7248 + Interview Questions in Chemistry Page 76 InterviewSolution

3751.	write any three differences between displacement and double displacement reactions
Answer» write any three differences between displacement and double displacement reactions

Discussion

3752.	Show that the circumference of bohr's orbit for hydrogen atom is an integral multiple of the de Broglie's wavelength associated with the electron revolving around the orbit.
Answer» Show that the circumference of bohr's orbit for hydrogen atom is an integral multiple of the de Broglie's wavelength associated with the electron revolving around the orbit.

Discussion

3753.	In a reversible chemical change, the reverse reaction is releasing heat energy in surrounding. The forward reaction must have been ______________
Answer» In a reversible chemical change, the reverse reaction is releasing heat energy in surrounding. The forward reaction must have been ______________

Discussion

3754.	How are mangoes preserved as pickles?
Answer» How are mangoes preserved as pickles?

Discussion

3755.	Which of these is used as a solvent for dry cleaning?
Answer» Which of these is used as a solvent for dry cleaning?

Discussion

3756.	Why the maximum covalency of phosphorus is 6 but I find the maximum covalency of phosphorus is 5.
Answer» Why the maximum covalency of phosphorus is 6 but I find the maximum covalency of phosphorus is 5.

Discussion

3757.	How can the hardness of water be removed by boiling?
Answer» How can the hardness of water be removed by boiling?

Discussion

3758.	Mention the conditions in which a solute becomes solvent and solvent becomes solute.
Answer» Mention the conditions in which a solute becomes solvent and solvent becomes solute.

Discussion

3759.	Air is an example of ______________.
Answer» Air is an example of ______________.

Discussion

3760.	Question 3(iii)Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows:MetalIron(II)sulphateCooper(II)sulphateZinc sulphateSilver nitrateA.No reactionDisplacementB.DisplacementNo reactionC.No reactionNo reactionNo reactionDisplacementD.No reactionNo reactionNo reactionNo reactionUse the Table above to answer the following questions about metals A, B, C and D.(iii) Arrange the metals A, B, C and D in the decreasing order of reactivity.
Answer» Question 3(iii) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: $\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}$ Use the Table above to answer the following questions about metals A, B, C and D. (iii) Arrange the metals A, B, C and D in the decreasing order of reactivity.

Discussion

3761.	Explain about metals and nonmetals important points from basics
Answer» Explain about metals and nonmetals important points from basics

Discussion

3762.	what is the formula of methanamide
Answer» what is the formula of methanamide

Discussion

3763.	What will happen if heat is provided to pure oxygen?
Answer» What will happen if heat is provided to pure oxygen?

Discussion

3764.	30. What is the Oxidation product of hexan-3-one using selenium dioxide?
Answer» 30. What is the Oxidation product of hexan-3-one using selenium dioxide?

Discussion

3765.	What is balancing an equation? Give detailed examples
Answer» What is balancing an equation? Give detailed examples

Discussion

3766.	How much energy would be needed to heat 450 grams of copper metal from a temperature of 35.0ºC to a temperature of 85.0ºC? The specific heat of metal at 35.0ºC is 0.385 J/g ºC.
Answer» How much energy would be needed to heat 450 grams of copper metal from a temperature of 35.0ºC to a temperature of 85.0ºC? The specific heat of metal at 35.0ºC is 0.385 J/g ºC.

Discussion

3767.	Is Alloy an Homogeneous mixture?
Answer» Is Alloy an Homogeneous mixture?

Discussion

3768.	What do you meant by "matter is not continuous"
Answer» What do you meant by "matter is not continuous"

Discussion

3769.	under the same condition heats of formation of water and co2 are -285 and -394kj/mol respectively. the heat of formation of combustion of methane is -890 kj/mol. the heat of formation of methane is1)-9642)-8903)-2224)-74
Answer» under the same condition heats of formation of water and co2 are -285 and -394kj/mol respectively. the heat of formation of combustion of methane is -890 kj/mol. the heat of formation of methane is 1)-964 2)-890 3)-222 4)-74

Discussion

3770.	Why do rotten egg float ?
Answer» Why do rotten egg float ?

Discussion

3771.	Explain the following in terms of gain of oxygen with two examples each.(a) Oxidation(b) Reduction
Answer» Explain the following in terms of gain of oxygen with two examples each. (a) Oxidation (b) Reduction

Discussion

3772.	Question 4What is the 5 R principle?
Answer» Question 4 What is the 5 R principle?

3772.

Question 4What is the 5 R principle?

Answer»

Question 4

What is the 5 R principle?

Discussion

3773.	Silver foil is used for wrapping food. Which property of silver is used for this?
Answer» Silver foil is used for wrapping food. Which property of silver is used for this?

Discussion

3774.	What should be done to conserve and suatian resource development
Answer» What should be done to conserve and suatian resource development

Discussion

3775.	Whats is oleic acid?
Answer» Whats is oleic acid?

Discussion

3776.	Discuss bleaching action of chlorine.
Answer» Discuss bleaching action of chlorine.

Discussion

3777.	Which of the following is a metal?
Answer» Which of the following is a metal?

Discussion

3778.	Electrical wires have plastic coating as:
Answer» Electrical wires have plastic coating as:

Discussion

3779.	Solar energy is an inexhaustible natural resource because:
Answer» Solar energy is an inexhaustible natural resource because:

Discussion

3780.	Alex had two solutions: X and Y. He added a few drops of turmeric water in solution X and observed that the solution X turned yellow in colour. On adding turmeric water to solution Y, he observed that the solution turned red in colour. From the options given below, identify the solutions that match Alex’s observations.[0.8 mark]
Answer» Alex had two solutions: X and Y. He added a few drops of turmeric water in solution X and observed that the solution X turned yellow in colour. On adding turmeric water to solution Y, he observed that the solution turned red in colour. From the options given below, identify the solutions that match Alex’s observations. [0.8 mark]

Discussion

3781.	Why amorphous solids are isotropic in nature
Answer» Why amorphous solids are isotropic in nature

Discussion

3782.	Due to a change in which of the following properties matter can change from one state to another?
Answer» Due to a change in which of the following properties matter can change from one state to another?

Discussion

3783.	29.The EMF of a chemical cell is positive when free energy change of reaction . (A)>0 (B) =0 (C)
Answer» 29.The EMF of a chemical cell is positive when free energy change of reaction . (A)>0 (B) =0 (C) <0 (D) no relationship between free energy and EMF

Discussion

3784.	75.Under identical condition of pressure and temperature 9.9ml of diatomic gasX2 and 3.3ml of diatomic gas Y2 react completely to produce 6.6ml of gaseous product molecular formula of product would be X3Y XY X2Y XY3
Answer» 75.Under identical condition of pressure and temperature 9.9ml of diatomic gasX2 and 3.3ml of diatomic gas Y2 react completely to produce 6.6ml of gaseous product molecular formula of product would be X3Y XY X2Y XY3

Discussion

3785.	An organic compound has composition given as N=46.66%, C=20%, H=6.66%, o=26.6%. Determine, its empirical formula as well as molecular formula
Answer» An organic compound has composition given as N=46.66%, C=20%, H=6.66%, o=26.6%. Determine, its empirical formula as well as molecular formula

Discussion

3786.	(1)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(2)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(3)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(4)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.
Answer» (1) In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II. (2) In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II. (3) In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II. (4) In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II.

3786.

(1)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(2)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(3)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.(4)In the boxes of Column I the letters of some words got jumbled.Arrange them in proper form in the boxes given in Column II.

Answer» (1)

In the boxes of Column I the letters of some words got jumbled.

Arrange them in proper form in the boxes given in Column II.

(2)

In the boxes of Column I the letters of some words got jumbled.

Arrange them in proper form in the boxes given in Column II.

(3)

In the boxes of Column I the letters of some words got jumbled.

Arrange them in proper form in the boxes given in Column II.

(4)

In the boxes of Column I the letters of some words got jumbled.

Arrange them in proper form in the boxes given in Column II.

Discussion

3787.	Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by him.
Answer» Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by him.

Discussion

3788.	Match the following for the flame of a candle.
Answer» Match the following for the flame of a candle.

Discussion

3789.	4.Do non-metals show photoelectric effect? And what about liquid n gases?
Answer» 4.Do non-metals show photoelectric effect? And what about liquid n gases?

Discussion

3790.	14. 20ml sample of 0.2M solution of weak diprotic acid H2A is treated with o.2M NaOH . Molarity of solution of 2nd equivalent point is
Answer» 14. 20ml sample of 0.2M solution of weak diprotic acid H2A is treated with o.2M NaOH . Molarity of solution of 2nd equivalent point is

Discussion

3791.	Select the method used for water purification.
Answer» Select the method used for water purification.

Discussion

3792.	Iron isreactive than copper.
Answer» Iron isreactive than copper.

Discussion

3793.	63. What do we mean when we say that electron has NEGATIVE charge?
Answer» 63. What do we mean when we say that electron has NEGATIVE charge?

Discussion

3794.	Identify the mixture from the given options.
Answer» Identify the mixture from the given options.

Discussion

3795.	Which of the following is a homogeneous mixture?SeawaterButtermilkSugar SolutionStarch Solution
Answer» Which of the following is a homogeneous mixture? Seawater Buttermilk Sugar Solution Starch Solution

3795.

Which of the following is a homogeneous mixture?SeawaterButtermilkSugar SolutionStarch Solution

Answer»

Which of the following is a homogeneous mixture?

Seawater
Buttermilk
Sugar Solution
Starch Solution

Discussion

3796.	Fill in the blank: A substance with a very low ignition temperature can catch fire easily. Such a material is called a ___________ material.
Answer» Fill in the blank: A substance with a very low ignition temperature can catch fire easily. Such a material is called a ___________ material.

Discussion

3797.	Most metals react with dilute acids to produce -
Answer» Most metals react with dilute acids to produce -

Discussion

3798.	Hydrogen can be prepared by mixing steam and water gas at 673 K in presence of Fe2O3 and Cr2O3. This process is called:
Answer» Hydrogen can be prepared by mixing steam and water gas at 673 K in presence of $F e_{2} O_{3}$ and $C r_{2} O_{3}$ . This process is called:

Discussion

3799.	The process of hot air rising over cold air is called ___.
Answer» The process of hot air rising over cold air is called ___.

Discussion

3800.	Ganga is contaminated because ___ .
Answer» Ganga is contaminated because ___ .

Discussion

Explore topic-wise InterviewSolutions in .

write any three differences between displacement and double displacement reactions

Show that the circumference of bohr's orbit for hydrogen atom is an integral multiple of the de Broglie's wavelength associated with the electron revolving around the orbit.

In a reversible chemical change, the reverse reaction is releasing heat energy in surrounding. The forward reaction must have been ______________

How are mangoes preserved as pickles?

Which of these is used as a solvent for dry cleaning?

Why the maximum covalency of phosphorus is 6 but I find the maximum covalency of phosphorus is 5.

How can the hardness of water be removed by boiling?

Mention the conditions in which a solute becomes solvent and solvent becomes solute.

Air is an example of ______________.

Explain about metals and nonmetals important points from basics

what is the formula of methanamide

What will happen if heat is provided to pure oxygen?

30. What is the Oxidation product of hexan-3-one using selenium dioxide?

What is balancing an equation? Give detailed examples

How much energy would be needed to heat 450 grams of copper metal from a temperature of 35.0ºC to a temperature of 85.0ºC? The specific heat of metal at 35.0ºC is 0.385 J/g ºC.

Is Alloy an Homogeneous mixture?

What do you meant by "matter is not continuous"

under the same condition heats of formation of water and co2 are -285 and -394kj/mol respectively. the heat of formation of combustion of methane is -890 kj/mol. the heat of formation of methane is1)-9642)-8903)-2224)-74

Why do rotten egg float ?

Explain the following in terms of gain of oxygen with two examples each.(a) Oxidation(b) Reduction

Question 4What is the 5 R principle?

Silver foil is used for wrapping food. Which property of silver is used for this?

What should be done to conserve and suatian resource development

Whats is oleic acid?

Discuss bleaching action of chlorine.

Which of the following is a metal?

Electrical wires have plastic coating as:

Solar energy is an inexhaustible natural resource because:

Why amorphous solids are isotropic in nature

Due to a change in which of the following properties matter can change from one state to another?

29.The EMF of a chemical cell is positive when free energy change of reaction . (A)>0 (B) =0 (C)

75.Under identical condition of pressure and temperature 9.9ml of diatomic gasX2 and 3.3ml of diatomic gas Y2 react completely to produce 6.6ml of gaseous product molecular formula of product would be X3Y XY X2Y XY3

An organic compound has composition given as N=46.66%, C=20%, H=6.66%, o=26.6%. Determine, its empirical formula as well as molecular formula

Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place in 20 minutes, determine the total power spent by him.

Match the following for the flame of a candle.

4.Do non-metals show photoelectric effect? And what about liquid n gases?

14. 20ml sample of 0.2M solution of weak diprotic acid H2A is treated with o.2M NaOH . Molarity of solution of 2nd equivalent point is

Select the method used for water purification.

Iron isreactive than copper.

63. What do we mean when we say that electron has NEGATIVE charge?

Identify the mixture from the given options.

Which of the following is a homogeneous mixture?SeawaterButtermilkSugar SolutionStarch Solution

Fill in the blank: A substance with a very low ignition temperature can catch fire easily. Such a material is called a ___________ material.

Most metals react with dilute acids to produce -

Hydrogen can be prepared by mixing steam and water gas at 673 K in presence of Fe2O3 and Cr2O3. This process is called:

The process of hot air rising over cold air is called ___.

Ganga is contaminated because ___ .