15280 + Interview Questions in Chemistry Page 119 InterviewSolution

5901.	Copper reacts with dilute nitric acid and forms copper nitrate, nitric oxide gas and water
Answer» Copper reacts with dilute nitric acid and forms copper nitrate, nitric oxide gas and water

Discussion

5902.	10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4. What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]
Answer» 10g of Fe powder was mixed with a $C u S O_{4}$ solution which contained 70g of $C u S O_{4}$ . What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

5902.

10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4. What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

Answer»

10g of Fe powder was mixed with a $C u S O_{4}$ solution which contained 70g of $C u S O_{4}$ . What is the weight of the copper obtained?

[Fe = 55.85g Cu = 63.6g]

Discussion

5903.	Why do alkali metal and alkali earth metal show high degree of reactivity?
Answer» Why do alkali metal and alkali earth metal show high degree of reactivity?

Discussion

5904.	Which one of the following procedures is correct to detect the acidic nature of SO2 gas?(1) Insert wet blue litmus paper in a gas jar filled with SO2 gas(2) Insert wet red litmus paper in a gas jar filled with SO2 gas(3) Insert dry blue litmus paper in a gas jar filled with SO2 gas(4) Insert dry red litmus paper in the gas jar filled with SO2 gas
Answer» Which one of the following procedures is correct to detect the acidic nature of SO₂ gas? (1) Insert wet blue litmus paper in a gas jar filled with SO₂gas (2) Insert wet red litmus paper in a gas jar filled with SO₂ gas (3) Insert dry blue litmus paper in a gas jar filled with SO₂gas (4) Insert dry red litmus paper in the gas jar filled with SO₂ gas

Discussion

5905.	In the following reaction, identify the salt formed. NH4OH (aq) + H2SO4 (aq) → _________ +H2O(l)
Answer» In the following reaction, identify the salt formed. NH₄OH (aq) + H₂SO₄ (aq) → _________ +H₂O(l)

Discussion

5906.	Write the balanced equation for the reaction between Barium cholride and Sulphuric acid.
Answer» Write the balanced equation for the reaction between Barium cholride and Sulphuric acid.

Discussion

5907.	explain hybridisation of diborane
Answer» explain hybridisation of diborane

Discussion

5908.	The inversion of cane sugar proceeds with half life of 50 min at pH = 5 at any concentration of sugar. However , if the pH=6 , the half life changes to 500 min at any concentration of sugar. the rate law expression for the inversion of sugar can be written as
Answer» The inversion of cane sugar proceeds with half life of 50 min at pH = 5 at any concentration of sugar. However , if the pH=6 , the half life changes to 500 min at any concentration of sugar. the rate law expression for the inversion of sugar can be written as

Discussion

5909.	F − (Fluorine) ion is having 10 electrons (9 + 1 = 10). Hence, the species which is isoelectronic with F^{-}F − must also have 10 electrons.It’s some isoelectronic species arei)Na^{+}Na + ion it is also having 10 electrons ( 11 – 1 = 10).ii)Ne ion it is also having 10 electrons.iii)Al^{3+}Al 3+ ion it is also having 10 electrons ( 13 – 3 = 10).
Answer» F − (Fluorine) ion is having 10 electrons (9 + 1 = 10). Hence, the species which is isoelectronic with F^{-}F − must also have 10 electrons. It’s some isoelectronic species are i)Na^{+}Na + ion it is also having 10 electrons ( 11 – 1 = 10). ii)Ne ion it is also having 10 electrons. iii)Al^{3+}Al 3+ ion it is also having 10 electrons ( 13 – 3 = 10).

Discussion

5910.	Question 44(b)The following reaction takes place when aluminium powder is heated with MnO2:3MnO2(s)+4Al (s)→3Mn (l)+2Al2O3(l)+HeatIs 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

5911.	is the chemical formula of bleaching powder.
Answer» is the chemical formula of bleaching powder.

Discussion

5912.	How does bubbles.keep on coming indefinitly on the surface when is heated regularly as.we know the dissolved water is limited
Answer» How does bubbles.keep on coming indefinitly on the surface when is heated regularly as.we know the dissolved water is limited

Discussion

5913.	Given the standard electrode potentials,K+/K=−2.93 VAg+/Ag=0.80 VHg2+/Hg=0.79 VMg2+/Mg=−2.73 VCr3+/Cr=−0.74 VThe increasing order of reducing power is:
Answer» Given the standard electrode potentials, $K^{+} / K = - 2.93 V A g^{+} / A g = 0.80 V H g^{2 +} / H g = 0.79 V M g^{2 +} / M g = - 2.73 V C r^{3 +} / C r = - 0.74 V$ The increasing order of reducing power is:

Discussion

5914.	Elements X and Y have the following configurations:X (2, 8, 7), Y (2, 8, 8, 2)Answer the following questions:(a) What will be the nature of the bond between X and Y?(b) Draw the diagram to show the bond formation between X and Y.(c) State three main properties of this compound.
Answer» Elements X and Y have the following configurations: X (2, 8, 7), Y (2, 8, 8, 2) Answer the following questions: (a) What will be the nature of the bond between X and Y? (b) Draw the diagram to show the bond formation between X and Y. (c) State three main properties of this compound.

Discussion

5915.	For cyclohexene, if total no. of vinylic H-atom is P and no. of allylic H-atoms is Q, then give the value of (P+Q):
Answer» For cyclohexene, if total no. of vinylic $H$ -atom is P and no. of allylic $H$ -atoms is Q, then give the value of (P+Q):

Discussion

5916.	30. Ca(OH)_2 + CO_2 \xrightarrow{} CaCO_3 + H_2O Why calcium hydroxide + Carbon dioxide form Calcium carbonate + Water
Answer» 30. Ca(OH)_2 + CO_2 \xrightarrow{} CaCO_3 + H_2O Why calcium hydroxide + Carbon dioxide form Calcium carbonate + Water

Discussion

5917.	Which of the following compounds is covalent?
Answer» Which of the following compounds is covalent?

Discussion

5918.	27.which has more stronger conjugate base H2S OR H2O and why?
Answer» 27.which has more stronger conjugate base H2S OR H2O and why?

Discussion

5919.	{ 44. In which of the following reactions, }H_2O_2 acts }} as oxidising agent? }{ 1) }Cl_2+H_2O_2→2HCl+O_2}{ 2) }Ag_2O+H_2O_2→2Ag+H_2O+O_2}{ 3) }2NaOH+H_2O_2→ Na_2O_2+2H_2O}{ 4) }KNO_2+H_2O_2→ KNO_3+H_2O
Answer» { 44. In which of the following reactions, }H_2O_2 acts }} as oxidising agent? }{ 1) }Cl_2+H_2O_2→2HCl+O_2}{ 2) }Ag_2O+H_2O_2→2Ag+H_2O+O_2}{ 3) }2NaOH+H_2O_2→ Na_2O_2+2H_2O}{ 4) }KNO_2+H_2O_2→ KNO_3+H_2O

Discussion

5920.	Alkynes have a general formula:
Answer» Alkynes have a general formula:

Discussion

5921.	which of the following species octet is not satisfied by atleast one atom 1)so2;2)co3^{-2} 3)H3O^+ 4) CO2
Answer» which of the following species octet is not satisfied by atleast one atom 1)so2;2)co3^{-2} 3)H3O^+ 4) CO2

Discussion

5922.	6 mol of a mixture containing same number of moles of NaNO3, NH4NO3, LiNO3, Ca(NO3)2,Pb(NO3)2 and AgNO3, was heated strongly. Total number of moles of O2(g) evolved is :
Answer» $6$ mol of a mixture containing same number of moles of $N a N O_{3}, N H_{4} N O_{3}, L i N O_{3}, C a (N O_{3})_{2}, P b (N O_{3})_{2}$ and $A g N O_{3}$ , was heated strongly. Total number of moles of $O_{2} (g)$ evolved is :

Discussion

5923.	A sub-shell of l has _____ angular nodes.
Answer» A sub-shell of l has _____ angular nodes.

Discussion

5924.	While burning paper a reduction in mass is observed. Is it an exception to the law of conservation of mass?
Answer» While burning paper a reduction in mass is observed. Is it an exception to the law of conservation of mass?

Discussion

5925.	resonance in turning fork
Answer» resonance in turning fork

Discussion

5926.	What is allotrophy and what are saturated and unsaturated hycarbons? Briefly
Answer» What is allotrophy and what are saturated and unsaturated hycarbons? Briefly

Discussion

5927.	A student takes Cu, Al, Fe and Zn pieces separately in four test tubes labelled as I, II, III, and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.He would observe a black residue in the test tubes :(1) (I) and (II)(2) (I) and (III) (3) (II) and (III)(4) (II) and (IV)
Answer» A student takes Cu, Al, Fe and Zn pieces separately in four test tubes labelled as I, II, III, and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case. He would observe a black residue in the test tubes : (1) (I) and (II) (2) (I) and (III) (3) (II) and (III) (4) (II) and (IV)

Discussion

5928.	Select the correct answer from the choices a, b, c and d which are given.Write only the letter corresponding to the correct answer.(i) A compound which liberates reddish brown gas around the anode during the electrolysis in its molten state is:(a) Sodium chloride(b) Copper (II) oxide(c) Copper (II) sulphate(d) Lead (II) bromide(ii) During ionization metals lose electrons, this change can be called:(a) Oxidation(b) Reduction(c) Redox(d) Displacement
Answer» Select the correct answer from the choices a, b, c and d which are given. Write only the letter corresponding to the correct answer. (i) A compound which liberates reddish brown gas around the anode during the electrolysis in its molten state is: (a) Sodium chloride (b) Copper (II) oxide (c) Copper (II) sulphate (d) Lead (II) bromide (ii) During ionization metals lose electrons, this change can be called: (a) Oxidation (b) Reduction (c) Redox (d) Displacement

Discussion

5929.	Equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules, is
Answer» Equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules, is

Discussion

5930.	(a) Explain why ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity. (b) Which of the following will conduct electricity and which not? MgCl2,CCl4,NaCl,CS2,Na2S Give reasons for your choice.
Answer» (a) Explain why ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity. (b) Which of the following will conduct electricity and which not? $M g C l_{2}, C C l_{4}, N a C l, C S_{2}, N a_{2} S$ Give reasons for your choice.

Discussion

5931.	For which of the following ores, the process of self reduction can be used?
Answer» For which of the following ores, the process of self reduction can be used?

Discussion

5932.	What will be the toal no of ions and charge in A2B3 ? Solution needed.
Answer» What will be the toal no of ions and charge in A2B3 ? Solution needed.

Discussion

5933.	What is the chemical name of the following compound?
Answer» What is the chemical name of the following compound?

5933.

What is the chemical name of the following compound?

Answer»

What is the chemical name of the following compound?

Discussion

5934.	Give balanced reactions for the following: [4 MARKS] (a) Sodium is dropped in water. (b) Magnesium reacts with boiling water. (c) Red hot iron reacts with steam. (d) Iron reacts with dilute HCI.
Answer» Give balanced reactions for the following: [4 MARKS] (a) Sodium is dropped in water. (b) Magnesium reacts with boiling water. (c) Red hot iron reacts with steam. (d) Iron reacts with dilute HCI.

Discussion

5935.	Complete the trophic levels in the following food chain: Producers → ? → Secondary consumers → ? → Decomposers
Answer» Complete the trophic levels in the following food chain: Producers → ? → Secondary consumers → ? → Decomposers

5935.

Complete the trophic levels in the following food chain: Producers → ? → Secondary consumers → ? → Decomposers

Answer»

Complete the trophic levels in the following food chain:

Producers → ? → Secondary consumers → ? → Decomposers

Discussion

5936.	7. Which of the following is amphoteric A) crO2 B) cr2O3 C)CrO5 D)crO
Answer» 7. Which of the following is amphoteric A) crO2 B) cr2O3 C)CrO5 D)crO

Discussion

5937.	Carbonic acid gives an acid salt but hydrochloric does not. Explain.
Answer» Carbonic acid gives an acid salt but hydrochloric does not. Explain.

Discussion

5938.	Question 7 The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group? (a) A and B (b) B and D (c) A and C (d) D and E
Answer» Question 7 The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group? (a) A and B (b) B and D (c) A and C (d) D and E

Discussion

5939.	What is an alloy? Give three reasons why alloys are made.
Answer» What is an alloy? Give three reasons why alloys are made.

Discussion

5940.	Which of the following hydrocarbon does not undergo addition reaction?
Answer» Which of the following hydrocarbon does not undergo addition reaction?

Discussion

5941.	What is the meaning of positron and thrust
Answer» What is the meaning of positron and thrust

Discussion

5942.	2HX(g)⇋H2(g)+X2(g); KC=1.0×10−5What is the concentration of HX if the equilibrium concentration of H2 and X2 is 1.2×10−3 M and 1.2×10−4 M respectively?
Answer» $2 H X (g) ⇋ H_{2} (g) + X_{2} (g); K_{C} = 1.0 \times 10^{- 5}$ What is the concentration of $H X$ if the equilibrium concentration of $H_{2}$ and $X_{2}$ is $1.2 \times 10^{- 3} M$ and $1.2 \times 10^{- 4} M$ respectively?

Discussion

5943.	The number of molecules of water of crystallisation present in washing soda crystals is : (a) five (b) two (c) ten (d) seven
Answer» The number of molecules of water of crystallisation present in washing soda crystals is : (a) five (b) two (c) ten (d) seven

5943.

The number of molecules of water of crystallisation present in washing soda crystals is : (a) five (b) two (c) ten (d) seven

Answer»

The number of molecules of water of crystallisation present in washing soda crystals is :

(a) five

(b) two

(c) ten

(d) seven

Discussion

5944.	What is a lone pair of electrons?
Answer» What is a lone pair of electrons?

Discussion

5945.	What happens when some zinc pieces are added into blue copper sulphate solution? [1 MARK]
Answer» What happens when some zinc pieces are added into blue copper sulphate solution? [1 MARK]

Discussion

5946.	Write the general formulas of alkane, alkene and alkyne.
Answer» Write the general formulas of alkane, alkene and alkyne.

Discussion

5947.	Which of ollowing cannot act both as acid and base (Bronsted) ? (a) HCO_3^{- }(b) HCrO_4^{- } (c) H_2O (d) F^-
Answer» Which of ollowing cannot act both as acid and base (Bronsted) ? (a) HCO_3^{- }(b) HCrO_4^{- } (c) H_2O (d) F^-

Discussion

5948.	(a) Name the metal which is extracted from haematite ore?(b) Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.(c) How is aluminium metal extracted? Explain with the help of an equation.(d) Name the electrode at which aluminium metal is produced.(e) Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?(f) What is an alloy? Name two alloys of aluminium.
Answer» (a) Name the metal which is extracted from haematite ore? (b) Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula. (c) How is aluminium metal extracted? Explain with the help of an equation. (d) Name the electrode at which aluminium metal is produced. (e) Which gas is produced during the extraction of aluminium? At which electrode is this gas produced? (f) What is an alloy? Name two alloys of aluminium.

Discussion

5949.	(a) An organic compound X of molecular formula C2H4O2 gives brisk effervescence with sodium hydrogen carbonate. give the name and formula of X. (b) A mixture of ethyne (acetylene) and oxygen is burnt for welding. Can you tell why a mixture of ethyne and air is not used? (c) Name a chemical reaction which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes).
Answer» (a) An organic compound X of molecular formula $C_{2} H_{4} O_{2}$ gives brisk effervescence with sodium hydrogen carbonate. give the name and formula of X. (b) A mixture of ethyne (acetylene) and oxygen is burnt for welding. Can you tell why a mixture of ethyne and air is not used? (c) Name a chemical reaction which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes).

Discussion

5950.	Which of the following hydrides cannot be obtained by direct reaction between the elements?
Answer» Which of the following hydrides cannot be obtained by direct reaction between the elements?

Discussion

Explore topic-wise InterviewSolutions in .

Copper reacts with dilute nitric acid and forms copper nitrate, nitric oxide gas and water

10g of Fe powder was mixed with a CuSO4 solution which contained 70g of CuSO4. What is the weight of the copper obtained? [Fe = 55.85g Cu = 63.6g]

Why do alkali metal and alkali earth metal show high degree of reactivity?

In the following reaction, identify the salt formed. NH4OH (aq) + H2SO4 (aq) → _________ +H2O(l)

Write the balanced equation for the reaction between Barium cholride and Sulphuric acid.

explain hybridisation of diborane

The inversion of cane sugar proceeds with half life of 50 min at pH = 5 at any concentration of sugar. However , if the pH=6 , the half life changes to 500 min at any concentration of sugar. the rate law expression for the inversion of sugar can be written as

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

is the chemical formula of bleaching powder.

How does bubbles.keep on coming indefinitly on the surface when is heated regularly as.we know the dissolved water is limited

Given the standard electrode potentials,K+/K=−2.93 VAg+/Ag=0.80 VHg2+/Hg=0.79 VMg2+/Mg=−2.73 VCr3+/Cr=−0.74 VThe increasing order of reducing power is:

Elements X and Y have the following configurations:X (2, 8, 7), Y (2, 8, 8, 2)Answer the following questions:(a) What will be the nature of the bond between X and Y?(b) Draw the diagram to show the bond formation between X and Y.(c) State three main properties of this compound.

For cyclohexene, if total no. of vinylic H-atom is P and no. of allylic H-atoms is Q, then give the value of (P+Q):

30. Ca(OH)_2 + CO_2 \xrightarrow{} CaCO_3 + H_2O Why calcium hydroxide + Carbon dioxide form Calcium carbonate + Water

Which of the following compounds is covalent?

27.which has more stronger conjugate base H2S OR H2O and why?

{ 44. In which of the following reactions, }H_2O_2 acts }} as oxidising agent? }{ 1) }Cl_2+H_2O_2→2HCl+O_2}{ 2) }Ag_2O+H_2O_2→2Ag+H_2O+O_2}{ 3) }2NaOH+H_2O_2→ Na_2O_2+2H_2O}{ 4) }KNO_2+H_2O_2→ KNO_3+H_2O

Alkynes have a general formula:

which of the following species octet is not satisfied by atleast one atom 1)so2;2)co3^{-2} 3)H3O^+ 4) CO2

6 mol of a mixture containing same number of moles of NaNO3, NH4NO3, LiNO3, Ca(NO3)2,Pb(NO3)2 and AgNO3, was heated strongly. Total number of moles of O2(g) evolved is :

A sub-shell of l has _____ angular nodes.

While burning paper a reduction in mass is observed. Is it an exception to the law of conservation of mass?

resonance in turning fork

What is allotrophy and what are saturated and unsaturated hycarbons? Briefly

Equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules, is

(a) Explain why ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity. (b) Which of the following will conduct electricity and which not? MgCl2,CCl4,NaCl,CS2,Na2S Give reasons for your choice.

For which of the following ores, the process of self reduction can be used?

What will be the toal no of ions and charge in A2B3 ? Solution needed.

What is the chemical name of the following compound?

Give balanced reactions for the following: [4 MARKS] (a) Sodium is dropped in water. (b) Magnesium reacts with boiling water. (c) Red hot iron reacts with steam. (d) Iron reacts with dilute HCI.

Complete the trophic levels in the following food chain: Producers → ? → Secondary consumers → ? → Decomposers

7. Which of the following is amphoteric A) crO2 B) cr2O3 C)CrO5 D)crO

Carbonic acid gives an acid salt but hydrochloric does not. Explain.

Question 7 The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group? (a) A and B (b) B and D (c) A and C (d) D and E

What is an alloy? Give three reasons why alloys are made.

Which of the following hydrocarbon does not undergo addition reaction?

What is the meaning of positron and thrust

2HX(g)⇋H2(g)+X2(g); KC=1.0×10−5What is the concentration of HX if the equilibrium concentration of H2 and X2 is 1.2×10−3 M and 1.2×10−4 M respectively?

The number of molecules of water of crystallisation present in washing soda crystals is : (a) five (b) two (c) ten (d) seven

What is a lone pair of electrons?

What happens when some zinc pieces are added into blue copper sulphate solution? [1 MARK]

Write the general formulas of alkane, alkene and alkyne.

Which of ollowing cannot act both as acid and base (Bronsted) ? (a) HCO_3^{- }(b) HCrO_4^{- } (c) H_2O (d) F^-

Which of the following hydrides cannot be obtained by direct reaction between the elements?