10223 + Interview Questions in Chemistry Page 184 InterviewSolution

9151.	4.4 gm of CO2 and 2.24 litres of H2 at STP (1 atm, 273 K)are mixed in a container. The total number of molecules present in the container will be:
Answer» $4.4$ gm of $C O_{2}$ and $2.24$ litres of $H_{2}$ at STP (1 atm, 273 K)are mixed in a container. The total number of molecules present in the container will be:

Discussion

9152.	Solids and liquids are collectively known as condensed phases . Explain
Answer» Solids and liquids are collectively known as condensed phases . Explain

Discussion

9153.	Write the name , colour and solubility of precipitate in excess of NaOH formed when- 1- Zinc Sulphate and 2- Ferric Chloride reacts sodium hydroxide
Answer» Write the name , colour and solubility of precipitate in excess of NaOH formed when- 1- Zinc Sulphate and 2- Ferric Chloride reacts sodium hydroxide

Discussion

9154.	Which of the following statements is not correct about the process shown above?
Answer» Which of the following statements is not correct about the process shown above?

9154.

Which of the following statements is not correct about the process shown above?

Answer»

Which of the following statements is not correct about the process shown above?

Discussion

9155.	What type of mixture is seperated by crystallization? Why is it preferred over evaporation?
Answer» What type of mixture is seperated by crystallization? Why is it preferred over evaporation?

Discussion

9156.	What Massi of silver nitrate will react with 8.85 g of Nacl to produce 14.35 of silver chloride and 8.5g of sodium nitrate?
Answer» What Massi of silver nitrate will react with 8.85 g of Nacl to produce 14.35 of silver chloride and 8.5g of sodium nitrate?

Discussion

9157.	Law of constant proportion given by Joseph Proust that a chemical compound always consists of same element combined together in the same proportion by mass but there are some compound which are allotropic for example hydrogen and oxygen forms compound water which can be H2O or D2O that is heavy oxygen so this law should be wrong. This is same compound but with different mass
Answer» Law of constant proportion given by Joseph Proust that a chemical compound always consists of same element combined together in the same proportion by mass but there are some compound which are allotropic for example hydrogen and oxygen forms compound water which can be H2O or D2O that is heavy oxygen so this law should be wrong. This is same compound but with different mass

Discussion

9158.	How is atomic mass different from mass number?Kindly explain it in detail.
Answer» How is atomic mass different from mass number?Kindly explain it in detail.

Discussion

9159.	It refers to the process by which atoms are changed into ions through the removal or addition of electrons, giving them an electrical charge.
Answer» It refers to the process by which atoms are changed into ions through the removal or addition of electrons, giving them an electrical charge.

Discussion

9160.	What is orbital?
Answer» What is orbital?

Discussion

9161.	What is the difference between molecular mass and molar mass
Answer» What is the difference between molecular mass and molar mass

Discussion

9162.	How much amount of hydrogen (in g) is required to react with 36 g of carbon to form methane (CH4)?12
Answer» How much amount of hydrogen (in g) is required to react with 36 g of carbon to form methane $({CH}_{4})$ ? 12

Discussion

9163.	Which of the following will show Tyndall effect?
Answer» Which of the following will show Tyndall effect?

Discussion

9164.	Question 35 Express each of the following in kilograms (a) 5.84×10−3mg (b) 58.34g (c) 0.584g (d) 5.873×10−21g
Answer» Question 35 Express each of the following in kilograms (a) $5.84 \times 10^{- 3} m g$ (b) $58.34 g$ (c) $0.584 g$ (d) $5.873 \times 10^{- 21} g$

Discussion

9165.	Which of the following subatomic particles is present in equal numbers in a neutral atom?
Answer» Which of the following subatomic particles is present in equal numbers in a neutral atom?

Discussion

9166.	(a) Which of the nuclear particles is present in the same atoms of any particular element?, (b) What do we call this number which is characteristic of a particular element?
Answer» (a) Which of the nuclear particles is present in the same atoms of any particular element?, (b) What do we call this number which is characteristic of a particular element?

Discussion

9167.	Give three features of the Rutherford's model of atom. [3 MARKS]
Answer» Give three features of the Rutherford's model of atom. [3 MARKS]

Discussion

9168.	BaCl2+H2SO4→BaSO4↓+2HCl. The reaction given above is an example of:
Answer» $B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} ↓ + 2 H C l$ . The reaction given above is an example of:

Discussion

9169.	What do you mean by sublimation
Answer» What do you mean by sublimation

Discussion

9170.	Write the electronic configuration of an element whose mass number is 31 and atomic number is 15 . What is its valency?
Answer» Write the electronic configuration of an element whose mass number is 31 and atomic number is 15 . What is its valency?

Discussion

9171.	Question 3 (a) 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). a. What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?
Answer» Question 3 (a) 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). a. What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Discussion

9172.	Which of the following is/are the uses of oxygen?
Answer» Which of the following is/are the uses of oxygen?

Discussion

9173.	(a) State the various postulates of Dalton's atomic theory of matter. (b) Which postulate of Dalton's atomic theory can explain the law of conservation of mass? (c) Which postulate of Dalton's atomic theory can explain the law of constant proportions?
Answer» (a) State the various postulates of Dalton's atomic theory of matter. (b) Which postulate of Dalton's atomic theory can explain the law of conservation of mass? (c) Which postulate of Dalton's atomic theory can explain the law of constant proportions?

9173.

(a) State the various postulates of Dalton's atomic theory of matter. (b) Which postulate of Dalton's atomic theory can explain the law of conservation of mass? (c) Which postulate of Dalton's atomic theory can explain the law of constant proportions?

Answer»

(a) State the various postulates of Dalton's atomic theory of matter.

(b) Which postulate of Dalton's atomic theory can explain the law of conservation of mass?

(c) Which postulate of Dalton's atomic theory can explain the law of constant proportions?

Discussion

9174.	Use the following information to answer the next question. At a critical temperature, a substance behaves like a superconductor. Critical temperatures for solid mercury and magnesium diboride (MgB2) are 4.2 K and 39 K respectively. The respective critical temperatures of the given substances in the Fahrenheit scale are
Answer» Use the following information to answer the next question. At a critical temperature, a substance behaves like a superconductor. Critical temperatures for solid mercury and magnesium diboride (MgB₂) are 4.2 K and 39 K respectively. The respective critical temperatures of the given substances in the Fahrenheit scale are

9174.

Use the following information to answer the next question. At a critical temperature, a substance behaves like a superconductor. Critical temperatures for solid mercury and magnesium diboride (MgB2) are 4.2 K and 39 K respectively. The respective critical temperatures of the given substances in the Fahrenheit scale are

Answer»

Use the following information to answer the next question.

At a critical temperature, a substance behaves like a superconductor. Critical temperatures for solid mercury and magnesium diboride (MgB₂) are 4.2 K and 39 K respectively.

The respective critical temperatures of the given substances in the Fahrenheit scale are

Discussion

9175.	Which of the following substances are supporters of combustion?
Answer» Which of the following substances are supporters of combustion?

Discussion

9176.	How to find a atomic number of element
Answer» How to find a atomic number of element

Discussion

9177.	Why the bubbles will be in the spherical shape ? why not flate?
Answer» Why the bubbles will be in the spherical shape ? why not flate?

Discussion

9178.	There are two elements A 26 mass number and 13 atomic number and B 26 mass number and 14 atomic number . find the number of sub atomic particles in each of these elements.what is the relationship between the two?
Answer» There are two elements A 26 mass number and 13 atomic number and B 26 mass number and 14 atomic number . find the number of sub atomic particles in each of these elements.what is the relationship between the two?

Discussion

9179.	Use the following information to answer the next question. The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are − 348 M and − 432 N respectively. What is the ratio of TM to TN?
Answer» Use the following information to answer the next question. The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are − 348 M and − 432 N respectively. What is the ratio of T_M to T_N?

9179.

Use the following information to answer the next question. The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are − 348 M and − 432 N respectively. What is the ratio of TM to TN?

Answer»

Use the following information to answer the next question.

The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are − 348 M and − 432 N respectively.

What is the ratio of T_M to T_N?

Discussion

9180.	Steam coming out of pressure cooker are invisible till a certain radial distance is reached. Why?
Answer» Steam coming out of pressure cooker are invisible till a certain radial distance is reached. Why?

Discussion

9181.	The oxidizing capacity of the third period elements (up to halogens) increases across a period. Explain.
Answer» The oxidizing capacity of the third period elements (up to halogens) increases across a period. Explain.

Discussion

9182.	Identify X in the below equation. CaCO3+HCl→CaCl2+X+H2O
Answer» Identify X in the below equation. $C a C O_{3} + H C l \to C a C l_{2} + X + H_{2} O$

Discussion

9183.	Give 3 important postulates of Bohr's model of an atom.
Answer» Give 3 important postulates of Bohr's model of an atom.

Discussion

9184.	why does water at 0 c have more energy than ice at the same temperature? explain your answer in latent heat of vaporization.
Answer» why does water at 0 c have more energy than ice at the same temperature? explain your answer in latent heat of vaporization.

Discussion

9185.	The teacher asked Sushma that in ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
Answer» The teacher asked Sushma that in ethyl ethanoate $(C H_{3} C O O C_{2} H_{5})$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

Discussion

9186.	The maximum capacity to hold electrons in the first shell is:
Answer» The maximum capacity to hold electrons in the first shell is:

Discussion

9187.	What mass of Mg(OH)2 is required to neutralise 125 ml of 0.136 M hydrochloric acid solution ?Molar mass ofMg(OH)2 = 58.33 g mol−1
Answer» What mass of $M g (O H)_{2}$ is required to neutralise 125 ml of 0.136 M hydrochloric acid solution ?Molar mass of $M g (O H)_{2}$ = 58.33 g $m o l^{- 1}$

Discussion

9188.	Identify the correct option that refers to 'Van der waals forces'.
Answer» Identify the correct option that refers to 'Van der waals forces'.

Discussion

9189.	What are the kinds of mixture?
Answer» What are the kinds of mixture?

Discussion

9190.	Question 13 Composition of the nuclei of two atomic species, X and Y are given as under X Y Protons = 6 6 Neutrons = 6 8 Give the mass numbers of X and Y. What is the relation between the two species?
Answer» Question 13 Composition of the nuclei of two atomic species, X and Y are given as under X Y Protons = 6 6 Neutrons = 6 8 Give the mass numbers of X and Y. What is the relation between the two species?

Discussion

9191.	Question 1 (f) Which separation techniques will you apply for the separation of the following? f. Oil from water.
Answer» Question 1 (f) Which separation techniques will you apply for the separation of the following? f. Oil from water.

Discussion

9192.	What will happen if we pick up weights one by one from the top of the setup?
Answer» What will happen if we pick up weights one by one from the top of the setup?

9192.

What will happen if we pick up weights one by one from the top of the setup?

Answer»

What will happen if we pick up weights one by one from the top of the setup?

Discussion

9193.	Question 7 (i) Which of the following materials fall in the category of a “pure substance”? i. Air
Answer» Question 7 (i) Which of the following materials fall in the category of a “pure substance”? i. Air

Discussion

9194.	What is the normality of a KMnO4 solution in which 15.8 g of KMnO4 is present in 250 mL solution and the solution is used as an oxidant, where MnO4− is reduced to Mn2+ ? (Given: molar mass of KMnO4=158 gmol−1 )
Answer» What is the normality of a $K M n O_{4}$ solution in which $15.8 g$ of $K M n O_{4}$ is present in $250 m L$ solution and the solution is used as an oxidant, where ${M n O_{4}}^{-}$ is reduced to ${M n}^{2 +}$ ? (Given: molar mass of $K M n O_{4} = 158 g m o l^{- 1}$ )

Discussion

9195.	During a physical change or chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states that?
Answer» During a physical change or chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states that?

Discussion

9196.	Name the process you would use to separate a mixture of water and alcohol.
Answer» Name the process you would use to separate a mixture of water and alcohol.

Discussion

9197.	Question 3 For any substance, why does the temperature remain constant during the change of state?
Answer» Question 3 For any substance, why does the temperature remain constant during the change of state?

Discussion

9198.	Which of the following are the isotopes of hydrogen?
Answer» Which of the following are the isotopes of hydrogen?

Discussion

9199.	The atomic weight of Cl is:
Answer» The atomic weight of Cl is:

Discussion

9200.	Which of the below given options are correct for the electrolysis of aqueous copper sulphate solution with copper electrode?
Answer» Which of the below given options are correct for the electrolysis of aqueous copper sulphate solution with copper electrode?

Discussion

Explore topic-wise InterviewSolutions in .

4.4 gm of CO2 and 2.24 litres of H2 at STP (1 atm, 273 K)are mixed in a container. The total number of molecules present in the container will be:

Solids and liquids are collectively known as condensed phases . Explain

Write the name , colour and solubility of precipitate in excess of NaOH formed when- 1- Zinc Sulphate and 2- Ferric Chloride reacts sodium hydroxide

Which of the following statements is not correct about the process shown above?

What type of mixture is seperated by crystallization? Why is it preferred over evaporation?

What Massi of silver nitrate will react with 8.85 g of Nacl to produce 14.35 of silver chloride and 8.5g of sodium nitrate?

How is atomic mass different from mass number?Kindly explain it in detail.

It refers to the process by which atoms are changed into ions through the removal or addition of electrons, giving them an electrical charge.

What is orbital?

What is the difference between molecular mass and molar mass

How much amount of hydrogen (in g) is required to react with 36 g of carbon to form methane (CH4)?12

Which of the following will show Tyndall effect?

Question 35 Express each of the following in kilograms (a) 5.84×10−3mg (b) 58.34g (c) 0.584g (d) 5.873×10−21g

Which of the following subatomic particles is present in equal numbers in a neutral atom?

(a) Which of the nuclear particles is present in the same atoms of any particular element?, (b) What do we call this number which is characteristic of a particular element?

Give three features of the Rutherford's model of atom. [3 MARKS]

BaCl2+H2SO4→BaSO4↓+2HCl. The reaction given above is an example of:

What do you mean by sublimation

Write the electronic configuration of an element whose mass number is 31 and atomic number is 15 . What is its valency?

Which of the following is/are the uses of oxygen?

(a) State the various postulates of Dalton's atomic theory of matter. (b) Which postulate of Dalton's atomic theory can explain the law of conservation of mass? (c) Which postulate of Dalton's atomic theory can explain the law of constant proportions?

Which of the following substances are supporters of combustion?

How to find a atomic number of element

Why the bubbles will be in the spherical shape ? why not flate?

There are two elements A 26 mass number and 13 atomic number and B 26 mass number and 14 atomic number . find the number of sub atomic particles in each of these elements.what is the relationship between the two?

Use the following information to answer the next question. The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are ­− 348 M and − 432 N respectively. What is the ratio of TM to TN?

Steam coming out of pressure cooker are invisible till a certain radial distance is reached. Why?

The oxidizing capacity of the third period elements (up to halogens) increases across a period. Explain.

Identify X in the below equation. CaCO3+HCl→CaCl2+X+H2O

Give 3 important postulates of Bohr's model of an atom.

why does water at 0 c have more energy than ice at the same temperature? explain your answer in latent heat of vaporization.

The teacher asked Sushma that in ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

The maximum capacity to hold electrons in the first shell is:

What mass of Mg(OH)2 is required to neutralise 125 ml of 0.136 M hydrochloric acid solution ?Molar mass ofMg(OH)2 = 58.33 g mol−1

Identify the correct option that refers to 'Van der waals forces'.

What are the kinds of mixture?

Question 13 Composition of the nuclei of two atomic species, X and Y are given as under X Y Protons = 6 6 Neutrons = 6 8 Give the mass numbers of X and Y. What is the relation between the two species?

Question 1 (f) Which separation techniques will you apply for the separation of the following? f. Oil from water.

What will happen if we pick up weights one by one from the top of the setup?

Question 7 (i) Which of the following materials fall in the category of a “pure substance”? i. Air

What is the normality of a KMnO4 solution in which 15.8 g of KMnO4 is present in 250 mL solution and the solution is used as an oxidant, where MnO4− is reduced to Mn2+ ? (Given: molar mass of KMnO4=158 gmol−1 )

During a physical change or chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states that?

Name the process you would use to separate a mixture of water and alcohol.

Question 3 For any substance, why does the temperature remain constant during the change of state?

Which of the following are the isotopes of hydrogen?

The atomic weight of Cl is:

Which of the below given options are correct for the electrolysis of aqueous copper sulphate solution with copper electrode?

Use the following information to answer the next question. The critical temperature for solid mercury is 4.2 K. It is given that the critical temperatures for solid mercury on two scales M and N are − 348 M and − 432 N respectively. What is the ratio of TM to TN?