15280 + Interview Questions in Chemistry Page 81 InterviewSolution

4001.	The colour of methyl orange indicator in a solution is yellow. The pH of this solution in likely to be: (a) 7 (b) less than 7 (c) 0 (d) more than 7
Answer» The colour of methyl orange indicator in a solution is yellow. The pH of this solution in likely to be: (a) 7 (b) less than 7 (c) 0 (d) more than 7

4001.

The colour of methyl orange indicator in a solution is yellow. The pH of this solution in likely to be: (a) 7 (b) less than 7 (c) 0 (d) more than 7

Answer»

The colour of methyl orange indicator in a solution is yellow. The pH of this solution in likely to be:

(a) 7

(b) less than 7

(c) 0

(d) more than 7

Discussion

4002.	How many carbon atoms are there in rubisco?
Answer» How many carbon atoms are there in rubisco?

Discussion

4003.	What are the products formed when MgO reacts with HCl?
Answer» What are the products formed when $MgO$ reacts with $HCl$ ?

Discussion

4004.	Identify the position isomer pairs.
Answer» Identify the position isomer pairs.

Discussion

4005.	Write balanced equations for the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the contact process. Name the catalyst used in the contact process.
Answer» Write balanced equations for the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the contact process. Name the catalyst used in the contact process.

Discussion

4006.	Industrially, NH3 is obtained by direct combination between nitrogen and hydrogen.(i) Write correctly balanced equation for the direct combination of nitrogen with hydrogen.(ii) Which metal catalyses the reaction?(iii) Is the formation of NH3 promoted by the use of high pressure or low pressure?(iv) Is ammonia more dense or less dense than air?(v) What property of NH3 is demonstrated by fountain experiment?(vi) Write correctly balanced equation for the reaction between NH3 and sulphuric acid.
Answer» Industrially, NH₃ is obtained by direct combination between nitrogen and hydrogen. (i) Write correctly balanced equation for the direct combination of nitrogen with hydrogen. (ii) Which metal catalyses the reaction? (iii) Is the formation of NH₃ promoted by the use of high pressure or low pressure? (iv) Is ammonia more dense or less dense than air? (v) What property of NH₃ is demonstrated by fountain experiment? (vi) Write correctly balanced equation for the reaction between NH₃ and sulphuric acid.

Discussion

4007.	4. Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.
Answer» 4. Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

Discussion

4008.	What is meant by biodiversity depletion?
Answer» What is meant by biodiversity depletion?

Discussion

4009.	6. How many gram of CaO is obtained on heating 100g of CaCO3?
Answer» 6. How many gram of CaO is obtained on heating 100g of CaCO3?

Discussion

4010.	Union Government has notified Solid Waste Management Rules, 2016. Consider the following statements and find the incorrect one:
Answer» Union Government has notified Solid Waste Management Rules, 2016. Consider the following statements and find the incorrect one:

Discussion

4011.	When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. What is the cation [positive ion] present in solution B? What is the probable colour of solution B?
Answer» When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. What is the cation [positive ion] present in solution B? What is the probable colour of solution B?

Discussion

4012.	Calculate total mole of electron in 1kg
Answer» Calculate total mole of electron in 1kg

Discussion

4013.	What is the result of oxidation of ethyl alcohol?
Answer» What is the result of oxidation of ethyl alcohol?

Discussion

4014.	Which of the following is a Döbereiner's triad?
Answer» Which of the following is a Döbereiner's triad?

Discussion

4015.	The reaction of ethanol with ethanoic acid in presence of concentrated H2SO4, produces _____.
Answer» The reaction of ethanol with ethanoic acid in presence of concentrated $H_{2} S O_{4}$ , produces _____.

Discussion

4016.	molten metal chloride is used for extraction of sodium metal . why cant we use solid metal chloride
Answer» molten metal chloride is used for extraction of sodium metal . why cant we use solid metal chloride

Discussion

4017.	Write the observations for the following:(i) NaOH is added drop-wise till in excess to a solution of zinc sulphate.(ii) NH4OH is added first in a small quantity and then in excess to a solution of copper sulphate.(iii) Excess NH4OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.(iv) Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas.(v) A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.(vi) Decomposition of bicarbonates by dil. H2SO4.2NaHCO3 + H2SO4 → Na2SO4 + 2H2O + 2CO22KHCO3 + H2SO4 → K2SO4 + 2H2O + 2CO2
Answer» Write the observations for the following: (i) NaOH is added drop-wise till in excess to a solution of zinc sulphate. (ii) NH₄OH is added first in a small quantity and then in excess to a solution of copper sulphate. (iii) Excess NH₄OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution. (iv) Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas. (v) A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas. (vi) Decomposition of bicarbonates by dil. H₂SO₄. 2NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2H₂O + 2CO₂ 2KHCO₃ + H₂SO₄ → K₂SO₄ + 2H₂O + 2CO₂

Discussion

4018.	Which oxide can be reduced to the metal using carbon?
Answer» Which oxide can be reduced to the metal using carbon?

Discussion

4019.	Convert ethanol into ethene using (a) solid dehydrating agent (b) hot conc. H2SO4 ? Give only balanced equations.
Answer» Convert ethanol into ethene using (a) solid dehydrating agent (b) hot conc. $H_{2} S O_{4}$ ? Give only balanced equations.

Discussion

4020.	Input A and B are in states 1 and O respectively . What is the only possible stable state of input X and Y
Answer» Input A and B are in states 1 and O respectively . What is the only possible stable state of input X and Y

Discussion

4021.	Nitrogen and oxygen gas react as illustrated by the equation given below:N2 (g) + O2 (g) → 2NOCalculate the volume of each reacting gas required to produce 1400 cm3 of nitric oxide.
Answer» Nitrogen and oxygen gas react as illustrated by the equation given below: N₂ (g) + O₂ (g) → 2NO Calculate the volume of each reacting gas required to produce 1400 cm³ of nitric oxide.

Discussion

4022.	Burning of magnesium ribbon is exothermic or endothermic reaction?
Answer» Burning of magnesium ribbon is exothermic or endothermic reaction?

Discussion

4023.	14. pH of a saturated solution of Ba(OH)2 is 12.The value of solubility product (Ksp) of Ba(OH)2 is:
Answer» 14. pH of a saturated solution of Ba(OH)2 is 12.The value of solubility product (Ksp) of Ba(OH)2 is:

Discussion

4024.	calculate the volume occupied by 28u nitrogen gas
Answer» calculate the volume occupied by 28u nitrogen gas

Discussion

4025.	What are the domain and range of the fuction f(x)=ln(ln(ln(x)))?
Answer» What are the domain and range of the fuction f(x)=ln(ln(ln(x)))?

Discussion

4026.	Write the name of the compound which is 1. A component of washing soda. 2. Used as an oxidising agent in many chemical industries .
Answer» Write the name of the compound which is 1. A component of washing soda. 2. Used as an oxidising agent in many chemical industries .

Discussion

4027.	a solid compound XY has NaCl structure. if radius of cation is 100pm the radius of anion will be?
Answer» a solid compound XY has NaCl structure. if radius of cation is 100pm the radius of anion will be?

Discussion

4028.	6 g of hydrogen gas reacts with 64 g of oxygen gas under specific conditions in a vessel. What is the amount of water produced in this reaction?
Answer» 6 g of hydrogen gas reacts with 64 g of oxygen gas under specific conditions in a vessel. What is the amount of water produced in this reaction?

Discussion

4029.	En = –313.6/n2 kcal/mole. If the value of E = –34.84 kcal/mole, to which value does ‘n’ correspond? (1) 4 (2) 3 (3) 2 (4) 1
Answer» En = –313.6/n2 kcal/mole. If the value of E = –34.84 kcal/mole, to which value does ‘n’ correspond? (1) 4 (2) 3 (3) 2 (4) 1

Discussion

4030.	Which of the following methods, (a), (b), (c), (d) or (e) is generally used for preparing the chlorides listed below from (i) to (v). Answer by writing down the chloride and the letter pertaining to the corresponding method. Each letter is to be used only once.(a) Action of an acid on a metal.(b) Action of an acid on an oxide or carbonate.(c) Direct combination.(d) Neutralisation of an alkali by an acid.(e) Precipitation (double decomposition).(i) copper (II) chloride(ii) iron (III) chloride)(iii) iron (II) chloride(iv) lead (II) chloride(v) sodium chloride
Answer» Which of the following methods, (a), (b), (c), (d) or (e) is generally used for preparing the chlorides listed below from (i) to (v). Answer by writing down the chloride and the letter pertaining to the corresponding method. Each letter is to be used only once. (a) Action of an acid on a metal. (b) Action of an acid on an oxide or carbonate. (c) Direct combination. (d) Neutralisation of an alkali by an acid. (e) Precipitation (double decomposition). (i) copper (II) chloride (ii) iron (III) chloride) (iii) iron (II) chloride (iv) lead (II) chloride (v) sodium chloride

Discussion

4031.	Which of the following has the shortest carbon-carbon bond length?
Answer» Which of the following has the shortest carbon-carbon bond length?

Discussion

4032.	Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?
Answer» Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?

Discussion

4033.	Why do potato chips manufacturers fill the packet of chips with nitrogen gas
Answer» Why do potato chips manufacturers fill the packet of chips with nitrogen gas

Discussion

4034.	2.Why metals don't react with water?
Answer» 2.Why metals don't react with water?

Discussion

4035.	Why do gold ornaments look new even after several years of use?
Answer» Why do gold ornaments look new even after several years of use?

Discussion

4036.	In the following reactionThe stable conformer of 'A' is
Answer» In the following reaction The stable conformer of 'A' is

Discussion

4037.	how to find equivalent weight in redox reaction
Answer» how to find equivalent weight in redox reaction

Discussion

4038.	Let the heat of hydrogenation of benzene is 61 kilo calorie per mole and its resonance energy is 36 kilo calorie per mole, then the heat of hydrogenation of cyclohexene and cyclohexadiene molecule respectively are: (a) 20.3, 40.6 (b) 40.6, 20.3 (c) 32.3, 64.6 (d) 25, 50
Answer» Let the heat of hydrogenation of benzene is 61 kilo calorie per mole and its resonance energy is 36 kilo calorie per mole, then the heat of hydrogenation of cyclohexene and cyclohexadiene molecule respectively are: (a) 20.3, 40.6 (b) 40.6, 20.3 (c) 32.3, 64.6 (d) 25, 50

Discussion

4039.	Which of the following reaction is irreversible in nature?
Answer» Which of the following reaction is irreversible in nature?

Discussion

4040.	Alkaline KMnO4 and acidified K2Cr2O7 are:
Answer» Alkaline $K M n O_{4}$ and acidified $K_{2} C r_{2} O_{7}$ are:

Discussion

4041.	Question 20.1Write the balanced chemical equation for the following reaction and identify the type of reaction.Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
Answer» Question 20.1 Write the balanced chemical equation for the following reaction and identify the type of reaction. Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

4041.

Question 20.1Write the balanced chemical equation for the following reaction and identify the type of reaction.Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

Answer»

Question 20.1

Write the balanced chemical equation for the following reaction and identify the type of reaction.

Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

Discussion

4042.	37.Pkaof acetic acid is 4.74 which implies that Option At ph 4.74 half of aceti acid molecule. R dissociated. At ph 4.74 dissociation is maximum. 2
Answer» 37.Pkaof acetic acid is 4.74 which implies that Option At ph 4.74 half of aceti acid molecule. R dissociated. At ph 4.74 dissociation is maximum. 2

Discussion

4043.	16. If mole fraction of NaOH in its aqueous solution is 0.2 thenmolality of NaoH approximately 1. 13.9 2. 10.9 3. 5.8 4. 16
Answer» 16. If mole fraction of NaOH in its aqueous solution is 0.2 thenmolality of NaoH approximately 1. 13.9 2. 10.9 3. 5.8 4. 16

Discussion

4044.	What is observed when to a solution of lead nitrate, a small amount of sodium hydroxide is added?
Answer» What is observed when to a solution of lead nitrate, a small amount of sodium hydroxide is added?

Discussion

4045.	If the ionization potential of helium atom is 24.6 V, the energy required to ionize it, will be,
Answer» If the ionization potential of helium atom is $24.6 V$ , the energy required to ionize it, will be,

Discussion

4046.	Write balanced equation for potassium hydrogen carbonate and dilute sulphuric acid.
Answer» Write balanced equation for potassium hydrogen carbonate and dilute sulphuric acid.

Discussion

4047.	What do we call self linking property of carbon? Catenation?
Answer» What do we call self linking property of carbon? Catenation?

Discussion

4048.	Lewis structure of Li is _____
Answer» Lewis structure of Li is _____

Discussion

4049.	Which among the following statements are correct for the given redox reaction: Pb3O4+8HClHeat−−−→3PbCl2+Cl2+4H2O I. HCl is oxidised II. HCl is reduced III. Pb3O4 is reduced IV. Pb3O4 is oxidised
Answer» Which among the following statements are correct for the given redox reaction: $P b_{3} O_{4} + 8 H C l H e a t - -- \to 3 P b C l_{2} + C l_{2} + 4 H_{2} O$ I. $H C l$ is oxidised II. $H C l$ is reduced III. $P b_{3} O_{4}$ is reduced IV. $P b_{3} O_{4}$ is oxidised

Discussion

4050.	What kind of reaction is rusting of iron?explain.
Answer» What kind of reaction is rusting of iron?explain.

Discussion

Explore topic-wise InterviewSolutions in .

The colour of methyl orange indicator in a solution is yellow. The pH of this solution in likely to be: (a) 7 (b) less than 7 (c) 0 (d) more than 7

How many carbon atoms are there in rubisco?

What are the products formed when MgO reacts with HCl?

Identify the position isomer pairs.

Write balanced equations for the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the contact process. Name the catalyst used in the contact process.

4. Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

What is meant by biodiversity depletion?

6. How many gram of CaO is obtained on heating 100g of CaCO3?

Union Government has notified Solid Waste Management Rules, 2016. Consider the following statements and find the incorrect one:

When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. What is the cation [positive ion] present in solution B? What is the probable colour of solution B?

Calculate total mole of electron in 1kg

What is the result of oxidation of ethyl alcohol?

Which of the following is a Döbereiner's triad?

The reaction of ethanol with ethanoic acid in presence of concentrated H2SO4, produces _____.

molten metal chloride is used for extraction of sodium metal . why cant we use solid metal chloride

Which oxide can be reduced to the metal using carbon?

Convert ethanol into ethene using (a) solid dehydrating agent (b) hot conc. H2SO4 ? Give only balanced equations.

Input A and B are in states 1 and O respectively . What is the only possible stable state of input X and Y

Nitrogen and oxygen gas react as illustrated by the equation given below:N2 (g) + O2 (g) → 2NOCalculate the volume of each reacting gas required to produce 1400 cm3 of nitric oxide.

Burning of magnesium ribbon is exothermic or endothermic reaction?

14. pH of a saturated solution of Ba(OH)2 is 12.The value of solubility product (Ksp) of Ba(OH)2 is:

calculate the volume occupied by 28u nitrogen gas

What are the domain and range of the fuction f(x)=ln(ln(ln(x)))?

Write the name of the compound which is 1. A component of washing soda. 2. Used as an oxidising agent in many chemical industries .

a solid compound XY has NaCl structure. if radius of cation is 100pm the radius of anion will be?

6 g of hydrogen gas reacts with 64 g of oxygen gas under specific conditions in a vessel. What is the amount of water produced in this reaction?

En = –313.6/n2 kcal/mole. If the value of E = –34.84 kcal/mole, to which value does ‘n’ correspond? (1) 4 (2) 3 (3) 2 (4) 1

Which of the following has the shortest carbon-carbon bond length?

Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?

Why do potato chips manufacturers fill the packet of chips with nitrogen gas

2.Why metals don't react with water?

Why do gold ornaments look new even after several years of use?

In the following reactionThe stable conformer of 'A' is

how to find equivalent weight in redox reaction

Let the heat of hydrogenation of benzene is 61 kilo calorie per mole and its resonance energy is 36 kilo calorie per mole, then the heat of hydrogenation of cyclohexene and cyclohexadiene molecule respectively are: (a) 20.3, 40.6 (b) 40.6, 20.3 (c) 32.3, 64.6 (d) 25, 50

Which of the following reaction is irreversible in nature?

Alkaline KMnO4 and acidified K2Cr2O7 are:

Question 20.1Write the balanced chemical equation for the following reaction and identify the type of reaction.Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

37.Pkaof acetic acid is 4.74 which implies that Option At ph 4.74 half of aceti acid molecule. R dissociated. At ph 4.74 dissociation is maximum. 2

16. If mole fraction of NaOH in its aqueous solution is 0.2 thenmolality of NaoH approximately 1. 13.9 2. 10.9 3. 5.8 4. 16

What is observed when to a solution of lead nitrate, a small amount of sodium hydroxide is added?

If the ionization potential of helium atom is 24.6 V, the energy required to ionize it, will be,

Write balanced equation for potassium hydrogen carbonate and dilute sulphuric acid.

What do we call self linking property of carbon? Catenation?

Lewis structure of Li is _____

Which among the following statements are correct for the given redox reaction: Pb3O4+8HClHeat−−−→3PbCl2+Cl2+4H2O I. HCl is oxidised II. HCl is reduced III. Pb3O4 is reduced IV. Pb3O4 is oxidised

What kind of reaction is rusting of iron?explain.