15280 + Interview Questions in Chemistry Page 6 InterviewSolution

251.	The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is : (a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N
Answer» The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is : (a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N

251.

The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is : (a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N

Answer»

The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is :

(a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N

252.	Define endothermic reaction.
Answer» Define endothermic reaction.

Discussion

253.	Question 9(c) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (c) strongly acidic?
Answer» Question 9(c) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (c) strongly acidic?

Discussion

254.	Why do elements gain/lose electrons to form compounds?
Answer» Why do elements gain/lose electrons to form compounds?

Discussion

255.	(i) Write the equation for the laboratory preparation of ethyne (acetylene) from calcium carbide.(ii) What is the special feature of the structure of ethyne?(iii) What would you see when ethyne is bubbled through a solution of bromine in carbon tetrachloride?(iv) Name the addition product formed between ethene and water.
Answer» (i) Write the equation for the laboratory preparation of ethyne (acetylene) from calcium carbide. (ii) What is the special feature of the structure of ethyne? (iii) What would you see when ethyne is bubbled through a solution of bromine in carbon tetrachloride? (iv) Name the addition product formed between ethene and water.

Discussion

256.	Water can be split into hydrogen and oxygen under suitable conditions. The equation representing the change is:2H2O (l) → 2H2 (g) + O2 (g)(i) If a given experiment results in 2500 cm3 of hydrogen being produced, what volume of oxygen is liberated at the same time under the same conditions of temperature and pressure?(ii) Ammonia burns in oxygen and the combustion in the presence of a catalyst may be represented as 2NH3 (g) + 212 O2 (g) → 2NO (g) + 3H2O (l) What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?
Answer» Water can be split into hydrogen and oxygen under suitable conditions. The equation representing the change is: 2H₂O (l) $\overset{}{\to}$ 2H₂ (g) + O₂ (g) (i) If a given experiment results in 2500 cm³ of hydrogen being produced, what volume of oxygen is liberated at the same time under the same conditions of temperature and pressure? (ii) Ammonia burns in oxygen and the combustion in the presence of a catalyst may be represented as 2NH₃ (g) + $2 \frac{1}{2}$ O₂ (g) $\overset{}{\to}$ 2NO (g) + 3H₂O (l) What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?

Discussion

257.	When methane reacts with chlorine, a range of compounds are formed. Identify the compounds.
Answer» When methane reacts with chlorine, a range of compounds are formed. Identify the compounds.

Discussion

258.	Question 39.In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.
Answer» Question 39. In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

Discussion

259.	why should the electrode depend on the temperature?
Answer» why should the electrode depend on the temperature?

Discussion

260.	How many grams of NaOH is required to neutralize 6.1 grams of benzoic acid (C6H5COOH)? Options: a-4 g b- 2 g c-12.2 g d- 6.1 g
Answer» How many grams of NaOH is required to neutralize 6.1 grams of benzoic acid (C6H5COOH)? Options: a-4 g b- 2 g c-12.2 g d- 6.1 g

Discussion

261.	The compound(s) belonging to the carboxylic acid family is/are
Answer» The compound(s) belonging to the carboxylic acid family is/are

Discussion

262.	Which one is a saponification reaction?
Answer» Which one is a saponification reaction?

Discussion

263.	28.Two moles of N2 and two moles of H2 are taken in a closed vessels of 5 litres capacity and suitable conditions are provided for the reaction. when the equilibrium is reached, it is found that a half mole of N2 is used up. The equilibrium concentration of NH3 is
Answer» 28.Two moles of N2 and two moles of H2 are taken in a closed vessels of 5 litres capacity and suitable conditions are provided for the reaction. when the equilibrium is reached, it is found that a half mole of N2 is used up. The equilibrium concentration of NH3 is

Discussion

264.	Which one of the following set has two non-metals having shiny and lustrous surface?
Answer» Which one of the following set has two non-metals having shiny and lustrous surface?

Discussion

265.	what is absoloute zero temperature?
Answer» what is absoloute zero temperature?

Discussion

266.	why non metals do not magnetise?
Answer» why non metals do not magnetise?

Discussion

267.	In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water will make it hard : (a) Sodium chloride, calcium chloride (b) Potassium chloride, sodium chloride (c) Sodium chloride, magnesium chloride (d) Calcium chloride, magnesium chloride
Answer» In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water will make it hard : (a) Sodium chloride, calcium chloride (b) Potassium chloride, sodium chloride (c) Sodium chloride, magnesium chloride (d) Calcium chloride, magnesium chloride

Discussion

268.	The species Ar,K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
Answer» The species $A r, K^{+} a n d C a^{2 +}$ contain the same number of electrons. In which order do their radii increase?

Discussion

269.	What does covalent compounds cointain as the constituent particles
Answer» What does covalent compounds cointain as the constituent particles

Discussion

270.	An azeotropic solution containing A andB has a molar ratio of 2 3. The vapourpressure of pure A and B arerespectively 300 mm of Hg and 400 mmof Hg. The vapour over the solution iscollected and condensed in anothervessel. The mole fraction of A in thefirst drop of liquid formed in the secondcontainer is
Answer» An azeotropic solution containing A andB has a molar ratio of 2 3. The vapourpressure of pure A and B arerespectively 300 mm of Hg and 400 mmof Hg. The vapour over the solution iscollected and condensed in anothervessel. The mole fraction of A in thefirst drop of liquid formed in the secondcontainer is

Discussion

271.	The four elements that make up 96%of all the elements found in the living system are:- (1)C,H,O and P (2)C,N,O and P (3)H,O,C and N (4)C,H,O and P
Answer» The four elements that make up 96%of all the elements found in the living system are:- (1)C,H,O and P (2)C,N,O and P (3)H,O,C and N (4)C,H,O and P

Discussion

272.	50. 4g of metal oxide contains 1.6g of oxygen,then equivelent mass of the metal is
Answer» 50. 4g of metal oxide contains 1.6g of oxygen,then equivelent mass of the metal is

Discussion

273.	What do you notice when acetic acid reacts with (a) litmus, (b) metals, (c) alkalies, (d) alcohol? [4 MARKS]
Answer» What do you notice when acetic acid reacts with (a) litmus, (b) metals, (c) alkalies, (d) alcohol? [4 MARKS]

Discussion

274.	A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?
Answer» A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH₄NO₃ → N₂O +2H₂O What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?

274.

A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?

Answer»

A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP).

NH₄NO₃ → N₂O +2H₂O

What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?

Discussion

275.	Why the first world root of alkene is Ethane.
Answer» Why the first world root of alkene is Ethane.

Discussion

276.	Question 42A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ration of the number of atoms of gold and silver in the ornament.
Answer» Question 42 A silver ornament of mass ‘m’ gram is polished with gold equivalent to $1 %$ of the mass of silver. Compute the ration of the number of atoms of gold and silver in the ornament.

Discussion

277.	What amount of oxygen will react with 6g of sulphur in sulphur trioxide
Answer» What amount of oxygen will react with 6g of sulphur in sulphur trioxide

Discussion

278.	State Aufbau principle.
Answer» State Aufbau principle.

Discussion

279.	Write two examples of naturally occurring substances that are acidic in nature.
Answer» Write two examples of naturally occurring substances that are acidic in nature.

Discussion

280.	Dust chamber removes dust by :
Answer» Dust chamber removes dust by :

Discussion

281.	Chassez l'intrus.1. Nice/Lille/Lyon/Chanel2. La Garonne/Le brie/Le camembert/Le roquefort3. Le bourgogne/Dior/Le bordeaux/Le champagne4. Le Danemark/La Grèce/L'Inde/New York
Answer» Chassez l'intrus. 1. Nice/Lille/Lyon/Chanel 2. La Garonne/Le brie/Le camembert/Le roquefort 3. Le bourgogne/Dior/Le bordeaux/Le champagne 4. Le Danemark/La Grèce/L'Inde/New York

Discussion

282.	(a) What is the general formula of alkenes? Identify the alkenes from the following: C2H6, C2H4, C3H4, C2H2, C3H6(b) Which of the following can give addition reactions? C2H6, C3H8, C3H6, C2H2, CH4Give reason for your choice.
Answer» (a) What is the general formula of alkenes? Identify the alkenes from the following: C₂H₆, C₂H₄, C₃H₄, C₂H₂, C₃H₆ (b) Which of the following can give addition reactions? C₂H₆, C₃H₈, C₃H₆, C₂H₂, CH₄ Give reason for your choice.

Discussion

283.	One litre ofN/2 HCl solution is heated in a beaker. It was observed that when the volume of the solution was reduce to 600 mL, 3.25 g of HCl in lost, calculate the normality of the new solution (1) 1.70 (2) 0.685 (3) 0.342 (4) 0.171
Answer» One litre ofN/2 HCl solution is heated in a beaker. It was observed that when the volume of the solution was reduce to 600 mL, 3.25 g of HCl in lost, calculate the normality of the new solution (1) 1.70 (2) 0.685 (3) 0.342 (4) 0.171

Discussion

284.	What is the difference between ferric and ferrous?
Answer» What is the difference between ferric and ferrous?

Discussion

285.	estimate radius of water molecule given molecular weight of water=18g/mole and Avogadro's number is6\ast10^{23}molecules/mole ,density of water = 1000kg/m^3
Answer» estimate radius of water molecule given molecular weight of water=18g/mole and Avogadro's number is6\ast10^{23}molecules/mole ,density of water = 1000kg/m^3

Discussion

286.	Name the following:(i) Two metals which are found in the free or native state.(ii) The mixture of materials fed into a furnace to extract a metal.(iii) The rocky impurities present in an ore.(iv) The substance added to get rid of gangue in the extraction of metal.(v) The process of heating a substance very strongly in such a way that it does not combine with oxygen.(vi) The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.(vii) Ore of iron referred to as "fool's gold".(viii) The most abundant metal in the crust of the earth.(ix) The chief ore of aluminium.(x) The substance added along with alumina in the Hall-Heroult's process.(xi) The materials used as electrodes in the electrolytic extraction of aluminium.(xii) The kind of welding in which aluminium powder is used.(xiii) The chief metal present in magnalium and duralumin.(xiv) Two metals which occur in nature in free state as well as in combined state.(xv) Name two metals which are always found in combined state.
Answer» Name the following: (i) Two metals which are found in the free or native state. (ii) The mixture of materials fed into a furnace to extract a metal. (iii) The rocky impurities present in an ore. (iv) The substance added to get rid of gangue in the extraction of metal. (v) The process of heating a substance very strongly in such a way that it does not combine with oxygen. (vi) The process in which an ore is heated in air so that oxygen gets added to it to form the oxides. (vii) Ore of iron referred to as "fool's gold". (viii) The most abundant metal in the crust of the earth. (ix) The chief ore of aluminium. (x) The substance added along with alumina in the Hall-Heroult's process. (xi) The materials used as electrodes in the electrolytic extraction of aluminium. (xii) The kind of welding in which aluminium powder is used. (xiii) The chief metal present in magnalium and duralumin. (xiv) Two metals which occur in nature in free state as well as in combined state. (xv) Name two metals which are always found in combined state.

Discussion

287.	The equations given below relate to the manufacture of sodium carbonate (Molecular weight of Na2CO3 = 106).NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl2NaHCO3 → Na2CO3 + H2O + CO2Questions (a) and (b) are based on the production of 21.2 g of sodium carbonate.(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHCO3 = 84)?(b) To produce the mass of sodium hydrogen carbonate, calculate what volume of carbon dioxide, measured at STP would be required?
Answer» The equations given below relate to the manufacture of sodium carbonate (Molecular weight of Na₂CO₃ = 106). NaCl + NH₃ + CO₂ + H₂O $\overset{}{\to}$ NaHCO₃ + NH₄Cl 2NaHCO₃ $\overset{}{\to}$ Na₂CO₃ + H₂O + CO₂ Questions (a) and (b) are based on the production of 21.2 g of sodium carbonate. (a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHCO₃ = 84)? (b) To produce the mass of sodium hydrogen carbonate, calculate what volume of carbon dioxide, measured at STP would be required?

Discussion

288.	Question 1Which of the following pairs will give displacement reactions?a) NaCl solution and copper metalb) MgCl2 solution and aluminum metalc) FeSO4 solution and silver metald) AgNO3 solution and copper metal
Answer» Question 1 Which of the following pairs will give displacement reactions? a) $NaCl$ solution and copper metal b) ${MgCl}_{2}$ solution and aluminum metal c) ${FeSO}_{4}$ solution and silver metal d) ${AgNO}_{3}$ solution and copper metal

Discussion

289.	Why the taken electrode potential is always taken to be reduction even if it is undergoing oxidation?
Answer» Why the taken electrode potential is always taken to be reduction even if it is undergoing oxidation?

Discussion

290.	36.How many bond pair in NO3 negetive ion & O3 (ozone). How calculate it
Answer» 36.How many bond pair in NO3 negetive ion & O3 (ozone). How calculate it

Discussion

291.	39. In which case addition of electrophile does not takes place according to markovnikov's rule: 1. (CH3)2C=CH-CH3 2. CCl3-CH=CH2 3. C6H5-CH=CH2 4. CH3-CH=CH2
Answer» 39. In which case addition of electrophile does not takes place according to markovnikov's rule: 1. (CH3)2C=CH-CH3 2. CCl3-CH=CH2 3. C6H5-CH=CH2 4. CH3-CH=CH2

Discussion

292.	A chemical compound having a smell similar to chlorine gas is used in laundries to remove the yellowness of white clothes. Identify this compound and write the chemical reactions involved in its preparations.
Answer» A chemical compound having a smell similar to chlorine gas is used in laundries to remove the yellowness of white clothes. Identify this compound and write the chemical reactions involved in its preparations.

Discussion

293.	what is the mass of H2so4 which contains 80g of oxygen?
Answer» what is the mass of H2so4 which contains 80g of oxygen?

Discussion

294.	What is the rounded off no. for the no. 3.349 upto 2 significant figures
Answer» What is the rounded off no. for the no. 3.349 upto 2 significant figures

Discussion

295.	HNO3 is ionic or covalent compound and how many type of bond present in it .Does it have ionic bond
Answer» HNO3 is ionic or covalent compound and how many type of bond present in it .Does it have ionic bond

Discussion

296.	A cubical vessel with side 1 cm contains a gas at pressure 'P1'. When the side of the vessel is made 12 cm, the pressure of gas becomes? Assume constant temperature.
Answer» A cubical vessel with side $1 c m$ contains a gas at pressure 'P1'. When the side of the vessel is made $\frac{1}{2}$ cm, the pressure of gas becomes? Assume constant temperature.

Discussion

297.	Which of the following can’t be measured using a screw gauge?
Answer» Which of the following can’t be measured using a screw gauge?

Discussion

298.	(a) How is ethane prepared by Wurtz reaction?(b) How can we prepare ethane by reduction of a halogen compound?
Answer» (a) How is ethane prepared by Wurtz reaction? (b) How can we prepare ethane by reduction of a halogen compound?

Discussion

299.	Whan methyl chloride react with sodium metal which product is form ?
Answer» Whan methyl chloride react with sodium metal which product is form ?

Discussion

300.	24. Assertion-:In B2H6, the terminal B-H bonds are shorter, than the B-H bridge bonds Reason:- The terminal B-H bond order is greater than that of the B-H bridge bond
Answer» 24. Assertion-:In B2H6, the terminal B-H bonds are shorter, than the B-H bridge bonds Reason:- The terminal B-H bond order is greater than that of the B-H bridge bond

Discussion

Explore topic-wise InterviewSolutions in .

The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is : (a) O, F, N (b) N, F, O (c) O, N, F (d) F, O, N

Define endothermic reaction.

Question 9(c) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (c) strongly acidic?

Why do elements gain/lose electrons to form compounds?

When methane reacts with chlorine, a range of compounds are formed. Identify the compounds.

why should the electrode depend on the temperature?

How many grams of NaOH is required to neutralize 6.1 grams of benzoic acid (C6H5COOH)? Options: a-4 g b- 2 g c-12.2 g d- 6.1 g

The compound(s) belonging to the carboxylic acid family is/are

Which one is a saponification reaction?

28.Two moles of N2 and two moles of H2 are taken in a closed vessels of 5 litres capacity and suitable conditions are provided for the reaction. when the equilibrium is reached, it is found that a half mole of N2 is used up. The equilibrium concentration of NH3 is

Which one of the following set has two non-metals having shiny and lustrous surface?

what is absoloute zero temperature?

why non metals do not magnetise?

The species Ar,K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?

What does covalent compounds cointain as the constituent particles

The four elements that make up 96%of all the elements found in the living system are:- (1)C,H,O and P (2)C,N,O and P (3)H,O,C and N (4)C,H,O and P

50. 4g of metal oxide contains 1.6g of oxygen,then equivelent mass of the metal is

What do you notice when acetic acid reacts with (a) litmus, (b) metals, (c) alkalies, (d) alcohol? [4 MARKS]

A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O What volume of dinitrogen oxide is produced at the same time as 8.96 litres of steam?

Why the first world root of alkene is Ethane.

Question 42A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ration of the number of atoms of gold and silver in the ornament.

What amount of oxygen will react with 6g of sulphur in sulphur trioxide

State Aufbau principle.

Write two examples of naturally occurring substances that are acidic in nature.

Dust chamber removes dust by :

Chassez l'intrus.1. Nice/Lille/Lyon/Chanel2. La Garonne/Le brie/Le camembert/Le roquefort3. Le bourgogne/Dior/Le bordeaux/Le champagne4. Le Danemark/La Grèce/L'Inde/New York

(a) What is the general formula of alkenes? Identify the alkenes from the following: C2H6, C2H4, C3H4, C2H2, C3H6(b) Which of the following can give addition reactions? C2H6, C3H8, C3H6, C2H2, CH4​Give reason for your choice.

One litre ofN/2 HCl solution is heated in a beaker. It was observed that when the volume of the solution was reduce to 600 mL, 3.25 g of HCl in lost, calculate the normality of the new solution (1) 1.70 (2) 0.685 (3) 0.342 (4) 0.171

What is the difference between ferric and ferrous?

estimate radius of water molecule given molecular weight of water=18g/mole and Avogadro's number is6\ast10^{23}molecules/mole ,density of water = 1000kg/m^3

Question 1Which of the following pairs will give displacement reactions?a) NaCl solution and copper metalb) MgCl2 solution and aluminum metalc) FeSO4 solution and silver metald) AgNO3 solution and copper metal

Why the taken electrode potential is always taken to be reduction even if it is undergoing oxidation?

36.How many bond pair in NO3 negetive ion & O3 (ozone). How calculate it

39. In which case addition of electrophile does not takes place according to markovnikov's rule: 1. (CH3)2C=CH-CH3 2. CCl3-CH=CH2 3. C6H5-CH=CH2 4. CH3-CH=CH2

A chemical compound having a smell similar to chlorine gas is used in laundries to remove the yellowness of white clothes. Identify this compound and write the chemical reactions involved in its preparations.

what is the mass of H2so4 which contains 80g of oxygen?

What is the rounded off no. for the no. 3.349 upto 2 significant figures

HNO3 is ionic or covalent compound and how many type of bond present in it .Does it have ionic bond

A cubical vessel with side 1 cm contains a gas at pressure 'P1'. When the side of the vessel is made 12 cm, the pressure of gas becomes? Assume constant temperature.

Which of the following can’t be measured using a screw gauge?

(a) How is ethane prepared by Wurtz reaction?(b) How can we prepare ethane by reduction of a halogen compound?

Whan methyl chloride react with sodium metal which product is form ?

24. Assertion-:In B2H6, the terminal B-H bonds are shorter, than the B-H bridge bonds Reason:- The terminal B-H bond order is greater than that of the B-H bridge bond

(a) What is the general formula of alkenes? Identify the alkenes from the following: C2H6, C2H4, C3H4, C2H2, C3H6(b) Which of the following can give addition reactions? C2H6, C3H8, C3H6, C2H2, CH4Give reason for your choice.