46295 + Interview Questions in Chemistry

1.	CH2=CH−≡CH(A)HCl−−−→1 mol(B) The product (B) is:
Answer» $C H_{2} = C H - \equiv C H (A) H C l - -- \to 1 m o l (B)$ The product (B) is:

Discussion

2.	Why do gases always tend to be less soluble in liquids as the temperature is raised?
Answer» Why do gases always tend to be less soluble in liquids as the temperature is raised?

Discussion

3.	Select the isodiaphers among the following pairs.(1)27Al & 31P(2)12C & 14C(3)30Si & 31P(4)14N & 18O
Answer» Select the isodiaphers among the following pairs. (1)27Al & 31P (2)12C & 14C (3)30Si & 31P (4)14N & 18O

Discussion

4.	Which of the following free radical is most stable?
Answer» Which of the following free radical is most stable?

Discussion

5.	The combustion of hydrogen-oxygen mixture is used to produce very high temperatures (=2500∘ C) needed for certain types of welding operations.H2(g)+12O2(g)→H2O(g); ΔH=−230.9 kJQuantity of heat, (in kJ) evolved when a 200 g mixture containing equal parts of H2 and O2 mass is burned, is
Answer» The combustion of hydrogen-oxygen mixture is used to produce very high temperatures $(= 2500^{\circ} C)$ needed for certain types of welding operations. $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (g)$ ; $Δ H = - 230.9 kJ$ Quantity of heat, (in kJ) evolved when a $200 g$ mixture containing equal parts of $H_{2}$ and $O_{2}$ mass is burned, is

Discussion

6.	How to find oxidation number?
Answer» How to find oxidation number?

Discussion

7.	Chromium metal can be plated out from anacidic solution containing CrO3 according to the following reaction:CrO3+6H++6e−→Cr+3H2OCalculate the mass (m) of chromium plated out by 24000 coulomb.Also, find the time (t) it will take to plate out 1.5 g of chromium using 12.5 A current.Current efficiency is 40%Molecular weight of Cr is 52 g mol−1
Answer» Chromium metal can be plated out from an acidic solution containing $C r O_{3}$ according to the following reaction: $C r O_{3} + 6 H^{+} + 6 e^{-} \to C r + 3 H_{2} O$ Calculate the mass (m) of chromium plated out by $24000 c o u l o m b$ . Also, find the time (t) it will take to plate out $1.5 g$ of chromium using $12.5 A$ current. Current efficiency is $40 %$ Molecular weight of $C r$ is $52 g m o l^{- 1}$

Discussion

8.	1.What is the structure and IUPAC name of - CH3Cl(p-ClC6H4)2-CH(Br)CH3
Answer» 1.What is the structure and IUPAC name of - CH3Cl(p-ClC6H4)2-CH(Br)CH3

Discussion

9.	20mL of a mixture of CO and H2 were mixed with excess of O2 and exploded and cooled. There was a volume contraction of 18mL. All volume measurements corresponds to room temperature (27C) and one atmospheric pressure. Determine the volume ratio V1:V2 of CO and H2 in the original mixture.(a) 1:2 (b) 3:2(c) 2:3 (d) 4:1
Answer» 20mL of a mixture of CO and H2 were mixed with excess of O2 and exploded and cooled. There was a volume contraction of 18mL. All volume measurements corresponds to room temperature (27C) and one atmospheric pressure. Determine the volume ratio V1:V2 of CO and H2 in the original mixture. (a) 1:2 (b) 3:2 (c) 2:3 (d) 4:1

Discussion

10.	What is Na2CO3 made up of?
Answer» What is ${Na}_{2} {CO}_{3}$ made up of?

Discussion

11.	For the given reaction of monobromination of a compound, how many products are optically active (all isomers) :
Answer» For the given reaction of monobromination of a compound, how many products are optically active (all isomers) :

Discussion

12.	With respect to alkali metals, it is said that the first member of each group shows anomalous behaviour, and there are several reasons for this.One of the reasons, for this has been given that vacant d-orbitals are absent. Why are these vacant d orbitals required ?
Answer» With respect to alkali metals, it is said that the first member of each group shows anomalous behaviour, and there are several reasons for this. One of the reasons, for this has been given that vacant d-orbitals are absent. Why are these vacant d orbitals required ?

Discussion

13.	25. If a is the length of the side of a cube the distance between the body centered atom and one corner atom in the Cube will be
Answer» 25. If a is the length of the side of a cube the distance between the body centered atom and one corner atom in the Cube will be

Discussion

14.	If the concentration of the electrolyte increases then the conductivity increases because charge carrying particles increases but at the same time the molar conductance decreases why is it so?
Answer» If the concentration of the electrolyte increases then the conductivity increases because charge carrying particles increases but at the same time the molar conductance decreases why is it so?

Discussion

15.	The volume of oxygen at STP required to burn 2.4 g of carbon completely is
Answer» The volume of oxygen at STP required to burn 2.4 g of carbon completely is

Discussion

16.	find max no of orbitals,subshells,and electron when1)n+l=32)n+l=4
Answer» find max no of orbitals,subshells,and electron when 1)n+l=3 2)n+l=4

Discussion

17.	In the reaction, CH3COOHNaOHHeatXNaOH,CaO−−−−−−−→Y;Y is
Answer» In the reaction, $C H_{3} C O O H \frac{N a O H}{H e a t} X N a O H, C a O - ------ \to Y; Y$ is

Discussion

18.	Atoms of the which of the following groups possess the lowest ionization energy
Answer» Atoms of the which of the following groups possess the lowest ionization energy

Discussion

19.	The complex ion havin minimum magnitude of Δ0 (CFSE)is
Answer» The complex ion havin minimum magnitude of $Δ_{0}$ (CFSE)is

Discussion

20.	In the graph of average rate for reactant why concenteration of c2is taken greater then that of c1 it should be.like c1 should be greater then c2 because as reaction proceeds concentration of reactant decrease
Answer» In the graph of average rate for reactant why concenteration of c2is taken greater then that of c1 it should be.like c1 should be greater then c2 because as reaction proceeds concentration of reactant decrease

Discussion

21.	22. Ch3-ch=ch-c6h4- oh + hbr > ____________
Answer» 22. Ch3-ch=ch-c6h4- oh + hbr > ____________

Discussion

22.	3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?
Answer» 3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?

Discussion

23.	one mole of N2 gas at 0.8 atm takes 38s to diffuse through pin whole where as one mol of unknown compound of xenon with flourine at 16atm takes 56.26s to diffuse through same whole ,then molecular mass of compound is (atm mass of xe=131.30
Answer» one mole of N2 gas at 0.8 atm takes 38s to diffuse through pin whole where as one mol of unknown compound of xenon with flourine at 16atm takes 56.26s to diffuse through same whole ,then molecular mass of compound is (atm mass of xe=131.30

Discussion

24.	For an equilibrium reaction A (g) + B (g) ⇌ C (g) + D (g), ΔH = -ve. An increase in temperature would cause
Answer» For an equilibrium reaction A (g) + B (g) $⇌$ C (g) + D (g), $Δ H$ = -ve. An increase in temperature would cause

Discussion

25.	36. Is the statement that the Extent of hydration is PCl5 > SiCl4 and BCl3 < CCl4 is true or not?
Answer» 36. Is the statement that the Extent of hydration is PCl5 > SiCl4 and BCl3 < CCl4 is true or not?

Discussion

26.	the ph of 0.2M aqueous solution of NH4cl will be (pkb of NH3=4.74,LOg 2=0.3
Answer» the ph of 0.2M aqueous solution of NH4cl will be (pkb of NH3=4.74,LOg 2=0.3

Discussion

27.	The product formed in the reaction is:
Answer» The product formed in the reaction is:

Discussion

28.	The correct order regarding second ionization potential is1-N>C>B>Be2-N>C>Be>B3-N>B>C>Be4-Be>N>C>B
Answer» The correct order regarding second ionization potential is 1-N>C>B>Be 2-N>C>Be>B 3-N>B>C>Be 4-Be>N>C>B

Discussion

29.	The shape and geometry of XeF4 are respectively:
Answer» The shape and geometry of $X e F_{4}$ are respectively:

Discussion

30.	The dissociation constant of a substituted benzoic acid at 25∘C is 1.0×10−4. The pH of a 0.01 M solution of its sodium salt is ___
Answer» The dissociation constant of a substituted benzoic acid at $25^{\circ} C$ is $1.0 \times 10^{- 4}$ . The pH of a 0.01 M solution of its sodium salt is ___

Discussion

31.	On what values does state function depend on?
Answer» On what values does state function depend on?

Discussion

32.	The correct order of increasing basicity is CH3CH2INH2 CH3NH\|\|CII CH3O\|\|CIIINH2
Answer» The correct order of increasing basicity is $C H_{3} C H_{2} I N H_{2} C H_{3} N H \| \| C I I C H_{3} O \| \| C I I I N H_{2}$

32.

The correct order of increasing basicity is CH3CH2INH2 CH3NH||CII CH3O||CIIINH2

Answer»

The correct order of increasing basicity is

$C H_{3} C H_{2} I N H_{2} C H_{3} N H | | C I I C H_{3} O | | C I I I N H_{2}$

Discussion

33.	Why hydrogen gas is not released when nitric acid is reacted with zinc
Answer» Why hydrogen gas is not released when nitric acid is reacted with zinc

Discussion

34.	15. A solution of complex salt, CrCl3.6H2O having coordination no. 6 shows an osmotic pressure 73.89 atm at 300 K when 1 M solution of complex is used. One litre of this solution on treatment with excess of AgNO3 solution ( Degree of dissociation = 1) leads to the formation of AgCl : (a) 1 (b) 2 (c) 3 (d) 1.5
Answer» 15. A solution of complex salt, CrCl3.6H2O having coordination no. 6 shows an osmotic pressure 73.89 atm at 300 K when 1 M solution of complex is used. One litre of this solution on treatment with excess of AgNO3 solution ( Degree of dissociation = 1) leads to the formation of AgCl : (a) 1 (b) 2 (c) 3 (d) 1.5

Discussion

35.	Which of the following reagents are not correctly matched with the reaction?
Answer» Which of the following reagents are not correctly matched with the reaction?

Discussion

36.	19. A Sweet smelling organiccompound (X) having the molecularformula C Hi O2, on treatmentwithsodium hydroxide (NaOH) give asodium salt of a carboxylic acidwhich upon acidification gives 2-methyl propanoic acid and ainalcohol (Y). In take of alcohol (Y) invery small quantities can causeblindness and finally deathAlcohol (Y) upon completeoxidation give a carboxylic acid (Z),which is found in red ants(a) Write the structural formula andchemical name of the organiccompound (X)(b) What is the name of the alcohol(c) Name the carboxylic acid (Z)which is found in red ants.
Answer» 19. A Sweet smelling organiccompound (X) having the molecularformula C Hi O2, on treatmentwithsodium hydroxide (NaOH) give asodium salt of a carboxylic acidwhich upon acidification gives 2-methyl propanoic acid and ainalcohol (Y). In take of alcohol (Y) invery small quantities can causeblindness and finally deathAlcohol (Y) upon completeoxidation give a carboxylic acid (Z),which is found in red ants(a) Write the structural formula andchemical name of the organiccompound (X)(b) What is the name of the alcohol(c) Name the carboxylic acid (Z)which is found in red ants.

Discussion

37.	No of protons in 5 gm of water
Answer» No of protons in 5 gm of water

Discussion

38.	The equivalent weight of a divalent metal is W. The molecular weight of its chloride is:
Answer» The equivalent weight of a divalent metal is $W$ . The molecular weight of its chloride is:

Discussion

39.	Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?
Answer» Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?

Discussion

40.	0.35 g of an organic compound was Kjeldahlised and ammonia evolved was absorbed in 100 mL of N5H2SO4 the residual acid required 154 mL of N10NaOH for neutralisation. Calculate the percentage of nitrogen in the compound.
Answer» $0.35 g$ of an organic compound was Kjeldahlised and ammonia evolved was absorbed in $100 mL$ of $\frac{N}{5} H_{2} S O_{4}$ the residual acid required $154 mL$ of $\frac{N}{10} N a O H$ for neutralisation. Calculate the percentage of nitrogen in the compound.

Discussion

41.	LiAlH4 is obtained by reacting an excess of ___ with an ethereal solution of AlCl3:
Answer» $L i A l H_{4}$ is obtained by reacting an excess of ___ with an ethereal solution of $A l C l_{3}$ :

Discussion

42.	Which of the following molecules have zero dipole moment?
Answer» Which of the following molecules have zero dipole moment?

Discussion

43.	Δ rH^° of which of the following reactions is zero at s†an dard conditions? Options: (1) H_2(g) → 2H^+(g) + 2e^- (2) H_2(g) + aq → 2H^+(aq) + 2e^- (3) 2H(g) → 2H^+(g) + 2e^- (4) 2H(g) + aq → 2H^+(aq) + 2e^-.
Answer» Δ rH^° of which of the following reactions is zero at s†an dard conditions? Options: (1) H_2(g) → 2H^+(g) + 2e^- (2) H_2(g) + aq → 2H^+(aq) + 2e^- (3) 2H(g) → 2H^+(g) + 2e^- (4) 2H(g) + aq → 2H^+(aq) + 2e^-.

Discussion

44.	31.Write IUPAC name of K3[Fe(CN)5(No)] and explain
Answer» 31.Write IUPAC name of K3[Fe(CN)5(No)] and explain

Discussion

45.	The percentage of p-character in forming P-P bonds in P4 molecule is:
Answer» The percentage of p-character in forming P-P bonds in P₄ molecule is:

Discussion

46.	The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be
Answer» The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole^-1, then molar mass of the solute will be

Discussion

47.	What is formed on the reaction of phenol with conc HNO3 and conc H2SO4?
Answer» What is formed on the reaction of phenol with conc HNO3 and conc H2SO4?

Discussion

48.	Explain the calculation of radius of tetrahedral void
Answer» Explain the calculation of radius of tetrahedral void

Discussion

49.	What is meant by concentration of reaction and rate of reactions?
Answer» What is meant by concentration of reaction and rate of reactions?

Discussion

50.	2 moles of a gas at temperature T and volume V are heated to twice its volume at cons†an t pressure.If gamma is the adiabatic cons†an t ,then increase in internal energy of the gas is?
Answer» 2 moles of a gas at temperature T and volume V are heated to twice its volume at cons†an t pressure.If gamma is the adiabatic cons†an t ,then increase in internal energy of the gas is?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

CH2=CH−≡CH(A)HCl−−−→1 mol(B) The product (B) is:

Why do gases always tend to be less soluble in liquids as the temperature is raised?

Select the isodiaphers among the following pairs.(1)27Al & 31P(2)12C & 14C(3)30Si & 31P(4)14N & 18O

Which of the following free radical is most stable?

The combustion of hydrogen-oxygen mixture is used to produce very high temperatures (=2500∘ C) needed for certain types of welding operations.H2(g)+12O2(g)→H2O(g); ΔH=−230.9 kJQuantity of heat, (in kJ) evolved when a 200 g mixture containing equal parts of H2 and O2 mass is burned, is

How to find oxidation number?

1.What is the structure and IUPAC name of - CH3Cl(p-ClC6H4)2-CH(Br)CH3

What is Na2CO3 made up of?

For the given reaction of monobromination of a compound, how many products are optically active (all isomers) :

With respect to alkali metals, it is said that the first member of each group shows anomalous behaviour, and there are several reasons for this.One of the reasons, for this has been given that vacant d-orbitals are absent. Why are these vacant d orbitals required ?

25. If a is the length of the side of a cube the distance between the body centered atom and one corner atom in the Cube will be

If the concentration of the electrolyte increases then the conductivity increases because charge carrying particles increases but at the same time the molar conductance decreases why is it so?

The volume of oxygen at STP required to burn 2.4 g of carbon completely is

find max no of orbitals,subshells,and electron when1)n+l=32)n+l=4

In the reaction, CH3COOHNaOHHeatXNaOH,CaO−−−−−−−→Y;Y is

Atoms of the which of the following groups possess the lowest ionization energy

The complex ion havin minimum magnitude of Δ0 (CFSE)is

In the graph of average rate for reactant why concenteration of c2is taken greater then that of c1 it should be.like c1 should be greater then c2 because as reaction proceeds concentration of reactant decrease

22. Ch3-ch=ch-c6h4- oh + hbr > ____________

3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?

one mole of N2 gas at 0.8 atm takes 38s to diffuse through pin whole where as one mol of unknown compound of xenon with flourine at 16atm takes 56.26s to diffuse through same whole ,then molecular mass of compound is (atm mass of xe=131.30

For an equilibrium reaction A (g) + B (g) ⇌ C (g) + D (g), ΔH = -ve. An increase in temperature would cause

36. Is the statement that the Extent of hydration is PCl5 > SiCl4 and BCl3 < CCl4 is true or not?

the ph of 0.2M aqueous solution of NH4cl will be (pkb of NH3=4.74,LOg 2=0.3

The product formed in the reaction is:

The correct order regarding second ionization potential is1-N>C>B>Be2-N>C>Be>B3-N>B>C>Be4-Be>N>C>B

The shape and geometry of XeF4 are respectively:

The dissociation constant of a substituted benzoic acid at 25∘C is 1.0×10−4. The pH of a 0.01 M solution of its sodium salt is ___

On what values does state function depend on?

The correct order of increasing basicity is CH3CH2INH2 CH3NH||CII CH3O||CIIINH2

Why hydrogen gas is not released when nitric acid is reacted with zinc

Which of the following reagents are not correctly matched with the reaction?

No of protons in 5 gm of water

The equivalent weight of a divalent metal is W. The molecular weight of its chloride is:

Which monosaccharide units are present in starch, cellulose and glucose and which linkages link these units?

0.35 g of an organic compound was Kjeldahlised and ammonia evolved was absorbed in 100 mL of N5H2SO4 the residual acid required 154 mL of N10NaOH for neutralisation. Calculate the percentage of nitrogen in the compound.

LiAlH4 is obtained by reacting an excess of ___ with an ethereal solution of AlCl3:

Which of the following molecules have zero dipole moment?

Δ rH^° of which of the following reactions is zero at s†an dard conditions? Options: (1) H_2(g) → 2H^+(g) + 2e^- (2) H_2(g) + aq → 2H^+(aq) + 2e^- (3) 2H(g) → 2H^+(g) + 2e^- (4) 2H(g) + aq → 2H^+(aq) + 2e^-.

31.Write IUPAC name of K3[Fe(CN)5(No)] and explain

The percentage of p-character in forming P-P bonds in P4 molecule is:

The freezing point of a solution prepared from 1.25 gm of a non-electrolyte and 20gm of water is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be

What is formed on the reaction of phenol with conc HNO3 and conc H2SO4?

Explain the calculation of radius of tetrahedral void

What is meant by concentration of reaction and rate of reactions?

2 moles of a gas at temperature T and volume V are heated to twice its volume at cons†an t pressure.If gamma is the adiabatic cons†an t ,then increase in internal energy of the gas is?