15280 + Interview Questions in Chemistry Page 265 InterviewSolution

13201.	What are polar covalent bond?
Answer» What are polar covalent bond?

Discussion

13202.	Name the scientists who gave the following laws in the early classification of elements: (a) Law of octaves (b) Law of triads
Answer» Name the scientists who gave the following laws in the early classification of elements: (a) Law of octaves (b) Law of triads

13202.

Name the scientists who gave the following laws in the early classification of elements: (a) Law of octaves (b) Law of triads

Answer»

Name the scientists who gave the following laws in the early classification of elements:

(a) Law of octaves (b) Law of triads

Discussion

13203.	A food chain comprises of a cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be : (a) cat (b) plants (c) dog (d) seed-eating bird
Answer» A food chain comprises of a cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be : (a) cat (b) plants (c) dog (d) seed-eating bird

13203.

A food chain comprises of a cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be : (a) cat (b) plants (c) dog (d) seed-eating bird

Answer»

A food chain comprises of a cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be :

(a) cat (b) plants (c) dog (d) seed-eating bird

Discussion

13204.	The oxide which is not acidic is:
Answer» The oxide which is not acidic is:

Discussion

13205.	(a) Give the general formula of an : (i) alkane (ii) alkene (iii) alkyne. (b) Classify the following compounds as alkanes, alkenes and alkynes : C2H4, C3H4, C4H8, C5H12, C5H8, C3H8, C6H6
Answer» (a) Give the general formula of an : (i) alkane (ii) alkene (iii) alkyne. (b) Classify the following compounds as alkanes, alkenes and alkynes : $C_{2} H_{4}, C_{3} H_{4}, C_{4} H_{8}, C_{5} H_{12}, C_{5} H_{8}, C_{3} H_{8}, C_{6} H_{6}$

Discussion

13206.	Ammonia gas dissolves in water to give ammonium ion.In this reaction water acts as an ___ .
Answer» Ammonia gas dissolves in water to give ammonium ion.In this reaction water acts as an ___ .

Discussion

13207.	Which of the following gas is formed when potassium sulphite reacts with dilute nitric acid?
Answer» Which of the following gas is formed when potassium sulphite reacts with dilute nitric acid?

Discussion

13208.	Li has 1 electron in its valence shell, Cl has 7 electrons in its valence shell. Choose the correct option:
Answer» Li has 1 electron in its valence shell, Cl has 7 electrons in its valence shell. Choose the correct option:

Discussion

13209.	Rusting of iron can be prevented by which of the following methods?
Answer» Rusting of iron can be prevented by which of the following methods?

Discussion

13210.	IsotopeRelative Abudance(%)Atomic Mass(amu)12C98.8921213C1.10813.0033514C2×10−1014.00317 From the data given in the table, calculate the average atomic mass of C
Answer» $\begin{matrix} Isotope & Relative Abudance (%) & Atomic Mass(amu)^{12} C & 98.892 & 12^{13} C & 1.108 & 13.00335^{14} C & 2 \times 10^{- 10} & 14.00317 \end{matrix}$ From the data given in the table, calculate the average atomic mass of C

13210.

IsotopeRelative Abudance(%)Atomic Mass(amu)12C98.8921213C1.10813.0033514C2×10−1014.00317 From the data given in the table, calculate the average atomic mass of C

Answer»

$\begin{matrix} Isotope & Relative Abudance (%) & Atomic Mass(amu)^{12} C & 98.892 & 12^{13} C & 1.108 & 13.00335^{14} C & 2 \times 10^{- 10} & 14.00317 \end{matrix}$

From the data given in the table, calculate the average atomic mass of C

Discussion

13211.	(a) What is diamond? Of what substance is diamond made? (b) Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond. (c) Explain why, diamond has a high melting point. (d) State any two uses of diamond.
Answer» (a) What is diamond? Of what substance is diamond made? (b) Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond. (c) Explain why, diamond has a high melting point. (d) State any two uses of diamond.

Discussion

13212.	In the reaction below,___ is used for seeding. NaAlO2 + 2H2O50∘C−60∘C−−−−−−−→ NaOH + Al(OH)3↓
Answer» In the reaction below,___ is used for seeding. $N a A l O_{2} + 2 H_{2} O 50^{\circ} C - 60^{\circ} C - ------ \to N a O H + A l (O H)_{3} ↓$

13212.

In the reaction below,___ is used for seeding. NaAlO2 + 2H2O50∘C−60∘C−−−−−−−→ NaOH + Al(OH)3↓

Answer»

In the reaction below,___ is used for seeding.

$N a A l O_{2} + 2 H_{2} O 50^{\circ} C - 60^{\circ} C - ------ \to N a O H + A l (O H)_{3} ↓$

Discussion

13213.	Differentiate between electrolytic refining and electrolytic reduction
Answer» Differentiate between electrolytic refining and electrolytic reduction

Discussion

13214.	What can we say about the nature of alcohol in a solution?
Answer» What can we say about the nature of alcohol in a solution?

Discussion

13215.	The IUPAC of the given compound is
Answer» The IUPAC of the given compound is

13215.

The IUPAC of the given compound is

Answer»

The IUPAC of the given compound is

Discussion

13216.	Write harmful effects of corrosion.
Answer» Write harmful effects of corrosion.

Discussion

13217.	Why do we check the solubility of salt in water by only using distiled water?
Answer» Why do we check the solubility of salt in water by only using distiled water?

13217.

Why do we check the solubility of salt in water by only using distiled water?

Answer»

Why do we check the solubility of salt in water by

only using distiled water?

Discussion

13218.	When blue litmus paper is dipped into the water, the colour of litmus paper remains same. Similarly, when red litmus paper is dipped into the water, the colour remains same. By the above observation, we can conclude that:
Answer» When blue litmus paper is dipped into the water, the colour of litmus paper remains same. Similarly, when red litmus paper is dipped into the water, the colour remains same. By the above observation, we can conclude that:

Discussion

13219.	Define exothermic and endothermic changes. Give two examples in each case.
Answer» Define exothermic and endothermic changes. Give two examples in each case.

Discussion

13220.	Which of the following are correct about - He, Ne etc?
Answer» Which of the following are correct about - He, Ne etc?

Discussion

13221.	Which among the following is a biotic component?
Answer» Which among the following is a biotic component?

13221.

Which among the following is a biotic component?

Answer»

Which among the following is a biotic component?

Discussion

13222.	What is catalyst
Answer» What is catalyst

Discussion

13223.	Name the following structure:
Answer» Name the following structure:

13223.

Name the following structure:

Answer»

Name the following structure:

Discussion

13224.	all members of homologous series can be represented by Cn H2n+2 . why?
Answer» all members of homologous series can be represented by Cn H2n+2 . why?

Discussion

13225.	1.what is making and breaking of bonds in a chemical reaction called. 2.two chemical reactions in which water acts as reducing and oxidising agents.
Answer» 1.what is making and breaking of bonds in a chemical reaction called. 2.two chemical reactions in which water acts as reducing and oxidising agents.

13225.

1.what is making and breaking of bonds in a chemical reaction called. 2.two chemical reactions in which water acts as reducing and oxidising agents.

Answer»

1.what is making and breaking of bonds in a chemical reaction called.

2.two chemical reactions in which water acts as reducing and oxidising agents.

Discussion

13226.	(a) A gas cylinder of capacity of 20dm3 is filled with gas X the mass of which is 10 g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass fo the hydrogen is 2 g, hence the relative molecular mass of the gas is : (i) 5 (ii) 10 (iii) 15 (iv) 20 (b) (i) Calcium carbide is used for the artificial ripening of fruits. Actually the fruit ripens beause fo the heat evolved while calcium carbide reacts with and acetylene gas is formed. If 200cm3 of acetylene is formed from a certain mass of calcium carbidem, find the volume of oxygen required and carbon dioxide formed during the complete combustion. The combustion reaction can be represented as below. 2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g) (ii) A gaseous compound of nitrogen and hydrogen contains 12.5% hydrogenj by mass. Find the molecular formula of the ocmpound if its relative molecular mass is 37.[N=14,H=1]. (c) (i) A gas cylinder contains 24×1024 moleules of nitrogen gas. If avogadro's number is 6×1023 and the relative atomic mass of nitrogen is 14, calculate: (1) Mass of nitrogen gas in th ecylinder (2) Volume of nitrogen at STP in dm3 (ii) Commercial sodium hydroxide wieghing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excesss silver nitrate solution formed a precipitate weighing 14.3 g. What is the percentage fo sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is NaCl+AgNO3→AgCl+NaNO3 [Relative molecular mass of NaCl=58;AgCl=143] (iii) A certain Gas 'X' occupies a volume of 100cm3 at S.T.P. and weighs 0.5 g. Find its relative moleular mass.
Answer» (a) A gas cylinder of capacity of $20 d m^{3}$ is filled with gas X the mass of which is 10 g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass fo the hydrogen is 2 g, hence the relative molecular mass of the gas is : (i) 5 (ii) 10 (iii) 15 (iv) 20 (b) (i) Calcium carbide is used for the artificial ripening of fruits. Actually the fruit ripens beause fo the heat evolved while calcium carbide reacts with and acetylene gas is formed. If $200 c m^{3}$ of acetylene is formed from a certain mass of calcium carbidem, find the volume of oxygen required and carbon dioxide formed during the complete combustion. The combustion reaction can be represented as below. $2 C_{2} H_{2} (g) + 5 O_{2} (g) \to 4 C O_{2} (g) + 2 H_{2} O (g)$ (ii) A gaseous compound of nitrogen and hydrogen contains 12.5% hydrogenj by mass. Find the molecular formula of the ocmpound if its relative molecular mass is 37. $[N = 14, H = 1] .$ (c) (i) A gas cylinder contains $24 \times 10^{24}$ moleules of nitrogen gas. If avogadro's number is $6 \times 10^{23}$ and the relative atomic mass of nitrogen is 14, calculate: (1) Mass of nitrogen gas in th ecylinder (2) Volume of nitrogen at STP in $d m^{3}$ (ii) Commercial sodium hydroxide wieghing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excesss silver nitrate solution formed a precipitate weighing 14.3 g. What is the percentage fo sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is $N a C l + A g N O_{3} \to A g C l + N a N O_{3}$ [Relative molecular mass of $N a C l = 58; A g C l = 143$ ] (iii) A certain Gas 'X' occupies a volume of $100 c m^{3}$ at S.T.P. and weighs 0.5 g. Find its relative moleular mass.

Discussion

13227.	What does a galvanic cell contain: a voltmeter or an ammeter?
Answer» What does a galvanic cell contain: a voltmeter or an ammeter?

Discussion

13228.	Why can't we have isomers of first two members of alkane series?
Answer» Why can't we have isomers of first two members of alkane series?

Discussion

13229.	Plz explain the role of a carbocation in a complex chemical reaction. Thank you.
Answer» Plz explain the role of a carbocation in a complex chemical reaction. Thank you.

Discussion

13230.	The valance electrons of Carbon atom are:
Answer» The valance electrons of Carbon atom are:

Discussion

13231.	Question 16 Structural formula of benzene is (a) (b) (c) (d)
Answer» Question 16 Structural formula of benzene is (a) (b) (c) (d)

Discussion

13232.	State the relationship between oxidation and oxidising agent in a redox reaction. Give an example of redox reaction showing the relationship between oxidation and oxidising agent.
Answer» State the relationship between oxidation and oxidising agent in a redox reaction. Give an example of redox reaction showing the relationship between oxidation and oxidising agent.

Discussion

13233.	Question 1 (ii) Give an example of a metal which can be easily cut with a knife.
Answer» Question 1 (ii) Give an example of a metal which can be easily cut with a knife.

Discussion

13234.	Which one of the following is not a terrestrial ecosystem? Forest, Grassland, Aquarium, Desert
Answer» Which one of the following is not a terrestrial ecosystem? Forest, Grassland, Aquarium, Desert

Discussion

13235.	Dipole-dipole forces act between molecules possessing:
Answer» Dipole-dipole forces act between molecules possessing:

Discussion

13236.	(a) What type of compound is CH3−COOH : (b) What substance should be oxidised to prepare CH3−COOH? (c) State one advantage of soaps over detergents.
Answer» (a) What type of compound is $C H_{3} - C O O H$ : (b) What substance should be oxidised to prepare $C H_{3} - C O O H$ ? (c) State one advantage of soaps over detergents.

Discussion

13237.	How many orbitals are formed when one s orbital and three p orbitals hybridise?4
Answer» How many orbitals are formed when one s orbital and three p orbitals hybridise? 4

Discussion

13238.	Write balanced chemical equation for the following: Ferric hydroxide reacts with nitric acid.
Answer» Write balanced chemical equation for the following: Ferric hydroxide reacts with nitric acid.

13238.

Write balanced chemical equation for the following: Ferric hydroxide reacts with nitric acid.

Answer»

Write balanced chemical equation for the following:

Ferric hydroxide reacts with nitric acid.

Discussion

13239.	The correct formula for the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation called as rust is
Answer» The correct formula for the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation called as rust is

Discussion

13240.	In the gaseous phase, the sigma O – S – O bond angle in the SO3 molecule is degrees.
Answer» In the gaseous phase, the sigma O – S – O bond angle in the $S O_{3}$ molecule is degrees.

Discussion

13241.	Which of the following weighs the least? (a) 2 g atom of N (b) 3×1025 atoms of carbon (c) 1 mole fo sulphur (d) 7 g silver
Answer» Which of the following weighs the least? (a) 2 g atom of N (b) $3 \times 10^{25}$ atoms of carbon (c) 1 mole fo sulphur (d) 7 g silver

Discussion

13242.	Why does carbon form a large number of compounds?
Answer» Why does carbon form a large number of compounds?

Discussion

13243.	Slide the number of water molecules present in washing soda.10
Answer» Slide the number of water molecules present in washing soda. 10

Discussion

13244.	Question 48 (b) (a) Electropositive nature of the element(s) increases down the group and decreases across the period (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increases down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Name the most electronegative element.
Answer» Question 48 (b) (a) Electropositive nature of the element(s) increases down the group and decreases across the period (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increases down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period. On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. Name the most electronegative element.

Discussion

13245.	Kartik started a firm on 1st April, 2015 with a capital of Rs. 30,000. On 1st July 2015, he borrowed from his wife a sum of Rs. 12,000 9% per annum (interest not yet paid) for business and introduce a further capital of his own amounted to Rs. 4,500. On 31st March, 2016 his position was, cash Rs. 1,800, stock Rs. 28,200, debtors Rs. 21,000 and creditors Rs. 18,000. Ascertain his profit or loss taking into account Rs 6,000 for his drawings during the year.
Answer» Kartik started a firm on 1st April, 2015 with a capital of Rs. 30,000. On 1st July 2015, he borrowed from his wife a sum of Rs. 12,000 $9 %$ per annum (interest not yet paid) for business and introduce a further capital of his own amounted to Rs. 4,500. On 31st March, 2016 his position was, cash Rs. 1,800, stock Rs. 28,200, debtors Rs. 21,000 and creditors Rs. 18,000. Ascertain his profit or loss taking into account Rs 6,000 for his drawings during the year.

13245.

Kartik started a firm on 1st April, 2015 with a capital of Rs. 30,000. On 1st July 2015, he borrowed from his wife a sum of Rs. 12,000 9% per annum (interest not yet paid) for business and introduce a further capital of his own amounted to Rs. 4,500. On 31st March, 2016 his position was, cash Rs. 1,800, stock Rs. 28,200, debtors Rs. 21,000 and creditors Rs. 18,000. Ascertain his profit or loss taking into account Rs 6,000 for his drawings during the year.

Answer»

Kartik started a firm on 1st April, 2015 with a capital of Rs. 30,000. On 1st July 2015, he borrowed from his wife a sum of Rs. 12,000 $9 %$ per annum (interest not yet paid) for business and introduce a further capital of his own amounted to Rs. 4,500. On 31st March, 2016 his position was, cash Rs. 1,800, stock Rs. 28,200, debtors Rs. 21,000 and creditors Rs. 18,000.

Ascertain his profit or loss taking into account Rs 6,000 for his drawings during the year.

Discussion

13246.	According to the ideal gas law, PV is equal to
Answer» According to the ideal gas law, PV is equal to

Discussion

13247.	A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air. (a) Name the meta and write its chemical symbol. (b) Write the name and formula of the sulphide ore. (c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore. (d) Name a common device in which this metal is used. (e) Can this metal displace copper from copper sulphate solution? Why
Answer» A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air. (a) Name the meta and write its chemical symbol. (b) Write the name and formula of the sulphide ore. (c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore. (d) Name a common device in which this metal is used. (e) Can this metal displace copper from copper sulphate solution? Why

Discussion

13248.	Question 1 Upto which element, the Law of Octaves was found to be applicable (a) Oxygen (b) Calcium (c) Cobalt (d) Potassium
Answer» Question 1 Upto which element, the Law of Octaves was found to be applicable (a) Oxygen (b) Calcium (c) Cobalt (d) Potassium

Discussion

13249.	Which of the following metal on reaction with hydrochloric acid does not form bubbles in the solution?
Answer» Which of the following metal on reaction with hydrochloric acid does not form bubbles in the solution?

Discussion

13250.	Which of the following is a ferrous alloy?
Answer» Which of the following is a ferrous alloy?

Discussion

Explore topic-wise InterviewSolutions in .

What are polar covalent bond?

Name the scientists who gave the following laws in the early classification of elements: (a) Law of octaves (b) Law of triads

A food chain comprises of a cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be : (a) cat (b) plants (c) dog (d) seed-eating bird

The oxide which is not acidic is:

(a) Give the general formula of an : (i) alkane (ii) alkene (iii) alkyne. (b) Classify the following compounds as alkanes, alkenes and alkynes : C2H4, C3H4, C4H8, C5H12, C5H8, C3H8, C6H6

Ammonia gas dissolves in water to give ammonium ion.In this reaction water acts as an ___ .

Which of the following gas is formed when potassium sulphite reacts with dilute nitric acid?

Li has 1 electron in its valence shell, Cl has 7 electrons in its valence shell. Choose the correct option:

Rusting of iron can be prevented by which of the following methods?

IsotopeRelative Abudance(%)Atomic Mass(amu)12C98.8921213C1.10813.0033514C2×10−1014.00317 From the data given in the table, calculate the average atomic mass of C

(a) What is diamond? Of what substance is diamond made? (b) Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond. (c) Explain why, diamond has a high melting point. (d) State any two uses of diamond.

In the reaction below,___ is used for seeding. NaAlO2 + 2H2O50∘C−60∘C−−−−−−−→ NaOH + Al(OH)3↓

Differentiate between electrolytic refining and electrolytic reduction

What can we say about the nature of alcohol in a solution?

The IUPAC of the given compound is

Write harmful effects of corrosion.

Why do we check the solubility of salt in water by only using distiled water?

When blue litmus paper is dipped into the water, the colour of litmus paper remains same. Similarly, when red litmus paper is dipped into the water, the colour remains same. By the above observation, we can conclude that:

Define exothermic and endothermic changes. Give two examples in each case.

Which of the following are correct about - He, Ne etc?

Which among the following is a biotic component?

What is catalyst

Name the following structure:

all members of homologous series can be represented by Cn H2n+2 . why?

1.what is making and breaking of bonds in a chemical reaction called. 2.two chemical reactions in which water acts as reducing and oxidising agents.

What does a galvanic cell contain: a voltmeter or an ammeter?

Why can't we have isomers of first two members of alkane series?

Plz explain the role of a carbocation in a complex chemical reaction. Thank you.

The valance electrons of Carbon atom are:

Question 16 Structural formula of benzene is (a) (b) (c) (d)

State the relationship between oxidation and oxidising agent in a redox reaction. Give an example of redox reaction showing the relationship between oxidation and oxidising agent.

Question 1 (ii) Give an example of a metal which can be easily cut with a knife.

Which one of the following is not a terrestrial ecosystem? Forest, Grassland, Aquarium, Desert

Dipole-dipole forces act between molecules possessing:

(a) What type of compound is CH3−COOH : (b) What substance should be oxidised to prepare CH3−COOH? (c) State one advantage of soaps over detergents.

How many orbitals are formed when one s orbital and three p orbitals hybridise?4

Write balanced chemical equation for the following: Ferric hydroxide reacts with nitric acid.

The correct formula for the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation called as rust is

In the gaseous phase, the sigma O – S – O bond angle in the SO3 molecule is degrees.

Which of the following weighs the least? (a) 2 g atom of N (b) 3×1025 atoms of carbon (c) 1 mole fo sulphur (d) 7 g silver

Why does carbon form a large number of compounds?

Slide the number of water molecules present in washing soda.10

According to the ideal gas law, PV is equal to

Question 1 Upto which element, the Law of Octaves was found to be applicable (a) Oxygen (b) Calcium (c) Cobalt (d) Potassium

Which of the following metal on reaction with hydrochloric acid does not form bubbles in the solution?

Which of the following is a ferrous alloy?