15280 + Interview Questions in Chemistry Page 251 InterviewSolution

12501.	In the Ostwald's process, 95% ammonia is converted to nitric oxide (NO). The remaining 5% is burnt into __________ .
Answer» In the Ostwald's process, 95% ammonia is converted to nitric oxide (NO). The remaining 5% is burnt into __________ .

12501.

In the Ostwald's process, 95% ammonia is converted to nitric oxide (NO). The remaining 5% is burnt into __________ .

Answer»

In the Ostwald's process, 95% ammonia is converted to nitric oxide (NO).

The remaining 5% is burnt into __________ .

12502.	Explain why the following statements are not correct: [4 MARKS] (a) Nitrogen can be obtained in the pure state by removing CO2 and O2 from air. (b) Ammonium salts, on heating, give ammonia.
Answer» Explain why the following statements are not correct: [4 MARKS] (a) Nitrogen can be obtained in the pure state by removing $C O_{2}$ and $O_{2}$ from air. (b) Ammonium salts, on heating, give ammonia.

Discussion

12503.	The process of separation of different constituents of petroleum is known as ___ of petroleum.
Answer» The process of separation of different constituents of petroleum is known as ___ of petroleum.

Discussion

12504.	Question 9 In the modern periodic table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Answer» Question 9 In the modern periodic table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?

Discussion

12505.	The ionic compound Ca(OH)2 on dissociation will give cation X. The charge on this on cation is ___.
Answer» The ionic compound $C a (O H)_{2}$ on dissociation will give cation X. The charge on this on cation is ___.

Discussion

12506.	Question 5 How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?
Answer» Question 5 How is the concentration of hydronium ions $(H_{3} O^{+})$ affected when a solution of an acid is diluted?

Discussion

12507.	Which of the following is the laboratory preparation of dihydrogen?
Answer» Which of the following is the laboratory preparation of dihydrogen?

Discussion

12508.	(a) What is the number of valence electrons in the atoms of first element in a period ? (b) What is the usual number of valence electrons in the atoms of the last element in a period ?
Answer» (a) What is the number of valence electrons in the atoms of first element in a period ? (b) What is the usual number of valence electrons in the atoms of the last element in a period ?

12508.

(a) What is the number of valence electrons in the atoms of first element in a period ? (b) What is the usual number of valence electrons in the atoms of the last element in a period ?

Answer»

(a) What is the number of valence electrons in the atoms of first element in a period ?

(b) What is the usual number of valence electrons in the atoms of the last element in a period ?

Discussion

12509.	Arrange the following in a food chain: Fish, Algae, Small animals, Big Fish
Answer» Arrange the following in a food chain: Fish, Algae, Small animals, Big Fish

Discussion

12510.	Complete the reaction Na2S+2HCl→2NaCl+ ______
Answer» Complete the reaction $N a_{2} S + 2 H C l \to 2 N a C l +$ ______

12510.

Complete the reaction Na2S+2HCl→2NaCl+ ______

Answer»

Complete the reaction

$N a_{2} S + 2 H C l \to 2 N a C l +$ ______

Discussion

12511.	Calculate the percentage composition of chlorine in HCl(Atomic mass of Hydrogen=1 and chlorine=35.5)
Answer» Calculate the percentage composition of chlorine in HCl(Atomic mass of Hydrogen=1 and chlorine=35.5)

Discussion

12512.	Identify the type of reaction in the following examples : (i) Na2SO4(aq)+BaCl2(aq)→BaSO4(s)+2NaCl(aq) (ii) Fe(s)+CuSO4(aq)→FeSO4(aq)+Cu(s) (iii) 2H2(g)+O2(g)→2H2O(l)
Answer» Identify the type of reaction in the following examples : (i) $N a_{2} S O_{4} (a q) + B a C l_{2} (a q) \to B a S O_{4} (s) + 2 N a C l (a q)$ (ii) $F e (s) + C u S O_{4} (a q) \to F e S O_{4} (a q) + C u (s)$ (iii) $2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l)$

Discussion

12513.	What is the reason for the formation of polar covalent bond in HCl?
Answer» What is the reason for the formation of polar covalent bond in HCl?

Discussion

12514.	Lattice energy of alkali metal chlorides follow the order:
Answer» Lattice energy of alkali metal chlorides follow the order:

Discussion

12515.	Which of the following metals largely exist in their combined state?
Answer» Which of the following metals largely exist in their combined state?

Discussion

12516.	Question 5 Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is/are correct? (i) In beakers A and B, an exothermic process has occurred. (ii) In beakers A and B, an endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred. (a) (i) only (b) (ii) only (c) (i) and (iv) (d) (ii) and (iii)
Answer» Question 5 Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of $NaOH$ , anhydrous ${CuSO}_{4}$ and $NaCl$ were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is/are correct? (i) In beakers A and B, an exothermic process has occurred. (ii) In beakers A and B, an endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred. (a) (i) only (b) (ii) only (c) (i) and (iv) (d) (ii) and (iii)

Discussion

12517.	In which of the following sets, elements have nearly same atomic radii?
Answer» In which of the following sets, elements have nearly same atomic radii?

Discussion

12518.	If a hydrocarbon contains 3 carbons, then how many different arrangements of carbon skeletons are possible?
Answer» If a hydrocarbon contains 3 carbons, then how many different arrangements of carbon skeletons are possible?

Discussion

12519.	A reaction takes place in three steps. The rate constant of the three steps are k1,k2 and k3 respectively. The overall rate constant k=k1k3k2. The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:
Answer» A reaction takes place in three steps. The rate constant of the three steps are $k_{1}, k_{2}$ and $k_{3}$ respectively. The overall rate constant $k = \frac{k_{1} k_{3}}{k_{2}} .$ The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:

Discussion

12520.	A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X, Y and Z respectively are
Answer» A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X, Y and Z respectively are

Discussion

12521.	Why are concentrated ores are converted into corresponding Oxides before reduction
Answer» Why are concentrated ores are converted into corresponding Oxides before reduction

Discussion

12522.	Triads of elements arranged in increasing order of their atomic masses were proposed by-
Answer» Triads of elements arranged in increasing order of their atomic masses were proposed by-

Discussion

12523.	Name the three types of decomposition reaction and give one example for each.
Answer» Name the three types of decomposition reaction and give one example for each.

Discussion

12524.	what is the role of the Decomposer in an environment explained in brief
Answer» what is the role of the Decomposer in an environment explained in brief

Discussion

12525.	No gas is evolved when :
Answer» No gas is evolved when :

Discussion

12526.	Write a shirt not on anodising thermit process
Answer» Write a shirt not on anodising thermit process

12526.

Write a shirt not on anodising thermit process

Answer»

Write a shirt not on

anodising

thermit process

Discussion

12527.	What no. Of atoms sulphur molecule consist? Why?
Answer» What no. Of atoms sulphur molecule consist? Why?

Discussion

12528.	What is called exothermic and endothermic reaction?
Answer» What is called exothermic and endothermic reaction?

Discussion

12529.	Is tin acidic or basic in nature?
Answer» Is tin acidic or basic in nature?

Discussion

12530.	What happens when sodium sulphites react with dilute hydrochloric acid?
Answer» What happens when sodium sulphites react with dilute hydrochloric acid?

Discussion

12531.	Which of the following statements regarding carbon dioxide are true?
Answer» Which of the following statements regarding carbon dioxide are true?

Discussion

12532.	(a) What happens when methane reacts with chlorine? Give the equation of the reaction which takes place. (b) What is hydrogenation? What is its industrial application? (c) Give any two difference between soaps and detergents.
Answer» (a) What happens when methane reacts with chlorine? Give the equation of the reaction which takes place. (b) What is hydrogenation? What is its industrial application? (c) Give any two difference between soaps and detergents.

Discussion

12533.	If one mole of carbon atoms weighs 12 grams, what is the mass (in gram) of 1 atom of carbon? [3 MARKS]
Answer» If one mole of carbon atoms weighs 12 grams, what is the mass (in gram) of 1 atom of carbon? [3 MARKS]

Discussion

12534.	Which one of the following statements does not hold true for magnesium chloride?
Answer» Which one of the following statements does not hold true for magnesium chloride?

Discussion

12535.	The fuel used for welding metals is a mixture of:
Answer» The fuel used for welding metals is a mixture of:

Discussion

12536.	Which of the following electrolytes is used in Downs' process of extracting sodium metal?
Answer» Which of the following electrolytes is used in Downs' process of extracting sodium metal?

Discussion

12537.	The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106). Questions based on the production of 21.2 g of sodium carbonate. To produce 33.6g of sodium hydrogen carbonate what volume of carbon dioxide, measured at STP, would be required?
Answer» The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na₂CO₃ = 106). Questions based on the production of 21.2 g of sodium carbonate. To produce 33.6g of sodium hydrogen carbonate what volume of carbon dioxide, measured at STP, would be required?

12537.

The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106). Questions based on the production of 21.2 g of sodium carbonate. To produce 33.6g of sodium hydrogen carbonate what volume of carbon dioxide, measured at STP, would be required?

Answer»

The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na₂CO₃ = 106).

Questions based on the production of 21.2 g of sodium carbonate.

To produce 33.6g of sodium hydrogen carbonate what volume of carbon dioxide, measured at STP, would be required?

Discussion

12538.	The molecular velocities of two gases at same temperature are u1 and u2, their molar masses are m1 and m2 respectively. Which of the following expression is correct?
Answer» The molecular velocities of two gases at same temperature are $u_{1}$ and $u_{2}$ , their molar masses are $m_{1}$ and $m_{2}$ respectively. Which of the following expression is correct?

Discussion

12539.	How will you distinguish lead carbonate and zinc carbonate in solution ?
Answer» How will you distinguish lead carbonate and zinc carbonate in solution ?

Discussion

12540.	Waht is the mass of 56cm3 fo carbon monoxide at STP? \([C = 12; O = 16]\|)
Answer» Waht is the mass of $56 c m^{3}$ fo carbon monoxide at STP? \([C = 12; O = 16]\|)

Discussion

12541.	Explain why : (a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor. (b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air. (c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene : (i) has no effect on litmus, and (ii) does not conduct electricity. (d) thick white fumes are formed when a glass rod dipped in NH4OH is brought near the mouth of a bottle full of HCl gas. (e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water. (f) hydrogen chloride gas is not collected over water.
Answer» Explain why : (a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor. (b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air. (c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene : (i) has no effect on litmus, and (ii) does not conduct electricity. (d) thick white fumes are formed when a glass rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas. (e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water. (f) hydrogen chloride gas is not collected over water.

12541.

Explain why : (a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor. (b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air. (c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene : (i) has no effect on litmus, and (ii) does not conduct electricity. (d) thick white fumes are formed when a glass rod dipped in NH4OH is brought near the mouth of a bottle full of HCl gas. (e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water. (f) hydrogen chloride gas is not collected over water.

Answer»

Explain why :

(a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor.
(b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air.
(c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene :
(i) has no effect on litmus, and
(ii) does not conduct electricity.
(d) thick white fumes are formed when a glass rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas.
(e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.

(f) hydrogen chloride gas is not collected over water.

Discussion

12542.	What is the purpose of the salt bridge?
Answer» What is the purpose of the salt bridge?

Discussion

12543.	Which among the following elements has the tendency to form covalent compounds?
Answer» Which among the following elements has the tendency to form covalent compounds?

Discussion

12544.	Which of the given options has free electrons and can conduct electricity?
Answer» Which of the given options has free electrons and can conduct electricity?

Discussion

12545.	The atomic mass of Oxygen is 16 u. Considering the above statement, which among the following options can be inferred?
Answer» The atomic mass of Oxygen is 16 u. Considering the above statement, which among the following options can be inferred?

12545.

The atomic mass of Oxygen is 16 u. Considering the above statement, which among the following options can be inferred?

Answer»

The atomic mass of Oxygen is 16 u.

Considering the above statement, which among the following options can be inferred?

Discussion

12546.	Explain in detail: All methods of Extraction of Aluminum From Bauxite.
Answer» Explain in detail: All methods of Extraction of Aluminum From Bauxite.

12546.

Explain in detail: All methods of Extraction of Aluminum From Bauxite.

Answer»

Explain in detail:

All methods of Extraction of Aluminum From Bauxite.

Discussion

12547.	Write a short note on pH. [3 MARKS]
Answer» Write a short note on pH. [3 MARKS]

Discussion

12548.	Metals are said to be shiny. Why do metals generally appear to be dull? How can their brightness be restored?
Answer» Metals are said to be shiny. Why do metals generally appear to be dull? How can their brightness be restored?

Discussion

12549.	How many carbon atoms are there in TNT (Trinitrotoluene) compound?
Answer» How many carbon atoms are there in TNT (Trinitrotoluene) compound?

Discussion

12550.	Expand the following abbreviations: (a) ADP (b) PGA (c) PGAL
Answer» Expand the following abbreviations: (a) ADP (b) PGA (c) PGAL

Discussion

Explore topic-wise InterviewSolutions in .

In the Ostwald's process, 95% ammonia is converted to nitric oxide (NO). The remaining 5% is burnt into __________ .

Explain why the following statements are not correct: [4 MARKS] (a) Nitrogen can be obtained in the pure state by removing CO2 and O2 from air. (b) Ammonium salts, on heating, give ammonia.

The process of separation of different constituents of petroleum is known as ___ of petroleum.

Question 9 In the modern periodic table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?

The ionic compound Ca(OH)2 on dissociation will give cation X. The charge on this on cation is ___.

Question 5 How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

Which of the following is the laboratory preparation of dihydrogen?

(a) What is the number of valence electrons in the atoms of first element in a period ? (b) What is the usual number of valence electrons in the atoms of the last element in a period ?

Arrange the following in a food chain: Fish, Algae, Small animals, Big Fish

Complete the reaction Na2S+2HCl→2NaCl+ ______

Calculate the percentage composition of chlorine in HCl(Atomic mass of Hydrogen=1 and chlorine=35.5)

Identify the type of reaction in the following examples : (i) Na2SO4(aq)+BaCl2(aq)→BaSO4(s)+2NaCl(aq) (ii) Fe(s)+CuSO4(aq)→FeSO4(aq)+Cu(s) (iii) 2H2(g)+O2(g)→2H2O(l)

What is the reason for the formation of polar covalent bond in HCl?

Lattice energy of alkali metal chlorides follow the order:

Which of the following metals largely exist in their combined state?

In which of the following sets, elements have nearly same atomic radii?

If a hydrocarbon contains 3 carbons, then how many different arrangements of carbon skeletons are possible?

A reaction takes place in three steps. The rate constant of the three steps are k1,k2 and k3 respectively. The overall rate constant k=k1k3k2. The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:

Why are concentrated ores are converted into corresponding Oxides before reduction

Triads of elements arranged in increasing order of their atomic masses were proposed by-

Name the three types of decomposition reaction and give one example for each.

what is the role of the Decomposer in an environment explained in brief

No gas is evolved when :

Write a shirt not on anodising thermit process

What no. Of atoms sulphur molecule consist? Why?

What is called exothermic and endothermic reaction?

Is tin acidic or basic in nature?

What happens when sodium sulphites react with dilute hydrochloric acid?

Which of the following statements regarding carbon dioxide are true?

(a) What happens when methane reacts with chlorine? Give the equation of the reaction which takes place. (b) What is hydrogenation? What is its industrial application? (c) Give any two difference between soaps and detergents.

If one mole of carbon atoms weighs 12 grams, what is the mass (in gram) of 1 atom of carbon? [3 MARKS]

Which one of the following statements does not hold true for magnesium chloride?

The fuel used for welding metals is a mixture of:

Which of the following electrolytes is used in Downs' process of extracting sodium metal?

The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106). Questions based on the production of 21.2 g of sodium carbonate. To produce 33.6g of sodium hydrogen carbonate what volume of carbon dioxide, measured at STP, would be required?

The molecular velocities of two gases at same temperature are u1 and u2, their molar masses are m1 and m2 respectively. Which of the following expression is correct?

How will you distinguish lead carbonate and zinc carbonate in solution ?

Waht is the mass of 56cm3 fo carbon monoxide at STP? \([C = 12; O = 16]|)

What is the purpose of the salt bridge?

Which among the following elements has the tendency to form covalent compounds?

Which of the given options has free electrons and can conduct electricity?

The atomic mass of Oxygen is 16 u. Considering the above statement, which among the following options can be inferred?

Explain in detail: All methods of Extraction of Aluminum From Bauxite.

Write a short note on pH. [3 MARKS]

Metals are said to be shiny. Why do metals generally appear to be dull? How can their brightness be restored?

How many carbon atoms are there in TNT (Trinitrotoluene) compound?

Expand the following abbreviations: (a) ADP (b) PGA (c) PGAL