15280 + Interview Questions in Chemistry Page 141 InterviewSolution

7001.	Which of the following can form more than one acidic salt?
Answer» Which of the following can form more than one acidic salt?

Discussion

7002.	ntTwo moles of N2 and two moles of H2 are taken in a closed vessel 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 isn
Answer» ntTwo moles of N2 and two moles of H2 are taken in a closed vessel 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 isn

Discussion

7003.	most oxidising element in periodic table
Answer» most oxidising element in periodic table

Discussion

7004.	18 Two compounds A and B having formula C3H60 are isometric to each other .On mild oxidation A produces a monobasic acid C having molecular formula C3H6O2 .In this reaction B remains unchanged .B reacts with I2 and NaOH to form Idoform .Identify A, B,C and give the relevant chemical equations of the reactions.
Answer» 18 Two compounds A and B having formula C3H60 are isometric to each other .On mild oxidation A produces a monobasic acid C having molecular formula C3H6O2 .In this reaction B remains unchanged .B reacts with I2 and NaOH to form Idoform .Identify A, B,C and give the relevant chemical equations of the reactions.

Discussion

7005.	Which among the following gases have highest fraction of molecules moving with Uavg at 27^° C (1)H_2 (2)N_2 (3)O_{} (4)CO_2
Answer» Which among the following gases have highest fraction of molecules moving with Uavg at 27^° C (1)H_2 (2)N_2 (3)O_{} (4)CO_2

Discussion

7006.	Question 43 (c) A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed
Answer» Question 43 (c) A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed

Discussion

7007.	Write answers to the following questions and explain your answers.a. Explain how the element sodium is monovalent.b. M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphatec. Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.d. What is meant by Unified Atomic Mass.'e. Explain with examples what is meant by a 'mole' of a substance.
Answer» Write answers to the following questions and explain your answers. a. Explain how the element sodium is monovalent. b. M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphate c. Explain the need for a reference atom for atomic mass. Give some information about two reference atoms. d. What is meant by Unified Atomic Mass.' e. Explain with examples what is meant by a 'mole' of a substance.

Discussion

7008.	IF7 is polar or non pola
Answer» IF7 is polar or non pola

Discussion

7009.	48.The pH of .15M solution of HOCL (ka=0.00000096) is
Answer» 48.The pH of .15M solution of HOCL (ka=0.00000096) is

Discussion

7010.	Can ddt be hydrolysed with a strong base to give an acid and then treatment with base yield a precipitate??
Answer» Can ddt be hydrolysed with a strong base to give an acid and then treatment with base yield a precipitate??

Discussion

7011.	How to find He +2 bond order
Answer» How to find He +2 bond order

Discussion

7012.	7. A first order reaction is 50% complete in 30 minutesat 27^° C and in 10 minutes at 47^° C. The reaction rateTHEconstant at 27^° C and the energy of activation of thereaction are respectively(a) k=0.0231 min, E 43.848 kJ mol(b) k 0.017 min, E(c) k=0.0693 min, E = 43.848 kJ mol(d) k 0.0231 min, E 28.92 kJ mol= 52.54 kJ mol
Answer» 7. A first order reaction is 50% complete in 30 minutesat 27^° C and in 10 minutes at 47^° C. The reaction rateTHEconstant at 27^° C and the energy of activation of thereaction are respectively(a) k=0.0231 min, E 43.848 kJ mol(b) k 0.017 min, E(c) k=0.0693 min, E = 43.848 kJ mol(d) k 0.0231 min, E 28.92 kJ mol= 52.54 kJ mol

Discussion

7013.	In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.
Answer» In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

Discussion

7014.

State the property of the metal being utilized in the following: Use of Metal Property Zinc in Galvanization Aluminium in Thermite welding

Answer» State the property of the metal being utilized in the following:

Use of Metal	Property
Zinc in Galvanization
Aluminium in Thermite welding

Discussion

7015.	ntWhat is the contribution of each atom in hexagonally arranged rings in hcp lattice?n ntn
Answer» ntWhat is the contribution of each atom in hexagonally arranged rings in hcp lattice?n ntn

Discussion

7016.	A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O Determine the percentage of oxygen in ammonium nitrate. (O = 16)
Answer» A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH₄NO₃ → N₂O +2H₂O Determine the percentage of oxygen in ammonium nitrate. (O = 16)

7016.

A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O Determine the percentage of oxygen in ammonium nitrate. (O = 16)

Answer»

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

NH₄NO₃ → N₂O +2H₂O

Determine the percentage of oxygen in ammonium nitrate. (O = 16)

Discussion

7017.	Difference between enthalpy of atomisation and enthalpy of sublimation of a solid
Answer» Difference between enthalpy of atomisation and enthalpy of sublimation of a solid

Discussion

7018.	Which of the following is produced when a rod dipped in NH4OH is brought near the mouth of a bottle full of HCl gas?
Answer» Which of the following is produced when a rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas?

Discussion

7019.	In a 7cm diameter pipe water is flowing at the rate of 2m/s.Whate is the flow of water in litre/minute?
Answer» In a 7cm diameter pipe water is flowing at the rate of 2m/s.Whate is the flow of water in litre/minute?

Discussion

7020.	Question 2:Write any three properties of acids.
Answer» Question 2: Write any three properties of acids.

7020.

Question 2:Write any three properties of acids.

Answer»

Question 2:

Write any three properties of acids.

Discussion

7021.	Question 3 (c) Name three elements with filled outermost shells.
Answer» Question 3 (c) Name three elements with filled outermost shells.

Discussion

7022.	The correct IUPAC name of
Answer» The correct IUPAC name of

Discussion

7023.	Q 2/30 At 700 K, the equilibrium constant, Kp, for thereaction 2S03(g)2S02(g)02 (g) is 1.8 x 10-3atm. The value of Kc for the above reaction at the same temperature in moles per litre would be
Answer» Q 2/30 At 700 K, the equilibrium constant, Kp, for thereaction 2S03(g)2S02(g)02 (g) is 1.8 x 10-3atm. The value of Kc for the above reaction at the same temperature in moles per litre would be

Discussion

7024.	Benzene and toluene form nearly ideal solutions. At T = 300 K, the vapor pressures of the pure liquids are, 103 and 32 torr. a) A liquid mxiture is composed of 3 mol toluene and 2 mol benzene. If the pressure over the mixture at 300k is gradually reduced, at what pressure does the first vapor form? b) What is the compostion of the first trace of vapor formed? c) If the pressure is reduced further, what is the composition of the last trace of liquid? d) At what Pressure does the last trace of liquid disappear? e) What will be the pressure, the composition of the liquid, and the composition of the vapor when one mole of the mixture has been vaporized?
Answer» Benzene and toluene form nearly ideal solutions. At T = 300 K, the vapor pressures of the pure liquids are, 103 and 32 torr. a) A liquid mxiture is composed of 3 mol toluene and 2 mol benzene. If the pressure over the mixture at 300k is gradually reduced, at what pressure does the first vapor form? b) What is the compostion of the first trace of vapor formed? c) If the pressure is reduced further, what is the composition of the last trace of liquid? d) At what Pressure does the last trace of liquid disappear? e) What will be the pressure, the composition of the liquid, and the composition of the vapor when one mole of the mixture has been vaporized?

Discussion

7025.	ametalic sphere weighing 3kg in air is held by a string so as to be completely immersed in a liquid of relative density 0.8. the relative density of metallic is 10.the tension in the string i
Answer» ametalic sphere weighing 3kg in air is held by a string so as to be completely immersed in a liquid of relative density 0.8. the relative density of metallic is 10.the tension in the string i

Discussion

7026.	What is the common name of CaSO4.12H2O? Also name the compound from which it is prepared.
Answer» What is the common name of ${CaSO}_{4} . \frac{1}{2} H_{2} O$ ? Also name the compound from which it is prepared.

Discussion

7027.	The mass of a single atom of an element X is 2.65×10−23 g.What could this element be?
Answer» The mass of a single atom of an element X is $2.65 \times 10^{- 23}$ g.What could this element be?

Discussion

7028.	A cylinder contains 6.8g of ammonia gas at stp 1. What is the volume occupied by this gas? 2. How many moles of ammonia are present in the cylinder? 3. How many molecules of ammonia are present in the cylinder?
Answer» A cylinder contains 6.8g of ammonia gas at stp 1. What is the volume occupied by this gas? 2. How many moles of ammonia are present in the cylinder? 3. How many molecules of ammonia are present in the cylinder?

Discussion

7029.	Which of the following reactions best represents lab scale preparation of nitric acid?
Answer» Which of the following reactions best represents lab scale preparation of nitric acid?

Discussion

7030.	Differentiate between:(i) Action on indicators or dry ammonia gas and aqueous ammonia.(ii) Reaction of excess ammonia with chlorine and NH3 with excess chlorine.(iii) Aqueous ferrous and ferric sulphate solution.
Answer» Differentiate between: (i) Action on indicators or dry ammonia gas and aqueous ammonia. (ii) Reaction of excess ammonia with chlorine and NH₃ with excess chlorine. (iii) Aqueous ferrous and ferric sulphate solution.

Discussion

7031.	When 1 L of CO2 is heated with graphite , the volume of the gases collected is 1.5 L at STP , The no.of moles of CO produced is 1. 1/22.42. 1/11.23. 28/22.44. 14/22.4
Answer» When 1 L of CO2 is heated with graphite , the volume of the gases collected is 1.5 L at STP , The no.of moles of CO produced is 1. 1/22.4 2. 1/11.2 3. 28/22.4 4. 14/22.4

Discussion

7032.	The size of iso electronic species F‑ , Ne and Na+ is affected by
Answer» The size of iso electronic species $F^{‑}$ , $N e$ and $N a^{+}$ is affected by

Discussion

7033.	Give the reason for temporary hardness of water.
Answer» Give the reason for temporary hardness of water.

Discussion

7034.	4. 0.40 g of NaOH was added to 1 litre of a buffer solution. Its buffer capacity is found to be 0.06. Its pH change will be ? 0.33 0.17 1.0 0.01
Answer» 4. 0.40 g of NaOH was added to 1 litre of a buffer solution. Its buffer capacity is found to be 0.06. Its pH change will be ? 0.33 0.17 1.0 0.01

Discussion

7035.	44. What is Effect of activation energy on rate of reaction and rate constant
Answer» 44. What is Effect of activation energy on rate of reaction and rate constant

Discussion

7036.	Write the structural formula for pentan-1-oic aicd.
Answer» Write the structural formula for pentan-1-oic aicd.

Discussion

7037.	Question 1 What is ozone and how does it affect any ecosystem?
Answer» Question 1 What is ozone and how does it affect any ecosystem?

Discussion

7038.	why is chemical energy evolved in the form of heat during direct redox reaction?
Answer» why is chemical energy evolved in the form of heat during direct redox reaction?

Discussion

7039.	Give two large scale uses of ammonia.
Answer» Give two large scale uses of ammonia.

Discussion

7040.	Write the molecular formulae of the third and fifth members of homologous series represented by the general formula CnH2n−2.
Answer» Write the molecular formulae of the third and fifth members of homologous series represented by the general formula C_nH_2n₋₂.

Discussion

7041.	Question 3.1Identify the substance that is oxidized and the substance that is reduced in the following reaction:4Na (s)+O2(g)→2Na2O(s)
Answer» Question 3.1 Identify the substance that is oxidized and the substance that is reduced in the following reaction: $4 Na (s) + O_{2} (g) \to 2 {Na}_{2} O(s)$

Discussion

7042.	6. Magnetic moment (spin only) of octahedron complex having CFSE=-0.8 △ o and surrounded by weak field ligands can be: (a)\sqrt{8 BM}(b) \sqrt{15} BM (c) (a) & (b) both(d) None of these
Answer» 6. Magnetic moment (spin only) of octahedron complex having CFSE=-0.8 △ o and surrounded by weak field ligands can be: (a)\sqrt{8 BM}(b) \sqrt{15} BM (c) (a) & (b) both(d) None of these

Discussion

7043.	49.How much will the potential Zn/Zn2+ change if the solution of Zn2+ is diluted 10 times (a) increases by 0.03 V (b) decreases by 0.03 V (c) increases by 0.059 V (d) decreases by 0.059 V
Answer» 49.How much will the potential Zn/Zn2+ change if the solution of Zn2+ is diluted 10 times (a) increases by 0.03 V (b) decreases by 0.03 V (c) increases by 0.059 V (d) decreases by 0.059 V

Discussion

7044.	Is gram molecular mass and molar mass of a molecule are same
Answer» Is gram molecular mass and molar mass of a molecule are same

Discussion

7045.	Empirical formula of a compound is CH2O. If its empirical formula mass is equal to its vapour density. Calculate the molecular formula of the compound.
Answer» Empirical formula of a compound is CH₂O. If its empirical formula mass is equal to its vapour density. Calculate the molecular formula of the compound.

Discussion

7046.	When an aqueous solution of H2SO4 is electrolysed, the product at anode is
Answer» When an aqueous solution of $H_{2} S O_{4}$ is electrolysed, the product at anode is

Discussion

7047.	The metallic character of elements across the period from left to right:
Answer» The metallic character of elements across the period from left to right:

Discussion

7048.	In a first-order reaction, A→B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is:
Answer» In a first-order reaction, $A \to B$ , if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is:

Discussion

7049.	If the no.of water molecules in a 200g sample of water is 6.023*10^24.What is the (%) purity of water sample
Answer» If the no.of water molecules in a 200g sample of water is 6.023*10^24.What is the (%) purity of water sample

Discussion

7050.

Some properties of Sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reactions (i) to (v). Some properties may be repeated : A. Acid B. Dehydrating agent C. Non-volatile acid D. Oxidizing agent (i) C12H22O11+nH2SO4→12C+11H2O+nH2SO4 (ii) S+2H2SO4→3SO2+2H2O (iii) NaCI+H2SO4→NaHSO4+HCI (iv) CuO+H2SO4→CuSO4+H2O (v) 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 reactions (i) to (v). Some properties may be repeated :

A. Acid B. Dehydrating agent

C. Non-volatile acid D. Oxidizing agent

(i) $C_{12} H_{22} O_{11} + n H_{2} S O_{4} \to 12 C + 11 H_{2} O + n H_{2} S O_{4}$

(ii) $S + 2 H_{2} S O_{4} \to 3 S O_{2} + 2 H_{2} O$

(iii) $N a C I + H_{2} S O_{4} \to N a H S O_{4} + H C I$

(iv) $C u O + H_{2} S O_{4} \to C u S O_{4} + H_{2} O$

(v) $N a_{2} C O_{3} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O + C O_{2}$

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following can form more than one acidic salt?

ntTwo moles of N2 and two moles of H2 are taken in a closed vessel 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 isn

most oxidising element in periodic table

Which among the following gases have highest fraction of molecules moving with Uavg at 27^° C (1)H_2 (2)N_2 (3)O_{} (4)CO_2

Question 43 (c) A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed

IF7 is polar or non pola

48.The pH of .15M solution of HOCL (ka=0.00000096) is

Can ddt be hydrolysed with a strong base to give an acid and then treatment with base yield a precipitate??

How to find He +2 bond order

In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

State the property of the metal being utilized in the following: Use of Metal Property Zinc in Galvanization Aluminium in Thermite welding

ntWhat is the contribution of each atom in hexagonally arranged rings in hcp lattice?n ntn

A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP). NH4NO3 → N2O +2H2O Determine the percentage of oxygen in ammonium nitrate. (O = 16)

Difference between enthalpy of atomisation and enthalpy of sublimation of a solid

Which of the following is produced when a rod dipped in NH4OH is brought near the mouth of a bottle full of HCl gas?

In a 7cm diameter pipe water is flowing at the rate of 2m/s.Whate is the flow of water in litre/minute?

Question 2:Write any three properties of acids.

Question 3 (c) Name three elements with filled outermost shells.

The correct IUPAC name of

Q 2/30 At 700 K, the equilibrium constant, Kp, for thereaction 2S03(g)2S02(g)02 (g) is 1.8 x 10-3atm. The value of Kc for the above reaction at the same temperature in moles per litre would be

ametalic sphere weighing 3kg in air is held by a string so as to be completely immersed in a liquid of relative density 0.8. the relative density of metallic is 10.the tension in the string i

What is the common name of CaSO4.12H2O? Also name the compound from which it is prepared.

The mass of a single atom of an element X is 2.65×10−23 g.What could this element be?

A cylinder contains 6.8g of ammonia gas at stp 1. What is the volume occupied by this gas? 2. How many moles of ammonia are present in the cylinder? 3. How many molecules of ammonia are present in the cylinder?

Which of the following reactions best represents lab scale preparation of nitric acid?

Differentiate between:(i) Action on indicators or dry ammonia gas and aqueous ammonia.(ii) Reaction of excess ammonia with chlorine and NH3 with excess chlorine.(iii) Aqueous ferrous and ferric sulphate solution.

When 1 L of CO2 is heated with graphite , the volume of the gases collected is 1.5 L at STP , The no.of moles of CO produced is 1. 1/22.42. 1/11.23. 28/22.44. 14/22.4

The size of iso electronic species F‑ , Ne and Na+ is affected by

Give the reason for temporary hardness of water.

4. 0.40 g of NaOH was added to 1 litre of a buffer solution. Its buffer capacity is found to be 0.06. Its pH change will be ? 0.33 0.17 1.0 0.01

44. What is Effect of activation energy on rate of reaction and rate constant

Write the structural formula for pentan-1-oic aicd.

Question 1 What is ozone and how does it affect any ecosystem?

why is chemical energy evolved in the form of heat during direct redox reaction?

Give two large scale uses of ammonia.

Write the molecular formulae of the third and fifth members of homologous series represented by the general formula CnH2n−2.

Question 3.1Identify the substance that is oxidized and the substance that is reduced in the following reaction:4Na (s)+O2(g)→2Na2O(s)

6. Magnetic moment (spin only) of octahedron complex having CFSE=-0.8 △ o and surrounded by weak field ligands can be: (a)\sqrt{8 BM}(b) \sqrt{15} BM (c) (a) & (b) both(d) None of these

49.How much will the potential Zn/Zn2+ change if the solution of Zn2+ is diluted 10 times (a) increases by 0.03 V (b) decreases by 0.03 V (c) increases by 0.059 V (d) decreases by 0.059 V

Is gram molecular mass and molar mass of a molecule are same

Empirical formula of a compound is CH2O. If its empirical formula mass is equal to its vapour density. Calculate the molecular formula of the compound.

When an aqueous solution of H2SO4 is electrolysed, the product at anode is

The metallic character of elements across the period from left to right:

In a first-order reaction, A→B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is:

If the no.of water molecules in a 200g sample of water is 6.023*10^24.What is the (%) purity of water sample