{2}$ solution (impurities inert) calculate % of $A s_{2} O_{3}$ in the sample (at. wt. of As = 75)

Discussion

50.	The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are
Answer» The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

When dil. H2SO4 is electrolysed by using platinum electrodes the gas evolved at cathode is

There are three samples of H2O2 labelled as 10 vol., 15 vol., and 20 vol. Half litre of each sample is mixed and then diluted with equal volumes of water. Calculate the volume strength of the resultant solution.

Which of the following is most powerful oxidizing agent

Which of the following statements is not characteristic of free radical chain reaction

Solubility product of silver bromide is 5.0×10−13. The quantity of potassium bromide (molar mass is 120 gmol−1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is:

Helium is the second most abundant element in the Universe. Yet, it is not the most abundant on Earth - Why?

The major product of the following reaction sequence is :

What is the energy of a hydrogen atom in the first exc ited state if the potential energy is taken to be zero in the ground state ?

Consider the following plots of rate constant versus 1T for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

H2O2 is obtained by adding dilute H2SO4 to

In the rusting of Iron, which of the following cell reactions occurs at the anode?

The radius of which of the following orbits is the same as that of the first Bohr's orbit of hydrogen atom?

The most efficient agent for the absorption of SO3 is

When electrophile attacks on carbon atom of the benzene to form carbonium ion, the hybridsation of that 'C' changes from

Which of the following molecule can exhibit conformation isomerism?

Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be

A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. Its density is 2.5 g/litre and one mole of the gas occupies 44.8 L of space at a particular temperature and pressure. Determine the molecular formula of the compound.

Which of the following gases in not a green house gas?

The most suitable method for the separation of a mixture of ortho and para nitrophenola mixed in a ratio of 1:1 is:

Calculate the number of atoms of oxygen present in 120g of nitric acid.

The wavelength of the radiation emitted,when a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant =1.097×107 m-1)

What weight of sodium hydroxide is required to neutralize 100ml of 0.1N HCl

An open vessel at 27 ∘C is heated until 38th of the air in it has been expelled. Calculate the temperature at which the vessel was heated to.

Iodoform can be prepared from all except

A substance which gives brick red flame test and breaks down when heated to give oxygen and a brown gas is

Heat of neutralization of strong acid against strong base is constant and is equal to

Identify the correct statements for the behavoiur of ethane-1, 2-diamine as a ligand. (a) It is a neutral ligand (b) It is a didentate ligand (c) It is a chelating ligand (d) It is a unidentate ligand

Passage of one ampere current through 0.1 M Ni(NO3)2 solution using Ni electrodes bring in the concerntration of solution to _________in 60 seconds: 0.1M 0.05M 0.2M 0.025M

21.6 g of silver coin is dissolved in HNO3. When NaCl is added to this solution, all silver is precipitated as AgCl. The weight of AgCl is found to be 14.35 g, then % of silver in coin is:

The correct order of increasing ionic radius for F−, Na+, S2−, Cl− and K+ is:

Standard electrode potential is a intensive property or extensive property ? Give reasons.

IUPAC name of ethylidene cholride is 1,2-dichloroethane. Does 'ene' in ethylidene not represent double bond ?

If the value of azimuthal quantum number is 3, the possible values of magnetic quantum numbers would be:

How much CaO is obtained when 95% pure 200kg of CaCO3 is heated?

Which of the following orbitals does not exist according to quantum theory?

How to answer this question in board to gain cent marks. Explain why the free surface of some liquid in contact with a solid is not horizontal.

What role does adsorption play in heterogeneous catalysis?

What is the diff between sparingly and slightly soluble salts?

X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608 × 10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper.

The statement(s) true for a 109% oleum sample is/are:

How would you say that all ferroelectric solids are piezoelectric,but all piezoelectric solids are not ferroelectric solids?? Explain to satisfy this statement.

Dry slaked lime on reaction with chlorine gives

(CH3)3CClNaCN−−−−→Adil.H2SO4−−−−−−→B. Compund B is

The equilibrium constant at 298 K for a reaction A+B⇌C+D is 100. If the initial concentration of all the four species were 1 M each, then equilibrium concentration of D (in mol/l) will be:

The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are