10223 + Interview Questions in Chemistry Page 24 InterviewSolution

1151.	During the recharging of lead acid storage cell the reaction at anode is(1) Pb^{2+}→ Pb(2) Pb^{2+}→ Pb^{4+}(3) Pb→ Pb^{2+}(4) Pb^{4+}Pb^2
Answer» During the recharging of lead acid storage cell the reaction at anode is(1) Pb^{2+}→ Pb(2) Pb^{2+}→ Pb^{4+}(3) Pb→ Pb^{2+}(4) Pb^{4+}Pb^2

Discussion

1152.	Rutherford's proved that atoms have ___.
Answer» Rutherford's proved that atoms have ___.

Discussion

1153.	In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.
Answer» In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.

Discussion

1154.	Define soil and discuss the factors responsible for its formation? [5 MARKS]
Answer» Define soil and discuss the factors responsible for its formation? [5 MARKS]

Discussion

1155.	Peroxy acids of sulphur among the following are:H2S2O8,H2SO5,H2S2O7,H2S2O3
Answer» Peroxy acids of sulphur among the following are: $H_{2} S_{2} O_{8}, H_{2} S O_{5}, H_{2} S_{2} O_{7}, H_{2} S_{2} O_{3}$

Discussion

1156.	A crystal is made by using particles X, Y and Z particle. Particle Z forms CCP.X occupies all the tetrahedral voids and Y occupies all the octahedral voids. If all the C-3 axis of symmetry are removed, then what will be the formula of solid?
Answer» A crystal is made by using particles X, Y and Z particle. Particle Z forms CCP.X occupies all the tetrahedral voids and Y occupies all the octahedral voids. If all the C-3 axis of symmetry are removed, then what will be the formula of solid?

Discussion

1157.	Question 36 A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. (a) Write the chemical formulae of X and Y. (b) Write a balanced chemical equation, when X is dissolved in water.
Answer» Question 36 A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. (a) Write the chemical formulae of X and Y. (b) Write a balanced chemical equation, when X is dissolved in water.

1157.

Question 36 A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. (a) Write the chemical formulae of X and Y. (b) Write a balanced chemical equation, when X is dissolved in water.

Answer»

Question 36
A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.

(a) Write the chemical formulae of X and Y.

(b) Write a balanced chemical equation, when X is dissolved in water.

Discussion

1158.	Which of the following are physical changes and which are chemical changes ? Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper
Answer» Which of the following are physical changes and which are chemical changes ? Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper

1158.

Which of the following are physical changes and which are chemical changes ? Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper

Answer»

Which of the following are physical changes and which are chemical changes ?

Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper

Discussion

1159.	how to identify homogenous and heterogenous mixture when dont know practically
Answer» how to identify homogenous and heterogenous mixture when dont know practically

Discussion

1160.	The particle not present in an ordinary hydrogen atom is:
Answer» The particle not present in an ordinary hydrogen atom is:

Discussion

1161.	36. The carbonate of metal X is a white solid. It decompose when heated to form carbon dioxide and yellow solid oxide. What is metal X?
Answer» 36. The carbonate of metal X is a white solid. It decompose when heated to form carbon dioxide and yellow solid oxide. What is metal X?

Discussion

1162.	Which of the following symbols of elements are incorrect? Give their correct symbols(a) Cobalt CO(b) Carbon c(c) Aluminium AL(d) Helium He(e) Sodium So
Answer» Which of the following symbols of elements are incorrect? Give their correct symbols (a) Cobalt CO (b) Carbon c (c) Aluminium AL (d) Helium He (e) Sodium So

Discussion

1163.	69.A nucleus ruptures into 2 nuclear parts, which have their velocity ratio equal to 2:1. The ratio of their respective nuclear sizs (nuclear radii) is
Answer» 69.A nucleus ruptures into 2 nuclear parts, which have their velocity ratio equal to 2:1. The ratio of their respective nuclear sizs (nuclear radii) is

Discussion

1164.	Why do camphor go under sublimation?Why do only some matter go under tHis process?
Answer» Why do camphor go under sublimation?Why do only some matter go under tHis process?

Discussion

1165.	During electrolysis of H2SO4, (aq) with high charge density. H2S2O8s is formed as by product. In such electrolysis, 44.8 L H2(g) and 15 L O2(g) liberated at STP. Hence, the moles of H2S2O8 is formed isapproximately equal to
Answer» During electrolysis of H2SO4, (aq) with high charge density. H2S2O8s is formed as by product. In such electrolysis, 44.8 L H2(g) and 15 L O2(g) liberated at STP. Hence, the moles of H2S2O8 is formed isapproximately equal to

Discussion

1166.	The white of an egg, common salt, sugar and fine sand are added to water separately in beakers as shown below. The mixture is stirred well. A suspension will be formed in the beaker :(1) I(2) II(3) III(4) (IV)
Answer» The white of an egg, common salt, sugar and fine sand are added to water separately in beakers as shown below. The mixture is stirred well. A suspension will be formed in the beaker : (1) I (2) II (3) III (4) (IV)

Discussion

1167.	88.The temperature at which the surface tension of water is zero (1) 370^° C (2) 0^° C (3) Slightly less than 647 K (4) 277 K
Answer» 88.The temperature at which the surface tension of water is zero (1) 370^° C (2) 0^° C (3) Slightly less than 647 K (4) 277 K

Discussion

1168.	Calculate the number of moles of atoms present in 56g of nitrogen gas?(If it is written nitrogen gas it should be N2 )
Answer» Calculate the number of moles of atoms present in 56g of nitrogen gas? (If it is written nitrogen gas it should be N2 )

Discussion

1169.	(a) What is an atom ? How do atoms usually exist? (b) What is a molecule? Explain with an example. (c) What is the difference between the molecule of an element and the molecule of a compound ? Give an example of each.
Answer» (a) What is an atom ? How do atoms usually exist? (b) What is a molecule? Explain with an example. (c) What is the difference between the molecule of an element and the molecule of a compound ? Give an example of each.

1169.

(a) What is an atom ? How do atoms usually exist? (b) What is a molecule? Explain with an example. (c) What is the difference between the molecule of an element and the molecule of a compound ? Give an example of each.

Answer»

(a) What is an atom ? How do atoms usually exist?

(b) What is a molecule? Explain with an example.

(c) What is the difference between the molecule of an element and the molecule of a compound ? Give an example of each.

Discussion

1170.	An element has four isotopes, each differing by an atomic mass of 1. The ratio of their abundance from the lightest to heaviest isotope is 1:2:2:3, respectively. Determine the average atomic mass of the element, if the mass of the heaviest isotope is A.
Answer» An element has four isotopes, each differing by an atomic mass of 1. The ratio of their abundance from the lightest to heaviest isotope is 1:2:2:3, respectively. Determine the average atomic mass of the element, if the mass of the heaviest isotope is A.

Discussion

1171.	What is the physical state of water at:1. 257°C2. 100°C3. 0°C
Answer» What is the physical state of water at: 1. 257°C 2. 100°C 3. 0°C

1171.

What is the physical state of water at:1. 257°C2. 100°C3. 0°C

Answer»

What is the physical state of water at:

1. 257°C

2. 100°C

3. 0°C

Discussion

1172.	The state of matter made of negatively charged electrons and positively charged ions can be known as
Answer» The state of matter made of negatively charged electrons and positively charged ions can be known as

Discussion

1173.	If the aluminium salt of an anion X is Al2X3, what is the valency of X? What will be the formula of the magnesium salt of X?
Answer» If the aluminium salt of an anion X is $A l_{2} X_{3}$ , what is the valency of X? What will be the formula of the magnesium salt of X?

Discussion

1174.	What is Brownian Motion?
Answer» What is Brownian Motion?

Discussion

1175.	What is ion ?
Answer» What is ion ?

Discussion

1176.	22.0.1M of NaCl solution 500ml is electrolysed for 1000sec by passing 9.65amphere current. Calculate volume of gasses liberated at STP and final concentration of Na+ and Cl- in solution also calculate final pH
Answer» 22.0.1M of NaCl solution 500ml is electrolysed for 1000sec by passing 9.65amphere current. Calculate volume of gasses liberated at STP and final concentration of Na+ and Cl- in solution also calculate final pH

Discussion

1177.	64.2 liq. A & B form ideal solution. A solution obtained by mixing 1 mol of A & 2mol of B has vapour pressure of 550 mm Hg if 1 mol of each A & B are added to the above solution the vapour pressure increases by 10 mm Hg. Calculate vapour pressure of pure A & B.
Answer» 64.2 liq. A & B form ideal solution. A solution obtained by mixing 1 mol of A & 2mol of B has vapour pressure of 550 mm Hg if 1 mol of each A & B are added to the above solution the vapour pressure increases by 10 mm Hg. Calculate vapour pressure of pure A & B.

Discussion

1178.	B(OH)3+NaOH⇌NaBO2+Na[B(OH)4]−+H2O How can the reaction above be made to proceed in the forward reaction?
Answer» $B (O H)_{3} + N a O H ⇌ N a B O_{2} + N a [B (O H)_{4}]^{-} + H_{2} O$ How can the reaction above be made to proceed in the forward reaction?

1178.

B(OH)3+NaOH⇌NaBO2+Na[B(OH)4]−+H2O How can the reaction above be made to proceed in the forward reaction?

Answer»

$B (O H)_{3} + N a O H ⇌ N a B O_{2} + N a [B (O H)_{4}]^{-} + H_{2} O$

How can the reaction above be made to proceed in the forward reaction?

Discussion

1179.	Calculate ΔG° for conversion of Oxygen to Ozone 3/2O₂ → O₃ at 298K, if Kp for this conversion is 2.47x10⁻²⁹
Answer» Calculate ΔG° for conversion of Oxygen to Ozone 3/2O₂ → O₃ at 298K, if Kp for this conversion is 2.47x10⁻²⁹

Discussion

1180.	The following element is a member of _____ group of the periodic table.
Answer» The following element is a member of _____ group of the periodic table.

1180.

The following element is a member of _____ group of the periodic table.

Answer»

The following element is a member of _____ group of the periodic table.

Discussion

1181.	Question 2 (ii)Write down the names of compounds represented by the following formulae:(ii) CaCl2
Answer» Question 2 (ii) Write down the names of compounds represented by the following formulae: $(i i) C a C l_{2}$

Discussion

1182.	What is the equivalent weight of Na2CO3 ?
Answer» What is the equivalent weight of Na2CO3 ?

Discussion

1183.	Calculate the number of aluminium ions present in 0.051 g of aluminium oxide (Al2O3). (Atomic masses: Al = 27 u; O = 16 u)
Answer» Calculate the number of aluminium ions present in 0.051 g of aluminium oxide (Al₂O₃). (Atomic masses: Al = 27 u; O = 16 u)

Discussion

1184.	The rms speed of the molecules of enclosed gas is V. what will be the rms speed if pressureis doubled keeping the temperature same
Answer» The rms speed of the molecules of enclosed gas is V. what will be the rms speed if pressureis doubled keeping the temperature same

Discussion

1185.	How does effect of temperature i.e. on increasing the temperature solubility decreases. Similarly, on increasing pressure solubility increases. Explain.
Answer» How does effect of temperature i.e. on increasing the temperature solubility decreases. Similarly, on increasing pressure solubility increases. Explain.

Discussion

1186.	How to calculate relative molecular mass?
Answer» How to calculate relative molecular mass?

Discussion

1187.	How many atoms are there in a sulphate ion. __
Answer» How many atoms are there in a sulphate ion. __

Discussion

1188.	What is the mass of 10 moles of H2O?
Answer» What is the mass of 10 moles of $H_{2} O$ ?

Discussion

1189.	Which of the following is not correct in mass flow hypothesis?
Answer» Which of the following is not correct in mass flow hypothesis?

Discussion

1190.	Lewis dot structure of carbon monoxide
Answer» Lewis dot structure of carbon monoxide

Discussion

1191.	in electromagnetic force electric formula is f=kq1q2 by r square.k is porpotionally constant , what is q
Answer» in electromagnetic force electric formula is f=kq1q2 by r square.k is porpotionally constant , what is q

Discussion

1192.	A solid whose volume does not change with temperature floats in a liquid. For two different temperature t1 and t2 of the liquid, fractions f1 and f2 of the volume of the solid remain submerged in the liquid. The coefficientof volume expamsion of the liquid is equal to ___________
Answer» A solid whose volume does not change with temperature floats in a liquid. For two different temperature t1 and t2 of the liquid, fractions f1 and f2 of the volume of the solid remain submerged in the liquid. The coefficientof volume expamsion of the liquid is equal to ___________

Discussion

1193.	Question 1(c) Classify the changes involved in the following processes as physical or chemical changes: Burning of coal
Answer» Question 1(c) Classify the changes involved in the following processes as physical or chemical changes: Burning of coal

Discussion

1194.	8. Simplest way to calculate valency of compounds?
Answer» 8. Simplest way to calculate valency of compounds?

Discussion

1195.	the formal charge present on sulphur atom i SO4
Answer» the formal charge present on sulphur atom i SO4

Discussion

1196.	Explain what you understand from the following diagram:
Answer» Explain what you understand from the following diagram:

1196.

Explain what you understand from the following diagram:

Answer»

Explain what you understand from the following diagram:

Discussion

1197.	ntThe radii of the two columns in U tube are r1 and r2.When a liquid of density d (angle of contact is 0') is filled in it the level difference of liquid in two arms is h.What will be the surface tension of liquid ?n
Answer» ntThe radii of the two columns in U tube are r1 and r2.When a liquid of density d (angle of contact is 0') is filled in it the level difference of liquid in two arms is h.What will be the surface tension of liquid ?n

Discussion

1198.	A neutral atom has an atomic mass of 12 and has 6 neutrons. Find how many electrons, protons and shells are present in this atom.
Answer» A neutral atom has an atomic mass of 12 and has 6 neutrons. Find how many electrons, protons and shells are present in this atom.

Discussion

1199.	The general equation for the combustion of ammonia is :
Answer» The general equation for the combustion of ammonia is :

Discussion

1200.	20 mL of a 20 M HCl solution is diluted to 2 L. What is the final normality of HCl solution?
Answer» $20 m L$ of a $20 M$ $H C l$ solution is diluted to $2 L$ . What is the final normality of $H C l$ solution?

Discussion

Explore topic-wise InterviewSolutions in .

During the recharging of lead acid storage cell the reaction at anode is(1) Pb^{2+}→ Pb(2) Pb^{2+}→ Pb^{4+}(3) Pb→ Pb^{2+}(4) Pb^{4+}Pb^2

Rutherford's proved that atoms have ___.

In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.

Define soil and discuss the factors responsible for its formation? [5 MARKS]

Peroxy acids of sulphur among the following are:H2S2O8,H2SO5,H2S2O7,H2S2O3

A crystal is made by using particles X, Y and Z particle. Particle Z forms CCP.X occupies all the tetrahedral voids and Y occupies all the octahedral voids. If all the C-3 axis of symmetry are removed, then what will be the formula of solid?

Which of the following are physical changes and which are chemical changes ? Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper

how to identify homogenous and heterogenous mixture when dont know practically

The particle not present in an ordinary hydrogen atom is:

36. The carbonate of metal X is a white solid. It decompose when heated to form carbon dioxide and yellow solid oxide. What is metal X?

Which of the following symbols of elements are incorrect? Give their correct symbols(a) Cobalt CO(b) Carbon c(c) Aluminium AL(d) Helium He(e) Sodium So

69.A nucleus ruptures into 2 nuclear parts, which have their velocity ratio equal to 2:1. The ratio of their respective nuclear sizs (nuclear radii) is

Why do camphor go under sublimation?Why do only some matter go under tHis process?

During electrolysis of H2SO4, (aq) with high charge density. H2S2O8s is formed as by product. In such electrolysis, 44.8 L H2(g) and 15 L O2(g) liberated at STP. Hence, the moles of H2S2O8 is formed isapproximately equal to

The white of an egg, common salt, sugar and fine sand are added to water separately in beakers as shown below. The mixture is stirred well. A suspension will be formed in the beaker :(1) I(2) II(3) III(4) (IV)

88.The temperature at which the surface tension of water is zero (1) 370^° C (2) 0^° C (3) Slightly less than 647 K (4) 277 K

Calculate the number of moles of atoms present in 56g of nitrogen gas?(If it is written nitrogen gas it should be N2 )

(a) What is an atom ? How do atoms usually exist? (b) What is a molecule? Explain with an example. (c) What is the difference between the molecule of an element and the molecule of a compound ? Give an example of each.

An element has four isotopes, each differing by an atomic mass of 1. The ratio of their abundance from the lightest to heaviest isotope is 1:2:2:3, respectively. Determine the average atomic mass of the element, if the mass of the heaviest isotope is A.

What is the physical state of water at:1. 257°C2. 100°C3. 0°C

The state of matter made of negatively charged electrons and positively charged ions can be known as

If the aluminium salt of an anion X is Al2X3, what is the valency of X? What will be the formula of the magnesium salt of X?

What is Brownian Motion?

What is ion ?

22.0.1M of NaCl solution 500ml is electrolysed for 1000sec by passing 9.65amphere current. Calculate volume of gasses liberated at STP and final concentration of Na+ and Cl- in solution also calculate final pH

64.2 liq. A & B form ideal solution. A solution obtained by mixing 1 mol of A & 2mol of B has vapour pressure of 550 mm Hg if 1 mol of each A & B are added to the above solution the vapour pressure increases by 10 mm Hg. Calculate vapour pressure of pure A & B.

B(OH)3+NaOH⇌NaBO2+Na[B(OH)4]−+H2O How can the reaction above be made to proceed in the forward reaction?

Calculate ΔG° for conversion of Oxygen to Ozone 3/2O₂ → O₃ at 298K, if Kp for this conversion is 2.47x10⁻²⁹

The following element is a member of _____ group of the periodic table.

Question 2 (ii)Write down the names of compounds represented by the following formulae:(ii) CaCl2

What is the equivalent weight of Na2CO3 ?

Calculate the number of aluminium ions present in 0.051 g of aluminium oxide (Al2O3). (Atomic masses: Al = 27 u; O = 16 u)

The rms speed of the molecules of enclosed gas is V. what will be the rms speed if pressureis doubled keeping the temperature same

How does effect of temperature i.e. on increasing the temperature solubility decreases. Similarly, on increasing pressure solubility increases. Explain.

How to calculate relative molecular mass?

How many atoms are there in a sulphate ion. __

What is the mass of 10 moles of H2O?

Which of the following is not correct in mass flow hypothesis?

Lewis dot structure of carbon monoxide

in electromagnetic force electric formula is f=kq1q2 by r square.k is porpotionally constant , what is q

A solid whose volume does not change with temperature floats in a liquid. For two different temperature t1 and t2 of the liquid, fractions f1 and f2 of the volume of the solid remain submerged in the liquid. The coefficientof volume expamsion of the liquid is equal to ___________

Question 1(c) Classify the changes involved in the following processes as physical or chemical changes: Burning of coal

8. Simplest way to calculate valency of compounds?

the formal charge present on sulphur atom i SO4

Explain what you understand from the following diagram:

ntThe radii of the two columns in U tube are r1 and r2.When a liquid of density d (angle of contact is 0') is filled in it the level difference of liquid in two arms is h.What will be the surface tension of liquid ?n

A neutral atom has an atomic mass of 12 and has 6 neutrons. Find how many electrons, protons and shells are present in this atom.

The general equation for the combustion of ammonia is :

20 mL of a 20 M HCl solution is diluted to 2 L. What is the final normality of HCl solution?