7248 + Interview Questions in Chemistry Page 17 InterviewSolution

801.	2Fe2O3.3H2O(s)Calcination−−−−−−−→A+6H2O(l)Find out A:
Answer» $2 {Fe}_{2} O_{3} . 3 H_{2} O(s) C a l c i n a t i o n - ------ \to A + 6 H_{2} O(l)$ Find out $A$ :

Discussion

802.	Why is gold used for making jewellery?
Answer» Why is gold used for making jewellery?

Discussion

803.	Which of the following are common sources of air pollution?
Answer» Which of the following are common sources of air pollution?

Discussion

804.	we know that atomic mass=no. of proton +no. of neutron. Chlorine has 17 proton and 18 neutron.But atomic mass of Chlorine is 35.5 why?
Answer» we know that atomic mass=no. of proton +no. of neutron. Chlorine has 17 proton and 18 neutron.But atomic mass of Chlorine is 35.5 why?

Discussion

805.	Question 6 (b)Give two reasons to justifyb. An iron almirah is a solid at room temperature.
Answer» Question 6 (b) Give two reasons to justify b. An iron almirah is a solid at room temperature.

Discussion

806.	Question 4Define the following gases. Coal gas Water-gas Biogas
Answer» Question 4 Define the following gases. Coal gas Water-gas Biogas

806.

Question 4Define the following gases. Coal gas Water-gas Biogas

Answer»

Question 4

Define the following gases.

Coal gas

Water-gas

Biogas

Discussion

807.	Electricity generated from fossil fuels such as coal and crude oil to run the industries leads to high concentrations of harmful gases in the atmosphere. This causes ozone layer depletion and global warming. What do coal and oil have in it that releases as oxides into the atmosphere?
Answer» Electricity generated from fossil fuels such as coal and crude oil to run the industries leads to high concentrations of harmful gases in the atmosphere. This causes ozone layer depletion and global warming. What do coal and oil have in it that releases as oxides into the atmosphere?

Discussion

808.	Why do goldsmith blow the outermost zone of the flame?
Answer» Why do goldsmith blow the outermost zone of the flame?

Discussion

809.	8.What is the ground state electronic configuration of a Co(Z=27) atom in the gas phase ?
Answer» 8.What is the ground state electronic configuration of a Co(Z=27) atom in the gas phase ?

Discussion

810.	What are the problems caused by the non-biodegradable wastes that we generate?
Answer» What are the problems caused by the non-biodegradable wastes that we generate?

Discussion

811.	(a) What is corrosion? What is the name given to the corrosion of articles made up of iron?(b) State the conditions in which corrosion of iron can take place.
Answer» (a) What is corrosion? What is the name given to the corrosion of articles made up of iron? (b) State the conditions in which corrosion of iron can take place.

811.

(a) What is corrosion? What is the name given to the corrosion of articles made up of iron?(b) State the conditions in which corrosion of iron can take place.

Answer»

(a) What is corrosion? What is the name given to the corrosion of articles made up of iron?

(b) State the conditions in which corrosion of iron can take place.

Discussion

812.	Which of the following cannot displace Ag from AgNO3 solution?
Answer» Which of the following cannot displace Ag from AgNO₃ solution?

812.

Which of the following cannot displace Ag from AgNO3 solution?

Answer»

Which of the following cannot displace Ag from AgNO₃ solution?

Discussion

813.	Which of the following was not an observation made during alpha particle scattering experiment?
Answer» Which of the following was not an observation made during alpha particle scattering experiment?

Discussion

814.	Petrochemicals are:
Answer» Petrochemicals are:

Discussion

815.	What is rapid combustion and spontaneous combustion?
Answer» What is rapid combustion and spontaneous combustion?

Discussion

816.	State whether the following statement is True or False: Sulphur is an element, air is a compound and steam is a mixture.
Answer» State whether the following statement is True or False: Sulphur is an element, air is a compound and steam is a mixture.

Discussion

817.	If PCl5 is 80% dissociated at 250 degree Celsius then it's vapor density at room temperature will be
Answer» If PCl5 is 80% dissociated at 250 degree Celsius then it's vapor density at room temperature will be

Discussion

818.	Give reasons:(a) Metals like Na, K, Ca and Mg are never found in their free state in nature.(b) Iron loses its lustre over time whereas gold does not.
Answer» Give reasons: (a) Metals like $Na, K, Ca$ and $Mg$ are never found in their free state in nature. (b) Iron loses its lustre over time whereas gold does not.

Discussion

819.	The pressure exerted by the gas is because of ____
Answer» The pressure exerted by the gas is because of ____

Discussion

820.	Which of the following cases shows work done is non-zero?
Answer» Which of the following cases shows work done is non-zero?

Discussion

821.	Question 6The most suitable material for the preparation of handles of cooking utensils is(a) Polythene(b) PVC(c) Nylon(d) Bakelite
Answer» Question 6 The most suitable material for the preparation of handles of cooking utensils is (a) Polythene (b) PVC (c) Nylon (d) Bakelite

Discussion

822.	If saturated vapours are compressed slowly at cons†an t temperature to one fourth the initial volume, the vapour pressure will
Answer» If saturated vapours are compressed slowly at cons†an t temperature to one fourth the initial volume, the vapour pressure will

Discussion

823.	From where particles in a matter gain kinetic energy
Answer» From where particles in a matter gain kinetic energy

Discussion

824.	If the mixture of oil and water is allowed to settle for a while. What will be our final observation?
Answer» If the mixture of oil and water is allowed to settle for a while. What will be our final observation?

Discussion

825.	The standard enthalpies of combustion of fumaric acid and maleic acid are -1336.0 kJ mol^{-1} and1359.2 kJ/mol, respectively. What will be theenthalpy of the given isomerisation process?
Answer» The standard enthalpies of combustion of fumaric acid and maleic acid are -1336.0 kJ mol^{-1} and1359.2 kJ/mol, respectively. What will be theenthalpy of the given isomerisation process?

Discussion

826.	An element X forms an oxide XO3, the valency of element X is:
Answer» An element X forms an oxide $X O_{3}$ , the valency of element X is:

Discussion

827.	Which among the following statement(s) is(are) correct for the given redox reaction: Pb3O4+8HClHeat−−−→3PbCl2+Cl2+4H2O I. HCl is oxidised II. HCl is reduced III. Pb3O4 is reduced IV. Pb3O4 is oxidised
Answer» Which among the following statement(s) is(are) correct for the given redox reaction: $P b_{3} O_{4} + 8 H C l H e a t - -- \to 3 P b C l_{2} + C l_{2} + 4 H_{2} O$ I. $H C l$ is oxidised II. $H C l$ is reduced III. $P b_{3} O_{4}$ is reduced IV. $P b_{3} O_{4}$ is oxidised

Discussion

828.	Question 45.A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.
Answer» Question 45. A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.

Discussion

829.	Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.
Answer» Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.

Discussion

830.	A chemical equation which has 4 reactants
Answer» A chemical equation which has 4 reactants

Discussion

831.	Can a solid turn into gas?
Answer» Can a solid turn into gas?

Discussion

832.	For reaction: A + B → Products, the rate if the reaction at various concentration are given below: Expt. No.(A)(B)Rate10.20.2220.20.4430.60.436
Answer» For reaction: A + B $\to$ Products, the rate if the reaction at various concentration are given below: $\begin{matrix} Expt. No. & (A) & (B) & Rate 1 & 0.2 & 0.2 & 2 2 & 0.2 & 0.4 & 4 3 & 0.6 & 0.4 & 36 \end{matrix}$

832.

For reaction: A + B → Products, the rate if the reaction at various concentration are given below: Expt. No.(A)(B)Rate10.20.2220.20.4430.60.436

Answer»

For reaction: A + B $\to$ Products, the rate if the reaction at various concentration are given below:

$\begin{matrix} Expt. No. & (A) & (B) & Rate 1 & 0.2 & 0.2 & 2 2 & 0.2 & 0.4 & 4 3 & 0.6 & 0.4 & 36 \end{matrix}$

Discussion

833.	Name any four places in India where petroleum is found.
Answer» Name any four places in India where petroleum is found.

Discussion

834.	13.A: When a solution is seperated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. R: Diffusion of solvent occurs from a region of high concentration solution to a region of low concerntration solution.
Answer» 13.A: When a solution is seperated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. R: Diffusion of solvent occurs from a region of high concentration solution to a region of low concerntration solution.

Discussion

835.	Why should we use fossil fuels only when absolutely necessary ?
Answer» Why should we use fossil fuels only when absolutely necessary ?

Discussion

836.	(a) State five characteristics of metals and five characteristics of non-metals. (b) State five uses of metals and five uses of non-metals.
Answer» (a) State five characteristics of metals and five characteristics of non-metals. (b) State five uses of metals and five uses of non-metals.

836.

(a) State five characteristics of metals and five characteristics of non-metals. (b) State five uses of metals and five uses of non-metals.

Answer»

(a) State five characteristics of metals and five characteristics of non-metals.

(b) State five uses of metals and five uses of non-metals.

Discussion

837.	Identify the true and false statement(s). Statement I: Liquid mixtures like milk and blood can be called solutions. Statement II: The solvents in a solution are always in a liquid state
Answer» Identify the true and false statement(s). Statement I: Liquid mixtures like milk and blood can be called solutions. Statement II: The solvents in a solution are always in a liquid state

Discussion

838.	An example of reaction in which precipitate is formed is:
Answer» An example of reaction in which precipitate is formed is:

Discussion

839.	What is a polymer? Name the natural polymer of which cotton is made.
Answer» What is a polymer? Name the natural polymer of which cotton is made.

Discussion

840.	can cathode rays produce X rays when they strike the metal foil?
Answer» can cathode rays produce X rays when they strike the metal foil?

Discussion

841.	What is Oxidizing and reducing agent
Answer» What is Oxidizing and reducing agent

Discussion

842.	Why flame alway burn vertically upward, why it not burn down by gravity. explain.
Answer» Why flame alway burn vertically upward, why it not burn down by gravity. explain.

Discussion

843.	Name two gases that are mainly responsible for acid rain?
Answer» Name two gases that are mainly responsible for acid rain?

Discussion

844.	Which among the following is correctly represented?
Answer» Which among the following is correctly represented?

Discussion

845.	What is the difference between Volatile and non-Volatile impurities?
Answer» What is the difference between Volatile and non-Volatile impurities?

Discussion

846.	State the ways of reducing the presence of green house gases.
Answer» State the ways of reducing the presence of green house gases.

Discussion

847.	The metals are obtained from their oxides form by:
Answer» The metals are obtained from their oxides form by:

Discussion

848.	What is the work done by the field of a nucleus in pi/5 of circular orbit of the electron and what if the orbit is elliptical?
Answer» What is the work done by the field of a nucleus in pi/5 of circular orbit of the electron and what if the orbit is elliptical?

Discussion

849.	At Critical Temperature,pressure and volume . The compressibility Factor (Z) Is
Answer» At Critical Temperature,pressure and volume . The compressibility Factor (Z) Is

Discussion

850.	There were plenty of dolphin had been seen in the river Ganges but now very few are left. This is beacause: [3 MARKS]
Answer» There were plenty of dolphin had been seen in the river Ganges but now very few are left. This is beacause: [3 MARKS]

Discussion

Explore topic-wise InterviewSolutions in .

2Fe2O3.3H2O(s)Calcination−−−−−−−→A+6H2O(l)Find out A:

Why is gold used for making jewellery?

Which of the following are common sources of air pollution?

we know that atomic mass=no. of proton +no. of neutron. Chlorine has 17 proton and 18 neutron.But atomic mass of Chlorine is 35.5 why?

Question 6 (b)Give two reasons to justifyb. An iron almirah is a solid at room temperature.

Question 4Define the following gases. Coal gas Water-gas Biogas

Electricity generated from fossil fuels such as coal and crude oil to run the industries leads to high concentrations of harmful gases in the atmosphere. This causes ozone layer depletion and global warming. What do coal and oil have in it that releases as oxides into the atmosphere?

Why do goldsmith blow the outermost zone of the flame?

8.What is the ground state electronic configuration of a Co(Z=27) atom in the gas phase ?

What are the problems caused by the non-biodegradable wastes that we generate?​

(a) What is corrosion? What is the name given to the corrosion of articles made up of iron?(b) State the conditions in which corrosion of iron can take place.

Which of the following cannot displace Ag from AgNO3 solution?

Which of the following was not an observation made during alpha particle scattering experiment?

Petrochemicals are:

What is rapid combustion and spontaneous combustion?

State whether the following statement is True or False: Sulphur is an element, air is a compound and steam is a mixture.

If PCl5 is 80% dissociated at 250 degree Celsius then it's vapor density at room temperature will be

Give reasons:(a) Metals like Na, K, Ca and Mg are never found in their free state in nature.(b) Iron loses its lustre over time whereas gold does not.

The pressure exerted by the gas is because of ____

Which of the following cases shows work done is non-zero?

Question 6The most suitable material for the preparation of handles of cooking utensils is(a) Polythene(b) PVC(c) Nylon(d) Bakelite

If saturated vapours are compressed slowly at cons†an t temperature to one fourth the initial volume, the vapour pressure will

From where particles in a matter gain kinetic energy

If the mixture of oil and water is allowed to settle for a while. What will be our final observation?

The standard enthalpies of combustion of fumaric acid and maleic acid are -1336.0 kJ mol^{-1} and1359.2 kJ/mol, respectively. What will be theenthalpy of the given isomerisation process?

An element X forms an oxide XO3, the valency of element X is:

Which among the following statement(s) is(are) correct for the given redox reaction: Pb3O4+8HClHeat−−−→3PbCl2+Cl2+4H2O I. HCl is oxidised II. HCl is reduced III. Pb3O4 is reduced IV. Pb3O4 is oxidised

Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.

A chemical equation which has 4 reactants

Can a solid turn into gas?

For reaction: A + B → Products, the rate if the reaction at various concentration are given below: Expt. No.(A)(B)Rate10.20.2220.20.4430.60.436

Name any four places in India where petroleum is found.

13.A: When a solution is seperated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. R: Diffusion of solvent occurs from a region of high concentration solution to a region of low concerntration solution.

Why should we use fossil fuels only when absolutely necessary ?

(a) State five characteristics of metals and five characteristics of non-metals. (b) State five uses of metals and five uses of non-metals.

Identify the true and false statement(s). Statement I: Liquid mixtures like milk and blood can be called solutions. Statement II: The solvents in a solution are always in a liquid state

An example of reaction in which precipitate is formed is:

What is a polymer? Name the natural polymer of which cotton is made.

can cathode rays produce X rays when they strike the metal foil?

What is Oxidizing and reducing agent

Why flame alway burn vertically upward, why it not burn down by gravity. explain.

Name two gases that are mainly responsible for acid rain?​

Which among the following is correctly represented?

What is the difference between Volatile and non-Volatile impurities?

State the ways of reducing the presence of green house gases.

The metals are obtained from their oxides form by:

What is the work done by the field of a nucleus in pi/5 of circular orbit of the electron and what if the orbit is elliptical?

At Critical Temperature,pressure and volume . The compressibility Factor (Z) Is

There were plenty of dolphin had been seen in the river Ganges but now very few are left. This is beacause: [3 MARKS]

What are the problems caused by the non-biodegradable wastes that we generate?

Name two gases that are mainly responsible for acid rain?