15280 + Interview Questions in Chemistry Page 286 InterviewSolution

14251.	(a) Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion. (At. No. of Mg = 12 ) (b) Write down the electronic configuration of (i) sulphur atom and (ii) sulphur ion. (At. No. of S = 16)
Answer» (a) Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion. (At. No. of Mg = 12 ) (b) Write down the electronic configuration of (i) sulphur atom and (ii) sulphur ion. (At. No. of S = 16)

Discussion

14252.	How does the valency of elements change on moving from left to right in the third period of the periodic table?
Answer» How does the valency of elements change on moving from left to right in the third period of the periodic table?

Discussion

14253.	What happens when dilute hydrochloric acid is added to zinc pieces taken in a test tube:
Answer» What happens when dilute hydrochloric acid is added to zinc pieces taken in a test tube:

Discussion

14254.	Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
Answer» Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.

Discussion

14255.	Which has more atoms 200 g of argon or 200 g of neon? __
Answer» Which has more atoms 200 g of argon or 200 g of neon? __

Discussion

14256.	Which one of the following methods is best suited for the concentration of Bauxite ore?
Answer» Which one of the following methods is best suited for the concentration of Bauxite ore?

Discussion

14257.	The allotrope of carbon which has 60 carbon atoms is ___.
Answer» The allotrope of carbon which has 60 carbon atoms is ___.

Discussion

14258.	What do you observe when ethylene is passed through alkaline KMnO4 solution ?
Answer» What do you observe when ethylene is passed through alkaline $K M n O_{4}$ solution ?

Discussion

14259.	The property which is characteristic of an electrovalent compound is that:
Answer» The property which is characteristic of an electrovalent compound is that:

Discussion

14260.	Which of the following variables are sufficient to calculate molality?
Answer» Which of the following variables are sufficient to calculate molality?

Discussion

14261.	Question 44 (b) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the group number of these elements in the Periodic Table
Answer» Question 44 (b) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the group number of these elements in the Periodic Table

Discussion

14262.	Chemical formula of 'Aqua fortis' is?
Answer» Chemical formula of 'Aqua fortis' is?

Discussion

14263.	What is meant by the term hydrated salt? please explain in easy way to understand by me
Answer» What is meant by the term hydrated salt? please explain in easy way to understand by me

Discussion

14264.	Write equation for the reaction of zinc with hydrochloric acid and balance the equation .Find out the number of molecules of hydrogen gas produced in this reaction,when 1 Mole of HCl completely reacts at S.T. P.?
Answer» Write equation for the reaction of zinc with hydrochloric acid and balance the equation .Find out the number of molecules of hydrogen gas produced in this reaction,when 1 Mole of HCl completely reacts at S.T. P.?

Discussion

14265.	Why does Cu not liberate H2 on reacting with dilute sulphuric acid?
Answer» Why does Cu not liberate H2 on reacting with dilute sulphuric acid?

Discussion

14266.	In the laboratory during preparation of hydrogen gas mention the changes that would occur. Also write the chemical reaction for the following changes? in place of zinc granules ,same amount of zinc dust is taken in the test tube instead of dilute sulphuric acid ,hydrochloric acid is taken in place of zinc, copper turnings are taken Sodium Hydroxide is taken in place of sulphuric acid and the tube is heated
Answer» In the laboratory during preparation of hydrogen gas mention the changes that would occur. Also write the chemical reaction for the following changes? in place of zinc granules ,same amount of zinc dust is taken in the test tube instead of dilute sulphuric acid ,hydrochloric acid is taken in place of zinc, copper turnings are taken Sodium Hydroxide is taken in place of sulphuric acid and the tube is heated

Discussion

14267.	What is water of crystallisation?
Answer» What is water of crystallisation?

Discussion

14268.	Fill in the following blanks with suitable words: (a) The corrosion of iron is called.... (b) .....and .... are necessary for the rusting of iron. (c) The process of depositing a thin layer of zinc on iron articles is called... (d) Tiffin boxes are electroplated with .... but car bumpers are electroplated with .... to protect them from rusting. (e) The corrosion of copper produces a .... coating of basic copper carbonate on its surface. (f) Brass is an alloy of copper and.... (g) Bronze is an alloy of copper and.... (h) The non-metal present in steel is ... (i) The alloy in which one of the metals is mercury is called an (j) The electrical conductivity and melting point of an alloy is.... than that of pure metals. (k) The rocky material found with ores is called....
Answer» Fill in the following blanks with suitable words: (a) The corrosion of iron is called.... (b) .....and .... are necessary for the rusting of iron. (c) The process of depositing a thin layer of zinc on iron articles is called... (d) Tiffin boxes are electroplated with .... but car bumpers are electroplated with .... to protect them from rusting. (e) The corrosion of copper produces a .... coating of basic copper carbonate on its surface. (f) Brass is an alloy of copper and.... (g) Bronze is an alloy of copper and.... (h) The non-metal present in steel is ... (i) The alloy in which one of the metals is mercury is called an (j) The electrical conductivity and melting point of an alloy is.... than that of pure metals. (k) The rocky material found with ores is called....

Discussion

14269.	During the electrolysis of a saturated solution of sodium chloride, where is: (a) chlorine formed? (b) hydrogen formed? (c) sodium hydroxide formed?
Answer» During the electrolysis of a saturated solution of sodium chloride, where is: (a) chlorine formed? (b) hydrogen formed? (c) sodium hydroxide formed?

14269.

During the electrolysis of a saturated solution of sodium chloride, where is: (a) chlorine formed? (b) hydrogen formed? (c) sodium hydroxide formed?

Answer»

During the electrolysis of a saturated solution of sodium chloride, where is:

(a) chlorine formed?

(b) hydrogen formed?

(c) sodium hydroxide formed?

Discussion

14270.	The flow of energy in an ecosystem is always : (a) unidirectional (b) bidirectional (c) cyclic (d) multidirectional
Answer» The flow of energy in an ecosystem is always : (a) unidirectional (b) bidirectional (c) cyclic (d) multidirectional

14270.

The flow of energy in an ecosystem is always : (a) unidirectional (b) bidirectional (c) cyclic (d) multidirectional

Answer»

The flow of energy in an ecosystem is always :

(a) unidirectional (b) bidirectional (c) cyclic (d) multidirectional

Discussion

14271.	For which of the following ores calcination process cannot be used?
Answer» For which of the following ores calcination process cannot be used?

Discussion

14272.	Why is dil H2SO4 is added to the eletrolytiel solution?
Answer» Why is dil H2SO4 is added to the eletrolytiel solution?

Discussion

14273.	Explain the cleansing action of soap.
Answer» Explain the cleansing action of soap.

Discussion

14274.	To show that zinc is a more active metal than copper, the correct procedure is to:
Answer» To show that zinc is a more active metal than copper, the correct procedure is to:

Discussion

14275.	Question 12. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is (a) hydrochloric acid (b) tartaric acid (c) acetic acid (d) sulphuric acid
Answer» Question 12. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is (a) hydrochloric acid (b) tartaric acid (c) acetic acid (d) sulphuric acid

Discussion

14276.	Valencies of all elements
Answer» Valencies of all elements

Discussion

14277.	When we hit 2 stones they produce fire.....why ?? Why metals cannot do so????
Answer» When we hit 2 stones they produce fire.....why ?? Why metals cannot do so????

14277.

When we hit 2 stones they produce fire.....why ?? Why metals cannot do so????

Answer»

When we hit 2 stones they produce fire.....why ??

Why metals cannot do so????

Discussion

14278.	We need to balance a sketetal equation why?
Answer» We need to balance a sketetal equation why?

Discussion

14279.	How can 3 completely different looking substances be carbon,that is, Diamond, graphite and Coal?
Answer» How can 3 completely different looking substances be carbon,that is, Diamond, graphite and Coal?

Discussion

14280.	In the electrolysis of water 1. Name the gas collected at anode and cathode. 2. why is the volume of gas collected at one electrode double than the other? 3. what will happen if dil H2SO4 is not added to water
Answer» In the electrolysis of water 1. Name the gas collected at anode and cathode. 2. why is the volume of gas collected at one electrode double than the other? 3. what will happen if dil H2SO4 is not added to water

Discussion

14281.	Draw the structure for the following compounds: [3 MARKS] (i) Cyclohexane (ii) Hexanal (iii) Butanone
Answer» Draw the structure for the following compounds: [3 MARKS] (i) Cyclohexane (ii) Hexanal (iii) Butanone

Discussion

14282.	What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains 8 hydrogen atoms ?
Answer» What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains 8 hydrogen atoms ?

Discussion

14283.	Explain the working of a voltaic cell.
Answer» Explain the working of a voltaic cell.

Discussion

14284.	What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?
Answer» What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?

Discussion

14285.	Which of the following metals comes above zinc in reactivity series ?
Answer» Which of the following metals comes above zinc in reactivity series ?

Discussion

14286.	Water can be split into hydrogen and oxygen under suitable conditions. equation representing the change is : 2H2O(l) --------------- 2H2(g) + O2(g). (i) If a given experiment result in 2500 cm3 of hydrogen being produced, what value of oxygen is liberated at the same time under the same conditions of temperature and pressure? (ii) The 2500 cm3 of hydrogen is subjected to 2 1/2 times increases in pressure (temperature remaining constant ). What volume will the hydrogen now occupy ? (iii) Taking the volume of hydrogen calculated in (d) (ii), what change must be made in the kelvin (absolute) temprature to return the volume to 2500 cm3 (pressure remaining constant)?
Answer» Water can be split into hydrogen and oxygen under suitable conditions. equation representing the change is : 2H₂O(l) --------------- 2H₂(g) + O₂(g). (i) If a given experiment result in 2500 cm³ of hydrogen being produced, what value of oxygen is liberated at the same time under the same conditions of temperature and pressure? (ii) The 2500 cm³ of hydrogen is subjected to 2 _1/2 times increases in pressure (temperature remaining constant ). What volume will the hydrogen now occupy ? (iii) Taking the volume of hydrogen calculated in (d) (ii), what change must be made in the kelvin (absolute) temprature to return the volume to 2500 cm³ (pressure remaining constant)?

14286.

Water can be split into hydrogen and oxygen under suitable conditions. equation representing the change is : 2H2O(l) --------------- 2H2(g) + O2(g). (i) If a given experiment result in 2500 cm3 of hydrogen being produced, what value of oxygen is liberated at the same time under the same conditions of temperature and pressure? (ii) The 2500 cm3 of hydrogen is subjected to 2 1/2 times increases in pressure (temperature remaining constant ). What volume will the hydrogen now occupy ? (iii) Taking the volume of hydrogen calculated in (d) (ii), what change must be made in the kelvin (absolute) temprature to return the volume to 2500 cm3 (pressure remaining constant)?

Answer»

Water can be split into hydrogen and oxygen under suitable conditions.
equation representing the change is :
2H₂O(l) --------------- 2H₂(g) + O₂(g).

(i) If a given experiment result in 2500 cm³ of hydrogen being produced, what value of oxygen is liberated at the same time under the same conditions of temperature and pressure?

(ii) The 2500 cm³ of hydrogen is subjected to 2 _1/2 times increases in pressure (temperature remaining constant ). What volume will the hydrogen now occupy ?

(iii) Taking the volume of hydrogen calculated in (d) (ii), what change must be made in the kelvin (absolute) temprature to return the volume to 2500 cm³ (pressure remaining constant)?

Discussion

14287.	What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.
Answer» What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

Discussion

14288.	Which of the following statements is not applicable to carbon compounds?
Answer» Which of the following statements is not applicable to carbon compounds?

Discussion

14289.	What is decomposition ? Support your answer by an example.
Answer» What is decomposition ? Support your answer by an example.

Discussion

14290.	Match the following: Minerals Typical areas of occurenceA. Coal 1. BhandaraB. Gold 2. KaranpuraC. Mica 3. HuttiD. Manganese 4.Nellore
Answer» Match the following: $\begin{matrix} M i n e r a l s & T y p i c a l a r e a s o f o c c u r e n c e A . C o a l & 1. B h a n d a r a B . G o l d & 2. K a r a n p u r a C . M i c a & 3. H u t t i D . M a n g a n e s e & 4. N e l l o r e \end{matrix}$

Discussion

14291.	If frequency of certain wave is 200 s−1, what would be the energy of this wave?
Answer» If frequency of certain wave is $200 s^{- 1}$ , what would be the energy of this wave?

Discussion

14292.	The potential difference between electrode and electrolyte is called ___
Answer» The potential difference between electrode and electrolyte is called ___

Discussion

14293.	Which organisms accumulate the pesticides contained in the bodies of their prey.
Answer» Which organisms accumulate the pesticides contained in the bodies of their prey.

Discussion

14294.	We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?
Answer» We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?

14294.

We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?

Answer»

We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?

Discussion

14295.	Identify the compound that exhibits tautomerism?
Answer» Identify the compound that exhibits tautomerism?

Discussion

14296.	The number of moles present in 11.2 litres of CO2 at S.T.P is:
Answer» The number of moles present in 11.2 litres of ${CO}_{2}$ at S.T.P is:

Discussion

14297.	Sugar syrup is used to coat sweets which becomes hard once cooled. From this observation what can we can conclude about the sugar syrup?
Answer» Sugar syrup is used to coat sweets which becomes hard once cooled. From this observation what can we can conclude about the sugar syrup?

Discussion

14298.	(a) (i) Calculate the volume of 320 of SO2 at STP. (Atomic mass : S = 32 and O = 16). (ii) State Gay-Lussac's law of combining volume (iii) Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8) (Atomic mass; C = 12, 0 = 16, H = 1, Molar volume −22.4dm3 (b) (i) An organic compound with vapour density = 94 contains C = 12.67% H = 2.13 % and Br = 85.11% Find the molecular formula. [Atomic mass ; C = 12, H = 1, Br = 80] (ii) Calculate the mass of (1) 1022 Atoms of sulphur. (2) 0.1 mole of carbon dioxide. [Atomic mass; S = 32, C = 12 and O = 16 and Avogadro's number =6×1023
Answer» (a) (i) Calculate the volume of 320 of $S O_{2}$ at STP. (Atomic mass : S = 32 and O = 16). (ii) State Gay-Lussac's law of combining volume (iii) Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane $(C_{3} H_{8})$ (Atomic mass; C = 12, 0 = 16, H = 1, Molar volume $- 22.4 d m^{3}$ (b) (i) An organic compound with vapour density = 94 contains C = 12.67% H = 2.13 % and Br = 85.11% Find the molecular formula. [Atomic mass ; C = 12, H = 1, Br = 80] (ii) Calculate the mass of (1) $10^{22}$ Atoms of sulphur. (2) 0.1 mole of carbon dioxide. [Atomic mass; S = 32, C = 12 and O = 16 and Avogadro's number $= 6 \times 10^{23}$

14298.

(a) (i) Calculate the volume of 320 of SO2 at STP. (Atomic mass : S = 32 and O = 16). (ii) State Gay-Lussac's law of combining volume (iii) Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8) (Atomic mass; C = 12, 0 = 16, H = 1, Molar volume −22.4dm3 (b) (i) An organic compound with vapour density = 94 contains C = 12.67% H = 2.13 % and Br = 85.11% Find the molecular formula. [Atomic mass ; C = 12, H = 1, Br = 80] (ii) Calculate the mass of (1) 1022 Atoms of sulphur. (2) 0.1 mole of carbon dioxide. [Atomic mass; S = 32, C = 12 and O = 16 and Avogadro's number =6×1023

Answer»

(a)

(i) Calculate the volume of 320 of $S O_{2}$ at STP. (Atomic mass : S = 32 and O = 16).
(ii) State Gay-Lussac's law of combining volume
(iii) Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane $(C_{3} H_{8})$ (Atomic mass; C = 12, 0 = 16, H = 1, Molar volume $- 22.4 d m^{3}$

(b)

(i) An organic compound with vapour density = 94 contains
C = 12.67% H = 2.13 % and Br = 85.11% Find the molecular formula.
[Atomic mass ; C = 12, H = 1, Br = 80]
(ii) Calculate the mass of
(1) $10^{22}$ Atoms of sulphur.
(2) 0.1 mole of carbon dioxide.
[Atomic mass; S = 32, C = 12 and O = 16 and Avogadro's number $= 6 \times 10^{23}$

Discussion

14299.	Which of the following is true about chemical reaction?
Answer» Which of the following is true about chemical reaction?

Discussion

14300.	The electronic configuration of a dipositive metal M2+ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be
Answer» The electronic configuration of a dipositive metal $M^{2 +}$ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be

Discussion

Explore topic-wise InterviewSolutions in .

(a) Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion. (At. No. of Mg = 12 ) (b) Write down the electronic configuration of (i) sulphur atom and (ii) sulphur ion. (At. No. of S = 16)

How does the valency of elements change on moving from left to right in the third period of the periodic table?

What happens when dilute hydrochloric acid is added to zinc pieces taken in a test tube:

Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.

Which has more atoms 200 g of argon or 200 g of neon? __

Which one of the following methods is best suited for the concentration of Bauxite ore?

The allotrope of carbon which has 60 carbon atoms is ___.

What do you observe when ethylene is passed through alkaline KMnO4 solution ?

The property which is characteristic of an electrovalent compound is that:

Which of the following variables are sufficient to calculate molality?

Question 44 (b) Atomic number of a few elements are given below 10, 20, 7, 14. Identify the group number of these elements in the Periodic Table

Chemical formula of 'Aqua fortis' is?

What is meant by the term hydrated salt? please explain in easy way to understand by me

Write equation for the reaction of zinc with hydrochloric acid and balance the equation .Find out the number of molecules of hydrogen gas produced in this reaction,when 1 Mole of HCl completely reacts at S.T. P.?

Why does Cu not liberate H2 on reacting with dilute sulphuric acid?

What is water of crystallisation?

During the electrolysis of a saturated solution of sodium chloride, where is: (a) chlorine formed? (b) hydrogen formed? (c) sodium hydroxide formed?

The flow of energy in an ecosystem is always : (a) unidirectional (b) bidirectional (c) cyclic (d) multidirectional

For which of the following ores calcination process cannot be used?

Why is dil H2SO4 is added to the eletrolytiel solution?

Explain the cleansing action of soap.

To show that zinc is a more active metal than copper, the correct procedure is to:

Question 12. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is (a) hydrochloric acid (b) tartaric acid (c) acetic acid (d) sulphuric acid

Valencies of all elements

When we hit 2 stones they produce fire.....why ?? Why metals cannot do so????

We need to balance a sketetal equation why?

How can 3 completely different looking substances be carbon,that is, Diamond, graphite and Coal?

In the electrolysis of water 1. Name the gas collected at anode and cathode. 2. why is the volume of gas collected at one electrode double than the other? 3. what will happen if dil H2SO4 is not added to water

Draw the structure for the following compounds: [3 MARKS] (i) Cyclohexane (ii) Hexanal (iii) Butanone

What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains 8 hydrogen atoms ?

Explain the working of a voltaic cell.

What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?

Which of the following metals comes above zinc in reactivity series ?

What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

Which of the following statements is not applicable to carbon compounds?

What is decomposition ? Support your answer by an example.

Match the following: Minerals Typical areas of occurenceA. Coal 1. BhandaraB. Gold 2. KaranpuraC. Mica 3. HuttiD. Manganese 4.Nellore

If frequency of certain wave is 200 s−1, what would be the energy of this wave?

The potential difference between electrode and electrolyte is called ___

Which organisms accumulate the pesticides contained in the bodies of their prey.

We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?

Identify the compound that exhibits tautomerism?

The number of moles present in 11.2 litres of CO2 at S.T.P is:

Sugar syrup is used to coat sweets which becomes hard once cooled. From this observation what can we can conclude about the sugar syrup?

Which of the following is true about chemical reaction?

The electronic configuration of a dipositive metal M2+ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be