15280 + Interview Questions in Chemistry Page 194 InterviewSolution

9651.	Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium. Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and hence, less attraction from the nucleus.
Answer» Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium. Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and hence, less attraction from the nucleus.

Discussion

9652.	When the stopper of a bottle full of hydrogen chloride liquid is opened, fumes can be seen coming out. Why does this happen?
Answer» When the stopper of a bottle full of hydrogen chloride liquid is opened, fumes can be seen coming out. Why does this happen?

Discussion

9653.	Give an example of aquatic ecosystem.
Answer» Give an example of aquatic ecosystem.

Discussion

9654.	Q: Equation of rusting of iron.
Answer» Q: Equation of rusting of iron.

Discussion

9655.	What are the functional groups present in following compound?
Answer» What are the functional groups present in following compound?

Discussion

9656.	Which of the following elements can form alloys?
Answer» Which of the following elements can form alloys?

Discussion

9657.	State whether the following statement is true or false : On going down in a group of the periodic table, the number of valence electrons increases.
Answer» State whether the following statement is true or false : On going down in a group of the periodic table, the number of valence electrons increases.

9657.

State whether the following statement is true or false : On going down in a group of the periodic table, the number of valence electrons increases.

Answer»

State whether the following statement is true or false :

On going down in a group of the periodic table, the number of valence electrons increases.

Discussion

9658.	Explain the shortcut technique of balancing the equation.
Answer» Explain the shortcut technique of balancing the equation.

Discussion

9659.	Which among the following acids can be used in the making of fertilizers?
Answer» Which among the following acids can be used in the making of fertilizers?

Discussion

9660.	Why shouldn't food items with acidic components be stored in metallic containers?
Answer» Why shouldn't food items with acidic components be stored in metallic containers?

Discussion

9661.	1200 c of oxygen was burnt with 400 cc of Methane (CH4). Calculate the volume of unused oxygen left, after writing the balanced equation. Methane + Oxygen → Carbon dioxide + Water vapour
Answer» 1200 c of oxygen was burnt with 400 cc of Methane $(C H_{4})$ . Calculate the volume of unused oxygen left, after writing the balanced equation. Methane + Oxygen $\to$ Carbon dioxide + Water vapour

9661.

1200 c of oxygen was burnt with 400 cc of Methane (CH4). Calculate the volume of unused oxygen left, after writing the balanced equation. Methane + Oxygen → Carbon dioxide + Water vapour

Answer»

1200 c of oxygen was burnt with 400 cc of Methane $(C H_{4})$ . Calculate the volume of unused oxygen left, after writing the balanced equation.

Methane + Oxygen $\to$ Carbon dioxide + Water vapour

Discussion

9662.	Which of the following is not a condensation polymer?
Answer» Which of the following is not a condensation polymer?

Discussion

9663.	pH of 1M HCl is ___
Answer» pH of 1M HCl is ___

Discussion

9664.	Which kind of molecules is made up of atoms of the same element?
Answer» Which kind of molecules is made up of atoms of the same element?

Discussion

9665.	Find the mass of KNO3 required to produce 126 kg of nitric acid. Find whether a larger or smaller mass of NaNO3 is required for the same purpose. KNO3+H2SO4→KHSO4+HNO3NaNO3+H2SO4⇒NaHSO4+HNO3
Answer» Find the mass of $K N O_{3}$ required to produce 126 kg of nitric acid. Find whether a larger or smaller mass of $N a N O_{3}$ is required for the same purpose. $K N O_{3} + H_{2} S O_{4} \to K H S O_{4} + H N O_{3} N a N O_{3} + H_{2} S O_{4} \Rightarrow N a H S O_{4} + H N O_{3}$

Discussion

9666.	The Van der Waals radii of O,N,Cl,F and Ne increases in the order?
Answer» The Van der Waals radii of $O, N, C l, F$ and $N e$ increases in the order?

Discussion

9667.	Identify 'X' in the reaction: 2HCl + CuO → X + H2O
Answer» Identify 'X' in the reaction: 2HCl + CuO → X + H₂O

Discussion

9668.	Choose the option representing the correct percentage content of ethanol in its different types.
Answer» Choose the option representing the correct percentage content of ethanol in its different types.

Discussion

9669.	The products formed in the direct substitution of alkanes with halogens can be seperated by
Answer» The products formed in the direct substitution of alkanes with halogens can be seperated by

Discussion

9670.	If carbon does not conduct electricity then why does graphite?
Answer» If carbon does not conduct electricity then why does graphite?

Discussion

9671.	The volume of 1 mole of an ideal gas at 25∘C temperature and 1 bar pressure is:
Answer» The volume of 1 mole of an ideal gas at $25^{\circ} C$ temperature and 1 bar pressure is:

Discussion

9672.	why are metals like sodium potassium and lithium soft in nature unlike other metals?
Answer» why are metals like sodium potassium and lithium soft in nature unlike other metals?

Discussion

9673.	Choose the correct sequence for extraction of metal from its ore. i) Concentration of ore ii) Reduction of metallic oxides iii) Conversion of the ore into its oxide iv) Refining of impure metal
Answer» Choose the correct sequence for extraction of metal from its ore. i) Concentration of ore ii) Reduction of metallic oxides iii) Conversion of the ore into its oxide iv) Refining of impure metal

9673.

Choose the correct sequence for extraction of metal from its ore. i) Concentration of ore ii) Reduction of metallic oxides iii) Conversion of the ore into its oxide iv) Refining of impure metal

Answer»

Choose the correct sequence for extraction of metal from its ore.

i) Concentration of ore
ii) Reduction of metallic oxides
iii) Conversion of the ore into its oxide
iv) Refining of impure metal

Discussion

9674.	IUPAC name for: [2 MARKS] 1. CH3CH2Br 2. HCHO
Answer» IUPAC name for: [2 MARKS] 1. ${CH}_{3} {CH}_{2} Br$ 2. $HCHO$

Discussion

9675.	Covalent bond is formed between:
Answer» Covalent bond is formed between:

Discussion

9676.	Which of the following statements is correct?
Answer» Which of the following statements is correct?

Discussion

9677.	The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period
Answer» The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period

9677.

The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period

Answer»

The atomic number of an element is 20. In the modern periodic table, this element is placed in :

(a) 2nd period (b) 4th period (c) 3rd period (d) 1st period

Discussion

9678.	Analyse the elements given below and identify ‘X’ if the given elements are forming Dobereiner's triad. Li (6.9), Na (X), K (39.0)
Answer» Analyse the elements given below and identify ‘X’ if the given elements are forming Dobereiner's triad. Li (6.9), Na (X), K (39.0)

Discussion

9679.	Ethanol can be converted into ethene which can be changed into ethane. Choose the correct word or phrase from the brackets to complete the following sentences. (a) The conversion of ethanol into ethene is an example of (dehydration, dehydrogenation). (b) Converting ethanol into ethene requires the use of (conc. HCl, conc. HNO3,conc.H2SO4). (c) The conversion of ethene into ethane is an example of (hydration, hydrogenation). (d) The catalyst used in the conversion of ethene into ethane is commonly (iron, nickel, cobalt).
Answer» Ethanol can be converted into ethene which can be changed into ethane. Choose the correct word or phrase from the brackets to complete the following sentences. (a) The conversion of ethanol into ethene is an example of (dehydration, dehydrogenation). (b) Converting ethanol into ethene requires the use of (conc. HCl, conc. $H N O_{3}, c o n c . H_{2} S O_{4})$ . (c) The conversion of ethene into ethane is an example of (hydration, hydrogenation). (d) The catalyst used in the conversion of ethene into ethane is commonly (iron, nickel, cobalt).

9679.

Ethanol can be converted into ethene which can be changed into ethane. Choose the correct word or phrase from the brackets to complete the following sentences. (a) The conversion of ethanol into ethene is an example of (dehydration, dehydrogenation). (b) Converting ethanol into ethene requires the use of (conc. HCl, conc. HNO3,conc.H2SO4). (c) The conversion of ethene into ethane is an example of (hydration, hydrogenation). (d) The catalyst used in the conversion of ethene into ethane is commonly (iron, nickel, cobalt).

Answer»

Ethanol can be converted into ethene which can be changed into ethane. Choose the correct word or phrase from the brackets to complete the following sentences.

(a) The conversion of ethanol into ethene is an example of (dehydration, dehydrogenation).
(b) Converting ethanol into ethene requires the use of (conc. HCl, conc. $H N O_{3}, c o n c . H_{2} S O_{4})$ .
(c) The conversion of ethene into ethane is an example of (hydration, hydrogenation).
(d) The catalyst used in the conversion of ethene into ethane is commonly (iron, nickel, cobalt).

Discussion

9680.	Hydrogen can be placed in group 1 and group 17 of periodic table. Why?
Answer» Hydrogen can be placed in group 1 and group 17 of periodic table. Why?

Discussion

9681.	Which of the following carbon compound is used as a solvent?
Answer» Which of the following carbon compound is used as a solvent?

Discussion

9682.	The atomic number of an element is more important to the chemist than its relative atomic mass. Why?
Answer» The atomic number of an element is more important to the chemist than its relative atomic mass. Why?

Discussion

9683.	The atomic number of an element 'X' is 15 . Identify its position in the modern periodic table
Answer» The atomic number of an element 'X' is 15 . Identify its position in the modern periodic table

Discussion

9684.	Wires that carry current in our home have a coating of polyvinylchloride or a rubber like material why are electrical wires coated with such substsnces
Answer» Wires that carry current in our home have a coating of polyvinylchloride or a rubber like material why are electrical wires coated with such substsnces

Discussion

9685.	The chlorination of alkanes is initiated by homolysis of chlorine molecule because:
Answer» The chlorination of alkanes is initiated by homolysis of chlorine molecule because:

Discussion

9686.	Balance the following equation by short-cut method, and write the coefficient for O2 C5H11NH2+O2→CO2+H2O+NO2 ___.
Answer» Balance the following equation by short-cut method, and write the coefficient for $O_{2}$ $C_{5} H_{11} N H_{2} + O_{2} \to C O_{2} + H_{2} O + N O_{2}$ ___.

Discussion

9687.	Maximum number of electrons is present in O2
Answer» Maximum number of electrons is present in $O_{2}$

Discussion

9688.	A student puts down his signature in graphite pencil. If the mass of carbon in the signature is 10−12 g. Calculate the number of atoms in the signature.
Answer» A student puts down his signature in graphite pencil. If the mass of carbon in the signature is $10^{- 12} g$ . Calculate the number of atoms in the signature.

Discussion

9689.	When barium chloride is added to soluble magnesium sulphate, a white precipitate X is formed. What is X?
Answer» When barium chloride is added to soluble magnesium sulphate, a white precipitate X is formed. What is X?

Discussion

9690.	Hydrogen sulphide gets oxidised to ___by conc. sulphuric acid.
Answer» Hydrogen sulphide gets oxidised to ___by conc. sulphuric acid.

Discussion

9691.	What is meant by skeltal type chemical equation? What does it represent ? Using thee equation for elecrolytic decompostion of water and also differentiate between skeltal chemical eqaution and a balanced chemical equation?
Answer» What is meant by skeltal type chemical equation? What does it represent ? Using thee equation for elecrolytic decompostion of water and also differentiate between skeltal chemical eqaution and a balanced chemical equation?

Discussion

9692.	Explain the process of EMULSIFICATION
Answer» Explain the process of EMULSIFICATION

Discussion

9693.	Explain the physical nature of carbon and its compounds.
Answer» Explain the physical nature of carbon and its compounds.

Discussion

9694.	List some uses of iron in our everyday life.
Answer» List some uses of iron in our everyday life.

Discussion

9695.	One roentgen is defined as the quantity of radiation which produces ‘x’ pairs of ion in 1 gram of air. The value of ‘x’ is:
Answer» One roentgen is defined as the quantity of radiation which produces ‘x’ pairs of ion in 1 gram of air. The value of ‘x’ is:

Discussion

9696.	The black coating on silver is due to:
Answer» The black coating on silver is due to:

Discussion

9697.	Which of the following contains both polar and non-polar bonds –
Answer» Which of the following contains both polar and non-polar bonds –

Discussion

9698.	What is the difference between alkali and alkaline??
Answer» What is the difference between alkali and alkaline??

Discussion

9699.	Charged comb attract pieces of paper, but a charged battery doesn't, why?
Answer» Charged comb attract pieces of paper, but a charged battery doesn't, why?

Discussion

9700.	On comparison with water, which of these is true about sulphuric acid?
Answer» On comparison with water, which of these is true about sulphuric acid?

Discussion

Explore topic-wise InterviewSolutions in .

Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium. Statement II: Lithium has 1 electron in its outermost orbit which is loosely bound due to the repulsion of the inner orbit electrons and hence, less attraction from the nucleus.

When the stopper of a bottle full of hydrogen chloride liquid is opened, fumes can be seen coming out. Why does this happen?

Give an example of aquatic ecosystem.

Q: Equation of rusting of iron.

What are the functional groups present in following compound?

Which of the following elements can form alloys?

State whether the following statement is true or false : On going down in a group of the periodic table, the number of valence electrons increases.

Explain the shortcut technique of balancing the equation.

Which among the following acids can be used in the making of fertilizers?

Why shouldn't food items with acidic components be stored in metallic containers?

1200 c of oxygen was burnt with 400 cc of Methane (CH4). Calculate the volume of unused oxygen left, after writing the balanced equation. Methane + Oxygen → Carbon dioxide + Water vapour

Which of the following is not a condensation polymer?

pH of 1M HCl is ___

Which kind of molecules is made up of atoms of the same element?

Find the mass of KNO3 required to produce 126 kg of nitric acid. Find whether a larger or smaller mass of NaNO3 is required for the same purpose. KNO3+H2SO4→KHSO4+HNO3NaNO3+H2SO4⇒NaHSO4+HNO3

The Van der Waals radii of O,N,Cl,F and Ne increases in the order?

Identify 'X' in the reaction: 2HCl + CuO → X + H2O

Choose the option representing the correct percentage content of ethanol in its different types.

The products formed in the direct substitution of alkanes with halogens can be seperated by

If carbon does not conduct electricity then why does graphite?

The volume of 1 mole of an ideal gas at 25∘C temperature and 1 bar pressure is:

why are metals like sodium potassium and lithium soft in nature unlike other metals?

Choose the correct sequence for extraction of metal from its ore. i) Concentration of ore ii) Reduction of metallic oxides iii) Conversion of the ore into its oxide iv) Refining of impure metal

IUPAC name for: [2 MARKS] 1. CH3CH2Br 2. HCHO

Covalent bond is formed between:

Which of the following statements is correct?

The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period

Analyse the elements given below and identify ‘X’ if the given elements are forming Dobereiner's triad. Li (6.9), Na (X), K (39.0)

Hydrogen can be placed in group 1 and group 17 of periodic table. Why?

Which of the following carbon compound is used as a solvent?

The atomic number of an element is more important to the chemist than its relative atomic mass. Why?

The atomic number of an element 'X' is 15 . Identify its position in the modern periodic table

Wires that carry current in our home have a coating of polyvinylchloride or a rubber like material why are electrical wires coated with such substsnces

The chlorination of alkanes is initiated by homolysis of chlorine molecule because:

Balance the following equation by short-cut method, and write the coefficient for O2 C5H11NH2+O2→CO2+H2O+NO2 ___.

Maximum number of electrons is present in O2

A student puts down his signature in graphite pencil. If the mass of carbon in the signature is 10−12 g. Calculate the number of atoms in the signature.

When barium chloride is added to soluble magnesium sulphate, a white precipitate X is formed. What is X?

Hydrogen sulphide gets oxidised to ___by conc. sulphuric acid.

What is meant by skeltal type chemical equation? What does it represent ? Using thee equation for elecrolytic decompostion of water and also differentiate between skeltal chemical eqaution and a balanced chemical equation?

Explain the process of EMULSIFICATION

Explain the physical nature of carbon and its compounds.

List some uses of iron in our everyday life.

One roentgen is defined as the quantity of radiation which produces ‘x’ pairs of ion in 1 gram of air. The value of ‘x’ is:

The black coating on silver is due to:

Which of the following contains both polar and non-polar bonds –

What is the difference between alkali and alkaline??

Charged comb attract pieces of paper, but a charged battery doesn't, why?

On comparison with water, which of these is true about sulphuric acid?