15280 + Interview Questions in Chemistry Page 104 InterviewSolution

5151.	A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:
Answer» A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:

Discussion

5152.	Name a metal which occurs free in nature.
Answer» Name a metal which occurs free in nature.

Discussion

5153.	How rancidity can be retarded by storing foods away from light?
Answer» How rancidity can be retarded by storing foods away from light?

Discussion

5154.	The chemical formula of vinegar is.
Answer» The chemical formula of vinegar is.

Discussion

5155.	A solution of common salt when added to silver nitrate solution yields a precipitate of silver chloride(0.28 g). Find the mass of sodium chloride in the solution.
Answer» A solution of common salt when added to silver nitrate solution yields a precipitate of silver chloride(0.28 g). Find the mass of sodium chloride in the solution.

Discussion

5156.	Among the following set of quantum numbers, the impossible set is:
Answer» Among the following set of quantum numbers, the impossible set is:

Discussion

5157.	State your observations for the following electrolytic reactions:(a) Solid copper sulphate is electrolysed between platinum electrodes.(b) Aqueous copper sulphate is electrolysed between platinum electrodes.(c) Aqueous copper sulphate is electrolysed between copper electrodes.
Answer» State your observations for the following electrolytic reactions: (a) Solid copper sulphate is electrolysed between platinum electrodes. (b) Aqueous copper sulphate is electrolysed between platinum electrodes. (c) Aqueous copper sulphate is electrolysed between copper electrodes.

Discussion

5158.	Aluminium chloride exists as a dimer (Al2Cl6) in solid state as well as in solution of non-polar solvents such as C6H6. When dissolved in water it gives:
Answer» Aluminium chloride exists as a dimer ( $A l_{2} C l_{6}$ ) in solid state as well as in solution of non-polar solvents such as $C_{6} H_{6}$ . When dissolved in water it gives:

Discussion

5159.	36. 2.2 g of CO2 and 2.24L of H2 at STP are mixed in a container. The total number of moles in the mixture will be
Answer» 36. 2.2 g of CO2 and 2.24L of H2 at STP are mixed in a container. The total number of moles in the mixture will be

Discussion

5160.	what is the pH of 0.5M aqueous solution of NaCN?given pkb of CN^-=4.7
Answer» what is the pH of 0.5M aqueous solution of NaCN?given pkb of CN^-=4.7

Discussion

5161.	51. The equivalent conductances of sodium acetate, sodium chloride and hydrochloric acid are 83,127 and 426 ohm cm2/eq at 250^° c respectively.calculate the equivalent conductance of acetic acid solution.
Answer» 51. The equivalent conductances of sodium acetate, sodium chloride and hydrochloric acid are 83,127 and 426 ohm cm2/eq at 250^° c respectively.calculate the equivalent conductance of acetic acid solution.

Discussion

5162.	How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state?
Answer» How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state?

Discussion

5163.	Mentor, I have a doubt in the topic properties of ethanol.
Answer» Mentor, I have a doubt in the topic properties of ethanol.

Discussion

5164.	Bases change the colour of methyl orange:
Answer» Bases change the colour of methyl orange:

Discussion

5165.	The enthalpy of neutralization of weak acid in 1 M solution of strong base is -56.1 Kilo joule per mole if the enthalpy of ionization of the acid is 1.5 kilojoule per mole and enthalpy of neutralization of strong acid with a strong base is -57.3 kilo joule per equivalent what is the percent ionization of weak acid in molar solution (assume the acid to be monobasic)
Answer» The enthalpy of neutralization of weak acid in 1 M solution of strong base is -56.1 Kilo joule per mole if the enthalpy of ionization of the acid is 1.5 kilojoule per mole and enthalpy of neutralization of strong acid with a strong base is -57.3 kilo joule per equivalent what is the percent ionization of weak acid in molar solution (assume the acid to be monobasic)

Discussion

5166.

Give the preparation of the salt given in the left column by matching with the methods given in the right column. Write balanced equations for each preparation. Salt Method of preparation Zinc sulphate Ferrous sulphide Barium sulphate Ferric sulphate Sodium sulphate Precipitation Oxidation Displacement Neutralisation synthesis

Answer» Give the preparation of the salt given in the left column by matching with the methods given in the right column. Write balanced equations for each preparation.

Salt	Method of preparation
Zinc sulphate Ferrous sulphide Barium sulphate Ferric sulphate Sodium sulphate	Precipitation Oxidation Displacement Neutralisation synthesis

Discussion

5167.	Find the number of possible isomers for C7H8O retaining the phenyl ring in all its isomers.
Answer» Find the number of possible isomers for $C_{7} H_{8} O$ retaining the phenyl ring in all its isomers.

Discussion

5168.	The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
Answer» The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.

Discussion

5169.	A gas 'P' gives dense white fumes with chlorine. Its aqueous solution gives a blue colour with copper (II) hydroxide. (a) Name the gas P. (b) Give its formula. (c) Give three uses of P.
Answer» A gas 'P' gives dense white fumes with chlorine. Its aqueous solution gives a blue colour with copper (II) hydroxide. (a) Name the gas P. (b) Give its formula. (c) Give three uses of P.

Discussion

5170.	77.How many electrons in a atom with atomic number 105 can have (n+l) =8 How many electrons in a atom with atomic number 105 can have (n+l) =8
Answer» 77.How many electrons in a atom with atomic number 105 can have (n+l) =8 How many electrons in a atom with atomic number 105 can have (n+l) =8

Discussion

5171.	What happens when a base reacts with a metal?
Answer» What happens when a base reacts with a metal?

Discussion

5172.	Question 1Which of the statements about the reaction below are incorrect?2PbO(s)+C(s)→2Pb (s)+CO2(g)(a) Lead is getting reduced.(b) Carbon dioxide is getting oxidized.(c) Carbon is getting oxidized.(d) Lead oxide is getting reduced.
Answer» Question 1 Which of the statements about the reaction below are incorrect? $2 PbO(s) + C(s) \to 2 Pb (s) + {CO}_{2} (g)$ (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidized. (c) Carbon is getting oxidized. (d) Lead oxide is getting reduced.

Discussion

5173.	Explain, why ammonia is evolved when water is added to the product formed, when magnesium is burnt in air.
Answer» Explain, why ammonia is evolved when water is added to the product formed, when magnesium is burnt in air.

Discussion

5174.	How many gm of solid NaOH must be added to 100 ml of a buffer solution which is 0.1M each w.r.t. Acand salt Na A to make the pH of solution 5.5. Given pk, (HA) = 5. (Use antilog (0.5) = 3.16)1(4) None of these(1) 2.08 x 10(3) 2.01 x 10-2(2) 3.05 x 1O3
Answer» How many gm of solid NaOH must be added to 100 ml of a buffer solution which is 0.1M each w.r.t. Acand salt Na A to make the pH of solution 5.5. Given pk, (HA) = 5. (Use antilog (0.5) = 3.16)1(4) None of these(1) 2.08 x 10(3) 2.01 x 10-2(2) 3.05 x 1O3

Discussion

5175.	Ultrasonic, Infrasonic and audible waves travel through a medium with speeds VU,Vi and Va respectively, then [CPMT 1989]
Answer» Ultrasonic, Infrasonic and audible waves travel through a medium with speeds $V_{U}, V_{i} a n d V_{a}$ respectively, then [CPMT 1989]

5175.

Ultrasonic, Infrasonic and audible waves travel through a medium with speeds VU,Vi and Va respectively, then [CPMT 1989]

Answer»

Ultrasonic, Infrasonic and audible waves travel through a medium with

speeds $V_{U}, V_{i} a n d V_{a}$ respectively, then [CPMT 1989]

Discussion

5176.	STATE the characteristics of the chemical reaction which takes place when : A) dil.hydrochloric acid is added to sodium carbonate B) dil.sulphuric acid is added to barium chloride solution C) wax is Burnes in the form of candle
Answer» STATE the characteristics of the chemical reaction which takes place when : A) dil.hydrochloric acid is added to sodium carbonate B) dil.sulphuric acid is added to barium chloride solution C) wax is Burnes in the form of candle

5176.

STATE the characteristics of the chemical reaction which takes place when : A) dil.hydrochloric acid is added to sodium carbonate B) dil.sulphuric acid is added to barium chloride solution C) wax is Burnes in the form of candle

Answer»

STATE the characteristics of the chemical reaction which takes place when :

A) dil.hydrochloric acid is added to sodium carbonate

B) dil.sulphuric acid is added to barium chloride solution

C) wax is Burnes in the form of candle

Discussion

5177.	42. A compound contains 28% Nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. Find the atomic weight of metal.
Answer» 42. A compound contains 28% Nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. Find the atomic weight of metal.

Discussion

5178.	Draw the structural formula for each of the following:(i) Ethanoic acid(ii) But-2-yne
Answer» Draw the structural formula for each of the following: (i) Ethanoic acid (ii) But-2-yne

Discussion

5179.	What type of crystalline solid is solid carbon dioxide?1) Non polar molecular solid2)polar molecular solid3) ionic solid4) metallic solid
Answer» What type of crystalline solid is solid carbon dioxide? 1) Non polar molecular solid 2)polar molecular solid 3) ionic solid 4) metallic solid

Discussion

5180.	Calculate effective nuclear charge of sodium with ex plantation. Also provide me the rules fully explainEd, .
Answer» Calculate effective nuclear charge of sodium with ex plantation. Also provide me the rules fully explainEd, .

Discussion

5181.	For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap ? (a) Castor oil and calcium hydroxide (b) Turpentine oil and sodium hydroxide (c) Castor oil and sodium hydroxide (d) Mustard oil and calcium hydroxide
Answer» For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap ? (a) Castor oil and calcium hydroxide (b) Turpentine oil and sodium hydroxide (c) Castor oil and sodium hydroxide (d) Mustard oil and calcium hydroxide

Discussion

5182.	Why are sodium and potassium stored in kerosene?
Answer» Why are sodium and potassium stored in kerosene?

Discussion

5183.	31. In a flask colourless N2O4 is in equilibrium with brown coloured NO2 .at equilibrium when the flask is heated at 100C the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy,delta H for formation of NO2 is Negative Positive Zero Undefined
Answer» 31. In a flask colourless N2O4 is in equilibrium with brown coloured NO2 .at equilibrium when the flask is heated at 100C the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy,delta H for formation of NO2 is Negative Positive Zero Undefined

Discussion

5184.	The usage of water is determined after ascertaining the quality of water. What are the indicators that provide us clue to the quality of water ? Now explain what is turbidity? [3 MARKS]
Answer» The usage of water is determined after ascertaining the quality of water. What are the indicators that provide us clue to the quality of water ? Now explain what is turbidity? [3 MARKS]

Discussion

5185.	Q42. With reference to the “World food India 2017”, consider the following statements 1. It was organized by the Ministry of Corporate Affairs. 2. The event aimed at making the food processing industry attractive for investment. Which of the above statement(s) is/are correct?
Answer» Q42. With reference to the “World food India 2017”, consider the following statements 1. It was organized by the Ministry of Corporate Affairs. 2. The event aimed at making the food processing industry attractive for investment. Which of the above statement(s) is/are correct?

5185.

Q42. With reference to the “World food India 2017”, consider the following statements 1. It was organized by the Ministry of Corporate Affairs. 2. The event aimed at making the food processing industry attractive for investment. Which of the above statement(s) is/are correct?

Answer»

Q42. With reference to the “World food India 2017”, consider the following statements

1. It was organized by the Ministry of Corporate Affairs.

2. The event aimed at making the food processing industry attractive for investment.

Which of the above statement(s) is/are correct?

Discussion

5186.	Calculate the volume of 1 M HCI required to react asolution containing 0.5 mole of KOH and 1 mole ofNa2CO3 in presence of phenolphthalein indicator .(1) 2 L(3) 1.5 L(2) 1 L-rv, (4) 0.5L4"14も
Answer» Calculate the volume of 1 M HCI required to react asolution containing 0.5 mole of KOH and 1 mole ofNa2CO3 in presence of phenolphthalein indicator .(1) 2 L(3) 1.5 L(2) 1 L-rv, (4) 0.5L4"14も

Discussion

5187.	What would be the electron - dot structure fo carbon dioxide which ha sthe formula CO2?
Answer» What would be the electron - dot structure fo carbon dioxide which ha sthe formula $C O_{2}$ ?

Discussion

5188.	On analysis it was found that the black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively. Show that this data is in accordance with law of multiple proportions.
Answer» On analysis it was found that the black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively. Show that this data is in accordance with law of multiple proportions.

Discussion

5189.	Choose the correct option and rewrite the statement.a. The number of electrons in the outermost shell of alkali metals is .....(i) 1 (ii) 2 (iii) 3 (iv) 7b. Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ....(i) Group 2 (ii) Group 16(iii) Period 2 (iv) d-blockc. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Which of the following elements be present in the same group as X.(i) Na (ii) Mg (iii) Al (iv) Sid. In which block of the modern periodic table are the nonmetals found?(i) s-block (ii) p-block(iii) d-block (iv) f-block
Answer» Choose the correct option and rewrite the statement. a. The number of electrons in the outermost shell of alkali metals is ..... (i) 1 (ii) 2 (iii) 3 (iv) 7 b. Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in .... (i) Group 2 (ii) Group 16 (iii) Period 2 (iv) d-block c. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Which of the following elements be present in the same group as X. (i) Na (ii) Mg (iii) Al (iv) Si d. In which block of the modern periodic table are the nonmetals found? (i) s-block (ii) p-block (iii) d-block (iv) f-block

Discussion

5190.	Given: E0Ag+/Ag=0.80 V,E0Mg2+/Mg=−2.37 V,E0Cu2+/Cu=0.34 V,E0Hg2+/Hg=0.79 VWhich of the following statements is/are correct ?
Answer» Given: $E_{A g^{+} / A g}^{0} = 0.80 V$ , $E_{M g^{2 +} / M g}^{0} = - 2.37 V$ , $E_{C u^{2 +} / C u}^{0} = 0.34 V$ , $E_{H g^{2 +} / H g}^{0} = 0.79 V$ Which of the following statements is/are correct ?

Discussion

5191.	Which of the following compounds will undergo an addition reaction?
Answer» Which of the following compounds will undergo an addition reaction?

Discussion

5192.	Some organic compounds are given. Identify alcohol from the following.
Answer» Some organic compounds are given. Identify alcohol from the following.

Discussion

5193.	How many carbon atoms are present in 0.35 mol of C6H12O6 :
Answer» How many carbon atoms are present in 0.35 mol of $C_{6} H_{12} O_{6}$ :

Discussion

5194.	The mole of gases NH3, CO2 and H2 adsorbed by 1 g charcoal at 300 K and 1 atm pressure shows the order:
Answer» The mole of gases $N H_{3}, C O_{2} and H_{2}$ adsorbed by $1 g$ charcoal at $300 K$ and $1 atm$ pressure shows the order:

Discussion

5195.	The valency of nitrogen in N2 molecule is _____.
Answer» The valency of nitrogen in $N_{2}$ molecule is _____.

Discussion

5196.	I need to know how to balance the equations in a simple way .
Answer» I need to know how to balance the equations in a simple way .

Discussion

5197.	If noble gases are neither electropositive nor electronegative in nature, why they are considered as non metals?
Answer» If noble gases are neither electropositive nor electronegative in nature, why they are considered as non metals?

Discussion

5198.	Which of these reactions release a gas that burns with a pop sound?
Answer» Which of these reactions release a gas that burns with a pop sound?

Discussion

5199.	Which of the following act as a reducing agent in the reduction zone of blast furnace during the extraction of iron from hematite?
Answer» Which of the following act as a reducing agent in the reduction zone of blast furnace during the extraction of iron from hematite?

Discussion

5200.	5. Number of pi-bonds produced by complete combustion of 7.8g of benzene in air will be
Answer» 5. Number of pi-bonds produced by complete combustion of 7.8g of benzene in air will be

Discussion

Explore topic-wise InterviewSolutions in .

A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:

Name a metal which occurs free in nature.

How rancidity can be retarded by storing foods away from light?

The chemical formula of vinegar is.

A solution of common salt when added to silver nitrate solution yields a precipitate of silver chloride(0.28 g). Find the mass of sodium chloride in the solution.

Among the following set of quantum numbers, the impossible set is:

State your observations for the following electrolytic reactions:(a) Solid copper sulphate is electrolysed between platinum electrodes.(b) Aqueous copper sulphate is electrolysed between platinum electrodes.(c) Aqueous copper sulphate is electrolysed between copper electrodes.

Aluminium chloride exists as a dimer (Al2Cl6) in solid state as well as in solution of non-polar solvents such as C6H6. When dissolved in water it gives:

36. 2.2 g of CO2 and 2.24L of H2 at STP are mixed in a container. The total number of moles in the mixture will be

what is the pH of 0.5M aqueous solution of NaCN?given pkb of CN^-=4.7

51. The equivalent conductances of sodium acetate, sodium chloride and hydrochloric acid are 83,127 and 426 ohm cm2/eq at 250^° c respectively.calculate the equivalent conductance of acetic acid solution.

How is this possible that ionic compounds in the solid state do not conduct electricity and they do so in the molten state?

Mentor, I have a doubt in the topic properties of ethanol.

Bases change the colour of methyl orange:

Find the number of possible isomers for C7H8O retaining the phenyl ring in all its isomers.

The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.

A gas 'P' gives dense white fumes with chlorine. Its aqueous solution gives a blue colour with copper (II) hydroxide. (a) Name the gas P. (b) Give its formula. (c) Give three uses of P.

77.How many electrons in a atom with atomic number 105 can have (n+l) =8 How many electrons in a atom with atomic number 105 can have (n+l) =8

What happens when a base reacts with a metal?

Question 1Which of the statements about the reaction below are incorrect?2PbO(s)+C(s)→2Pb (s)+CO2(g)(a) Lead is getting reduced.(b) Carbon dioxide is getting oxidized.(c) Carbon is getting oxidized.(d) Lead oxide is getting reduced.

Explain, why ammonia is evolved when water is added to the product formed, when magnesium is burnt in air.

How many gm of solid NaOH must be added to 100 ml of a buffer solution which is 0.1M each w.r.t. Acand salt Na A to make the pH of solution 5.5. Given pk, (HA) = 5. (Use antilog (0.5) = 3.16)1(4) None of these(1) 2.08 x 10(3) 2.01 x 10-2(2) 3.05 x 1O3

Ultrasonic, Infrasonic and audible waves travel through a medium with speeds VU,Vi and Va respectively, then [CPMT 1989]

STATE the characteristics of the chemical reaction which takes place when : A) dil.hydrochloric acid is added to sodium carbonate B) dil.sulphuric acid is added to barium chloride solution C) wax is Burnes in the form of candle

42. A compound contains 28% Nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. Find the atomic weight of metal.

Draw the structural formula for each of the following:(i) Ethanoic acid(ii) But-2-yne

What type of crystalline solid is solid carbon dioxide?1) Non polar molecular solid2)polar molecular solid3) ionic solid4) metallic solid

Calculate effective nuclear charge of sodium with ex plantation. Also provide me the rules fully explainEd, .

Why are sodium and potassium stored in kerosene?

31. In a flask colourless N2O4 is in equilibrium with brown coloured NO2 .at equilibrium when the flask is heated at 100C the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy,delta H for formation of NO2 is Negative Positive Zero Undefined

The usage of water is determined after ascertaining the quality of water. What are the indicators that provide us clue to the quality of water ? Now explain what is turbidity? [3 MARKS]

Q42. With reference to the “World food India 2017”, consider the following statements 1. It was organized by the Ministry of Corporate Affairs. 2. The event aimed at making the food processing industry attractive for investment. Which of the above statement(s) is/are correct?

Calculate the volume of 1 M HCI required to react asolution containing 0.5 mole of KOH and 1 mole ofNa2CO3 in presence of phenolphthalein indicator .(1) 2 L(3) 1.5 L(2) 1 L-rv, (4) 0.5L4"14も

What would be the electron - dot structure fo carbon dioxide which ha sthe formula CO2?

On analysis it was found that the black oxide of copper and red oxide of copper contain 80% and 89% of copper respectively. Show that this data is in accordance with law of multiple proportions.

Given: E0Ag+/Ag=0.80 V,E0Mg2+/Mg=−2.37 V,E0Cu2+/Cu=0.34 V,E0Hg2+/Hg=0.79 VWhich of the following statements is/are correct ?

Which of the following compounds will undergo an addition reaction?

Some organic compounds are given. Identify alcohol from the following.

How many carbon atoms are present in 0.35 mol of C6H12O6 :

The mole of gases NH3, CO2 and H2 adsorbed by 1 g charcoal at 300 K and 1 atm pressure shows the order:

The valency of nitrogen in N2 molecule is _____.

I need to know how to balance the equations in a simple way .

If noble gases are neither electropositive nor electronegative in nature, why they are considered as non metals?

Which of these reactions release a gas that burns with a pop sound?

Which of the following act as a reducing agent in the reduction zone of blast furnace during the extraction of iron from hematite?

5. Number of pi-bonds produced by complete combustion of 7.8g of benzene in air will be