15280 + Interview Questions in Chemistry Page 15 InterviewSolution

701.	An electric heater is rated 2200 VA, 220V. If the heater is operated for 1 hour, calculate the energy consumed: (i) in kWh (ii) in J
Answer» An electric heater is rated 2200 VA, 220V. If the heater is operated for 1 hour, calculate the energy consumed: (i) in kWh (ii) in J

701.

An electric heater is rated 2200 VA, 220V. If the heater is operated for 1 hour, calculate the energy consumed: (i) in kWh (ii) in J

Answer»

An electric heater is rated 2200 VA, 220V. If the heater is operated for 1 hour, calculate the energy consumed:

(i) in kWh

(ii) in J

Discussion

702.	The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
Answer» The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?

702.

The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?

Answer»

The question refer to the following salt solutions listed (1) to (6).

Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?

Discussion

703.	45. The coagulation of 100 ml of colloidal sol of gold is compltely prevented by adding 0.05 gr of a substance &quotv" to it before addition of 1ml of 10 percent nacl solution.the gold no of v is
Answer» 45. The coagulation of 100 ml of colloidal sol of gold is compltely prevented by adding 0.05 gr of a substance "v" to it before addition of 1ml of 10 percent nacl solution.the gold no of v is

Discussion

704.	What happens if an acid is mixed with a salt?
Answer» What happens if an acid is mixed with a salt?

Discussion

705.	(a) Which functional group do you think can be present in an organic compound having the molecular formula C5H10O2? Write the formula fo the organic compound. (b) Give one example each of the compounds having the following functional groups : (i) Aldehyde group (ii) Alcohol group (iii) Carboxylic acid group (iv) Halo group (c) Give one example each of the compounds having the following functional groups : (i) Alkene group (ii) Alkyne group
Answer» (a) Which functional group do you think can be present in an organic compound having the molecular formula $C_{5} H_{10} O_{2}$ ? Write the formula fo the organic compound. (b) Give one example each of the compounds having the following functional groups : (i) Aldehyde group (ii) Alcohol group (iii) Carboxylic acid group (iv) Halo group (c) Give one example each of the compounds having the following functional groups : (i) Alkene group (ii) Alkyne group

Discussion

706.	You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:(a) only copper hydroxide(b) only zinc hydroxide(c) both copper hydroxide and zinc hydroxide.
Answer» You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve: (a) only copper hydroxide (b) only zinc hydroxide (c) both copper hydroxide and zinc hydroxide.

Discussion

707.	Select the appropriate option for the blank. He ____ never understand my problems, will he?
Answer» Select the appropriate option for the blank. He ____ never understand my problems, will he?

707.

Select the appropriate option for the blank. He ____ never understand my problems, will he?

Answer»

Select the appropriate option for the blank.

He ____ never understand my problems, will he?

Discussion

708.	Among the following metals, the strongest reducing agent is:
Answer» Among the following metals, the strongest reducing agent is:

Discussion

709.	Why atoms have only 2 electrons in its first shell and how do We know it?
Answer» Why atoms have only 2 electrons in its first shell and how do We know it?

Discussion

710.	What will happen if Cu rod alone is dipped in cuso4 solution Reduction or oxidation of copper and Zn rod dipped in znso4 alone (cu and Zn rod are not connected)? If reduction then why not oxidation and vice versa?
Answer» What will happen if Cu rod alone is dipped in cuso4 solution Reduction or oxidation of copper and Zn rod dipped in znso4 alone (cu and Zn rod are not connected)? If reduction then why not oxidation and vice versa?

Discussion

711.	Which of the following represents the correct order of increasing first ionisation enthalpies of Ca, Ba, S, Se and Ar?
Answer» Which of the following represents the correct order of increasing first ionisation enthalpies of $C a, B a, S, S e$ and $A r$ ?

Discussion

712.	61 Calculate the bond length of XeF2,XeF4,XeF6 and arrange it in decreasing order according to Xe-F bond length ? Gives the reason of shortening of bond length?
Answer» 61 Calculate the bond length of XeF2,XeF4,XeF6 and arrange it in decreasing order according to Xe-F bond length ? Gives the reason of shortening of bond length?

Discussion

713.	7 mole of carbon combine with excess of oxygen to form Co2 gas. Calculate the number of moles of CO2 produces and weightage of oxygen used
Answer» 7 mole of carbon combine with excess of oxygen to form Co2 gas. Calculate the number of moles of CO2 produces and weightage of oxygen used

Discussion

714.	Question 2Which of the following is a source of rayon?(a) Wool(b) PET(c) Wood pulp(d) Silk
Answer» Question 2 Which of the following is a source of rayon? (a) Wool (b) PET (c) Wood pulp (d) Silk

Discussion

715.	(1) What is an atomic symbol?(2) Write the symbols of the following elements: Chlorine, Carbon, Oxygen, Aluminium
Answer» (1) What is an atomic symbol? (2) Write the symbols of the following elements: Chlorine, Carbon, Oxygen, Aluminium

Discussion

716.	Name the gas evolved:The gas produced on heating sodium nitrate.
Answer» Name the gas evolved: The gas produced on heating sodium nitrate.

Discussion

717.	How many g atoms of hydrogen are present in 0.02 mole of cuso4.5h20?
Answer» How many g atoms of hydrogen are present in 0.02 mole of cuso4.5h20?

Discussion

718.	which of the elements has the strongest tendency to form electrovalent compond? 1. Li 2. Na 3. Be 4. M
Answer» which of the elements has the strongest tendency to form electrovalent compond? 1. Li 2. Na 3. Be 4. M

Discussion

719.	Why is repiration considered an exothermic process ?
Answer» Why is repiration considered an exothermic process ?

Discussion

720.	Most elements are found in the free state in nature. Do you agree? Give reasons.
Answer» Most elements are found in the free state in nature. Do you agree? Give reasons.

Discussion

721.	What will be the product formed when sodium reacts with water, oxygen and hydrogen gas?
Answer» What will be the product formed when sodium reacts with water, oxygen and hydrogen gas?

Discussion

722.	Question 17In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?(a) T4(b) T2(c) T1(d) T3
Answer» Question 17 In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available? (a) T4 (b) T2 (c) T1 (d) T3

Discussion

723.	The maximum number of isomers possible for n-pentane is.3
Answer» The maximum number of isomers possible for n-pentane is. 3

Discussion

724.	If the pressure of N2 and H2 mixture in a closed apparatus is 100 atm and 20% of the mixture reacts then the pressure at the same temperature would be?
Answer» If the pressure of N2 and H2 mixture in a closed apparatus is 100 atm and 20% of the mixture reacts then the pressure at the same temperature would be?

Discussion

725.	Ph-OH + dil HNO_3--> A (major) Ph-NH_2+ conc. H_2SO_4-->B (major) Identify A & B
Answer» Ph-OH + dil HNO_3--> A (major) Ph-NH_2+ conc. H_2SO_4-->B (major) Identify A & B

Discussion

726.	Which of the following is an alloy of a metal and a non metal?
Answer» Which of the following is an alloy of a metal and a non metal?

Discussion

727.	Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.
Answer» Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

Discussion

728.	How will you prepare slides without drying quickly?
Answer» How will you prepare slides without drying quickly?

Discussion

729.	A numismatist (coin collector) has been collecting gold coins, silver coins and copper coins for a long time. One day he observed a black coating on silver coins and green coating on copper coins. Which chemical process is responsible for these coatings. Also name the chemical formula of the black and green coatings. [3 MARKS]
Answer» A numismatist (coin collector) has been collecting gold coins, silver coins and copper coins for a long time. One day he observed a black coating on silver coins and green coating on copper coins. Which chemical process is responsible for these coatings. Also name the chemical formula of the black and green coatings. [3 MARKS]

Discussion

730.	Which one of the following oxides is expected to exhibit paramagnetic behaviour?a) CO2b) SO2c) CIO2d) SiO2
Answer» Which one of the following oxides is expected to exhibit paramagnetic behaviour? a) CO2 b) SO2 c) CIO2 d) SiO2

Discussion

731.	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
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

Discussion

732.	%S character of bonding orbital of sulphur in H2S is
Answer» %S character of bonding orbital of sulphur in H2S is

Discussion

733.	The salt which will give an acidic solution on dissolving in water is : (a) KCl (b) NH4Cl (c) Na2CO3 (d) CH3COONa
Answer» The salt which will give an acidic solution on dissolving in water is : (a) $K C l$ (b) $N H_{4} C l$ (c) $N a_{2} C O_{3}$ (d) $C H_{3} C O O N a$

733.

The salt which will give an acidic solution on dissolving in water is : (a) KCl (b) NH4Cl (c) Na2CO3 (d) CH3COONa

Answer»

The salt which will give an acidic solution on dissolving in water is :

(a) $K C l$

(b) $N H_{4} C l$

(c) $N a_{2} C O_{3}$

(d) $C H_{3} C O O N a$

Discussion

734.	Calculate the number o fatoms of each kind in 5.3 grams of sodium carbonate.
Answer» Calculate the number o fatoms of each kind in 5.3 grams of sodium carbonate.

Discussion

735.	Name the substances which make water (i) temporary hard (ii) permanent hard.
Answer» Name the substances which make water (i) temporary hard (ii) permanent hard.

Discussion

736.	A solid AB has the NaCl structure. If the radius of the cation A+ is 120 pm, the maximum possible value of the radius of the anion B− is:
Answer» A solid AB has the NaCl structure. If the radius of the cation $A^{+}$ is 120 pm, the maximum possible value of the radius of the anion $B^{-}$ is:

Discussion

737.	Question 47 A salt X is formed and gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is one which you have named. Also, write chemical equation of the reaction involved.
Answer» Question 47 A salt X is formed and gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is one which you have named. Also, write chemical equation of the reaction involved.

Discussion

738.	Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Answer» Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

Discussion

739.	What are suspensions? Explain with an example.
Answer» What are suspensions? Explain with an example.

Discussion

740.	A homogeneous ideal gaseous reaction AB2(g)⇌A(g)+2B(g) is carried out in a 25 litre flask at~270C. The initial amount of AB2 was 1 mole and the equilibrium pressure was 1.9 atm. The value of Kp is x×10−2 . The value of x is ..... (Integer answer)
Answer» A homogeneous ideal gaseous reaction $A B_{2 (g)} ⇌ A_{(g)} + {2 B}_{(g)}$ is carried out in a 25 litre flask at~ $27^{0} C$ . The initial amount of $A B_{2}$ was 1 mole and the equilibrium pressure was 1.9 atm. The value of $K_{p}$ is $x \times 10^{- 2}$ . The value of x is ..... (Integer answer)

Discussion

741.	Standard heat of formation of ammonia is- x kJ/mol.The heat of reaction when 28 gm of N2(g) reacted with 6 g of H2(g) at S.T.P
Answer» Standard heat of formation of ammonia is- x kJ/mol.The heat of reaction when 28 gm of N2(g) reacted with 6 g of H2(g) at S.T.P

Discussion

742.	we know that in ionic bond atoms are held together by force of attraction between the oppositely charged ions.by what force are the atoms held together in a covalent bond ?
Answer» we know that in ionic bond atoms are held together by force of attraction between the oppositely charged ions.by what force are the atoms held together in a covalent bond ?

Discussion

743.	Why energy is released when an electron is added in the outermost shell of an isolated gaseous atom ?
Answer» Why energy is released when an electron is added in the outermost shell of an isolated gaseous atom ?

Discussion

744.	Cyclotrimeta phosphoric acid has total number of P doublebond O. and P single bond O bonds respectively _?
Answer» Cyclotrimeta phosphoric acid has total number of P doublebond O. and P single bond O bonds respectively _?

Discussion

745.	The two isotopes of chlorine are 3517Cl and 3717Cl in the ratio of 3:1. What is the average atomic mass of the chlorine atom?
Answer» The two isotopes of chlorine are ³⁵₁₇Cl and ³⁷₁₇Cl in the ratio of 3:1. What is the average atomic mass of the chlorine atom?

Discussion

746.	Question 5Which of the following are correct structural isomers of butane?(i)(ii)(iii)(iv) (a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (ii)(d) (iii) and (iv)
Answer» Question 5 Which of the following are correct structural isomers of butane? (i) (ii) (iii) (iv) (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (ii) (d) (iii) and (iv)

Discussion

747.	The molecular mass of oxygen is 32. What does it indicate?
Answer» The molecular mass of oxygen is 32. What does it indicate?

Discussion

748.	Ammonia gas is collected in an inverted gas jar by the __(upward/downward) displacement of air.
Answer» Ammonia gas is collected in an inverted gas jar by the __(upward/downward) displacement of air.

Discussion

749.	Write balanced equations for the reaction of the dilute sulphuric acid with each of the following: (a) Copper carbonate (b) Lead nitrate solution (c) Zinc hydroxide. [3 MARKS]
Answer» Write balanced equations for the reaction of the dilute sulphuric acid with each of the following: (a) Copper carbonate (b) Lead nitrate solution (c) Zinc hydroxide. [3 MARKS]

Discussion

750.	Which of the following statements are true regarding smelting?
Answer» Which of the following statements are true regarding smelting?

Discussion

Explore topic-wise InterviewSolutions in .

An electric heater is rated 2200 VA, 220V. If the heater is operated for 1 hour, calculate the energy consumed: (i) in kWh (ii) in J

The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?

45. The coagulation of 100 ml of colloidal sol of gold is compltely prevented by adding 0.05 gr of a substance &quotv" to it before addition of 1ml of 10 percent nacl solution.the gold no of v is

What happens if an acid is mixed with a salt?

You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:(a) only copper hydroxide(b) only zinc hydroxide(c) both copper hydroxide and zinc hydroxide.

Select the appropriate option for the blank. He ____ never understand my problems, will he?

Among the following metals, the strongest reducing agent is:

Why atoms have only 2 electrons in its first shell and how do We know it?

What will happen if Cu rod alone is dipped in cuso4 solution Reduction or oxidation of copper and Zn rod dipped in znso4 alone (cu and Zn rod are not connected)? If reduction then why not oxidation and vice versa?

Which of the following represents the correct order of increasing first ionisation enthalpies of Ca, Ba, S, Se and Ar?

61 Calculate the bond length of XeF2,XeF4,XeF6 and arrange it in decreasing order according to Xe-F bond length ? Gives the reason of shortening of bond length?

7 mole of carbon combine with excess of oxygen to form Co2 gas. Calculate the number of moles of CO2 produces and weightage of oxygen used

Question 2Which of the following is a source of rayon?(a) Wool(b) PET(c) Wood pulp(d) Silk

(1) What is an atomic symbol?(2) Write the symbols of the following elements: Chlorine, Carbon, Oxygen, Aluminium

Name the gas evolved:The gas produced on heating sodium nitrate.

How many g atoms of hydrogen are present in 0.02 mole of cuso4.5h20?

which of the elements has the strongest tendency to form electrovalent compond? 1. Li 2. Na 3. Be 4. M

Why is repiration considered an exothermic process ?

Most elements are found in the free state in nature. Do you agree? Give reasons.

What will be the product formed when sodium reacts with water, oxygen and hydrogen gas?

Question 17In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?(a) T4(b) T2(c) T1(d) T3

The maximum number of isomers possible for n-pentane is.3

If the pressure of N2 and H2 mixture in a closed apparatus is 100 atm and 20% of the mixture reacts then the pressure at the same temperature would be?

Ph-OH + dil HNO_3--> A (major) Ph-NH_2+ conc. H_2SO_4-->B (major) Identify A & B

Which of the following is an alloy of a metal and a non metal?

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

How will you prepare slides without drying quickly?

Which one of the following oxides is expected to exhibit paramagnetic behaviour?a) CO2b) SO2c) CIO2d) SiO2

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

%S character of bonding orbital of sulphur in H2S is

The salt which will give an acidic solution on dissolving in water is : (a) KCl (b) NH4Cl (c) Na2CO3 (d) CH3COONa

Calculate the number o fatoms of each kind in 5.3 grams of sodium carbonate.

Name the substances which make water (i) temporary hard (ii) permanent hard.

A solid AB has the NaCl structure. If the radius of the cation A+ is 120 pm, the maximum possible value of the radius of the anion B− is:

Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

What are suspensions? Explain with an example.

A homogeneous ideal gaseous reaction AB2(g)⇌A(g)+2B(g) is carried out in a 25 litre flask at~270C. The initial amount of AB2 was 1 mole and the equilibrium pressure was 1.9 atm. The value of Kp is x×10−2 . The value of x is ..... (Integer answer)

Standard heat of formation of ammonia is- x kJ/mol.The heat of reaction when 28 gm of N2(g) reacted with 6 g of H2(g) at S.T.P

we know that in ionic bond atoms are held together by force of attraction between the oppositely charged ions.by what force are the atoms held together in a covalent bond ?

Why energy is released when an electron is added in the outermost shell of an isolated gaseous atom ?

Cyclotrimeta phosphoric acid has total number of P doublebond O. and P single bond O bonds respectively _?

The two isotopes of chlorine are 3517Cl and 3717Cl in the ratio of 3:1. What is the average atomic mass of the chlorine atom?

Question 5Which of the following are correct structural isomers of butane?(i)(ii)(iii)(iv) (a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (ii)(d) (iii) and (iv)

The molecular mass of oxygen is 32. What does it indicate?

Ammonia gas is collected in an inverted gas jar by the __(upward/downward) displacement of air.

Write balanced equations for the reaction of the dilute sulphuric acid with each of the following: (a) Copper carbonate (b) Lead nitrate solution (c) Zinc hydroxide. [3 MARKS]

Which of the following statements are true regarding smelting?