15280 + Interview Questions in Chemistry Page 39 InterviewSolution

1901.	In manganese dioxide test, the green fumes of confirm the presence of hydrochloric acid.
Answer» In manganese dioxide test, the green fumes of confirm the presence of hydrochloric acid.

Discussion

1902.	Identify X and Y in the reaction given below.Zn(s) + 2HCl(aq)→X + Y
Answer» Identify X and Y in the reaction given below. $Zn(s) + 2HCl(aq) \to X + Y$

Discussion

1903.	12.Energy level digram of bonding molecular orbital .
Answer» 12.Energy level digram of bonding molecular orbital .

Discussion

1904.	In a soap micelle, the soap molecules are arranged radially with : (a) ionic ends directed towards the centre and hydrocarbon ends directed outwards (b) hydrocarbon ends directed towards the centre and ionic ends directed outwards (c) both ionic ends and hydrocarbon ends directed towards the centre (d) both hydrocarbon ends and ionic ends directed outwards
Answer» In a soap micelle, the soap molecules are arranged radially with : (a) ionic ends directed towards the centre and hydrocarbon ends directed outwards (b) hydrocarbon ends directed towards the centre and ionic ends directed outwards (c) both ionic ends and hydrocarbon ends directed towards the centre (d) both hydrocarbon ends and ionic ends directed outwards

Discussion

1905.	Which of the following is/are thermochemical reaction(s)?
Answer» Which of the following is/are thermochemical reaction(s)?

Discussion

1906.	57. When 4 moles of H2 react with 2 mole of o2 the then 4mole of water formed
Answer» 57. When 4 moles of H2 react with 2 mole of o2 the then 4mole of water formed

Discussion

1907.	cal. equilibrium constant at 298K FOR reaction 2Fe+3 +3I-1=2Fe+2 +I3 -1. the standard red potential in acidic medium are 0.77,0.54 forFe+3/Fe+2 and I3-1/I-1 couples
Answer» cal. equilibrium constant at 298K FOR reaction 2Fe+3 +3I-1=2Fe+2 +I3 -1. the standard red potential in acidic medium are 0.77,0.54 forFe+3/Fe+2 and I3-1/I-1 couples

Discussion

1908.	A compound X is made to react with concentrated hydrochloric acid. The product formed by this reaction is Y. The compound Y is made to react with Z which results in the production of a brown precipitate. Identify X, Y and Z.
Answer» A compound X is made to react with concentrated hydrochloric acid. The product formed by this reaction is Y. The compound Y is made to react with Z which results in the production of a brown precipitate. Identify X, Y and Z.

Discussion

1909.	the heat of aromatistion of of PH3 is 228 that of P2H2 IS 355 the energy OF P-P i
Answer» the heat of aromatistion of of PH3 is 228 that of P2H2 IS 355 the energy OF P-P i

Discussion

1910.	Name the important process that starts with the reaction in (3-iv). Name the catalyst used.
Answer» Name the important process that starts with the reaction in (3-iv). Name the catalyst used.

Discussion

1911.	_______ are substances that can absorb moisture from other substances without chemically reacting with them.
Answer» _______ are substances that can absorb moisture from other substances without chemically reacting with them.

Discussion

1912.	6.5 g of an impure sample of limestone liberates2.2 g of CO2 on strong heating. The percentagepurity of CaCO3 in the sample is(1) 85.2%(2) 76.9%(3 72.5%(4)925%
Answer» 6.5 g of an impure sample of limestone liberates2.2 g of CO2 on strong heating. The percentagepurity of CaCO3 in the sample is(1) 85.2%(2) 76.9%(3 72.5%(4)925%

Discussion

1913.	Among alkali metals __ has the smallest atomic radius.
Answer» Among alkali metals __ has the smallest atomic radius.

Discussion

1914.	Give reasons for the following.(a) Aluminiumfoils are used to wrap food items.(b) Immersionrods for heating liquids are made up of metallic substances.(c) Coppercannot displace zinc from its salt solution.(d) Sodiumand potassium are stored in kerosene.
Answer» Give reasons for the following. (a) Aluminium foils are used to wrap food items. (b) Immersion rods for heating liquids are made up of metallic substances. (c) Copper cannot displace zinc from its salt solution. (d) Sodium and potassium are stored in kerosene.

1914.

Give reasons for the following.(a) Aluminiumfoils are used to wrap food items.(b) Immersionrods for heating liquids are made up of metallic substances.(c) Coppercannot displace zinc from its salt solution.(d) Sodiumand potassium are stored in kerosene.

Answer»

Give reasons for the following.

(a) Aluminium
foils are used to wrap food items.

(b) Immersion
rods for heating liquids are made up of metallic substances.

(c) Copper
cannot displace zinc from its salt solution.

(d) Sodium
and potassium are stored in kerosene.

Discussion

1915.	Match the metals with their respective uses Metal Uses of Metals(p)Fe1)Bone building(q)Na and K2)Photosynthesis(r)Ca3)Haemoglobin(s)Mg4)Control of Nervous system
Answer» Match the metals with their respective uses $\begin{matrix} Metal & Uses of Metals (p) & F e & 1) & Bone building (q) & N a and K & 2) & Photosynthesis (r) & C a & 3) & Haemoglobin (s) & M g & 4) & Control of Nervous system \end{matrix}$

Discussion

1916.	1. One mole is the amouunt of subs†an ce that contains as many particles as there are atoms in exactly 12 gram of the C-12 isotope. 2. One mole of any subs†an ce contains 6.023 x 10^{24^{}} particles. Are the statements 1 and 2 correct ?
Answer» 1. One mole is the amouunt of subs†an ce that contains as many particles as there are atoms in exactly 12 gram of the C-12 isotope. 2. One mole of any subs†an ce contains 6.023 x 10^{24^{}} particles. Are the statements 1 and 2 correct ?

Discussion

1917.	How many primary amines are possible for the formula C4H11N?
Answer» How many primary amines are possible for the formula $C_{4} H_{11} N$ ?

Discussion

1918.	Molarity of H_2SO_4 is 8 and density is 1.06g/ml . What will be its concentration in terms of molality and mole fraction
Answer» Molarity of H_2SO_4 is 8 and density is 1.06g/ml . What will be its concentration in terms of molality and mole fraction

Discussion

1919.	I able to understant this line from our book - A degree (or temperature difference ) is same on both the celsius and kelvin scales i.e.., 🔺️t°C=🔺️Tk
Answer» I able to understant this line from our book - A degree (or temperature difference ) is same on both the celsius and kelvin scales i.e.., 🔺️t°C=🔺️Tk

1919.

I able to understant this line from our book - A degree (or temperature difference ) is same on both the celsius and kelvin scales i.e.., 🔺️t°C=🔺️Tk

Answer»

I able to understant this line from our book -

A degree (or temperature difference ) is same on both the celsius and kelvin scales i.e.., 🔺️t°C=🔺️Tk

Discussion

1920.	Which gas is evolved when green vitriol is heated?
Answer» Which gas is evolved when green vitriol is heated?

Discussion

1921.	When an aqueous solution of sodium sulphate is electrolysed, on cathode we get:
Answer» When an aqueous solution of sodium sulphate is electrolysed, on cathode we get:

Discussion

1922.	determine the solubilities of silverchromate(Ksp=1.1×10∧-12), barium chromate(1.2×10∧-10), ferric hydroxide(1×10∧-38) , lead chloride(1.6×10∧-5) and mercurous iodide(4.5×10∧-29) at 298K. also determine molarity of individual ion
Answer» determine the solubilities of silverchromate(Ksp=1.1×10∧-12), barium chromate(1.2×10∧-10), ferric hydroxide(1×10∧-38) , lead chloride(1.6×10∧-5) and mercurous iodide(4.5×10∧-29) at 298K. also determine molarity of individual ion

Discussion

1923.	Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of lead acetate solution to it, a white precipitate is formed. This indicates the presence of:
Answer» Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of lead acetate solution to it, a white precipitate is formed. This indicates the presence of:

Discussion

1924.	Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.
Answer» Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.

Discussion

1925.	Colour of Methly Orange in Neutral Solutions
Answer» Colour of Methly Orange in Neutral Solutions

Discussion

1926.	The standard reduction potentials of Ag, Cu, Co and Zn is 0.799 V,0.337 V,−0.277 V,−0.762 V respectively. Which of the following cells will have maximum cell e.m.f. value?
Answer» The standard reduction potentials of $Ag, Cu, Co and Zn$ is $0.799 V, 0.337 V, - 0.277 V, - 0.762 V$ respectively. Which of the following cells will have maximum cell e.m.f. value?

Discussion

1927.	What plane waves its electromagnetic wave or anything else
Answer» What plane waves its electromagnetic wave or anything else

Discussion

1928.	nt. Element with electronic configuration 1s2 is placed in (1) s-block (2) p-block (3) Group 3 (4) d-blockn
Answer» nt. Element with electronic configuration 1s2 is placed in (1) s-block (2) p-block (3) Group 3 (4) d-blockn

Discussion

1929.	Define an anion and cation. Give two examples of compounds and label their cation and anion.
Answer» Define an anion and cation. Give two examples of compounds and label their cation and anion.

Discussion

1930.	Find the odd one out from the following and explain your choice:Al(OH)3, Pb(OH)2, Mg(OH)2, Zn(OH)2
Answer» Find the odd one out from the following and explain your choice: Al(OH)₃, Pb(OH)₂, Mg(OH)₂, Zn(OH)₂

Discussion

1931.	The acid produced naturally in our stomach is : (a) acetic acid (b) citric acid (c) hydrochloric acid (d) sulphuric acid
Answer» The acid produced naturally in our stomach is : (a) acetic acid (b) citric acid (c) hydrochloric acid (d) sulphuric acid

1931.

The acid produced naturally in our stomach is : (a) acetic acid (b) citric acid (c) hydrochloric acid (d) sulphuric acid

Answer»

The acid produced naturally in our stomach is :

(a) acetic acid

(b) citric acid

(c) hydrochloric acid

(d) sulphuric acid

Discussion

1932.	What do you understand by " Carbon is tetravalent compund "
Answer» What do you understand by " Carbon is tetravalent compund "

Discussion

1933.	BaO has a rock-salt type structure. When subjected to high pressure, the ratio of the coordination number of Ba+2 ion to O−2 changes to
Answer» $B a O$ has a rock-salt type structure. When subjected to high pressure, the ratio of the coordination number of $B a^{+ 2} ion to O^{- 2}$ changes to

Discussion

1934.	The resistance of 0.05 M NaOH solution is 36.1 Ω and cell constant is 0.357 cm−1. Calculate its molar conductivity.
Answer» The resistance of $0.05 M N a O H$ solution is $36.1 Ω$ and cell constant is $0.357 c m^{- 1}$ . Calculate its molar conductivity.

Discussion

1935.	the internal energy of 10 gm of nitrogen at NTP is about
Answer» the internal energy of 10 gm of nitrogen at NTP is about

Discussion

1936.	What is the proper definition of mole?
Answer» What is the proper definition of mole?

Discussion

1937.	(a) A vessel contains N molecules of oxygen at a certain temperature and pressure. How many molecules of sulphur dioxide can the vessel accommodate at the same temperature and pressure?(b) Each of the two flasks contain 2.0 g of gas at the same temperature and pressure. One flask contains oxygen and the other hydrogen.(i) Which sample contains the greater number of molecules?(ii) If the hydrogen sample contains N molecules, how many molecules are present in oxygen sample?
Answer» (a) A vessel contains N molecules of oxygen at a certain temperature and pressure. How many molecules of sulphur dioxide can the vessel accommodate at the same temperature and pressure? (b) Each of the two flasks contain 2.0 g of gas at the same temperature and pressure. One flask contains oxygen and the other hydrogen. (i) Which sample contains the greater number of molecules? (ii) If the hydrogen sample contains N molecules, how many molecules are present in oxygen sample?

Discussion

1938.	will methoxyethane react with 2,4-dinitrophenylhydrazine and Na metal?explain
Answer» will methoxyethane react with 2,4-dinitrophenylhydrazine and Na metal?explain

Discussion

1939.	an organic compound (a) with molecular formula C8H80 forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. It neither reduces Tollen`s or Fehlings` reagent , nor does it decolourise bromine water or baeyer`s reagent . on drastic oxidation with chromic acid ,it gives a carboxylic acid (b) having molecular formula C7H6O2. identify the compounds (a) and (b) and explain the reactions involved.
Answer» an organic compound (a) with molecular formula C8H80 forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. It neither reduces Tollen`s or Fehlings` reagent , nor does it decolourise bromine water or baeyer`s reagent . on drastic oxidation with chromic acid ,it gives a carboxylic acid (b) having molecular formula C7H6O2. identify the compounds (a) and (b) and explain the reactions involved.

Discussion

1940.	Can fire ne recognised as plasma because it is formed when a compound of butane and propane is charged
Answer» Can fire ne recognised as plasma because it is formed when a compound of butane and propane is charged

Discussion

1941.	Why does Hydrogen not have a neutron?
Answer» Why does Hydrogen not have a neutron?

Discussion

1942.	(a) Name three acids used in the laboratory.(b) Name one indicator that turns red on adding a base.(c) Name the reaction when an acid is mixed with a base.(d) Write the name of two indicators that occur naturally.(e) Name three types of salts. Give one example of each type of salt.
Answer» (a) Name three acids used in the laboratory. (b) Name one indicator that turns red on adding a base. (c) Name the reaction when an acid is mixed with a base. (d) Write the name of two indicators that occur naturally. (e) Name three types of salts. Give one example of each type of salt.

1942.

(a) Name three acids used in the laboratory.(b) Name one indicator that turns red on adding a base.(c) Name the reaction when an acid is mixed with a base.(d) Write the name of two indicators that occur naturally.(e) Name three types of salts. Give one example of each type of salt.

Answer»

(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Name the reaction when an acid is mixed with a base.

(d) Write the name of two indicators that occur naturally.

(e) Name three types of salts. Give one example of each type of salt.

Discussion

1943.	Question 8.2Write the balanced chemical equation for the following and identify the type of reaction:Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g)
Answer» Question 8.2 Write the balanced chemical equation for the following and identify the type of reaction: Zinc carbonate (s) $\to$ Zinc oxide (s) + Carbon dioxide (g)

Discussion

1944.	An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula. [Atomic mass: C = 12, H = 1, Br = 80]
Answer» An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula. [Atomic mass: C = 12, H = 1, Br = 80]

1944.

An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula. [Atomic mass: C = 12, H = 1, Br = 80]

Answer»

An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula.

[Atomic mass: C = 12, H = 1, Br = 80]

Discussion

1945.	the no of atoms in 20gram S03 is approximately
Answer» the no of atoms in 20gram S03 is approximately

Discussion

1946.	what is hybridisation of chlorine in ClO2 ?
Answer» what is hybridisation of chlorine in ClO2 ?

Discussion

1947.	How many S-S bonds are there in S3O9?
Answer» How many S-S bonds are there in $S_{3} O_{9}$ ?

Discussion

1948.	Are the crystals of salts really dry
Answer» Are the crystals of salts really dry

Discussion

1949.	Which of the following is used as the drying agent in the purifying process of HCl gas ?
Answer» Which of the following is used as the drying agent in the purifying process of HCl gas ?

Discussion

1950.	What is hydrogenation? How hydrogenation of ethene occurs? Give one use of hydrogenation.
Answer» What is hydrogenation? How hydrogenation of ethene occurs? Give one use of hydrogenation.

Discussion

Explore topic-wise InterviewSolutions in .

In manganese dioxide test, the green fumes of confirm the presence of hydrochloric acid.

Identify X and Y in the reaction given below.Zn(s) + 2HCl(aq)→X + Y

12.Energy level digram of bonding molecular orbital .

Which of the following is/are thermochemical reaction(s)?

57. When 4 moles of H2 react with 2 mole of o2 the then 4mole of water formed

cal. equilibrium constant at 298K FOR reaction 2Fe+3 +3I-1=2Fe+2 +I3 -1. the standard red potential in acidic medium are 0.77,0.54 forFe+3/Fe+2 and I3-1/I-1 couples

A compound X is made to react with concentrated hydrochloric acid. The product formed by this reaction is Y. The compound Y is made to react with Z which results in the production of a brown precipitate. Identify X, Y and Z.

the heat of aromatistion of of PH3 is 228 that of P2H2 IS 355 the energy OF P-P i

Name the important process that starts with the reaction in (3-iv). Name the catalyst used.

_______ are substances that can absorb moisture from other substances without chemically reacting with them.

6.5 g of an impure sample of limestone liberates2.2 g of CO2 on strong heating. The percentagepurity of CaCO3 in the sample is(1) 85.2%(2) 76.9%(3 72.5%(4)925%

Among alkali metals __ has the smallest atomic radius.

Give reasons for the following.(a) Aluminiumfoils are used to wrap food items.(b) Immersionrods for heating liquids are made up of metallic substances.(c) Coppercannot displace zinc from its salt solution.(d) Sodiumand potassium are stored in kerosene.

Match the metals with their respective uses Metal Uses of Metals(p)Fe1)Bone building(q)Na and K2)Photosynthesis(r)Ca3)Haemoglobin(s)Mg4)Control of Nervous system

1. One mole is the amouunt of subs†an ce that contains as many particles as there are atoms in exactly 12 gram of the C-12 isotope. 2. One mole of any subs†an ce contains 6.023 x 10^{24^{}} particles. Are the statements 1 and 2 correct ?

How many primary amines are possible for the formula C4H11N?

Molarity of H_2SO_4 is 8 and density is 1.06g/ml . What will be its concentration in terms of molality and mole fraction

I able to understant this line from our book - A degree (or temperature difference ) is same on both the celsius and kelvin scales i.e.., 🔺️t°C=🔺️Tk

Which gas is evolved when green vitriol is heated?

When an aqueous solution of sodium sulphate is electrolysed, on cathode we get:

determine the solubilities of silverchromate(Ksp=1.1×10∧-12), barium chromate(1.2×10∧-10), ferric hydroxide(1×10∧-38) , lead chloride(1.6×10∧-5) and mercurous iodide(4.5×10∧-29) at 298K. also determine molarity of individual ion

Aqueous solution or sodium carbonate extract of the salt is acidified with acetic acid . On addition of lead acetate solution to it, a white precipitate is formed. This indicates the presence of:

Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.

Colour of Methly Orange in Neutral Solutions ​​​​​​

The standard reduction potentials of Ag, Cu, Co and Zn is 0.799 V,0.337 V,−0.277 V,−0.762 V respectively. Which of the following cells will have maximum cell e.m.f. value?

What plane waves its electromagnetic wave or anything else

nt. Element with electronic configuration 1s2 is placed in (1) s-block (2) p-block (3) Group 3 (4) d-blockn

Define an anion and cation. Give two examples of compounds and label their cation and anion.

Find the odd one out from the following and explain your choice:Al(OH)3, Pb(OH)2, Mg(OH)2, Zn(OH)2

The acid produced naturally in our stomach is : (a) acetic acid (b) citric acid (c) hydrochloric acid (d) sulphuric acid

What do you understand by " Carbon is tetravalent compund "

BaO has a rock-salt type structure. When subjected to high pressure, the ratio of the coordination number of Ba+2 ion to O−2 changes to

The resistance of 0.05 M NaOH solution is 36.1 Ω and cell constant is 0.357 cm−1. Calculate its molar conductivity.

the internal energy of 10 gm of nitrogen at NTP is about

What is the proper definition of mole?

will methoxyethane react with 2,4-dinitrophenylhydrazine and Na metal?explain

Can fire ne recognised as plasma because it is formed when a compound of butane and propane is charged

Why does Hydrogen not have a neutron?

(a) Name three acids used in the laboratory.(b) Name one indicator that turns red on adding a base.(c) Name the reaction when an acid is mixed with a base.(d) Write the name of two indicators that occur naturally.(e) Name three types of salts. Give one example of each type of salt.

Question 8.2Write the balanced chemical equation for the following and identify the type of reaction:Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g)

An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula. [Atomic mass: C = 12, H = 1, Br = 80]

the no of atoms in 20gram S03 is approximately

what is hybridisation of chlorine in ClO2 ?

How many S-S bonds are there in S3O9?

Are the crystals of salts really dry

Which of the following is used as the drying agent in the purifying process of HCl gas ?

What is hydrogenation? How hydrogenation of ethene occurs? Give one use of hydrogenation.

Colour of Methly Orange in Neutral Solutions