10223 + Interview Questions in Chemistry Page 80 InterviewSolution

3951.	Difference between mixture and compound.
Answer» Difference between mixture and compound.

Discussion

3952.	Are stoichiometric coefficient and number of moles same?
Answer» Are stoichiometric coefficient and number of moles same?

Discussion

3953.	Which of the following metals does not produce hydrogen gas when added to acid?
Answer» Which of the following metals does not produce hydrogen gas when added to acid?

Discussion

3954.	PCl5 ------ PCl3 + Cl22 mol 2mol 2 mol (given)If 1 mole of PCl3(g) is added to the above system , find moles of all gases at new equilibrium. Also find Kc ?
Answer» PCl5 ------ PCl3 + Cl2 2 mol 2mol 2 mol (given) If 1 mole of PCl3(g) is added to the above system , find moles of all gases at new equilibrium. Also find Kc ?

Discussion

3955.	State whether the following statements are true or false. In case a statement is false, write the corrected statement.a. Cutting a log of wood into pieces is a chemical change.b. Formation of manure from leaves is a physical change.c. Iron pipes coated with zinc do not get rusted easily.d. Iron and rust are the same substances.e. Condensation of steam is not a chemical change.
Answer» State whether the following statements are true or false. In case a statement is false, write the corrected statement. a. Cutting a log of wood into pieces is a chemical change. b. Formation of manure from leaves is a physical change. c. Iron pipes coated with zinc do not get rusted easily. d. Iron and rust are the same substances. e. Condensation of steam is not a chemical change.

Discussion

3956.	How many metal nitrides among the following will produce ammonia on hydrolysis?AlN,Mg3N2,Li3N,Ba3N2,Ca3N2
Answer» How many metal nitrides among the following will produce ammonia on hydrolysis? $A l N, M g_{3} N_{2}, L i_{3} N, B a_{3} N_{2}, C a_{3} N_{2}$

Discussion

3957.	The ratio of density of a substance to density of water at 4°C is usually referred as ___.
Answer» The ratio of density of a substance to density of water at 4°C is usually referred as ___.

Discussion

3958.	0.5 moles of water molecules.
Answer» 0.5 moles of water molecules.

Discussion

3959.	Question 31The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?
Answer» Question 31 The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Discussion

3960.	the wavelength of a photon in nm having energy of 3.083×10raise to the power 12 in joule i
Answer» the wavelength of a photon in nm having energy of 3.083×10raise to the power 12 in joule i

Discussion

3961.	How can you distinguish between dilute HCl and dilute HNO3?
Answer» How can you distinguish between $d i l u t e H C l$ and $d i l u t e H N O_{3}$ ?

Discussion

3962.	What is the number of oxygen atoms present in 126 g of HNO3?
Answer» What is the number of oxygen atoms present in 126 g of ${H N O}_{3}$ ?

Discussion

3963.	Why is CNG better than diesel?
Answer» Why is CNG better than diesel?

Discussion

3964.	Isotopes of the same element have
Answer» Isotopes of the same element have

Discussion

3965.	What is the number of pairs of ion which are coloured in aqueous solution?(i) Ti3+,V3+ (ii)Cu+,Sc3+ (iii)Fe2+,Fe3+ (iv)Co2+,Ni2+ (v)Zn2+,Ag+
Answer» What is the number of pairs of ion which are coloured in aqueous solution? (i) $T i^{3 +}, V^{3 +} (i i) C u^{+}, S c^{3 +} (i i i) F e^{2 +}, F e^{3 +} (i v) C o^{2 +}, N i^{2 +} (v) Z n^{2 +}, A g^{+}$

Discussion

3966.	Question 22 Why did Rutherford select a gold foil in his alpha-ray scattering experiment?
Answer» Question 22 Why did Rutherford select a gold foil in his alpha-ray scattering experiment?

Discussion

3967.	Which one of the following ions has same number of unpaired electrons as that of v3+ ions A)cr3+ B)mn2+ C)ni2+ D)fe3+
Answer» Which one of the following ions has same number of unpaired electrons as that of v3+ ions A)cr3+ B)mn2+ C)ni2+ D)fe3+

Discussion

3968.	What is the difference between displacement reaction and double displacement reaction?
Answer» What is the difference between displacement reaction and double displacement reaction?

Discussion

3969.	Question 11.Common salt besides being used in kitchen can also be used as the raw material for making(i) washing soda(ii) bleaching powder(iii) baking soda(iv) slaked limeChoose the correct option from the following:(a) (i) and (ii) (b) (i), (ii) and (iv)(c) (i) and (iii) (d) (i), (iii) and (iv)
Answer» Question 11. Common salt besides being used in kitchen can also be used as the raw material for making (i) washing soda (ii) bleaching powder (iii) baking soda (iv) slaked lime Choose the correct option from the following: (a) (i) and (ii) (b) (i), (ii) and (iv) (c) (i) and (iii) (d) (i), (iii) and (iv)

Discussion

3970.	31. For the equilibrium of the reaction (p=total pressure) : HgO (s) Hg(g) + 1/2O2(g) Find Kp
Answer» 31. For the equilibrium of the reaction (p=total pressure) : HgO (s) <=> Hg(g) + 1/2O2(g) Find Kp

Discussion

3971.	It is advised to cool the nitric acid vapours with cold water after preparation, as it is
Answer» It is advised to cool the nitric acid vapours with cold water after preparation, as it is

Discussion

3972.	An electron in hydrogen atom falls from sixth excited state to first excited state. Total possible lines emitted in the visible region are - 1)zero 2)15 3)5 4)21
Answer» An electron in hydrogen atom falls from sixth excited state to first excited state. Total possible lines emitted in the visible region are - 1)zero 2)15 3)5 4)21

Discussion

3973.	In the compoud FeSO4 the oxidation state of Iron is Fe2+. So, shouldn't its electronic configuration be 4s1 3d5 as half filled subshells are more stable but rather it is shown that it has the configuration 4s0 3d6 / Why is it so ?
Answer» In the compoud FeSO4 the oxidation state of Iron is Fe2+. So, shouldn't its electronic configuration be 4s1 3d5 as half filled subshells are more stable but rather it is shown that it has the configuration 4s0 3d6 / Why is it so ?

Discussion

3974.	Why does tetragonal crystal system not have face centred unit?
Answer» Why does tetragonal crystal system not have face centred unit?

Discussion

3975.	Select the correct answer : (a) Excessive release of carbon dioxide in the atmosphere is the cause of (i) Depletion of ozone
Answer» Select the correct answer : (a) Excessive release of carbon dioxide in the atmosphere is the cause of (i) Depletion of ozone

3975.

Select the correct answer : (a) Excessive release of carbon dioxide in the atmosphere is the cause of (i) Depletion of ozone

Answer»

Select the correct answer :

(a) Excessive release of carbon dioxide in the atmosphere is the cause of

(i) Depletion of ozone

Discussion

3976.	Which substances are incorrectly placed in the following table?
Answer» Which substances are incorrectly placed in the following table?

Discussion

3977.	How many number of neutrons are there in 3717Cl?20
Answer» How many number of neutrons are there in $_{17}^{37} C l$ ? 20

Discussion

3978.	The relative density of a material of a body is found by weighing it first in air and then in water. If the weight of the body in air is W1 = 8.00 ± 0.05 N and the weight in water is W2 = 6.00 ± 0.05 N then the relative density =W1/(W1-W2) with the maximum permissible error is
Answer» The relative density of a material of a body is found by weighing it first in air and then in water. If the weight of the body in air is W1 = 8.00 ± 0.05 N and the weight in water is W2 = 6.00 ± 0.05 N then the relative density =W1/(W1-W2) with the maximum permissible error is

Discussion

3979.	how compounds are form?
Answer» how compounds are form?

Discussion

3980.	Calculate the relative molecular mass of carbon dioxide (CO2) .
Answer» Calculate the relative molecular mass of carbon dioxide (CO₂) .

Discussion

3981.	how to convert one graph into another graph.eg vt graph into at graph?
Answer» how to convert one graph into another graph.eg vt graph into at graph?

Discussion

3982.	How nascent hydrogen is produced?Methods to produce dihydrogen and its detailed process?
Answer» How nascent hydrogen is produced? Methods to produce dihydrogen and its detailed process?

Discussion

3983.	describe brifely about ''n factor" & &quotequivalent weight".
Answer» describe brifely about ''n factor" & "equivalent weight".

Discussion

3984.	Anode rays are formed because of perforated cathode?
Answer» Anode rays are formed because of perforated cathode?

Discussion

3985.	Calculate the volume occupied by 2 g of hydrogen at 27∘C and 4 atmosphere pressure, if at S.T.P. it occupies 22.4 litres.
Answer» Calculate the volume occupied by 2 g of hydrogen at $27^{\circ} C$ and 4 atmosphere pressure, if at S.T.P. it occupies 22.4 litres.

Discussion

3986.	83.A 0.2 molar solution of formic acid is 3.2% ionized its ionisation constant is
Answer» 83.A 0.2 molar solution of formic acid is 3.2% ionized its ionisation constant is

Discussion

3987.	Explain the phenomenon behind evaporation.
Answer» Explain the phenomenon behind evaporation.

Discussion

3988.	Why do rivers and lakes not freeze easily ?
Answer» Why do rivers and lakes not freeze easily ?

Discussion

3989.	How 2d motion speed formula different from 3d speed formula.
Answer» How 2d motion speed formula different from 3d speed formula.

Discussion

3990.	Which of the following compounds is formed by ionic bonding?
Answer» Which of the following compounds is formed by ionic bonding?

Discussion

3991.	12. Calculate the mass of (NH4)2SO4 in gram which must be added to 500 ml 0.2M NH3 to form a buffer of ph 9.3. Pkb= 4.7
Answer» 12. Calculate the mass of (NH4)2SO4 in gram which must be added to 500 ml 0.2M NH3 to form a buffer of ph 9.3. Pkb= 4.7

Discussion

3992.	What willbe the mass of one 12C atom in g?
Answer» What will be the mass of one ¹²C atom in g?

Discussion

3993.	3x2 Consider the following statements.(a) 1 g of N, and 1 g of O, contain same numberof nucleons(b) Non-stoichiometric compounds do not followlaw of definite proportions(c) Equivalent weight of Cu is same in Cu O andCorrect statement(s) among the following is/are(1) (a) & (c)(4) (a) only(q) 8 (e) e
Answer» 3x 2 Consider the following statements. (a) 1 g of N, and 1 g of O, contain same number of nucleons (b) Non-stoichiometric compounds do not follow law of definite proportions (c) Equivalent weight of Cu is same in Cu O and Correct statement(s) among the following is/are (1) (a) & (c) (4) (a) only (q) 8 (e) e

Discussion

3994.	800cm3 of gas is collected at 650 mm pressure. At what pressure would the volume of the gas reduce by 40% of its original volume, temperature remaining constant?
Answer» $800 c m^{3}$ of gas is collected at 650 mm pressure. At what pressure would the volume of the gas reduce by 40% of its original volume, temperature remaining constant?

Discussion

3995.	1. How many spectral lines are seen for hydrogen atom when electron jump from n=5 to n=1 in visible region. but visible is when electron comes to n=2 so in this how visible possible ?
Answer» 1. How many spectral lines are seen for hydrogen atom when electron jump from n=5 to n=1 in visible region. but visible is when electron comes to n=2 so in this how visible possible ?

Discussion

3996.	What is valocity and speed?
Answer» What is valocity and speed?

Discussion

3997.	How many periods, series and groups are present in mendeleev periodic table? Is both series and periods are same? Or series are sub-periods?
Answer» How many periods, series and groups are present in mendeleev periodic table? Is both series and periods are same? Or series are sub-periods?

Discussion

3998.	NaOH is a strong base because
Answer» NaOH is a strong base because

Discussion

3999.	A compound X is used in making chloromethane as shown below. Identify X. X + Cl2 250 °C − 400 °C−−−−−−−−−→UV light CH3Cl + HCl
Answer» A compound X is used in making chloromethane as shown below. Identify X. $X + {Cl}_{2} 250 ° C - 400 ° C - -------- \to UV light {CH}_{3} Cl + HCl$

Discussion

4000.	Why do some elements have more than one valency ?
Answer» Why do some elements have more than one valency ?

Discussion

Explore topic-wise InterviewSolutions in .

Difference between mixture and compound.

Are stoichiometric coefficient and number of moles same?

Which of the following metals does not produce hydrogen gas when added to acid?

PCl5 ------ PCl3 + Cl22 mol 2mol 2 mol (given)If 1 mole of PCl3(g) is added to the above system , find moles of all gases at new equilibrium. Also find Kc ?

How many metal nitrides among the following will produce ammonia on hydrolysis?AlN,Mg3N2,Li3N,Ba3N2,Ca3N2

The ratio of density of a substance to density of water at 4°C is usually referred as ___.

0.5 moles of water molecules.

Question 31The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

the wavelength of a photon in nm having energy of 3.083×10raise to the power 12 in joule i

How can you distinguish between dilute HCl and dilute HNO3?

What is the number of oxygen atoms present in 126 g of HNO3?

Why is CNG better than diesel?

Isotopes of the same element have

What is the number of pairs of ion which are coloured in aqueous solution?(i) Ti3+,V3+ (ii)Cu+,Sc3+ (iii)Fe2+,Fe3+ (iv)Co2+,Ni2+ (v)Zn2+,Ag+

Question 22 Why did Rutherford select a gold foil in his alpha-ray scattering experiment?

Which one of the following ions has same number of unpaired electrons as that of v3+ ions A)cr3+ B)mn2+ C)ni2+ D)fe3+

What is the difference between displacement reaction and double displacement reaction?

Question 11.Common salt besides being used in kitchen can also be used as the raw material for making(i) washing soda(ii) bleaching powder(iii) baking soda(iv) slaked limeChoose the correct option from the following:(a) (i) and (ii) (b) (i), (ii) and (iv)(c) (i) and (iii) (d) (i), (iii) and (iv)

31. For the equilibrium of the reaction (p=total pressure) : HgO (s) Hg(g) + 1/2O2(g) Find Kp

It is advised to cool the nitric acid vapours with cold water after preparation, as it is

An electron in hydrogen atom falls from sixth excited state to first excited state. Total possible lines emitted in the visible region are - 1)zero 2)15 3)5 4)21

In the compoud FeSO4 the oxidation state of Iron is Fe2+. So, shouldn't its electronic configuration be 4s1 3d5 as half filled subshells are more stable but rather it is shown that it has the configuration 4s0 3d6 / Why is it so ?

Why does tetragonal crystal system not have face centred unit?

Select the correct answer : (a) Excessive release of carbon dioxide in the atmosphere is the cause of (i) Depletion of ozone

Which substances are incorrectly placed in the following table?

How many number of neutrons are there in 3717Cl?20

The relative density of a material of a body is found by weighing it first in air and then in water. If the weight of the body in air is W1 = 8.00 ± 0.05 N and the weight in water is W2 = 6.00 ± 0.05 N then the relative density =W1/(W1-W2) with the maximum permissible error is

how compounds are form?

Calculate the relative molecular mass of carbon dioxide (CO2) .

how to convert one graph into another graph.eg vt graph into at graph?

How nascent hydrogen is produced?Methods to produce dihydrogen and its detailed process?

describe brifely about ''n factor" & &quotequivalent weight".

Anode rays are formed because of perforated cathode?

Calculate the volume occupied by 2 g of hydrogen at 27∘C and 4 atmosphere pressure, if at S.T.P. it occupies 22.4 litres.

83.A 0.2 molar solution of formic acid is 3.2% ionized its ionisation constant is

Explain the phenomenon behind evaporation.

Why do rivers and lakes not freeze easily ?

How 2d motion speed formula different from 3d speed formula.

Which of the following compounds is formed by ionic bonding?

12. Calculate the mass of (NH4)2SO4 in gram which must be added to 500 ml 0.2M NH3 to form a buffer of ph 9.3. Pkb= 4.7

What willbe the mass of one 12C atom in g?

3x2 Consider the following statements.(a) 1 g of N, and 1 g of O, contain same numberof nucleons(b) Non-stoichiometric compounds do not followlaw of definite proportions(c) Equivalent weight of Cu is same in Cu O andCorrect statement(s) among the following is/are(1) (a) & (c)(4) (a) only(q) 8 (e) e

800cm3 of gas is collected at 650 mm pressure. At what pressure would the volume of the gas reduce by 40% of its original volume, temperature remaining constant?

1. How many spectral lines are seen for hydrogen atom when electron jump from n=5 to n=1 in visible region. but visible is when electron comes to n=2 so in this how visible possible ?

What is valocity and speed?

How many periods, series and groups are present in mendeleev periodic table? Is both series and periods are same? Or series are sub-periods?

NaOH is a strong base because

A compound X is used in making chloromethane as shown below. Identify X. X + Cl2 250 °C − 400 °C−−−−−−−−−→UV light CH3Cl + HCl

Why do some elements have more than one valency ?