15280 + Interview Questions in Chemistry Page 221 InterviewSolution

11001.	Why does tooth decay start when the pH of mouth is lower than 5.5 ?
Answer» Why does tooth decay start when the pH of mouth is lower than 5.5 ?

Discussion

11002.	Why is copper hydroxide soluble in excess of ammonia solution and not soluble in excess of caustic potash?
Answer» Why is copper hydroxide soluble in excess of ammonia solution and not soluble in excess of caustic potash?

Discussion

11003.	(a) Give the name and structural formula of one member each of the following : (i) alkane (ii) alkene (iii) alkyne (iv) cycloalkane (b) What are the common names of (i) Ethyne (ii) Ethene (c) What is the chemical and structural formula of benzene?
Answer» (a) Give the name and structural formula of one member each of the following : (i) alkane (ii) alkene (iii) alkyne (iv) cycloalkane (b) What are the common names of (i) Ethyne (ii) Ethene (c) What is the chemical and structural formula of benzene?

11003.

(a) Give the name and structural formula of one member each of the following : (i) alkane (ii) alkene (iii) alkyne (iv) cycloalkane (b) What are the common names of (i) Ethyne (ii) Ethene (c) What is the chemical and structural formula of benzene?

Answer»

(a) Give the name and structural formula of one member each of the following :
(i) alkane (ii) alkene (iii) alkyne (iv) cycloalkane

(b) What are the common names of (i) Ethyne (ii) Ethene

(c) What is the chemical and structural formula of benzene?

Discussion

11004.	Classify acids on the basis of their ionisation and explain each of them with examples.
Answer» Classify acids on the basis of their ionisation and explain each of them with examples.

Discussion

11005.	The property of self-combination of the atoms of the same element to form long chains is known as : (a) protonation (b) carbonation (c) coronation (d) catenation
Answer» The property of self-combination of the atoms of the same element to form long chains is known as : (a) protonation (b) carbonation (c) coronation (d) catenation

Discussion

11006.	Identify 'A' and 'B' in the following reactions (i) KNO3+KHSO4→A+HNO3 (ii) KNO3+H2SO42000c−−−→KHSO4+B
Answer» Identify 'A' and 'B' in the following reactions (i) $K N O_{3} + K H S O_{4} \to A + H N O_{3}$ (ii) $K N O_{3} + H_{2} S O_{4} 200^{0} c - -- \to K H S O_{4} + B$

11006.

Identify 'A' and 'B' in the following reactions (i) KNO3+KHSO4→A+HNO3 (ii) KNO3+H2SO42000c−−−→KHSO4+B

Answer»

Identify 'A' and 'B' in the following reactions

(i) $K N O_{3} + K H S O_{4} \to A + H N O_{3}$

(ii) $K N O_{3} + H_{2} S O_{4} 200^{0} c - -- \to K H S O_{4} + B$

Discussion

11007.	Why does nitric acid gives hydrogen only with magnesium and manganese
Answer» Why does nitric acid gives hydrogen only with magnesium and manganese

Discussion

11008.	What is smelting
Answer» What is smelting

Discussion

11009.	When we translate hydrogen gas combines with nitrogen to form ammonia into chemical equation . Why there is 3h2 for hydrogen gas not h2 only.
Answer» When we translate hydrogen gas combines with nitrogen to form ammonia into chemical equation . Why there is 3h2 for hydrogen gas not h2 only.

Discussion

11010.	What happens to carbon when it reacts?
Answer» What happens to carbon when it reacts?

Discussion

11011.	Write the chemical equation to represent the ionic dissociation of sodium hydroxide in aqueous medium
Answer» Write the chemical equation to represent the ionic dissociation of sodium hydroxide in aqueous medium

Discussion

11012.	The temporary bleaching action by sulphur dioxide can be reversed by reacting the material with :
Answer» The temporary bleaching action by sulphur dioxide can be reversed by reacting the material with :

Discussion

11013.	water helps in separation of oppositely charged ions from the ionic compound give reason
Answer» water helps in separation of oppositely charged ions from the ionic compound give reason

Discussion

11014.	The valency of magnesium and chlorine in magnesium chloride is:
Answer» The valency of magnesium and chlorine in magnesium chloride is:

Discussion

11015.	Electromagnetic force is stronger than gravitational force This is an imaginary question We are in the moon the gravitational force is weaker is it possible to collide the nucleus of noble gases?
Answer» Electromagnetic force is stronger than gravitational force This is an imaginary question We are in the moon the gravitational force is weaker is it possible to collide the nucleus of noble gases?

11015.

Electromagnetic force is stronger than gravitational force This is an imaginary question We are in the moon the gravitational force is weaker is it possible to collide the nucleus of noble gases?

Answer»

Electromagnetic force is stronger than gravitational force

This is an imaginary question

We are in the moon the gravitational force is weaker is it possible to collide the nucleus of noble gases?

Discussion

11016.	X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?
Answer» X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?

Discussion

11017.	Is calcium hydroxide an alkali or an insoluble base? The book says it's an alkali (soluble in water) but when NaOH reacts with Calcium Nitrate, we get insoluble ppt. of Calcium hydroxide (insoluble in water). What is correct?
Answer» Is calcium hydroxide an alkali or an insoluble base? The book says it's an alkali (soluble in water) but when NaOH reacts with Calcium Nitrate, we get insoluble ppt. of Calcium hydroxide (insoluble in water). What is correct?

Discussion

11018.	Question 47(d) Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How many valence electrons are present in each one of them?
Answer» Question 47(d) Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How many valence electrons are present in each one of them?

Discussion

11019.	How do toxic substances accumulate in the bodies of organisms as we go up a food chain
Answer» How do toxic substances accumulate in the bodies of organisms as we go up a food chain

Discussion

11020.	Choose the option that correctly ranks the types of coals based on their carbon content.
Answer» Choose the option that correctly ranks the types of coals based on their carbon content.

Discussion

11021.	Why is iodine lustrous despite being a non metal
Answer» Why is iodine lustrous despite being a non metal

Discussion

11022.	How to find how many isomers would be formed by any hydrocarbon? Please tell the method.
Answer» How to find how many isomers would be formed by any hydrocarbon? Please tell the method.

Discussion

11023.	Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit ?
Answer» Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit ?

Discussion

11024.	A non-metal which forms positive ions is ___.
Answer» A non-metal which forms positive ions is ___.

Discussion

11025.	Find the odd one out (note: valency is not a criterion).
Answer» Find the odd one out (note: valency is not a criterion).

Discussion

11026.	State two conditions for the rusting of iron.
Answer» State two conditions for the rusting of iron.

Discussion

11027.	Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio ___.
Answer» Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio ___.

Discussion

11028.	CH3OH + CH3COOH → CH3COOCH3 + H2O This reaction is an example of:
Answer» CH₃OH + CH₃COOH → CH₃COOCH₃ + H₂O This reaction is an example of:

Discussion

11029.	Which of the following oxides react with both acids and bases?
Answer» Which of the following oxides react with both acids and bases?

Discussion

11030.	Write 'true' or 'false' against the following statements : (a) Carbon constitutes 0.03% of the earth's crust. (b) Graphite is the purest form of carbon. (c) Coloured diamonds are costlier than colourless and transparent diamonds. (d) Graphite has layers of hexagonal carbon bondings. (e) Diamond is insoluble in all solvents.
Answer» Write 'true' or 'false' against the following statements : (a) Carbon constitutes 0.03 $%$ of the earth's crust. (b) Graphite is the purest form of carbon. (c) Coloured diamonds are costlier than colourless and transparent diamonds. (d) Graphite has layers of hexagonal carbon bondings. (e) Diamond is insoluble in all solvents.

11030.

Write 'true' or 'false' against the following statements : (a) Carbon constitutes 0.03% of the earth's crust. (b) Graphite is the purest form of carbon. (c) Coloured diamonds are costlier than colourless and transparent diamonds. (d) Graphite has layers of hexagonal carbon bondings. (e) Diamond is insoluble in all solvents.

Answer»

Write 'true' or 'false' against the following statements :

(a) Carbon constitutes 0.03 $%$ of the earth's crust.

(b) Graphite is the purest form of carbon.

(c) Coloured diamonds are costlier than colourless and transparent diamonds.

(d) Graphite has layers of hexagonal carbon bondings.

(e) Diamond is insoluble in all solvents.

Discussion

11031.	In electrolytic refining, the impure metal is made as:
Answer» In electrolytic refining, the impure metal is made as:

Discussion

11032.	Principal quantum number of an atom represents:
Answer» Principal quantum number of an atom represents:

Discussion

11033.	The given reaction is an example of ___________ reaction. C + 2S + Δ → CS2
Answer» The given reaction is an example of ___________ reaction. C + 2S + Δ → CS₂

11033.

The given reaction is an example of ___________ reaction. C + 2S + Δ → CS2

Answer»

The given reaction is an example of ___________ reaction.

C + 2S + Δ → CS₂

Discussion

11034.	Which of the following statements is true in concentration of ore?
Answer» Which of the following statements is true in concentration of ore?

Discussion

11035.	In the species i) 4.0g of NaOH ii) 4.8g of SO2 iii) 4.0 g of CO2 iv) 2.8 g of CaO decreasing order of the weight of oxygen is
Answer» In the species i) 4.0g of $N a O H$ ii) 4.8g of $S O_{2}$ iii) 4.0 g of $C O_{2}$ iv) 2.8 g of $C a O$ decreasing order of the weight of oxygen is

Discussion

11036.	Question 3 Give any two ways in which non-biodegradable substances would affect the environment.
Answer» Question 3 Give any two ways in which non-biodegradable substances would affect the environment.

Discussion

11037.	Which of the following method is used to extract metals from their carbonate ores?
Answer» Which of the following method is used to extract metals from their carbonate ores?

Discussion

11038.	Name : (a) compound formed when acetic acid and ethanol react together. (b) the reducing agent used to convert acetic acid into ethanol. (c) the substance used to change acetic acid to acetic anhydride.
Answer» Name : (a) compound formed when acetic acid and ethanol react together. (b) the reducing agent used to convert acetic acid into ethanol. (c) the substance used to change acetic acid to acetic anhydride.

Discussion

11039.	As oxygen has an atomic radius greater than nitrogen similarly, does sulphur has an atomic radius greater than phosphorus?
Answer» As oxygen has an atomic radius greater than nitrogen similarly, does sulphur has an atomic radius greater than phosphorus?

Discussion

11040.	what is the diiference between minerals and ores?
Answer» what is the diiference between minerals and ores?

Discussion

11041.	What is curdling of milk? Is it a desirable change or a undesirable change?
Answer» What is curdling of milk? Is it a desirable change or a undesirable change?

Discussion

11042.	When an excess of sodium hydroxide is added to lead nitrate, a ____ precipitate of lead (II) oxide is formed.
Answer» When an excess of sodium hydroxide is added to lead nitrate, a ____ precipitate of lead (II) oxide is formed.

Discussion

11043.	What will be A, B and C if the following reaction is balanced? AFeCl3+BMgO→Fe2O3+CMgCl2
Answer» What will be A, B and C if the following reaction is balanced? $A F e C l_{3} + B M g O \to F e_{2} O_{3} + C M g C l_{2}$

Discussion

11044.	Give the importance of decomposition reaction in metal industry (3 points) Please give the answer in reference to the NCERT textbook.
Answer» Give the importance of decomposition reaction in metal industry (3 points) Please give the answer in reference to the NCERT textbook.

11044.

Give the importance of decomposition reaction in metal industry (3 points) Please give the answer in reference to the NCERT textbook.

Answer»

Give the importance of decomposition reaction in metal industry (3 points)

Please give the answer in reference to the NCERT textbook.

Discussion

11045.	Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to the test tube A while acetic acid is added to test tube B.In which test tube will the fizzing occur more vigorously?
Answer» Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to the test tube A while acetic acid is added to test tube B.In which test tube will the fizzing occur more vigorously?

Discussion

11046.	1 coulomb is equal to 109nano coulomb 10-9 micro coulomb 10 -9 nano ampere 109 micro coulomb
Answer» 1 coulomb is equal to 10^{9_{nano coulomb}} 10^{-9 _{micro coulomb 10} -9 nano ampere 109 micro coulomb}

Discussion

11047.	Which of the following will give brisk effervescence with sodium hydrogen carbonate and why? CH3COOH, CH3CH2OH
Answer» Which of the following will give brisk effervescence with sodium hydrogen carbonate and why? $C H_{3} C O O H, C H_{3} C H_{2} O H$

Discussion

11048.	Why can not each metal react to its own salt (Eg. Cu and CuSO4) ?
Answer» Why can not each metal react to its own salt (Eg. Cu and CuSO4) ?

Discussion

11049.	Which of the following elements are the constituents of stainless steel?
Answer» Which of the following elements are the constituents of stainless steel?

Discussion

11050.	Which of the following is used as the drying agent in the purifying process of HCl gas ?
Answer» Which of the following is used as the drying agent in the purifying process of HCl gas ?

Discussion

Explore topic-wise InterviewSolutions in .

Why does tooth decay start when the pH of mouth is lower than 5.5 ?

Why is copper hydroxide soluble in excess of ammonia solution and not soluble in excess of caustic potash?

(a) Give the name and structural formula of one member each of the following : (i) alkane (ii) alkene (iii) alkyne (iv) cycloalkane (b) What are the common names of (i) Ethyne (ii) Ethene (c) What is the chemical and structural formula of benzene?

Classify acids on the basis of their ionisation and explain each of them with examples.

The property of self-combination of the atoms of the same element to form long chains is known as : (a) protonation (b) carbonation (c) coronation (d) catenation

Identify 'A' and 'B' in the following reactions (i) KNO3+KHSO4→A+HNO3 (ii) KNO3+H2SO42000c−−−→KHSO4+B

Why does nitric acid gives hydrogen only with magnesium and manganese

What is smelting

When we translate hydrogen gas combines with nitrogen to form ammonia into chemical equation . Why there is 3h2 for hydrogen gas not h2 only.

What happens to carbon when it reacts?

Write the chemical equation to represent the ionic dissociation of sodium hydroxide in aqueous medium

The temporary bleaching action by sulphur dioxide can be reversed by reacting the material with :

water helps in separation of oppositely charged ions from the ionic compound give reason

The valency of magnesium and chlorine in magnesium chloride is:

Electromagnetic force is stronger than gravitational force This is an imaginary question We are in the moon the gravitational force is weaker is it possible to collide the nucleus of noble gases?

X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?

Is calcium hydroxide an alkali or an insoluble base? The book says it's an alkali (soluble in water) but when NaOH reacts with Calcium Nitrate, we get insoluble ppt. of Calcium hydroxide (insoluble in water). What is correct?

Question 47(d) Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How many valence electrons are present in each one of them?

How do toxic substances accumulate in the bodies of organisms as we go up a food chain

Choose the option that correctly ranks the types of coals based on their carbon content.

Why is iodine lustrous despite being a non metal

How to find how many isomers would be formed by any hydrocarbon? Please tell the method.

Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit ?

A non-metal which forms positive ions is ___.

Find the odd one out (note: valency is not a criterion).

State two conditions for the rusting of iron.

Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio ___.

CH3OH + CH3COOH → CH3COOCH3 + H2O This reaction is an example of:

Which of the following oxides react with both acids and bases?

In electrolytic refining, the impure metal is made as:

Principal quantum number of an atom represents:

The given reaction is an example of ___________ reaction. C + 2S + Δ → CS2

Which of the following statements is true in concentration of ore?

In the species i) 4.0g of NaOH ii) 4.8g of SO2 iii) 4.0 g of CO2 iv) 2.8 g of CaO decreasing order of the weight of oxygen is

Question 3 Give any two ways in which non-biodegradable substances would affect the environment.

Which of the following method is used to extract metals from their carbonate ores?

Name : (a) compound formed when acetic acid and ethanol react together. (b) the reducing agent used to convert acetic acid into ethanol. (c) the substance used to change acetic acid to acetic anhydride.

As oxygen has an atomic radius greater than nitrogen similarly, does sulphur has an atomic radius greater than phosphorus?

what is the diiference between minerals and ores?

What is curdling of milk? Is it a desirable change or a undesirable change?

When an excess of sodium hydroxide is added to lead nitrate, a ____ precipitate of lead (II) oxide is formed.

What will be A, B and C if the following reaction is balanced? AFeCl3+BMgO→Fe2O3+CMgCl2

Give the importance of decomposition reaction in metal industry (3 points) Please give the answer in reference to the NCERT textbook.

Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to the test tube A while acetic acid is added to test tube B.In which test tube will the fizzing occur more vigorously?

1 coulomb is equal to 109nano coulomb 10-9 micro coulomb 10 -9 nano ampere 109 micro coulomb

Which of the following will give brisk effervescence with sodium hydrogen carbonate and why? CH3COOH, CH3CH2OH

Why can not each metal react to its own salt (Eg. Cu and CuSO4) ?

Which of the following elements are the constituents of stainless steel?

Which of the following is used as the drying agent in the purifying process of HCl gas ?