15280 + Interview Questions in Chemistry Page 51 InterviewSolution

2501.	At 37°C and 0.1atm, the mass density of phosphorus vapour is 0.5 g/L. What is the molecular formula of phosphorus (take R=0.08 atm L/mol K)
Answer» At 37°C and 0.1atm, the mass density of phosphorus vapour is 0.5 g/L. What is the molecular formula of phosphorus (take R=0.08 atm L/mol K)

Discussion

2502.	Some metallic oxides can be reduced by hydrogen,carbon and carbon monoxide and some cannot.Explain.
Answer» Some metallic oxides can be reduced by hydrogen,carbon and carbon monoxide and some cannot.Explain.

Discussion

2503.	Give any two important uses of neutralisation reaction in daily life.
Answer» Give any two important uses of neutralisation reaction in daily life.

Discussion

2504.	The statement which is not true for the p block elements is:
Answer» The statement which is not true for the p block elements is:

2504.

The statement which is not true for the p block elements is:

Answer»

The statement which is not true for the p block elements is:

Discussion

2505.	Sulphur dioxide gas can be formed by:
Answer» Sulphur dioxide gas can be formed by:

Discussion

2506.	CaCO3(s)--> CaO(s) + CO2(g) The process will be spontaneous at (1) All temperatures (2) T>△ H/△ S 3) T
Answer» CaCO3(s)--> CaO(s) + CO2(g) The process will be spontaneous at (1) All temperatures (2) T>△ H/△ S 3) T

Discussion

2507.	Which of the following is the correct molecular formula of Nitric acid?
Answer» Which of the following is the correct molecular formula of Nitric acid?

Discussion

2508.	Which of the following compounds is brown in colour?
Answer» Which of the following compounds is brown in colour?

Discussion

2509.	18. Ionic conductance of H^+ & SO_4^{2-} are k and y S cm^2 mol^{-1}. Hence equivalent conductivity of H2SO4 is
Answer» 18. Ionic conductance of H^+ & SO_4^{2-} are k and y S cm^2 mol^{-1}. Hence equivalent conductivity of H2SO4 is

Discussion

2510.	What is products of Baeyer Villiger oxidation below?
Answer» What is products of Baeyer Villiger oxidation below?

Discussion

2511.	Where is toluene used?
Answer» Where is toluene used?

Discussion

2512.	Which of the following can be used as a reducing agent in smelting?
Answer» Which of the following can be used as a reducing agent in smelting?

Discussion

2513.	(a) Which two criteria did Mendeleev use to classify the elements in his periodic table?(b) State Mendeleev's periodic law.(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?(d) How and why does the atomic size vary as you go: (i) from left to right along a period? (ii) down a group?
Answer» (a) Which two criteria did Mendeleev use to classify the elements in his periodic table? (b) State Mendeleev's periodic law. (c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table? (d) How and why does the atomic size vary as you go: (i) from left to right along a period? (ii) down a group?

Discussion

2514.	What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur?
Answer» What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur?

Discussion

2515.	Write the formula of co-efficient of range and find its range.
Answer» Write the formula of co-efficient of range and find its range.

Discussion

2516.	45.Why metal produce hydrogen with water
Answer» 45.Why metal produce hydrogen with water

Discussion

2517.	Four faradays of electricity were passed through AgNo3,cadmium sulphate,aluminum sulphate, lead sulphate kept in four vessels using inert electrodes .The ratio of moles of Ag,Cd,Al,Pb deposited will be
Answer» Four faradays of electricity were passed through AgNo3,cadmium sulphate,aluminum sulphate, lead sulphate kept in four vessels using inert electrodes .The ratio of moles of Ag,Cd,Al,Pb deposited will be

Discussion

2518.	33. Solid ammonium carbamate dissociated according to the given reaction NH2COONH4(s) gives 2NH3(g) + CO2(g) Total pressure of the gases in equilibrium is 5 atm. Hence Kp (1)18.5 (2)25 (3)1/5 (4)12.5
Answer» 33. Solid ammonium carbamate dissociated according to the given reaction NH2COONH4(s) gives 2NH3(g) + CO2(g) Total pressure of the gases in equilibrium is 5 atm. Hence Kp (1)18.5 (2)25 (3)1/5 (4)12.5

Discussion

2519.	How to determine the central atom when both the atoms are present in same no
Answer» How to determine the central atom when both the atoms are present in same no

Discussion

2520.	What is the solubility of Al(OH)3,(Ksp=1×10−33) in a buffer solution of pH = 4 at room temperature ?
Answer» What is the solubility of $A l (O H)_{3}, (K_{s p} = 1 \times 10^{- 33})$ in a buffer solution of pH = 4 at room temperature ?

Discussion

2521.	Name the element and the chemical symbol of the alkaline earth metal with the smallest atomic number. What is the number of valence electrons present in it?
Answer» Name the element and the chemical symbol of the alkaline earth metal with the smallest atomic number. What is the number of valence electrons present in it?

Discussion

2522.	Name the compounds required for the laboratory preparation of nitric acid.
Answer» Name the compounds required for the laboratory preparation of nitric acid.

Discussion

2523.	A student was given three solution marked X, Y, and Z, and asked to arrange them in the increasing order of their pH values. The student put two drops of each solution on three strips of universal indicator paper separately. The colours shown by the three indicator strips are as follows:Which of the following gives the correct increasing order of pH values ?(1) Z < X < Y(2) Y < Z < X(3) X < Y < Z(4) Z < Y < X
Answer» A student was given three solution marked X, Y, and Z, and asked to arrange them in the increasing order of their pH values. The student put two drops of each solution on three strips of universal indicator paper separately. The colours shown by the three indicator strips are as follows: Which of the following gives the correct increasing order of pH values ? (1) Z < X < Y (2) Y < Z < X (3) X < Y < Z (4) Z < Y < X

Discussion

2524.	The formula of the compound is A2B5 The number of electrons in the outermost orbits of A and B respectively are
Answer» The formula of the compound is A2B5 The number of electrons in the outermost orbits of A and B respectively are

Discussion

2525.	Which is more stable fumaric acid or maleic acid
Answer» Which is more stable fumaric acid or maleic acid

Discussion

2526.	Which of these is the key compound for the laboratory preparation of sulphuric acid?
Answer» Which of these is the key compound for the laboratory preparation of sulphuric acid?

Discussion

2527.	(a) What kind of particles will be found in a liquid compound which is a nonelectrolyte? (b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water? (c) Cations are formed by ___ (loss / gain) of electrons. (Choose the correct word to fill in the blanks). (d) What ions must be present in a solution used for electroplating a particular metal?
Answer» (a) What kind of particles will be found in a liquid compound which is a nonelectrolyte? (b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water? (c) Cations are formed by ___ (loss / gain) of electrons. (Choose the correct word to fill in the blanks). (d) What ions must be present in a solution used for electroplating a particular metal?

2527.

(a) What kind of particles will be found in a liquid compound which is a nonelectrolyte? (b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water? (c) Cations are formed by ___ (loss / gain) of electrons. (Choose the correct word to fill in the blanks). (d) What ions must be present in a solution used for electroplating a particular metal?

Answer»

(a) What kind of particles will be found in a liquid compound which is a nonelectrolyte?

(b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?

(c) Cations are formed by ___ (loss / gain) of electrons. (Choose the correct word to fill in the blanks).

(d) What ions must be present in a solution used for electroplating a particular metal?

Discussion

2528.	Question 140(i)Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−tWhat frcation of the substance remains after 7 half-lives?
Answer» Question 140(i) Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression $3^{- t}$ What frcation of the substance remains after 7 half-lives?

2528.

Question 140(i)Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−tWhat frcation of the substance remains after 7 half-lives?

Answer»

Question 140(i)

Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression $3^{- t}$

What frcation of the substance remains after 7 half-lives?

Discussion

2529.	15. what are isoelectronic cations ?
Answer» 15. what are isoelectronic cations ?

Discussion

2530.	Is Bohr's model of an atom partially wrong?
Answer» Is Bohr's model of an atom partially wrong?

Discussion

2531.	Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reaction (a) to (e). Some properties may be repeated.A. AcidB. Dehydrating agentC. Non-volatile acidD. Oxidizing agent(a) C12H22O11 + nH2SO4 → 12C + 11H2O + nH2SO4(b) S + 2H2SO4 → 3SO2 + 2H2O(c) NaCl + 2H2SO4 → NaHSO4 + HCl(d) CuO + 2H2SO4 → CuSO4 + H2O(e) Na2CO3 + H2SO4 → Na2SO4 + H2O + CO2
Answer» Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reaction (a) to (e). Some properties may be repeated. A. Acid B. Dehydrating agent C. Non-volatile acid D. Oxidizing agent (a) C₁₂H₂₂O₁₁ + nH₂SO₄ $\overset{}{\to}$ 12C + 11H₂O + nH₂SO₄ (b) S + 2H₂SO₄ $\overset{}{\to}$ 3SO₂ + 2H₂O (c) NaCl + 2H₂SO₄ $\overset{}{\to}$ NaHSO₄ + HCl (d) CuO + 2H₂SO₄ $\overset{}{\to}$ CuSO₄ + H₂O (e) Na2CO₃ + H₂SO₄ $\overset{}{\to}$ Na₂SO₄ + H₂O + CO₂

Discussion

2532.	29. What is the order of thermal stability and Cl-O bond order of oxy acids of Chlorine?
Answer» 29. What is the order of thermal stability and Cl-O bond order of oxy acids of Chlorine?

Discussion

2533.	Name a non-metal that has a metallic lustre and sublimes on heating.
Answer» Name a non-metal that has a metallic lustre and sublimes on heating.

Discussion

2534.	a sample of gas in a box is at pressure p0 and temperature t0 if the number of molecule is doubled and total kinetic energy of the gas is kept cons†an t the final temperature and pressure will
Answer» a sample of gas in a box is at pressure p0 and temperature t0 if the number of molecule is doubled and total kinetic energy of the gas is kept cons†an t the final temperature and pressure will

Discussion

2535.	What type of fuels : (a) burn with a flame? (b) burn without a flame?
Answer» What type of fuels : (a) burn with a flame? (b) burn without a flame?

Discussion

2536.	Give reasons for the following:(i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water.(ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid.(iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.(iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.(v) Sulphuric acid can form two kinds of salts with sodium chloride.(vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.(vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.(viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid.(ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.(x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory.(xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.(xii) Concentrated sulphuric acid must be stored in airtight bottles.(xiii) Cotton clothes get burnt with concentrated sulphuric acid.(xiv) H2SO4 cannot be prepared by heating sodium sulphate with conc. HCl or HNO3.
Answer» Give reasons for the following: (i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water. (ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid. (iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid. (iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute. (v) Sulphuric acid can form two kinds of salts with sodium chloride. (vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed. (vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed. (viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid. (ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind. (x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory. (xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white. (xii) Concentrated sulphuric acid must be stored in airtight bottles. (xiii) Cotton clothes get burnt with concentrated sulphuric acid. (xiv) H₂SO₄ cannot be prepared by heating sodium sulphate with conc. HCl or HNO₃.

Discussion

2537.	CuS→Cu+SO2 Calculate n-factor of CuS in this Reaction.
Answer» CuS→Cu+SO2 Calculate n-factor of CuS in this Reaction.

Discussion

2538.	Calculate Number of Moles of water present in its 504 ml sample at STP.
Answer» Calculate Number of Moles of water present in its 504 ml sample at STP.

Discussion

2539.	The specific conductivity of 0.02 M KCl solution at 25oC is 2.768×10−3 ohm−1 cm−1.The resistance of this at 25oC when measured with a particular cell was 250.2 ohm. The resistance of 0.01 M CuSO4 solution at 25oC measured with the same cell was 8331 ohm. Calculate the molar conductivity of the copper sulphate solution.
Answer» The specific conductivity of $0.02 M K C l$ solution at $25^{o} C$ is $2.768 \times 10^{- 3} o h m^{- 1} c m^{- 1} .$ The resistance of this at $25^{o} C$ when measured with a particular cell was $250.2 o h m$ . The resistance of $0.01 M C u S O_{4}$ solution at $25^{o} C$ measured with the same cell was $8331 o h m$ . Calculate the molar conductivity of the copper sulphate solution.

Discussion

2540.	12. what is the screening constant for gallium
Answer» 12. what is the screening constant for gallium

Discussion

2541.	what is the value of pkb and kb for (1) C2H5Nh2 (2) (C2H5)2Nh2 (3) (C2H5)3
Answer» what is the value of pkb and kb for (1) C2H5Nh2 (2) (C2H5)2Nh2 (3) (C2H5)3

Discussion

2542.	Two oxides of metal contain 72.4 % and 70% of metal respectively? If formula of 2nd oxide is M2O3 find that of first
Answer» Two oxides of metal contain 72.4 % and 70% of metal respectively? If formula of 2nd oxide is M2O3 find that of first

Discussion

2543.	Why HCL and HNO3 cannot dissolve Gold and Platinum alone but their mixture,Aqua-Regia can?
Answer» Why HCL and HNO₃cannot dissolve Gold and Platinum alone but their mixture,Aqua-Regia can?

Discussion

2544.	What are green plants ?
Answer» What are green plants ?

Discussion

2545.	Which of the following gas is a greenish yellow colour which also bleaches?
Answer» Which of the following gas is a greenish yellow colour which also bleaches?

Discussion

2546.	(a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why?(c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer.(d) What could the elements X and Y be? Write their names and symbols.
Answer» (a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table? (b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why? (c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer. (d) What could the elements X and Y be? Write their names and symbols.

Discussion

2547.	Solubility of gas in liquid depends upon?
Answer» Solubility of gas in liquid depends upon?

Discussion

2548.	Give the name and formulae of one member of each of the following:(a) saturated hydrocarbons.(b) unsaturated hydrocarbons.
Answer» Give the name and formulae of one member of each of the following: (a) saturated hydrocarbons. (b) unsaturated hydrocarbons.

Discussion

2549.	Write the molecular formula and structure formula of ethanol.
Answer» Write the molecular formula and structure formula of ethanol.

Discussion

2550.	28. Why does every hydrocarbon on reacting with oxygen gives water and carbon dioxide
Answer» 28. Why does every hydrocarbon on reacting with oxygen gives water and carbon dioxide

Discussion

Explore topic-wise InterviewSolutions in .

At 37°C and 0.1atm, the mass density of phosphorus vapour is 0.5 g/L. What is the molecular formula of phosphorus (take R=0.08 atm L/mol K)​

Some metallic oxides can be reduced by hydrogen,carbon and carbon monoxide and some cannot.Explain.

Give any two important uses of neutralisation reaction in daily life.

The statement which is not true for the p block elements is:

Sulphur dioxide gas can be formed by:

CaCO3(s)--> CaO(s) + CO2(g) The process will be spontaneous at (1) All temperatures (2) T>△ H/△ S 3) T

Which of the following is the correct molecular formula of Nitric acid?

Which of the following compounds is brown in colour?

18. Ionic conductance of H^+ & SO_4^{2-} are k and y S cm^2 mol^{-1}. Hence equivalent conductivity of H2SO4 is

What is products of Baeyer Villiger oxidation below?

Where is toluene used?

Which of the following can be used as a reducing agent in smelting?

What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur?

Write the formula of co-efficient of range and find its range.

45.Why metal produce hydrogen with water

Four faradays of electricity were passed through AgNo3,cadmium sulphate,aluminum sulphate, lead sulphate kept in four vessels using inert electrodes .The ratio of moles of Ag,Cd,Al,Pb deposited will be

33. Solid ammonium carbamate dissociated according to the given reaction NH2COONH4(s) gives 2NH3(g) + CO2(g) Total pressure of the gases in equilibrium is 5 atm. Hence Kp (1)18.5 (2)25 (3)1/5 (4)12.5

How to determine the central atom when both the atoms are present in same no

What is the solubility of Al(OH)3,(Ksp=1×10−33) in a buffer solution of pH = 4 at room temperature ?

Name the element and the chemical symbol of the alkaline earth metal with the smallest atomic number. What is the number of valence electrons present in it?

Name the compounds required for the laboratory preparation of nitric acid.

The formula of the compound is A2B5 The number of electrons in the outermost orbits of A and B respectively are

Which is more stable fumaric acid or maleic acid

Which of these is the key compound for the laboratory preparation of sulphuric acid?

Question 140(i)Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3−tWhat frcation of the substance remains after 7 half-lives?

15. what are isoelectronic cations ?

Is Bohr's model of an atom partially wrong?

29. What is the order of thermal stability and Cl-O bond order of oxy acids of Chlorine?

Name a non-metal that has a metallic lustre and sublimes on heating.

a sample of gas in a box is at pressure p0 and temperature t0 if the number of molecule is doubled and total kinetic energy of the gas is kept cons†an t the final temperature and pressure will

What type of fuels : (a) burn with a flame? (b) burn without a flame?

CuS→Cu+SO2 Calculate n-factor of CuS in this Reaction.

Calculate Number of Moles of water present in its 504 ml sample at STP.

12. what is the screening constant for gallium

what is the value of pkb and kb for (1) C2H5Nh2 (2) (C2H5)2Nh2 (3) (C2H5)3

Two oxides of metal contain 72.4 % and 70% of metal respectively? If formula of 2nd oxide is M2O3 find that of first

Why HCL and HNO3 cannot dissolve Gold and Platinum alone but their mixture,Aqua-Regia can?

What are green plants ?

Which of the following gas is a greenish yellow colour which also bleaches?

Solubility of gas in liquid depends upon?

Give the name and formulae of one member of each of the following:(a) saturated hydrocarbons.(b) unsaturated hydrocarbons.

Write the molecular formula and structure formula of ethanol.

28. Why does every hydrocarbon on reacting with oxygen gives water and carbon dioxide

At 37°C and 0.1atm, the mass density of phosphorus vapour is 0.5 g/L. What is the molecular formula of phosphorus (take R=0.08 atm L/mol K)