7248 + Interview Questions in Chemistry Page 16 InterviewSolution

751.	A solution contains 50 mL of ethyl alcohol in 450 mL of water. Calculate the concentration of the solution in terms of volume by volume percentage.10
Answer» A solution contains 50 mL of ethyl alcohol in 450 mL of water. Calculate the concentration of the solution in terms of volume by volume percentage. 10

Discussion

752.	What is the 3rd co ordination number of Na+ in NaCl?
Answer» What is the 3rd co ordination number of Na+ in NaCl?

Discussion

753.	Question 3 What is the law of conservation of mass? What are the products of a chemical reaction? Define the following terms : (i) Chemical reaction (ii) Chemical equation (iii) Precipitation reaction
Answer» Question 3 What is the law of conservation of mass? What are the products of a chemical reaction? Define the following terms : (i) Chemical reaction (ii) Chemical equation (iii) Precipitation reaction

753.

Question 3 What is the law of conservation of mass? What are the products of a chemical reaction? Define the following terms : (i) Chemical reaction (ii) Chemical equation (iii) Precipitation reaction

Answer»

Question 3

What is the law of conservation of mass?

What are the products of a chemical reaction?

Define the following terms :

(i) Chemical reaction (ii) Chemical equation (iii) Precipitation reaction

Discussion

754.	Calculate the volume occupied by (i) 28 u nitrogen gas (ii)28g N_{2 }gas at STP?
Answer» Calculate the volume occupied by (i) 28 u nitrogen gas (ii)28g N_{2 }gas at STP?

Discussion

755.	Question 53Look at the figure and answer the following questions. (a) What change would you observe in the calcium Hydroxide solution taken in tube B?(b) Write the reaction involved in test tube A and B respectively(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?(d) How can a solution of lime water be prepared in the laboratory?
Answer» Question 53 Look at the figure and answer the following questions. (a) What change would you observe in the calcium Hydroxide solution taken in tube B? (b) Write the reaction involved in test tube A and B respectively (c) If Ethanol is given instead of Ethanoic acid, would you expect the same change? (d) How can a solution of lime water be prepared in the laboratory?

755.

Question 53Look at the figure and answer the following questions. (a) What change would you observe in the calcium Hydroxide solution taken in tube B?(b) Write the reaction involved in test tube A and B respectively(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?(d) How can a solution of lime water be prepared in the laboratory?

Answer» Question 53

Look at the figure and answer the following questions.

(a) What change would you observe in the calcium Hydroxide solution taken in tube B?

(b) Write the reaction involved in test tube A and B respectively

(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?

(d) How can a solution of lime water be prepared in the laboratory?

Discussion

756.	Can I get the valency chart of elements?
Answer» Can I get the valency chart of elements?

Discussion

757.	A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.
Answer» A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.

Discussion

758.	What will be the nature of the product formed when carbon is reacted with oxygen?
Answer» What will be the nature of the product formed when carbon is reacted with oxygen?

Discussion

759.	Question 10 (a) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas?
Answer» Question 10 (a) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas?

Discussion

760.	Which of the following species has more number of electrons than its neutrons?[Given: mass number, C=12;O=16;F=19;Mg=24]
Answer» Which of the following species has more number of electrons than its neutrons? [Given: mass number, $C = 12; O = 16; F = 19; M g = 24$ ]

Discussion

761.	Explain circumstances leading to acid rain. How does acid rain affect us?
Answer» Explain circumstances leading to acid rain. How does acid rain affect us?

Discussion

762.	50.Give me the detailed information of oxidation of alcohols?
Answer» 50.Give me the detailed information of oxidation of alcohols?

Discussion

763.	Question 11Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called(a) Forest Conservation Day(b) Plantation month(c) Van Mahotsav(d) Wildlife week
Answer» Question 11 Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called (a) Forest Conservation Day (b) Plantation month (c) Van Mahotsav (d) Wildlife week

Discussion

764.	Question 5An object is put one by one in three liquids having different densities. The object floats with 19, 211 and 37 parts of their volumes outside the liquidsurface in liquids of densities d1, d2 and d3 respectively. Which of the following statement is correct?(a) d1 > d2 > d3(b) d1 > d2 < d3(c) d1 < d2 > d3(d) d1 < d2 < d3
Answer» Question 5 An object is put one by one in three liquids having different densities. The object floats with $\frac{1}{9}$ , $\frac{2}{11}$ and $\frac{3}{7}$ parts of their volumes outside the liquidsurface in liquids of densities $d_{1}$ , $d_{2}$ and $d_{3}$ respectively. Which of the following statement is correct? (a) $d_{1}$ > $d_{2}$ > $d_{3}$ (b) $d_{1}$ > $d_{2}$ < $d_{3}$ (c) $d_{1}$ < $d_{2}$ > $d_{3}$ (d) $d_{1}$ < $d_{2}$ < $d_{3}$

Discussion

765.	Question 7Can you store lemon pickle in an aluminium utensil? Explain.
Answer» Question 7 Can you store lemon pickle in an aluminium utensil? Explain.

Discussion

766.	The nature of oxides helps to identify the metals and nonmetals metals conduct an experiment to prove this and record the observations
Answer» The nature of oxides helps to identify the metals and nonmetals metals conduct an experiment to prove this and record the observations

Discussion

767.	Question 4What do you think would be the observation if α -particle scattering experiment is carried out using a foil of a metal other than gold?
Answer» Question 4 What do you think would be the observation if $α$ -particle scattering experiment is carried out using a foil of a metal other than gold?

Discussion

768.	why magnesium react in air
Answer» why magnesium react in air

Discussion

769.	‘Nor sit in learning’s bowerWorn thro’ with the dreary shower’Which of the following is a close paraphrase of the lines above?(i) Nor can I sit in a roofless classroom when it is raining.(ii) Nor can I learn anything at school though teachers go on lecturing and explaining.(iii) Nor can I sit in the school garden for fear of getting wet in the rain.
Answer» ‘Nor sit in learning’s bower Worn thro’ with the dreary shower’ Which of the following is a close paraphrase of the lines above? (i) Nor can I sit in a roofless classroom when it is raining. (ii) Nor can I learn anything at school though teachers go on lecturing and explaining. (iii) Nor can I sit in the school garden for fear of getting wet in the rain.

769.

‘Nor sit in learning’s bowerWorn thro’ with the dreary shower’Which of the following is a close paraphrase of the lines above?(i) Nor can I sit in a roofless classroom when it is raining.(ii) Nor can I learn anything at school though teachers go on lecturing and explaining.(iii) Nor can I sit in the school garden for fear of getting wet in the rain.

Answer»

‘Nor sit in learning’s bower

Worn thro’ with the dreary shower’

Which of the following is a close paraphrase of the lines above?

(i) Nor can I sit in a roofless classroom when it is raining.

(ii) Nor can I learn anything at school though teachers go on lecturing and explaining.

(iii) Nor can I sit in the school garden for fear of getting wet in the rain.

Discussion

770.	An oxide of nitrogen contains 36.8% nitrogen and 63.2% oxygen by mass. Calculate its empirical formula.
Answer» An oxide of nitrogen contains 36.8% nitrogen and 63.2% oxygen by mass. Calculate its empirical formula.

Discussion

771.	why does air flow from high pressure to low pressure?why don't it go exactally opposite?
Answer» why does air flow from high pressure to low pressure?why don't it go exactally opposite?

Discussion

772.	A certain alkaloid has 70.8% carbpon, 6.2%hydrogen, 4.1%nitrogen and rest oxygen what is the empirical formulae:- (1)C_{20}H_{21}NO_4 (2)C_{20}H_{20}NO (3)C_{21}H_{20}NO_3 (4) C_{20}H_{19}NO_3
Answer» A certain alkaloid has 70.8% carbpon, 6.2%hydrogen, 4.1%nitrogen and rest oxygen what is the empirical formulae:- (1)C_{20}H_{21}NO_4 (2)C_{20}H_{20}NO (3)C_{21}H_{20}NO_3 (4) C_{20}H_{19}NO_3

Discussion

773.	Question 3Classify the substances given below into elements and compounds. NaCl, Cu, Zn, Hg, Diamond
Answer» Question 3 Classify the substances given below into elements and compounds. NaCl, Cu, Zn, Hg, Diamond

773.

Question 3Classify the substances given below into elements and compounds. NaCl, Cu, Zn, Hg, Diamond

Answer»

Question 3

Classify the substances given below into elements and compounds.

NaCl, Cu, Zn, Hg, Diamond

Discussion

774.	तिब्बत के मंत्री अपने बेटे के भोलेपन से चिंतित रहते थे।(क) तुम्हारे विचार से वे किन-किन बातों के बारे में सोचकर परेशान होते हैं?(ख) तुम तिब्बत के मंत्री की जगह होती तो क्या उपाय करती?
Answer» तिब्बत के मंत्री अपने बेटे के भोलेपन से चिंतित रहते थे। (क) तुम्हारे विचार से वे किन-किन बातों के बारे में सोचकर परेशान होते हैं? (ख) तुम तिब्बत के मंत्री की जगह होती तो क्या उपाय करती?

774.

तिब्बत के मंत्री अपने बेटे के भोलेपन से चिंतित रहते थे।(क) तुम्हारे विचार से वे किन-किन बातों के बारे में सोचकर परेशान होते हैं?(ख) तुम तिब्बत के मंत्री की जगह होती तो क्या उपाय करती?

Answer»

तिब्बत के मंत्री अपने बेटे के भोलेपन से चिंतित रहते थे।

(क) तुम्हारे विचार से वे किन-किन बातों के बारे में सोचकर परेशान होते हैं?

(ख) तुम तिब्बत के मंत्री की जगह होती तो क्या उपाय करती?

Discussion

775.	Compare stability of H2;B2;Li2
Answer» Compare stability of H2;B2;Li2

Discussion

776.	An artist made a statue of stone but he could not get the entire stone block back. So it is a:-
Answer» An artist made a statue of stone but he could not get the entire stone block back. So it is a:-

Discussion

777.	Formula of a compound having its constituent as X and Y is X2Y3. If the element will form its Chloride then what will be the formula of the compound?
Answer» Formula of a compound having its constituent as X and Y is $X_{2} Y_{3}$ . If the element will form its Chloride then what will be the formula of the compound?

Discussion

778.	Base added to a China rose solution shows which colour?
Answer» Base added to a China rose solution shows which colour?

Discussion

779.	ntTwo elements, X (Atomic mass 16) and Y (Atomic mass 14) combine to form compounds A, B and C. The ratio of different masses of Y which combine with fixed mass of X in A, B and C is 1:3:5. If 32 parts by mass of X combine with 84 parts by mass of Y in B, then in C, 16 parts by mass of X will combine withn nt (A) 14 parts by mass of Y (B) 42 parts by mass of Y (C) 70 parts by mass of Y (D) 82 parts by mass of Y n ntn
Answer» ntTwo elements, X (Atomic mass 16) and Y (Atomic mass 14) combine to form compounds A, B and C. The ratio of different masses of Y which combine with fixed mass of X in A, B and C is 1:3:5. If 32 parts by mass of X combine with 84 parts by mass of Y in B, then in C, 16 parts by mass of X will combine withn nt (A) 14 parts by mass of Y (B) 42 parts by mass of Y (C) 70 parts by mass of Y (D) 82 parts by mass of Y n ntn

Discussion

780.	4. A horizontal cylinder has two sections of unequalcross-section, in which two pistons can move freeyThe pistons are joined by a string. Some gatrapped between the pistons. Spring is massless andin natural length. If this gas is heated, the spring wills is(1) Compress(2) Elongate(3) Remain at natural length(4) Either (1) or (2) depending on initial pressure
Answer» 4. A horizontal cylinder has two sections of unequalcross-section, in which two pistons can move freeyThe pistons are joined by a string. Some gatrapped between the pistons. Spring is massless andin natural length. If this gas is heated, the spring wills is(1) Compress(2) Elongate(3) Remain at natural length(4) Either (1) or (2) depending on initial pressure

Discussion

781.	According to the formula 2n² there should be 18electrons but we put only 8 electrons. Why??
Answer» According to the formula 2n² there should be 18electrons but we put only 8 electrons. Why??

Discussion

782.	Complétez avec les noms des magasins. (N'oubliez pas la prépositions).
Answer» Complétez avec les noms des magasins. (N'oubliez pas la prépositions).

Discussion

783.	In the following reaction 3Br2 + 6CO32- + 3H2O → 5Br - + BrO3- + 6HCO3-
Answer» In the following reaction 3Br₂ + 6CO₃^2- + 3H₂O → 5Br ^-+ BrO₃^- + 6HCO₃^-

Discussion

784.	State any two liquid propellants
Answer» State any two liquid propellants

Discussion

785.	How is photolytic decomposition used in photography ,also write the reaction involved.
Answer» How is photolytic decomposition used in photography ,also write the reaction involved.

Discussion

786.	A sample of drinking water was found to be severely contaminated with chloroform supposed to be carcinogenic in nature the level of contamination was 15ppm (by Mass). Determined the moality of chloroform in water sample
Answer» A sample of drinking water was found to be severely contaminated with chloroform supposed to be carcinogenic in nature the level of contamination was 15ppm (by Mass). Determined the moality of chloroform in water sample

Discussion

787.	The no. Of mole of oxygen in one litre of air containing 21%oxygen by volume under standard condition is 1)0.0093 mole 2)2.10 mole 3)0.186 mole 4)0.21 mole
Answer» The no. Of mole of oxygen in one litre of air containing 21%oxygen by volume under standard condition is 1)0.0093 mole 2)2.10 mole 3)0.186 mole 4)0.21 mole

Discussion

788.	Give reason: Sodium chloride is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solutionsolution as well as in molten state.
Answer» Give reason: Sodium chloride is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solutionsolution as well as in molten state.

Discussion

789.	The composition of an atom P is 13. 11. 11 . What is the mass number?
Answer» The composition of an atom P is 13. 11. 11 . What is the mass number?

Discussion

790.	What is the mass and valency of following elements: 1)Hg 2)Bi 3)Ag 4)Au 5)I 6)F
Answer» What is the mass and valency of following elements: 1)Hg 2)Bi 3)Ag 4)Au 5)I 6)F

Discussion

791.	Calculate equivalent if 10N HCl solution contains 3.6g/ml acid
Answer» Calculate equivalent if 10N HCl solution contains 3.6g/ml acid

Discussion

792.	H2S is a/an ___ agent.
Answer» $H_{2} S$ is a/an ___ agent.

Discussion

793.	Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.
Answer» Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.

Discussion

794.	What is gaseous electrode?Describe them.
Answer» What is gaseous electrode?Describe them.

Discussion

795.	Is the distilled water acidic/basic/neutral? How would you verify it?
Answer» Is the distilled water acidic/basic/neutral? How would you verify it?

Discussion

796.	If the work done on a body for two different time interval i.e., 20s and 40s is the same, then what is the ratio of the power?
Answer» If the work done on a body for two different time interval i.e., $20s$ and $40s$ is the same, then what is the ratio of the power?

Discussion

797.	The moving away of molecules close to a source of heat and of those molecules which are away from the source of heat towards the source is called ____________.
Answer» The moving away of molecules close to a source of heat and of those molecules which are away from the source of heat towards the source is called ____________.

Discussion

798.	___ is the combination of smoke and fog.
Answer» ___ is the combination of smoke and fog.

Discussion

799.	Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?
Answer» Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?

Discussion

800.	Write a short note on global warming ?
Answer» Write a short note on global warming ?

Discussion

Explore topic-wise InterviewSolutions in .

A solution contains 50 mL of ethyl alcohol in 450 mL of water. Calculate the concentration of the solution in terms of volume by volume percentage.10

What is the 3rd co ordination number of Na+ in NaCl?

Question 3 What is the law of conservation of mass? What are the products of a chemical reaction? Define the following terms : (i) Chemical reaction (ii) Chemical equation (iii) Precipitation reaction

Calculate the volume occupied by (i) 28 u nitrogen gas (ii)28g N_{2 }gas at STP?

Can I get the valency chart of elements?

What will be the nature of the product formed when carbon is reacted with oxygen?

Question 10 (a) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas?

Which of the following species has more number of electrons than its neutrons?[Given: mass number, C=12;O=16;F=19;Mg=24]

Explain circumstances leading to acid rain. How does acid rain affect us?

50.Give me the detailed information of oxidation of alcohols?

Question 11Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called(a) Forest Conservation Day(b) Plantation month(c) Van Mahotsav(d) Wildlife week

Question 7Can you store lemon pickle in an aluminium utensil? Explain.

The nature of oxides helps to identify the metals and nonmetals metals conduct an experiment to prove this and record the observations

Question 4What do you think would be the observation if α -particle scattering experiment is carried out using a foil of a metal other than gold?

why magnesium react in air

An oxide of nitrogen contains 36.8% nitrogen and 63.2% oxygen by mass. Calculate its empirical formula.

why does air flow from high pressure to low pressure?why don't it go exactally opposite?

A certain alkaloid has 70.8% carbpon, 6.2%hydrogen, 4.1%nitrogen and rest oxygen what is the empirical formulae:- (1)C_{20}H_{21}NO_4 (2)C_{20}H_{20}NO (3)C_{21}H_{20}NO_3 (4) C_{20}H_{19}NO_3

Question 3Classify the substances given below into elements and compounds. NaCl, Cu, Zn, Hg, Diamond

Compare stability of H2;B2;Li2

An artist made a statue of stone but he could not get the entire stone block back. So it is a:-

Formula of a compound having its constituent as X and Y is X2Y3. If the element will form its Chloride then what will be the formula of the compound?

Base added to a China rose solution shows which colour?

According to the formula 2n² there should be 18electrons but we put only 8 electrons. Why??

Complétez avec les noms des magasins. (N'oubliez pas la prépositions).

In the following reaction 3Br2 + 6CO32- + 3H2O → 5Br - + BrO3- + 6HCO3-

State any two liquid propellants

How is photolytic decomposition used in photography ,also write the reaction involved.

A sample of drinking water was found to be severely contaminated with chloroform supposed to be carcinogenic in nature the level of contamination was 15ppm (by Mass). Determined the moality of chloroform in water sample

The no. Of mole of oxygen in one litre of air containing 21%oxygen by volume under standard condition is 1)0.0093 mole 2)2.10 mole 3)0.186 mole 4)0.21 mole

Give reason: Sodium chloride is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solutionsolution as well as in molten state.

The composition of an atom P is 13. 11. 11 . What is the mass number?

What is the mass and valency of following elements: 1)Hg 2)Bi 3)Ag 4)Au 5)I 6)F

Calculate equivalent if 10N HCl solution contains 3.6g/ml acid

H2S is a/an ___ agent.

Water kept in sunlight gets heat from the sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.

What is gaseous electrode?Describe them.

Is the distilled water acidic/basic/neutral? How would you verify it?

If the work done on a body for two different time interval i.e., 20s and 40s is the same, then what is the ratio of the power?

The moving away of molecules close to a source of heat and of those molecules which are away from the source of heat towards the source is called ____________.

___ is the combination of smoke and fog.

Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?​

Write a short note on global warming ?

Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?