15280 + Interview Questions in Chemistry Page 97 InterviewSolution

4801.	Why Mendeleev's choice of formulae of compounds as the basic for deciding the position of an element in his table was a good one? How would this lead to elements with similar chemical properties being placed in the same group?
Answer» Why Mendeleev's choice of formulae of compounds as the basic for deciding the position of an element in his table was a good one? How would this lead to elements with similar chemical properties being placed in the same group?

Discussion

4802.	A compound 'X' consists of 4.8% carbon and 95.2% bromine by mass.(i) Determine the empirical formula of this compound working correct to one decimal place.(C = 12, Br = 80)(ii) If the vapour density of the compound is 252, what is the molecular formula of the compound?(iii) Name the type of chemical reaction by which X can be prepared from ethane.
Answer» A compound 'X' consists of 4.8% carbon and 95.2% bromine by mass. (i) Determine the empirical formula of this compound working correct to one decimal place. (C = 12, Br = 80) (ii) If the vapour density of the compound is 252, what is the molecular formula of the compound? (iii) Name the type of chemical reaction by which X can be prepared from ethane.

Discussion

4803.	What is crystallography ?
Answer» What is crystallography ?

Discussion

4804.	what will be the empirical formula for the following: % of Na=29.11 % of S=40.51
Answer» what will be the empirical formula for the following: % of Na=29.11 % of S=40.51

Discussion

4805.	18 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahls method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is (1) 29.5 (2) 59.0 (3) 47.4 (4) 23.7
Answer» 18 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahls method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is (1) 29.5 (2) 59.0 (3) 47.4 (4) 23.7

Discussion

4806.	C14 is a beta active nucleus. A sample ofC14H4 gas kept in a closed vessel showsincrease in pressure with time. This is due to (a) the formation of N14H3 and H2 (b) the formation of B11H3 and H2 (c) the formation of C142H4 and H2 (d) the formation of C12H3, N14H2 and H2
Answer» C14 is a beta active nucleus. A sample of C14H4 gas kept in a closed vessel shows increase in pressure with time. This is due to (a) the formation of N14H3 and H2 (b) the formation of B11H3 and H2 (c) the formation of C14 2H4 and H2 (d) the formation of C12H3, N14H2 and H2

Discussion

4807.	45. Why HCl is considered as inorganic acid as it is found in human beings?
Answer» 45. Why HCl is considered as inorganic acid as it is found in human beings?

Discussion

4808.	28.The volume of 0.1 M oxalic acid that can be completely oxidised by 20 ml of 0.025 M KMnO4 solution is
Answer» 28.The volume of 0.1 M oxalic acid that can be completely oxidised by 20 ml of 0.025 M KMnO4 solution is

Discussion

4809.	Eored of the half-cell Hg2Cl2(s)+2e−→2Hg(s)+2Cl−(aq) is 0.27V. If pKsp corresponding to solubility product for Hg2Cl2(s) is 17 then find the E∘red for the half cell Hg2+2(aq)+2e→2Hg(s). (Given 2.303RTF=0.06)
Answer» $E_{r e d}^{o}$ of the half-cell $H g_{2} C l_{2} (s) + 2 e^{-} \to 2 H g (s) + 2 C l^{-} (a q)$ is $0.27 V$ . If $p K_{s p}$ corresponding to solubility product for $H g_{2} C l_{2} (s)$ is 17 then find the $E_{r e d}^{\circ}$ for the half cell $H g_{2}^{2 +} (a q) + 2 e \to 2 H g (s) .$ (Given $\frac{2.303 R T}{F} = 0.06)$

Discussion

4810.	What kind of salt will form when weak base will react with weak acid?Also what will be it's pH?
Answer» What kind of salt will form when weak base will react with weak acid?Also what will be it's pH?

Discussion

4811.	What happens when silver nitrate solution is added to sodium chloride solution ? (a) Write the equation for the reaction which takes place. (b) Name the type of reaction involved.
Answer» What happens when silver nitrate solution is added to sodium chloride solution ? (a) Write the equation for the reaction which takes place. (b) Name the type of reaction involved.

4811.

What happens when silver nitrate solution is added to sodium chloride solution ? (a) Write the equation for the reaction which takes place. (b) Name the type of reaction involved.

Answer»

What happens when silver nitrate solution is added to sodium chloride solution ?

(a) Write the equation for the reaction which takes place.

(b) Name the type of reaction involved.

Discussion

4812.	Calculate the number of oxygen atoms in 10 millimoles of [Fe(H2O)5NO]SO4:
Answer» Calculate the number of oxygen atoms in 10 millimoles of $[F e (H_{2} O)_{5} N O] S O_{4}$ :

Discussion

4813.	34. Calculate the volume of HCL (strength 73 gram HCL per litre ) required to neutralize the Sodium Hydroxide formed by action of water on 0.46g of sodium- 1. 15 ml 2. 45ml 3. 50ml 4. 10ml
Answer» 34. Calculate the volume of HCL (strength 73 gram HCL per litre ) required to neutralize the Sodium Hydroxide formed by action of water on 0.46g of sodium- 1. 15 ml 2. 45ml 3. 50ml 4. 10ml

Discussion

4814.	Question 34Which of the following non-metals is a liquid?(a) Carbon(b) Bromine(c) Phosphorus(d) Sulphur
Answer» Question 34 Which of the following non-metals is a liquid? (a) Carbon (b) Bromine (c) Phosphorus (d) Sulphur

Discussion

4815.	What are the reactants for the production of baking soda:
Answer» What are the reactants for the production of baking soda:

Discussion

4816.	140) Two identically charged spheres are suspended by strings of equal length. When they are immersed in kerosene, the angle between their strings remains the same as it was in the air. Find the density of the spheres. (The diectric { constant of kerosene is 2 and its density is 800
Answer» 140) Two identically charged spheres are suspended by strings of equal length. When they are immersed in kerosene, the angle between their strings remains the same as it was in the air. Find the density of the spheres. (The diectric { constant of kerosene is 2 and its density is 800

Discussion

4817.	Which is the salt when heated releases brown fumes and write is reaction?
Answer» Which is the salt when heated releases brown fumes and write is reaction?

Discussion

4818.	It is given that CH_3-CH_3^+ is more stable than CD_3-CH_3^+ but how as we know that -CD_3 is having more +I effect?
Answer» It is given that CH_3-CH_3^+ is more stable than CD_3-CH_3^+ but how as we know that -CD_3 is having more +I effect?

Discussion

4819.	how are alpha and beta carbons arranged?
Answer» how are alpha and beta carbons arranged?

Discussion

4820.	what is the difference between anti-aromatic and non-aromatic compounds?
Answer» what is the difference between anti-aromatic and non-aromatic compounds?

Discussion

4821.	Why Hydrochloric acid is a mineral acid though we can found HCL in gastric acid
Answer» Why Hydrochloric acid is a mineral acid though we can found HCL in gastric acid

Discussion

4822.	Cao (s) + H2O (l) → Ca(OH)2 (aq) + heat. What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is Exothermic.
Answer» Cao (s) + $H_{2} O$ (l) → $C a (O H)_{2}$ (aq) + heat. What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) $H_{2} O$ is liquid. (iv) $H_{2} O$ is in vapour state. (v) $C a (O H)_{2}$ forms a solution with water (vi) The reaction is Exothermic.

4822.

Cao (s) + H2O (l) → Ca(OH)2 (aq) + heat. What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is Exothermic.

Answer»

Cao (s) + $H_{2} O$ (l) → $C a (O H)_{2}$ (aq) + heat.

What can be inferred from the above reaction?

(i) CaO is solid.

(ii) CaO is reactive with water.

(iii) $H_{2} O$ is liquid.

(iv) $H_{2} O$ is in vapour state.

(v) $C a (O H)_{2}$ forms a solution with water

(vi) The reaction is Exothermic.

Discussion

4823.	10.20 ml H202 sol. React completely with 20ml of KMnO4 sol. Under acidic medium . The same vol.of KMnO4 required 10ml of MnSO4 in a neutral medium to give brown PPT. Of MnO2. This PPT. was reacted completely with 10ml. Of 0.2M Na2C2O4 under acidic medium. Find the molarity of H2O2?
Answer» 10.20 ml H202 sol. React completely with 20ml of KMnO4 sol. Under acidic medium . The same vol.of KMnO4 required 10ml of MnSO4 in a neutral medium to give brown PPT. Of MnO2. This PPT. was reacted completely with 10ml. Of 0.2M Na2C2O4 under acidic medium. Find the molarity of H2O2?

Discussion

4824.	What is the action of litmus on : (a) Dry ammonia gas (b) Solution of ammonia gas in water
Answer» What is the action of litmus on : (a) Dry ammonia gas (b) Solution of ammonia gas in water

Discussion

4825.	find the amount of 25% of sulphuric acid required to completely react with 25g of calcium carbonate?
Answer» find the amount of 25% of sulphuric acid required to completely react with 25g of calcium carbonate?

Discussion

4826.	78.Which of the following is an electron deficient compound? A) B2H6 B)CO2 C)NaBH4 D)Al2Cl6
Answer» 78.Which of the following is an electron deficient compound? A) B2H6 B)CO2 C)NaBH4 D)Al2Cl6

Discussion

4827.	Is this right : 2Zn+2Hcl Will give 2ZnCl + H2 Zn reacting with hcl
Answer» Is this right : 2Zn+2Hcl Will give 2ZnCl + H₂ _{Zn reacting with hcl}

4827.

Is this right : 2Zn+2Hcl Will give 2ZnCl + H2 Zn reacting with hcl

Answer»

Is this right :

2Zn+2Hcl Will give 2ZnCl + H₂

_{Zn reacting with hcl}

Discussion

4828.	46. What is polar protic and polar non-protic solvent
Answer» 46. What is polar protic and polar non-protic solvent

Discussion

4829.	Manoj went to a paper industry. the manager of paper industry insisted that H2O2 to be used for bleaching instead of chlorine Manoj had learnt the chlorine is also a bleaching agent. why is H2O2 used instead of Cl2.
Answer» Manoj went to a paper industry. the manager of paper industry insisted that H₂O₂ to be used for bleaching instead of chlorine Manoj had learnt the chlorine is also a bleaching agent. why is H₂O₂ used instead of Cl₂.

Discussion

4830.	Compare the properties of a typical metal and a non-metal on the basis of the following:(a) electronic configuration.(b) nature of the oxides.(c) oxidising or reducing action.(d) conductivity of heat and electricity.
Answer» Compare the properties of a typical metal and a non-metal on the basis of the following: (a) electronic configuration. (b) nature of the oxides. (c) oxidising or reducing action. (d) conductivity of heat and electricity.

Discussion

4831.

Four students A, B, C and D noted the initial colour of the solutions in beakers I, II, III and IV. After inserting zinc rods in each solution and leaving it undisturbed for two hours, noted the colour of each solution again.They recorded their observations in the form of a table given below: Student Colour of the solution I II III IV A Initial Final Colourless Colourless Colourless Colourless Light green Colourless Blue Colourless B Initial Final Colourless Colourless Light yellow Colourless Light green Light green Blue Colourless C Initial Final Colourless Light blue Colourless Colourless Light green Colourless Blue Light blue D Initial Final Light green Colourless Colourless Colourless Light green Dark green Blue Colourless Which student noted the colour change in all the four beakers correctly?

Answer» Four students A, B, C and D noted the initial colour of the solutions in beakers I, II, III and IV. After inserting zinc rods in each solution and leaving it undisturbed for two hours, noted the colour of each solution again.

They recorded their observations in the form of a table given below:

Student	Colour of the solution	I	II	III	IV
A	Initial Final	Colourless Colourless	Colourless Colourless	Light green Colourless	Blue Colourless
B	Initial Final	Colourless Colourless	Light yellow Colourless	Light green Light green	Blue Colourless
C	Initial Final	Colourless Light blue	Colourless Colourless	Light green Colourless	Blue Light blue
D	Initial Final	Light green Colourless	Colourless Colourless	Light green Dark green	Blue Colourless

Which student noted the colour change in all the four beakers correctly?

Discussion

4832.	Which compound is used in photography?
Answer» Which compound is used in photography?

Discussion

4833.	Why is : (a) concentrated sulphuric acid kept in air tight bottles ? (b) H2SO4 is not used as a drying agent for H2S ? (c) sulphuric acid used in the preparation of HCI and HNO3 ? Give equations in both cases.
Answer» Why is : (a) concentrated sulphuric acid kept in air tight bottles ? (b) $H_{2} S O_{4}$ is not used as a drying agent for $H_{2} S$ ? (c) sulphuric acid used in the preparation of HCI and $H N O_{3}$ ? Give equations in both cases.

4833.

Why is : (a) concentrated sulphuric acid kept in air tight bottles ? (b) H2SO4 is not used as a drying agent for H2S ? (c) sulphuric acid used in the preparation of HCI and HNO3 ? Give equations in both cases.

Answer»

Why is :

(a) concentrated sulphuric acid kept in air tight bottles ?

(b) $H_{2} S O_{4}$ is not used as a drying agent for $H_{2} S$ ?

(c) sulphuric acid used in the preparation of HCI and $H N O_{3}$ ? Give equations in both cases.

Discussion

4834.	sometimes body of an automobile begins to rattle when it picks speed why ?
Answer» sometimes body of an automobile begins to rattle when it picks speed why ?

Discussion

4835.	The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called
Answer» The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

Discussion

4836.	10 dm3 of N2 gas and 10 dm3 of gas X at same temperature and pressure contain same number of molecules .Gas X can be
Answer» 10 dm3 of N2 gas and 10 dm3 of gas X at same temperature and pressure contain same number of molecules .Gas X can be

Discussion

4837.	Why do gases always tend to be less soluble in liquid as the temperature is raised ??.
Answer» Why do gases always tend to be less soluble in liquid as the temperature is raised ??.

Discussion

4838.	Two tones of iron ore are containing 94% of Fe2O3 produces iron in pure state . Calculate the weight of iron.
Answer» Two tones of iron ore are containing 94% of Fe2O3 produces iron in pure state . Calculate the weight of iron.

Discussion

4839.	What is redox reaction in simple way ??
Answer» What is redox reaction in simple way ??

Discussion

4840.	Tell the order of stability of carbocation with all the exception
Answer» Tell the order of stability of carbocation with all the exception

Discussion

4841.	Sulphuric acid can be used In the laboratory to prepare the following substances : (a) Hydrogen (b) Carbon dioxide (c) Carbon monoxide (d) Sulphur dioxide (e) Hydrogen chloride (f) Hydrogen sulphide (g) Nitric acid. 1. Derive a balanced equation for each of the shove preparation. 2. In which of the reactions would you use (give numbers only): (i) Dilute Sulphuric acid, (ii) Sulphuric acid. 3. State the chemical property of sulphuric acid illustrated in each of these reactions.
Answer» Sulphuric acid can be used In the laboratory to prepare the following substances : (a) Hydrogen (b) Carbon dioxide (c) Carbon monoxide (d) Sulphur dioxide (e) Hydrogen chloride (f) Hydrogen sulphide (g) Nitric acid. 1. Derive a balanced equation for each of the shove preparation. 2. In which of the reactions would you use (give numbers only): (i) Dilute Sulphuric acid, (ii) Sulphuric acid. 3. State the chemical property of sulphuric acid illustrated in each of these reactions.

Discussion

4842.	Which of the following substance can be used as a cooling agent?
Answer» Which of the following substance can be used as a cooling agent?

Discussion

4843.	The reaction in which hydrogen is added to the substance and oxygen is removed from the substance is called __ reaction.
Answer» The reaction in which hydrogen is added to the substance and oxygen is removed from the substance is called __ reaction.

Discussion

4844.	Which of the following term defines the number of atoms present in one molecule of an element?
Answer» Which of the following term defines the number of atoms present in one molecule of an element?

Discussion

4845.	how does mercury cell becomes dead if its electrolyte is not being used up in any reaction
Answer» how does mercury cell becomes dead if its electrolyte is not being used up in any reaction

Discussion

4846.	what is electro magnetic waves?
Answer» what is electro magnetic waves?

Discussion

4847.	A bottle of commercial sulphuric acid and density 1.78g/cc is labelled as 86% by weight. What is the molarity of acid??
Answer» A bottle of commercial sulphuric acid and density 1.78g/cc is labelled as 86% by weight. What is the molarity of acid??

Discussion

4848.	Industrially, ammonia is obtained by direct combination of nitrogen and hydrogen.(i) Write the balanced equation for the direct combination of nitrogen with hydrogen.(ii) Which of the metals-iron, platinum, copper-catalyse this direct combination?(iii) Is the formation of ammonia promoted by high pressure or low pressure?
Answer» Industrially, ammonia is obtained by direct combination of nitrogen and hydrogen. (i) Write the balanced equation for the direct combination of nitrogen with hydrogen. (ii) Which of the metals-iron, platinum, copper-catalyse this direct combination? (iii) Is the formation of ammonia promoted by high pressure or low pressure?

Discussion

4849.	The fuel which usually burns with a blue flame is : (a) coal (b) LPG (c) candle wax (c) kerosene (in lamp)
Answer» The fuel which usually burns with a blue flame is : (a) coal (b) LPG (c) candle wax (c) kerosene (in lamp)

Discussion

4850.	What is the name of the above compound?
Answer» What is the name of the above compound?

Discussion

Explore topic-wise InterviewSolutions in .

Why Mendeleev's choice of formulae of compounds as the basic for deciding the position of an element in his table was a good one? How would this lead to elements with similar chemical properties being placed in the same group?

What is crystallography ?

what will be the empirical formula for the following: % of Na=29.11 % of S=40.51

C14 is a beta active nucleus. A sample ofC14H4 gas kept in a closed vessel showsincrease in pressure with time. This is due to (a) the formation of N14H3 and H2 (b) the formation of B11H3 and H2 (c) the formation of C142H4 and H2 (d) the formation of C12H3, N14H2 and H2

45. Why HCl is considered as inorganic acid as it is found in human beings?

28.The volume of 0.1 M oxalic acid that can be completely oxidised by 20 ml of 0.025 M KMnO4 solution is

Eored of the half-cell Hg2Cl2(s)+2e−→2Hg(s)+2Cl−(aq) is 0.27V. If pKsp corresponding to solubility product for Hg2Cl2(s) is 17 then find the E∘red for the half cell Hg2+2(aq)+2e→2Hg(s). (Given 2.303RTF=0.06)

What kind of salt will form when weak base will react with weak acid?Also what will be it's pH?

What happens when silver nitrate solution is added to sodium chloride solution ? (a) Write the equation for the reaction which takes place. (b) Name the type of reaction involved.

Calculate the number of oxygen atoms in 10 millimoles of [Fe(H2O)5NO]SO4:

34. Calculate the volume of HCL (strength 73 gram HCL per litre ) required to neutralize the Sodium Hydroxide formed by action of water on 0.46g of sodium- 1. 15 ml 2. 45ml 3. 50ml 4. 10ml

Question 34Which of the following non-metals is a liquid?(a) Carbon(b) Bromine(c) Phosphorus(d) Sulphur

What are the reactants for the production of baking soda:

140) Two identically charged spheres are suspended by strings of equal length. When they are immersed in kerosene, the angle between their strings remains the same as it was in the air. Find the density of the spheres. (The diectric { constant of kerosene is 2 and its density is 800

Which is the salt when heated releases brown fumes and write is reaction?

It is given that CH_3-CH_3^+ is more stable than CD_3-CH_3^+ but how as we know that -CD_3 is having more +I effect?

how are alpha and beta carbons arranged?

what is the difference between anti-aromatic and non-aromatic compounds?

Why Hydrochloric acid is a mineral acid though we can found HCL in gastric acid

Cao (s) + H2O (l) → Ca(OH)2 (aq) + heat. What can be inferred from the above reaction? (i) CaO is solid. (ii) CaO is reactive with water. (iii) H2O is liquid. (iv) H2O is in vapour state. (v) Ca(OH)2 forms a solution with water (vi) The reaction is Exothermic.

10.20 ml H202 sol. React completely with 20ml of KMnO4 sol. Under acidic medium . The same vol.of KMnO4 required 10ml of MnSO4 in a neutral medium to give brown PPT. Of MnO2. This PPT. was reacted completely with 10ml. Of 0.2M Na2C2O4 under acidic medium. Find the molarity of H2O2?

What is the action of litmus on : (a) Dry ammonia gas (b) Solution of ammonia gas in water

find the amount of 25% of sulphuric acid required to completely react with 25g of calcium carbonate?

78.Which of the following is an electron deficient compound? A) B2H6 B)CO2 C)NaBH4 D)Al2Cl6

Is this right : 2Zn+2Hcl Will give 2ZnCl + H2 Zn reacting with hcl

46. What is polar protic and polar non-protic solvent

Manoj went to a paper industry. the manager of paper industry insisted that H2O​​​​2 to be used for bleaching instead of chlorine Manoj had learnt the chlorine is also a bleaching agent. why is H​​​​​​2​​​​​O​2 used instead of Cl​​​​​2.

Compare the properties of a typical metal and a non-metal on the basis of the following:(a) electronic configuration.(b) nature of the oxides.(c) oxidising or reducing action.(d) conductivity of heat and electricity.

Which compound is used in photography?

Why is : (a) concentrated sulphuric acid kept in air tight bottles ? (b) H2SO4 is not used as a drying agent for H2S ? (c) sulphuric acid used in the preparation of HCI and HNO3 ? Give equations in both cases.

sometimes body of an automobile begins to rattle when it picks speed why ?

The sulphide ores are converted into oxides by heating them strongly in the presence of excess air. This process is called

10 dm3 of N2 gas and 10 dm3 of gas X at same temperature and pressure contain same number of molecules .Gas X can be

Why do gases always tend to be less soluble in liquid as the temperature is raised ??.

Two tones of iron ore are containing 94% of Fe2O3 produces iron in pure state . Calculate the weight of iron.

What is redox reaction in simple way ??

Tell the order of stability of carbocation with all the exception

Which of the following substance can be used as a cooling agent?

The reaction in which hydrogen is added to the substance and oxygen is removed from the substance is called __ reaction.

Which of the following term defines the number of atoms present in one molecule of an element?

how does mercury cell becomes dead if its electrolyte is not being used up in any reaction

what is electro magnetic waves?

A bottle of commercial sulphuric acid and density 1.78g/cc is labelled as 86% by weight. What is the molarity of acid??

The fuel which usually burns with a blue flame is : (a) coal (b) LPG (c) candle wax (c) kerosene (in lamp)

What is the name of the above compound?

Manoj went to a paper industry. the manager of paper industry insisted that H2O2 to be used for bleaching instead of chlorine Manoj had learnt the chlorine is also a bleaching agent. why is H2O2 used instead of Cl2.