15280 + Interview Questions in Chemistry Page 259 InterviewSolution

12901.	Dilute sulphuric acid is a good :
Answer» Dilute sulphuric acid is a good :

Discussion

12902.	In the context of redox reactions, the removal of hydrogen from a substance is known as : (a) oxidation (b) dehydration (c) reduction (d) dehydrogenation
Answer» In the context of redox reactions, the removal of hydrogen from a substance is known as : (a) oxidation (b) dehydration (c) reduction (d) dehydrogenation

Discussion

12903.	A colourless lead salt, when heated, produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.
Answer» A colourless lead salt, when heated, produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.

12903.

A colourless lead salt, when heated, produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.

Answer»

A colourless lead salt, when heated, produces a yellow residue and brown fumes.

(a) Name the lead salt.

(b) Name the brown fumes.

(c) Write a chemical equation of the reaction involved.

Discussion

12904.	What are the five uses of washing soda? [5 MARKS]
Answer» What are the five uses of washing soda? [5 MARKS]

Discussion

12905.	What are metalloids? Give two examples. [3 MARKS]
Answer» What are metalloids? Give two examples. [3 MARKS]

Discussion

12906.	Which of the following is the common name of ethyne?
Answer» Which of the following is the common name of ethyne?

Discussion

12907.	The root word for naming a hydrocarbon with 5 carbons is?
Answer» The root word for naming a hydrocarbon with 5 carbons is?

Discussion

12908.	The standard reduction potentials, E∘, for the half-reactions are as Zn=Zn2++2e, E∘= + 0.76 V and Fe=Fe2++2e, E∘ = + 0.41 V. The e.m.f. for the cell reaction, Fe2++Zn=Zn2++Fe is
Answer» The standard reduction potentials, $E^{\circ}$ , for the half-reactions are as $Z n = Z n^{2 +} + 2 e$ , $E^{\circ}$ = + 0.76 V and $F e = F e^{2 +} + 2 e$ , $E^{\circ}$ = + 0.41 V. The e.m.f. for the cell reaction, $F e^{2 +} + Z n = Z n^{2 +} + F e$ is

Discussion

12909.	_________ can react with both acids and alkalis to give salt and water.Amphoteric Metal
Answer» _________ can react with both acids and alkalis to give salt and water. Amphoteric Metal

Discussion

12910.	write the name of ore for the following coups 1.sodium chloride 2.aluminium oxide 3.zince carbonate 4.copper sulphide 5 iron oxide 6.magnese dioxide
Answer» write the name of ore for the following coups 1.sodium chloride 2.aluminium oxide 3.zince carbonate 4.copper sulphide 5 iron oxide 6.magnese dioxide

Discussion

12911.	If pressure becomes double at the same absolute temperature on 2 L of CO2, then what will be the final volume of CO2?
Answer» If pressure becomes double at the same absolute temperature on $2 L$ of $C O_{2}$ , then what will be the final volume of $C O_{2}$ ?

Discussion

12912.	Why is it so that the pillars near the qutub minar in Delhi is not corroded yet even though it's made up of iron
Answer» Why is it so that the pillars near the qutub minar in Delhi is not corroded yet even though it's made up of iron

Discussion

12913.	What is the formal charge on the starred oxygen atom?
Answer» What is the formal charge on the starred oxygen atom?

12913.

What is the formal charge on the starred oxygen atom?

Answer»

What is the formal charge on the starred oxygen atom?

Discussion

12914.	Energy flow is ______.
Answer» Energy flow is ______.

Discussion

12915.	Which of the following metals can't be used to make utensils?
Answer» Which of the following metals can't be used to make utensils?

Discussion

12916.	What is a Functional group ?
Answer» What is a Functional group ?

Discussion

12917.	Acids react with carbonates to give ___ as one of the products.
Answer» Acids react with carbonates to give ___ as one of the products.

Discussion

12918.	Pick the incorrect statement regarding ionic bonds.
Answer» Pick the incorrect statement regarding ionic bonds.

Discussion

12919.	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

12920.	Which of the following gas is released when Pb3O4 is heated?
Answer» Which of the following gas is released when $P b_{3} O_{4}$ is heated?

Discussion

12921.	what happens when: (i)dil.HCl is added to solid Na2CO3? (ii)quicklime is treated with water? (iii)sodium chloride solution is added to lead nitrate solution?
Answer» what happens when: (i)dil.HCl is added to solid Na₂CO₃? (ii)quicklime is treated with water? (iii)sodium chloride solution is added to lead nitrate solution?

12921.

what happens when: (i)dil.HCl is added to solid Na2CO3? (ii)quicklime is treated with water? (iii)sodium chloride solution is added to lead nitrate solution?

Answer»

what happens when:

(i)dil.HCl is added to solid Na₂CO₃?

(ii)quicklime is treated with water?

(iii)sodium chloride solution is added to lead nitrate solution?

Discussion

12922.	Which chemical process is used for obtaining a metal from its oxide? [3 MARKS]
Answer» Which chemical process is used for obtaining a metal from its oxide? [3 MARKS]

Discussion

12923.	What are the benefits of household waste water recycling systems?
Answer» What are the benefits of household waste water recycling systems?

Discussion

12924.	What do you mean by recharging of the accumulator? What is the e.m.f of a freshly charged lead acid accumulator?
Answer» What do you mean by recharging of the accumulator? What is the e.m.f of a freshly charged lead acid accumulator?

Discussion

12925.	Which of the following is a use of an electrolytic decomposition reaction?
Answer» Which of the following is a use of an electrolytic decomposition reaction?

Discussion

12926.	Which salt can be used to identify coloured cation qualitatively in inorganic chemistry?
Answer» Which salt can be used to identify coloured cation qualitatively in inorganic chemistry?

Discussion

12927.	(a) What are the following groups known as ? (i) Group 1 (ii) Group 17 (iii) Group 18 (b) Name two elements of each group.
Answer» (a) What are the following groups known as ? (i) Group 1 (ii) Group 17 (iii) Group 18 (b) Name two elements of each group.

12927.

(a) What are the following groups known as ? (i) Group 1 (ii) Group 17 (iii) Group 18 (b) Name two elements of each group.

Answer»

(a) What are the following groups known as ?

(i) Group 1 (ii) Group 17 (iii) Group 18

(b) Name two elements of each group.

Discussion

12928.	(a) Name the charged particles which attract one another to form electrovalent compounds. (b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compounds ? (c) The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule ? (d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.
Answer» (a) Name the charged particles which attract one another to form electrovalent compounds. (b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compounds ? (c) The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule ? (d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.

12928.

(a) Name the charged particles which attract one another to form electrovalent compounds. (b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compounds ? (c) The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule ? (d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.

Answer»

(a) Name the charged particles which attract one another to form electrovalent compounds.

(b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compounds ?

(c) The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule ?

(d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.

Discussion

12929.	Choose the incorrect statement regarding ethanol from the options given below.
Answer» Choose the incorrect statement regarding ethanol from the options given below.

Discussion

12930.	The density of a gas at normal pressure and 27∘C temperature is 24 g/cc. Keeping the pressure constant, the density at 127∘C (in g/cc) will be
Answer» The density of a gas at normal pressure and $27^{\circ} C$ temperature is 24 $g / c c$ . Keeping the pressure constant, the density at $127^{\circ} C (i n g / c c)$ will be

Discussion

12931.	In the cyanide ion, the formal negative charge is on
Answer» In the cyanide ion, the formal negative charge is on

12931.

In the cyanide ion, the formal negative charge is on

Answer»

In the cyanide ion, the formal negative charge is on

Discussion

12932.	Which of the following is an iron ore? (a) chnnabar (b) calamine (c) haematite (d) rock salt
Answer» Which of the following is an iron ore? (a) chnnabar (b) calamine (c) haematite (d) rock salt

Discussion

12933.	CH3COOH+CH3CH2OH→CH3COOC2H5+H2O This reaction is called as ___ reaction.
Answer» $C H_{3} C O O H + C H_{3} C H_{2} O H \to C H_{3} C O O C_{2} H_{5} + H_{2} O$ This reaction is called as ___ reaction.

Discussion

12934.	The atomic number of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound? (a) P and R (b) Q and S (c) P and S (d) R and S
Answer» The atomic number of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound? (a) P and R (b) Q and S (c) P and S (d) R and S

Discussion

12935.	An element X is in group 2 of the periodic table : (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?
Answer» An element X is in group 2 of the periodic table : (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?

12935.

An element X is in group 2 of the periodic table : (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?

Answer»

An element X is in group 2 of the periodic table :

(a) What will be the formula of its chloride?

(b) What will be the formula of its oxide?

Discussion

12936.	The hardness of water is due the presence of ___.
Answer» The hardness of water is due the presence of ___.

Discussion

12937.	The total number of moles present in a gaseous mixture containing 8 g of oxygen, 11.2 litres of CO2 and 3 × 1022 molecules of N2 at STP is
Answer» The total number of moles present in a gaseous mixture containing $8 g$ of oxygen, $11.2 l i t r e s$ of $C O_{2}$ and $3 \times 10^{22}$ molecules of $N_{2}$ at STP is

Discussion

12938.	Which acid is preferrably used in acidulating/acidifying water during the elctrolysis of water? Why? Explain in detail.
Answer» Which acid is preferrably used in acidulating/acidifying water during the elctrolysis of water? Why? Explain in detail.

Discussion

12939.	Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so ?
Answer» Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so ?

Discussion

12940.	Why do soaps not work well with woolen clothes?
Answer» Why do soaps not work well with woolen clothes?

Discussion

12941.	Which of the following aqueous solution will conduct an electric current quite well [MP PMT 1987]
Answer» Which of the following aqueous solution will conduct an electric current quite well [MP PMT 1987]

12941.

Which of the following aqueous solution will conduct an electric current quite well [MP PMT 1987]

Answer»

Which of the following aqueous solution will conduct an electric current quite well

[MP PMT 1987]

Discussion

12942.	A solution in which some more solute can be dissolved at any fixed temperature is called a/an __ solution
Answer» A solution in which some more solute can be dissolved at any fixed temperature is called a/an __ solution

Discussion

12943.	Question 4 In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level? Grass → Grasshopper → Frog → Snake → Hawk (a) 5 k J (b) 50 k J (c) 500 k J (d) 5000 k J
Answer» Question 4 In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level? Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Hawk (a) 5 k J (b) 50 k J (c) 500 k J (d) 5000 k J

Discussion

12944.	The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :
Answer» The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :

Discussion

12945.	Calculate the number of atoms of each type in 5.3g of Na2CO3?
Answer» Calculate the number of atoms of each type in 5.3g of $N a_{2} C O_{3}$ ?

Discussion

12946.	Which of the following will oxidize sulphur directly to sulphuric acid?
Answer» Which of the following will oxidize sulphur directly to sulphuric acid?

Discussion

12947.	Question 8 The proper representation of a series combination of cells (Figure) obtaining maximum potential is (a) (i) (b) (ii) (c) (iii) (d) (iv)
Answer» Question 8 The proper representation of a series combination of cells (Figure) obtaining maximum potential is (a) (i) (b) (ii) (c) (iii) (d) (iv)

Discussion

12948.	Reaction of strong acid and weak base is required to form an acidic salt. How does ammonium sulphate and ammonium nitrate which are acidic salts formed ? i want to ask that what is the strong acid and weak base in the above examples
Answer» Reaction of strong acid and weak base is required to form an acidic salt. How does ammonium sulphate and ammonium nitrate which are acidic salts formed ? i want to ask that what is the strong acid and weak base in the above examples

Discussion

12949.	2NaOH + Zn gives you Na2ZnO2 + h2. Why??
Answer» 2NaOH + Zn gives you Na2ZnO2 + h2. Why??

Discussion

12950.	The first member of homologous series of ketones is:
Answer» The first member of homologous series of ketones is:

Discussion

Explore topic-wise InterviewSolutions in .

Dilute sulphuric acid is a good :

In the context of redox reactions, the removal of hydrogen from a substance is known as : (a) oxidation (b) dehydration (c) reduction (d) dehydrogenation

A colourless lead salt, when heated, produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.

What are the five uses of washing soda? [5 MARKS]

What are metalloids? Give two examples. [3 MARKS]

Which of the following is the common name of ethyne?

The root word for naming a hydrocarbon with 5 carbons is?

The standard reduction potentials, E∘, for the half-reactions are as Zn=Zn2++2e, E∘= + 0.76 V and Fe=Fe2++2e, E∘ = + 0.41 V. The e.m.f. for the cell reaction, Fe2++Zn=Zn2++Fe is

_________ can react with both acids and alkalis to give salt and water.Amphoteric Metal

write the name of ore for the following coups 1.sodium chloride 2.aluminium oxide 3.zince carbonate 4.copper sulphide 5 iron oxide 6.magnese dioxide

If pressure becomes double at the same absolute temperature on 2 L of CO2, then what will be the final volume of CO2?

Why is it so that the pillars near the qutub minar in Delhi is not corroded yet even though it's made up of iron

What is the formal charge on the starred oxygen atom?

Energy flow is ______.

Which of the following metals can't be used to make utensils?

What is a Functional group ?

Acids react with carbonates to give ___ as one of the products.

Pick the incorrect statement regarding ionic bonds.

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

Which of the following gas is released when Pb3O4 is heated?

what happens when: (i)dil.HCl is added to solid Na2CO3? (ii)quicklime is treated with water? (iii)sodium chloride solution is added to lead nitrate solution?

Which chemical process is used for obtaining a metal from its oxide? [3 MARKS]

What are the benefits of household waste water recycling systems?

What do you mean by recharging of the accumulator? What is the e.m.f of a freshly charged lead acid accumulator?

Which of the following is a use of an electrolytic decomposition reaction?

Which salt can be used to identify coloured cation qualitatively in inorganic chemistry?

(a) What are the following groups known as ? (i) Group 1 (ii) Group 17 (iii) Group 18 (b) Name two elements of each group.

Choose the incorrect statement regarding ethanol from the options given below.

The density of a gas at normal pressure and 27∘C temperature is 24 g/cc. Keeping the pressure constant, the density at 127∘C (in g/cc) will be

In the cyanide ion, the formal negative charge is on

Which of the following is an iron ore? (a) chnnabar (b) calamine (c) haematite (d) rock salt

CH3COOH+CH3CH2OH→CH3COOC2H5+H2O This reaction is called as ___ reaction.

The atomic number of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound? (a) P and R (b) Q and S (c) P and S (d) R and S

An element X is in group 2 of the periodic table : (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?

The hardness of water is due the presence of ___.

The total number of moles present in a gaseous mixture containing 8 g of oxygen, 11.2 litres of CO2 and 3 × 1022 molecules of N2 at STP is

Which acid is preferrably used in acidulating/acidifying water during the elctrolysis of water? Why? Explain in detail.

Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so ?

Why do soaps not work well with woolen clothes?

Which of the following aqueous solution will conduct an electric current quite well [MP PMT 1987]

A solution in which some more solute can be dissolved at any fixed temperature is called a/an __ solution

Question 4 In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level? Grass → Grasshopper → Frog → Snake → Hawk (a) 5 k J (b) 50 k J (c) 500 k J (d) 5000 k J

The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :

Calculate the number of atoms of each type in 5.3g of Na2CO3?

Which of the following will oxidize sulphur directly to sulphuric acid?

Question 8 The proper representation of a series combination of cells (Figure) obtaining maximum potential is (a) (i) (b) (ii) (c) (iii) (d) (iv)

Reaction of strong acid and weak base is required to form an acidic salt. How does ammonium sulphate and ammonium nitrate which are acidic salts formed ? i want to ask that what is the strong acid and weak base in the above examples

2NaOH + Zn gives you Na2ZnO2 + h2. Why??

The first member of homologous series of ketones is: