46295 + Interview Questions in Chemistry

1.	The number of atoms in each unit cell in ccp structure is:
Answer» The number of atoms in each unit cell in ccp structure is:

1.

The number of atoms in each unit cell in ccp structure is:

Answer»

The number of atoms in each unit cell in ccp structure is:

2.	A compound of vanadium has a magnetic moment of 1.73 BM. Vanadium chloride has the formula:
Answer» A compound of vanadium has a magnetic moment of 1.73 BM. Vanadium chloride has the formula:

Discussion

3.	Magnesium chloride crystallizes as
Answer» Magnesium chloride crystallizes as

Discussion

4.	Nucleophilic addition reaction will be most favoured in:
Answer» Nucleophilic addition reaction will be most favoured in:

Discussion

5.	The dihedral angle between the two methyl groups in gauche conformation of n-butane is
Answer» The dihedral angle between the two methyl groups in gauche conformation of n-butane is

Discussion

6.	Which of the following reactions are both stereospecific and stereoselective?
Answer» Which of the following reactions are both stereospecific and stereoselective?

Discussion

7.	A following mechanism has been proposed for a reaction The rate law expression for the reaction is:
Answer» A following mechanism has been proposed for a reaction The rate law expression for the reaction is:

7.

A following mechanism has been proposed for a reaction The rate law expression for the reaction is:

Answer»

A following mechanism has been proposed for a reaction

The rate law expression for the reaction is:

Discussion

8.	Phthalic acid reacts with ammonia to give ammonium salt which on further heating at high temperature gives:
Answer» Phthalic acid reacts with ammonia to give ammonium salt which on further heating at high temperature gives:

8.

Phthalic acid reacts with ammonia to give ammonium salt which on further heating at high temperature gives:

Answer»

Phthalic acid reacts with ammonia to give ammonium salt which on further heating at high temperature gives:

Discussion

9.	Which of the following forms a diatomic molecule?
Answer» Which of the following forms a diatomic molecule?

Discussion

10.	The alkyl cyanides when hydrolysed to the corresponding acid, the gas evolved is
Answer» The alkyl cyanides when hydrolysed to the corresponding acid, the gas evolved is

Discussion

11.	Li exhibits diagonal relationship with
Answer» Li exhibits diagonal relationship with

Discussion

12.	The most stable carbocation is:
Answer» The most stable carbocation is:

Discussion

13.	The CFSE for octahedral [CoCl6]4− is 18000 cm−1. The CFSE for tetrahedral [CoCl4]2− will be
Answer» The CFSE for octahedral $[C o C l_{6}]^{4 -}$ is 18000 $c m^{- 1}$ . The CFSE for tetrahedral $[C o C l_{4}]^{2 -}$ will be

Discussion

14.	Question 08 Number of π bonds and σ bonds in the following structure is (a) 6, 19 (b) 4, 20 (c) 5, 19 (d) 5, 20
Answer» Question 08 Number of $π$ bonds and $σ$ bonds in the following structure is (a) 6, 19 (b) 4, 20 (c) 5, 19 (d) 5, 20

14.

Question 08 Number of π bonds and σ bonds in the following structure is (a) 6, 19 (b) 4, 20 (c) 5, 19 (d) 5, 20

Answer»

Question 08

Number of $π$ bonds and $σ$ bonds in the following structure is

(a) 6, 19

(b) 4, 20

(c) 5, 19

(d) 5, 20

Discussion

15.	The commercial name of polyacrylonitrile is ........... (a) dacron (b) orlon (acrilan) (c) PVC (d) bakelite
Answer» The commercial name of polyacrylonitrile is ........... (a) dacron (b) orlon (acrilan) (c) PVC (d) bakelite

15.

The commercial name of polyacrylonitrile is ........... (a) dacron (b) orlon (acrilan) (c) PVC (d) bakelite

Answer»

The commercial name of polyacrylonitrile is ...........

(a) dacron

(b) orlon (acrilan)

(c) PVC

(d) bakelite

Discussion

16.	Niobium crystallises in body - centred cubic structure. If density is 8.55 g cm−3. Calculate atomic radius of niobium using its atomic mass 93 u.
Answer» Niobium crystallises in body - centred cubic structure. If density is $8.55 g c m^{- 3}$ . Calculate atomic radius of niobium using its atomic mass 93 u.

Discussion

17.	What is demulsification ? Name two demulsifiers ?
Answer» What is demulsification ? Name two demulsifiers ?

Discussion

18.	Which of the following compound has the highest dipole moment?
Answer» Which of the following compound has the highest dipole moment?

Discussion

19.	If 5 moles of CaCl2 is mixed with 2 moles of Na3PO4 the maximum number of moles of Ca3(PO4)2 formed will be: CaCl2+Na3PO4→Ca3(PO4)2+NaCl
Answer» If 5 moles of $C a C l_{2}$ is mixed with 2 moles of $N a_{3} P O_{4}$ the maximum number of moles of $C a_{3} (P O_{4})_{2}$ formed will be: $C a C l_{2} + N a_{3} P O_{4} \to C a_{3} (P O_{4})_{2} + N a C l$

Discussion

20.	The half - life of a radioactive element is 30 min. The time interval between the stages of 33.3% and 67.7% decay will be ?
Answer» The half - life of a radioactive element is 30 min. The time interval between the stages of 33.3% and 67.7% decay will be ?

Discussion

21.	Statement I: Neutron to proton ratio less than 1 especially in a heavy nucleus makes it highly unstable. Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.
Answer» Statement I: Neutron to proton ratio less than 1 especially in a heavy nucleus makes it highly unstable. Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.

Discussion

22.	Which best describes the product of the following reaction?
Answer» Which best describes the product of the following reaction?

Discussion

23.	For 109% labeled oleum if the number of moles of H2SO4 and free SO3 be x and y respectively,then what will be the value of x+yx−y?
Answer» For $109 %$ labeled oleum if the number of moles of $H_{2} S O_{4}$ and free $S O_{3}$ be x and y respectively,then what will be the value of $\frac{x + y}{x - y} ?$

Discussion

24.	3.2 g of pyrolusite (MnO2) was treated with 50 mL of 0.5 M oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to 250 mL in a flask. 25 mL of this solution when treated with 0.02 M KMnO4 required 32 mL of the solution. Find the percentage of MnO2 in the sample. Given: Atomic mass of Mn is 55 g mol−1
Answer» $3.2 g$ of pyrolusite $(M n O_{2})$ was treated with $50 m L$ of $0.5 M$ oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to $250 m L$ in a flask. $25 m L$ of this solution when treated with $0.02 M K M n O_{4}$ required $32 m L$ of the solution. Find the percentage of $M n O_{2}$ in the sample. Given: Atomic mass of $M n$ is $55 g m o l^{- 1}$

Discussion

25.	X and Y are two compounds of elements A and Cl. Molar mass and mass % of Cl are given in the table below. CompoundMolar mass% of ClX13777.5Y20885.1 Thus, X and Y are:
Answer» X and Y are two compounds of elements A and Cl. Molar mass and mass % of Cl are given in the table below. $\begin{matrix} Compound & Molar mass & % of Cl X & 137 & 77.5 Y & 208 & 85.1 \end{matrix}$ Thus, X and Y are:

Discussion

26.	On the surface of the earth at 1 atm pressure, a balloon filled with H2 gas occupies 500 mL, the volume being 5/6 of its maximum capacity. The balloon is left in air. It starts rising. The height above which the balloon will burst if temperature of the atmosphere remains constant and the pressure decreases by 1 mm of Hg for every 100 cm rise of height is?
Answer» On the surface of the earth at $1 atm$ pressure, a balloon filled with $H_{2}$ gas occupies $500 mL$ , the volume being $5 / 6$ of its maximum capacity. The balloon is left in air. It starts rising. The height above which the balloon will burst if temperature of the atmosphere remains constant and the pressure decreases by $1 mm$ of Hg for every $100 cm$ rise of height is?

Discussion

27.	A sample of 2.5 mol of hydrazine (N2H4) loses 25 mol of electrons on being converted to a new compound X. Assuming that there is no loss of nitrogen in the formation of the new compound and the oxidation state of H+ is +1 throughout the reaction, then what is the oxidation number of nitrogen in compound X?
Answer» A sample of $2.5 m o l$ of hydrazine $(N_{2} H_{4})$ loses $25 m o l$ of electrons on being converted to a new compound $X$ . Assuming that there is no loss of nitrogen in the formation of the new compound and the oxidation state of $H^{+}$ is $+ 1$ throughout the reaction, then what is the oxidation number of nitrogen in compound $X$ ?

Discussion

28.	How many resonating structures are possible for the given molecule?
Answer» How many resonating structures are possible for the given molecule?

Discussion

29.	Cis isomer have:
Answer» Cis isomer have:

Discussion

30.	Rate of change of weight near the earth's surface varies with height h (h<<R where R is the radius of the Earth) as
Answer» Rate of change of weight near the earth's surface varies with height h (h<<R where R is the radius of the Earth) as

Discussion

31.	Treatment of primary amines with nitrous acid gives diazonium ions, which decompose under the diazotization conditions to give a complex mixture of products. Aryldiazonium ions are stable and is a valuable intermediate. They react with activated aromatic compounds to give a coupling product. Which of the following diazonium ion is the most reactive towards an azo coupling reaction?
Answer» Treatment of primary amines with nitrous acid gives diazonium ions, which decompose under the diazotization conditions to give a complex mixture of products. Aryldiazonium ions are stable and is a valuable intermediate. They react with activated aromatic compounds to give a coupling product. Which of the following diazonium ion is the most reactive towards an azo coupling reaction?

Discussion

32.	Which phenomenon is not shown by alkenes?
Answer» Which phenomenon is not shown by alkenes?

Discussion

33.	The conversion of PbO2 to Pb(NO3)2 is
Answer» The conversion of $P b O_{2} t o P b (N O_{3})_{2}$ is

Discussion

34.	The solubilities of carbonates decreases down the magnesium group due to a decrease in
Answer» The solubilities of carbonates decreases down the magnesium group due to a decrease in

34.

The solubilities of carbonates decreases down the magnesium group due to a decrease in

Answer»

The solubilities of carbonates decreases down the magnesium group due to a decrease in

Discussion

35.	The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 7 g of salt in 100 g of water at 100∘C is 70%. The vapour pressure of solution is:
Answer» The degree of dissociation of $C a (N O_{3})_{2}$ in a dilute aqueous solution containing 7 g of salt in 100 g of water at $100^{\circ} C$ is $70 %$ . The vapour pressure of solution is:

Discussion

36.	What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:
Answer» What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:

Discussion

37.	Iodoform can be prepared from all, except
Answer» Iodoform can be prepared from all, except

Discussion

38.	Calculate the number of formula units of Na2SO4 in 49 millimoles of a pure sample of Na2SO4.
Answer» Calculate the number of formula units of $N a_{2} S O_{4}$ in $\frac{4}{9}$ millimoles of a pure sample of $N a_{2} S O_{4}$ .

Discussion

39.	The vapour pressure of pure water at 1000c is 760mm of Hg while that of dilute solution of urea is 740mm of Hg. Then mass of urea present in 7.60g water is
Answer» The vapour pressure of pure water at 100⁰c is 760mm of Hg while that of dilute solution of urea is 740mm of Hg. Then mass of urea present in 7.60g water is

Discussion

40.	Total number of isomers considering both structural and stereoisomers, of cyclic ethers with the molecular formula C4H8O is:
Answer» Total number of isomers considering both structural and stereoisomers, of cyclic ethers with the molecular formula $C_{4} H_{8} O$ is:

Discussion

41.	What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed to obtain 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?
Answer» What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed to obtain 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

Discussion

42.	A compound is reacted according to the reaction sequence given below to give product 'A'. Identify 'A':
Answer» A compound is reacted according to the reaction sequence given below to give product 'A'. Identify 'A':

Discussion

43.	Which conformation of C6H6CI6 is most powerful insecticide
Answer» Which conformation of C₆H₆CI₆ is most powerful insecticide

Discussion

44.	Choose the corect order of atomic radii of fluorine and neon (in pm ) out of the options given below and justify your answer. (a) 72, 160 (b) 160, 160 (c) 72, 7 (d) 160, 72
Answer» Choose the corect order of atomic radii of fluorine and neon (in pm ) out of the options given below and justify your answer. (a) 72, 160 (b) 160, 160 (c) 72, 7 (d) 160, 72

Discussion

45.	The reaction: is called:
Answer» The reaction: is called:

45.

The reaction: is called:

Answer»

The reaction:

is called:

Discussion

46.	Ether is more volatile than alcohol having same molecular formula. This is due to:
Answer» Ether is more volatile than alcohol having same molecular formula. This is due to:

Discussion

47.	Which reaction shows oxidizing nature of sulphuric acid:
Answer» Which reaction shows oxidizing nature of sulphuric acid:

Discussion

48.	Oxidation of toluene with CrO3 to benzaldehyde is carried out in the presence of acetic anhydride. Explain why.
Answer» Oxidation of toluene with $C r O_{3}$ to benzaldehyde is carried out in the presence of acetic anhydride. Explain why.

Discussion

49.	The correct order in which the first ionization enthalpy increases is
Answer» The correct order in which the first ionization enthalpy increases is

Discussion

50.	From: SF4,BrF3,XeF2,IF5,SbF−4.SF−5,SeF+3,CH+3,PCl+4, the total number of planar species is/are:
Answer» From: $S F_{4}, B r F_{3}, X e F_{2}, I F_{5}, S b F_{4}^{-} . S F_{5}^{-}, S e F_{3}^{+}, C H_{3}^{+}, P C l_{4}^{+}$ , the total number of planar species is/are:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The number of atoms in each unit cell in ccp structure is:

A compound of vanadium has a magnetic moment of 1.73 BM. Vanadium chloride has the formula:

Magnesium chloride crystallizes as

Nucleophilic addition reaction will be most favoured in:

The dihedral angle between the two methyl groups in gauche conformation of n-butane is

Which of the following reactions are both stereospecific and stereoselective?

A following mechanism has been proposed for a reaction The rate law expression for the reaction is:

Phthalic acid reacts with ammonia to give ammonium salt which on further heating at high temperature gives:

Which of the following forms a diatomic molecule?

The alkyl cyanides when hydrolysed to the corresponding acid, the gas evolved is

Li exhibits diagonal relationship with

The most stable carbocation is:

The CFSE for octahedral [CoCl6]4− is 18000 cm−1. The CFSE for tetrahedral [CoCl4]2− will be

Question 08 Number of π bonds and σ bonds in the following structure is (a) 6, 19 (b) 4, 20 (c) 5, 19 (d) 5, 20

The commercial name of polyacrylonitrile is ........... (a) dacron (b) orlon (acrilan) (c) PVC (d) bakelite

Niobium crystallises in body - centred cubic structure. If density is 8.55 g cm−3. Calculate atomic radius of niobium using its atomic mass 93 u.

What is demulsification ? Name two demulsifiers ?

Which of the following compound has the highest dipole moment?

If 5 moles of CaCl2 is mixed with 2 moles of Na3PO4 the maximum number of moles of Ca3(PO4)2 formed will be: CaCl2+Na3PO4→Ca3(PO4)2+NaCl

The half - life of a radioactive element is 30 min. The time interval between the stages of 33.3% and 67.7% decay will be ?

Statement I: Neutron to proton ratio less than 1 especially in a heavy nucleus makes it highly unstable. Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.

Which best describes the product of the following reaction?

For 109% labeled oleum if the number of moles of H2SO4 and free SO3 be x and y respectively,then what will be the value of x+yx−y?

X and Y are two compounds of elements A and Cl. Molar mass and mass % of Cl are given in the table below. CompoundMolar mass% of ClX13777.5Y20885.1 Thus, X and Y are:

How many resonating structures are possible for the given molecule?

Cis isomer have:

Rate of change of weight near the earth's surface varies with height h (h&lt;&lt;R where R is the radius of the Earth) as

Which phenomenon is not shown by alkenes?

The conversion of PbO2 to Pb(NO3)2 is

The solubilities of carbonates decreases down the magnesium group due to a decrease in

The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 7 g of salt in 100 g of water at 100∘C is 70%. The vapour pressure of solution is:

What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution:

Iodoform can be prepared from all, except

Calculate the number of formula units of Na2SO4 in 49 millimoles of a pure sample of Na2SO4.

The vapour pressure of pure water at 1000c is 760mm of Hg while that of dilute solution of urea is 740mm of Hg. Then mass of urea present in 7.60g water is

Total number of isomers considering both structural and stereoisomers, of cyclic ethers with the molecular formula C4H8O is:

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed to obtain 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

A compound is reacted according to the reaction sequence given below to give product 'A'. Identify 'A':

Which conformation of C6H6CI6 is most powerful insecticide

Choose the corect order of atomic radii of fluorine and neon (in pm ) out of the options given below and justify your answer. (a) 72, 160 (b) 160, 160 (c) 72, 7 (d) 160, 72

The reaction: is called:

Ether is more volatile than alcohol having same molecular formula. This is due to:

Which reaction shows oxidizing nature of sulphuric acid:

Oxidation of toluene with CrO3 to benzaldehyde is carried out in the presence of acetic anhydride. Explain why.

The correct order in which the first ionization enthalpy increases is

From: SF4,BrF3,XeF2,IF5,SbF−4.SF−5,SeF+3,CH+3,PCl+4, the total number of planar species is/are:

Rate of change of weight near the earth's surface varies with height h (h<<R where R is the radius of the Earth) as