15280 + Interview Questions in Chemistry

1.	Gallium is below aluminium in the periodic table but atomic radius of gallium is less than that of aluminium. It is due to
Answer» Gallium is below aluminium in the periodic table but atomic radius of gallium is less than that of aluminium. It is due to

Discussion

2.	27. Carbon found in nature as a mixture of C-12& C-13. The average atomic mass of carbon is 12.011amu. What is the percentage abundance of carbon-12 in nature
Answer» 27. Carbon found in nature as a mixture of C-12& C-13. The average atomic mass of carbon is 12.011amu. What is the percentage abundance of carbon-12 in nature

Discussion

3.	What is isomerism? Draw the Isomers of butane.
Answer» What is isomerism? Draw the Isomers of butane.

Discussion

4.	What is the lewis electron dot structure of HSO4-
Answer» What is the lewis electron dot structure of HSO4-

Discussion

5.	The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?
Answer» The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

5.

The second step in the production of sulphuric acid(contact process) is given by the equation: $2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$ Ideally, which conditions would increase the yield of this reaction?

Answer»

The second step in the production of sulphuric acid(contact process) is given by the equation:

$2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$

Ideally, which conditions would increase the yield of this reaction?

Discussion

6.	If ionic product of water is Ky 10-16 at 4^° C, thena solution with pH 7.5 at 4^° C will(1) Turn blue litmus red (2) Turn red litmus blue(3) Be neutral to litmus (4) Be alkaline
Answer» If ionic product of water is Ky 10-16 at 4^° C, thena solution with pH 7.5 at 4^° C will(1) Turn blue litmus red (2) Turn red litmus blue(3) Be neutral to litmus (4) Be alkaline

Discussion

7.	on the basis of 'law of consertvation of mass', find the amount of CO2 required to completly react with 56g of CaO, in order to produce 100g of CaCO3
Answer» on the basis of 'law of consertvation of mass', find the amount of CO2 required to completly react with 56g of CaO, in order to produce 100g of CaCO3

Discussion

8.	Given image is of a :
Answer» Given image is of a :

Discussion

9.	Describe the theory of manufacture of sulphuric acid by contact process, with all the necessary condition (No technical details are required but equations should be given for each stage of process).
Answer» Describe the theory of manufacture of sulphuric acid by contact process, with all the necessary condition (No technical details are required but equations should be given for each stage of process).

Discussion

10.	For the reaction:A(g)+B(g)→C(g)At STP, 150 g of gas A reacts with 56 L of gas B and produces gas C, which is diatomic. Calculate the number of atoms in C.(Molar mass of A = 60 g/mol, NA is Avogadro's number )
Answer» For the reaction: $A (g) + B (g) \to C (g)$ At STP, 150 g of gas $A$ reacts with 56 L of gas B and produces gas C, which is diatomic. Calculate the number of atoms in C. (Molar mass of A = 60 g/mol, $N_{A}$ is Avogadro's number )

Discussion

11.	What is the pH of 0.1M H2CO3 solution?(Given: Ka1,Ka2 respectively are 4 x 10^-3 and 9 x 10^-6)
Answer» What is the pH of 0.1M H2CO3 solution?(Given: Ka1,Ka2 respectively are 4 x 10^-3 and 9 x 10^-6)

Discussion

12.	how many moles of electrons weigh 1kg?
Answer» how many moles of electrons weigh 1kg?

Discussion

13.	We have the number of outer shell valence electrons of 4 atoms. Which among them will have the least electron affinity? Atom 1: 7 Atom 2: 2 Atom 3: 6 Atom 4: 3
Answer» We have the number of outer shell valence electrons of 4 atoms. Which among them will have the least electron affinity? Atom 1: 7 Atom 2: 2 Atom 3: 6 Atom 4: 3

Discussion

14.	43.Which of the following has highest boiling point? (A) Ethane (B)Benzyl alcohol (C)Propane 1,2,3-triol (D)2-methyl-propanol
Answer» 43.Which of the following has highest boiling point? (A) Ethane (B)Benzyl alcohol (C)Propane 1,2,3-triol (D)2-methyl-propanol

Discussion

15.	The following balances appeared in the books of A Ltd. On January 1, 2011 Items(Rs)12% Debentures4,00,000Debentures Redemption Fund3,60,000Debentures Redemption Fund Investment3,60,000Securities Premium30,000Bank Balance1,00,000 On January 1, 2011, the company redeemed all the debentures at 105% out of funds raised by selling all the investments at Rs. 3,48,000. Prepare the necessary ledger accounts.
Answer» The following balances appeared in the books of A Ltd. On January 1, 2011 $\begin{matrix} Items & (Rs) 12% Debentures & 4, 00, 000 Debentures Redemption Fund & 3, 60, 000 Debentures Redemption Fund Investment & 3, 60, 000 Securities Premium & 30, 000 Bank Balance & 1, 00, 000 \end{matrix}$ On January 1, 2011, the company redeemed all the debentures at 105% out of funds raised by selling all the investments at Rs. 3,48,000. Prepare the necessary ledger accounts.

Discussion

16.	In the P3−, S2−and Cl− ions, the increasing order of size is
Answer» In the $P^{3 -}, S^{2 -} and C l^{-}$ ions, the increasing order of size is

Discussion

17.	What element is mainly electroplated on car parts to give them a shiny appearance?
Answer» What element is mainly electroplated on car parts to give them a shiny appearance?

Discussion

18.	Total number of geometrical isomers for the complex[RhCl(CO)(PPh3)(NH3)] is
Answer» Total number of geometrical isomers for the complex $[R h C l (C O) (P P h_{3}) (N H_{3})]$ is

Discussion

19.	Which does not form double salt?1. Li2SO4 2. Na2SO4 3. K2SO4 4. Rb2SO4We know that the hydration enthalpy for Li is greater than it's lattice enthalpy , then why does Li2SO4 does not form a double salt ?
Answer» Which does not form double salt? 1. Li2SO4 2. Na2SO4 3. K2SO4 4. Rb2SO4 We know that the hydration enthalpy for Li is greater than it's lattice enthalpy , then why does Li2SO4 does not form a double salt ?

Discussion

20.	in an acidic solution I- changes to I2 how many gram of I2 aer produced if in the same process 1.5 *10^22electrons are used upto reduce AsO4^3- and AsO3^3-
Answer» in an acidic solution I- changes to I2 how many gram of I2 aer produced if in the same process 1.5 *10^22electrons are used upto reduce AsO4^3- and AsO3^3-

Discussion

21.	Number of C-H bonds in pro-1-yne are4
Answer» Number of C-H bonds in pro-1-yne are 4

Discussion

22.	77. Energy reqd for the ionisation of 0.02gm atom of mg is x KJ.the amount of energy reqd to ionise 1atom of mg is.
Answer» 77. Energy reqd for the ionisation of 0.02gm atom of mg is x KJ.the amount of energy reqd to ionise 1atom of mg is.

Discussion

23.	An element has an atomic number of 107. What is its electronic configuration and what will be its group number?
Answer» An element has an atomic number of 107. What is its electronic configuration and what will be its group number?

Discussion

24.	Burst the bubbles that contain an acidic oxide.
Answer» Burst the bubbles that contain an acidic oxide.

Discussion

25.	what is the ratio of empirical formula mass to molecular formula mass of benzen
Answer» what is the ratio of empirical formula mass to molecular formula mass of benzen

Discussion

26.	In an electrochemical cell, what are the carriers of current? electrons or ions, and how?
Answer» In an electrochemical cell, what are the carriers of current? electrons or ions, and how?

Discussion

27.	2. Licl is covalent compound why?
Answer» 2. Licl is covalent compound why?

Discussion

28.	When compound X is dissolved in water, it dissociate as shown below: X→A + OH− Here X is:
Answer» When compound X is dissolved in water, it dissociate as shown below: $X \to A$ + $O H^{-}$ Here X is:

28.

When compound X is dissolved in water, it dissociate as shown below: X→A + OH− Here X is:

Answer»

When compound X is dissolved in water, it dissociate as shown below:

$X \to A$ + $O H^{-}$

Here X is:

Discussion

29.	Burst the bubbles with unit fractions.
Answer» Burst the bubbles with unit fractions.

Discussion

30.	Identify this structure:
Answer» Identify this structure:

30.

Identify this structure:

Answer»

Identify this structure:

Discussion

31.	Which one of the following is correct order of the size of iodine species?
Answer» Which one of the following is correct order of the size of iodine species?

Discussion

32.	When NaHCO3 is heated, what is obtained?
Answer» When $N a H C O_{3}$ is heated, what is obtained?

Discussion

33.	37. The ionisation energy will be higher when electron is removed from which orbital, s, p, d or f? Why so? Also, the ionisation energy will be lowest when electron is removed from which orbital?
Answer» 37. The ionisation energy will be higher when electron is removed from which orbital, s, p, d or f? Why so? Also, the ionisation energy will be lowest when electron is removed from which orbital?

Discussion

34.	Define an acid.
Answer» Define an acid.

Discussion

35.	State the conditions for the oxidation of ammonia to nitrogen monoxide [nitric oxide], in the manufacture of nitric acid by Ostwald's process. Write the balanced equation for the reaction.
Answer» State the conditions for the oxidation of ammonia to nitrogen monoxide [nitric oxide], in the manufacture of nitric acid by Ostwald's process. Write the balanced equation for the reaction.

Discussion

36.	(i) Calculate the percentage of phosphorus in the fertilizer superphosphate Ca(H2PO4)2.(H = 1; O = 16; P = 31; Ca = 40)(ii) Write out and balance the following equation correctly:Ca3(PO4)2 + H2SO4 → Ca(H2PO4)2 + CaSO4(iii) Copy and complete the following sentence:Superphosphate is an example of a compound called___________(acid salt / basic salt / normal salt).
Answer» (i) Calculate the percentage of phosphorus in the fertilizer superphosphate Ca(H₂PO₄)₂. (H = 1; O = 16; P = 31; Ca = 40) (ii) Write out and balance the following equation correctly: Ca₃(PO₄)₂ + H₂SO₄ $\overset{}{\to}$ Ca(H₂PO₄)₂ + CaSO₄ (iii) Copy and complete the following sentence: Superphosphate is an example of a compound called___________(acid salt / basic salt / normal salt).

Discussion

37.	Why as a ionization energy of titanium is greater than the vanadium
Answer» Why as a ionization energy of titanium is greater than the vanadium

Discussion

38.	Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?
Answer» Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?

Discussion

39.

Copy and complete the following table. Column 3 has the names of gases to be prepared using the substance you enter in Column 1, alongwith dilute or concentrated sulphuric acid, as indicated in Column 2. Column 1 Column 2 Column 3 Substance reacted with acid Dilute or concentrated sulphuric acid Gas hydrogen carbon dioxide only chlorine Write the equation for the laboratory preparation of:(i) Sodium sulphate using dilute sulphuric acid.(ii) Lead sulphate using dilute sulphuric acid.

Answer»

Copy and complete the following table. Column 3 has the names of gases to be prepared using the substance you enter in Column 1, alongwith dilute or concentrated sulphuric acid, as indicated in Column 2.

Column 1	Column 2	Column 3
Substance reacted with acid	Dilute or concentrated sulphuric acid	Gas
		hydrogen
		carbon dioxide
		only chlorine

Write the equation for the laboratory preparation of:

(i) Sodium sulphate using dilute sulphuric acid.

(ii) Lead sulphate using dilute sulphuric acid.

Discussion

40.	Lewis structure of Li is:
Answer» Lewis structure of Li is:

Discussion

41.	To treat a first degree burn you should__________.
Answer» To treat a first degree burn you should__________.

Discussion

42.	4. which property of an element is most dependent on shielding effect? (1)atomic no. (2)atomic mass (3)atomic radius (4)no. of stable isotopes
Answer» 4. which property of an element is most dependent on shielding effect? (1)atomic no. (2)atomic mass (3)atomic radius (4)no. of stable isotopes

Discussion

43.	A COMPOUND CONTAIN 3.2% OF OXYGEN BY MASS THE MINIMUM MOLECULAR WEIGHT OF THE COMPOUND IS
Answer» A COMPOUND CONTAIN 3.2% OF OXYGEN BY MASS THE MINIMUM MOLECULAR WEIGHT OF THE COMPOUND IS

Discussion

44.	2.5 V is required for the following electrolytic reduction of Al2O3 at a high temperature:2 Al2O3 4 Al + 3 O2The Gibb’s energy for the decomposition of aluminium oxide at same temperature is+5211 kJ mol–1+2895 kJ mol–1+1960 kJ mol–1 +960 kJ mol–1
Answer» 2.5 V is required for the following electrolytic reduction of Al2O3 at a high temperature: 2 Al2O3 4 Al + 3 O2 The Gibb’s energy for the decomposition of aluminium oxide at same temperature is +5211 kJ mol–1 +2895 kJ mol–1 +1960 kJ mol–1 +960 kJ mol–1

Discussion

45.	15mL of water and 10mL of sulphuric acid are to be mixed in a beaker. (I) state the method that should be followed with reason. (II) what is the process called?
Answer» 15mL of water and 10mL of sulphuric acid are to be mixed in a beaker. (I) state the method that should be followed with reason. (II) what is the process called?

Discussion

46.	All metal react to magnet
Answer» All metal react to magnet

Discussion

47.	Metals react with oxygen in air to form _________.
Answer» Metals react with oxygen in air to form _________.

Discussion

48.	On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, Al, Zn, Pb, Fe)(a) which metal salt solution was used?(b) what is the formula of the white gelatinous precipitate obtained?
Answer» On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, Al, Zn, Pb, Fe) (a) which metal salt solution was used? (b) what is the formula of the white gelatinous precipitate obtained?

Discussion

49.	Which of the following has the lowest number of electrons in the valence shell?
Answer» Which of the following has the lowest number of electrons in the valence shell?

Discussion

50.

Question 110 (i) Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question : What is the charge on an atom?

Answer»

Question 110 (i)

Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question :
What is the charge on an atom?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Gallium is below aluminium in the periodic table but atomic radius of gallium is less than that of aluminium. It is due to

27. Carbon found in nature as a mixture of C-12& C-13. The average atomic mass of carbon is 12.011amu. What is the percentage abundance of carbon-12 in nature

What is isomerism? Draw the Isomers of butane.

What is the lewis electron dot structure of HSO4-

The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

If ionic product of water is Ky 10-16 at 4^° C, thena solution with pH 7.5 at 4^° C will(1) Turn blue litmus red (2) Turn red litmus blue(3) Be neutral to litmus (4) Be alkaline

on the basis of 'law of consertvation of mass', find the amount of CO2 required to completly react with 56g of CaO, in order to produce 100g of CaCO3

Given image is of a :

Describe the theory of manufacture of sulphuric acid by contact process, with all the necessary condition (No technical details are required but equations should be given for each stage of process).

For the reaction:A(g)+B(g)→C(g)At STP, 150 g of gas A reacts with 56 L of gas B and produces gas C, which is diatomic. Calculate the number of atoms in C.(Molar mass of A = 60 g/mol, NA is Avogadro's number )

What is the pH of 0.1M H2CO3 solution?(Given: Ka1,Ka2 respectively are 4 x 10^-3 and 9 x 10^-6)

how many moles of electrons weigh 1kg?

We have the number of outer shell valence electrons of 4 atoms. Which among them will have the least electron affinity? Atom 1: 7 Atom 2: 2 Atom 3: 6 Atom 4: 3

43.Which of the following has highest boiling point? (A) Ethane (B)Benzyl alcohol (C)Propane 1,2,3-triol (D)2-methyl-propanol

In the P3−, S2−and Cl− ions, the increasing order of size is

What element is mainly electroplated on car parts to give them a shiny appearance?

Total number of geometrical isomers for the complex[RhCl(CO)(PPh3)(NH3)] is

Which does not form double salt?1. Li2SO4 2. Na2SO4 3. K2SO4 4. Rb2SO4We know that the hydration enthalpy for Li is greater than it's lattice enthalpy , then why does Li2SO4 does not form a double salt ?

in an acidic solution I- changes to I2 how many gram of I2 aer produced if in the same process 1.5 *10^22electrons are used upto reduce AsO4^3- and AsO3^3-

Number of C-H bonds in pro-1-yne are4

77. Energy reqd for the ionisation of 0.02gm atom of mg is x KJ.the amount of energy reqd to ionise 1atom of mg is.

An element has an atomic number of 107. What is its electronic configuration and what will be its group number?

Burst the bubbles that contain an acidic oxide.

what is the ratio of empirical formula mass to molecular formula mass of benzen

In an electrochemical cell, what are the carriers of current? electrons or ions, and how?

2. Licl is covalent compound why?

When compound X is dissolved in water, it dissociate as shown below: X→A + OH− Here X is:

Burst the bubbles with unit fractions.

Identify this structure:

Which one of the following is correct order of the size of iodine species?

When NaHCO3 is heated, what is obtained?

37. The ionisation energy will be higher when electron is removed from which orbital, s, p, d or f? Why so? Also, the ionisation energy will be lowest when electron is removed from which orbital?

Define an acid.

State the conditions for the oxidation of ammonia to nitrogen monoxide [nitric oxide], in the manufacture of nitric acid by Ostwald's process. Write the balanced equation for the reaction.

Why as a ionization energy of titanium is greater than the vanadium

Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?

Lewis structure of Li is:

To treat a first degree burn you should__________.

4. which property of an element is most dependent on shielding effect? (1)atomic no. (2)atomic mass (3)atomic radius (4)no. of stable isotopes

A COMPOUND CONTAIN 3.2% OF OXYGEN BY MASS THE MINIMUM MOLECULAR WEIGHT OF THE COMPOUND IS

2.5 V is required for the following electrolytic reduction of Al2O3 at a high temperature:2 Al2O3 4 Al + 3 O2The Gibb’s energy for the decomposition of aluminium oxide at same temperature is+5211 kJ mol–1+2895 kJ mol–1+1960 kJ mol–1 +960 kJ mol–1

15mL of water and 10mL of sulphuric acid are to be mixed in a beaker. (I) state the method that should be followed with reason. (II) what is the process called?

All metal react to magnet

Metals react with oxygen in air to form _________.

Which of the following has the lowest number of electrons in the valence shell?