15280 + Interview Questions in Chemistry Page 205 InterviewSolution

10201.	Choose the correct option:
Answer» Choose the correct option:

Discussion

10202.	The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]
Answer» The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]

Discussion

10203.	Atomic mass = ______
Answer» Atomic mass = ______

Discussion

10204.	Which of the below elements will most likely form a Covalent Bond?
Answer» Which of the below elements will most likely form a Covalent Bond?

Discussion

10205.	What is meant by bioconcentration of pesticides? Which common pesticide has accumulated in the human body in considerable amounts?
Answer» What is meant by bioconcentration of pesticides? Which common pesticide has accumulated in the human body in considerable amounts?

Discussion

10206.	How does a biodegradable waste differ from a non-biodegradable waste? Give two examples of non-biodegradable wastes which pollute our environment.
Answer» How does a biodegradable waste differ from a non-biodegradable waste? Give two examples of non-biodegradable wastes which pollute our environment.

Discussion

10207.	What is a neutralisation reaction ? Explain with an example. Give the chemical equation of the reaction which takes place.
Answer» What is a neutralisation reaction ? Explain with an example. Give the chemical equation of the reaction which takes place.

Discussion

10208.	How ions are different from electrons
Answer» How ions are different from electrons

Discussion

10209.	Which of the following statments is incorrect?
Answer» Which of the following statments is incorrect?

Discussion

10210.	The rate of a reaction is calculated by using the formula
Answer» The rate of a reaction is calculated by using the formula

Discussion

10211.	In LiF, the structure of F− is
Answer» In LiF, the structure of $F^{-}$ is

Discussion

10212.	Metallurgy is a process of extracting:
Answer» Metallurgy is a process of extracting:

Discussion

10213.	Name: (a) the processes involved in (i) concentration (ii) refining of ores. (b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.
Answer» Name: (a) the processes involved in (i) concentration (ii) refining of ores. (b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

10213.

Name: (a) the processes involved in (i) concentration (ii) refining of ores. (b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Answer»

Name:

(a) the processes involved in

(i) concentration (ii) refining of ores.

(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Discussion

10214.	Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)
Answer» Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)

10214.

Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)

Answer»

Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)

Discussion

10215.	A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to 3.8×10−5 torr at 00 C. The number of molecules of the gas remaining in the tube is
Answer» A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to $3.8 \times 10^{- 5}$ torr at $0^{0} C$ . The number of molecules of the gas remaining in the tube is

Discussion

10216.	Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]
Answer» Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]

Discussion

10217.	Identify the oxidising agent in the given chemical reaction. 2Fe2O3 (s)+3C (s)→4Fe (s)+3CO2(g)
Answer» Identify the oxidising agent in the given chemical reaction. $2 {Fe}_{2} O_{3} (s) + 3 C (s) \to 4 Fe (s) + 3 {CO}_{2} (g)$

Discussion

10218.	The IUPAC name of the given compound is
Answer» The IUPAC name of the given compound is

10218.

The IUPAC name of the given compound is

Answer»

The IUPAC name of the given compound is

Discussion

10219.	Four test tubes marked I, II, III and IV were taken. A piece of zinc metal was placed in test tube I, an iron nail was put in test tube II, copper turnings were put in test tube III and a clean aluminium strip was placed in test tube IV. 20 ml of Al2(SO4)3 solution in water was poured in each of the test tubes. No change was observed in any of the test tubes. The correct inference drawn is : (a) Copper is more reactive than Aluminium. (b) Zinc is more reactive than Aluminium. (c) Zinc is more reactive than Copper. (d) Zinc, Iron and Copper are less reactive than Aluminium.
Answer» Four test tubes marked I, II, III and IV were taken. A piece of zinc metal was placed in test tube I, an iron nail was put in test tube II, copper turnings were put in test tube III and a clean aluminium strip was placed in test tube IV. 20 ml of $A l_{2} (S O_{4})_{3}$ solution in water was poured in each of the test tubes. No change was observed in any of the test tubes. The correct inference drawn is : (a) Copper is more reactive than Aluminium. (b) Zinc is more reactive than Aluminium. (c) Zinc is more reactive than Copper. (d) Zinc, Iron and Copper are less reactive than Aluminium.

Discussion

10220.	Question 29. Show the dilute aqueous solution of hydrochloric acid (a) H3O++Cl− (b) H3O++OH− (c) Cl−+OH− (d) unionised HCl
Answer» Question 29. Show the dilute aqueous solution of hydrochloric acid (a) $H_{3} O^{+} + {Cl}^{-}$ (b) $H_{3} O^{+} + {OH}^{-}$ (c) ${Cl}^{-} + {OH}^{-}$ (d) unionised HCl

Discussion

10221.	MgO reacts with water to form
Answer» $MgO$ reacts with water to form

Discussion

10222.	Corrosion is ________ type of reaction.
Answer» Corrosion is ________ type of reaction.

Discussion

10223.	The atomic number of an elelment X is 19. The number of electrons in its ion X' will be: (a) 18 (b) 19 (c) 20 (d) 21
Answer» The atomic number of an elelment X is 19. The number of electrons in its ion X' will be: (a) 18 (b) 19 (c) 20 (d) 21

Discussion

10224.	Which of the following expressions about the electrolysis of a salt solution is correct ? m = mass of substance deposited;Q=electricity in coulombs;M=molar mass z = valence ; F = faraday
Answer» Which of the following expressions about the electrolysis of a salt solution is correct ? m = mass of substance deposited;Q=electricity in coulombs;M=molar mass z = valence ; F = faraday

Discussion

10225.	How many of the following metallic ores are concentrated by magnetic seperation method? cassiterite, pyrolusite, rutile, magnetite, galena, cinnabar, chloroapatite, wolframite, chromite, zinc blende
Answer» How many of the following metallic ores are concentrated by magnetic seperation method? cassiterite, pyrolusite, rutile, magnetite, galena, cinnabar, chloroapatite, wolframite, chromite, zinc blende

Discussion

10226.	(a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which reaction between them will not take place. Write the balanced chemical equation for the reaction and also mention the type of reaction. (b) What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails in copper sulphate solution for about half an hour ?
Answer» (a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which reaction between them will not take place. Write the balanced chemical equation for the reaction and also mention the type of reaction. (b) What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails in copper sulphate solution for about half an hour ?

Discussion

10227.	Question 21. Which of the following is used for dissolution of gold ? (a) Hydrochloric acid (b) Sulphuric acid (c) Nitric acid (d) Aqua regia
Answer» Question 21. Which of the following is used for dissolution of gold ? (a) Hydrochloric acid (b) Sulphuric acid (c) Nitric acid (d) Aqua regia

Discussion

10228.	Which of the following is the chemical formula for methanol?
Answer» Which of the following is the chemical formula for methanol?

Discussion

10229.	(a) What is a salt ? Give the names and formulae of any two salts. Also, name the acids and bases from which these salts may be obtained. (b) What is meant by 'a family of salts of salts'? Explain with examples. (c) What is meant by 'hydrated' and 'anhydrous' salts? Explain with examples. (d) Write the names, formulae and colours of any two hydrated salts. (e) What will be the colour of litmus in an aqueous solution of ammonium chloride salt?
Answer» (a) What is a salt ? Give the names and formulae of any two salts. Also, name the acids and bases from which these salts may be obtained. (b) What is meant by 'a family of salts of salts'? Explain with examples. (c) What is meant by 'hydrated' and 'anhydrous' salts? Explain with examples. (d) Write the names, formulae and colours of any two hydrated salts. (e) What will be the colour of litmus in an aqueous solution of ammonium chloride salt?

10229.

(a) What is a salt ? Give the names and formulae of any two salts. Also, name the acids and bases from which these salts may be obtained. (b) What is meant by 'a family of salts of salts'? Explain with examples. (c) What is meant by 'hydrated' and 'anhydrous' salts? Explain with examples. (d) Write the names, formulae and colours of any two hydrated salts. (e) What will be the colour of litmus in an aqueous solution of ammonium chloride salt?

Answer»

(a) What is a salt ? Give the names and formulae of any two salts. Also, name the acids and bases from which these salts may be obtained.

(b) What is meant by 'a family of salts of salts'? Explain with examples.

(c) What is meant by 'hydrated' and 'anhydrous' salts? Explain with examples.

(d) Write the names, formulae and colours of any two hydrated salts.

(e) What will be the colour of litmus in an aqueous solution of ammonium chloride salt?

Discussion

10230.	What is the color of copper sulphate crystals?
Answer» What is the color of copper sulphate crystals?

Discussion

10231.	(a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write the chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.
Answer» (a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write the chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

Discussion

10232.	10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4 . What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]
Answer» 10g of Fe powder was mixed with a $C u S O_{4}$ solution which contained 70g of $C u S O_{4}$ . What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

10232.

10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4 . What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

Answer»

10g of Fe powder was mixed with a $C u S O_{4}$ solution which contained 70g of $C u S O_{4}$ . What is the weight of the copper obtained?

[Fe = 55.85g Cu = 63.6g]

Discussion

10233.	What are ionic bonds , covalent bonds and polar covalent bonds?
Answer» What are ionic bonds , covalent bonds and polar covalent bonds?

Discussion

10234.	How does nail polish remover wipes the polish form our nails
Answer» How does nail polish remover wipes the polish form our nails

Discussion

10235.	If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy ? Lemon juice, Vinegar, Baking soda solution Give reason for your choice.
Answer» If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy ? Lemon juice, Vinegar, Baking soda solution Give reason for your choice.

10235.

If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy ? Lemon juice, Vinegar, Baking soda solution Give reason for your choice.

Answer»

If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy ?

Lemon juice, Vinegar, Baking soda solution

Give reason for your choice.

Discussion

10236.	What happens when mercurous nitrate is treated with hydrochloric acid?
Answer» What happens when mercurous nitrate is treated with hydrochloric acid?

Discussion

10237.	Across a period, the electrons are filled in the __ valence shell of all elements.
Answer» Across a period, the electrons are filled in the __ valence shell of all elements.

Discussion

10238.	Three moles of an ideal monoatomic gas is initially in the state A shown in the adjoining pressure-temperature graph. It is taken to state B without changing its pressure. If R is the universal gas constant, the work done by the gas in this process is
Answer» Three moles of an ideal monoatomic gas is initially in the state A shown in the adjoining pressure-temperature graph. It is taken to state B without changing its pressure. If R is the universal gas constant, the work done by the gas in this process is

Discussion

10239.	Why do halogens show a high tendency to make compounds with alkali metals and alkali earth metals
Answer» Why do halogens show a high tendency to make compounds with alkali metals and alkali earth metals

Discussion

10240.	How do indicators actually change color
Answer» How do indicators actually change color

Discussion

10241.	Identify A and B in the following reaction. CH3CH2OH+O2→A+B+Heat and light
Answer» Identify A and B in the following reaction. $C H_{3} C H_{2} O H + O_{2} \to A + B + H e a t a n d l i g h t$

Discussion

10242.	The cash book shows a bank balance of Rs. 7,800. On comparing the cash book with Passbook, the following discrepancies were noted (i) Cheque deposited in the bank but not credited, Rs. 3,000. (ii) Cheque issued but not yet presented for payment, Rs. 1,500. (iii) Insurance premium paid by the bank, Rs. 2,000. (iv) Bank interest credit by the bank, Rs. 400. (v) Bank charges, Rs. 100. (vi) Directly deposited by a customer, Rs. 4,000.
Answer» The cash book shows a bank balance of Rs. 7,800. On comparing the cash book with Passbook, the following discrepancies were noted (i) Cheque deposited in the bank but not credited, Rs. 3,000. (ii) Cheque issued but not yet presented for payment, Rs. 1,500. (iii) Insurance premium paid by the bank, Rs. 2,000. (iv) Bank interest credit by the bank, Rs. 400. (v) Bank charges, Rs. 100. (vi) Directly deposited by a customer, Rs. 4,000.

10242.

The cash book shows a bank balance of Rs. 7,800. On comparing the cash book with Passbook, the following discrepancies were noted (i) Cheque deposited in the bank but not credited, Rs. 3,000. (ii) Cheque issued but not yet presented for payment, Rs. 1,500. (iii) Insurance premium paid by the bank, Rs. 2,000. (iv) Bank interest credit by the bank, Rs. 400. (v) Bank charges, Rs. 100. (vi) Directly deposited by a customer, Rs. 4,000.

Answer»

The cash book shows a bank balance of Rs. 7,800. On comparing the cash book with Passbook, the following discrepancies were noted

(i) Cheque deposited in the bank but not credited, Rs. 3,000.

(ii) Cheque issued but not yet presented for payment, Rs. 1,500.

(iii) Insurance premium paid by the bank, Rs. 2,000.

(iv) Bank interest credit by the bank, Rs. 400.

(v) Bank charges, Rs. 100.

(vi) Directly deposited by a customer, Rs. 4,000.

Discussion

10243.	What is the total number of Inert elements of the modern periodic table?
Answer» What is the total number of Inert elements of the modern periodic table?

Discussion

10244.	On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively, the colours developed in the solutions are marked in the following figures: What is the correct decreasing order of pH values of the solutions.
Answer» On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively, the colours developed in the solutions are marked in the following figures: What is the correct decreasing order of pH values of the solutions.

10244.

On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively, the colours developed in the solutions are marked in the following figures: What is the correct decreasing order of pH values of the solutions.

Answer»

On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively, the colours developed in the solutions are marked in the following figures:

What is the correct decreasing order of pH values of the solutions.

Discussion

10245.	The products obtained after the combustion of methane are:
Answer» The products obtained after the combustion of methane are:

Discussion

10246.	X+HCl→ZnCl2+H2O+CO2 Find X and balance the equation.
Answer» $X + H C l \to Z n C l_{2} + H_{2} O + C O_{2}$ Find X and balance the equation.

10246.

X+HCl→ZnCl2+H2O+CO2 Find X and balance the equation.

Answer»

$X + H C l \to Z n C l_{2} + H_{2} O + C O_{2}$

Find X and balance the equation.

Discussion

10247.	At the top of a mountain a thermometer reads 7∘C and a barometer reads 70 cm of Hg. At the bottom of the mountain these read 27∘C and 76 cm of Hg respectively. Comparison of density of air at the top with that of bottom is
Answer» At the top of a mountain a thermometer reads $7^{\circ} C$ and a barometer reads 70 cm of Hg. At the bottom of the mountain these read $27^{\circ} C$ and 76 cm of Hg respectively. Comparison of density of air at the top with that of bottom is

10247.

At the top of a mountain a thermometer reads 7∘C and a barometer reads 70 cm of Hg. At the bottom of the mountain these read 27∘C and 76 cm of Hg respectively. Comparison of density of air at the top with that of bottom is

Answer»

At the top of a mountain a thermometer reads $7^{\circ} C$ and a barometer reads 70 cm of Hg. At the bottom of the mountain these read $27^{\circ} C$ and 76 cm of Hg respectively. Comparison of density of air at the top with that of bottom is

Discussion

10248.	Which of the following metals can be found in their pure form in nature?
Answer» Which of the following metals can be found in their pure form in nature?

Discussion

10249.	(a) Write balanced equations for the following: [3 MARKS] (i) Zinc and dilute hydrochloric acid. (ii) Calcium bicarbonate and dilute hydrochloric acid. (b) State what is observed when hydrochloric acid is added to silver nitrate solution.
Answer» (a) Write balanced equations for the following: [3 MARKS] (i) Zinc and dilute hydrochloric acid. (ii) Calcium bicarbonate and dilute hydrochloric acid. (b) State what is observed when hydrochloric acid is added to silver nitrate solution.

Discussion

10250.	Which element can be placed in the region marked by question mark ?
Answer» Which element can be placed in the region marked by question mark ?

Discussion

Explore topic-wise InterviewSolutions in .

Choose the correct option:

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]

Atomic mass = ______

Which of the below elements will most likely form a Covalent Bond?

What is meant by bioconcentration of pesticides? Which common pesticide has accumulated in the human body in considerable amounts?

How does a biodegradable waste differ from a non-biodegradable waste? Give two examples of non-biodegradable wastes which pollute our environment.

What is a neutralisation reaction ? Explain with an example. Give the chemical equation of the reaction which takes place.

How ions are different from electrons

Which of the following statments is incorrect?

The rate of a reaction is calculated by using the formula

In LiF, the structure of F− is

Metallurgy is a process of extracting:

Name: (a) the processes involved in (i) concentration (ii) refining of ores. (b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14)

A glass tube of volume 112 ml containing a gas is partially evacuated till the pressure in it drops to 3.8×10−5 torr at 00 C. The number of molecules of the gas remaining in the tube is

Greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]

Identify the oxidising agent in the given chemical reaction. 2Fe2O3 (s)+3C (s)→4Fe (s)+3CO2(g)

The IUPAC name of the given compound is

Question 29. Show the dilute aqueous solution of hydrochloric acid (a) H3O++Cl− (b) H3O++OH− (c) Cl−+OH− (d) unionised HCl

MgO reacts with water to form

Corrosion is ________ type of reaction.

The atomic number of an elelment X is 19. The number of electrons in its ion X' will be: (a) 18 (b) 19 (c) 20 (d) 21

Which of the following expressions about the electrolysis of a salt solution is correct ? m = mass of substance deposited;Q=electricity in coulombs;M=molar mass z = valence ; F = faraday

How many of the following metallic ores are concentrated by magnetic seperation method? cassiterite, pyrolusite, rutile, magnetite, galena, cinnabar, chloroapatite, wolframite, chromite, zinc blende

Question 21. Which of the following is used for dissolution of gold ? (a) Hydrochloric acid (b) Sulphuric acid (c) Nitric acid (d) Aqua regia

Which of the following is the chemical formula for methanol?

What is the color of copper sulphate crystals?

(a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write the chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4 . What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

What are ionic bonds , covalent bonds and polar covalent bonds?

How does nail polish remover wipes the polish form our nails

If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy ? Lemon juice, Vinegar, Baking soda solution Give reason for your choice.

What happens when mercurous nitrate is treated with hydrochloric acid?

Across a period, the electrons are filled in the __ valence shell of all elements.

Three moles of an ideal monoatomic gas is initially in the state A shown in the adjoining pressure-temperature graph. It is taken to state B without changing its pressure. If R is the universal gas constant, the work done by the gas in this process is

Why do halogens show a high tendency to make compounds with alkali metals and alkali earth metals

How do indicators actually change color

Identify A and B in the following reaction. CH3CH2OH+O2→A+B+Heat and light

What is the total number of Inert elements of the modern periodic table?

On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively, the colours developed in the solutions are marked in the following figures: What is the correct decreasing order of pH values of the solutions.

The products obtained after the combustion of methane are:

X+HCl→ZnCl2+H2O+CO2 Find X and balance the equation.

At the top of a mountain a thermometer reads 7∘C and a barometer reads 70 cm of Hg. At the bottom of the mountain these read 27∘C and 76 cm of Hg respectively. Comparison of density of air at the top with that of bottom is

Which of the following metals can be found in their pure form in nature?

(a) Write balanced equations for the following: [3 MARKS] (i) Zinc and dilute hydrochloric acid. (ii) Calcium bicarbonate and dilute hydrochloric acid. (b) State what is observed when hydrochloric acid is added to silver nitrate solution.

Which element can be placed in the region marked by question mark ?