46295 + Interview Questions in Chemistry

1.	A gas is filled in a cylinder, its temperature is increased by 20% on Kelvin scale and volume is reduced by 10%. How much percentage of the gas will leak out
Answer» A gas is filled in a cylinder, its temperature is increased by 20% on Kelvin scale and volume is reduced by 10%. How much percentage of the gas will leak out

Discussion

2.	Choose the reaction(s) from the following options for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:
Answer» Choose the reaction(s) from the following options for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:

Discussion

3.	Which one of the following compound is most likely to give effervescence of CO2 with NaHCO3?
Answer» Which one of the following compound is most likely to give effervescence of $C O_{2}$ with $N a H C O_{3} ?$

Discussion

4.	A fixed mass of an ideal gas contained in a 24.63 L sealed rigid vessel at 1 atm is heated from −73∘ C to 27∘ C. Calculate the change in Gibbs energy if the entropy of the gas is a function of temperature given as, S=2+10−2 T (J/K):(Use 1 atm - L = 0.1 kJ)
Answer» A fixed mass of an ideal gas contained in a 24.63 L sealed rigid vessel at 1 atm is heated from $- 73^{\circ} C$ to $27^{\circ} C$ . Calculate the change in Gibbs energy if the entropy of the gas is a function of temperature given as, $S = 2 + 10^{- 2} T (J/K) : (Use 1 atm - L = 0.1 kJ$ )

Discussion

5.	The compound that will not give Iodoform on treatment with alkali Iodine is
Answer» The compound that will not give Iodoform on treatment with alkali Iodine is

Discussion

6.	For oxidizing alcohols, several oxidants – each with a multivalent central atom as the active species – can be used. When DMSO, with S as the multivalent atom is used in Swern oxidation, how many bonds to oxygen atoms does each central multivalent atom have just before and immediately after the oxidation respectively?
Answer» For oxidizing alcohols, several oxidants – each with a multivalent central atom as the active species – can be used. When DMSO, with S as the multivalent atom is used in Swern oxidation, how many bonds to oxygen atoms does each central multivalent atom have just before and immediately after the oxidation respectively?

Discussion

7.	Which one of the following contains P - O - P bond ?
Answer» Which one of the following contains P - O - P bond ?

Discussion

8.	Which of the following having non-stoichiometric defects?
Answer» Which of the following having non-stoichiometric defects?

Discussion

9.	What means Z effective ? Explain in simple way.
Answer» What means Z effective ? Explain in simple way.

Discussion

10.	Products of this reaction are:
Answer» Products of this reaction are:

Discussion

11.	According to the Dalton's atomic theory : The relative number and kinds of atoms are constant in a given compound. Explain that statement ?
Answer» According to the Dalton's atomic theory : The relative number and kinds of atoms are constant in a given compound. Explain that statement ?

Discussion

12.	The electronic configuration 3p6,3d9 represents a
Answer» The electronic configuration $3 p^{6}, 3 d^{9}$ represents a

Discussion

13.	Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal Ans: 9 how the answer came I want step by step detailed explanation
Answer» Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal Ans: 9 how the answer came I want step by step detailed explanation

13.

Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal Ans: 9 how the answer came I want step by step detailed explanation

Answer»

Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal

Ans: 9

how the answer came

I want step by step detailed explanation

Discussion

14.	If n+l=6; m=0,±1 and s=±12 then what is the maximum number of electrons of an atom of cesium that will have the above set and combination of quantum numbers?(Atomic number of cesium is 55)
Answer» If $n + l = 6$ ; $m = 0, \pm 1$ and $s = \pm \frac{1}{2}$ then what is the maximum number of electrons of an atom of cesium that will have the above set and combination of quantum numbers?(Atomic number of cesium is 55)

Discussion

15.	Which is/are true for ideal solutions?
Answer» Which is/are true for ideal solutions?

Discussion

16.	Among TiF2−6,CoF3−6,Cu2Cl2 and NiCl2−4 the colorless species are
Answer» Among $T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2} a n d N i C l_{4}^{2 -}$ the colorless species are

Discussion

17.	The average kinetic energy of an ideal gas per molecule in SI units at 25∘C will be
Answer» The average kinetic energy of an ideal gas per molecule in SI units at 25 $^{\circ}$ C will be

17.

The average kinetic energy of an ideal gas per molecule in SI units at 25∘C will be

Answer»

The average kinetic energy of an ideal gas per molecule in SI units at 25 $^{\circ}$ C will be

Discussion

18.	B2H6.2NH3Δ−−−→200∘CA+H2. A is as follows
Answer» $B_{2} H_{6} .2 N H_{3} Δ - -- \to 200^{\circ} C A + H_{2}$ . A is as follows

Discussion

19.	SbF6 oxidising number of Sb ClF3 oxidising number of Cl H2PtCl6 oxidising number of Pt H2AsO4(anion) oxidising number of As K3[Fe(CN)6] oxiding number of Fe
Answer» SbF6 oxidising number of Sb ClF3 oxidising number of Cl H2PtCl6 oxidising number of Pt H2AsO4(anion) oxidising number of As K3[Fe(CN)6] oxiding number of Fe

19.

SbF6 oxidising number of Sb ClF3 oxidising number of Cl H2PtCl6 oxidising number of Pt H2AsO4(anion) oxidising number of As K3[Fe(CN)6] oxiding number of Fe

Answer»

SbF6 oxidising number of Sb

ClF3 oxidising number of Cl

H2PtCl6 oxidising number of Pt

H2AsO4(anion) oxidising number of As

K3[Fe(CN)6] oxiding number of Fe

Discussion

20.	In the following compounds, The order to acidity is:
Answer» In the following compounds, The order to acidity is:

Discussion

21.	A compound A of formula C3H6CI2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4. B on oxidation gave a compound of the formula C3H6O2. C with dilute H2SO4 CONTAINING Hg2+ ion gave D of formula C3H6O, which with bromine and NaOH gave the sodium salt of C2H4O2. Then A is:
Answer» A compound A of formula C₃H₆CI₂ on reaction with alkali can give B of formula C₃H₆O or C of formula C₃H₄. B on oxidation gave a compound of the formula C₃H₆O₂. C with dilute H₂SO₄ CONTAINING Hg²⁺ ion gave D of formula C₃H₆O, which with bromine and NaOH gave the sodium salt of C₂H₄O₂. Then A is:

Discussion

22.	Which of the following is the major source of water pollution?
Answer» Which of the following is the major source of water pollution?

Discussion

23.	Decreasing order of stability of O2,O−2,O+2 and O2−2 is :-
Answer» Decreasing order of stability of $O_{2}, O_{2}^{-}, O_{2}^{+}$ and $O_{2}^{2 -}$ is :-

Discussion

24.	The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst flurides of alkali metals, the lowest solubility of LiF in water is due to (a) Ionic nature fo lithium fluoride (b) high lattice enthalpy (c) high hydration enthalpy for lithium ion (d) low ionisation enthalpy of lithium atom
Answer» The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst flurides of alkali metals, the lowest solubility of LiF in water is due to (a) Ionic nature fo lithium fluoride (b) high lattice enthalpy (c) high hydration enthalpy for lithium ion (d) low ionisation enthalpy of lithium atom

Discussion

25.	The compressibility factor of a gas is defined as Z=PV/RT. The compressibility factor of ideal gas is
Answer» The compressibility factor of a gas is defined as Z=PV/RT. The compressibility factor of ideal gas is

25.

The compressibility factor of a gas is defined as Z=PV/RT. The compressibility factor of ideal gas is

Answer»

The compressibility factor of a gas is defined as Z=PV/RT. The compressibility factor of ideal gas is

Discussion

26.	An electron with (rest mass m0) moves with a speed of 0.8 c. Its mass when it moves with this speed is
Answer» An electron with (rest mass $m_{0}$ ) moves with a speed of $0.8 c .$ Its mass when it moves with this speed is

Discussion

27.	Consider the reactions: 2S2O2−3(aq)+I2(s)→S4O2−6(aq)+2I−(aq) S2O2−3(aq)+2Br2(l)+5H2O(l)→2SO2−4(aq)+4Br−(aq)+10H+(aq) Why does the same reductant, thiosulphate react differently with iodine and bromine?
Answer» Consider the reactions: $2 S_{2} O_{3}^{2 -} (a q) + I_{2} (s) \to S_{4} O_{6}^{2 -} (a q) + 2 I^{-} (a q)$ $S_{2} O_{3}^{2 -} (a q) + 2 B r_{2} (l) + 5 H_{2} O (l) \to 2 S O_{4}^{2 -} (a q) + 4 B r^{-} (a q) + 10 H^{+} (a q)$ Why does the same reductant, thiosulphate react differently with iodine and bromine?

27.

Consider the reactions: 2S2O2−3(aq)+I2(s)→S4O2−6(aq)+2I−(aq) S2O2−3(aq)+2Br2(l)+5H2O(l)→2SO2−4(aq)+4Br−(aq)+10H+(aq) Why does the same reductant, thiosulphate react differently with iodine and bromine?

Answer»

Consider the reactions:
$2 S_{2} O_{3}^{2 -} (a q) + I_{2} (s) \to S_{4} O_{6}^{2 -} (a q) + 2 I^{-} (a q)$

$S_{2} O_{3}^{2 -} (a q) + 2 B r_{2} (l) + 5 H_{2} O (l) \to 2 S O_{4}^{2 -} (a q) + 4 B r^{-} (a q) + 10 H^{+} (a q)$
Why does the same reductant, thiosulphate react differently with iodine and bromine?

Discussion

28.	An ideal gas is initially at temperature T and volume V. Its volume is increased by ΔV due to an increase in temperature ΔT, pressure remaining constant. The quantity δ=ΔVVΔT varies with temperature as
Answer» An ideal gas is initially at temperature $T$ and volume $V$ . Its volume is increased by $Δ V$ due to an increase in temperature $Δ T$ , pressure remaining constant. The quantity $δ = \frac{Δ V}{V Δ T}$ varies with temperature as

Discussion

29.	Which of the following is an anionic detergent?
Answer» Which of the following is an anionic detergent?

Discussion

30.	When zeolite (hydrated sodium aluminium silicate), is treated with hard water the sodium ions are exchanged with
Answer» When zeolite (hydrated sodium aluminium silicate), is treated with hard water the sodium ions are exchanged with

30.

When zeolite (hydrated sodium aluminium silicate), is treated with hard water the sodium ions are exchanged with

Answer»

When zeolite (hydrated sodium aluminium silicate), is treated with hard water the sodium ions are exchanged with

Discussion

31.	A body rotating at 20 rad/s is acted upon by a constant torque providing it a deceleration of 2 rad/s2. At what time will the body have kinetic energy same as the initial value if the torque continues to act ?
Answer» A body rotating at 20 rad/s is acted upon by a constant torque providing it a deceleration of 2 rad/ $s^{2}$ . At what time will the body have kinetic energy same as the initial value if the torque continues to act ?

Discussion

32.	Distinguish between stock and flow. Between net investment and capital, which is a stock and which is a flow? Compare net investment and capital with flow of water into a tank.
Answer» Distinguish between stock and flow. Between net investment and capital, which is a stock and which is a flow? Compare net investment and capital with flow of water into a tank.

Discussion

33.	Which one of the following is not a surfactant
Answer» Which one of the following is not a surfactant

Discussion

34.	When m - chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is
Answer» When m - chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is

Discussion

35.	The arrangement of the following compounds: i. Bromomethane ii. Bromoform iii. Chloromethane iv. Dibromomethane
Answer» The arrangement of the following compounds: i. Bromomethane ii. Bromoform iii. Chloromethane iv. Dibromomethane

35.

The arrangement of the following compounds: i. Bromomethane ii. Bromoform iii. Chloromethane iv. Dibromomethane

Answer»

The arrangement of the following compounds:

i. Bromomethane

ii. Bromoform

iii. Chloromethane

iv. Dibromomethane

Discussion

36.	In a reaction of aniline a coloured product C was obtained. The structure of C would be:
Answer» In a reaction of aniline a coloured product C was obtained. The structure of C would be:

36.

In a reaction of aniline a coloured product C was obtained. The structure of C would be:

Answer» In a reaction of aniline a coloured product C was obtained.

The structure of C would be:

Discussion

37.	In which of the following reactions (not balanced) are the products incorrect?
Answer» In which of the following reactions (not balanced) are the products incorrect?

Discussion

38.	3 moles of N2 and 9 moles of H2 are taken in an evacuated vessel. The reaction starts at t=0 and an equillibrium is attained at t=t1. The amount of ammonia is found to be 34 gm at t=2t1. Mark the correct option(s):
Answer» 3 moles of $N_{2}$ and 9 moles of $H_{2}$ are taken in an evacuated vessel. The reaction starts at $t = 0$ and an equillibrium is attained at $t = t_{1}$ . The amount of ammonia is found to be 34 gm at $t = 2 t_{1}$ . Mark the correct option(s):

Discussion

39.	Components of Mg:- 2 Mg(NO3)2 Heated−−−−−→ A–– + B–– + O2− A & B are
Answer» Components of $M g$ :- $2 M g (N O_{3})_{2} H e a t e d - ---- \to A - - + B - - + O_{2 -}$ A & B are

39.

Components of Mg:- 2 Mg(NO3)2 Heated−−−−−→ A–– + B–– + O2− A & B are

Answer»

Components of $M g$ :-

$2 M g (N O_{3})_{2} H e a t e d - ---- \to A - - + B - - + O_{2 -}$ A & B are

Discussion

40.	Write the formula of the compound of iodine which is obtained when conc.HNO3 oxidises I2.
Answer» Write the formula of the compound of iodine which is obtained when $c o n c . H N O_{3}$ oxidises $I_{2}$ .

Discussion

41.	0.5g of fuming H2SO4 oleum is diluted with 100ml of water. This solution is completely neutralised by 26.7ml of 0.4N NaOH. Find mass of SO3 and percentage of free SO3 .
Answer» 0.5g of fuming H₂SO₄oleum is diluted with 100ml of water. This solution is completely neutralised by 26.7ml of 0.4N NaOH. Find mass of SO₃and percentage of free SO₃ .

41.

0.5g of fuming H2SO4 oleum is diluted with 100ml of water. This solution is completely neutralised by 26.7ml of 0.4N NaOH. Find mass of SO3 and percentage of free SO3 .

Answer»

0.5g of fuming H₂SO₄oleum is diluted with 100ml of water. This solution is completely neutralised by 26.7ml of 0.4N NaOH.

Find mass of SO₃and percentage of free SO₃ .

Discussion

42.	Combustion of sucrose is used by aerobic organisms for providing energy for the life substaining process. If all the capturing of energy from the reaction is done through electrical process (non P−V work) then calculate maximum available energy (in kJ) which can be captured by combustion of 34.2 gm of sucrose Given: ΔHcombustion(sucrose)=−6000 kJ mol−1 ΔScombustion=180 JK−1 mol−1 and body temperature is 300 K.
Answer» Combustion of sucrose is used by aerobic organisms for providing energy for the life substaining process. If all the capturing of energy from the reaction is done through electrical process (non $P - V$ work) then calculate maximum available energy (in kJ) which can be captured by combustion of 34.2 gm of sucrose Given: $Δ H_{c o m b u s t i o n} (s u c r o s e) = - 6000 k J m o l^{- 1}$ $Δ S_{c o m b u s t i o n} = 180 J K^{- 1} m o l^{- 1}$ and body temperature is $300 K$ .

Discussion

43.	What type of tyres do F1 cars use?
Answer» What type of tyres do $F_{1}$ cars use?

Discussion

44.	The correct order in which oxygen-oxygen bond dissociation energy increases is
Answer» The correct order in which oxygen-oxygen bond dissociation energy increases is

Discussion

45.	Noble gases are inert and do not form compounds like other elements because of their:
Answer» Noble gases are inert and do not form compounds like other elements because of their:

Discussion

46.	The optical rotation of the α− form of a pyranose is +150.7∘, that of the β form is +52.8∘. In solution an equilibrium mixture of the anomers has an optical rotation of +80.2∘. The percentage of the α− form at equilibrium is
Answer» The optical rotation of the $α -$ form of a pyranose is $+ {150.7}^{\circ},$ that of the $β$ form is $+ {52.8}^{\circ}$ . In solution an equilibrium mixture of the anomers has an optical rotation of $+ {80.2}^{\circ}$ . The percentage of the $α -$ form at equilibrium is

Discussion

47.	Identify ‘Z’ in the following sequence of reactions EthanolPBr3−−−→Xalc.KOH−−−−−→Yi)conc.H2SO4−−−−−−−−→ii)H2OΔZ
Answer» Identify ‘Z’ in the following sequence of reactions $E t h a n o l P B r_{3} - -- \to X a l c . K O H - ---- \to Y i) c o n c . H_{2} S O_{4} - ------- \to i i) H_{2} O Δ Z$

Discussion

48.	A white coloured inorganic salt gives the following reactions. (i) It is soluble in water and the solution has sweet taste. The solution turns black in presence of H2S ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water. iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.
Answer» A white coloured inorganic salt gives the following reactions. (i) It is soluble in water and the solution has sweet taste. The solution turns black in presence of $H_{2} S$ ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water. iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

48.

A white coloured inorganic salt gives the following reactions. (i) It is soluble in water and the solution has sweet taste. The solution turns black in presence of H2S ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water. iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

Answer»

A white coloured inorganic salt gives the following reactions.

(i) It is soluble in water and the solution has sweet taste.
The solution turns black in presence of $H_{2} S$
ii) The solution gives a white precipitate with dilute HCl which is soluble in hot water.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

Discussion

49.	On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following:
Answer» On addition of small amount of $K M n O_{4}$ to concentrated $H_{2} S O_{4}$ , a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following:

Discussion

50.	The aqueous solution of the salt will be colored in the case of:
Answer» The aqueous solution of the salt will be colored in the case of:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A gas is filled in a cylinder, its temperature is increased by 20% on Kelvin scale and volume is reduced by 10%. How much percentage of the gas will leak out

Choose the reaction(s) from the following options for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:

Which one of the following compound is most likely to give effervescence of CO2 with NaHCO3?

A fixed mass of an ideal gas contained in a 24.63 L sealed rigid vessel at 1 atm is heated from −73∘ C to 27∘ C. Calculate the change in Gibbs energy if the entropy of the gas is a function of temperature given as, S=2+10−2 T (J/K):(Use 1 atm - L = 0.1 kJ)

The compound that will not give Iodoform on treatment with alkali Iodine is

Which one of the following contains P - O - P bond ?

Which of the following having non-stoichiometric defects?

What means Z effective ? Explain in simple way.

Products of this reaction are:

According to the Dalton's atomic theory : The relative number and kinds of atoms are constant in a given compound. Explain that statement ?

The electronic configuration 3p6,3d9 represents a

Number of atoms per unit cell if atoms are present at the corner of the unit cell and two atoms at each body diagonal Ans: 9 how the answer came I want step by step detailed explanation

If n+l=6; m=0,±1 and s=±12 then what is the maximum number of electrons of an atom of cesium that will have the above set and combination of quantum numbers?(Atomic number of cesium is 55)

Which is/are true for ideal solutions?

Among TiF2−6,CoF3−6,Cu2Cl2 and NiCl2−4 the colorless species are

The average kinetic energy of an ideal gas per molecule in SI units at 25∘C will be

B2H6.2NH3Δ−−−→200∘CA+H2. A is as follows

SbF6 oxidising number of Sb ClF3 oxidising number of Cl H2PtCl6 oxidising number of Pt H2AsO4(anion) oxidising number of As K3[Fe(CN)6] oxiding number of Fe

In the following compounds, The order to acidity is:

A compound A of formula C3H6CI2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4. B on oxidation gave a compound of the formula C3H6O2. C with dilute H2SO4 CONTAINING Hg2+ ion gave D of formula C3H6O, which with bromine and NaOH gave the sodium salt of C2H4O2. Then A is:

Which of the following is the major source of water pollution?

Decreasing order of stability of O2,O−2,O+2 and O2−2 is :-

The compressibility factor of a gas is defined as Z=PV/RT. The compressibility factor of ideal gas is

An electron with (rest mass m0) moves with a speed of 0.8 c. Its mass when it moves with this speed is

Consider the reactions: 2S2O2−3(aq)+I2(s)→S4O2−6(aq)+2I−(aq) S2O2−3(aq)+2Br2(l)+5H2O(l)→2SO2−4(aq)+4Br−(aq)+10H+(aq) Why does the same reductant, thiosulphate react differently with iodine and bromine?

An ideal gas is initially at temperature T and volume V. Its volume is increased by ΔV due to an increase in temperature ΔT, pressure remaining constant. The quantity δ=ΔVVΔT varies with temperature as

Which of the following is an anionic detergent?

When zeolite (hydrated sodium aluminium silicate), is treated with hard water the sodium ions are exchanged with

A body rotating at 20 rad/s is acted upon by a constant torque providing it a deceleration of 2 rad/s2. At what time will the body have kinetic energy same as the initial value if the torque continues to act ?

Distinguish between stock and flow. Between net investment and capital, which is a stock and which is a flow? Compare net investment and capital with flow of water into a tank.

Which one of the following is not a surfactant

When m - chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is

The arrangement of the following compounds: i. Bromomethane ii. Bromoform iii. Chloromethane iv. Dibromomethane

In a reaction of aniline a coloured product C was obtained. The structure of C would be:

In which of the following reactions (not balanced) are the products incorrect?

3 moles of N2 and 9 moles of H2 are taken in an evacuated vessel. The reaction starts at t=0 and an equillibrium is attained at t=t1. The amount of ammonia is found to be 34 gm at t=2t1. Mark the correct option(s):

Components of Mg:- 2 Mg(NO3)2 Heated−−−−−→ A–– + B–– + O2− A &amp; B are

Write the formula of the compound of iodine which is obtained when conc.HNO3 oxidises I2.

0.5g of fuming H2SO4 oleum is diluted with 100ml of water. This solution is completely neutralised by 26.7ml of 0.4N NaOH. Find mass of SO3 and percentage of free SO3 .

What type of tyres do F1 cars use?

The correct order in which oxygen-oxygen bond dissociation energy increases is

Noble gases are inert and do not form compounds like other elements because of their:

The optical rotation of the α− form of a pyranose is +150.7∘, that of the β form is +52.8∘. In solution an equilibrium mixture of the anomers has an optical rotation of +80.2∘. The percentage of the α− form at equilibrium is

Identify ‘Z’ in the following sequence of reactions EthanolPBr3−−−→Xalc.KOH−−−−−→Yi)conc.H2SO4−−−−−−−−→ii)H2OΔZ

On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following:

The aqueous solution of the salt will be colored in the case of:

Components of Mg:- 2 Mg(NO3)2 Heated−−−−−→ A–– + B–– + O2− A & B are