7248 + Interview Questions in Chemistry Page 70 InterviewSolution

3451.	Question 16The quality of air at various locations is monitored regularly by the government and other agencies? In what way can you use these data?
Answer» Question 16 The quality of air at various locations is monitored regularly by the government and other agencies? In what way can you use these data?

Discussion

3452.	What happens when alkyl halides reacts with metals what product we get
Answer» What happens when alkyl halides reacts with metals what product we get

Discussion

3453.	The enthalpy of formation of a compound is equal in magnitude but of opposite sign to the enthalpy of decomposition of the compound under the same conditions. This law was presented by options: a) Hess b)Le-chaleiter c)Kirchoff d) Lavoiser and Laplace
Answer» The enthalpy of formation of a compound is equal in magnitude but of opposite sign to the enthalpy of decomposition of the compound under the same conditions. This law was presented by options: a) Hess b)Le-chaleiter c)Kirchoff d) Lavoiser and Laplace

Discussion

3454.	63. If two compounds are combined then it is pure or impure
Answer» 63. If two compounds are combined then it is pure or impure

Discussion

3455.	Question 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses.
Answer» Question 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses.

Discussion

3456.	Which of the following is correct representation of reaction of iron (III) solution with sulphur dioxide?
Answer» Which of the following is correct representation of reaction of iron (III) solution with sulphur dioxide?

Discussion

3457.	Distilled water is a/an:
Answer» Distilled water is a/an:

Discussion

3458.	Briefly describe the rust cycle. (with diagram)
Answer» Briefly describe the rust cycle. (with diagram)

Discussion

3459.	___ agents are those substances that help another substance get reduced.
Answer» ___ agents are those substances that help another substance get reduced.

Discussion

3460.	What is meant by 'metal is high or low reactive'?
Answer» What is meant by 'metal is high or low reactive'?

Discussion

3461.	Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y.[1 mark]
Answer» Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y. [1 mark]

Discussion

3462.	55. Prove that the difference in energy between 1st and 2nd Bohr orbit for a hydrogen atom is 10.2 eV.
Answer» 55. Prove that the difference in energy between 1st and 2nd Bohr orbit for a hydrogen atom is 10.2 eV.

Discussion

3463.	Consider the following materials : Copper, Sulphur, Phosphorous, Carbon (such as pencil head), Gold, Silver. Which of these materials is:(i) malleable and ductile, and (ii) brittle?
Answer» Consider the following materials : Copper, Sulphur, Phosphorous, Carbon (such as pencil head), Gold, Silver. Which of these materials is:(i) malleable and ductile, and (ii) brittle?

3463.

Consider the following materials : Copper, Sulphur, Phosphorous, Carbon (such as pencil head), Gold, Silver. Which of these materials is:(i) malleable and ductile, and (ii) brittle?

Answer»

Consider the following materials :

Copper, Sulphur, Phosphorous, Carbon (such as pencil head), Gold, Silver.

Which of these materials is:(i) malleable and ductile, and (ii) brittle?

Discussion

3464.	48. Differences. Between rapid combustion and spontaneous combustion
Answer» 48. Differences. Between rapid combustion and spontaneous combustion

Discussion

3465.	Question 2What are oxidising agents?
Answer» Question 2 What are oxidising agents?

Discussion

3466.	Question 7 (a) Explain why the following are made of thermosetting plastics. Saucepan handles.
Answer» Question 7 (a) Explain why the following are made of thermosetting plastics. Saucepan handles.

3466.

Question 7 (a) Explain why the following are made of thermosetting plastics. Saucepan handles.

Answer»

Question 7 (a)
Explain why the following are made of thermosetting plastics.

Saucepan handles.

Discussion

3467.	Write thermochemical equation for the formation ofa)glucose b)NaCl(solid)
Answer» Write thermochemical equation for the formation of a)glucose b)NaCl(solid)

Discussion

3468.	Name a chemical reaction for burning of natural gas?
Answer» Name a chemical reaction for burning of natural gas?

Discussion

3469.	In fractional distillation, oil is heated to about
Answer» In fractional distillation, oil is heated to about

Discussion

3470.	Which of the following packaging materials should be preferred for keeping the environment safe?
Answer» Which of the following packaging materials should be preferred for keeping the environment safe?

Discussion

3471.	Litte Sonu wants a ride on parachute . His father checked the rope of parachute and confirmed it is made of nylon . Why cant we use rayon ropes?
Answer» Litte Sonu wants a ride on parachute . His father checked the rope of parachute and confirmed it is made of nylon . Why cant we use rayon ropes?

Discussion

3472.	what is the formula for potential energy and powers formula
Answer» what is the formula for potential energy and powers formula

Discussion

3473.	6 Balance the redox reaction As2S3+NO3^-2--------AsO4^-+NO+S
Answer» 6 Balance the redox reaction As2S3+NO3^-2--------AsO4^-+NO+S

Discussion

3474.	What is retrograde solubility? (Charcter of gypsum)
Answer» What is retrograde solubility? (Charcter of gypsum)

Discussion

3475.	Two close d vessels of equal volume contain air at 105 kPa, 300 K and are connected througha narrow tube.If one of the vessels is now maintained at 300 Kand other at 400 K. what will be the pressure oin the vessels ?
Answer» Two close d vessels of equal volume contain air at 105 kPa, 300 K and are connected througha narrow tube.If one of the vessels is now maintained at 300 Kand other at 400 K. what will be the pressure oin the vessels ?

Discussion

3476.	Inner surface of a cylindrical shell of lenght L and material thermal conductivity K is kept at constant temprature T1 and outer surface with temprature T2 l,such that T1>T2. Radii of inner n outer surfaces are R and 2R respectivly. If cylinder is replaced by an another cylinder of lenght L/2 and radii of inner and outer surface is R/4 and R respectivly. Then the thermal conductivity becomes 'nK'. If tempratures and heat current (dQ/dt) are same in both condition ,then , find the value of 'n'?
Answer» Inner surface of a cylindrical shell of lenght L and material thermal conductivity K is kept at constant temprature T1 and outer surface with temprature T2 l,such that T1>T2. Radii of inner n outer surfaces are R and 2R respectivly. If cylinder is replaced by an another cylinder of lenght L/2 and radii of inner and outer surface is R/4 and R respectivly. Then the thermal conductivity becomes 'nK'. If tempratures and heat current (dQ/dt) are same in both condition ,then , find the value of 'n'?

Discussion

3477.	Explain law of chemical equivalence
Answer» Explain law of chemical equivalence

Discussion

3478.	What is the principle of soda fire extinguisher
Answer» What is the principle of soda fire extinguisher

Discussion

3479.	Question 4Which of the following is not a way to conserve water?(a) Replace(b) Reduce(c) Reuse(d) Recycle
Answer» Question 4 Which of the following is not a way to conserve water? (a) Replace (b) Reduce (c) Reuse (d) Recycle

Discussion

3480.	Hydrogen chloride is a _____ made of H and Cl ____ .
Answer» Hydrogen chloride is a _____ made of $H$ and $Cl$ ____ .

Discussion

3481.	Discuss the discovery of cathode rays with the help of discharge tube experiment. Also draw the diagram.
Answer» Discuss the discovery of cathode rays with the help of discharge tube experiment. Also draw the diagram.

Discussion

3482.	Give two examples each of : (a) solid fuels (b) liquid fuels, and (c) gaseous fuels.
Answer» Give two examples each of : (a) solid fuels (b) liquid fuels, and (c) gaseous fuels.

Discussion

3483.	What is meant by differential coefficient? How to find it?
Answer» What is meant by differential coefficient? How to find it?

Discussion

3484.	What is the mean of covalent radius?What is the mean of Atomic radius?What is the mean of Ionic radius?What is the mean Var Waal's radius?
Answer» What is the mean of covalent radius? What is the mean of Atomic radius? What is the mean of Ionic radius? What is the mean Var Waal's radius?

Discussion

3485.	Match the following Order of reactionHalf-life period1)1st order reactiona)(ka0)−12) Second order reactionb)0.693k3) Zero order reactionc)a02k
Answer» Match the following $\begin{matrix} Order of reaction & Half-life period 1)1st order reaction & a) (k a_{0})^{- 1} 2) Second order reaction & b) \frac{0.693}{k} 3) Zero order reaction & c) \frac{a_{0}}{2 k} \end{matrix}$

Discussion

3486.	39. Fe2O3 + 2Al ---> Al2O3 + 2Fe Which of the statement about the reaction below are incorrect? (\|) Fe is getting reduced. (\|\|)Al2O3 is getting oxidised (\|\|\|)Al is getting oxidised (4)Fe2O3 is getting reduced
Answer» 39. Fe2O3 + 2Al ---> Al2O3 + 2Fe Which of the statement about the reaction below are incorrect? (\|) Fe is getting reduced. (\|\|)Al2O3 is getting oxidised (\|\|\|)Al is getting oxidised (4)Fe2O3 is getting reduced

Discussion

3487.	Donnez le contraire des adverbes.
Answer» Donnez le contraire des adverbes.

Discussion

3488.	A company requires the best variety of coal for its manufacturing unit. Which one of the following coal would you recommend?
Answer» A company requires the best variety of coal for its manufacturing unit. Which one of the following coal would you recommend?

Discussion

3489.	You are provided with a mixture of salt, sand, oil, and water. Write the steps involved for the separation of salt, sand, and oil from the mixture by giving an activity along with the diagram.
Answer» You are provided with a mixture of salt, sand, oil, and water. Write the steps involved for the separation of salt, sand, and oil from the mixture by giving an activity along with the diagram.

Discussion

3490.	Which is the correct formula for calculation weight percentage of a solution?
Answer» Which is the correct formula for calculation weight percentage of a solution?

Discussion

3491.	If the critical temperature of a gas is 27 ∘C then it's inversion temperature will be:
Answer» If the critical temperature of a gas is $27^{\circ} C$ then it's inversion temperature will be:

Discussion

3492.	Two metallic oxides contain 27.6%and 30% oxygen respectively. If the formula of the first oxide is X304, that of the second will be(1) XO(2) O2(3)X2O5(4)X2O3
Answer» Two metallic oxides contain 27.6%and 30% oxygen respectively. If the formula of the first oxide is X304, that of the second will be(1) XO(2) O2(3)X2O5(4)X2O3

Discussion

3493.	Metal M is a major constituent of steel. On reaction with dilute hydrochloric acid, M releases a gas G which burns with a pop sound along with the formation of a greenish coloured solution C.(ii) Which of the following is the correct formula of solution 'C’?
Answer» Metal M is a major constituent of steel. On reaction with dilute hydrochloric acid, M releases a gas G which burns with a pop sound along with the formation of a greenish coloured solution C. (ii) Which of the following is the correct formula of solution 'C’?

Discussion

3494.	Explainthe process of formation of petroleum.
Answer» Explain the process of formation of petroleum.

Discussion

3495.	Give reasons for the following: a) Iron is used to construct bridges and houses. b) Iron sheets are galvanized before use.
Answer» Give reasons for the following: a) Iron is used to construct bridges and houses. b) Iron sheets are galvanized before use.

3495.

Give reasons for the following: a) Iron is used to construct bridges and houses. b) Iron sheets are galvanized before use.

Answer»

Give reasons for the following:

a) Iron is used to construct bridges and houses.

b) Iron sheets are galvanized before use.

Discussion

3496.	Which metals are extracted by electrolysis and cannot be reduced by CO2 or CO ?
Answer» Which metals are extracted by electrolysis and cannot be reduced by $C O_{2}$ or $C O$ ?

Discussion

3497.	Among the following fuels, which has the least calorific value:CNG, Petrol, Cow Dung Cake, Wood.
Answer» Among the following fuels, which has the least calorific value: CNG, Petrol, Cow Dung Cake, Wood.

3497.

Among the following fuels, which has the least calorific value:CNG, Petrol, Cow Dung Cake, Wood.

Answer»

Among the following fuels, which has the least calorific value:

CNG, Petrol, Cow Dung Cake, Wood.

Discussion

3498.	Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.
Answer» Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.

Discussion

3499.	The specific heat of a gas in a polytropic process is given by
Answer» The specific heat of a gas in a polytropic process is given by

Discussion

3500.	What is a fire extinguisher? What is the substance used in the modern type of fire extinguishers? How is it an improvement over the soda acid-type and the foam-type fire extinguishers?
Answer» What is a fire extinguisher? What is the substance used in the modern type of fire extinguishers? How is it an improvement over the soda acid-type and the foam-type fire extinguishers?

Discussion

Explore topic-wise InterviewSolutions in .

Question 16The quality of air at various locations is monitored regularly by the government and other agencies? In what way can you use these data?

What happens when alkyl halides reacts with metals what product we get

The enthalpy of formation of a compound is equal in magnitude but of opposite sign to the enthalpy of decomposition of the compound under the same conditions. This law was presented by options: a) Hess b)Le-chaleiter c)Kirchoff d) Lavoiser and Laplace

63. If two compounds are combined then it is pure or impure

Question 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses.

Which of the following is correct representation of reaction of iron (III) solution with sulphur dioxide?

Distilled water is a/an:

Briefly describe the rust cycle. (with diagram)

___ agents are those substances that help another substance get reduced.

What is meant by 'metal is high or low reactive'?

Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y.[1 mark]

55. Prove that the difference in energy between 1st and 2nd Bohr orbit for a hydrogen atom is 10.2 eV.

Consider the following materials : Copper, Sulphur, Phosphorous, Carbon (such as pencil head), Gold, Silver. Which of these materials is:(i) malleable and ductile, and (ii) brittle?

48. Differences. Between rapid combustion and spontaneous combustion

Question 2What are oxidising agents?

Question 7 (a) Explain why the following are made of thermosetting plastics. Saucepan handles.

Write thermochemical equation for the formation ofa)glucose b)NaCl(solid)

Name a chemical reaction for burning of natural gas?

In fractional distillation, oil is heated to about

Which of the following packaging materials should be preferred for keeping the environment safe?

Litte Sonu wants a ride on parachute . His father checked the rope of parachute and confirmed it is made of nylon . Why cant we use rayon ropes?

what is the formula for potential energy and powers formula

6 Balance the redox reaction As2S3+NO3^-2--------AsO4^-+NO+S

What is retrograde solubility? (Charcter of gypsum)

Two close d vessels of equal volume contain air at 105 kPa, 300 K and are connected througha narrow tube.If one of the vessels is now maintained at 300 Kand other at 400 K. what will be the pressure oin the vessels ?

Explain law of chemical equivalence

What is the principle of soda fire extinguisher

Question 4Which of the following is not a way to conserve water?(a) Replace(b) Reduce(c) Reuse(d) Recycle

Hydrogen chloride is a _____ made of H and Cl ____ .

Discuss the discovery of cathode rays with the help of discharge tube experiment. Also draw the diagram.

Give two examples each of : (a) solid fuels (b) liquid fuels, and (c) gaseous fuels.

What is meant by differential coefficient? How to find it?

What is the mean of covalent radius?What is the mean of Atomic radius?What is the mean of Ionic radius?What is the mean Var Waal's radius?

Match the following Order of reactionHalf-life period1)1st order reactiona)(ka0)−12) Second order reactionb)0.693k3) Zero order reactionc)a02k

39. Fe2O3 + 2Al ---> Al2O3 + 2Fe Which of the statement about the reaction below are incorrect? (|) Fe is getting reduced. (||)Al2O3 is getting oxidised (|||)Al is getting oxidised (4)Fe2O3 is getting reduced

Donnez le contraire des adverbes.

A company requires the best variety of coal for its manufacturing unit. Which one of the following coal would you recommend?

You are provided with a mixture of salt, sand, oil, and water. Write the steps involved for the separation of salt, sand, and oil from the mixture by giving an activity along with the diagram. ​

Which is the correct formula for calculation weight percentage of a solution?

If the critical temperature of a gas is 27 ∘C then it's inversion temperature will be:

Two metallic oxides contain 27.6%and 30% oxygen respectively. If the formula of the first oxide is X304, that of the second will be(1) XO(2) O2(3)X2O5(4)X2O3

Metal M is a major constituent of steel. On reaction with dilute hydrochloric acid, M releases a gas G which burns with a pop sound along with the formation of a greenish coloured solution C.(ii) Which of the following is the correct formula of solution 'C’?

Explainthe process of formation of petroleum.

Give reasons for the following: a) Iron is used to construct bridges and houses. b) Iron sheets are galvanized before use.

Which metals are extracted by electrolysis and cannot be reduced by CO2 or CO ?

Among the following fuels, which has the least calorific value:CNG, Petrol, Cow Dung Cake, Wood.

Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.

The specific heat of a gas in a polytropic process is given by

What is a fire extinguisher? What is the substance used in the modern type of fire extinguishers? How is it an improvement over the soda acid-type and the foam-type fire extinguishers?

Hydrogen chloride is a _ made of H and Cl .

You are provided with a mixture of salt, sand, oil, and water. Write the steps involved for the separation of salt, sand, and oil from the mixture by giving an activity along with the diagram.