46295 + Interview Questions in Chemistry

1.	The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be 14.35 g. The % purity of NaCl solution would be :
Answer» The impure $6 g$ of $N a C l$ is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be $14.35 g$ . The $%$ purity of $N a C l$ solution would be :

Discussion

2.	When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in:
Answer» When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in:

Discussion

3.	When glycol is heated with dicarboxylic acid, the products are
Answer» When glycol is heated with dicarboxylic acid, the products are

Discussion

4.	n moles of an ideal gas undergoes a process A→B as shown in the figure. The maximum temperature of the gas during the process will be:
Answer» $n$ moles of an ideal gas undergoes a process $A \to B$ as shown in the figure. The maximum temperature of the gas during the process will be:

Discussion

5.	Which of the following compounds shows different geometry: 1. TlF3 2. TlCl3 3. TlI3
Answer» Which of the following compounds shows different geometry: 1. $T l F_{3}$ 2. $T l C l_{3}$ 3. $T l I_{3}$

5.

Which of the following compounds shows different geometry: 1. TlF3 2. TlCl3 3. TlI3

Answer»

Which of the following compounds shows different geometry:

1. $T l F_{3}$

2. $T l C l_{3}$

3. $T l I_{3}$

Discussion

6.	What are the harmful effects of photochemical smog and how can they be controlled?
Answer» What are the harmful effects of photochemical smog and how can they be controlled?

Discussion

7.	The percentage of free SO3 in an oleum is 60%. The given sample in terms of %H2SO4 can be labelled as :
Answer» The percentage of free $S O_{3}$ in an oleum is $60 %$ . The given sample in terms of $% H_{2} S O_{4}$ can be labelled as :

Discussion

8.	How many all possible optically active tripeptides can be formed using only glycine, L-alanine and L-Tyrosine?
Answer» How many all possible optically active tripeptides can be formed using only glycine, L-alanine and L-Tyrosine?

Discussion

9.	At one time , there was a atomic scale on the assignment of the value 16.0000 to naturally occurring oxygen . The atomic mass of silver on this scale will be A.108.000 B.107.872 C.108.012 D.107.909
Answer» At one time , there was a atomic scale on the assignment of the value 16.0000 to naturally occurring oxygen . The atomic mass of silver on this scale will be A.108.000 B.107.872 C.108.012 D.107.909

9.

At one time , there was a atomic scale on the assignment of the value 16.0000 to naturally occurring oxygen . The atomic mass of silver on this scale will be A.108.000 B.107.872 C.108.012 D.107.909

Answer»

At one time , there was a atomic scale on the assignment of the value 16.0000 to naturally occurring oxygen . The atomic mass of silver on this scale will be

A.108.000

B.107.872

C.108.012

D.107.909

Discussion

10.	Reason for doping of impurities in semiconductors is to
Answer» Reason for doping of impurities in semiconductors is to

Discussion

11.	The final product B in the reaction would be:
Answer» The final product B in the reaction would be:

Discussion

12.	Which of the following is not an aromatic compound?
Answer» Which of the following is not an aromatic compound?

Discussion

13.	Size of the following isoelectronic species increase in the order:
Answer» Size of the following isoelectronic species increase in the order:

Discussion

14.	If n1 and n2 are the boundary value principal quantum numbers of a portion of spectrum of emission spectrum of H atom, determine the wavelength (in metre) corresponding to last line (longest λ). Given : n1+n2=7, n2−n1=3,andRH=1.097×107m−1. (Give your answer in multiple of 10−6)
Answer» If $n_{1}$ and $n_{2}$ are the boundary value principal quantum numbers of a portion of spectrum of emission spectrum of H atom, determine the wavelength (in metre) corresponding to last line (longest $λ$ ). Given : $n_{1} + n_{2} = 7, n_{2} - n_{1} = 3, a n d R_{H} = 1.097 \times 10^{7} m^{- 1} .$ (Give your answer in multiple of $10^{- 6}$ )

Discussion

15.	How to calculate the time taken by an electron to come out of metal surface? explain with an example ?
Answer» How to calculate the time taken by an electron to come out of metal surface? explain with an example ?

Discussion

16.	Which gas will be released when lithium nitride is treated with water ?
Answer» Which gas will be released when lithium nitride is treated with water ?

Discussion

17.	When 20ml of methane and 20ml of oxygen are exploded together and the reaction mixture is cooled to laboratory temperature. The resulting volume of the mixture
Answer» When 20ml of methane and 20ml of oxygen are exploded together and the reaction mixture is cooled to laboratory temperature. The resulting volume of the mixture

Discussion

18.	An unknown organic compound (A) with the molecular formula C9H12O does not decolourize Br2 in CCl4, reacts with sodium to give a colourless, odourless gas and can be oxidised by hot alkaline KMnO4 to give benzoic acid. Then, following test were performed on the compound (A) is given sequence: Test (a): The colour of the solution changes from orange to green when K2Cr2O7 is added to it. Test (b): The compound can be resolved. Test (c): No yellow precipitate of CHl3 is formed when reacted with l2 and OH−. Test (d): Oxidation of the compound with CrO3 in pyridine gives another compound that gives Tollen's test. The structure assigned to compound (A) after the test (d) would be
Answer» An unknown organic compound (A) with the molecular formula $C_{9} H_{12} O$ does not decolourize $B r_{2}$ in $C C l_{4},$ reacts with sodium to give a colourless, odourless gas and can be oxidised by hot alkaline $K M n O_{4}$ to give benzoic acid. Then, following test were performed on the compound (A) is given sequence: Test (a): The colour of the solution changes from orange to green when $K_{2} C r_{2} O_{7}$ is added to it. Test (b): The compound can be resolved. Test (c): No yellow precipitate of $C H l_{3}$ is formed when reacted with $l_{2}$ and $O H^{-}$ . Test (d): Oxidation of the compound with $C r O_{3}$ in pyridine gives another compound that gives Tollen's test. The structure assigned to compound (A) after the test (d) would be

Discussion

19.	A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with Na2CO3 to precipiate the calcium as calcium carbonate. This CaCO3 is heated to convert all the calcium to CaO and the final mass of CaO is 1.62 g. The % by mass of CaCl2 in the original mixture is
Answer» A $10.0 g$ sample of a mixture of calcium chloride and sodium chloride is treated with $N a_{2} C O_{3}$ to precipiate the calcium as calcium carbonate. This $C a C O_{3}$ is heated to convert all the calcium to $C a O$ and the final mass of $C a O$ is $1.62 g$ . The $%$ by mass of $C a C l_{2}$ in the original mixture is

Discussion

20.	For N2(g)+2H2(g)⇌2NH3(g), ΔH is equal to:
Answer» For $N_{2} (g) + 2 H_{2} (g) ⇌ 2 N H_{3} (g)$ , $Δ H$ is equal to:

Discussion

21.	Calculate the molarity of 30 ml of 0.5 M hydrochloric acid diluted to 500ml
Answer» Calculate the molarity of 30 ml of 0.5 M hydrochloric acid diluted to 500ml

Discussion

22.	Is blood homogeneous or heterogeneous. What exactly it is ? I want brief explanation about it.
Answer» Is blood homogeneous or heterogeneous. What exactly it is ? I want brief explanation about it.

22.

Is blood homogeneous or heterogeneous. What exactly it is ? I want brief explanation about it.

Answer»

Is blood homogeneous or heterogeneous. What exactly it is ?

I want brief explanation about it.

Discussion

23.	Which one of the following compounds is more easily hydrolised by KOH and why ? CH3CHClCH2CH3 OR CH3CH2CH2Cl
Answer» Which one of the following compounds is more easily hydrolised by KOH and why ? CH3CHClCH2CH3 OR CH3CH2CH2Cl

23.

Which one of the following compounds is more easily hydrolised by KOH and why ? CH3CHClCH2CH3 OR CH3CH2CH2Cl

Answer»

Which one of the following compounds is more easily hydrolised by KOH and why ?

CH3CHClCH2CH3 OR CH3CH2CH2Cl

Discussion

24.	The equilibrium constant Kc for the reaction N2 (g) + 3H2 (g)⇋ 2NH3 (g) is:
Answer» The equilibrium constant $K_{c}$ for the reaction $N_{2}$ (g) + 3 $H_{2}$ (g) $⇋$ 2 $N H_{3}$ (g) is:

Discussion

25.	Using Oxidation-number method, find the net ionic equation for the following reaction in basic medium: Mn(OH)2(s)+MnO−4(aq)→MnO2(s)
Answer» Using Oxidation-number method, find the net ionic equation for the following reaction in basic medium: $M n (O H)_{2} (s) + M n O_{4}^{-} (a q) \to M n O_{2} (s)$

Discussion

26.	Which of the following are properties of Crystalline solids?
Answer» Which of the following are properties of Crystalline solids?

Discussion

27.	In a collection of H−atoms, all the electrons jump from n=5 to ground level finally (directly or indirectly), without emitting any line in Balmer series. The number of possible different radiations is:
Answer» In a collection of $H - a t o m s$ , all the electrons jump from n=5 to ground level finally (directly or indirectly), without emitting any line in Balmer series. The number of possible different radiations is:

Discussion

28.	Ammonia can be dried by:
Answer» Ammonia can be dried by:

Discussion

29.	What is the procedure or correct formula for finding the molar mass of air if %by volume of oxygen and nitrogen gas is given to be4:1
Answer» What is the procedure or correct formula for finding the molar mass of air if %by volume of oxygen and nitrogen gas is given to be4:1

Discussion

30.	An electron makes a transition from 7th excited state to 2nd energy level in a H-atom sample. Find the maximum spectral lines observed.
Answer» An electron makes a transition from $7^{t h}$ excited state to $2^{n d}$ energy level in a $H$ -atom sample. Find the maximum spectral lines observed.

Discussion

31.	The central atom in OSF4 is
Answer» The central atom in $O S F_{4}$ is

Discussion

32.	Which of the following ion does not form coloured solutions?
Answer» Which of the following ion does not form coloured solutions?

Discussion

33.	Water is a:
Answer» Water is a:

Discussion

34.	In hardening stage of plaster of paris, the change is
Answer» In hardening stage of plaster of paris, the change is

Discussion

35.	Which of the following aqueous solution do you expect to have the lowest freezing point?
Answer» Which of the following aqueous solution do you expect to have the lowest freezing point?

Discussion

36.	Which of the following statement is true?
Answer» Which of the following statement is true?

Discussion

37.	One mole of an organic compound requires half mole of oxygen to give an acid. The compound may be
Answer» One mole of an organic compound requires half mole of oxygen to give an acid. The compound may be

Discussion

38.	Which of the following is monomer of Nylon-6?
Answer» Which of the following is monomer of Nylon-6?

Discussion

39.	Which of the following is an extensive property?
Answer» Which of the following is an extensive property?

Discussion

40.	For a binary ideal solution, the total pressure of the solution is given as
Answer» For a binary ideal solution, the total pressure of the solution is given as

Discussion

41.	An unknown volume and unknown concentration of a weak acid HX is titrated with NaOH of unknown concentration. After addition of 10.0 cm3 of the NaOH solution, the pH of the solution is 5.7. After the addition of 20.0 cm3 of the NaOH solution, the pH is 6.3. Calculate the pKa of the weak acid, HX. (Given: log2 = 0.3, log = 0.5)
Answer» An unknown volume and unknown concentration of a weak acid $H X$ is titrated with $N a O H$ of unknown concentration. After addition of $10.0 {cm}^{3}$ of the $N a O H$ solution, the $p H$ of the solution is 5.7. After the addition of $20.0 {cm}^{3}$ of the $N a O H$ solution, the $p H$ is $6.3$ . Calculate the $p K_{a}$ of the weak acid, HX. (Given: log2 = 0.3, log = 0.5)

Discussion

42.	The degree of hydrolysis of which of the following salt is independent of the concentration of salt solution?
Answer» The degree of hydrolysis of which of the following salt is independent of the concentration of salt solution?

Discussion

43.	The strongest Bronsted base in the following anion is
Answer» The strongest Bronsted base in the following anion is

43.

The strongest Bronsted base in the following anion is

Answer»

The strongest Bronsted base in the following anion is

Discussion

44.	What is the hybridization of P in PCl5(s)?
Answer» What is the hybridization of P in $P C l_{5} (s)$ ?

Discussion

45.	The solubility of BaSO4 in pure water (in gL−1) is closest to [Given : Ksp for BaSO4 is 1.0×10–10 at 25oC. Molecular weight of BaSO4 is 233 gmol–1]
Answer» The solubility of $B a S O_{4}$ in pure water $(i n g L^{- 1})$ is closest to [Given : $K_{s p} f o r B a S O_{4} i s 1.0 \times 10^{- 10} a t 25^{o} C .$ Molecular weight of $B a S O_{4} i s 233 g m o l^{- 1}$ ]

Discussion

46.	H2S is ______ to S:
Answer» $H_{2} S$ is ______ to S:

Discussion

47.	What is the hybridisation of N2O5 in solid state?
Answer» What is the hybridisation of $N_{2} O_{5}$ in solid state?

Discussion

48.	Necessary condition for halogenation in benzene is:
Answer» Necessary condition for halogenation in benzene is:

Discussion

49.	Which of the following gases will have density 1.8 g/L at 760 torr pressure and 27∘C ?
Answer» Which of the following gases will have density 1.8 g/L at 760 torr pressure and $27^{\circ}$ C ?

Discussion

50.	List-IList-II (Titrant required)(I)K2C2O4.NaHC2O4(P)NaOH 200 mL 1 M(0.2 mole)(II)2K2C2O4.H2C2O4(Q)Ca(OH)2 50 mL 2 M(0.1 mole)(III)H2C2O4.2NaHC2O4(R)KMnO4(Acidic medium)(0.05 mole)0.2M, 800 mL(S)KMnO4(Acidic medium)0.2M, 300 mL(T)Ca(OH)2 500 mL 2M(U)NaOH 1000 mL 1M Which of the following options has the correct combination considering List-I and List-II.
Answer» $\begin{matrix} List-I & List-II (Titrant required) (I) & K_{2} C_{2} O_{4} . N a H C_{2} O_{4} & (P) & N a O H 200 m L 1 M (0.2 mole) (I I) & 2 K_{2} C_{2} O_{4} . H_{2} C_{2} O_{4} & (Q) & C a (O H)_{2} 50 m L 2 M (0.1 mole) (I I I) & H_{2} C_{2} O_{4} . 2 N a H C_{2} O_{4} & (R) & K M n O_{4} (Acidic medium) (0.05 mole) & 0.2 M, 800 m L (S) & K M n O_{4} (Acidic medium) 0.2 M, 300 m L (T) & C a (O H)_{2} 500 m L 2 M (U) & N a O H 1000 m L 1 M \end{matrix}$ Which of the following options has the correct combination considering List-I and List-II.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be 14.35 g. The % purity of NaCl solution would be :

When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in:

When glycol is heated with dicarboxylic acid, the products are

n moles of an ideal gas undergoes a process A→B as shown in the figure. The maximum temperature of the gas during the process will be:

Which of the following compounds shows different geometry: 1. TlF3 2. TlCl3 3. TlI3

What are the harmful effects of photochemical smog and how can they be controlled?

The percentage of free SO3 in an oleum is 60%. The given sample in terms of %H2SO4 can be labelled as :

How many all possible optically active tripeptides can be formed using only glycine, L-alanine and L-Tyrosine?

At one time , there was a atomic scale on the assignment of the value 16.0000 to naturally occurring oxygen . The atomic mass of silver on this scale will be A.108.000 B.107.872 C.108.012 D.107.909

Reason for doping of impurities in semiconductors is to

The final product B in the reaction would be:

Which of the following is not an aromatic compound?

Size of the following isoelectronic species increase in the order:

If n1 and n2 are the boundary value principal quantum numbers of a portion of spectrum of emission spectrum of H atom, determine the wavelength (in metre) corresponding to last line (longest λ). Given : n1+n2=7, n2−n1=3,andRH=1.097×107m−1. (Give your answer in multiple of 10−6)

How to calculate the time taken by an electron to come out of metal surface? explain with an example ?

Which gas will be released when lithium nitride is treated with water ?

When 20ml of methane and 20ml of oxygen are exploded together and the reaction mixture is cooled to laboratory temperature. The resulting volume of the mixture

A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with Na2CO3 to precipiate the calcium as calcium carbonate. This CaCO3 is heated to convert all the calcium to CaO and the final mass of CaO is 1.62 g. The % by mass of CaCl2 in the original mixture is

For N2(g)+2H2(g)⇌2NH3(g), ΔH is equal to:

Calculate the molarity of 30 ml of 0.5 M hydrochloric acid diluted to 500ml

Is blood homogeneous or heterogeneous. What exactly it is ? I want brief explanation about it.

Which one of the following compounds is more easily hydrolised by KOH and why ? CH3CHClCH2CH3 OR CH3CH2CH2Cl

The equilibrium constant Kc for the reaction N2 (g) + 3H2 (g)⇋ 2NH3 (g) is:

Using Oxidation-number method, find the net ionic equation for the following reaction in basic medium: Mn(OH)2(s)+MnO−4(aq)→MnO2(s)

Which of the following are properties of Crystalline solids?

In a collection of H−atoms, all the electrons jump from n=5 to ground level finally (directly or indirectly), without emitting any line in Balmer series. The number of possible different radiations is:

Ammonia can be dried by:

What is the procedure or correct formula for finding the molar mass of air if %by volume of oxygen and nitrogen gas is given to be4:1

An electron makes a transition from 7th excited state to 2nd energy level in a H-atom sample. Find the maximum spectral lines observed.

The central atom in OSF4 is

Which of the following ion does not form coloured solutions?

Water is a:

In hardening stage of plaster of paris, the change is

Which of the following aqueous solution do you expect to have the lowest freezing point?

Which of the following statement is true?

One mole of an organic compound requires half mole of oxygen to give an acid. The compound may be

Which of the following is monomer of Nylon-6?

Which of the following is an extensive property?

For a binary ideal solution, the total pressure of the solution is given as

The degree of hydrolysis of which of the following salt is independent of the concentration of salt solution?

The strongest Bronsted base in the following anion is

What is the hybridization of P in PCl5(s)?

The solubility of BaSO4 in pure water (in gL−1) is closest to [Given : Ksp for BaSO4 is 1.0×10–10 at 25oC. Molecular weight of BaSO4 is 233 gmol–1]

H2S is ______ to S:

What is the hybridisation of N2O5 in solid state?

Necessary condition for halogenation in benzene is:

Which of the following gases will have density 1.8 g/L at 760 torr pressure and 27∘C ?