7248 + Interview Questions in Chemistry Page 63 InterviewSolution

3101.	Forest fire produces lot of air pollution. Write in brief about the reasons of forest fires.
Answer» Forest fire produces lot of air pollution. Write in brief about the reasons of forest fires.

Discussion

3102.	An element has electronic configuration 2,8,13,2 the no. Of electrons in the element having l = 0
Answer» An element has electronic configuration 2,8,13,2 the no. Of electrons in the element having l = 0

Discussion

3103.	Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?
Answer» Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to generate caustic soda. When $C O_{2}$ is bubbled through a solution of $A$ , it turns cloudy. What is the chemical formula of $A$ ?

Discussion

3104.	Can you name two liquids heavier than water? What will happen if water is poured in a container having any one of the liquids named by you
Answer» Can you name two liquids heavier than water? What will happen if water is poured in a container having any one of the liquids named by you

Discussion

3105.	What is the difference between polymer and cellulose?
Answer» What is the difference between polymer and cellulose?

Discussion

3106.	All of the following are considered as the essentials of chemical equation, except Options are:- a)it should represent a true chemical change. b)it should be balanced. c)elementary subs†an ces should not be in molecular form d)
Answer» All of the following are considered as the essentials of chemical equation, except Options are:- a)it should represent a true chemical change. b)it should be balanced. c)elementary subs†an ces should not be in molecular form d)

Discussion

3107.	Two oxides of a certain metal were separately heated incurrent of hydrogen until constant weights were obtained.The water produced in each case was carefully collectedand weighed. 2 g of each oxide gave, respectively 0.2517and 0.4526 g of water. This observation illustrates(a) law of conservation of mass(b) law of constant proportions(c) law of multiple proportions(d) law of reciprocal proportions.
Answer» Two oxides of a certain metal were separately heated incurrent of hydrogen until constant weights were obtained.The water produced in each case was carefully collectedand weighed. 2 g of each oxide gave, respectively 0.2517and 0.4526 g of water. This observation illustrates(a) law of conservation of mass(b) law of constant proportions(c) law of multiple proportions(d) law of reciprocal proportions.

Discussion

3108.	निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−कंपनीके वकील का कत्लकरने के बादवज़ीर अली नेअपनी हिफ़ाज़तकैसे की?
Answer» निम्नलिखित प्रश्न का उत्तर (25-30 शब्दों में) लिखिए − कंपनी के वकील का कत्ल करने के बाद वज़ीर अली ने अपनी हिफ़ाज़त कैसे की?

3108.

निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−कंपनीके वकील का कत्लकरने के बादवज़ीर अली नेअपनी हिफ़ाज़तकैसे की?

Answer»

निम्नलिखित
प्रश्न का उत्तर
(25-30 शब्दों
में)
लिखिए
−

कंपनी
के वकील का कत्ल
करने के बाद
वज़ीर अली ने
अपनी हिफ़ाज़त
कैसे की?

Discussion

3109.	If air resistance is considered then, for a body thrown up with a certain speed , will it have more speed or lesser speed when it comes back to the same point?
Answer» If air resistance is considered then, for a body thrown up with a certain speed , will it have more speed or lesser speed when it comes back to the same point?

Discussion

3110.	why is law of constant composition invalid for compounds concerned with isotopes or non stoichiometric compounds?
Answer» why is law of constant composition invalid for compounds concerned with isotopes or non stoichiometric compounds?

Discussion

3111.	Which of the following metals burn with a white dazzling light, with oxygen?
Answer» Which of the following metals burn with a white dazzling light, with oxygen?

Discussion

3112.	Metal 'X? reacts very slowly with water but reacts vigorously with steam. Identify metal X.
Answer» Metal 'X? reacts very slowly with water but reacts vigorously with steam. Identify metal X.

Discussion

3113.	For an electron revolving around Li++ nucleus:
Answer» For an electron revolving around Li++ nucleus:

Discussion

3114.	Fractional distillation refers to:
Answer» Fractional distillation refers to:

Discussion

3115.	How are electronegativity and bond angle related?
Answer» How are electronegativity and bond angle related?

Discussion

3116.	Identify the chemical process depicted in the pictures given below.
Answer» Identify the chemical process depicted in the pictures given below.

Discussion

3117.	Hydrochloric acid turns:
Answer» Hydrochloric acid turns:

3117.

Hydrochloric acid turns:

Answer»

Hydrochloric acid turns:

Discussion

3118.	Write a short note on the Ganga action plan?
Answer» Write a short note on the Ganga action plan?

Discussion

3119.	34.Change in volume when 100ml of PH3 decomposed to solid phosphorousand H2 gas: 1)increase in 50ml 2)decrease in 50ml 3)increase in 150ml 4)decrease in 200ml
Answer» 34.Change in volume when 100ml of PH3 decomposed to solid phosphorousand H2 gas: 1)increase in 50ml 2)decrease in 50ml 3)increase in 150ml 4)decrease in 200ml

Discussion

3120.	Which type of plastic is used in manufacturing toys and combs and why? [2 MARKS]
Answer» Which type of plastic is used in manufacturing toys and combs and why? [2 MARKS]

Discussion

3121.	How burning of fuels such as coal petroleum and diesel lead to acid rain. How acid rain is harmful
Answer» How burning of fuels such as coal petroleum and diesel lead to acid rain. How acid rain is harmful

Discussion

3122.	Why is it suggested not to store curd in a metal container?
Answer» Why is it suggested not to store curd in a metal container?

Discussion

3123.	Why orbits are also called energy levels?
Answer» Why orbits are also called energy levels?

Discussion

3124.	Won't the salt, which we have provided in salt bridge get consumed over a period or time?Thus, is salt bridge a temporary method to get rid of the problem?
Answer» Won't the salt, which we have provided in salt bridge get consumed over a period or time? Thus, is salt bridge a temporary method to get rid of the problem?

Discussion

3125.	A square frame of side L is dipped in a liquid.On taking out a membrane is formed.If the surface tension of liquid is T then force acting on one side of frame is.
Answer» A square frame of side L is dipped in a liquid.On taking out a membrane is formed.If the surface tension of liquid is T then force acting on one side of frame is.

Discussion

3126.	Why graphite is a conductor of electricity?
Answer» Why graphite is a conductor of electricity?

Discussion

3127.	Ankita is suffering from high fever. The doctor told the family members to give her hot coffee as soon as possible. For making coffee out of LPG, Coal and Cow dung father chosed LPG. Why did he do so?
Answer» Ankita is suffering from high fever. The doctor told the family members to give her hot coffee as soon as possible. For making coffee out of LPG, Coal and Cow dung father chosed LPG. Why did he do so?

Discussion

3128.	Difference between metal and non metals?
Answer» Difference between metal and non metals?

Discussion

3129.	What are the laws of radioactive disintegration ?
Answer» What are the laws of radioactive disintegration ?

Discussion

3130.	Hybradisation of icl2
Answer» Hybradisation of icl2

Discussion

3131.	शब्दों का ऐसा प्रयोग जिससे कविता के किसी खास भाव या दृश्य में ध्वन्यात्मक प्रभाव पैदा हो, नाद-सौंदर्य कहलाता है। उत्साह कविता में ऐसे कौन-से शब्द हैं जिनमें नाद-सौंदर्य मौजूद है, छाँटकर लिखें।
Answer» शब्दों का ऐसा प्रयोग जिससे कविता के किसी खास भाव या दृश्य में ध्वन्यात्मक प्रभाव पैदा हो, नाद-सौंदर्य कहलाता है। उत्साह कविता में ऐसे कौन-से शब्द हैं जिनमें नाद-सौंदर्य मौजूद है, छाँटकर लिखें।

Discussion

3132.	Hydrogen in its molecular forms exists as ________ gas.
Answer» Hydrogen in its molecular forms exists as ________ gas.

Discussion

3133.	Prove the law of conservation of mass when the mass ofBaCl 2 =20.8g,NaSO 4 =14.2g,BaSO 4 =23.3g,NaCl=16.7g
Answer» Prove the law of conservation of mass when the mass of BaCl 2 =20.8g,NaSO 4 =14.2g,BaSO 4 =23.3g,NaCl=16.7g

Discussion

3134.	Question 3Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?(a) iron nail(b) aluminium wire(c) copper plate(d) piece of coal
Answer» Question 3 Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal? (a) iron nail (b) aluminium wire (c) copper plate (d) piece of coal

Discussion

3135.	Maximum freezing point will be for the complexsalt solution of (assume equal ionization of allcomplex salts)(1) 1M\lbrack Fe(H2O) \rbrack CI(2) 1MIFE(H2O),CIICH2O(3) 1MIFE(H2O),Cl\rbrack.2H20(4) 1M\lbrack Fe(H2O),Cl\rbrack.3H20
Answer» Maximum freezing point will be for the complexsalt solution of (assume equal ionization of allcomplex salts)(1) 1M\lbrack Fe(H2O) \rbrack CI(2) 1MIFE(H2O),CIICH2O(3) 1MIFE(H2O),Cl\rbrack.2H20(4) 1M\lbrack Fe(H2O),Cl\rbrack.3H20

Discussion

3136.	Explain how petroleum is formed with the help of a diagram.
Answer» Explain how petroleum is formed with the help of a diagram.

Discussion

3137.	Geothermal energy is feasible in regions that
Answer» $Geothermal energy is feasible in regions that$

Discussion

3138.	Materials derived from petroleum that are then used to make synthetic fibres are called _____.
Answer» Materials derived from petroleum that are then used to make synthetic fibres are called _____.

Discussion

3139.	When lead nitrate reacts with potassium iodide, yellow precipitate of
Answer» When lead nitrate reacts with potassium iodide, yellow precipitate of

Discussion

3140.	What is the fundamental thing of a compound ?
Answer» What is the fundamental thing of a compound ?

Discussion

3141.	Is Nylon , Arcylic, polyester a type of plastic. If it is then which type of plastic
Answer» Is Nylon , Arcylic, polyester a type of plastic. If it is then which type of plastic

Discussion

3142.	Which of the following is an example of reversible change?
Answer» Which of the following is an example of reversible change?

Discussion

3143.	What is difference between strong and weak base
Answer» What is difference between strong and weak base

Discussion

3144.	Metals that melt when taken on human palm are:
Answer» Metals that melt when taken on human palm are:

Discussion

3145.	70. Radius of first bohr orbit of hydrogen is x.if an electron is moving in 3rd orbit of the same de broglie wavelength of the electron will be
Answer» 70. Radius of first bohr orbit of hydrogen is x.if an electron is moving in 3rd orbit of the same de broglie wavelength of the electron will be

Discussion

3146.	20. Is conductance directly proportional to concentration? Also provide explanation.
Answer» 20. Is conductance directly proportional to concentration? Also provide explanation.

Discussion

3147.	A proton is fixed at origin and another proton is released from rest from a point at dis†an ce r from the origin. Its speed at 2r from origin is (m = mass of proton, e = charge of proton)
Answer» A proton is fixed at origin and another proton is released from rest from a point at dis†an ce r from the origin. Its speed at 2r from origin is (m = mass of proton, e = charge of proton)

Discussion

3148.	which conditions will increase the boiling point of water at cons†an ttemperature and pressure?
Answer» which conditions will increase the boiling point of water at cons†an ttemperature and pressure?

Discussion

3149.	Give reasons. (a) In Rutherford’s experiment, some alpha rays collide with the gold sheet and are turned back. (b) During ion formation, an electric charge develops on the elements. (c) Why does ionisation take place? (d) In an atom, electrons do not fall into the nucleus even though they are negatively charged. (e) All the mass of an atom is concentrated in the nucleus.
Answer» Give reasons. (a) In Rutherford’s experiment, some alpha rays collide with the gold sheet and are turned back. (b) During ion formation, an electric charge develops on the elements. (c) Why does ionisation take place? (d) In an atom, electrons do not fall into the nucleus even though they are negatively charged. (e) All the mass of an atom is concentrated in the nucleus.

3149.

Give reasons. (a) In Rutherford’s experiment, some alpha rays collide with the gold sheet and are turned back. (b) During ion formation, an electric charge develops on the elements. (c) Why does ionisation take place? (d) In an atom, electrons do not fall into the nucleus even though they are negatively charged. (e) All the mass of an atom is concentrated in the nucleus.

Answer»

Give reasons.

(a) In Rutherford’s experiment, some alpha rays collide with the gold sheet and are turned back.

(b) During ion formation, an electric charge develops on the elements.

(c) Why does ionisation take place?

(d) In an atom, electrons do not fall into the nucleus even though they are negatively charged.

(e) All the mass of an atom is concentrated in the nucleus.

Discussion

3150.	60. Δ Hr of which of the following reactions is zero? (1) H2(g)→ 2H+(g) + 2e- (2) 2H(g) + aq → 2H+(aq) + 2e- (3) 2H(g)→ 2H+(g) + 2e- (4) H2(g) + aq → 2H+(aq) + 2e-
Answer» 60. Δ Hr of which of the following reactions is zero? (1) H2(g)→ 2H+(g) + 2e- (2) 2H(g) + aq → 2H+(aq) + 2e- (3) 2H(g)→ 2H+(g) + 2e- (4) H2(g) + aq → 2H+(aq) + 2e-

Discussion

Explore topic-wise InterviewSolutions in .

Forest fire produces lot of air pollution. Write in brief about the reasons of forest fires.

An element has electronic configuration 2,8,13,2 the no. Of electrons in the element having l = 0

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?

Can you name two liquids heavier than water? What will happen if water is poured in a container having any one of the liquids named by you

What is the difference between polymer and cellulose?

All of the following are considered as the essentials of chemical equation, except Options are:- a)it should represent a true chemical change. b)it should be balanced. c)elementary subs†an ces should not be in molecular form d)

निम्नलिखितप्रश्न का उत्तर(25-30 शब्दोंमें)लिखिए−कंपनीके वकील का कत्लकरने के बादवज़ीर अली नेअपनी हिफ़ाज़तकैसे की?

If air resistance is considered then, for a body thrown up with a certain speed , will it have more speed or lesser speed when it comes back to the same point?

why is law of constant composition invalid for compounds concerned with isotopes or non stoichiometric compounds?

Which of the following metals burn with a white dazzling light, with oxygen?

Metal 'X? reacts very slowly with water but reacts vigorously with steam. Identify metal X.

For an electron revolving around Li++ nucleus:

Fractional distillation refers to:

How are electronegativity and bond angle related?

Identify the chemical process depicted in the pictures given below.

Hydrochloric acid turns:

Write a short note on the Ganga action plan?

34.Change in volume when 100ml of PH3 decomposed to solid phosphorousand H2 gas: 1)increase in 50ml 2)decrease in 50ml 3)increase in 150ml 4)decrease in 200ml

Which type of plastic is used in manufacturing toys and combs and why? [2 MARKS]

How burning of fuels such as coal petroleum and diesel lead to acid rain. How acid rain is harmful

Why is it suggested not to store curd in a metal container?

Why orbits are also called energy levels?

Won't the salt, which we have provided in salt bridge get consumed over a period or time?Thus, is salt bridge a temporary method to get rid of the problem?

A square frame of side L is dipped in a liquid.On taking out a membrane is formed.If the surface tension of liquid is T then force acting on one side of frame is.

Why graphite is a conductor of electricity?

Ankita is suffering from high fever. The doctor told the family members to give her hot coffee as soon as possible. For making coffee out of LPG, Coal and Cow dung father chosed LPG. Why did he do so?

Difference between metal and non metals?

What are the laws of radioactive disintegration ?

Hybradisation of icl2

Hydrogen in its molecular forms exists as ________ gas.

Prove the law of conservation of mass when the mass ofBaCl 2 =20.8g,NaSO 4 =14.2g,BaSO 4 =23.3g,NaCl=16.7g

Question 3Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?(a) iron nail(b) aluminium wire(c) copper plate(d) piece of coal

Maximum freezing point will be for the complexsalt solution of (assume equal ionization of allcomplex salts)(1) 1M\lbrack Fe(H2O) \rbrack CI(2) 1MIFE(H2O),CIICH2O(3) 1MIFE(H2O),Cl\rbrack.2H20(4) 1M\lbrack Fe(H2O),Cl\rbrack.3H20

Explain how petroleum is formed with the help of a diagram.

Geothermal energy is feasible in regions that

Materials derived from petroleum that are then used to make synthetic fibres are called _____.

When lead nitrate reacts with potassium iodide, yellow precipitate of

What is the fundamental thing of a compound ?

Is Nylon , Arcylic, polyester a type of plastic. If it is then which type of plastic

Which of the following is an example of reversible change?

What is difference between strong and weak base

Metals that melt when taken on human palm are:

70. Radius of first bohr orbit of hydrogen is x.if an electron is moving in 3rd orbit of the same de broglie wavelength of the electron will be

20. Is conductance directly proportional to concentration? Also provide explanation.

A proton is fixed at origin and another proton is released from rest from a point at dis†an ce r from the origin. Its speed at 2r from origin is (m = mass of proton, e = charge of proton)

which conditions will increase the boiling point of water at cons†an ttemperature and pressure?

60. Δ Hr of which of the following reactions is zero? (1) H2(g)→ 2H+(g) + 2e- (2) 2H(g) + aq → 2H+(aq) + 2e- (3) 2H(g)→ 2H+(g) + 2e- (4) H2(g) + aq → 2H+(aq) + 2e-