15280 + Interview Questions in Chemistry Page 274 InterviewSolution

13651.	name a chemical used ffor dissolving al2o3.In which state of subdivision is the chemical used.
Answer» name a chemical used ffor dissolving al2o3.In which state of subdivision is the chemical used.

Discussion

13652.	(a) Did Dobereiner’s triads also exist in the columns of Newland’s law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements? (c) What were the limitations of Newland’s law of octaves?
Answer» (a) Did Dobereiner’s triads also exist in the columns of Newland’s law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements? (c) What were the limitations of Newland’s law of octaves?

13652.

(a) Did Dobereiner’s triads also exist in the columns of Newland’s law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements? (c) What were the limitations of Newland’s law of octaves?

Answer»

(a) Did Dobereiner’s triads also exist in the columns of Newland’s law of octaves? Explain your answer.

(b) What were the limitations of Dobereiner’s classification of elements?

(c) What were the limitations of Newland’s law of octaves?

Discussion

13653.	What is meant by aqueous ? Give an example
Answer» What is meant by aqueous ? Give an example

Discussion

13654.	4 oxides were taken in a test tube - Na2O,MgO,SO3,Cl2O7. Which of the following oxide is most acidic?
Answer» 4 oxides were taken in a test tube - $N a_{2} O, M g O, S O_{3}, C l_{2} O_{7}$ . Which of the following oxide is most acidic?

Discussion

13655.	Which substance is formed when aluminium reacts with oxygen?
Answer» Which substance is formed when aluminium reacts with oxygen?

Discussion

13656.	The pH of four solutions A,B,C and D are given below: A = 1, B = 8.5, C = 13 and D = 5. Arrange the solutions according to the increasing order of their acidity.
Answer» The pH of four solutions A,B,C and D are given below: A = 1, B = 8.5, C = 13 and D = 5. Arrange the solutions according to the increasing order of their acidity.

13656.

The pH of four solutions A,B,C and D are given below: A = 1, B = 8.5, C = 13 and D = 5. Arrange the solutions according to the increasing order of their acidity.

Answer»

The pH of four solutions A,B,C and D are given below:

A = 1, B = 8.5, C = 13 and D = 5.

Arrange the solutions according to the increasing order of their acidity.

Discussion

13657.	What are five types of salts? Explain with examples. [5 MARKS]
Answer» What are five types of salts? Explain with examples. [5 MARKS]

Discussion

13658.	The product formed when 2, 3 Dimethylpent-2-ene reacts with chlorine & water is
Answer» The product formed when 2, 3 Dimethylpent-2-ene reacts with chlorine & water is

Discussion

13659.	Which of the following is a metalloid?
Answer» Which of the following is a metalloid?

Discussion

13660.	A food web is formed by
Answer» A food web is formed by

Discussion

13661.	Write the electron-dot structures for the following molecules: (i)NaCl (ii)Cl2
Answer» Write the electron-dot structures for the following molecules: $(i) N a C l (i i) C l_{2}$

Discussion

13662.	An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.
Answer» An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.

Discussion

13663.	When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.3, approximately 108) the amount of silver deposited is:
Answer» When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.3, approximately 108) the amount of silver deposited is:

Discussion

13664.	Teflon, polystyrene and neoprene are all ________.
Answer» Teflon, polystyrene and neoprene are all ________.

Discussion

13665.	Which of the following alloys contains a non-metal as one of the constituents? (a) brass (b) amalgam (c) steel (d) bronze
Answer» Which of the following alloys contains a non-metal as one of the constituents? (a) brass (b) amalgam (c) steel (d) bronze

Discussion

13666.	The most metallic among the given elements is _______.
Answer» The most metallic among the given elements is _______.

Discussion

13667.	Which of the following reaction is metathesis reaction?
Answer» Which of the following reaction is metathesis reaction?

Discussion

13668.	Consider C6H12O6 molecule for balancing hydrogen molecules in the reaction.What should be the value of X (coefficient of H2O)?
Answer» Consider $C_{6} H_{12} O_{6}$ molecule for balancing hydrogen molecules in the reaction.What should be the value of X (coefficient of $H_{2} O$ )?

13668.

Consider C6H12O6 molecule for balancing hydrogen molecules in the reaction.What should be the value of X (coefficient of H2O)?

Answer»

Consider $C_{6} H_{12} O_{6}$ molecule for balancing hydrogen molecules in the reaction.What should be the value of X (coefficient of $H_{2} O$ )?

Discussion

13669.	Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8).[Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm3 at stp] 5.20 litres3.50 litres2.58 litres4.48 litres1.99 litres
Answer» Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C₃H₈). [Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm³ at stp] 5.20 litres 3.50 litres 2.58 litres 4.48 litres 1.99 litres

13669.

Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8).[Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm3 at stp] 5.20 litres3.50 litres2.58 litres4.48 litres1.99 litres

Answer»

Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C₃H₈).

[Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm³ at stp]

5.20 litres

3.50 litres

2.58 litres

4.48 litres

1.99 litres

Discussion

13670.	All elements tend to obey octet rule except hydrogen. Why is it so?
Answer» All elements tend to obey octet rule except hydrogen. Why is it so?

Discussion

13671.	2Cu+O22CuO Which type of reaction is this?
Answer» $2 C u + O_{2} 2 C u O$ Which type of reaction is this?

Discussion

13672.	(a) Give the reason why copper is used to make hot water tanks but steel (an alloy of iron) is not (b) Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.
Answer» (a) Give the reason why copper is used to make hot water tanks but steel (an alloy of iron) is not (b) Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.

Discussion

13673.	What is xanthoproteic acid?
Answer» What is xanthoproteic acid?

Discussion

13674.	What is the rule for determining if a bond is ionic?
Answer» What is the rule for determining if a bond is ionic?

Discussion

13675.	The number of electrons that can be accommodated in K-shell of an atom is ___
Answer» The number of electrons that can be accommodated in K-shell of an atom is ___

Discussion

13676.	The isomer of diethyl ether is
Answer» The isomer of diethyl ether is

Discussion

13677.	Which of the following is/are true?
Answer» Which of the following is/are true?

Discussion

13678.	A molecule is stable when : (Nb = bonding electrons, Na = antibonding electrons)
Answer» A molecule is stable when : ( $N_{b}$ = bonding electrons, $N_{a}$ = antibonding electrons)

Discussion

13679.	(a) Write happens when calcium reacts with water? Write the chemical equation of the reaction of calcium. (b) Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
Answer» (a) Write happens when calcium reacts with water? Write the chemical equation of the reaction of calcium. (b) Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?

Discussion

13680.	What chemical reactions take place when quicklime is added to water filled in a bucket?
Answer» What chemical reactions take place when quicklime is added to water filled in a bucket?

Discussion

13681.	Due to the presence of strong electrostatic forces of attraction between ions, ionic compounds:
Answer» Due to the presence of strong electrostatic forces of attraction between ions, ionic compounds:

Discussion

13682.	Bee-sting contains
Answer» Bee-sting contains

Discussion

13683.	Ionic bond involves:
Answer» Ionic bond involves:

Discussion

13684.	Which series of reaction correctly chemical reactions related to iron and its compound? (IIT-JEE, 2014)
Answer» Which series of reaction correctly chemical reactions related to iron and its compound? (IIT-JEE, 2014)

Discussion

13685.	Tendency of an atom in a molecule to attract the shared pair of electron towards itself is called:
Answer» Tendency of an atom in a molecule to attract the shared pair of electron towards itself is called:

Discussion

13686.	Aluminium oxide reacts with potassium hydroxide to form white salt and water. What is the nature of aluminium oxide?
Answer» Aluminium oxide reacts with potassium hydroxide to form white salt and water. What is the nature of aluminium oxide?

Discussion

13687.	Electrolysis of water is exothermic or endothermic reaction.
Answer» Electrolysis of water is exothermic or endothermic reaction.

Discussion

13688.	(a) What is an alloy? How is an alloy made? (b) What elements are present in steel? How are the properties of steel different from those of pure iron? (c) Give the constituents and one use of brass.
Answer» (a) What is an alloy? How is an alloy made? (b) What elements are present in steel? How are the properties of steel different from those of pure iron? (c) Give the constituents and one use of brass.

Discussion

13689.	Which metal does not reacts with oxygen?
Answer» Which metal does not reacts with oxygen?

Discussion

13690.	The lustrous property of a metal is due to
Answer» The lustrous property of a metal is due to

Discussion

13691.	You are given a solution of AgNO3 Which of the following do you think cannot displace Ag from AgNO3 (a) Magnesium (b) Zinc (c) Gold (d) Copper
Answer» You are given a solution of $A g N O_{3}$ Which of the following do you think cannot displace Ag from $A g N O_{3}$ (a) Magnesium (b) Zinc (c) Gold (d) Copper

Discussion

13692.	How can dental caries be prevented?
Answer» How can dental caries be prevented?

Discussion

13693.	The article to be electroplated is always placed at__.
Answer» The article to be electroplated is always placed at__.

Discussion

13694.	Atomic radius is of the order of 10−8 cm and the nuclear radius is of the order of 10−13 cm. Calculate the fraction of atom occupied by the nucleus.
Answer» Atomic radius is of the order of $10^{- 8}$ cm and the nuclear radius is of the order of $10^{- 13}$ cm. Calculate the fraction of atom occupied by the nucleus.

Discussion

13695.	An unknown gas shows a density of 3 g per litre at 273∘ and 1140 mm Hg pressure. What is the gram molecular mass of this gas?
Answer» An unknown gas shows a density of 3 g per litre at $273^{\circ}$ and 1140 mm Hg pressure. What is the gram molecular mass of this gas?

Discussion

13696.	Why is Hydrogen peroxide stored in coloured bottles?
Answer» Why is Hydrogen peroxide stored in coloured bottles?

Discussion

13697.	An organic compound burns with a sooty flame. Is it saturated or unsaturated compound?
Answer» An organic compound burns with a sooty flame. Is it saturated or unsaturated compound?

Discussion

13698.	If Mg lies above Al ie, Mg is more reactive than Al... Then why does Al replace Mg from MgO (magnesium oxide) And is used extract magnesium from magnesium oxide
Answer» If Mg lies above Al ie, Mg is more reactive than Al... Then why does Al replace Mg from MgO (magnesium oxide) And is used extract magnesium from magnesium oxide

13698.

If Mg lies above Al ie, Mg is more reactive than Al... Then why does Al replace Mg from MgO (magnesium oxide) And is used extract magnesium from magnesium oxide

Answer»

If Mg lies above Al ie, Mg is more reactive than Al...

Then why does Al replace Mg from MgO (magnesium oxide)

And is used extract magnesium from magnesium oxide

Discussion

13699.	Noble metals are dissolved in
Answer» Noble metals are dissolved in

Discussion

13700.	What is the unit of STP
Answer» What is the unit of STP

Discussion

Explore topic-wise InterviewSolutions in .

name a chemical used ffor dissolving al2o3.In which state of subdivision is the chemical used.

(a) Did Dobereiner’s triads also exist in the columns of Newland’s law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements? (c) What were the limitations of Newland’s law of octaves?

What is meant by aqueous ? Give an example

4 oxides were taken in a test tube - Na2O,MgO,SO3,Cl2O7. Which of the following oxide is most acidic?

Which substance is formed when aluminium reacts with oxygen?

The pH of four solutions A,B,C and D are given below: A = 1, B = 8.5, C = 13 and D = 5. Arrange the solutions according to the increasing order of their acidity.

What are five types of salts? Explain with examples. [5 MARKS]

The product formed when 2, 3 Dimethylpent-2-ene reacts with chlorine &amp; water is

Which of the following is a metalloid?

A food web is formed by

Write the electron-dot structures for the following molecules: (i)NaCl (ii)Cl2

An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.

When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.3, approximately 108) the amount of silver deposited is:

Teflon, polystyrene and neoprene are all ________.

Which of the following alloys contains a non-metal as one of the constituents? (a) brass (b) amalgam (c) steel (d) bronze

The most metallic among the given elements is _______.

Which of the following reaction is metathesis reaction?

Consider C6H12O6 molecule for balancing hydrogen molecules in the reaction.What should be the value of X (coefficient of H2O)?

Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8).[Atomic mass: C = 12, O = 16, H = 1, Molar volume = 22.4 dm3 at stp] 5.20 litres3.50 litres2.58 litres4.48 litres1.99 litres

All elements tend to obey octet rule except hydrogen. Why is it so?

2Cu+O22CuO Which type of reaction is this?

(a) Give the reason why copper is used to make hot water tanks but steel (an alloy of iron) is not (b) Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.

What is xanthoproteic acid?

What is the rule for determining if a bond is ionic?

The number of electrons that can be accommodated in K-shell of an atom is ___

The isomer of diethyl ether is

Which of the following is/are true?

A molecule is stable when : (Nb = bonding electrons, Na = antibonding electrons)

(a) Write happens when calcium reacts with water? Write the chemical equation of the reaction of calcium. (b) Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?

What chemical reactions take place when quicklime is added to water filled in a bucket?

Due to the presence of strong electrostatic forces of attraction between ions, ionic compounds:

Bee-sting contains

Ionic bond involves:

Which series of reaction correctly chemical reactions related to iron and its compound? (IIT-JEE, 2014)

Tendency of an atom in a molecule to attract the shared pair of electron towards itself is called:

Aluminium oxide reacts with potassium hydroxide to form white salt and water. What is the nature of aluminium oxide?

Electrolysis of water is exothermic or endothermic reaction.

(a) What is an alloy? How is an alloy made? (b) What elements are present in steel? How are the properties of steel different from those of pure iron? (c) Give the constituents and one use of brass.

Which metal does not reacts with oxygen?

The lustrous property of a metal is due to

You are given a solution of AgNO3 Which of the following do you think cannot displace Ag from AgNO3 (a) Magnesium (b) Zinc (c) Gold (d) Copper

How can dental caries be prevented?

The article to be electroplated is always placed at__.

Atomic radius is of the order of 10−8 cm and the nuclear radius is of the order of 10−13 cm. Calculate the fraction of atom occupied by the nucleus.

An unknown gas shows a density of 3 g per litre at 273∘ and 1140 mm Hg pressure. What is the gram molecular mass of this gas?

Why is Hydrogen peroxide stored in coloured bottles?

An organic compound burns with a sooty flame. Is it saturated or unsaturated compound?

If Mg lies above Al ie, Mg is more reactive than Al... Then why does Al replace Mg from MgO (magnesium oxide) And is used extract magnesium from magnesium oxide

Noble metals are dissolved in

What is the unit of STP

The product formed when 2, 3 Dimethylpent-2-ene reacts with chlorine & water is