15280 + Interview Questions in Chemistry Page 14 InterviewSolution

651.	44. The most stable carbocation amongst the following is(2) CH2 CH-CH2(3) CH3-CH2-CH2(4) CH2-C CH
Answer» 44. The most stable carbocation amongst the following is(2) CH2 CH-CH2(3) CH3-CH2-CH2(4) CH2-C CH

Discussion

652.	Energy received on earth from the sun is 2cal percm^3per min .if the average wavelength of solarlight is 5500A then how many photon are received on earth per cm^3per min
Answer» Energy received on earth from the sun is 2cal percm^3per min .if the average wavelength of solarlight is 5500A then how many photon are received on earth per cm^3per min

Discussion

653.	Give the IUPAC name of the following compound : C2H6
Answer» Give the IUPAC name of the following compound : $C_{2} H_{6}$

Discussion

654.	Name the gas evolved when the mixture of calcium hydroxide and ammonium chloride is heated.
Answer» Name the gas evolved when the mixture of calcium hydroxide and ammonium chloride is heated.

Discussion

655.	What happens when sodium hydroxide is heated with ammonium salts?
Answer» What happens when sodium hydroxide is heated with ammonium salts?

Discussion

656.	Electrolysis involves oxidation and reduction respectively at:
Answer» Electrolysis involves oxidation and reduction respectively at:

Discussion

657.	When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue. (a) what do you think is metal X ? (b) What could be gas Y2 ? (c) What is compound XO ? (d) What is compound Y2O (e) Write the chemical equation of the reaction which takes place on heating XO with Y2. (f) What type of chemical reaction is illustrated in the above equation ?
Answer» When a black metal compound XO is heated with a colourless gas $Y_{2}$ , then metal X and another compound $Y_{2} O$ are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas $Y_{2}$ can be prepared by the action of a dilute acid on any active metal. The compound $Y_{2} O$ is a liquid at room temperature which can turn anhydrous copper sulphate blue. (a) what do you think is metal X ? (b) What could be gas $Y_{2}$ ? (c) What is compound XO ? (d) What is compound $Y_{2} O$ (e) Write the chemical equation of the reaction which takes place on heating XO with $Y_{2}$ . (f) What type of chemical reaction is illustrated in the above equation ?

657.

When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue. (a) what do you think is metal X ? (b) What could be gas Y2 ? (c) What is compound XO ? (d) What is compound Y2O (e) Write the chemical equation of the reaction which takes place on heating XO with Y2. (f) What type of chemical reaction is illustrated in the above equation ?

Answer»

When a black metal compound XO is heated with a colourless gas $Y_{2}$ , then metal X and another compound $Y_{2} O$ are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas $Y_{2}$ can be prepared by the action of a dilute acid on any active metal. The compound $Y_{2} O$ is a liquid at room temperature which can turn anhydrous copper sulphate blue.

(a) what do you think is metal X ?

(b) What could be gas $Y_{2}$ ?

(c) What is compound XO ?

(d) What is compound $Y_{2} O$

(e) Write the chemical equation of the reaction which takes place on heating XO with $Y_{2}$ .

(f) What type of chemical reaction is illustrated in the above equation ?

Discussion

658.	19. OCl-/Cl- and Cl-/1/2Cl2 ke standard potential is 0.94V and1.36V what is the E^° value of OCl-/1/2Cl2 1)2.20V 2)0.42V 3)0.52V 4)0.490V
Answer» 19. OCl-/Cl- and Cl-/1/2Cl2 ke standard potential is 0.94V and1.36V what is the E^° value of OCl-/1/2Cl2 1)2.20V 2)0.42V 3)0.52V 4)0.490V

Discussion

659.	In which of the following molecule are all atoms coplanar?
Answer» In which of the following molecule are all atoms coplanar?

Discussion

660.	Wt do u mean by soft iron
Answer» Wt do u mean by soft iron

Discussion

661.	Explain Beckmann rearrangement in full details
Answer» Explain Beckmann rearrangement in full details

Discussion

662.	A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?
Answer» A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?

Discussion

663.	22. A gas has molecular formula (CH)n.If vapour density of the gas is 39,what should be the formula of the compound? (A)C3H3 (B)C4H4 (C)C2H2 (D)C6H6
Answer» 22. A gas has molecular formula (CH)n.If vapour density of the gas is 39,what should be the formula of the compound? (A)C3H3 (B)C4H4 (C)C2H2 (D)C6H6

Discussion

664.	We say that due to repulsive force present in real gases,volume occupied by the molecule is more than ideal gas that is,correction factor is given by (V-nb)but if we consider attractive force b/w the molecules it should actually pull the molecules and decrease its volume right but we dont consider attractive forces at all, why??
Answer» We say that due to repulsive force present in real gases,volume occupied by the molecule is more than ideal gas that is,correction factor is given by (V-nb)but if we consider attractive force b/w the molecules it should actually pull the molecules and decrease its volume right but we dont consider attractive forces at all, why??

Discussion

665.	Correct the spelling.1. oktober2. julliet3. maie4. aôute5. fevrir
Answer» Correct the spelling. 1. oktober 2. julliet 3. maie 4. aôute 5. fevrir

Discussion

666.	An element X forms an oxide X2O3 In which group of Mendeleev’s periodic table is this element placed? (a) group II (b) group III (c) group V (d) group VIII
Answer» An element X forms an oxide $X_{2} O_{3}$ In which group of Mendeleev’s periodic table is this element placed? (a) group II (b) group III (c) group V (d) group VIII

666.

An element X forms an oxide X2O3 In which group of Mendeleev’s periodic table is this element placed? (a) group II (b) group III (c) group V (d) group VIII

Answer»

An element X forms an oxide $X_{2} O_{3}$ In which group of Mendeleev’s periodic table is this element placed?

(a) group II (b) group III (c) group V (d) group VIII

Discussion

667.	Give reason: What are noble gases? Give two examples of noble gases.
Answer» Give reason: What are noble gases? Give two examples of noble gases.

Discussion

668.	Write major uses of carbon and it's compounds
Answer» Write major uses of carbon and it's compounds

Discussion

669.	Why can't two carbons form 4 bonds?
Answer» Why can't two carbons form 4 bonds?

Discussion

670.	What type of structure does lithium have?
Answer» What type of structure does lithium have?

Discussion

671.	If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain ? Plants→Goat→Lion
Answer» If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain ? $P l a n t s \to G o a t \to L i o n$

671.

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain ? Plants→Goat→Lion

Answer»

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain ?

$P l a n t s \to G o a t \to L i o n$

Discussion

672.	Give the balanced chemical reaction of sodium with ethanol.
Answer» Give the balanced chemical reaction of sodium with ethanol.

Discussion

673.	Derive the formula of relative error from x = a/b
Answer» Derive the formula of relative error from x = a/b

Discussion

674.	Write equations for each of the above metal which reacts with water.
Answer» Write equations for each of the above metal which reacts with water.

Discussion

675.	What do you understand by 'chemical reaction' ?
Answer» What do you understand by 'chemical reaction' ?

Discussion

676.	Which of the following is a polar molecule? } (1) Para dichlorobenzene } (2) Carbon tetrachloride } (3) Tetrachloroethene } (4) }HO-benzeneOH
Answer» Which of the following is a polar molecule? } (1) Para dichlorobenzene } (2) Carbon tetrachloride } (3) Tetrachloroethene } (4) }HO-benzeneOH

Discussion

677.	14.The number of ions produced by potassium hexacyanoferrate (2) is
Answer» 14.The number of ions produced by potassium hexacyanoferrate (2) is

Discussion

678.	A. Phenyl methanamineB. N, N - DimethylanilineC. N - Methyl anilineD. BenzenamineChoose the correct order of basic nature of the above amines.
Answer» A. Phenyl methanamine B. N, N - Dimethylaniline C. N - Methyl aniline D. Benzenamine Choose the correct order of basic nature of the above amines.

Discussion

679.	Question 5(b)Write word equations and then balanced equations for the reaction taking place when:(b) Dilute hydrochloric acid reacts with magnesium ribbon
Answer» Question 5(b) Write word equations and then balanced equations for the reaction taking place when: (b) Dilute hydrochloric acid reacts with magnesium ribbon

Discussion

680.	does electron affinity increase or decrease down the group ?
Answer» does electron affinity increase or decrease down the group ?

Discussion

681.	What happens when water is added to quick lime?
Answer» What happens when water is added to quick lime?

Discussion

682.	Write the balanced chemical equation for the following and identify the type of reaction in each case – (A)Potassium bromide(aq)+Barium iodide(aq)→Potassium iodide(aq)+Barium bromide(s) (B)Zinc carbonate(s)→Zinc oxide(s)+Carbon dioxide(g)
Answer» Write the balanced chemical equation for the following and identify the type of reaction in each case – $(A) P o t a s s i u m b r o m i d e (a q) + B a r i u m i o d i d e (a q) \to P o t a s s i u m i o d i d e (a q) + B a r i u m b r o m i d e (s)$ $(B) Z i n c c a r b o n a t e (s) \to Z i n c o x i d e (s) + C a r b o n d i o x i d e (g)$

682.

Write the balanced chemical equation for the following and identify the type of reaction in each case – (A)Potassium bromide(aq)+Barium iodide(aq)→Potassium iodide(aq)+Barium bromide(s) (B)Zinc carbonate(s)→Zinc oxide(s)+Carbon dioxide(g)

Answer»

Write the balanced chemical equation for the following and identify the type of reaction in each case –
$(A) P o t a s s i u m b r o m i d e (a q) + B a r i u m i o d i d e (a q) \to P o t a s s i u m i o d i d e (a q) + B a r i u m b r o m i d e (s)$

$(B) Z i n c c a r b o n a t e (s) \to Z i n c o x i d e (s) + C a r b o n d i o x i d e (g)$

Discussion

683.	60. Lithium exist in nature in the form of two isotope li-6 and li-7 with atomic masses 6.0151u and 7.0160u and the percentage 8.24 and 91.76 respectively. Calculate average atomic mass.
Answer» 60. Lithium exist in nature in the form of two isotope li-6 and li-7 with atomic masses 6.0151u and 7.0160u and the percentage 8.24 and 91.76 respectively. Calculate average atomic mass.

Discussion

684.	Fill in the following blanks with suitable words : (a) The basis for the modern periodic table is …………… (b) The horizontal rows in a periodic table are called …………… (c) Group 1 elements are called ……………… (d) Group 17 elements are known as …………… (e) Group 18 elements are called …………… (f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.
Answer» Fill in the following blanks with suitable words : (a) The basis for the modern periodic table is …………… (b) The horizontal rows in a periodic table are called …………… (c) Group 1 elements are called ……………… (d) Group 17 elements are known as …………… (e) Group 18 elements are called …………… (f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

684.

Fill in the following blanks with suitable words : (a) The basis for the modern periodic table is …………… (b) The horizontal rows in a periodic table are called …………… (c) Group 1 elements are called ……………… (d) Group 17 elements are known as …………… (e) Group 18 elements are called …………… (f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

Answer»

Fill in the following blanks with suitable words :

(a) The basis for the modern periodic table is ……………

(b) The horizontal rows in a periodic table are called ……………

(c) Group 1 elements are called ………………

(d) Group 17 elements are known as ……………

(e) Group 18 elements are called ……………

(f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

Discussion

685.	450cm3 of nitrogen monoxide and 200cm3 of oxygen are mixed together and ignited. Calculate the composition of the resulting mixture. 2NO+O2→2NO2
Answer» $450 c m^{3}$ of nitrogen monoxide and $200 c m^{3}$ of oxygen are mixed together and ignited. Calculate the composition of the resulting mixture. $2 N O + O_{2} \to 2 N O_{2}$

Discussion

686.	At very low temperature according to the rock salt varies with temperature according to the law C=kT³÷To³, where k=1940J/milk and To=281K .The heat required to raised the temperatures of 2 moles of the rock salt from 10K to 50K
Answer» At very low temperature according to the rock salt varies with temperature according to the law C=kT³÷To³, where k=1940J/milk and To=281K .The heat required to raised the temperatures of 2 moles of the rock salt from 10K to 50K

Discussion

687.	52. 11.6 L of CH_4 and 22.4 L of C_2H_4 at stp are mixed. What is the vapour density of mixture and what is the average molecular wt. of mixture
Answer» 52. 11.6 L of CH_4 and 22.4 L of C_2H_4 at stp are mixed. What is the vapour density of mixture and what is the average molecular wt. of mixture

Discussion

688.	48. Give reason for the higher boiling point of ethanol in comparison to metgoxymethane.
Answer» 48. Give reason for the higher boiling point of ethanol in comparison to metgoxymethane.

Discussion

689.	the volume of 1.0 g of hydrogen at ntp
Answer» the volume of 1.0 g of hydrogen at ntp

Discussion

690.	Aqueous solution of which salts will have a pH value less than 7. a)K2HPO4b)Na2Sc)KH2PO4d)FeCl3
Answer» Aqueous solution of which salts will have a pH value less than 7. $a) K_{2} H P O_{4} b) N a_{2} S c) K H_{2} P O_{4} d) F e C l_{3}$

690.

Aqueous solution of which salts will have a pH value less than 7. a)K2HPO4b)Na2Sc)KH2PO4d)FeCl3

Answer»

Aqueous solution of which salts will have a pH value less than 7.
$a) K_{2} H P O_{4} b) N a_{2} S c) K H_{2} P O_{4} d) F e C l_{3}$

Discussion

691.	How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second:
Answer» How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second:

Discussion

692.

Rearrange the columns 2 and 3 so as to match with the column 1. Column 1 Column 2 Column 3 i. Triad ii. Octave iii. Atomic number iv. Period v. Nucleus vi. Electron a. Lightest and negatively charged particle in all the atoms b. Concentrated mass and positive charge c. Average of the first and the third atomic mass d. Properties of the eighth element similar to the first e. Positive charge on the nucleus f. Sequential change in molecular formulae 1.Mendeleev 2. Thomson 3. Newlands 4. Rutherford 5. Dobereiner 6. Moseley

Answer» Rearrange the columns 2 and 3 so as to match with the column 1.

Column 1	Column 2	Column 3
i. Triad ii. Octave iii. Atomic number iv. Period v. Nucleus vi. Electron	a. Lightest and negatively charged particle in all the atoms b. Concentrated mass and positive charge c. Average of the first and the third atomic mass d. Properties of the eighth element similar to the first e. Positive charge on the nucleus f. Sequential change in molecular formulae	1.Mendeleev 2. Thomson 3. Newlands 4. Rutherford 5. Dobereiner 6. Moseley

Discussion

693.	(a) Give the electron configuration of magnesium and chlorine.(b) Write the electron dot-structures of magnesium and chlorine atoms.(c) Describe the formation of magnesium chloride from magnesium and chlorine by the transfer of electrons.(d) What type of chemical bonds are present in the magnesium chloride formed?(e) Why do such compounds have high melting points?
Answer» (a) Give the electron configuration of magnesium and chlorine. (b) Write the electron dot-structures of magnesium and chlorine atoms. (c) Describe the formation of magnesium chloride from magnesium and chlorine by the transfer of electrons. (d) What type of chemical bonds are present in the magnesium chloride formed? (e) Why do such compounds have high melting points?

Discussion

694.	Give the name and formula of two(a) strong monobasic acids(b) weak dibasic acids(c) non-volatile acids(d) volatile acids
Answer» Give the name and formula of two (a) strong monobasic acids (b) weak dibasic acids (c) non-volatile acids (d) volatile acids

Discussion

695.	Which of the following order is/are correct regarding boiling point?
Answer» Which of the following order is/are correct regarding boiling point?

Discussion

696.	condider a reversible reaction 2A+B-->2C having equilibrium cons†an t 25.if the reaction vessel having 2,0.25and 0.5moles of A,B and C resp. in 100 l vessel then what will be the dirction of reaction forward backward or exist n equilibrium
Answer» condider a reversible reaction 2A+B-->2C having equilibrium cons†an t 25.if the reaction vessel having 2,0.25and 0.5moles of A,B and C resp. in 100 l vessel then what will be the dirction of reaction forward backward or exist n equilibrium

Discussion

697.	The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is : (a) A and B (b) B and D (c) A and C (d) D and E
Answer» The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is : (a) A and B (b) B and D (c) A and C (d) D and E

697.

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is : (a) A and B (b) B and D (c) A and C (d) D and E

Answer»

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is :

(a) A and B (b) B and D (c) A and C (d) D and E

Discussion

698.	Write the three uses of ethyne.
Answer» Write the three uses of ethyne.

Discussion

699.	Question 27What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.
Answer» Question 27 What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.

Discussion

700.	Draw the electron dot structure for [3 MARKS] (a) ethanoic acid (b) ethanol (c) F2
Answer» Draw the electron dot structure for [3 MARKS] (a) ethanoic acid (b) ethanol (c) $F_{2}$

Discussion

Explore topic-wise InterviewSolutions in .

44. The most stable carbocation amongst the following is(2) CH2 CH-CH2(3) CH3-CH2-CH2(4) CH2-C CH

Energy received on earth from the sun is 2cal percm^3per min .if the average wavelength of solarlight is 5500A then how many photon are received on earth per cm^3per min

Give the IUPAC name of the following compound : C2H6

Name the gas evolved when the mixture of calcium hydroxide and ammonium chloride is heated.

What happens when sodium hydroxide is heated with ammonium salts?

Electrolysis involves oxidation and reduction respectively at:

19. OCl-/Cl- and Cl-/1/2Cl2 ke standard potential is 0.94V and1.36V what is the E^° value of OCl-/1/2Cl2 1)2.20V 2)0.42V 3)0.52V 4)0.490V

In which of the following molecule are all atoms coplanar?

Wt do u mean by soft iron

Explain Beckmann rearrangement in full details

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?

22. A gas has molecular formula (CH)n.If vapour density of the gas is 39,what should be the formula of the compound? (A)C3H3 (B)C4H4 (C)C2H2 (D)C6H6

Correct the spelling.1. oktober2. julliet3. maie4. aôute5. fevrir

An element X forms an oxide X2O3 In which group of Mendeleev’s periodic table is this element placed? (a) group II (b) group III (c) group V (d) group VIII

Give reason: What are noble gases? Give two examples of noble gases.

Write major uses of carbon and it's compounds

Why can't two carbons form 4 bonds?

What type of structure does lithium have?

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain ? Plants→Goat→Lion

Give the balanced chemical reaction of sodium with ethanol.

Derive the formula of relative error from x = a/b

Write equations for each of the above metal which reacts with water.

What do you understand by 'chemical reaction' ?

Which of the following is a polar molecule? } (1) Para dichlorobenzene } (2) Carbon tetrachloride } (3) Tetrachloroethene } (4) }HO-benzeneOH

14.The number of ions produced by potassium hexacyanoferrate (2) is

A. Phenyl methanamineB. N, N - DimethylanilineC. N - Methyl anilineD. BenzenamineChoose the correct order of basic nature of the above amines.

Question 5(b)Write word equations and then balanced equations for the reaction taking place when:(b) Dilute hydrochloric acid reacts with magnesium ribbon

does electron affinity increase or decrease down the group ?

What happens when water is added to quick lime?

Write the balanced chemical equation for the following and identify the type of reaction in each case – (A)Potassium bromide(aq)+Barium iodide(aq)→Potassium iodide(aq)+Barium bromide(s) (B)Zinc carbonate(s)→Zinc oxide(s)+Carbon dioxide(g)

60. Lithium exist in nature in the form of two isotope li-6 and li-7 with atomic masses 6.0151u and 7.0160u and the percentage 8.24 and 91.76 respectively. Calculate average atomic mass.

450cm3 of nitrogen monoxide and 200cm3 of oxygen are mixed together and ignited. Calculate the composition of the resulting mixture. 2NO+O2→2NO2

At very low temperature according to the rock salt varies with temperature according to the law C=kT³÷To³, where k=1940J/milk and To=281K .The heat required to raised the temperatures of 2 moles of the rock salt from 10K to 50K

52. 11.6 L of CH_4 and 22.4 L of C_2H_4 at stp are mixed. What is the vapour density of mixture and what is the average molecular wt. of mixture

48. Give reason for the higher boiling point of ethanol in comparison to metgoxymethane.

the volume of 1.0 g of hydrogen at ntp

Aqueous solution of which salts will have a pH value less than 7. a)K2HPO4b)Na2Sc)KH2PO4d)FeCl3

How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second:

Give the name and formula of two(a) strong monobasic acids(b) weak dibasic acids(c) non-volatile acids(d) volatile acids

Which of the following order is/are correct regarding boiling point?

condider a reversible reaction 2A+B-->2C having equilibrium cons†an t 25.if the reaction vessel having 2,0.25and 0.5moles of A,B and C resp. in 100 l vessel then what will be the dirction of reaction forward backward or exist n equilibrium

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is : (a) A and B (b) B and D (c) A and C (d) D and E

Write the three uses of ethyne.

Question 27What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.

Draw the electron dot structure for [3 MARKS] (a) ethanoic acid (b) ethanol (c) F2