10223 + Interview Questions in Chemistry Page 70 InterviewSolution

3451.	Observing the changes, in which of the following would you say a chemical reaction may be occurring? (i) Heating iodine changes the colour from bluish black to purple. (ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance. (iii) Mixing an acid and a base solution raises the temperature. (iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell.
Answer» Observing the changes, in which of the following would you say a chemical reaction may be occurring? (i) Heating iodine changes the colour from bluish black to purple. (ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance. (iii) Mixing an acid and a base solution raises the temperature. (iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell.

Discussion

3452.	A compound having 22.4L volume completely reacts with 112L oxygen at NTP. Compound is
Answer» A compound having 22.4L volume completely reacts with 112L oxygen at NTP. Compound is

Discussion

3453.	42. At a given instant, N atoms of a radioactive elementemits n alpha particles per second. The half life of he element is
Answer» 42. At a given instant, N atoms of a radioactive elementemits n alpha particles per second. The half life of he element is

Discussion

3454.	difference between molecule and element
Answer» difference between molecule and element

Discussion

3455.	Which of the following will show tindal effect 1 - salt solution 2 - starh solution 3 - milk 4 - copper sulphate solution
Answer» Which of the following will show tindal effect 1 - salt solution 2 - starh solution 3 - milk 4 - copper sulphate solution

3455.

Which of the following will show tindal effect 1 - salt solution 2 - starh solution 3 - milk 4 - copper sulphate solution

Answer»

Which of the following will show tindal effect

1 - salt solution

2 - starh solution

3 - milk

4 - copper sulphate solution

Discussion

3456.	State the colour of the water that has entered round-bottomed flask.
Answer» State the colour of the water that has entered round-bottomed flask.

3456.

State the colour of the water that has entered round-bottomed flask.

Answer»

State the colour of the water that has entered round-bottomed flask.

Discussion

3457.	Convert 22 g of carbon dioxide into mole.
Answer» Convert 22 g of carbon dioxide into mole.

Discussion

3458.	A perfect gas of a given mass is first heated in a smal vessel and then in a large vessel,such that their volume remains unchanged. The P-T curve are a)parabolic with same curvature b)parabolic with different curvature c)linear with same slope d)linear with different lope
Answer» A perfect gas of a given mass is first heated in a smal vessel and then in a large vessel,such that their volume remains unchanged. The P-T curve are a)parabolic with same curvature b)parabolic with different curvature c)linear with same slope d)linear with different lope

Discussion

3459.	how to find R in formula PV=nRT
Answer» how to find R in formula PV=nRT

Discussion

3460.	A good method to separate alum (phitkari) from impure samples is:
Answer» A good method to separate alum (phitkari) from impure samples is:

Discussion

3461.	If you are given some copper sulphate crystals, how would you proceed to prepare its saturated solution at room temperature? Give practical details. How can you show that your solution is really saturated?
Answer» If you are given some copper sulphate crystals, how would you proceed to prepare its saturated solution at room temperature? Give practical details. How can you show that your solution is really saturated?

Discussion

3462.	Which seperation technique do you use to separate glycerine,coconut oil and water?
Answer» Which seperation technique do you use to separate glycerine,coconut oil and water?

Discussion

3463.	When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect? (a) bromine vapour is made of tiny paricles which are moving (b) air is made up of tiny particles which are moving (c) the paricles of bromine are moving but those of air not moving (d) even though bromine vapour is heavier than air, it can move up against gravity
Answer» When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect? (a) bromine vapour is made of tiny paricles which are moving (b) air is made up of tiny particles which are moving (c) the paricles of bromine are moving but those of air not moving (d) even though bromine vapour is heavier than air, it can move up against gravity

3463.

When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect? (a) bromine vapour is made of tiny paricles which are moving (b) air is made up of tiny particles which are moving (c) the paricles of bromine are moving but those of air not moving (d) even though bromine vapour is heavier than air, it can move up against gravity

Answer»

When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

(a) bromine vapour is made of tiny paricles which are moving

(b) air is made up of tiny particles which are moving

(c) the paricles of bromine are moving but those of air not moving

(d) even though bromine vapour is heavier than air, it can move up against gravity

Discussion

3464.	Identify X in the following reaction:Ca(OH)2 (aq)+ 2X → CaCl2 (aq)+ 2H2O (l)
Answer» Identify X in the following reaction: ${Ca(OH)}_{2} (aq) + 2 X$ $\to$ ${CaCl}_{2} (aq) + 2 H_{2} O (l)$

Discussion

3465.	what is % increases in pressure of a gas if decrease in volume of gas is 25% at constant temperature
Answer» what is % increases in pressure of a gas if decrease in volume of gas is 25% at constant temperature

Discussion

3466.	Find the number of hydrogen atoms in 9.033×1023 molecules of water.
Answer» Find the number of hydrogen atoms in $9.033 \times 10^{23}$ molecules of water.

Discussion

3467.	Question 7Which of the following is not a common property of plastics?(a) Non-reactive(b) Light in weight(c) Durable(d) Good conductor of electricity
Answer» Question 7 Which of the following is not a common property of plastics? (a) Non-reactive (b) Light in weight (c) Durable (d) Good conductor of electricity

Discussion

3468.	What is isotopes and isobars?
Answer» What is isotopes and isobars?

Discussion

3469.	The number of elements present in a water molecule are ______.
Answer» The number of elements present in a water molecule are ______.

Discussion

3470.	What are the major differences between homogenous mixture and compound? Even though, they both are uniformly distributed. What are the obsolete features which differentiate both of them?
Answer» What are the major differences between homogenous mixture and compound? Even though, they both are uniformly distributed. What are the obsolete features which differentiate both of them?

Discussion

3471.	18. If solution is 30% by mass what is the mass of solute in 210g of solvent.
Answer» 18. If solution is 30% by mass what is the mass of solute in 210g of solvent.

Discussion

3472.	What is the charge of magnesium in MgCl2?2
Answer» What is the charge of magnesium in $Mg {Cl}_{2}$ ? 2

Discussion

3473.	To make asaturated solution 36 grams of sodium chloride is dissolved in 100 grams of water at 293k .find its concentration
Answer» To make asaturated solution 36 grams of sodium chloride is dissolved in 100 grams of water at 293k .find its concentration

Discussion

3474.	An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C,38.71% and H,9.67%. The empirical formula of the compound would be :
Answer» An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave $C, 38.71 % and H, 9.67 % .$ The empirical formula of the compound would be :

Discussion

3475.	Which of the two will scatter light: soap solution or sugar solution? Why?
Answer» Which of the two will scatter light: soap solution or sugar solution? Why?

Discussion

3476.	Molecules can exist in free state because:
Answer» Molecules can exist in free state because:

Discussion

3477.	Choose the element with correct dot structure?
Answer» Choose the element with correct dot structure?

Discussion

3478.	On a ship sailing in the Pacific ocean, where the temperature is 27 ∘C, a balloon is filled with 2 L air. What will be the volume of the balloon when the ship reaches the Indian ocean where the temperature is 29 ∘C ? (Assume pressure is constant)
Answer» On a ship sailing in the Pacific ocean, where the temperature is 27 $^{\circ}$ C, a balloon is filled with 2 L air. What will be the volume of the balloon when the ship reaches the Indian ocean where the temperature is 29 $^{\circ}$ C ? (Assume pressure is constant)

Discussion

3479.	Consider the following reaction,B and C are[0.77 Mark]
Answer» Consider the following reaction, $B$ and $C$ are [0.77 Mark]

Discussion

3480.	3.F2 + h2o at 313k gives A. HF and O2 B. HOF and HF C. HF and H2O2 D. HF and O3
Answer» 3.F2 + h2o at 313k gives A. HF and O2 B. HOF and HF C. HF and H2O2 D. HF and O3

Discussion

3481.	. When }1F of charge is passed through }1M HCl, volume of hydrogen liberated was }11.35L at }STP . What is the volume of hydrogen liberated when same quantity of } electricity is passed through }1M H_2SO_4
Answer» . When }1F of charge is passed through }1M HCl, volume of hydrogen liberated was }11.35L at }STP . What is the volume of hydrogen liberated when same quantity of } electricity is passed through }1M H_2SO_4

Discussion

3482.	In which reaction of acids is their acidic nature cancelled out to produce a neutral substance? What is the neutral substance called?
Answer» In which reaction of acids is their acidic nature cancelled out to produce a neutral substance? What is the neutral substance called?

Discussion

3483.	Process of gradual mixing of two substances by molecular motion is called ___.
Answer» Process of gradual mixing of two substances by molecular motion is called ___.

Discussion

3484.	Question 6(b)Calculate the molar mass of the following substances:(b) Sulphur molecule, S8
Answer» Question 6(b) Calculate the molar mass of the following substances: (b) Sulphur molecule, $S_{8}$

Discussion

3485.	Question 6 Which of the following has maximum number of atoms? (a) 18g of H2O (b) 18g of O2 (c) 18g of CO2 (d) 18g of CH4
Answer» Question 6 Which of the following has maximum number of atoms? (a) $18 g o f H_{2} O$ (b) $18 g o f O_{2}$ (c) $18 g o f C O_{2}$ (d) $18 g o f C H_{4}$

Discussion

3486.	What is the impact that a body can produce due to the combined effect of mass and velocity called ? What is its unit ?
Answer» What is the impact that a body can produce due to the combined effect of mass and velocity called ? What is its unit ?

Discussion

3487.	If 16 g of oxygen contain 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
Answer» If 16 g of oxygen contain 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.

Discussion

3488.	How to check absolute configuration R And S in cyclic conpounds like 1-bromo,2-methyl cyclobutane
Answer» How to check absolute configuration R And S in cyclic conpounds like 1-bromo,2-methyl cyclobutane

Discussion

3489.	In the reaction, H2S + Cl2 → 2HCl + S; hydrogen sulphide is:
Answer» In the reaction, H₂S + Cl₂ → 2HCl + S; hydrogen sulphide is:

Discussion

3490.	9. If the radius of 3rd orbit of hydrogen is a amstrong than the radius of 2nd orbit of He+ will be?
Answer» 9. If the radius of 3rd orbit of hydrogen is a amstrong than the radius of 2nd orbit of He+ will be?

Discussion

3491.	Which mixture of gases at room temperature does not obey Dalton's law of partial pressure? (1)NO2 and O2 (2)NH3 and HCL (3)CO andCO2 (4)SO2 and SO3
Answer» Which mixture of gases at room temperature does not obey Dalton's law of partial pressure? (1)NO2 and O2 (2)NH3 and HCL (3)CO andCO2 (4)SO2 and SO3

Discussion

3492.	State the postulates of daltons atomic theory ? Describe JJ Thomson experiments on discovery of electrons . List out the characters of anode rays. Describe Rutherford model of an atom Describe the properties of cathode rays State the conclusion drawn by Alpha ray scattering experiment of Rutherford
Answer» State the postulates of daltons atomic theory ? Describe JJ Thomson experiments on discovery of electrons . List out the characters of anode rays. Describe Rutherford model of an atom Describe the properties of cathode rays State the conclusion drawn by Alpha ray scattering experiment of Rutherford

3492.

State the postulates of daltons atomic theory ? Describe JJ Thomson experiments on discovery of electrons . List out the characters of anode rays. Describe Rutherford model of an atom Describe the properties of cathode rays State the conclusion drawn by Alpha ray scattering experiment of Rutherford

Answer»

State the postulates of daltons atomic theory ?

Describe JJ Thomson experiments on discovery of electrons .

List out the characters of anode rays.

Describe Rutherford model of an atom

Describe the properties of cathode rays

State the conclusion drawn by Alpha ray scattering experiment of Rutherford

Discussion

3493.	The drying agent for chlorine gas is _________ .
Answer» The drying agent for chlorine gas is _________ .

Discussion

3494.	Equal moles of hydrogen and oxygen gases are placed in a cointainer with a pin hole through which both can escape . What fraction of the oxygen escapes in the time required for one half of the hydrogen to escape?
Answer» Equal moles of hydrogen and oxygen gases are placed in a cointainer with a pin hole through which both can escape . What fraction of the oxygen escapes in the time required for one half of the hydrogen to escape?

Discussion

3495.	The ionic compound containing Fe3+ and (SO4)2− would have the formula
Answer» The ionic compound containing ${F e}^{3 +}$ and $(S O_{4})^{2 -}$ would have the formula

Discussion

3496.	14. Polar protic and polar aprotic solvents Explain
Answer» 14. Polar protic and polar aprotic solvents Explain

Discussion

3497.	Why compounds are included in pure substances although it contains more than one element,while mixtures are considered pure
Answer» Why compounds are included in pure substances although it contains more than one element,while mixtures are considered pure

Discussion

3498.	If we put a plastic bottle containing 500 ml water in sun on a hot day.Will the water present in the botle evaporate
Answer» If we put a plastic bottle containing 500 ml water in sun on a hot day.Will the water present in the botle evaporate

Discussion

3499.	50 g of 15% (w/w) aqueous sugar solution is provided to a student to make its final concentration 20% (w/w). Which of the following is the correct way to obtain the required solution? (1) Add 3.125 g sugar in the given solution (2e) Add 12.5 g water in the given solution (3) Add 1.25 g sugar to the given solution (4) Add 31.25 g of water to the given solution
Answer» 50 g of 15% (w/w) aqueous sugar solution is provided to a student to make its final concentration 20% (w/w). Which of the following is the correct way to obtain the required solution? (1) Add 3.125 g sugar in the given solution (2e) Add 12.5 g water in the given solution (3) Add 1.25 g sugar to the given solution (4) Add 31.25 g of water to the given solution

Discussion

3500.	Burning of Magnesium ribbon in air is an example of _______ .
Answer» Burning of Magnesium ribbon in air is an example of _______ .

Discussion

Explore topic-wise InterviewSolutions in .

A compound having 22.4L volume completely reacts with 112L oxygen at NTP. Compound is

42. At a given instant, N atoms of a radioactive elementemits n alpha particles per second. The half life of he element is

difference between molecule and element

Which of the following will show tindal effect 1 - salt solution 2 - starh solution 3 - milk 4 - copper sulphate solution

State the colour of the water that has entered round-bottomed flask.

Convert 22 g of carbon dioxide into mole.

A perfect gas of a given mass is first heated in a smal vessel and then in a large vessel,such that their volume remains unchanged. The P-T curve are a)parabolic with same curvature b)parabolic with different curvature c)linear with same slope d)linear with different lope

how to find R in formula PV=nRT

A good method to separate alum (phitkari) from impure samples is:

If you are given some copper sulphate crystals, how would you proceed to prepare its saturated solution at room temperature? Give practical details. How can you show that your solution is really saturated?

Which seperation technique do you use to separate glycerine,coconut oil and water?

Identify X in the following reaction:Ca(OH)2 (aq)+ 2X → CaCl2 (aq)+ 2H2O (l)

what is % increases in pressure of a gas if decrease in volume of gas is 25% at constant temperature

Find the number of hydrogen atoms in 9.033×1023 molecules of water.

Question 7Which of the following is not a common property of plastics?(a) Non-reactive(b) Light in weight(c) Durable(d) Good conductor of electricity

What is isotopes and isobars?

The number of elements present in a water molecule are ______.

What are the major differences between homogenous mixture and compound? Even though, they both are uniformly distributed. What are the obsolete features which differentiate both of them?

18. If solution is 30% by mass what is the mass of solute in 210g of solvent.

What is the charge of magnesium in MgCl2?2

To make asaturated solution 36 grams of sodium chloride is dissolved in 100 grams of water at 293k .find its concentration

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C,38.71% and H,9.67%. The empirical formula of the compound would be :

Which of the two will scatter light: soap solution or sugar solution? Why?

Molecules can exist in free state because:

Choose the element with correct dot structure?

On a ship sailing in the Pacific ocean, where the temperature is 27 ∘C, a balloon is filled with 2 L air. What will be the volume of the balloon when the ship reaches the Indian ocean where the temperature is 29 ∘C ? (Assume pressure is constant)

Consider the following reaction,B and C are[0.77 Mark]

3.F2 + h2o at 313k gives A. HF and O2 B. HOF and HF C. HF and H2O2 D. HF and O3

. When }1F of charge is passed through }1M HCl, volume of hydrogen liberated was }11.35L at }STP . What is the volume of hydrogen liberated when same quantity of } electricity is passed through }1M H_2SO_4

In which reaction of acids is their acidic nature cancelled out to produce a neutral substance? What is the neutral substance called?

Process of gradual mixing of two substances by molecular motion is called ___.

Question 6(b)Calculate the molar mass of the following substances:(b) Sulphur molecule, S8

Question 6 Which of the following has maximum number of atoms? (a) 18g of H2O (b) 18g of O2 (c) 18g of CO2 (d) 18g of CH4

What is the impact that a body can produce due to the combined effect of mass and velocity called ? What is its unit ?

If 16 g of oxygen contain 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.

How to check absolute configuration R And S in cyclic conpounds like 1-bromo,2-methyl cyclobutane

In the reaction, H2S + Cl2 → 2HCl + S; hydrogen sulphide is:

9. If the radius of 3rd orbit of hydrogen is a amstrong than the radius of 2nd orbit of He+ will be?

Which mixture of gases at room temperature does not obey Dalton's law of partial pressure? (1)NO2 and O2 (2)NH3 and HCL (3)CO andCO2 (4)SO2 and SO3

State the postulates of daltons atomic theory ? Describe JJ Thomson experiments on discovery of electrons . List out the characters of anode rays. Describe Rutherford model of an atom Describe the properties of cathode rays State the conclusion drawn by Alpha ray scattering experiment of Rutherford

The drying agent for chlorine gas is _________ .

Equal moles of hydrogen and oxygen gases are placed in a cointainer with a pin hole through which both can escape . What fraction of the oxygen escapes in the time required for one half of the hydrogen to escape?

The ionic compound containing Fe3+ and (SO4)2− would have the formula

14. Polar protic and polar aprotic solvents Explain

Why compounds are included in pure substances although it contains more than one element,while mixtures are considered pure

If we put a plastic bottle containing 500 ml water in sun on a hot day.Will the water present in the botle evaporate

Burning of Magnesium ribbon in air is an example of _______ .