15280 + Interview Questions in Chemistry Page 3 InterviewSolution

101.	Why does long standing concentrated solutions of alkali metals in liquid ammonia show bronze colour and become diamagnetic?Explain in detail.Does the same happen incase of alkaline earth metals as well?
Answer» Why does long standing concentrated solutions of alkali metals in liquid ammonia show bronze colour and become diamagnetic?Explain in detail.Does the same happen incase of alkaline earth metals as well?

Discussion

102.	70 Why graphite and diamond are anisotropic?
Answer» 70 Why graphite and diamond are anisotropic?

Discussion

103.	Why should the ore be concentrated? Give reason.
Answer» Why should the ore be concentrated? Give reason.

Discussion

104.	Which one of these ions absorbs energy from visible spectrum :- (1) [Cu(NH3)4]^+ (2) [Cu(NH3)4]^+2 (3) [Zn(H2O)6]^+2 (4) [Co(H2O)6]^+3
Answer» Which one of these ions absorbs energy from visible spectrum :- (1) [Cu(NH3)4]^+ (2) [Cu(NH3)4]^+2 (3) [Zn(H2O)6]^+2 (4) [Co(H2O)6]^+3

Discussion

105.	An element P belongs to group 15. Its one of the allotrope is used in match box. It does not reacts with dil.H2SO4. It forms two oxides X and Y which turn blue litmus red. Identify P, X and Y. Write the reaction of P to form X and Y.
Answer» An element P belongs to group 15. Its one of the allotrope is used in match box. It does not reacts with dil.H2SO4. It forms two oxides X and Y which turn blue litmus red. Identify P, X and Y. Write the reaction of P to form X and Y.

Discussion

106.	One mole of oxygen molecule have
Answer» One mole of oxygen molecule have

Discussion

107.	Which atom is balanced in the given equation? 4P + O2 → 2P2O5
Answer» Which atom is balanced in the given equation? 4P + O₂ → 2P₂O₅

107.

Which atom is balanced in the given equation? 4P + O2 → 2P2O5

Answer»

Which atom is balanced in the given equation?

4P + O₂ → 2P₂O₅

Discussion

108.	Find reactions showing redox change(A) Fe2(SO4)3 (B) (NH4)2Cr2O7 (C) CaCO3 (D) NH4Cl (E) NH4NO3 (F) LiNO3 (G) AgNO3 (All heated i.e. undergoing decomposition) (1)A, B, E, F(2)B, E, F(3)B, E, F, G(4)B, D, E, F
Answer» Find reactions showing redox change (A) Fe2(SO4)3 (B) (NH4)2Cr2O7 (C) CaCO3 (D) NH4Cl (E) NH4NO3 (F) LiNO3 (G) AgNO3 (All heated i.e. undergoing decomposition) (1)A, B, E, F (2)B, E, F (3)B, E, F, G (4)B, D, E, F

Discussion

109.	Aditya remembered that sodium shouldn’t be stored in water and so he used ethanol to store sodium. He observed sodium disappearing to give a yellow powder. What is the yellow powder?
Answer» Aditya remembered that sodium shouldn’t be stored in water and so he used ethanol to store sodium. He observed sodium disappearing to give a yellow powder. What is the yellow powder?

Discussion

110.	What is the maximum number of electrons whichcan be accommodated in an atom in which thehighest principal quantum number value is 4(1) 10 (2) 18 ( 3) 36(4) 54
Answer» What is the maximum number of electrons whichcan be accommodated in an atom in which thehighest principal quantum number value is 4(1) 10 (2) 18 ( 3) 36(4) 54

Discussion

111.	(a) Show on a diagram the transfer of electrons between the atoms in the formation of MgO.(b) Name the solvent in which ionic compounds are generally soluble.(c) Why are aqueous solutions of ionic compounds able to conduct electricity?
Answer» (a) Show on a diagram the transfer of electrons between the atoms in the formation of MgO. (b) Name the solvent in which ionic compounds are generally soluble. (c) Why are aqueous solutions of ionic compounds able to conduct electricity?

Discussion

112.	Which of the following has higher melting point? (i) Sugar (ii) Salt
Answer» Which of the following has higher melting point? (i) Sugar (ii) Salt

112.

Which of the following has higher melting point? (i) Sugar (ii) Salt

Answer»

Which of the following has higher melting point?

(i) Sugar (ii) Salt

Discussion

113.	Correct the following statement:Hydrochloric acid is prepared in the laboratory by passing hydrogen chloride directly through water.
Answer» Correct the following statement: Hydrochloric acid is prepared in the laboratory by passing hydrogen chloride directly through water.

Discussion

114.	Which of the following metal strips when placed in colourless AgNO3 solution, turns the solution blue?(1) Fe(2) Cu(3) Mg(4) Zn
Answer» Which of the following metal strips when placed in colourless AgNO₃ solution, turns the solution blue? (1) Fe (2) Cu (3) Mg (4) Zn

Discussion

115.	How does a galvanic cell produce electricity?
Answer» How does a galvanic cell produce electricity?

Discussion

116.	Which of the following ions contains minimum number of unpaired electrons? 1. Fe2+ 2. Fe3+ 3. Co2+ 4 .Co3+
Answer» Which of the following ions contains minimum number of unpaired electrons? 1. Fe2+ 2. Fe3+ 3. Co2+ 4 .Co3+

Discussion

117.	The electrons present in the outermost shell are known as ___.
Answer» The electrons present in the outermost shell are known as ___.

Discussion

118.	The atomic weight of a metal is 27 and its equivalent weight is 9 ,the formula of its chloride will be:
Answer» The atomic weight of a metal is 27 and its equivalent weight is 9 ,the formula of its chloride will be:

Discussion

119.	why does corrosion happens layer by layer ?
Answer» why does corrosion happens layer by layer ?

Discussion

120.	How many litres of O2 at STP are needed for the complete combustion of 40 g of liquid hexane?
Answer» How many litres of $O_{2}$ at STP are needed for the complete combustion of $40 g$ of liquid hexane?

Discussion

121.	E∘Ag+\|Ag=0.8 volt and E∘Zn2+\|Zn=−0.76 volt Which of the following is correct?
Answer» $E_{A g^{+} \| A g}^{\circ} = 0.8$ volt and $E_{Z n^{2 +} \| Z n}^{\circ} = - 0.76$ volt Which of the following is correct?

Discussion

122.	State the reason why baking soda is used following cases: as an antacid. as a constituent of baking powder.
Answer» State the reason why baking soda is used following cases: as an antacid. as a constituent of baking powder.

Discussion

123.	A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z. (a) What could metal X be ? (b) What is power Y ? (c) With which substance metal X combines to form powder Y ? (d) What is substance Z ? Name one domestic use of substance Z. (e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.
Answer» A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z. (a) What could metal X be ? (b) What is power Y ? (c) With which substance metal X combines to form powder Y ? (d) What is substance Z ? Name one domestic use of substance Z. (e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.

123.

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z. (a) What could metal X be ? (b) What is power Y ? (c) With which substance metal X combines to form powder Y ? (d) What is substance Z ? Name one domestic use of substance Z. (e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.

Answer»

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z.

(a) What could metal X be ?

(b) What is power Y ?

(c) With which substance metal X combines to form powder Y ?

(d) What is substance Z ? Name one domestic use of substance Z.

(e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.

Discussion

124.	Define the term catenation.
Answer» Define the term catenation.

Discussion

125.	Question 44(b) The following reaction takes place when aluminium powder is heated with MnO2: 3MnO2(s)+4Al (s)→3Mn (l)+2Al2O3(l)+Heat Is MnO2 getting oxidised?
Answer» Question 44(b) The following reaction takes place when aluminium powder is heated with ${MnO}_{2}$ : $3 {MnO}_{2} (s) + 4 Al (s) \to 3 Mn (l) + 2 {Al}_{2} O_{3} (l) + Heat$ Is ${MnO}_{2}$ getting oxidised?

Discussion

126.	Volume of H2 when 0.9g AL reacts with dil. Hcl
Answer» Volume of H2 when 0.9g AL reacts with dil. Hcl

Discussion

127.	The balanced equation for the reaction Fe+HNO3 very dilute→ is:
Answer» The balanced equation for the reaction $F e + H N O_{3} very dilute \to$ is:

Discussion

128.	Match the following salts with their formulae.
Answer» Match the following salts with their formulae.

Discussion

129.	X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:(a) If X is a metal, then the litmus will turn ___________.(b) If X is a non-metal, then the litmus will turn _________.(c) If X is a reactive metal, then _________ will be evolved, when X reacts with dilute sulphuric acid.(d) If X is a non-metal, it will form _________ oxide, which will form _________ solution with water.(e) If X is a non-metal, it will not conduct electricity unless it is carbon in the form of _________.
Answer» X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences: (a) If X is a metal, then the litmus will turn ___________. (b) If X is a non-metal, then the litmus will turn _________. (c) If X is a reactive metal, then _________ will be evolved, when X reacts with dilute sulphuric acid. (d) If X is a non-metal, it will form _________ oxide, which will form _________ solution with water. (e) If X is a non-metal, it will not conduct electricity unless it is carbon in the form of _________.

Discussion

130.	The permissible settlement of an isolated foundation on a granular soil is 40 mm. A plate load test is performed with 300 mm square plate undergoing a settlement of 20 mm under the same load intensity. The ultimate bearing capacity of soil with plate is 25t/m2. The ultimate bearing capacity of soil for foundation will be t/m260.42
Answer» The permissible settlement of an isolated foundation on a granular soil is 40 mm. A plate load test is performed with 300 mm square plate undergoing a settlement of 20 mm under the same load intensity. The ultimate bearing capacity of soil with plate is $25 t / m^{2}$ . The ultimate bearing capacity of soil for foundation will be $t / m^{2}$ 60.42

130.

The permissible settlement of an isolated foundation on a granular soil is 40 mm. A plate load test is performed with 300 mm square plate undergoing a settlement of 20 mm under the same load intensity. The ultimate bearing capacity of soil with plate is 25t/m2. The ultimate bearing capacity of soil for foundation will be t/m260.42

Answer»

The permissible settlement of an isolated foundation on a granular soil is 40 mm. A plate load test is performed with 300 mm square plate undergoing a settlement of 20 mm under the same load intensity. The ultimate bearing capacity of soil with plate is $25 t / m^{2}$ . The ultimate bearing capacity of soil for foundation will be $t / m^{2}$

60.42

Discussion

131.	hypervalent compound
Answer» hypervalent compound

Discussion

132.	Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.
Answer» Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

Discussion

133.	which of the following does not give yellow precipitate with AgNO3(CH3)3C-CH2ICH2=CH-CH2-ICH2=C(I)CH3
Answer» which of the following does not give yellow precipitate with AgNO3 (CH3)3C-CH2I CH2=CH-CH2-I CH2=C(I)CH3

Discussion

134.	The radius of nucleus is approximately times smaller than the radius of atom
Answer» The radius of nucleus is approximately times smaller than the radius of atom

Discussion

135.	An aqueous solution of metal bromide MBr2 (0.05 M) is saturated with H2S. The minimum pH at which MS will precipitate will be:Ksp(MS)=6×10−21Concentration of saturated H2S=0.1 MKa1(H2S)=1×10−7Ka2(H2S)=1.3×10−13
Answer» An aqueous solution of metal bromide $M B r_{2} (0.05 M)$ is saturated with $H_{2} S$ . The minimum $p H$ at which $M S$ will precipitate will be: $K_{s p} (M S) = 6 \times 10^{- 21}$ Concentration of saturated $H_{2} S = 0.1 M$ $K a_{1} (H_{2} S) = 1 \times 10^{- 7}$ $K a_{2} (H_{2} S) = 1.3 \times 10^{- 13}$

Discussion

136.	Write the balanced chemical equation for the following reaction.Lead nitrate + Magnesium → Magnesium nitrate + Lead
Answer» Write the balanced chemical equation for the following reaction. Lead nitrate + Magnesium $\to$ Magnesium nitrate + Lead

136.

Write the balanced chemical equation for the following reaction.Lead nitrate + Magnesium → Magnesium nitrate + Lead

Answer»

Write the balanced chemical equation for the following reaction.

Lead nitrate + Magnesium $\to$ Magnesium nitrate + Lead

Discussion

137.	A substance which has very low ignition temperature and can easily catch fire with a flame is called _________.
Answer» A substance which has very low ignition temperature and can easily catch fire with a flame is called _________.

Discussion

138.	Arrange single, double and triple bonds in decreasing order of their bond strengths.
Answer» Arrange single, double and triple bonds in decreasing order of their bond strengths.

Discussion

139.	80. Avogadro's number of oxygen atom weights A)32g B)8g C)56g D)16g
Answer» 80. Avogadro's number of oxygen atom weights A)32g B)8g C)56g D)16g

Discussion

140.	what is hydrogeneration and explain its industrial application
Answer» what is hydrogeneration and explain its industrial application

Discussion

141.	Write the formulae of the compounds and name the functional groups present in each of them: (i) Ethanoic acid (ii) Propanone (iii) Nitromethane
Answer» Write the formulae of the compounds and name the functional groups present in each of them: (i) Ethanoic acid (ii) Propanone (iii) Nitromethane

141.

Write the formulae of the compounds and name the functional groups present in each of them: (i) Ethanoic acid (ii) Propanone (iii) Nitromethane

Answer»

Write the formulae of the compounds and name the functional groups present in each of them:
(i) Ethanoic acid

(ii) Propanone

(iii) Nitromethane

Discussion

142.	Calculate Molality of a solution in which 36 gm glucose is dissolved in 500 gm water.
Answer» Calculate Molality of a solution in which 36 gm glucose is dissolved in 500 gm water.

Discussion

143.	The order of basic character of given oxides is:
Answer» The order of basic character of given oxides is:

Discussion

144.	36.Last electron in the O=O- during the change from O2 to O2- ion is added in. a) sigma b) pi c) pi* d) sigma *
Answer» 36.Last electron in the O=O- during the change from O2 to O2- ion is added in. a) sigma b) pi c) pi* d) sigma *

Discussion

145.	Calculate the number of moles and mass of methane required to produce 11g of co2 by combustion
Answer» Calculate the number of moles and mass of methane required to produce 11g of co2 by combustion

Discussion

146.	Write equation for the reaction that will take place when copper sulphate solution is added to sodium hydroxide solution.
Answer» Write equation for the reaction that will take place when copper sulphate solution is added to sodium hydroxide solution.

Discussion

147.	(i) In the combination reaction of adding water to quick lime, name the product formed and write its colour. (ii) While studying the decompostion reaction, by heating anhydrous ferrous sulphate crystals in a test-tube, a product is formed in the test-tube. Name the product and write its colour.
Answer» (i) In the combination reaction of adding water to quick lime, name the product formed and write its colour. (ii) While studying the decompostion reaction, by heating anhydrous ferrous sulphate crystals in a test-tube, a product is formed in the test-tube. Name the product and write its colour.

Discussion

148.	8.Avg Formal charge in nitrate on each oxygen atom
Answer» 8.Avg Formal charge in nitrate on each oxygen atom

Discussion

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

149.

The IUPAC name of the given compound is

Answer»

The IUPAC name of the given compound is

Discussion

150.	Which of the following resonanting structures of 1-methoxy-1,3-butadiene is least stable?
Answer» Which of the following resonanting structures of 1-methoxy-1,3-butadiene is least stable?

Discussion

Explore topic-wise InterviewSolutions in .

Why does long standing concentrated solutions of alkali metals in liquid ammonia show bronze colour and become diamagnetic?Explain in detail.Does the same happen incase of alkaline earth metals as well?

70 Why graphite and diamond are anisotropic?

Why should the ore be concentrated? Give reason.

Which one of these ions absorbs energy from visible spectrum :- (1) [Cu(NH3)4]^+ (2) [Cu(NH3)4]^+2 (3) [Zn(H2O)6]^+2 (4) [Co(H2O)6]^+3

An element P belongs to group 15. Its one of the allotrope is used in match box. It does not reacts with dil.H2SO4. It forms two oxides X and Y which turn blue litmus red. Identify P, X and Y. Write the reaction of P to form X and Y.

One mole of oxygen molecule have

Which atom is balanced in the given equation? 4P + O2 → 2P2O5

Find reactions showing redox change(A) Fe2(SO4)3 (B) (NH4)2Cr2O7 (C) CaCO3 (D) NH4Cl (E) NH4NO3 (F) LiNO3 (G) AgNO3 (All heated i.e. undergoing decomposition) (1)A, B, E, F(2)B, E, F(3)B, E, F, G(4)B, D, E, F

Aditya remembered that sodium shouldn’t be stored in water and so he used ethanol to store sodium. He observed sodium disappearing to give a yellow powder. What is the yellow powder?

What is the maximum number of electrons whichcan be accommodated in an atom in which thehighest principal quantum number value is 4(1) 10 (2) 18 ( 3) 36(4) 54

(a) Show on a diagram the transfer of electrons between the atoms in the formation of MgO.(b) Name the solvent in which ionic compounds are generally soluble.(c) Why are aqueous solutions of ionic compounds able to conduct electricity?

Which of the following has higher melting point? (i) Sugar (ii) Salt

Correct the following statement:Hydrochloric acid is prepared in the laboratory by passing hydrogen chloride directly through water.

Which of the following metal strips when placed in colourless AgNO3 solution, turns the solution blue?(1) Fe(2) Cu(3) Mg(4) Zn

How does a galvanic cell produce electricity?

Which of the following ions contains minimum number of unpaired electrons? 1. Fe2+ 2. Fe3+ 3. Co2+ 4 .Co3+

The electrons present in the outermost shell are known as ___.

The atomic weight of a metal is 27 and its equivalent weight is 9 ,the formula of its chloride will be:

why does corrosion happens layer by layer ?

How many litres of O2 at STP are needed for the complete combustion of 40 g of liquid hexane?

E∘Ag+|Ag=0.8 volt and E∘Zn2+|Zn=−0.76 volt Which of the following is correct?

State the reason why baking soda is used following cases: as an antacid. as a constituent of baking powder.

Define the term catenation.

Question 44(b) The following reaction takes place when aluminium powder is heated with MnO2: 3MnO2(s)+4Al (s)→3Mn (l)+2Al2O3(l)+Heat Is MnO2 getting oxidised?

Volume of H2 when 0.9g AL reacts with dil. Hcl

The balanced equation for the reaction Fe+HNO3 very dilute→ is:

Match the following salts with their formulae.

hypervalent compound

Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

which of the following does not give yellow precipitate with AgNO3(CH3)3C-CH2ICH2=CH-CH2-ICH2=C(I)CH3

The radius of nucleus is approximately times smaller than the radius of atom

An aqueous solution of metal bromide MBr2 (0.05 M) is saturated with H2S. The minimum pH at which MS will precipitate will be:Ksp(MS)=6×10−21Concentration of saturated H2S=0.1 MKa1(H2S)=1×10−7Ka2(H2S)=1.3×10−13

Write the balanced chemical equation for the following reaction.Lead nitrate + Magnesium → Magnesium nitrate + Lead

A substance which has very low ignition temperature and can easily catch fire with a flame is called _________.

Arrange single, double and triple bonds in decreasing order of their bond strengths.

80. Avogadro's number of oxygen atom weights A)32g B)8g C)56g D)16g

what is hydrogeneration and explain its industrial application

Write the formulae of the compounds and name the functional groups present in each of them: (i) Ethanoic acid (ii) Propanone (iii) Nitromethane

Calculate Molality of a solution in which 36 gm glucose is dissolved in 500 gm water.

The order of basic character of given oxides is:

36.Last electron in the O=O- during the change from O2 to O2- ion is added in. a) sigma b) pi c) pi* d) sigma *

Calculate the number of moles and mass of methane required to produce 11g of co2 by combustion

Write equation for the reaction that will take place when copper sulphate solution is added to sodium hydroxide solution.

(i) In the combination reaction of adding water to quick lime, name the product formed and write its colour. (ii) While studying the decompostion reaction, by heating anhydrous ferrous sulphate crystals in a test-tube, a product is formed in the test-tube. Name the product and write its colour.

8.Avg Formal charge in nitrate on each oxygen atom

The IUPAC name of the given compound is

Which of the following resonanting structures of 1-methoxy-1,3-butadiene is least stable?