46295 + Interview Questions in Chemistry

1.	A solution is 0.1 M in each KCl, KBr and K2CrO4 to this solution, solid AgNO3 is gradually added. Assuming that there is no change in the volume of the solution given, The concentration (in M) of first ion when the second ion starts precipitating is about . Given: Ksp of AgCl = 1.7×10−10 Ksp of AgBr = 5.0×10−13 Ksp (K2CrO4)=1.9×10−12
Answer» A solution is 0.1 M in each $K C l$ , $K B r$ and $K _{2} C r O_{4}$ to this solution, solid $A g N O_{3}$ is gradually added. Assuming that there is no change in the volume of the solution given, The concentration (in M) of first ion when the second ion starts precipitating is about . Given: Ksp of $A g C l$ = $1.7 \times 10^{- 10}$ Ksp of $A g B r$ = $5.0 \times 10^{- 13}$ Ksp $(K_{2} C r O_{4}) = 1.9 \times 10^{- 12}$

Discussion

2.	The standard heat of formation (ΔfH∘298) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286 kJ/mol, respectively, is
Answer» The standard heat of formation $(Δ_{f} H_{298}^{\circ})$ of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286 kJ/mol, respectively, is

Discussion

3.	How many millimoles of HSCN will react with iodine, so that the produced I− will react with 10 ml of neutral 0.2 M KMnO4?
Answer» How many millimoles of $H S C N$ will react with iodine, so that the produced $I^{-}$ will react with $10 ml$ of neutral $0.2 M K M n O_{4}$ ?

Discussion

4.	For silver metal, the threshold frequency vo is 1.12×1017 Hz. What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of 15.0 oA wavelength on the metal?
Answer» For silver metal, the threshold frequency $v_{o}$ is $1.12 \times 10^{17} Hz$ . What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of $15.0 o A$ wavelength on the metal?

Discussion

5.	Amongst the following groups of oxide, the group containing oxides that cannot be reduced by carbon to give the respective metal is
Answer» Amongst the following groups of oxide, the group containing oxides that cannot be reduced by carbon to give the respective metal is

Discussion

6.	Choose the correct structure of 3-bromo-4-chloro-2-methylpent-2-ene:
Answer» Choose the correct structure of 3-bromo-4-chloro-2-methylpent-2-ene:

Discussion

7.	Consider the Atwood machine of the previous problem. The larger mass is stopped for a moment 2.0 s after the system is set into motion. Find the time elapsed before the string is tight again.
Answer» Consider the Atwood machine of the previous problem. The larger mass is stopped for a moment 2.0 s after the system is set into motion. Find the time elapsed before the string is tight again.

Discussion

8.	How many H atoms can be exchanged by deuterium when the shown compound is kept with OD−/D2O?
Answer» How many $H$ atoms can be exchanged by deuterium when the shown compound is kept with $O D^{-} / D_{2} O$ ?

Discussion

9.	H2 is an element or a molecule?
Answer» $H_{2}$ is an element or a molecule?

Discussion

10.	Among the following, the aromatic compound is:
Answer» Among the following, the aromatic compound is:

Discussion

11.	The strength of sigma bonds formed by the axial overlap of s - or p - orbitals of 2nd shell of the participating atoms decreases as:
Answer» The strength of sigma bonds formed by the axial overlap of $s$ - or $p$ - orbitals of $2^{n d}$ shell of the participating atoms decreases as:

11.

The strength of sigma bonds formed by the axial overlap of s - or p - orbitals of 2nd shell of the participating atoms decreases as:

Answer»

The strength of sigma bonds formed by the axial overlap of $s$ - or $p$ - orbitals of $2^{n d}$ shell of the participating atoms decreases as:

Discussion

12.	A mixture of CO and CO2 is found to have a density of 1.5g/litre at 30∘c and 730 torr. What is the composition of mixture?
Answer» A mixture of CO and $C O_{2}$ is found to have a density of 1.5g/litre at $30^{\circ} c$ and 730 torr. What is the composition of mixture?

Discussion

13.	C6H5CH2CH2CH3 is when oxidised in the presence of alk. KMnO4, the product obtained is
Answer» $C_{6} H_{5} C H_{2} C H_{2} C H_{3}$ is when oxidised in the presence of alk. $K M n O_{4},$ the product obtained is

Discussion

14.	Acetic acid CH3COOH can form a dimer (CH3COOH)2 in the gas phase. The dimer is held together by two H-bonds with a total strenght of 66.5 kJ per mol of dimer If at 25oC, the equilibrium constant for the dimerization is 1.3×103. Calculate △So for the reaction: 2CH3COOH(g)⇌(CH3COOH)2(g)
Answer» Acetic acid $C H_{3} C O O H$ can form a dimer $(C H_{3} C O O H)_{2}$ in the gas phase. The dimer is held together by two H-bonds with a total strenght of 66.5 kJ per mol of dimer If at $25^{o} C,$ the equilibrium constant for the dimerization is $1.3 \times 10^{3} .$ Calculate $△ S^{o}$ for the reaction: $2 C H_{3} C O O H (g) ⇌ (C H_{3} C O O H)_{2} (g)$

Discussion

15.	what is the order of basic strength for amines in different mediums and also does it vary with increse in the size of alkyl group
Answer» what is the order of basic strength for amines in different mediums and also does it vary with increse in the size of alkyl group

Discussion

16.	The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by
Answer» The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by

Discussion

17.	Please explain how to find the ionization energy of the elements and how to draw the graph for them.
Answer» Please explain how to find the ionization energy of the elements and how to draw the graph for them.

Discussion

18.	Among the following species, how many have their ionic size greater than O2−?___ Se2−,F−,N3−,P3−
Answer» Among the following species, how many have their ionic size greater than $O^{2 -}$ ?___ $S e^{2 -}, F^{-}, N^{3 -}, P^{3 -}$

18.

Among the following species, how many have their ionic size greater than O2−?___ Se2−,F−,N3−,P3−

Answer»

Among the following species, how many have their ionic size greater than $O^{2 -}$ ?___

$S e^{2 -}, F^{-}, N^{3 -}, P^{3 -}$

Discussion

19.	The minimum mass of mixture of A2 and B4 required to produce at least 1 kg of each product is : (Given Atomic mass of 'A' = 10; At mass of 'B' = 120) 5A2+2B4→2AB2+4A2B
Answer» The minimum mass of mixture of $A_{2}$ and $B_{4}$ required to produce at least $1 k g$ of each product is : (Given Atomic mass of 'A' = 10; At mass of 'B' = 120) $5 A_{2} + 2 B_{4} \to 2 A B_{2} + 4 A_{2} B$

Discussion

20.	Fajan rule in nacl and cucl I didn't understand even after seeing the video...
Answer» Fajan rule in nacl and cucl I didn't understand even after seeing the video...

Discussion

21.	Which of these statements about [Co(CN)6]3− is true?
Answer» Which of these statements about $[C o (C N)_{6}]^{3 -}$ is true?

Discussion

22.	What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 in the He⊕ spectrum?
Answer» What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 in the $H e^{\oplus}$ spectrum?

Discussion

23.	The amount of H2O2 present in 1L of 1.5 N H2O2 is ?
Answer» The amount of $H_{2} O_{2}$ present in 1L of 1.5 N $H_{2} O_{2}$ is ?

Discussion

24.	Write the structures of A, B and C in the following reactions: (i)C6H5 −COO−NH4+△−−→ ABr2/KOH−−−−−−→ BCH3COCl/pyridine−−−−−−−−−−−−→ C(ii)C6H5N2+BF4−NaNO2/Cu−−−−−−−−−−→△ASn/HCl−−−−−→ BCHCl3+alc.KOH−−−−−−−−−−−→ C
Answer» Write the structures of A, B and C in the following reactions: $\begin{matrix} (i) & C_{6} H_{5} - & C O O^{-} {N H_{4}}^{+} & △ - - \to & A & B r_{2} / K O H - ----- \to & B & C H_{3} C O C l / p y r i d i n e - ----------- \to & C (i i) & C_{6} H_{5} {N_{2}}^{+} {B F_{4}}^{-} & N a N O_{2} / C u - --------- \to △ & A & S n / H C l - ---- \to & B & C H C l_{3} + a l c . K O H - ---------- \to & C \end{matrix}$

Discussion

25.	Find the no of functions from AtoB if set A has m elements and set B has n elements
Answer» Find the no of functions from AtoB if set A has m elements and set B has n elements

Discussion

26.	Two masses M and m are suspended together by a massless spring of spring constant k. When the masses are in equilibrium, M is removed without disturbing the system. The maximum speed of m during oscillations is (Answer in terms of M,m,k and g)
Answer» Two masses M and m are suspended together by a massless spring of spring constant k. When the masses are in equilibrium, M is removed without disturbing the system. The maximum speed of m during oscillations is (Answer in terms of M,m,k and g)

26.

Two masses M and m are suspended together by a massless spring of spring constant k. When the masses are in equilibrium, M is removed without disturbing the system. The maximum speed of m during oscillations is (Answer in terms of M,m,k and g)

Answer»

Two masses M and m are suspended together by a massless spring of spring constant k. When the masses are in equilibrium, M is removed without disturbing the system. The maximum speed of m during oscillations is

(Answer in terms of M,m,k and g)

Discussion

27.	As we know that if size of atomic radii increases, I.E decreases. But why it is said in a random topic that I.E increases down the group?
Answer» As we know that if size of atomic radii increases, I.E decreases. But why it is said in a random topic that I.E increases down the group?

Discussion

28.	What is the co-ordination number of Mn in [Mn2(CO)10]?How.
Answer» What is the co-ordination number of Mn in [Mn₂(CO)₁₀]?How.

Discussion

29.	Face centered and body centered unit cell are types of
Answer» Face centered and body centered unit cell are types of

Discussion

30.	Which of the following represents the correct order of filling the molecular orbitals of B2,C2 and N2 ?
Answer» Which of the following represents the correct order of filling the molecular orbitals of $B_{2}, C_{2}$ and $N_{2}$ ?

Discussion

31.	The reagent(s) used for the conversion of benzene diazonium hydrogensulfate to benzene is/are:
Answer» The reagent(s) used for the conversion of benzene diazonium hydrogensulfate to benzene is/are:

Discussion

32.	The number of products possible for x (including stereomers)in the following reaction is:___
Answer» The number of products possible for x (including stereomers)in the following reaction is:___

Discussion

33.	Which of the following solutions has osmotic pressure near to that of equi-molal solution of K4[Fe(CN)6]?
Answer» Which of the following solutions has osmotic pressure near to that of equi-molal solution of $K_{4} [F e (C N)_{6}]$ ?

Discussion

34.	The weight of a molecule of C60H22 is:
Answer» The weight of a molecule of $C_{60} H_{22}$ is:

Discussion

35.	Compare the 2 methods shown for the preparation of carboxylic acids Method 1: RBrMg−−−−−−−→diethyl etherRMgBr(i)CO2−−−−→(ii)H3O+RCOOH Method 2: RBrNaCN−−−−→RCNH2O,HCl−−−−−−→ΔRCOOH Which one of the following statements correctly describes this conversion?
Answer» Compare the 2 methods shown for the preparation of carboxylic acids $M e t h o d 1 : R B r M g - ------ \to d i e t h y l e t h e r R M g B r (i) C O_{2} - --- \to (i i) H_{3} O + R C O O H$ $M e t h o d 2 : R B r N a C N - --- \to R C N H_{2} O, H C l - ----- \to Δ R C O O H$ Which one of the following statements correctly describes this conversion?

Discussion

36.	The Haber's process for the manufacture of ammonia is usually carried out at about 5000C. If a temperature of about 2500C was used instead of 5000C -
Answer» The Haber's process for the manufacture of ammonia is usually carried out at about 500⁰C. If a temperature of about 250⁰C was used instead of 500⁰C -

Discussion

37.	But - 1 - ene is selectively formed by the action of Alcoholic - KOH on
Answer» But - 1 - ene is selectively formed by the action of Alcoholic - KOH on

Discussion

38.	Oxidation states of the metal in the minerals hematite and magnetite, respectively are.
Answer» Oxidation states of the metal in the minerals hematite and magnetite, respectively are.

Discussion

39.	C2H5OH+SOCl2Pyridine−−−−−→x+y+z. In this reaction x, y and z respectively are
Answer» $C_{2} H_{5} O H + S O C l_{2} P y r i d i n e - ---- \to x + y + z .$ In this reaction x, y and z respectively are

Discussion

40.	When NaCl is dissolved in water the sodium ion gets
Answer» When NaCl is dissolved in water the sodium ion gets

Discussion

41.	Which of the following is not a coordination compound?
Answer» Which of the following is not a coordination compound?

Discussion

42.	The major organic product formed from the following reaction is:
Answer» The major organic product formed from the following reaction is:

Discussion

43.	Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in gm) is [EAMCET 1991]
Answer» Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in gm) is [EAMCET 1991]

43.

Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in gm) is [EAMCET 1991]

Answer»

Three faradays electricity was passed through an aqueous solution of iron (II)

bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in

gm) is

[EAMCET 1991]

Discussion

44.	The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by[NCERT 1984; AFMC 1988]
Answer» The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by [NCERT 1984; AFMC 1988]

44.

The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by[NCERT 1984; AFMC 1988]

Answer»

The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by

[NCERT 1984; AFMC 1988]

Discussion

45.	A salt which gives CO2 with hot H2SO4 and also decolourises acidified KMnO4 on warming is:
Answer» A salt which gives $C O_{2}$ with hot $H_{2} S O_{4}$ and also decolourises acidified $K M n O_{4}$ on warming is:

Discussion

46.	An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy
Answer» An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy

Discussion

47.	According to Lewis theory the ligands are
Answer» According to Lewis theory the ligands are

Discussion

48.	Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:
Answer» Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:

Discussion

49.	If an electron has spin quantum number of + 1/2 and a magnetic quantum number of -1, it cannot be represented in an
Answer» If an electron has spin quantum number of + 1/2 and a magnetic quantum number of -1, it cannot be represented in an

Discussion

50.	Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile ?
Answer» Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The standard heat of formation (ΔfH∘298) of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286 kJ/mol, respectively, is

How many millimoles of HSCN will react with iodine, so that the produced I− will react with 10 ml of neutral 0.2 M KMnO4?

For silver metal, the threshold frequency vo is 1.12×1017 Hz. What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of 15.0 oA wavelength on the metal?

Amongst the following groups of oxide, the group containing oxides that cannot be reduced by carbon to give the respective metal is

Choose the correct structure of 3-bromo-4-chloro-2-methylpent-2-ene:

Consider the Atwood machine of the previous problem. The larger mass is stopped for a moment 2.0 s after the system is set into motion. Find the time elapsed before the string is tight again.

How many H atoms can be exchanged by deuterium when the shown compound is kept with OD−/D2O?

H2 is an element or a molecule?

Among the following, the aromatic compound is:

The strength of sigma bonds formed by the axial overlap of s - or p - orbitals of 2nd shell of the participating atoms decreases as:

A mixture of CO and CO2 is found to have a density of 1.5g/litre at 30∘c and 730 torr. What is the composition of mixture?

C6H5CH2CH2CH3 is when oxidised in the presence of alk. KMnO4, the product obtained is

Acetic acid CH3COOH can form a dimer (CH3COOH)2 in the gas phase. The dimer is held together by two H-bonds with a total strenght of 66.5 kJ per mol of dimer If at 25oC, the equilibrium constant for the dimerization is 1.3×103. Calculate △So for the reaction: 2CH3COOH(g)⇌(CH3COOH)2(g)

what is the order of basic strength for amines in different mediums and also does it vary with increse in the size of alkyl group

The molal elevation constant for water is 0.512Kkg/mol. If one mole of glucose is dissolved in 100g of water the boiling point is elevated by

Please explain how to find the ionization energy of the elements and how to draw the graph for them.

Among the following species, how many have their ionic size greater than O2−?___ Se2−,F−,N3−,P3−

The minimum mass of mixture of A2 and B4 required to produce at least 1 kg of each product is : (Given Atomic mass of 'A' = 10; At mass of 'B' = 120) 5A2+2B4→2AB2+4A2B

Fajan rule in nacl and cucl I didn't understand even after seeing the video...

Which of these statements about [Co(CN)6]3− is true?

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 in the He⊕ spectrum?

The amount of H2O2 present in 1L of 1.5 N H2O2 is ?

Find the no of functions from AtoB if set A has m elements and set B has n elements

Two masses M and m are suspended together by a massless spring of spring constant k. When the masses are in equilibrium, M is removed without disturbing the system. The maximum speed of m during oscillations is (Answer in terms of M,m,k and g)

As we know that if size of atomic radii increases, I.E decreases. But why it is said in a random topic that I.E increases down the group?

What is the co-ordination number of Mn in [Mn​​​​​2(CO)10]?How.

Face centered and body centered unit cell are types of

Which of the following represents the correct order of filling the molecular orbitals of B2,C2 and N2 ?

The reagent(s) used for the conversion of benzene diazonium hydrogensulfate to benzene is/are:

The number of products possible for x (including stereomers)in the following reaction is:___

Which of the following solutions has osmotic pressure near to that of equi-molal solution of K4[Fe(CN)6]?

The weight of a molecule of C60H22 is:

The Haber's process for the manufacture of ammonia is usually carried out at about 5000C. If a temperature of about 2500C was used instead of 5000C -

But - 1 - ene is selectively formed by the action of Alcoholic - KOH on

Oxidation states of the metal in the minerals hematite and magnetite, respectively are.

C2H5OH+SOCl2Pyridine−−−−−→x+y+z. In this reaction x, y and z respectively are

When NaCl is dissolved in water the sodium ion gets

Which of the following is not a coordination compound?

The major organic product formed from the following reaction is:

Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in gm) is [EAMCET 1991]

The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by[NCERT 1984; AFMC 1988]

A salt which gives CO2 with hot H2SO4 and also decolourises acidified KMnO4 on warming is:

An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy

According to Lewis theory the ligands are

Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:

If an electron has spin quantum number of + 1/2 and a magnetic quantum number of -1, it cannot be represented in an

Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile ?

What is the co-ordination number of Mn in [Mn2(CO)10]?How.