15280 + Interview Questions in Chemistry Page 40 InterviewSolution

1951.	Out of the following elements, choose the elements which are capable of forming amphoteric oxides.
Answer» Out of the following elements, choose the elements which are capable of forming amphoteric oxides.

Discussion

1952.	How can we identify that a particular compound is a salt?
Answer» How can we identify that a particular compound is a salt?

Discussion

1953.	Which of the following oxides is basic in nature?
Answer» Which of the following oxides is basic in nature?

Discussion

1954.	Select the option that will complete the homologous series given below. C2H4, C3H6, _______, C5H10, C6H12
Answer» Select the option that will complete the homologous series given below. $C_{2} H_{4}$ , $C_{3} H_{6}$ , _______, $C_{5} H_{10}$ , $C_{6} H_{12}$

Discussion

1955.	What are the conditions necessary for the formation of covalent molecule? Give their properties.
Answer» What are the conditions necessary for the formation of covalent molecule? Give their properties.

Discussion

1956.	Identify Y in the following reaction.C2H5NH2HCl−−−−→NaNO2[X]H2O−−→Y
Answer» Identify Y in the following reaction. $C_{2} H_{5} N H_{2} H C l - --- \to N a N O_{2} [X] H_{2} O - - \to Y$

Discussion

1957.	Why cyclopropanyl carbocation is more stable than benzyl carbocation but less stable than tropylium carbocation? It is true that the more will be the resonating structure of carbocation ,more will be the stability of the carbocation, then why benzyl carbocation with 5 resonating structure is less stable than cyclopropanyl carbocation having 3 resonating structure. explain this.
Answer» Why cyclopropanyl carbocation is more stable than benzyl carbocation but less stable than tropylium carbocation? It is true that the more will be the resonating structure of carbocation ,more will be the stability of the carbocation, then why benzyl carbocation with 5 resonating structure is less stable than cyclopropanyl carbocation having 3 resonating structure. explain this.

Discussion

1958.	Is there any way to measure ionisation potential of an atom
Answer» Is there any way to measure ionisation potential of an atom

Discussion

1959.	Which 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» 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

1960.	nttwo short dipoles with their moments p1 and p2 are placed parallel to each other. Find potential energy of second dipole in the field of first onen
Answer» nttwo short dipoles with their moments p1 and p2 are placed parallel to each other. Find potential energy of second dipole in the field of first onen

Discussion

1961.	Name with examples three common forms in which metals occur in nature? How do metals interact with dilute acids? [5 MARKS]
Answer» Name with examples three common forms in which metals occur in nature? How do metals interact with dilute acids? [5 MARKS]

Discussion

1962.	Which of the following pairs have nearly same mass? 1. electron and β particle 2. neutron and β particle 3. proton and 21H+ ion 4. α - particle and He2+ ion 5. proton and 11H+ ion
Answer» Which of the following pairs have nearly same mass? 1. electron and $β$ particle 2. neutron and $β$ particle 3. proton and $_{1}^{2} H^{+}$ ion 4. $α$ - particle and $H e^{2 +}$ ion 5. proton and $_{1}^{1} H^{+}$ ion

Discussion

1963.	Write down the factors which affect the rate of reaction.
Answer» Write down the factors which affect the rate of reaction.

Discussion

1964.	The root word for naming a hydrocarbon with 3 carbons is?
Answer» The root word for naming a hydrocarbon with 3 carbons is?

Discussion

1965.	Aluminium is a powerful _____.
Answer» Aluminium is a powerful _____.

Discussion

1966.	Draw the diagram of nitrogen cycle.
Answer» Draw the diagram of nitrogen cycle.

Discussion

1967.	The time taken for a first order reaction to reduce to initial concentration by a factor of 1/4 is 10 min . If concentration is reduced to 1/6 then the time required is
Answer» The time taken for a first order reaction to reduce to initial concentration by a factor of 1/4 is 10 min . If concentration is reduced to 1/6 then the time required is

Discussion

1968.	When ammonium hydroxide reacts with nitric acid, the products formed are:
Answer» When ammonium hydroxide reacts with nitric acid, the products formed are:

Discussion

1969.	What is ozone? How is ozone formed? How does ozone layer product us from the harmful effects in the environment? Write the full form of CFC. What harm can they do?
Answer» What is ozone? How is ozone formed? How does ozone layer product us from the harmful effects in the environment? Write the full form of CFC. What harm can they do?

Discussion

1970.	The position of the three elements A, B and C in the periodic table indicated below: Group16 Group17 --- ------ (first period) -------- A (second period) ----- ------ (third period) B C (fourth period) 1. state whether metal C is metal or non-metal. Why? 2. Which is more active element, A or C? Why? 3. which type of ion (cation or anion) will formed by the element C? Why?
Answer» The position of the three elements A, B and C in the periodic table indicated below: Group16 Group17 --- ------ (first period) -------- A (second period) ----- ------ (third period) B C (fourth period) 1. state whether metal C is metal or non-metal. Why? 2. Which is more active element, A or C? Why? 3. which type of ion (cation or anion) will formed by the element C? Why?

Discussion

1971.	In an α -decay the kinetic energy of α particleis 48 MeV and Q-value of the reaction is 50 MeVThe mass number of the mother nucleus is:(Assume that daughter nucleus is in ground state)
Answer» In an α -decay the kinetic energy of α particleis 48 MeV and Q-value of the reaction is 50 MeVThe mass number of the mother nucleus is:(Assume that daughter nucleus is in ground state)

Discussion

1972.	Why did Mendeleev leave some gaps in his periodic table of elements ? Explain your answer with an example.
Answer» Why did Mendeleev leave some gaps in his periodic table of elements ? Explain your answer with an example.

Discussion

1973.	What is meant by carbonic acid
Answer» What is meant by carbonic acid

Discussion

1974.	(a) What is corrosion? (b) Name any two metals which do not corrode easily, (c) What is the corrosion of iron known as? (d) Explain why aluminium is a highly reactive metal, still, it is used to make utensils for cooking.
Answer» (a) What is corrosion? (b) Name any two metals which do not corrode easily, (c) What is the corrosion of iron known as? (d) Explain why aluminium is a highly reactive metal, still, it is used to make utensils for cooking.

Discussion

1975.	gastric juice contains
Answer» gastric juice contains

Discussion

1976.	How is ammonia collected?
Answer» How is ammonia collected?

Discussion

1977.	Who showed for the first time that there is periodicity in properties of elements? Why is there periodicity in the periodic table? Explain. [3 MARKS]
Answer» Who showed for the first time that there is periodicity in properties of elements? Why is there periodicity in the periodic table? Explain. [3 MARKS]

Discussion

1978.	What is meant by empirical formula
Answer» What is meant by empirical formula

Discussion

1979.	9 MnO ions are reduced in acidic condition toMn2 ions whereas they are reduced in neutracondition to MnO2 The oxidation of 25 mL of asolution X containing Fe ions required in acidiccondition 20 mL of a solution Y containing Mn0ions. What volume of solution Y would be requiredto oxidise 25 mL of solution X containing Fe+ ionsin neutral condition?(a) 11.4 mL(cY 33.3 mL(b) 12.0 mL(d) 35.0 mL
Answer» 9 MnO ions are reduced in acidic condition toMn2 ions whereas they are reduced in neutracondition to MnO2 The oxidation of 25 mL of asolution X containing Fe ions required in acidiccondition 20 mL of a solution Y containing Mn0ions. What volume of solution Y would be requiredto oxidise 25 mL of solution X containing Fe+ ionsin neutral condition?(a) 11.4 mL(cY 33.3 mL(b) 12.0 mL(d) 35.0 mL

Discussion

1980.	34. Which of the following methods is suitable for the preparation of 1,3, 5-tribromobenzene from benzene? A. (i) AlBr3/Br2, light (ii) separation of isomers. B. (i) HNO3/H2SO4 (ii) Sn/HCl (iii) Br2 (iv) NaNO2/HCl (v) C2H5OH,Δ . C. (i) HNO3/H2SO4 (ii) NaBH4 (iii) Br2/CH3COOH (iv) NaNO2/HCl (v) H3PO2. D. (i) HNO3/H2SO4 (ii) H2/Pd (iii) NaNO2/HCl (iv) CuBr/HBr.
Answer» 34. Which of the following methods is suitable for the preparation of 1,3, 5-tribromobenzene from benzene? A. (i) AlBr3/Br2, light (ii) separation of isomers. B. (i) HNO3/H2SO4 (ii) Sn/HCl (iii) Br2 (iv) NaNO2/HCl (v) C2H5OH,Δ . C. (i) HNO3/H2SO4 (ii) NaBH4 (iii) Br2/CH3COOH (iv) NaNO2/HCl (v) H3PO2. D. (i) HNO3/H2SO4 (ii) H2/Pd (iii) NaNO2/HCl (iv) CuBr/HBr.

Discussion

1981.	R-C6H5+alkaline KMnO4 gives
Answer» R-C6H5+alkaline KMnO4 gives

Discussion

1982.	23 BP order of onitro phenol pnitro phenol m intro phenol and phenol
Answer» 23 BP order of onitro phenol pnitro phenol m intro phenol and phenol

Discussion

1983.	The pH of blood is 7.4. If the buffer in bloods is CO2 and HCO−3, calculate the ratio of conjugate base to acid (H2CO3) to maintain the pH of the blood. Given K1 of H2CO3=4.5×10−7
Answer» The pH of blood is 7.4. If the buffer in bloods is $C O_{2} a n d H C O_{3}^{-}$ , calculate the ratio of conjugate base to acid $(H_{2} C O_{3})$ to maintain the pH of the blood. Given $K_{1}$ of $H_{2} C O_{3} = 4.5 \times 10^{- 7}$

Discussion

1984.	Which of the following statements are true?
Answer» Which of the following statements are true?

Discussion

1985.	A nucleus X has a mass number 12 and atomic number 6. Calculate the number of neutrons and protons, when the nucleus X loses : (a) One proton (b) One neutron. Write the changes in symbolic form. [4 MARKS]
Answer» A nucleus X has a mass number 12 and atomic number 6. Calculate the number of neutrons and protons, when the nucleus X loses : (a) One proton (b) One neutron. Write the changes in symbolic form. [4 MARKS]

Discussion

1986.	What is the mass of nitrogen in 1000 kg of urea [CO(NH2)2]?(H = 1; C = 12; N = 14; O = 16)
Answer» What is the mass of nitrogen in 1000 kg of urea [CO(NH₂)₂]? (H = 1; C = 12; N = 14; O = 16)

Discussion

1987.	Write the reactions involved at cathode and anode in the electrolysis of NaCl.
Answer» Write the reactions involved at cathode and anode in the electrolysis of NaCl.

Discussion

1988.	Consider titration of NaOH solution versus 1.25 M oxalic acid solution. At the end point following burette readings were obtained.(i) 4.5 mL (ii) 4.5 mL (iii) 4.4 mL (iv) 4.4 mL (v) 4.4 mL If the volume of oxalic acid taken was 10.0 mL. Then the molarity of the NaOH solution is M. (Rounded-off to the nearest integer)
Answer» Consider titration of $N a O H$ solution versus 1.25 $M$ oxalic acid solution. At the end point following burette readings were obtained. $(i) 4.5 mL (i i) 4.5 mL (i i i) 4.4 mL (i v) 4.4 mL (v) 4.4 mL$ If the volume of oxalic acid taken was $10.0 mL$ . Then the molarity of the $N a O H$ solution is $M$ . (Rounded-off to the nearest integer)

Discussion

1989.	Which of the following will not get octet number of electrons when they form compounds . Sc Ti V Zn
Answer» Which of the following will not get octet number of electrons when they form compounds . Sc Ti V Zn

Discussion

1990.	9.The ionisation constant of H2CO3 as an acid in aqueous solution at room temperature is x . if the first and second ionisation constants of H2CO3 are x1 and x2 then a] x=x1/x2 b ] x= x2/x1 c ] x=x1.x2 d ] x=x1.x2/2
Answer» 9.The ionisation constant of H2CO3 as an acid in aqueous solution at room temperature is x . if the first and second ionisation constants of H2CO3 are x1 and x2 then a] x=x1/x2 b ] x= x2/x1 c ] x=x1.x2 d ] x=x1.x2/2

Discussion

1991.	PtCl4.6H2O can exist as a hydrated complex. one molal aqeous solution of the salt recorded a depression in freezing point of 3.72 degree celsius if the salt is assumed to be 100 percent ionized in solution and kf for H2O is 1.86 k kg /mol the molecular formula of the complex is likely to be
Answer» PtCl4.6H2O can exist as a hydrated complex. one molal aqeous solution of the salt recorded a depression in freezing point of 3.72 degree celsius if the salt is assumed to be 100 percent ionized in solution and kf for H2O is 1.86 k kg /mol the molecular formula of the complex is likely to be

Discussion

1992.	define work function
Answer» define work function

Discussion

1993.	Question 9Write a short note on different types of Deodorant?
Answer» Question 9 Write a short note on different types of Deodorant?

Discussion

1994.	The acid which shows salt-like character in aqueous solution is(1) Acetic acid(2) α-aminoethanoic acid(3) Benzoic acid(4) Formic aci
Answer» The acid which shows salt-like character in aqueous solution is(1) Acetic acid(2) α-aminoethanoic acid(3) Benzoic acid(4) Formic aci

Discussion

1995.	The compound C7H8 undergoes the following reactions C7H8\overset{}{\xrightarrow{3cl2/heat}a\xrightarrow{Br2/Fe}}b\xrightarrow{Zn/Hcl}c the product c is
Answer» The compound C7H8 undergoes the following reactions C7H8\overset{}{\xrightarrow{3cl2/heat}a\xrightarrow{Br2/Fe}}b\xrightarrow{Zn/Hcl}c the product c is

Discussion

1996.	What happens when calcium metal is treated with water?
Answer» What happens when calcium metal is treated with water?

Discussion

1997.	Write balanced equations for: (a)a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions. (b)a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
Answer» Write balanced equations for: (a)a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions. (b)a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

Discussion

1998.	21 For the melting of NaCl heat required is 7.26 kcal mol1 andSincreases by 6.73 cal mol1k1. The melting point of the salt is (1) 805.75C (2) 500 K (3) 1.77 K (4) 1.77C
Answer» 21 For the melting of NaCl heat required is 7.26 kcal mol1 andSincreases by 6.73 cal mol1k1. The melting point of the salt is (1) 805.75C (2) 500 K (3) 1.77 K (4) 1.77C

Discussion

1999.	Arrange n-pentane, isopentane, and neopentane in the decreasing order of their boiling points and justify. [5 MARKS]
Answer» Arrange n-pentane, isopentane, and neopentane in the decreasing order of their boiling points and justify. [5 MARKS]

Discussion

2000.	In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is
Answer» In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with $N a O H$ is

Discussion

Explore topic-wise InterviewSolutions in .

Out of the following elements, choose the elements which are capable of forming amphoteric oxides.

How can we identify that a particular compound is a salt?

Which of the following oxides is basic in nature?

Select the option that will complete the homologous series given below. C2H4, C3H6, _______, C5H10, C6H12

What are the conditions necessary for the formation of covalent molecule? Give their properties.

Identify Y in the following reaction.C2H5NH2HCl−−−−→NaNO2[X]H2O−−→Y

Is there any way to measure ionisation potential of an atom

Which 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.

nttwo short dipoles with their moments p1 and p2 are placed parallel to each other. Find potential energy of second dipole in the field of first onen

Name with examples three common forms in which metals occur in nature? How do metals interact with dilute acids? [5 MARKS]

Which of the following pairs have nearly same mass? 1. electron and β particle 2. neutron and β particle 3. proton and 21H+ ion 4. α - particle and He2+ ion 5. proton and 11H+ ion

Write down the factors which affect the rate of reaction.

The root word for naming a hydrocarbon with 3 carbons is?

Aluminium is a powerful _____.

Draw the diagram of nitrogen cycle.

The time taken for a first order reaction to reduce to initial concentration by a factor of 1/4 is 10 min . If concentration is reduced to 1/6 then the time required is

When ammonium hydroxide reacts with nitric acid, the products formed are:

What is ozone? How is ozone formed? How does ozone layer product us from the harmful effects in the environment? Write the full form of CFC. What harm can they do?

In an α -decay the kinetic energy of α particleis 48 MeV and Q-value of the reaction is 50 MeVThe mass number of the mother nucleus is:(Assume that daughter nucleus is in ground state)

Why did Mendeleev leave some gaps in his periodic table of elements ? Explain your answer with an example.

What is meant by carbonic acid

(a) What is corrosion? (b) Name any two metals which do not corrode easily, (c) What is the corrosion of iron known as? (d) Explain why aluminium is a highly reactive metal, still, it is used to make utensils for cooking.

gastric juice contains

How is ammonia collected?

Who showed for the first time that there is periodicity in properties of elements? Why is there periodicity in the periodic table? Explain. [3 MARKS]

What is meant by empirical formula

R-C6H5+alkaline KMnO4 gives

23 BP order of onitro phenol pnitro phenol m intro phenol and phenol

The pH of blood is 7.4. If the buffer in bloods is CO2 and HCO−3, calculate the ratio of conjugate base to acid (H2CO3) to maintain the pH of the blood. Given K1 of H2CO3=4.5×10−7

Which of the following statements are true?

A nucleus X has a mass number 12 and atomic number 6. Calculate the number of neutrons and protons, when the nucleus X loses : (a) One proton (b) One neutron. Write the changes in symbolic form. [4 MARKS]

What is the mass of nitrogen in 1000 kg of urea [CO(NH2)2]?(H = 1; C = 12; N = 14; O = 16)

Write the reactions involved at cathode and anode in the electrolysis of NaCl.

Which of the following will not get octet number of electrons when they form compounds . Sc Ti V Zn

9.The ionisation constant of H2CO3 as an acid in aqueous solution at room temperature is x . if the first and second ionisation constants of H2CO3 are x1 and x2 then a] x=x1/x2 b ] x= x2/x1 c ] x=x1.x2 d ] x=x1.x2/2

PtCl4.6H2O can exist as a hydrated complex. one molal aqeous solution of the salt recorded a depression in freezing point of 3.72 degree celsius if the salt is assumed to be 100 percent ionized in solution and kf for H2O is 1.86 k kg /mol the molecular formula of the complex is likely to be

define work function

Question 9Write a short note on different types of Deodorant?

The acid which shows salt-like character in aqueous solution is(1) Acetic acid(2) α-aminoethanoic acid(3) Benzoic acid(4) Formic aci

The compound C7H8 undergoes the following reactions C7H8\overset{}{\xrightarrow{3cl2/heat}a\xrightarrow{Br2/Fe}}b\xrightarrow{Zn/Hcl}c the product c is

What happens when calcium metal is treated with water?

Write balanced equations for: (a)a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions. (b)a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

21 For the melting of NaCl heat required is 7.26 kcal mol1 andSincreases by 6.73 cal mol1k1. The melting point of the salt is (1) 805.75C (2) 500 K (3) 1.77 K (4) 1.77C

Arrange n-pentane, isopentane, and neopentane in the decreasing order of their boiling points and justify. [5 MARKS]

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is