46295 + Interview Questions in Chemistry

1.	Gastric juice contains 3.0g of HCl per litre. If a person produces 2.44 litre of gastric juice per day. How many antacid tablets each containing 400 mg of Al(OH)3 are needed to neutralize all the HCl produced in one day? Choose the nearest answer.
Answer» Gastric juice contains 3.0g of $H C l$ per litre. If a person produces 2.44 litre of gastric juice per day. How many antacid tablets each containing 400 mg of $A l$ ( $O H)_{3}$ are needed to neutralize all the $H C l$ produced in one day? Choose the nearest answer.

Discussion

2.	The table shown below gives the bond dissociation energies (Edis) for single covalent bonds of carbon (C) atoms with element ′A′, ′B′, ′C′ and ′D′. Which element has the smallest atoms? BondEdis(kJ mol−1)C−A240C−B328C−C276C−D485
Answer» The table shown below gives the bond dissociation energies $(E_{d i s})$ for single covalent bonds of carbon $(C)$ atoms with element $^{'} A^{'},^{'} B^{'},^{'} C^{'}$ and $^{'} D^{'}$ . Which element has the smallest atoms? $\begin{matrix} Bond & E_{d i s} ({kJ mol}^{- 1}) C - A & 240 C - B & 328 C - C & 276 C - D & 485 \end{matrix}$

Discussion

3.	which set has different class of compounds?
Answer» which set has different class of compounds?

Discussion

4.	64. The order of screening effect of electrons of s p d and f orbital of a given shell of an atom on it outer shell electrons is a. s>p>d>f b. f>d>p>s c. pp>s>d
Answer» 64. The order of screening effect of electrons of s p d and f orbital of a given shell of an atom on it outer shell electrons is a. s>p>d>f b. f>d>p>s c. pp>s>d

Discussion

5.	What is difference between mole and molecule?
Answer» What is difference between mole and molecule?

Discussion

6.	Question 8:Assertion: The impure salt can be purified by the crystallization process.Reason: The process of crystallization is an example of physical change.
Answer» Question 8: Assertion: The impure salt can be purified by the crystallization process. Reason: The process of crystallization is an example of physical change.

6.

Question 8:Assertion: The impure salt can be purified by the crystallization process.Reason: The process of crystallization is an example of physical change.

Answer»

Question 8:

Assertion: The impure salt can be purified by the crystallization process.

Reason: The process of crystallization is an example of physical change.

Discussion

7.	The electronic configuration of chromium in [Cr(NH3)6]3+ is:
Answer» The electronic configuration of chromium in [Cr(NH₃)₆]³⁺ is:

Discussion

8.	In the electrolysis of a CuSO4 solution, how many grams of Cu are plated out on the cathode in the time that it takes to liberate 5.6 litre of O2, measured at STP, at the anode? (a)31.75 (b) 14.2 (c)4.32 (d)25.2
Answer» In the electrolysis of a CuSO4 solution, how many grams of Cu are plated out on the cathode in the time that it takes to liberate 5.6 litre of O2, measured at STP, at the anode? (a)31.75 (b) 14.2 (c)4.32 (d)25.2

Discussion

9.	C2H2 + HOCl ----> what is the major product of the reaction
Answer» C2H2 + HOCl ----> what is the major product of the reaction

Discussion

10.	An aqueous solution of carbonic acid (H2CO3) contains
Answer» An aqueous solution of carbonic acid ( $H_{2} C O_{3}$ ) contains

Discussion

11.	Element Fe has two oxidation states Fe2+ & Fe3+, the correct order of radii of these ions will be:
Answer» Element $F e$ has two oxidation states $F e^{2 +}$ & $F e^{3 +}$ , the correct order of radii of these ions will be:

Discussion

12.	why s has more negative electron gain enthalpythan o
Answer» why s has more negative electron gain enthalpythan o

Discussion

13.	A perfect gas at 27∘C is heated at constant pressure so as to triple its volume. The temperature of the gas will be
Answer» A perfect gas at $27^{\circ} C$ is heated at constant pressure so as to triple its volume. The temperature of the gas will be

13.

A perfect gas at 27∘C is heated at constant pressure so as to triple its volume. The temperature of the gas will be

Answer»

A perfect gas at $27^{\circ} C$ is heated at constant pressure so as to triple its volume. The temperature of the gas will be

Discussion

14.	If 20 mL of a 0.1 M NaOH is added to 30 mL of 0.2M CH3COOH (pka=4.74), the pH of the resulting solutiin is
Answer» If 20 mL of a 0.1 M NaOH is added to 30 mL of 0.2M CH3COOH (pka=4.74), the pH of the resulting solutiin is

Discussion

15.	0.56 litre each of three samples of H2O2 labelled as 10 vol, 15 vol and 20 vol are mixed. The resultant normality of H2O2 solution is:
Answer» $0.56$ litre each of three samples of $H_{2} O_{2}$ labelled as $10 v o l, 15 v o l$ and $20 v o l$ are mixed. The resultant normality of $H_{2} O_{2}$ solution is:

Discussion

16.	[Co(en)2(NH3)Cl]2+ is known to be a diamagnetic complex. What is the type of hybridisation it shows ?
Answer» $[C o (e n)_{2} (N H_{3}) C l]^{2 +}$ is known to be a diamagnetic complex. What is the type of hybridisation it shows ?

Discussion

17.	Phenol is:
Answer» Phenol is:

Discussion

18.	how to calculate coordinatation number in s.c , f.c.c and b.c.c
Answer» how to calculate coordinatation number in s.c , f.c.c and b.c.c

Discussion

19.	When KMnO4 acts as an oxidizing agent and ultimately formsMnO−24 ,MnO2 ,Mn2O3 andMn+2 , then the number of electrons transferred ( per Mn atom) in each case respectively is:
Answer» When $K M n O_{4}$ acts as an oxidizing agent and ultimately forms $M n O_{4}^{- 2}$ , $M n O_{2}$ , $M n_{2} O_{3}$ and $M n^{+ 2}$ , then the number of electrons transferred ( per Mn atom) in each case respectively is:

Discussion

20.	The mass of a certain nucleus X4 is less than that of its constituent particles by 0.03 u. The binding energy per nucleon of X4 nucleus will be
Answer» The mass of a certain nucleus $X^{4}$ is less than that of its constituent particles by $0.03 u$ . The binding energy per nucleon of $X^{4}$ nucleus will be

Discussion

21.	18 g of glucose (C6H12O6) is added to 178.2 g water at 760 torr. The vapour pressure of water (in torr) for this aqueous solution is:
Answer» $18 g$ of glucose $(C_{6} H_{12} O_{6})$ is added to $178.2 g$ water at $760$ torr. The vapour pressure of water (in torr) for this aqueous solution is:

Discussion

22.	Why is SI unit of work is Joule and SI unit of Moment of force(torque) different since both apparently have same formula except in moment of force it is perpendicular distance and in work it is only distance
Answer» Why is SI unit of work is Joule and SI unit of Moment of force(torque) different since both apparently have same formula except in moment of force it is perpendicular distance and in work it is only distance

Discussion

23.	Can the following groups of elements be classified as Dobereiner’s triads?(a) Na, Si, Cl (b) Be, Mg, CaGive the reason for your answer.(Atomic masses : Be = 9; Na = 23; Mg = 24 ; Si = 28 ; Cl = 35.5; Ca = 40)
Answer» Can the following groups of elements be classified as Dobereiner’s triads? (a) Na, Si, Cl (b) Be, Mg, Ca Give the reason for your answer. (Atomic masses : Be = 9; Na = 23; Mg = 24 ; Si = 28 ; Cl = 35.5; Ca = 40)

23.

Can the following groups of elements be classified as Dobereiner’s triads?(a) Na, Si, Cl (b) Be, Mg, CaGive the reason for your answer.(Atomic masses : Be = 9; Na = 23; Mg = 24 ; Si = 28 ; Cl = 35.5; Ca = 40)

Answer»

Can the following groups of elements be classified as Dobereiner’s triads?

(a) Na, Si, Cl (b) Be, Mg, Ca

Give the reason for your answer.

(Atomic masses : Be = 9; Na = 23; Mg = 24 ; Si = 28 ; Cl = 35.5; Ca = 40)

Discussion

24.	Is it possible to have an element with atomic number 1.5 placed between hydrogen and helium?
Answer» Is it possible to have an element with atomic number 1.5 placed between hydrogen and helium?

Discussion

25.	What is the net reaction in Hall-Heroult process?
Answer» What is the net reaction in Hall-Heroult process?

Discussion

26.	I need a help to know the SI unit of weight.
Answer» I need a help to know the SI unit of weight.

Discussion

27.	The total pressure of a mixture of 6.4 grams of oxygen and 5.6 grams of nitrogen present in a 2 lit vessel is 1200mm. What is the partial pressure of nitrogen in mm?
Answer» The total pressure of a mixture of 6.4 grams of oxygen and 5.6 grams of nitrogen present in a 2 lit vessel is 1200mm. What is the partial pressure of nitrogen in mm?

Discussion

28.	What volume of 5 molar Na2So4 must be added to 25 ml of 1 molar of bacl2 to produce 10 gram of b a s o4
Answer» What volume of 5 molar Na2So4 must be added to 25 ml of 1 molar of bacl2 to produce 10 gram of b a s o4

Discussion

29.	95.What are enolizable hydrogen and alpha carbon?
Answer» 95.What are enolizable hydrogen and alpha carbon?

Discussion

30.	When MnO2 is fused with KOH a coloured compound is formed. The product and its colour are
Answer» When MnO₂ is fused with KOH a coloured compound is formed. The product and its colour are

Discussion

31.	Which one of the following statement(s) is/are not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
Answer» Which one of the following statement(s) is/are not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

Discussion

32.	Which of the following trend is/are correct?
Answer» Which of the following trend is/are correct?

Discussion

33.	What are D and L in Amino acids?
Answer» What are D and L in Amino acids?

Discussion

34.	ntMaximum value (n+l+m) for unpaired electrons in second excited state of chlorine 17Cl isn nt28n nt25n nt20n ntNonen
Answer» ntMaximum value (n+l+m) for unpaired electrons in second excited state of chlorine 17Cl isn nt28n nt25n nt20n ntNonen

Discussion

35.	Which of the following is a monomer of PVC?
Answer» Which of the following is a monomer of PVC?

Discussion

36.	the vapour pressure of two liquids A and B in their pure states are in ratio 1:2. A binary solution of A and B has A and B in mole proportion 1:2. The mole fraction of A in vapour phase of the solution will be ?? is the answer 0.33 or 0.2( because as the molefraction of A in vapour phase is used should we not use daltons law of partial pressure??)
Answer» the vapour pressure of two liquids A and B in their pure states are in ratio 1:2. A binary solution of A and B has A and B in mole proportion 1:2. The mole fraction of A in vapour phase of the solution will be ?? is the answer 0.33 or 0.2( because as the molefraction of A in vapour phase is used should we not use daltons law of partial pressure??)

36.

the vapour pressure of two liquids A and B in their pure states are in ratio 1:2. A binary solution of A and B has A and B in mole proportion 1:2. The mole fraction of A in vapour phase of the solution will be ?? is the answer 0.33 or 0.2( because as the molefraction of A in vapour phase is used should we not use daltons law of partial pressure??)

Answer»

the vapour pressure of two liquids A and B in their pure states are in ratio 1:2. A binary solution of A and B has A and B in mole proportion 1:2. The mole fraction of A in vapour phase of the solution will be ??

is the answer 0.33 or 0.2( because as the molefraction of A in vapour phase is used should we not use daltons law of partial pressure??)

Discussion

37.	[[Q]]Calculatea) G°andb) the equilibrium constant for the formation of NO2from NO and O2at 298 K wherefG°(NO2)= 52.0 kJ/molfG°(NO) = 87.0 kJ/molfG°(O2)= 0 kJ/mol
Answer» [[Q]] Calculate a) G°and b) the equilibrium constant for the formation of NO₂ from NO and O₂ at 298 K where _fG° (NO₂) = 52.0 kJ/mol _fG° (NO) = 87.0 kJ/mol _fG° (O₂) = 0 kJ/mol

37.

[[Q]]Calculatea) G°andb) the equilibrium constant for the formation of NO2from NO and O2at 298 K wherefG°(NO2)= 52.0 kJ/molfG°(NO) = 87.0 kJ/molfG°(O2)= 0 kJ/mol

Answer»

[[Q]]

Calculate
a)
G°and
b) the equilibrium constant for the formation of NO₂
from NO and O₂
at 298 K

where

_fG°
(NO₂)
= 52.0 kJ/mol

_fG°

(NO) = 87.0 kJ/mol

_fG°

(O₂)
= 0 kJ/mol

Discussion

38.	how to identify free radical addition and free radical substitution reactio
Answer» how to identify free radical addition and free radical substitution reactio

Discussion

39.	Calculate the mass of urea (NH,CONH) required in making 2.5 kg of 0.25 molal aqueous solution.
Answer» Calculate the mass of urea (NH,CONH) required in making 2.5 kg of 0.25 molal aqueous solution.

Discussion

40.	Calculate the amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at −6∘C.(Kf for water =1.85K kg mol−1)
Answer» Calculate the amount of ethylene glycol to be added to $4 k g$ of water to prevent it from freezing at $- 6^{\circ} C$ . $(K_{f} for water = 1.85 K k g m o l^{- 1})$

Discussion

41.	The Vanderwaal equation is given as(P+av2(v−b))=RTif the system executes some process from state 1 to state 2 the change in entropy is given as s2−s1=Cvlog(T2T1)+kThe value of k is
Answer» The Vanderwaal equation is given as $(P + \frac{a}{v^{2}} (v - b)) = R T$ if the system executes some process from state 1 to state 2 the change in entropy is given as $s_{2} - s_{1} = C_{v} log (\frac{T_{2}}{T_{1}}) + k$ The value of k is

Discussion

42.	What are the no of significant figures present in a pure number 1000
Answer» What are the no of significant figures present in a pure number 1000

Discussion

43.	3-methyl tolune is treated with br2 in presence of Febr3 what are the products formed? 1)2-bromo 3-methyl toluene and 2- bromo5-metyl toluene 2) 2- bromo 5- metyl toluene and2 -bromo3-methyl toluene 3)2- bromo5-metyl toluene and2- bromo5-methyl toluene 4)2-bromo 5-metyl toluene and3-bromo 5-metyl toluen
Answer» 3-methyl tolune is treated with br2 in presence of Febr3 what are the products formed? 1)2-bromo 3-methyl toluene and 2- bromo5-metyl toluene 2) 2- bromo 5- metyl toluene and2 -bromo3-methyl toluene 3)2- bromo5-metyl toluene and2- bromo5-methyl toluene 4)2-bromo 5-metyl toluene and3-bromo 5-metyl toluen

Discussion

44.	what is aqua regi
Answer» what is aqua regi

Discussion

45.	NaNO3 + H2SO4 → A–– + HNO3 A–– + NaCl → Na2SO4 + HCl A is.
Answer» $N a N O_{3} + H_{2} S O_{4} \to A - - + H N O_{3}$ $A - - + N a C l \to N a_{2} S O_{4} + H C l A$ is.

45.

NaNO3 + H2SO4 → A–– + HNO3 A–– + NaCl → Na2SO4 + HCl A is.

Answer»

$N a N O_{3} + H_{2} S O_{4} \to A - - + H N O_{3}$

$A - - + N a C l \to N a_{2} S O_{4} + H C l A$ is.

Discussion

46.	Which of the following has the least tendency to dimerise? (A) NO2 (B) ClO3 (C) ClO2 (D) Mn(CO)5 does delocalisation take place only during p pi d pi bonding?
Answer» Which of the following has the least tendency to dimerise? (A) NO2 (B) ClO3 (C) ClO2 (D) Mn(CO)5 does delocalisation take place only during p pi d pi bonding?

Discussion

47.	In an intrinsicsemiconductor the energy gap Egis1.2 eV. Its hole mobility is much smaller than electron mobility andindependent of temperature. What is the ratio between conductivity at600K and that at 300K? Assume that the temperature dependence ofintrinsic carrier concentration niisgiven bywhere n0 isa constant.
Answer» In an intrinsic semiconductor the energy gap E_gis 1.2 eV. Its hole mobility is much smaller than electron mobility and independent of temperature. What is the ratio between conductivity at 600K and that at 300K? Assume that the temperature dependence of intrinsic carrier concentration n_iis given by where n₀is a constant.

47.

In an intrinsicsemiconductor the energy gap Egis1.2 eV. Its hole mobility is much smaller than electron mobility andindependent of temperature. What is the ratio between conductivity at600K and that at 300K? Assume that the temperature dependence ofintrinsic carrier concentration niisgiven bywhere n0 isa constant.

Answer»

In an intrinsic
semiconductor the energy gap E_gis
1.2 eV. Its hole mobility is much smaller than electron mobility and
independent of temperature. What is the ratio between conductivity at
600K and that at 300K? Assume that the temperature dependence of
intrinsic carrier concentration n_iis
given by

where n₀is
a constant.

Discussion

48.	how many moles of KMnO4 are required to oxidise one mole of SnCl2 in acidic medium
Answer» how many moles of KMnO4 are required to oxidise one mole of SnCl2 in acidic medium

Discussion

49.	Tautomerism will be exhibited by
Answer» Tautomerism will be exhibited by

Discussion

50.	A closed tank has two compartments A and B, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed and is a perfect heat insulator (Figure 1). If the old partition is replaced by a new partition which can slide and conduct heat but does not allow the gas to leak across (Figure 2), the volume (in m3) of the compartment A after the system attains equilibrium is.
Answer» A closed tank has two compartments A and B, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed and is a perfect heat insulator (Figure 1). If the old partition is replaced by a new partition which can slide and conduct heat but does not allow the gas to leak across (Figure 2), the volume (in $m^{3})$ of the compartment A after the system attains equilibrium is.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Gastric juice contains 3.0g of HCl per litre. If a person produces 2.44 litre of gastric juice per day. How many antacid tablets each containing 400 mg of Al(OH)3 are needed to neutralize all the HCl produced in one day? Choose the nearest answer.

The table shown below gives the bond dissociation energies (Edis) for single covalent bonds of carbon (C) atoms with element ′A′, ′B′, ′C′ and ′D′. Which element has the smallest atoms? BondEdis(kJ mol−1)C−A240C−B328C−C276C−D485

which set has different class of compounds?

64. The order of screening effect of electrons of s p d and f orbital of a given shell of an atom on it outer shell electrons is a. s>p>d>f b. f>d>p>s c. pp&gt;s&gt;d

What is difference between mole and molecule?

Question 8:Assertion: The impure salt can be purified by the crystallization process.Reason: The process of crystallization is an example of physical change.

The electronic configuration of chromium in [Cr(NH3)6]3+ is:

In the electrolysis of a CuSO4 solution, how many grams of Cu are plated out on the cathode in the time that it takes to liberate 5.6 litre of O2, measured at STP, at the anode? (a)31.75 (b) 14.2 (c)4.32 (d)25.2

C2H2 + HOCl ----> what is the major product of the reaction

An aqueous solution of carbonic acid (H2CO3) contains

Element Fe has two oxidation states Fe2+ &amp; Fe3+, the correct order of radii of these ions will be:

why s has more negative electron gain enthalpythan o

A perfect gas at 27∘C is heated at constant pressure so as to triple its volume. The temperature of the gas will be

If 20 mL of a 0.1 M NaOH is added to 30 mL of 0.2M CH3COOH (pka=4.74), the pH of the resulting solutiin is

0.56 litre each of three samples of H2O2 labelled as 10 vol, 15 vol and 20 vol are mixed. The resultant normality of H2O2 solution is:

[Co(en)2(NH3)Cl]2+ is known to be a diamagnetic complex. What is the type of hybridisation it shows ?

Phenol is:

how to calculate coordinatation number in s.c , f.c.c and b.c.c

When KMnO4 acts as an oxidizing agent and ultimately formsMnO−24 ,MnO2 ,Mn2O3 andMn+2 , then the number of electrons transferred ( per Mn atom) in each case respectively is:

The mass of a certain nucleus X4 is less than that of its constituent particles by 0.03 u. The binding energy per nucleon of X4 nucleus will be

18 g of glucose (C6H12O6) is added to 178.2 g water at 760 torr. The vapour pressure of water (in torr) for this aqueous solution is:

Why is SI unit of work is Joule and SI unit of Moment of force(torque) different since both apparently have same formula except in moment of force it is perpendicular distance and in work it is only distance

Can the following groups of elements be classified as Dobereiner’s triads?(a) Na, Si, Cl (b) Be, Mg, CaGive the reason for your answer.(Atomic masses : Be = 9; Na = 23; Mg = 24 ; Si = 28 ; Cl = 35.5; Ca = 40)

Is it possible to have an element with atomic number 1.5 placed between hydrogen and helium?

What is the net reaction in Hall-Heroult process?

I need a help to know the SI unit of weight.

The total pressure of a mixture of 6.4 grams of oxygen and 5.6 grams of nitrogen present in a 2 lit vessel is 1200mm. What is the partial pressure of nitrogen in mm?

What volume of 5 molar Na2So4 must be added to 25 ml of 1 molar of bacl2 to produce 10 gram of b a s o4

95.What are enolizable hydrogen and alpha carbon?

When MnO2 is fused with KOH a coloured compound is formed. The product and its colour are

Which one of the following statement(s) is/are not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

Which of the following trend is/are correct?

What are D and L in Amino acids?

ntMaximum value (n+l+m) for unpaired electrons in second excited state of chlorine 17Cl isn nt28n nt25n nt20n ntNonen

Which of the following is a monomer of PVC?

[[Q]]Calculatea) G°andb) the equilibrium constant for the formation of NO2from NO and O2at 298 K wherefG°(NO2)= 52.0 kJ/molfG°(NO) = 87.0 kJ/molfG°(O2)= 0 kJ/mol

how to identify free radical addition and free radical substitution reactio

Calculate the mass of urea (NH,CONH) required in making 2.5 kg of 0.25 molal aqueous solution.

Calculate the amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at −6∘C.(Kf for water =1.85K kg mol−1)

The Vanderwaal equation is given as(P+av2(v−b))=RTif the system executes some process from state 1 to state 2 the change in entropy is given as s2−s1=Cvlog(T2T1)+kThe value of k is

What are the no of significant figures present in a pure number 1000

what is aqua regi

NaNO3 + H2SO4 → A–– + HNO3 A–– + NaCl → Na2SO4 + HCl A is.

Which of the following has the least tendency to dimerise? (A) NO2 (B) ClO3 (C) ClO2 (D) Mn(CO)5 does delocalisation take place only during p pi d pi bonding?

how many moles of KMnO4 are required to oxidise one mole of SnCl2 in acidic medium

Tautomerism will be exhibited by

64. The order of screening effect of electrons of s p d and f orbital of a given shell of an atom on it outer shell electrons is a. s>p>d>f b. f>d>p>s c. pp>s>d

Element Fe has two oxidation states Fe2+ & Fe3+, the correct order of radii of these ions will be: