15280 + Interview Questions in Chemistry Page 182 InterviewSolution

9051.	In the presence of an enzyme, the activationenergy of a reaction
Answer» In the presence of an enzyme, the activationenergy of a reaction

Discussion

9052.	10. The number of moles of KMnO4 that will be needed to react completely with one mole of ferrous oxalte in acidic solution is 1)3/5 2)2/5 3)4/5 4)1
Answer» 10. The number of moles of KMnO4 that will be needed to react completely with one mole of ferrous oxalte in acidic solution is 1)3/5 2)2/5 3)4/5 4)1

Discussion

9053.	79.What is reference electrode ?
Answer» 79.What is reference electrode ?

Discussion

9054.	What happens when lemon juice spills on the marble kitchen counter?
Answer» What happens when lemon juice spills on the marble kitchen counter?

Discussion

9055.	Calculate the number of molecules present in 350cmcmcm of NH3 gas at 273K and 2atp
Answer» Calculate the number of molecules present in 350cmcmcm of NH3 gas at 273K and 2atp

Discussion

9056.	Which process is used to purify blister copper during the extraction of pure copper from chalcopyrite?
Answer» Which process is used to purify blister copper during the extraction of pure copper from chalcopyrite?

Discussion

9057.	how many rings are possible in \lbrack Co(en)2ClBr\rbrack what is the formula to calculate number of rings in these compounds?
Answer» how many rings are possible in \lbrack Co(en)2ClBr\rbrack what is the formula to calculate number of rings in these compounds?

Discussion

9058.	What is the meaning of Destabilisation effect of anti Bonding Molecular Orbitals?
Answer» What is the meaning of Destabilisation effect of anti Bonding Molecular Orbitals?

Discussion

9059.	Mg(NO3)2 on thermal decomposition yields:
Answer» Mg(NO₃)₂ on thermal decomposition yields:

Discussion

9060.	Which of the following will be the strongest base?
Answer» Which of the following will be the strongest base?

Discussion

9061.	Which among the following is the weakest acid?
Answer» Which among the following is the weakest acid?

Discussion

9062.	Ethene + ozone + water ->
Answer» Ethene + ozone + water ->

Discussion

9063.	Which of the following is a dibasic acid?
Answer» Which of the following is a dibasic acid?

Discussion

9064.	nt40% PCL5 DISSCOCIATED at 300c.reaction is ccarried out in flask of 1 litre capacity value of Kc?n
Answer» nt40% PCL5 DISSCOCIATED at 300c.reaction is ccarried out in flask of 1 litre capacity value of Kc?n

Discussion

9065.	Why is nitric acid not used in the preparation of hydrogen?
Answer» Why is nitric acid not used in the preparation of hydrogen?

Discussion

9066.	A solution is a mixture of 0.05 M NaCl and 0.05 M NaI. The concentration of iodide ion in the solution when AgCl just starts precipitating is equal to: Ksp(AgCl)=1×10−10 M2; Ksp(AgI)=4×10−16M2
Answer» A solution is a mixture of $0.05 M N a C l$ and $0.05 M N a I$ . The concentration of iodide ion in the solution when $A g C l$ just starts precipitating is equal to: $K_{s p} (A g C l) = 1 \times 10^{- 10} M^{2}; K_{s p} (A g I) = 4 \times 10^{- 16} M^{2}$

Discussion

9067.	The ammonia evolved from 2g of a compound in Kjeldahl's estimation of nitrogen neutralizes 10 mL of 2 M H2SO4 solution. The weight percentage of nitrogen in the compound is
Answer» The ammonia evolved from 2g of a compound in Kjeldahl's estimation of nitrogen neutralizes 10 mL of 2 M $H_{2} S O_{4}$ solution. The weight percentage of nitrogen in the compound is

Discussion

9068.	Oxidation of Ethanol.
Answer» Oxidation of Ethanol.

Discussion

9069.	Why does sky appears to be blue in colour ?
Answer» Why does sky appears to be blue in colour ?

Discussion

9070.	(a) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following sentences:(b) Pure water consists entirely of _________ (ions/molecules).(c) We can expect that pure water _________ (will/will not) normally conduct electricity.
Answer» (a) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following sentences: (b) Pure water consists entirely of _________ (ions/molecules). (c) We can expect that pure water _________ (will/will not) normally conduct electricity.

Discussion

9071.	Question 44 (c) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.
Answer» Question 44 (c) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.

Discussion

9072.	A sample of O2 gas is collected over water at 23∘C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23∘ C is 21 mm Hg). The partial pressure of O2 gas in the sample collected is____.
Answer» A sample of $O_{2}$ gas is collected over water at 23 $^{\circ}$ C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23 $^{\circ}$ C is 21 mm Hg). The partial pressure of $O_{2}$ gas in the sample collected is____.

Discussion

9073.	The radius of first Bohr's orbit in H-atoms is r1. The corresponding wavelength of an electron in 2nd orbit is:
Answer» The radius of first Bohr's orbit in H-atoms is $r_{1}$ . The corresponding wavelength of an electron in 2nd orbit is:

Discussion

9074.	From the list of the substances given, name the substances which you would use to prepare each of the following salts:List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid.Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.
Answer» From the list of the substances given, name the substances which you would use to prepare each of the following salts: List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid. Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.

Discussion

9075.	As a result of sp hybridization, we get:
Answer» As a result of sp hybridization, we get:

9075.

As a result of sp hybridization, we get:

Answer»

As a result of sp hybridization, we get:

Discussion

9076.	A saturated hydrocarbon has fifty hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) twenty five (b) twenty-four (c) twenty-six (d) twenty-seven
Answer» A saturated hydrocarbon has fifty hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) twenty five (b) twenty-four (c) twenty-six (d) twenty-seven

Discussion

9077.	(a) When you have mixed the solutions of lead(II) nitrate and potassium iodide,(i) what was the colour of the precipitate formed and can you name the precipitate?(ii) write the balanced chemical equation for this reaction.(b) What is the difference between displacement and double displacement reactions? Write equations for these reactions.
Answer» (a) When you have mixed the solutions of lead(II) nitrate and potassium iodide, (i) what was the colour of the precipitate formed and can you name the precipitate? (ii) write the balanced chemical equation for this reaction. (b) What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Discussion

9078.	Which physical property was used by Mendeleev for classification?
Answer» Which physical property was used by Mendeleev for classification?

Discussion

9079.	Octet rule states that elements tend to combine by losing, gaining or sharing electrons such that each atom has eight electrons in its valence shell. Why only 8 electrons?
Answer» Octet rule states that elements tend to combine by losing, gaining or sharing electrons such that each atom has eight electrons in its valence shell. Why only 8 electrons?

Discussion

9080.	When ethanol is heated at 443 K with excess concentrated sulphuric acid it gives:
Answer» When ethanol is heated at 443 K with excess concentrated sulphuric acid it gives:

Discussion

9081.	Between ferric and ferrous iron which is more stable?
Answer» Between ferric and ferrous iron which is more stable?

Discussion

9082.	The galvanised article protected against rusting even if the zinc coating is broken. Can you reason this out why?
Answer» The galvanised article protected against rusting even if the zinc coating is broken. Can you reason this out why?

Discussion

9083.	What are the products of thermal decomposition of BaO2?
Answer» What are the products of thermal decomposition of $B a O_{2}$ ?

Discussion

9084.	Which of the following is not an acidic salt?(1) NaH_2PO_2(3) NaH_2PO_4(2) NaH_2PO_3(4) Na_2HPO_{
Answer» Which of the following is not an acidic salt?(1) NaH_2PO_2(3) NaH_2PO_4(2) NaH_2PO_3(4) Na_2HPO_{

Discussion

9085.	The pH of a solution is 5.0. To this solution sufficient acid is added to decrease the pH to 2.0. Then the hydrogen ion concentration increases by:
Answer» The pH of a solution is 5.0. To this solution sufficient acid is added to decrease the pH to 2.0. Then the hydrogen ion concentration increases by:

Discussion

9086.	How Calcium or Magnesium can displace Sodium or Potassium from carboxylic ion in hard water even they are less reactive than sodium and potassium?
Answer» How Calcium or Magnesium can displace Sodium or Potassium from carboxylic ion in hard water even they are less reactive than sodium and potassium?

Discussion

9087.	The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A. What will be the ratio of the pressures acting on B and A ?
Answer» The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A. What will be the ratio of the pressures acting on B and A ?

Discussion

9088.	Choose the nucleophiles from the given ions.
Answer» Choose the nucleophiles from the given ions.

Discussion

9089.	Represent each of the following atoms using Lewis notation: Beryllium Calcium Lithium
Answer» Represent each of the following atoms using Lewis notation: Beryllium Calcium Lithium

Discussion

9090.	What is the role of water of crystallization apart from giving the hydrated salts their colours?
Answer» What is the role of water of crystallization apart from giving the hydrated salts their colours?

Discussion

9091.	The outermost electronic configuration of the most electronegative elements is
Answer» The outermost electronic configuration of the most electronegative elements is

Discussion

9092.	Question 12Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?(i) Au(ii) Cu(iii) Na(iv) K(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (iii) and (iv)
Answer» Question 12 Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining? (i) $A u$ (ii) $C u$ (iii) $N a$ (iv) $K$ (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (iii) and (iv)

9092.

Question 12Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?(i) Au(ii) Cu(iii) Na(iv) K(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (iii) and (iv)

Answer»

Question 12

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$

(ii) $C u$

(iii) $N a$

(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (iii) and (iv)

Discussion

9093.	A bad smelling yellow insoluble resin is obtained by boiling NaOH solution with:(a) HCHO (b) CH3 COCH3 (c) CH3CHO (d) C2H5COCH3
Answer» A bad smelling yellow insoluble resin is obtained by boiling NaOH solution with:(a) HCHO (b) CH3 COCH3 (c) CH3CHO (d) C2H5COCH3

Discussion

9094.	4. The vapour density of two gases are in the ratio of 2:5.Their molecular masses are in the ratio of
Answer» 4. The vapour density of two gases are in the ratio of 2:5.Their molecular masses are in the ratio of

Discussion

9095.	how to find the atomic weight of the substance ?
Answer» how to find the atomic weight of the substance ?

Discussion

9096.	Explain the concept of acid and base?
Answer» Explain the concept of acid and base?

Discussion

9097.	How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?
Answer» How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Discussion

9098.	If copper is exposed to wet air for an extended period, it develops a greenish coating. Why?
Answer» If copper is exposed to wet air for an extended period, it develops a greenish coating. Why?

Discussion

9099.	The % composition of O and H present in monosodium phosphate is respectively:
Answer» The % composition of $O$ and $H$ present in monosodium phosphate is respectively:

Discussion

9100.	Which of the following is true in case of structural isomerism?
Answer» Which of the following is true in case of structural isomerism?

Discussion

Explore topic-wise InterviewSolutions in .

In the presence of an enzyme, the activationenergy of a reaction

10. The number of moles of KMnO4 that will be needed to react completely with one mole of ferrous oxalte in acidic solution is 1)3/5 2)2/5 3)4/5 4)1

79.What is reference electrode ?

What happens when lemon juice spills on the marble kitchen counter?

Calculate the number of molecules present in 350cmcmcm of NH3 gas at 273K and 2atp

Which process is used to purify blister copper during the extraction of pure copper from chalcopyrite?

how many rings are possible in \lbrack Co(en)2ClBr\rbrack what is the formula to calculate number of rings in these compounds?

What is the meaning of Destabilisation effect of anti Bonding Molecular Orbitals?

Mg(NO3)2 on thermal decomposition yields:

Which of the following will be the strongest base?

Which among the following is the weakest acid?

Ethene + ozone + water ->

Which of the following is a dibasic acid?

nt40% PCL5 DISSCOCIATED at 300c.reaction is ccarried out in flask of 1 litre capacity value of Kc?n

Why is nitric acid not used in the preparation of hydrogen?

A solution is a mixture of 0.05 M NaCl and 0.05 M NaI. The concentration of iodide ion in the solution when AgCl just starts precipitating is equal to: Ksp(AgCl)=1×10−10 M2; Ksp(AgI)=4×10−16M2

The ammonia evolved from 2g of a compound in Kjeldahl's estimation of nitrogen neutralizes 10 mL of 2 M H2SO4 solution. The weight percentage of nitrogen in the compound is

Oxidation of Ethanol.

Why does sky appears to be blue in colour ?

(a) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following sentences:(b) Pure water consists entirely of _________ (ions/molecules).(c) We can expect that pure water _________ (will/will not) normally conduct electricity.

Question 44 (c) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.

A sample of O2 gas is collected over water at 23∘C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23∘ C is 21 mm Hg). The partial pressure of O2 gas in the sample collected is____.

The radius of first Bohr's orbit in H-atoms is r1. The corresponding wavelength of an electron in 2nd orbit is:

As a result of sp hybridization, we get:

A saturated hydrocarbon has fifty hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) twenty five (b) twenty-four (c) twenty-six (d) twenty-seven

Which physical property was used by Mendeleev for classification?

Octet rule states that elements tend to combine by losing, gaining or sharing electrons such that each atom has eight electrons in its valence shell. Why only 8 electrons?

When ethanol is heated at 443 K with excess concentrated sulphuric acid it gives:

Between ferric and ferrous iron which is more stable?

The galvanised article protected against rusting even if the zinc coating is broken. Can you reason this out why?

What are the products of thermal decomposition of BaO2?

Which of the following is not an acidic salt?(1) NaH_2PO_2(3) NaH_2PO_4(2) NaH_2PO_3(4) Na_2HPO_{

The pH of a solution is 5.0. To this solution sufficient acid is added to decrease the pH to 2.0. Then the hydrogen ion concentration increases by:

How Calcium or Magnesium can displace Sodium or Potassium from carboxylic ion in hard water even they are less reactive than sodium and potassium?

The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A. What will be the ratio of the pressures acting on B and A ?

Choose the nucleophiles from the given ions.

Represent each of the following atoms using Lewis notation: Beryllium Calcium Lithium

What is the role of water of crystallization apart from giving the hydrated salts their colours?

The outermost electronic configuration of the most electronegative elements is

Question 12Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?(i) Au(ii) Cu(iii) Na(iv) K(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (iii) and (iv)

A bad smelling yellow insoluble resin is obtained by boiling NaOH solution with:(a) HCHO (b) CH3 COCH3 (c) CH3CHO (d) C2H5COCH3

4. The vapour density of two gases are in the ratio of 2:5.Their molecular masses are in the ratio of

how to find the atomic weight of the substance ?

Explain the concept of acid and base?

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

If copper is exposed to wet air for an extended period, it develops a greenish coating. Why?

The % composition of O and H present in monosodium phosphate is respectively:

Which of the following is true in case of structural isomerism?

(a) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following sentences:(b) Pure water consists entirely of _ (ions/molecules).(c) We can expect that pure water _ (will/will not) normally conduct electricity.