46295 + Interview Questions in Chemistry

1.	is melting of ice endothermic or exothermic. why
Answer» is melting of ice endothermic or exothermic. why

Discussion

2.	When 262 g of xenon (atomic mass = 131) reacted completely with 152 g of fluorine (atomic mass = 19), a mixture of XeF2 and XeF6 was produced. The molar ratio XeF2 : XeF6 is :
Answer» When 262 g of xenon (atomic mass = 131) reacted completely with 152 g of fluorine (atomic mass = 19), a mixture of XeF $_{2}$ and XeF $_{6}$ was produced. The molar ratio XeF $_{2}$ : XeF $_{6}$ is :

Discussion

3.	The decreasing order of solubility of methanal (A), propanaldehyde (B), benzaldehyde (C) and acetophenone (D):
Answer» The decreasing order of solubility of methanal (A), propanaldehyde (B), benzaldehyde (C) and acetophenone (D):

Discussion

4.	Match the following Column−I––––––––––––––Column−II–––––––––––––––(I) (NH4)2SO4(P) h=√KHC(II) KCl(Q) PH=12[PKW+PKa+log c](III) CH3COOK(R) KH=KwKa×Kb(IV) (NH4)2S[H+]=[O¯H]
Answer» Match the following $\begin{matrix} C o l u m n - I - ------------ - & C o l u m n - I I - ------------- - (I) (N H_{4})_{2} S O_{4} & (P) h = \sqrt{\frac{K_{H}}{C}} (I I) K C l & (Q) P^{H} = \frac{1}{2} [P^{K W} + P^{K a} + l o g c] (I I I) C H_{3} C O O K & (R) K_{H} = \frac{K_{w}}{K_{a} \times K_{b}} (I V) (N H_{4})_{2} S & [H^{+}] = [O ¯ H] \end{matrix}$

Discussion

5.	If the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.
Answer» If the starting material for the manufacture of silicones is RSiCl₃, write the structure of the product formed.

Discussion

6.	For the cell reaction:Zn(s)+Cu2+(aq)→Cu(s)+Zn2+(aq)E∘cell=1.10 V,△G∘ is:
Answer» For the cell reaction: $Z n (s) + C u^{2 +} (a q) \to C u (s) + Z n^{2 +} (a q)$ $E_{c e l l}^{\circ} = 1.10 V, △ G^{\circ}$ is:

Discussion

7.	what is methoxy ethene?
Answer» what is methoxy ethene?

Discussion

8.	Et−O−O\|\|C−CH2−CH2−O\|\|C−O−Etexcess−OEt→?
Answer» $E t - O - O \| \| C - C H_{2} - C H_{2} - O \| \| C - O - E t e x c e s s - O E t \to ?$

Discussion

9.	Calculate the pH of a solution prepared by mixing 2.0 mL of a strong acid (HCI) solution of pH 3.0 and 3.0 mL of a strong base (NaOH) of pH 10.0 (Take log17= 1.23)
Answer» Calculate the pH of a solution prepared by mixing $2.0 mL$ of a strong acid $(H C I)$ solution of pH $3.0$ and $3.0 mL$ of a strong base $(N a O H)$ of pH $10.0$ (Take log17= 1.23)

Discussion

10.	The element(s) belonging to group 15 is/are:
Answer» The element(s) belonging to group 15 is/are:

Discussion

11.	Pair the addition equations with their correct multiplication equations.
Answer» Pair the addition equations with their correct multiplication equations.

Discussion

12.	When a solution of phosphine in water is decomposed in the presence of light, __ phosphorus is obtained
Answer» When a solution of phosphine in water is decomposed in the presence of light, __ phosphorus is obtained

Discussion

13.	What is primary and secondary valancy
Answer» What is primary and secondary valancy

Discussion

14.	Inorganic polymer among the following is
Answer» Inorganic polymer among the following is

Discussion

15.	Outline the principlesof refining of metals by the following methods:(i) Zonerefining(ii) Electrolyticrefining(iii) Vapourphase refining
Answer» Outline the principles of refining of metals by the following methods: (i) Zone refining (ii) Electrolytic refining (iii) Vapour phase refining

15.

Outline the principlesof refining of metals by the following methods:(i) Zonerefining(ii) Electrolyticrefining(iii) Vapourphase refining

Answer»

Outline the principles
of refining of metals by the following methods:

(i) Zone
refining

(ii) Electrolytic
refining

(iii) Vapour
phase refining

Discussion

16.	Why is [Ni(CN)4]2- dsp2 and [Ni(CO)4] sp3 even though CO is stronger ligand than CN-?
Answer» Why is [Ni(CN)4]2- dsp2 and [Ni(CO)4] sp3 even though CO is stronger ligand than CN-?

Discussion

17.	How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]
Answer» How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]

Discussion

18.	What is the correct order of nucleophilicity in the following options?
Answer» What is the correct order of nucleophilicity in the following options?

Discussion

19.	What is ment by the term Diploid and Haploid cells
Answer» What is ment by the term Diploid and Haploid cells

Discussion

20.	A saturated solution xcl3 has a vapour pressure 17.20mm hg at 20 C while pure water vapour pressure is 17.25 mm hg solubility product of xcl3 at 20 C is
Answer» A saturated solution xcl3 has a vapour pressure 17.20mm hg at 20 C while pure water vapour pressure is 17.25 mm hg solubility product of xcl3 at 20 C is

Discussion

21.	22.Balance the equation by oxidation number method MnO4- + SO2 ---> Mn2+ + HSO4-
Answer» 22.Balance the equation by oxidation number method MnO4- + SO2 ---> Mn2+ + HSO4-

Discussion

22.	If potential energy of a proton and an electron system is given by U=-Ke^2/2R^3 where e is the charge of the electron and R is the radius of orbit. Then calculate variation of R and total energy with n
Answer» If potential energy of a proton and an electron system is given by U=-Ke^2/2R^3 where e is the charge of the electron and R is the radius of orbit. Then calculate variation of R and total energy with n

Discussion

23.	what is the concentration of chloride ions in the mixture of 500ml , 1M NaCl solution and 500 ml , 1M CaCl2 solution
Answer» what is the concentration of chloride ions in the mixture of 500ml , 1M NaCl solution and 500 ml , 1M CaCl2 solution

Discussion

24.	Which of the following pairs of compound can be used as starting material in the synthesis of 2-phenyl-2-pentanol?
Answer» Which of the following pairs of compound can be used as starting material in the synthesis of $2-phenyl-2-pentanol$ ?

Discussion

25.	calculate the weight of oxygen produced by thermal decomposition of 10g of potassium chlorate
Answer» calculate the weight of oxygen produced by thermal decomposition of 10g of potassium chlorate

Discussion

26.	Copper oxide is heated with hydrogen to form copper metal and water. What happens to copper oxide?
Answer» Copper oxide is heated with hydrogen to form copper metal and water. What happens to copper oxide?

Discussion

27.	Why is a planar node called as angular node? Does it have any relationship with any angle?
Answer» Why is a planar node called as angular node? Does it have any relationship with any angle?

Discussion

28.	Differentiate: x/(x+1)
Answer» Differentiate: x/(x+1)

Discussion

29.	For the process H2O (l)⇌H2O (g) (1 bar, 373K), the correct set of thermodynamic parameters is
Answer» For the process $H_{2} O (l) ⇌ H_{2} O (g) (1 b a r, 373 K),$ the correct set of thermodynamic parameters is

Discussion

30.	Given, C(graphites)+O2(g)→CO2(g)Δr H∘=−393.5 kJ mol−1H2(g)+12 O2(g)→H2O(l);ΔrH∘=−285.8 kJ mol−2CO2(g+2H2O(l)→CH4(g)+2O2(g)ΔrH∘=+890.3 kJ mol−1Based on the above thermochemical equations, the value of Δr H∘ at 298K for the reaction, C(graphite)+2H2(g)→CH4(g) will be
Answer» Given, $C_{(g r a p h i t e s)} + O_{2} (g) \to C O_{2} (g)$ $Δ_{r} H^{\circ} = - 393.5 k J m o l^{- 1}$ $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l);$ $Δ_{r} H^{\circ} = - 285.8 k J m o l^{- 2}$ $C O_{2} (g + 2 H_{2} O (l) \to C H_{4} (g) + 2 O_{2} (g)$ $Δ_{r} H^{\circ} = + 890.3 k J m o l^{- 1}$ Based on the above thermochemical equations, the value of $Δ_{r} H^{\circ}$ at 298K for the reaction, $C_{(g r a p h i t e)} + 2 H_{2} (g) \to C H_{4} (g)$ will be

Discussion

31.	A weak base BOH is titrated with a strong acid HA. When 10ml of HA is added, the pH is found to be 9.00 and when 25 ml is added, pH is 8.00. The volume of the acid required to reach the equivalence point
Answer» A weak base BOH is titrated with a strong acid HA. When 10ml of HA is added, the pH is found to be 9.00 and when 25 ml is added, pH is 8.00. The volume of the acid required to reach the equivalence point

Discussion

32.	“The resultant heat change in a reaction is the same whether it takes place in one or several stages.” This statement is called
Answer» “The resultant heat change in a reaction is the same whether it takes place in one or several stages.” This statement is called

Discussion

33.	8.Which of the following colloids contain gas as dispersed phase and solid as dispersion medium? A) face cream B) cheese C) pumice D) cod liver oil
Answer» 8.Which of the following colloids contain gas as dispersed phase and solid as dispersion medium? A) face cream B) cheese C) pumice D) cod liver oil

Discussion

34.	variation of stability of 15 group element
Answer» variation of stability of 15 group element

Discussion

35.	Lewis acid character b2h6,bf3,bbr3,bi3
Answer» Lewis acid character b2h6,bf3,bbr3,bi3

Discussion

36.	A piece of gold weighs 10g in air and 9g in water.What is he volume of the cavity?\lbrack Density of gold=19.3 g/cc\rbrack
Answer» A piece of gold weighs 10g in air and 9g in water.What is he volume of the cavity?\lbrack Density of gold=19.3 g/cc\rbrack

Discussion

37.	Which of the following compounds can be expected to decarboxylate when heated?
Answer» Which of the following compounds can be expected to decarboxylate when heated?

Discussion

38.	The first ionistation enthalpies of Na, Mg, Al, and Si are in the order (a) Na< Mg > Al < Si (b) Na> Mg > Al > Si (c) Na< Mg< Al< Si (d) Na> Mg> Al < Si
Answer» The first ionistation enthalpies of Na, Mg, Al, and Si are in the order (a) Na< Mg > Al < Si (b) Na> Mg > Al > Si (c) Na< Mg< Al< Si (d) Na> Mg> Al < Si

Discussion

39.	What is value of equivalent air thickness and it's derivation.
Answer» What is value of equivalent air thickness and it's derivation.

Discussion

40.	If 1 Faraday were to be 60230 coulombs instead of 96500 coulombs, what will be the charge of an electron? (1 Faraday= total charge on the collection of 1 mole of electrons)
Answer» If 1 Faraday were to be 60230 coulombs instead of 96500 coulombs, what will be the charge of an electron? (1 Faraday= total charge on the collection of 1 mole of electrons)

Discussion

41.

Match List-I with List-II. List-I List-II(a) Isothermal (i) Pressure constant(b) Isochoric(ii) Temperature constant(c) Adiabatic(iii) Volume constant(d) Isobaric(iv) Heat content is constant Choose the correct answer from the options given below -

Answer»

Match List-I with List-II.

List-I	List-II
$(a)$ Isothermal	$(i)$ Pressure constant
$(b)$ Isochoric	$(i i)$ Temperature constant
$(c)$ Adiabatic	$(i i i)$ Volume constant
$(d)$ Isobaric	$(i v)$ Heat content is constant

Choose the correct answer from the options given below -

Discussion

42.	Question 48 Match the items given in Column I with the type of solutions given in Column II. Column I Column IIA. Soda water1. A solution of gas in solidB. Sugar solution2. A solution of gas in gasC. German silver3. A solution of solid in liquidD. Air4. A solution of solid in solidE. Hydrogen gas in palladlum5. A solution of gas in liquid6. A solution of liquid in solid
Answer» Question 48 Match the items given in Column I with the type of solutions given in Column II. $\begin{matrix} C o l u m n I & C o l u m n I I A . S o d a w a t e r & 1. A s o l u t i o n o f g a s i n s o l i d B . S u g a r s o l u t i o n & 2. A s o l u t i o n o f g a s i n g a s C . G e r m a n s i l v e r & 3. A s o l u t i o n o f s o l i d i n l i q u i d D . A i r & 4. A s o l u t i o n o f s o l i d i n s o l i d E . H y d r o g e n g a s i n p a l l a d l u m & 5. A s o l u t i o n o f g a s i n l i q u i d 6. A s o l u t i o n o f l i q u i d i n s o l i d \end{matrix}$

Discussion

43.	What is the equivalent mass of Barium Hydroxide?
Answer» What is the equivalent mass of Barium Hydroxide?

Discussion

44.	Riemer Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below The electrophile in this reaction is
Answer» Riemer Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below The electrophile in this reaction is

44.

Riemer Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below The electrophile in this reaction is

Answer»

Riemer Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below

The electrophile in this reaction is

Discussion

45.	The dihedral angle between the hydrogen atoms of two methyl groups in staggered conformation of ethane is :
Answer» The dihedral angle between the hydrogen atoms of two methyl groups in staggered conformation of ethane is :

Discussion

46.	Which one of the following has △So greater than zero ?
Answer» Which one of the following has $△ S^{o}$ greater than zero ?

Discussion

47.	why alkanes are insoluble in water and radiallysoluble in organic solvents?
Answer» why alkanes are insoluble in water and radiallysoluble in organic solvents?

Discussion

48.	If the ionic product of water at 40oC is 4×10−14. The concentration of OH− ions in water at 40∘C is:
Answer» If the ionic product of water at $40^{o} C$ is $4 \times 10^{- 14}$ . The concentration of $O H^{-}$ ions in water at $40^{\circ} C$ is:

Discussion

49.	How many maximum number of electrons in a potassium atom satisfy l+m=0
Answer» How many maximum number of electrons in a potassium atom satisfy l+m=0

Discussion

50.	How frequency remains constant though the medium changes?
Answer» How frequency remains constant though the medium changes?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

is melting of ice endothermic or exothermic. why

When 262 g of xenon (atomic mass = 131) reacted completely with 152 g of fluorine (atomic mass = 19), a mixture of XeF2 and XeF6 was produced. The molar ratio XeF2 : XeF6 is :

The decreasing order of solubility of methanal (A), propanaldehyde (B), benzaldehyde (C) and acetophenone (D):

Match the following Column−I––––––––––––––Column−II–––––––––––––––(I) (NH4)2SO4(P) h=√KHC(II) KCl(Q) PH=12[PKW+PKa+log c](III) CH3COOK(R) KH=KwKa×Kb(IV) (NH4)2S[H+]=[O¯H]

If the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.

For the cell reaction:Zn(s)+Cu2+(aq)→Cu(s)+Zn2+(aq)E∘cell=1.10 V,△G∘ is:

what is methoxy ethene?

Et−O−O||C−CH2−CH2−O||C−O−Etexcess−OEt→?

Calculate the pH of a solution prepared by mixing 2.0 mL of a strong acid (HCI) solution of pH 3.0 and 3.0 mL of a strong base (NaOH) of pH 10.0 (Take log17= 1.23)

The element(s) belonging to group 15 is/are:

Pair the addition equations with their correct multiplication equations.

When a solution of phosphine in water is decomposed in the presence of light, __ phosphorus is obtained

What is primary and secondary valancy

Inorganic polymer among the following is

Outline the principlesof refining of metals by the following methods:(i) Zonerefining(ii) Electrolyticrefining(iii) Vapourphase refining

Why is [Ni(CN)4]2- dsp2 and [Ni(CO)4] sp3 even though CO is stronger ligand than CN-?

How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]

What is the correct order of nucleophilicity in the following options?

What is ment by the term Diploid and Haploid cells

A saturated solution xcl3 has a vapour pressure 17.20mm hg at 20 C while pure water vapour pressure is 17.25 mm hg solubility product of xcl3 at 20 C is

22.Balance the equation by oxidation number method MnO4- + SO2 ---> Mn2+ + HSO4-

If potential energy of a proton and an electron system is given by U=-Ke^2/2R^3 where e is the charge of the electron and R is the radius of orbit. Then calculate variation of R and total energy with n

what is the concentration of chloride ions in the mixture of 500ml , 1M NaCl solution and 500 ml , 1M CaCl2 solution

Which of the following pairs of compound can be used as starting material in the synthesis of 2-phenyl-2-pentanol?

calculate the weight of oxygen produced by thermal decomposition of 10g of potassium chlorate

Copper oxide is heated with hydrogen to form copper metal and water. What happens to copper oxide?

Why is a planar node called as angular node? Does it have any relationship with any angle?

Differentiate: x/(x+1)

For the process H2O (l)⇌H2O (g) (1 bar, 373K), the correct set of thermodynamic parameters is

Given, C(graphites)+O2(g)→CO2(g)Δr H∘=−393.5 kJ mol−1H2(g)+12 O2(g)→H2O(l);ΔrH∘=−285.8 kJ mol−2CO2(g+2H2O(l)→CH4(g)+2O2(g)ΔrH∘=+890.3 kJ mol−1Based on the above thermochemical equations, the value of Δr H∘ at 298K for the reaction, C(graphite)+2H2(g)→CH4(g) will be

A weak base BOH is titrated with a strong acid HA. When 10ml of HA is added, the pH is found to be 9.00 and when 25 ml is added, pH is 8.00. The volume of the acid required to reach the equivalence point

“The resultant heat change in a reaction is the same whether it takes place in one or several stages.” This statement is called

8.Which of the following colloids contain gas as dispersed phase and solid as dispersion medium? A) face cream B) cheese C) pumice D) cod liver oil

variation of stability of 15 group element

Lewis acid character b2h6,bf3,bbr3,bi3

A piece of gold weighs 10g in air and 9g in water.What is he volume of the cavity?\lbrack Density of gold=19.3 g/cc\rbrack

Which of the following compounds can be expected to decarboxylate when heated?

The first ionistation enthalpies of Na, Mg, Al, and Si are in the order (a) Na&lt; Mg &gt; Al &lt; Si (b) Na&gt; Mg &gt; Al &gt; Si (c) Na&lt; Mg&lt; Al&lt; Si (d) Na&gt; Mg&gt; Al &lt; Si

What is value of equivalent air thickness and it's derivation.

If 1 Faraday were to be 60230 coulombs instead of 96500 coulombs, what will be the charge of an electron? (1 Faraday= total charge on the collection of 1 mole of electrons)

Match List-I with List-II. List-I List-II(a) Isothermal (i) Pressure constant(b) Isochoric(ii) Temperature constant(c) Adiabatic(iii) Volume constant(d) Isobaric(iv) Heat content is constant Choose the correct answer from the options given below -

What is the equivalent mass of Barium Hydroxide?

The dihedral angle between the hydrogen atoms of two methyl groups in staggered conformation of ethane is :

Which one of the following has △So greater than zero ?

why alkanes are insoluble in water and radiallysoluble in organic solvents?

If the ionic product of water at 40oC is 4×10−14. The concentration of OH− ions in water at 40∘C is:

How many maximum number of electrons in a potassium atom satisfy l+m=0

How frequency remains constant though the medium changes?

The first ionistation enthalpies of Na, Mg, Al, and Si are in the order (a) Na< Mg > Al < Si (b) Na> Mg > Al > Si (c) Na< Mg< Al< Si (d) Na> Mg> Al < Si