10223 + Interview Questions in Chemistry Page 37 InterviewSolution

1801.	Q 8/15 The density of ice is y g/L and that of water isx g/L. What is the change in volume when m gram ofice melts?
Answer» Q 8/15 The density of ice is y g/L and that of water isx g/L. What is the change in volume when m gram ofice melts?

Discussion

1802.	_______ is the introduction of contaminants into the natural environment causing adverse changes in it.
Answer» _______ is the introduction of contaminants into the natural environment causing adverse changes in it.

Discussion

1803.	Which of the following represents Volume - Pressure graph for Ideal gas?
Answer» Which of the following represents Volume - Pressure graph for Ideal gas?

Discussion

1804.	How does NH3 and HCl gases reacts as acid reacts in aquous meadium
Answer» How does NH3 and HCl gases reacts as acid reacts in aquous meadium

Discussion

1805.	1. If a element has a total of 20 electrons then why does it full it's 3rd shell with only 8 electrons and not 10 when 18 can be accommodated in the 3rd shell 2. If a element with electronic configuration 2,8,8,2 gains more electrons which shell well it start filling the 3rd or the 2nd
Answer» 1. If a element has a total of 20 electrons then why does it full it's 3rd shell with only 8 electrons and not 10 when 18 can be accommodated in the 3rd shell 2. If a element with electronic configuration 2,8,8,2 gains more electrons which shell well it start filling the 3rd or the 2nd

Discussion

1806.	One litre of a gas at 10∘C is heated till both its volume and pressure are tripled. Find the new temperature.
Answer» One litre of a gas at $10^{\circ} C$ is heated till both its volume and pressure are tripled. Find the new temperature.

Discussion

1807.	Is diamond pure?
Answer» Is diamond pure?

Discussion

1808.	The oxidizing properties of Nitric Acid is due to
Answer» The oxidizing properties of Nitric Acid is due to

Discussion

1809.

Select words from the above box to describe the characters in the play as revealed by the following lines from the play. Lines from the play Speaker Quality revealed 1. “You told him she was feeling poorly, did you? And so my brother is to be kept out of bed, and go without his supper because you told him she was feeling poorly.” 2. “take my comforter, it will keep you warm.” 3. “If people lie to me they are poorer, not I.” 4. “You are like a child. I can’t trust you out of my sight. No sooner my back is turned than you get that minx Marie to sell the silver salt-cellars.” 5. “My dear there is so much suffering in the world, and I can do so very little.” 6. “My mother gave them to me on − on her death bed just after you were born, and − and she asked me to keep them in remembrance of her, so I would like to keep them.” 7. “I am too old a bird to be caught with chaff.” 8. “You have your soul to lose, my son.” 9. “Give me food or I’ll stick my knife in you both and help myself.” 10. “they have made me what I am, they have made me a thief. God curse them all.” 11. “Why the devil are you kind to me? What do you want?” 12. “I − I − didn’t believe there was any good in the world…but somehow I − I − know you’re good, and − and it’s a queer thing to ask, but could you, would you bless me before I go?”

Answer»

Select
words from the above box to describe the characters in the play as
revealed by the following lines from the play.

Lines from the play	Speaker	Quality revealed
1. “You told him she was feeling poorly, did you? And so my brother is to be kept out of bed, and go without his supper because you told him she was feeling poorly.”
2. __________ “take my comforter, it will keep you warm.”
3. “If people lie to me they are poorer, not I.”
4. “You are like a child. I can’t trust you out of my sight. No sooner my back is turned than you get that minx Marie to sell the silver salt-cellars.”
5. “My dear there is so much suffering in the world, and I can do so very little.”
6. “My mother gave them to me on − on her death bed just after you were born, and − and she asked me to keep them in remembrance of her, so I would like to keep them.”
7. “I am too old a bird to be caught with chaff.”
8. “You have your soul to lose, my son.”
9. “Give me food or I’ll stick my knife in you both and help myself.”
10. “__________they have made me what I am, they have made me a thief. God curse them all.”
11. “Why the devil are you kind to me? What do you want?”
12. “I − I − didn’t believe there was any good in the world…but somehow I − I − know you’re good, and − and it’s a queer thing to ask, but could you, would you bless me before I go?”

Discussion

1810.	14 What is the diffrence between atom and molecule
Answer» 14 What is the diffrence between atom and molecule

Discussion

1811.	In what ratio by mass the gases CO and 2-butene be mixed in a vessel so that they same partial pressure
Answer» In what ratio by mass the gases CO and 2-butene be mixed in a vessel so that they same partial pressure

Discussion

1812.	In 250 g of an aqueous sugar solution, 5 g of sugar is present. Calculate the percentage composition (w/w) of the mixture.
Answer» In $250 g$ of an aqueous sugar solution, $5 g$ of sugar is present. Calculate the percentage composition $(w / w)$ of the mixture.

Discussion

1813.	Write the electronic configuration of the following elements.Na, Mg, Al, and Si.
Answer» Write the electronic configuration of the following elements. Na, Mg, Al, and Si.

1813.

Write the electronic configuration of the following elements.Na, Mg, Al, and Si.

Answer»

Write the electronic configuration of the following elements.

Na, Mg, Al, and Si.

Discussion

1814.	(a) What is the action of red litmus on: (i) Dry ammonia gas (ii) Solution of ammonia gas in water (b)State the observations when ammonium hydroxide is added to the aqueous solution of: (i) Ferrous sulphate (ii) Aluminium chloride.
Answer» (a) What is the action of red litmus on: (i) Dry ammonia gas (ii) Solution of ammonia gas in water (b)State the observations when ammonium hydroxide is added to the aqueous solution of: (i) Ferrous sulphate (ii) Aluminium chloride.

1814.

(a) What is the action of red litmus on: (i) Dry ammonia gas (ii) Solution of ammonia gas in water (b)State the observations when ammonium hydroxide is added to the aqueous solution of: (i) Ferrous sulphate (ii) Aluminium chloride.

Answer»

(a) What is the action of red litmus on:
(i) Dry ammonia gas (ii) Solution of ammonia gas in water

(b)State the observations when ammonium hydroxide is added to the aqueous solution of:
(i) Ferrous sulphate (ii) Aluminium chloride.

Discussion

1815.	(a) Define valency of an element. What valency will be shown by an element having atomic number 14?(b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.
Answer» (a) Define valency of an element. What valency will be shown by an element having atomic number 14? (b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.

Discussion

1816.	पुस्तककेपहलेअध्यायकेपहलेअनुच्छेदमेंलेखकनेसजीवढंगसेअवधकीतसवीरप्रस्तुतकीहै।तुमभीअपनेआसपासकीकिसीजगहकाऐसाहीबारीकचित्रणकरो।यहचित्रणमोहल्लेकेचबूतरे,गलीकीचहल-पहल,सड़ककेनज़ारेआदिकिसीकाभीहोसकताहैजिससेतुमअच्छीतरहपरिचितहो।
Answer» पुस्तक के पहले अध्याय के पहले अनुच्छेद में लेखक ने सजीव ढंग से अवध की तसवीर प्रस्तुत की है। तुम भी अपने आसपास की किसी जगह का ऐसा ही बारीक चित्रण करो। यह चित्रण मोहल्ले के चबूतरे, गली की चहल-पहल, सड़क के नज़ारे आदि किसी का भी हो सकता है जिससे तुम अच्छी तरह परिचित हो।

Discussion

1817.	10. why phosphorous exist as P4 molecule?d=
Answer» 10. why phosphorous exist as P4 molecule?d=

Discussion

1818.	One mole of N2 gas at 0.8 ATM takes 38 sec to diffuse through a pin hole, where as one mole of an unknown compound of Xenon with F at 1.6 ATM takes 57 sec to diffuse through the same hole. Calculate the molecular formula of the compound
Answer» One mole of N2 gas at 0.8 ATM takes 38 sec to diffuse through a pin hole, where as one mole of an unknown compound of Xenon with F at 1.6 ATM takes 57 sec to diffuse through the same hole. Calculate the molecular formula of the compound

Discussion

1819.	a gaseous mixture contains one mole of gas A (monatomic) and another gas B (diatomic) at same temperature . Find the number of moles of B if Gamma for the mixture is 19/13.
Answer» a gaseous mixture contains one mole of gas A (monatomic) and another gas B (diatomic) at same temperature . Find the number of moles of B if Gamma for the mixture is 19/13.

Discussion

1820.	Atomic number (Z) of Iron, Fe is 26, Atomic mass 56. Using the above information answer the following.(a) 1 mole of iron weighs …………….. grams.(b) 7.4 mole of iron contains …………… atoms.(c) 7.4 moles of iron weighs ……………. grams.(d) 1 gram of iron contains ……………... atoms.(e) 1 atom of iron weighs ………………. grams.(f) 1.2 × 1024 atoms of iron would be …………….. moles of iron.(g) 1.2 × 1024 atoms of iron weigh …………….. grams.
Answer» Atomic number (Z) of Iron, Fe is 26, Atomic mass 56. Using the above information answer the following. (a) 1 mole of iron weighs …………….. grams. (b) 7.4 mole of iron contains …………… atoms. (c) 7.4 moles of iron weighs ……………. grams. (d) 1 gram of iron contains ……………... atoms. (e) 1 atom of iron weighs ………………. grams. (f) 1.2 × 10²⁴ atoms of iron would be …………….. moles of iron. (g) 1.2 × 10²⁴ atoms of iron weigh …………….. grams.

1820.

Atomic number (Z) of Iron, Fe is 26, Atomic mass 56. Using the above information answer the following.(a) 1 mole of iron weighs …………….. grams.(b) 7.4 mole of iron contains …………… atoms.(c) 7.4 moles of iron weighs ……………. grams.(d) 1 gram of iron contains ……………... atoms.(e) 1 atom of iron weighs ………………. grams.(f) 1.2 × 1024 atoms of iron would be …………….. moles of iron.(g) 1.2 × 1024 atoms of iron weigh …………….. grams.

Answer»

Atomic number (Z) of Iron, Fe is 26, Atomic mass 56. Using the above information answer the following.

(a) 1 mole of iron weighs …………….. grams.

(b) 7.4 mole of iron contains …………… atoms.

(c) 7.4 moles of iron weighs ……………. grams.

(d) 1 gram of iron contains ……………... atoms.

(e) 1 atom of iron weighs ………………. grams.

(f) 1.2 × 10²⁴ atoms of iron would be …………….. moles of iron.

(g) 1.2 × 10²⁴ atoms of iron weigh …………….. grams.

Discussion

1821.	Which of the following metals has more than five unpaired electrons in it?
Answer» Which of the following metals has more than five unpaired electrons in it?

Discussion

1822.	Which one of the following noble gas is not found in the atmosphere ?
Answer» Which one of the following noble gas is not found in the atmosphere ?

Discussion

1823.	Why is the weight of product greater than the reactants when the reactants are burnt ??
Answer» Why is the weight of product greater than the reactants when the reactants are burnt ??

Discussion

1824.	Explain isotopes and isobars.
Answer» Explain isotopes and isobars.

Discussion

1825.	the ionisation energy of h-atom (in ground state ) is x kj . the energy required for electron to jump from 2nd to 3rd orbit is
Answer» the ionisation energy of h-atom (in ground state ) is x kj . the energy required for electron to jump from 2nd to 3rd orbit is

Discussion

1826.	An aqueous solution of urea has a freezing point of -0.515 C.Predict the osmotic pressure of the same solution at 37 C.
Answer» An aqueous solution of urea has a freezing point of -0.515 C.Predict the osmotic pressure of the same solution at 37 C.

Discussion

1827.	What is a chemical equation?
Answer» What is a chemical equation?

Discussion

1828.	(a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution.(b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.
Answer» (a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution. (b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.

Discussion

1829.	17. What is the order of solubility among the chloride of 1st A Group ?
Answer» 17. What is the order of solubility among the chloride of 1st A Group ?

Discussion

1830.	What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide (FeS)?
Answer» What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide (FeS)?

Discussion

1831.	If 2 degree celsius rise in temperature takes place on the combustion of 0.1 g of methane gas in bomb calorimeter having heat capacity =500J/^° c at 27 ^° c, then value of heat of combustion at cons†an t pressure for one mole gas
Answer» If 2 degree celsius rise in temperature takes place on the combustion of 0.1 g of methane gas in bomb calorimeter having heat capacity =500J/^° c at 27 ^° c, then value of heat of combustion at cons†an t pressure for one mole gas

Discussion

1832.	why does the temparature of the solution increase when zinc rod start dissolving in copper sulphate?
Answer» why does the temparature of the solution increase when zinc rod start dissolving in copper sulphate?

Discussion

1833.	Fill in the following blanks with suitable words : (a) Gases can be liquefied by applying ______and lowering______ (b) When steam condenses to form water, heat is ______ (c) Temp on Kelvin scale = Temp on Celsius scale +______ (d) Scientists say that there are actually five states of matter :solid, liquid, gas,______and______ (e) The state of matter called ______makes a fluorescent tube (or neon sign bulb) to glow
Answer» Fill in the following blanks with suitable words : (a) Gases can be liquefied by applying ______and lowering______ (b) When steam condenses to form water, heat is ______ (c) Temp on Kelvin scale = Temp on Celsius scale +______ (d) Scientists say that there are actually five states of matter :solid, liquid, gas,______and______ (e) The state of matter called ______makes a fluorescent tube (or neon sign bulb) to glow

1833.

Fill in the following blanks with suitable words : (a) Gases can be liquefied by applying and lowering (b) When steam condenses to form water, heat is (c) Temp on Kelvin scale = Temp on Celsius scale + (d) Scientists say that there are actually five states of matter :solid, liquid, gas,and (e) The state of matter called __makes a fluorescent tube (or neon sign bulb) to glow

Answer»

Fill in the following blanks with suitable words :

(a) Gases can be liquefied by applying ______and lowering______

(b) When steam condenses to form water, heat is ______

(c) Temp on Kelvin scale = Temp on Celsius scale +______

(d) Scientists say that there are actually five states of matter :solid, liquid, gas,______and______

(e) The state of matter called ______makes a fluorescent tube (or neon sign bulb) to glow

Discussion

1834.	Mother had placed some moth balls in the clothes. But the moth balls disappeared after few days. Which property of matter is witnessed in this example?
Answer» Mother had placed some moth balls in the clothes. But the moth balls disappeared after few days. Which property of matter is witnessed in this example?

Discussion

1835.	Which of the following is/are example(s) of hydrogen bonded molecular solids?
Answer» Which of the following is/are example(s) of hydrogen bonded molecular solids?

Discussion

1836.	The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?
Answer» The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8} H_{7} S O_{3} N a$ (molecular weight = 206). What would be the maximum uptake of $C a^{2 +}$ ions by the resin when expressed in mole per gram resin?

Discussion

1837.	The number of electrons that can be accommodated in any energy level is given by ________
Answer» The number of electrons that can be accommodated in any energy level is given by ________

Discussion

1838.	Which of the following is a method of preparation of CO?
Answer» Which of the following is a method of preparation of CO?

Discussion

1839.	Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:a) Write a balanced chemical equation for the reaction taking place.b) What will be the action of the gas on moist blue litmus paper?
Answer» Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: a) Write a balanced chemical equation for the reaction taking place. b) What will be the action of the gas on moist blue litmus paper?

1839.

Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:a) Write a balanced chemical equation for the reaction taking place.b) What will be the action of the gas on moist blue litmus paper?

Answer»

Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

a) Write a balanced chemical equation for the reaction taking place.

b) What will be the action of the gas on moist blue litmus paper?

Discussion

1840.	Classify the following as elements or compound : Iron , Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Answer» Classify the following as elements or compound : Iron , Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

1840.

Classify the following as elements or compound : Iron , Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

Answer»

Classify the following as elements or compound :

Iron , Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

Discussion

1841.	WHAT IS THE REACTION WHEN TWO EQUIVALENT ACIDS REACT WITH ONE EQUIVALENT BASE?
Answer» WHAT IS THE REACTION WHEN TWO EQUIVALENT ACIDS REACT WITH ONE EQUIVALENT BASE?

Discussion

1842.	how to find out that a compound is a good reducing agent?
Answer» how to find out that a compound is a good reducing agent?

Discussion

1843.	Question 22.Which of the following is not a mineral acid?(a) Hydrochloric acid(b) Citric acid(c) Sulphuric acid(d) Nitric acid
Answer» Question 22. Which of the following is not a mineral acid? (a) Hydrochloric acid (b) Citric acid (c) Sulphuric acid (d) Nitric acid

Discussion

1844.	State the number of atoms present in each of the following chemical species(a) CO2−3(b) PO3−4(c) P2O5(d) CO
Answer» State the number of atoms present in each of the following chemical species (a) $C O_{3}^{2 -}$ (b) $P O_{4}^{3 -}$ (c) $P_{2} O_{5}$ (d) $C O$

Discussion

1845.	Question 1(i) What is the nature of carbon?(ii) What is the electronic structure of carbon?
Answer» Question 1 (i) What is the nature of carbon? (ii) What is the electronic structure of carbon?

1845.

Question 1(i) What is the nature of carbon?(ii) What is the electronic structure of carbon?

Answer»

Question 1

(i) What is the nature of carbon?

(ii) What is the electronic structure of carbon?

Discussion

1846.	a source S1 is priducing 10^{15} photons per second of wavelength 50000A. another source S2 is producing 1.02×10^{15} photons per second of wavelength 5100A. then power of S/power of S
Answer» a source S1 is priducing 10^{15} photons per second of wavelength 50000A. another source S2 is producing 1.02×10^{15} photons per second of wavelength 5100A. then power of S/power of S

Discussion

1847.	From the given table what relationship can you infer about the species X and Y?
Answer» From the given table what relationship can you infer about the species X and Y?

1847.

From the given table what relationship can you infer about the species X and Y?

Answer»

From the given table what relationship can you infer about the species X and Y?

Discussion

1848.	How does ice get converted into water?
Answer» How does ice get converted into water?

Discussion

1849.	Cathode rays carry ___ charge.
Answer» Cathode rays carry ___ charge.

Discussion

1850.	Which of the following are the properties of a solution?
Answer» Which of the following are the properties of a solution?

Discussion

Explore topic-wise InterviewSolutions in .

Q 8/15 The density of ice is y g/L and that of water isx g/L. What is the change in volume when m gram ofice melts?

_______ is the introduction of contaminants into the natural environment causing adverse changes in it.

Which of the following represents Volume - Pressure graph for Ideal gas?

How does NH3 and HCl gases reacts as acid reacts in aquous meadium

1. If a element has a total of 20 electrons then why does it full it's 3rd shell with only 8 electrons and not 10 when 18 can be accommodated in the 3rd shell 2. If a element with electronic configuration 2,8,8,2 gains more electrons which shell well it start filling the 3rd or the 2nd

One litre of a gas at 10∘C is heated till both its volume and pressure are tripled. Find the new temperature.

Is diamond pure?

The oxidizing properties of Nitric Acid is due to

14 What is the diffrence between atom and molecule

In what ratio by mass the gases CO and 2-butene be mixed in a vessel so that they same partial pressure

In 250 g of an aqueous sugar solution, 5 g of sugar is present. Calculate the percentage composition (w/w) of the mixture.

Write the electronic configuration of the following elements.Na, Mg, Al, and Si.

(a) What is the action of red litmus on: (i) Dry ammonia gas (ii) Solution of ammonia gas in water (b)State the observations when ammonium hydroxide is added to the aqueous solution of: (i) Ferrous sulphate (ii) Aluminium chloride.

(a) Define valency of an element. What valency will be shown by an element having atomic number 14?​(b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.

10. why phosphorous exist as P4 molecule?d=

One mole of N2 gas at 0.8 ATM takes 38 sec to diffuse through a pin hole, where as one mole of an unknown compound of Xenon with F at 1.6 ATM takes 57 sec to diffuse through the same hole. Calculate the molecular formula of the compound

a gaseous mixture contains one mole of gas A (monatomic) and another gas B (diatomic) at same temperature . Find the number of moles of B if Gamma for the mixture is 19/13.

Which of the following metals has more than five unpaired electrons in it?

Which one of the following noble gas is not found in the atmosphere ?

Why is the weight of product greater than the reactants when the reactants are burnt ??

Explain isotopes and isobars.

the ionisation energy of h-atom (in ground state ) is x kj . the energy required for electron to jump from 2nd to 3rd orbit is

An aqueous solution of urea has a freezing point of -0.515 C.Predict the osmotic pressure of the same solution at 37 C.

What is a chemical equation?

(a) What do you mean by the concentration of a solution? Discuss any three methods of expressing the concentration of a solution.(b) A solution contains 30 g of sugar dissolved in 300 g of water. Calculate the concentration of this solution.

17. What is the order of solubility among the chloride of 1st A Group ?

What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide (FeS)?

If 2 degree celsius rise in temperature takes place on the combustion of 0.1 g of methane gas in bomb calorimeter having heat capacity =500J/^° c at 27 ^° c, then value of heat of combustion at cons†an t pressure for one mole gas

why does the temparature of the solution increase when zinc rod start dissolving in copper sulphate?

Mother had placed some moth balls in the clothes. But the moth balls disappeared after few days. Which property of matter is witnessed in this example?

Which of the following is/are example(s) of hydrogen bonded molecular solids?

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?

The number of electrons that can be accommodated in any energy level is given by ________

Which of the following is a method of preparation of CO?

Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:a) Write a balanced chemical equation for the reaction taking place.b) What will be the action of the gas on moist blue litmus paper?

Classify the following as elements or compound : Iron , Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

WHAT IS THE REACTION WHEN TWO EQUIVALENT ACIDS REACT WITH ONE EQUIVALENT BASE?

how to find out that a compound is a good reducing agent?

Question 22.Which of the following is not a mineral acid?(a) Hydrochloric acid(b) Citric acid(c) Sulphuric acid(d) Nitric acid

State the number of atoms present in each of the following chemical species(a) CO2−3(b) PO3−4(c) P2O5(d) CO

Question 1(i) What is the nature of carbon?(ii) What is the electronic structure of carbon?

a source S1 is priducing 10^{15} photons per second of wavelength 50000A. another source S2 is producing 1.02×10^{15} photons per second of wavelength 5100A. then power of S/power of S

From the given table what relationship can you infer about the species X and Y?

How does ice get converted into water?

Cathode rays carry ___ charge.

Which of the following are the properties of a solution?

(a) Define valency of an element. What valency will be shown by an element having atomic number 14?(b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.