15280 + Interview Questions in Chemistry Page 244 InterviewSolution

12151.	Ethanoic acid turns blue litmus solution ............
Answer» Ethanoic acid turns blue litmus solution ............

Discussion

12152.	__ is the process of decomposition of a chemical compound in aqueous solutions or in molten state accompanied by the chemical change by using direct electric current.
Answer» __ is the process of decomposition of a chemical compound in aqueous solutions or in molten state accompanied by the chemical change by using direct electric current.

Discussion

12153.	What is meant by precipitation reaction
Answer» What is meant by precipitation reaction

Discussion

12154.	A salt of volatile acid X reacts with concentrated sulphuric acid to form sodium bisulphate and acetic acid. What is X?
Answer» A salt of volatile acid X reacts with concentrated sulphuric acid to form sodium bisulphate and acetic acid. What is X?

Discussion

12155.	sodium hydrogen carbonate is used in baking powder . during heating it decomposes to form sodium carbonate which has a soapy taste. how do baking powder manufacturers overcome this problem
Answer» sodium hydrogen carbonate is used in baking powder . during heating it decomposes to form sodium carbonate which has a soapy taste. how do baking powder manufacturers overcome this problem

Discussion

12156.	34 g of H2O is decomposed to _______ g of hydrogen and ____ g of oxygen.
Answer» 34 g of $H_{2} O$ is decomposed to _______ g of hydrogen and ____ g of oxygen.

Discussion

12157.	The most ductile metal is:
Answer» The most ductile metal is:

Discussion

12158.	A wave has a frequency of 3 × 1015 Sec−1.The energy of that photon is
Answer» A wave has a frequency of $3 \times 10^{15} S e c^{- 1}$ .The energy of that photon is

Discussion

12159.	The electronic configuration of four elements are given below. Which elements does not belong to same family as others?
Answer» The electronic configuration of four elements are given below. Which elements does not belong to same family as others?

12159.

The electronic configuration of four elements are given below. Which elements does not belong to same family as others?

Answer»

The electronic configuration of four elements are given below.

Which elements does not belong to same family as others?

Discussion

12160.	The magnitude of the surface tension of a liquid depends on:
Answer» The magnitude of the surface tension of a liquid depends on:

Discussion

12161.	We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realize that the improper disposal of waste is harmful to the environment.
Answer» We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realize that the improper disposal of waste is harmful to the environment.

Discussion

12162.	Elements of Group 16 have 6 valence electrons. The valency of Group 16 elements is:
Answer» Elements of Group 16 have 6 valence electrons. The valency of Group 16 elements is:

Discussion

12163.	What is the mass of 4.82×1025 molecules of H2O in grams?
Answer» What is the mass of $4.82 \times 10^{25}$ molecules of $H_{2} O$ in grams?

Discussion

12164.	The mass of 5000 ml of NH3 gas at STP is
Answer» The mass of 5000 ml of $N H_{3}$ gas at STP is

Discussion

12165.	Find the odd one out (valency is not a criterion).
Answer» Find the odd one out (valency is not a criterion).

Discussion

12166.	Which of the following has the highest percentage of ionic character?
Answer» Which of the following has the highest percentage of ionic character?

Discussion

12167.	(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ? (b) Name the other ion formed when ammonia dissolves in water. (c) Give one test that can be used to detect the presence of the ion produced in (b).
Answer» (a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ? (b) Name the other ion formed when ammonia dissolves in water. (c) Give one test that can be used to detect the presence of the ion produced in (b).

12167.

(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ? (b) Name the other ion formed when ammonia dissolves in water. (c) Give one test that can be used to detect the presence of the ion produced in (b).

Answer»

(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ?

(b) Name the other ion formed when ammonia dissolves in water.

(c) Give one test that can be used to detect the presence of the ion produced in (b).

Discussion

12168.	How are most of the solid wastes in urban areas disposed of is it used?
Answer» How are most of the solid wastes in urban areas disposed of is it used?

Discussion

12169.	What is a symbol? What information does it convey?
Answer» What is a symbol? What information does it convey?

Discussion

12170.	A compound X consists fo 4.8 % carbon and 95.2 % bromine by mass: (i) Determine the empirical formula of this compound working correctly to one decimal place (C = 12; Br = 80). (ii) If the vapour density of the compound is 252, what is the molecular formula of the compound?
Answer» A compound X consists fo 4.8 % carbon and 95.2 % bromine by mass: (i) Determine the empirical formula of this compound working correctly to one decimal place (C = 12; Br = 80). (ii) If the vapour density of the compound is 252, what is the molecular formula of the compound?

Discussion

12171.	The pipelines under the surface of earth are protected from corrosion by connecting them to a more reactive metal Mg or Zn which is buried in the earth and connected to the pipelines by wire.Can't
Answer» The pipelines under the surface of earth are protected from corrosion by connecting them to a more reactive metal Mg or Zn which is buried in the earth and connected to the pipelines by wire.Can't

Discussion

12172.	What is the source of an EM wave?
Answer» What is the source of an EM wave?

Discussion

12173.	A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reactions is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are:
Answer» A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reactions is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are:

Discussion

12174.	The element with a controversial placement in the modern periodic table is __.
Answer» The element with a controversial placement in the modern periodic table is __.

Discussion

12175.	Define : (a) Soft water (b) Hard water
Answer» Define : (a) Soft water (b) Hard water

12175.

Define : (a) Soft water (b) Hard water

Answer»

Define :

(a) Soft water

(b) Hard water

Discussion

12176.	Out of O16 and O18 isotopes, which has more number of neutrons?
Answer» Out of $O^{16}$ and $O^{18}$ isotopes, which has more number of neutrons?

Discussion

12177.	The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?
Answer» The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

12177.

The second step in the production of sulphuric acid(contact process) is given by the equation: $2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$ Ideally, which conditions would increase the yield of this reaction?

Answer»

The second step in the production of sulphuric acid(contact process) is given by the equation:

$2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$

Ideally, which conditions would increase the yield of this reaction?

Discussion

12178.	Question 1 (c) Fill in the blanks: (c) The stomach releases hydrochloric acid and __ juices which act on food.
Answer» Question 1 (c) Fill in the blanks: (c) The stomach releases hydrochloric acid and __ juices which act on food.

Discussion

12179.	Why do oily and fatty food become inedible when kept out for too long?
Answer» Why do oily and fatty food become inedible when kept out for too long?

Discussion

12180.	Calculate n-factor of Na3PO4 in the following reaction. Na3PO4+3BaCl2 → 6NaCl+Ba3(PO4)2
Answer» Calculate n-factor of $N a_{3} P O_{4}$ in the following reaction. $N a_{3} P O_{4} + 3 B a C l_{2} \to 6 N a C l + B a_{3} (P O_{4})_{2}$

12180.

Calculate n-factor of Na3PO4 in the following reaction. Na3PO4+3BaCl2 → 6NaCl+Ba3(PO4)2

Answer»

Calculate n-factor of $N a_{3} P O_{4}$ in the following reaction.

$N a_{3} P O_{4} + 3 B a C l_{2} \to 6 N a C l + B a_{3} (P O_{4})_{2}$

Discussion

12181.	Give th empirical formula of: (a) C6H6, (b) C6H12O6, (C)C2H2, (d) CH3COOH.
Answer» Give th empirical formula of: (a) $C_{6} H_{6},$ (b) $C_{6} H_{12} O_{6},$ (C) $C_{2} H_{2},$ (d) $C H_{3} C O O H .$

Discussion

12182.	Question 51 Give two examples each of the metals that are good conductors and poor conductors of heat respectively.
Answer» Question 51 Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

Discussion

12183.	What is the chemical formula of sodium hydroxide? What are its uses?
Answer» What is the chemical formula of sodium hydroxide? What are its uses?

Discussion

12184.	Match the following: Reaction NamesReactionsiDisplacement reactionA.CaO+O2→2Ca(OH)2iiDecomposition ReactionB.Fe+Pb(NO3)2→Fe(NO3)2+PbiiiRedox ReactionC.MgCl2+Ca(OH)2→Mg(OH)2+CaCl2ivCombination ReactionD.KClO3→2KCl+3O2vDouble Displacement ReactionE.CO2+H2→2CO+H2O
Answer» Match the following: $\begin{matrix} Reaction Names & Reactions i & Displacement reaction & A . C a O + O_{2} \to 2 C a (O H)_{2} ii & Decomposition Reaction & B . F e + P b (N O_{3})_{2} \to F e (N O_{3})_{2} + P b iii & Redox Reaction & C . M g C l_{2} + C a (O H)_{2} \to M g (O H)_{2} + C a C l_{2} iv & Combination Reaction & D . K C l O_{3} \to 2 K C l + 3 O_{2} v & Double Displacement Reaction & E . C O_{2} + H_{2} \to 2 C O + H_{2} O \end{matrix}$

12184.

Match the following: Reaction NamesReactionsiDisplacement reactionA.CaO+O2→2Ca(OH)2iiDecomposition ReactionB.Fe+Pb(NO3)2→Fe(NO3)2+PbiiiRedox ReactionC.MgCl2+Ca(OH)2→Mg(OH)2+CaCl2ivCombination ReactionD.KClO3→2KCl+3O2vDouble Displacement ReactionE.CO2+H2→2CO+H2O

Answer»

Match the following:

$\begin{matrix} Reaction Names & Reactions i & Displacement reaction & A . C a O + O_{2} \to 2 C a (O H)_{2} ii & Decomposition Reaction & B . F e + P b (N O_{3})_{2} \to F e (N O_{3})_{2} + P b iii & Redox Reaction & C . M g C l_{2} + C a (O H)_{2} \to M g (O H)_{2} + C a C l_{2} iv & Combination Reaction & D . K C l O_{3} \to 2 K C l + 3 O_{2} v & Double Displacement Reaction & E . C O_{2} + H_{2} \to 2 C O + H_{2} O \end{matrix}$

Discussion

12185.	What change in colour is observed when white silver chloride is left exposed to sun light,state the type of chemical reaction in this change
Answer» What change in colour is observed when white silver chloride is left exposed to sun light,state the type of chemical reaction in this change

Discussion

12186.	We know that antioxidants are required by the body to prevent oxidation. My question is that what do they prevent from oxidation and how?
Answer» We know that antioxidants are required by the body to prevent oxidation. My question is that what do they prevent from oxidation and how?

Discussion

12187.	Which of the following is an example of non-aqueous solution?
Answer» Which of the following is an example of non-aqueous solution?

Discussion

12188.	Balance the following chemical equation : MnO2+HCl→MnCl2+Cl2+H2O
Answer» Balance the following chemical equation : $M n O_{2} + H C l \to M n C l_{2} + C l_{2} + H_{2} O$

Discussion

12189.	Hydrides are classified as:
Answer» Hydrides are classified as:

Discussion

12190.	The reaction in which oxidising agents supply nascent oxygen for oxidation of alcohols to their respective acids is known as:
Answer» The reaction in which oxidising agents supply nascent oxygen for oxidation of alcohols to their respective acids is known as:

Discussion

12191.	A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after 15 minutes, its surface was found to be coated with a silvery grey deposit. From the above observation, it can be concluded that:
Answer» A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after 15 minutes, its surface was found to be coated with a silvery grey deposit. From the above observation, it can be concluded that:

Discussion

12192.	Sulphur trioxide is dissolved in sulphuric acid and not in water because :
Answer» Sulphur trioxide is dissolved in sulphuric acid and not in water because :

Discussion

12193.	Which of the following salt is basic in nature?
Answer» Which of the following salt is basic in nature?

Discussion

12194.	Why metallic character decreases across a period and increases down a group?
Answer» Why metallic character decreases across a period and increases down a group?

Discussion

12195.	What is electrovalent compound? What is covalent compound? What is coordinate bond?
Answer» What is electrovalent compound? What is covalent compound? What is coordinate bond?

12195.

What is electrovalent compound? What is covalent compound? What is coordinate bond?

Answer»

What is electrovalent compound?

What is covalent compound?

What is coordinate bond?

Discussion

12196.	Consider the following organic compounds : CH3OH, C2H5OH, CH3COCH3 CH3COOH, C2H5COOH C4H9COOC2H5 CH4 C2H6 CH3CHO HCHO Out of these compounds : (a) Which compound is most likely to be sweet-smelling ? (b) Which compound on treatment with conc. H2SO4 at 170oC forms an alkene ? (c) Which compound on repeated chlorination forms chloroform ? (d) which compound is added to alcohol to denature it ? (e) Which compound is a constituent of vinegar ? (f) Which compound is used to sterilise wounds and syringes ?
Answer» Consider the following organic compounds : $C H_{3} O H, C_{2} H_{5} O H, C H_{3} C O C H_{3} C H_{3} C O O H, C_{2} H_{5} C O O H C_{4} H_{9} C O O C_{2} H_{5} C H_{4} C_{2} H_{6} C H_{3} C H O H C H O$ Out of these compounds : (a) Which compound is most likely to be sweet-smelling ? (b) Which compound on treatment with conc. $H_{2} S O_{4}$ at $170^{o} C$ forms an alkene ? (c) Which compound on repeated chlorination forms chloroform ? (d) which compound is added to alcohol to denature it ? (e) Which compound is a constituent of vinegar ? (f) Which compound is used to sterilise wounds and syringes ?

12196.

Consider the following organic compounds : CH3OH, C2H5OH, CH3COCH3 CH3COOH, C2H5COOH C4H9COOC2H5 CH4 C2H6 CH3CHO HCHO Out of these compounds : (a) Which compound is most likely to be sweet-smelling ? (b) Which compound on treatment with conc. H2SO4 at 170oC forms an alkene ? (c) Which compound on repeated chlorination forms chloroform ? (d) which compound is added to alcohol to denature it ? (e) Which compound is a constituent of vinegar ? (f) Which compound is used to sterilise wounds and syringes ?

Answer»

Consider the following organic compounds :

$C H_{3} O H, C_{2} H_{5} O H, C H_{3} C O C H_{3} C H_{3} C O O H, C_{2} H_{5} C O O H C_{4} H_{9} C O O C_{2} H_{5} C H_{4} C_{2} H_{6} C H_{3} C H O H C H O$

Out of these compounds :

(a) Which compound is most likely to be sweet-smelling ?

(b) Which compound on treatment with conc. $H_{2} S O_{4}$ at $170^{o} C$ forms an alkene ?

(c) Which compound on repeated chlorination forms chloroform ?

(d) which compound is added to alcohol to denature it ?

(e) Which compound is a constituent of vinegar ?

(f) Which compound is used to sterilise wounds and syringes ?

Discussion

12197.	Sulphuric acid is called the "king of chemicals". Give four points in support of this statement. [4 MARKS]
Answer» Sulphuric acid is called the "king of chemicals". Give four points in support of this statement. [4 MARKS]

Discussion

12198.	NH3 and H2O are amphoteric oxides. How can you say so ??
Answer» NH₃and H₂O are amphoteric oxides. How can you say so ??

Discussion

12199.	Biotic and Abiotic factors are related to each other by______Ecosystem
Answer» Biotic and Abiotic factors are related to each other by______ Ecosystem

12199.

Biotic and Abiotic factors are related to each other by______Ecosystem

Answer»

Biotic and Abiotic factors are related to each other by______

Ecosystem

Discussion

12200.	Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:
Answer» Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:

Discussion

Explore topic-wise InterviewSolutions in .

Ethanoic acid turns blue litmus solution ............

__ is the process of decomposition of a chemical compound in aqueous solutions or in molten state accompanied by the chemical change by using direct electric current.

What is meant by precipitation reaction

A salt of volatile acid X reacts with concentrated sulphuric acid to form sodium bisulphate and acetic acid. What is X?

sodium hydrogen carbonate is used in baking powder . during heating it decomposes to form sodium carbonate which has a soapy taste. how do baking powder manufacturers overcome this problem

34 g of H2O is decomposed to _______ g of hydrogen and ____ g of oxygen.

The most ductile metal is:

A wave has a frequency of 3 × 1015 Sec−1.The energy of that photon is

The electronic configuration of four elements are given below. Which elements does not belong to same family as others?

The magnitude of the surface tension of a liquid depends on:

We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realize that the improper disposal of waste is harmful to the environment.

Elements of Group 16 have 6 valence electrons. The valency of Group 16 elements is:

What is the mass of 4.82×1025 molecules of H2O in grams?

The mass of 5000 ml of NH3 gas at STP is

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

Which of the following has the highest percentage of ionic character?

(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ? (b) Name the other ion formed when ammonia dissolves in water. (c) Give one test that can be used to detect the presence of the ion produced in (b).

How are most of the solid wastes in urban areas disposed of is it used?

What is a symbol? What information does it convey?

A compound X consists fo 4.8 % carbon and 95.2 % bromine by mass: (i) Determine the empirical formula of this compound working correctly to one decimal place (C = 12; Br = 80). (ii) If the vapour density of the compound is 252, what is the molecular formula of the compound?

The pipelines under the surface of earth are protected from corrosion by connecting them to a more reactive metal Mg or Zn which is buried in the earth and connected to the pipelines by wire.Can't

What is the source of an EM wave?

The element with a controversial placement in the modern periodic table is __.

Define : (a) Soft water (b) Hard water

Out of O16 and O18 isotopes, which has more number of neutrons?

The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

Question 1 (c) Fill in the blanks: (c) The stomach releases hydrochloric acid and __ juices which act on food.

Why do oily and fatty food become inedible when kept out for too long?

Calculate n-factor of Na3PO4 in the following reaction. Na3PO4+3BaCl2 → 6NaCl+Ba3(PO4)2

Give th empirical formula of: (a) C6H6, (b) C6H12O6, (C)C2H2, (d) CH3COOH.

Question 51 Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

What is the chemical formula of sodium hydroxide? What are its uses?

Match the following: Reaction NamesReactionsiDisplacement reactionA.CaO+O2→2Ca(OH)2iiDecomposition ReactionB.Fe+Pb(NO3)2→Fe(NO3)2+PbiiiRedox ReactionC.MgCl2+Ca(OH)2→Mg(OH)2+CaCl2ivCombination ReactionD.KClO3→2KCl+3O2vDouble Displacement ReactionE.CO2+H2→2CO+H2O

What change in colour is observed when white silver chloride is left exposed to sun light,state the type of chemical reaction in this change

We know that antioxidants are required by the body to prevent oxidation. My question is that what do they prevent from oxidation and how?

Which of the following is an example of non-aqueous solution?

Balance the following chemical equation : MnO2+HCl→MnCl2+Cl2+H2O

Hydrides are classified as:

The reaction in which oxidising agents supply nascent oxygen for oxidation of alcohols to their respective acids is known as:

A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after 15 minutes, its surface was found to be coated with a silvery grey deposit. From the above observation, it can be concluded that:

Sulphur trioxide is dissolved in sulphuric acid and not in water because :

Which of the following salt is basic in nature?

Why metallic character decreases across a period and increases down a group?

What is electrovalent compound? What is covalent compound? What is coordinate bond?

Sulphuric acid is called the "king of chemicals". Give four points in support of this statement. [4 MARKS]

NH3 and H2O are amphoteric oxides. How can you say so ??

Biotic and Abiotic factors are related to each other by______Ecosystem

Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:

34 g of H2O is decomposed to ___ g of hydrogen and g of oxygen.