10223 + Interview Questions in Chemistry Page 54 InterviewSolution

2651.	What is appropriate voltage to create cathode ray in discharge tube?
Answer» What is appropriate voltage to create cathode ray in discharge tube?

Discussion

2652.	The work done in an open vessel at 300K when 112g of iron reacts with dil Hcl (In calories )?
Answer» The work done in an open vessel at 300K when 112g of iron reacts with dil Hcl (In calories )?

Discussion

2653.	A student prepared solution of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since, both the solutions are colourless, how will she distinguish between the two ?
Answer» A student prepared solution of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since, both the solutions are colourless, how will she distinguish between the two ?

Discussion

2654.	What is the geometry of NH3 molecule?
Answer» What is the geometry of NH3 molecule?

Discussion

2655.	Ammonium chloride undergoes dissociation to produce ______ and _____ ions.
Answer» Ammonium chloride undergoes dissociation to produce ______ and _____ ions.

Discussion

2656.	Bond formed by mutual sharing of electronics is called as
Answer» Bond formed by mutual sharing of electronics is called as

Discussion

2657.	(a) Name the process by which common salt is obtained from sea-water. (b) Name the process by which common salt is purified.
Answer» (a) Name the process by which common salt is obtained from sea-water. (b) Name the process by which common salt is purified.

2657.

(a) Name the process by which common salt is obtained from sea-water. (b) Name the process by which common salt is purified.

Answer»

(a) Name the process by which common salt is obtained from sea-water.

(b) Name the process by which common salt is purified.

Discussion

2658.	Q 22/40 A sample of nitrogen occupies a volume of 350 cm3 at STPThen, its volume at 550 K and 0.5 bar pressure is approximately
Answer» Q 22/40 A sample of nitrogen occupies a volume of 350 cm3 at STPThen, its volume at 550 K and 0.5 bar pressure is approximately

Discussion

2659.	Is the equation: Na + H2O → NaOH + H2 balanced? Why?
Answer» Is the equation: Na + H₂O → NaOH + H₂ balanced? Why?

Discussion

2660.	Drive formula of centre of mass of solid hemisphere by using polar coordinates
Answer» Drive formula of centre of mass of solid hemisphere by using polar coordinates

Discussion

2661.	Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be
Answer» Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

Discussion

2662.	8.5 g of H2O2 is present in 560 ml of solution .The solution is called as (1)20 volume solution (2)30 volume solution (3)5 volume solution (4)15 volume solutio
Answer» 8.5 g of H2O2 is present in 560 ml of solution .The solution is called as (1)20 volume solution (2)30 volume solution (3)5 volume solution (4)15 volume solutio

Discussion

2663.	A boy poured 20 gram of salt into 200 ml of water in a beaker. Then he stirred the water to resolve the salt completely. Then he heated the solution until it was reduced to half. How many grams of salt can be recovered from the remaining solution ?
Answer» A boy poured 20 gram of salt into 200 ml of water in a beaker. Then he stirred the water to resolve the salt completely. Then he heated the solution until it was reduced to half. How many grams of salt can be recovered from the remaining solution ?

Discussion

2664.	Following reactions occur at cathode during electrolysis of aqueous silver chloride solution Ag+(aq) + e` Ag(s) Eo=+0.80V H+(aq) + e` H2(g) Eo= 0.00V On the basis of their standard reduction electrode potential values, which reaction is feasible at cathode and why?
Answer» Following reactions occur at cathode during electrolysis of aqueous silver chloride solution Ag+(aq) + e` Ag(s) Eo=+0.80V H+(aq) + e` H2(g) Eo= 0.00V On the basis of their standard reduction electrode potential values, which reaction is feasible at cathode and why?

Discussion

2665.	A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromne vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student ? Give reason for your answer.
Answer» A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromne vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student ? Give reason for your answer.

Discussion

2666.	The capacity of M shell is 18, then why does M shell of calcium has 8 electrons though it's atomic number is 20
Answer» The capacity of M shell is 18, then why does M shell of calcium has 8 electrons though it's atomic number is 20

Discussion

2667.	Which of the following sets includes only transition elements?
Answer» Which of the following sets includes only transition elements?

Discussion

2668.	Resistance of 0.2 M solution of an electrolyte is 50Ω.The specific conductance of the solution is 1.4 Sm−1. The resistance of 0.5 M solution of the same electrolyte is 280Ω. The molar conductivity of 0.5 M solution of the electrolyte in Sm2mol−1 is
Answer» Resistance of 0.2 M solution of an electrolyte is $50 Ω$ .The specific conductance of the solution is $1.4 S m^{- 1}$ . The resistance of 0.5 M solution of the same electrolyte is $280 Ω$ . The molar conductivity of 0.5 M solution of the electrolyte in $S m^{2} m o l^{- 1}$ is

Discussion

2669.	What is mole? what is its features?
Answer» What is mole? what is its features?

Discussion

2670.	2814Si and 2914Si are _______ .
Answer» ²⁸₁₄Si and ²⁹₁₄Si are _______ .

Discussion

2671.	A student has two samples A and B. A fresh solution of FeSO4 was added to both the samples. After shaking both the samples well, a compound X was added. It was seen that in sample A a brown ring was formed but in the sample, B no brown ring is formed. Which of the following options could be A, B and X?
Answer» A student has two samples A and B. A fresh solution of $F e S O_{4}$ was added to both the samples. After shaking both the samples well, a compound X was added. It was seen that in sample A a brown ring was formed but in the sample, B no brown ring is formed. Which of the following options could be A, B and X?

Discussion

2672.	What is the meaning of salt solution in displacement reaction ?
Answer» What is the meaning of salt solution in displacement reaction ?

Discussion

2673.	Analyze the given reaction below:2H2O2(l)MnO2⟶2H2O(l)+O2(g)Which component will be left after the completion of the reaction?
Answer» Analyze the given reaction below: $2 H_{2} O_{2} (l) M n O_{2} ⟶ 2 H_{2} O (l) + O_{2} (g)$ Which component will be left after the completion of the reaction?

Discussion

2674.	40. 50ml H2O is added to a 50ml solution of Ba(OH)2 of strenth 0.01M. The pH value of the resuultingsolution will be
Answer» 40. 50ml H2O is added to a 50ml solution of Ba(OH)2 of strenth 0.01M. The pH value of the resuultingsolution will be

Discussion

2675.	Question 3 (b)Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).b. Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.
Answer» Question 3 (b) Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution). b. Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Discussion

2676.	Explain the following in terms of gain or loss of oxygen with two examples each: (A) Reduction.(B) Oxidation. [3 Marks]
Answer» Explain the following in terms of gain or loss of oxygen with two examples each: (A) Reduction. (B) Oxidation. [3 Marks]

Discussion

2677.	Why acetylene is used in welding process
Answer» Why acetylene is used in welding process

Discussion

2678.	Spin only magnetic moment of Ni in [Ni(dmg)2] is same as that founds in :
Answer» Spin only magnetic moment of $N i$ in $[N i (d m g)_{2}]$ is same as that founds in :

Discussion

2679.	The unbalanced equation is
Answer» The unbalanced equation is

Discussion

2680.	Why metals at the top of the reactivity series are never found as free elements.
Answer» Why metals at the top of the reactivity series are never found as free elements.

Discussion

2681.	39. 1 mol of solid Zn is placed in excess of dilute sulphuric acid at 27C temperature,in a cylinder fitted with piston . The heat given to a surrounding is 36.5kj . The value of change in internal energy for the process if area of piston is 500cm square of 1atm during reaction Zn(s) + 2H+ = Zn2+(aq) + H2(g)
Answer» 39. 1 mol of solid Zn is placed in excess of dilute sulphuric acid at 27C temperature,in a cylinder fitted with piston . The heat given to a surrounding is 36.5kj . The value of change in internal energy for the process if area of piston is 500cm square of 1atm during reaction Zn(s) + 2H+ = Zn2+(aq) + H2(g)

Discussion

2682.	How many mol of C atoms are present in 4×10−3 mol of glucose?
Answer» How many mol of C atoms are present in $4 \times 10^{- 3}$ mol of glucose?

Discussion

2683.	Silver nitrate is very soluble in water. 1. If one gram of silver nitrate is added in 9 ml of water the volume of solution is 9. 2 ml 2. if 2 gram of silver nitrate is added in 8 ml of water then the volume of solution is 8. 4 ml 3. Is 3 gram of silver nitrate is added in 7 ml of water when the volume of solution in 7. 6 ml. according to the volumes of the solution obtained by dissolving various masses of silver nitrate in various volumes of water at room temperature find Q 25 gram of silver nitrate when dissolved in 50 ml of water what would be the final volume
Answer» Silver nitrate is very soluble in water. 1. If one gram of silver nitrate is added in 9 ml of water the volume of solution is 9. 2 ml 2. if 2 gram of silver nitrate is added in 8 ml of water then the volume of solution is 8. 4 ml 3. Is 3 gram of silver nitrate is added in 7 ml of water when the volume of solution in 7. 6 ml. according to the volumes of the solution obtained by dissolving various masses of silver nitrate in various volumes of water at room temperature find Q 25 gram of silver nitrate when dissolved in 50 ml of water what would be the final volume

Discussion

2684.	Explain redox reactions using an example.
Answer» Explain redox reactions using an example.

Discussion

2685.	How was the Quantum Mechanical model able to explain the stark and zeeman effect?
Answer» How was the Quantum Mechanical model able to explain the stark and zeeman effect?

Discussion

2686.	CaC2+2D2O→C2D2+Ca(OD)2 ...(i)SO3+D2O→D2SO4 ...(ii)Al4C3+12D2O→3CD4+4Al(OD)3 ...(iii)C2D2+O2→CO2+D2O ...(iv)CD4+O2→CO2+D2O ...(v)If CaC2,SO3&Al4C3 are taken in 3:2:1 molar ratio and hydrocarbon obtained is further treated with O2. Then the ratio of mass of D2O consumed in the first three steps to the mass of D2O formed in last two steps are
Answer» $C a C_{2} + 2 D_{2} O \to C_{2} D_{2} + C a (O D)_{2}$ ...(i) $S O_{3} + D_{2} O \to D_{2} S O_{4}$ ...(ii) $A l_{4} C_{3} + 12 D_{2} O \to 3 C D_{4} + 4 A l (O D)_{3}$ ...(iii) $C_{2} D_{2} + O_{2} \to C O_{2} + D_{2} O$ ...(iv) $C D_{4} + O_{2} \to C O_{2} + D_{2} O$ ...(v) If $C a C_{2}, S O_{3} & A l_{4} C_{3}$ are taken in $3 : 2 : 1$ molar ratio and hydrocarbon obtained is further treated with $O_{2}$ . Then the ratio of mass of $D_{2} O$ consumed in the first three steps to the mass of $D_{2} O$ formed in last two steps are

Discussion

2687.	Which are the basic states of matter
Answer» Which are the basic states of matter

Discussion

2688.	21. The rate of effusion of hydrogen gas at 880 torr and at 227^° c is 8 torr min -1 .What will be the rate of effusion of oxygen gas at a pressure of 1760 torr and at 227^° c ?
Answer» 21. The rate of effusion of hydrogen gas at 880 torr and at 227^° c is 8 torr min -1 .What will be the rate of effusion of oxygen gas at a pressure of 1760 torr and at 227^° c ?

Discussion

2689.	1g of monobasic acid in 100g of water lowers the freezing point by 0.168^°.if 0.2g of the same acid requires 15mL of N/10 alkali for complete neutralisation, what will be the degree of dissociation of the acid(kf =1.86K kg/mol) ?
Answer» 1g of monobasic acid in 100g of water lowers the freezing point by 0.168^°.if 0.2g of the same acid requires 15mL of N/10 alkali for complete neutralisation, what will be the degree of dissociation of the acid(kf =1.86K kg/mol) ?

Discussion

2690.	Write the relation between Kelvin scale and Celsius scale of temperature.
Answer» Write the relation between Kelvin scale and Celsius scale of temperature.

Discussion

2691.	52. During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294gm/ml sulphuric acid of density 1.294gm/ml is 39%H2SO4 by wieght and that of density 1.139gm/ml is 20% by wieght the battery holds 3.5 litre of the acid and the volume remained practically constant during the discharge. Calculate the number of ampere -hours for which the battery must have been used.
Answer» 52. During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294gm/ml sulphuric acid of density 1.294gm/ml is 39%H2SO4 by wieght and that of density 1.139gm/ml is 20% by wieght the battery holds 3.5 litre of the acid and the volume remained practically constant during the discharge. Calculate the number of ampere -hours for which the battery must have been used.

Discussion

2692.	As we increase the temperature, the rate of diffusion _________.
Answer» As we increase the temperature, the rate of diffusion _________.

Discussion

2693.	What is the contribution of the following in Atomic structure? (a) Maharshi Kanada (b) Democritus
Answer» What is the contribution of the following in Atomic structure? (a) Maharshi Kanada (b) Democritus

2693.

What is the contribution of the following in Atomic structure? (a) Maharshi Kanada (b) Democritus

Answer»

What is the contribution of the following in Atomic structure?

(a) Maharshi Kanada

(b) Democritus

Discussion

2694.	2 litres of a gas is enclosed in a vessel at a pressure of 760 mm Hg. If tempreature remains constant, calculate pressure when volume changes to 4 dm3
Answer» 2 litres of a gas is enclosed in a vessel at a pressure of 760 mm Hg. If tempreature remains constant, calculate pressure when volume changes to 4 $d m^{3}$

Discussion

2695.	Dalton's Atomic Theory was able to explain
Answer» Dalton's Atomic Theory was able to explain

Discussion

2696.	What is the use of glass ball in the distillation process?
Answer» What is the use of glass ball in the distillation process?

Discussion

2697.	A gas absorbs photons of 355nm and emits two wavelength If one of the emission is at 680nm then other is at
Answer» A gas absorbs photons of 355nm and emits two wavelength If one of the emission is at 680nm then other is at

Discussion

2698.	The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food, we have to go close. Why?
Answer» The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food, we have to go close. Why?

Discussion

2699.	Question 19Complete the following table.
Answer» Question 19 Complete the following table.

2699.

Question 19Complete the following table.

Answer»

Question 19
Complete the following table.

Discussion

2700.	What is hybrid-orbitals?
Answer» What is hybrid-orbitals?

Discussion

Explore topic-wise InterviewSolutions in .

What is appropriate voltage to create cathode ray in discharge tube?

The work done in an open vessel at 300K when 112g of iron reacts with dil Hcl (In calories )?

A student prepared solution of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since, both the solutions are colourless, how will she distinguish between the two ?

What is the geometry of NH3 molecule?

Ammonium chloride undergoes dissociation to produce ______ and _____ ions.

Bond formed by mutual sharing of electronics is called as

(a) Name the process by which common salt is obtained from sea-water. (b) Name the process by which common salt is purified.

Q 22/40 A sample of nitrogen occupies a volume of 350 cm3 at STPThen, its volume at 550 K and 0.5 bar pressure is approximately

Is the equation: Na + H2O → NaOH + H2 balanced? Why?

Drive formula of centre of mass of solid hemisphere by using polar coordinates

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

8.5 g of H2O2 is present in 560 ml of solution .The solution is called as (1)20 volume solution (2)30 volume solution (3)5 volume solution (4)15 volume solutio

A boy poured 20 gram of salt into 200 ml of water in a beaker. Then he stirred the water to resolve the salt completely. Then he heated the solution until it was reduced to half. How many grams of salt can be recovered from the remaining solution ?

Following reactions occur at cathode during electrolysis of aqueous silver chloride solution Ag+(aq) + e` Ag(s) Eo=+0.80V H+(aq) + e` H2(g) Eo= 0.00V On the basis of their standard reduction electrode potential values, which reaction is feasible at cathode and why?

The capacity of M shell is 18, then why does M shell of calcium has 8 electrons though it's atomic number is 20

Which of the following sets includes only transition elements?

Resistance of 0.2 M solution of an electrolyte is 50Ω.The specific conductance of the solution is 1.4 Sm−1. The resistance of 0.5 M solution of the same electrolyte is 280Ω. The molar conductivity of 0.5 M solution of the electrolyte in Sm2mol−1 is

What is mole? what is its features?

2814Si and 2914Si are _______ .

What is the meaning of salt solution in displacement reaction ?

Analyze the given reaction below:2H2O2(l)MnO2⟶2H2O(l)+O2(g)Which component will be left after the completion of the reaction?

40. 50ml H2O is added to a 50ml solution of Ba(OH)2 of strenth 0.01M. The pH value of the resuultingsolution will be

Explain the following in terms of gain or loss of oxygen with two examples each: (A) Reduction.(B) Oxidation. [3 Marks]

Why acetylene is used in welding process

Spin only magnetic moment of Ni in [Ni(dmg)2] is same as that founds in :

The unbalanced equation is

Why metals at the top of the reactivity series are never found as free elements.

How many mol of C atoms are present in 4×10−3 mol of glucose?

Explain redox reactions using an example.

How was the Quantum Mechanical model able to explain the stark and zeeman effect?

Which are the basic states of matter

21. The rate of effusion of hydrogen gas at 880 torr and at 227^° c is 8 torr min -1 .What will be the rate of effusion of oxygen gas at a pressure of 1760 torr and at 227^° c ?

1g of monobasic acid in 100g of water lowers the freezing point by 0.168^°.if 0.2g of the same acid requires 15mL of N/10 alkali for complete neutralisation, what will be the degree of dissociation of the acid(kf =1.86K kg/mol) ?

Write the relation between Kelvin scale and Celsius scale of temperature.

As we increase the temperature, the rate of diffusion _________.

What is the contribution of the following in Atomic structure? (a) Maharshi Kanada (b) Democritus

2 litres of a gas is enclosed in a vessel at a pressure of 760 mm Hg. If tempreature remains constant, calculate pressure when volume changes to 4 dm3

Dalton's Atomic Theory was able to explain

What is the use of glass ball in the distillation process?

A gas absorbs photons of 355nm and emits two wavelength If one of the emission is at 680nm then other is at

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food, we have to go close. Why?

Question 19Complete the following table.

What is hybrid-orbitals?

Ammonium chloride undergoes dissociation to produce __ and _ ions.