46295 + Interview Questions in Chemistry

1.	For the estimation of nitrogen, 0.7 g of an organic compound was digested by Kjeldhal's method and the evolved ammonia was passed in 100 mL of 0.1 M sulphuric acid. The excess acid required 10 mL of 0.5 M Ba(OH)2 for complete neutralization. The percentage of nitrogen in the compound is:
Answer» For the estimation of nitrogen, 0.7 g of an organic compound was digested by Kjeldhal's method and the evolved ammonia was passed in 100 mL of 0.1 M sulphuric acid. The excess acid required 10 mL of 0.5 M $B a (O H)_{2}$ for complete neutralization. The percentage of nitrogen in the compound is:

Discussion

2.	A reactant (A) forms two products:Ak1−→B, Activation energy Ea1Ak2−→C, Activation energy Ea2If Ea2=2Ea1, then k1 and k2 are related as:
Answer» A reactant (A) forms two products: $A k_{1} - \to B, Activation energy E a_{1}$ $A k_{2} - \to C, Activation energy E a_{2}$ If $E a_{2} = 2 E a_{1}$ , then $k_{1}$ and $k_{2}$ are related as:

Discussion

3.	Can hexadentate Ligand act as a pentadentate or tetradentate?
Answer» Can hexadentate Ligand act as a pentadentate or tetradentate?

Discussion

4.	61 What is self oxidation reduction reaction of aldehyde
Answer» 61 What is self oxidation reduction reaction of aldehyde

Discussion

5.	An acid type indicator, Hln differs in colour from its conjugate base (In−). The human eye is sensitive to colour differences only when the ratio [In−][Hln] is greater than 10 or smaller than 0.1. What would be the minimum change in pH of the solution to observe a complete colour change (Ka = 1.0 × 10−5) ?
Answer» An acid type indicator, Hln differs in colour from its conjugate base ( $I n^{-}$ ). The human eye is sensitive to colour differences only when the ratio $\frac{[I n^{-}]}{[H l n]}$ is greater than 10 or smaller than 0.1. What would be the minimum change in pH of the solution to observe a complete colour change ( $K_{a}$ = $1.0 \times 10^{- 5}$ ) ?

Discussion

6.	Ifthe solubility product of CuS is 6 × 10−16,calculate the maximum molarity of CuS in aqueous solution.
Answer» If the solubility product of CuS is 6 × 10⁻¹⁶, calculate the maximum molarity of CuS in aqueous solution.

Discussion

7.	How is silica glass prepared? Why is silica glass used to prepare laboratory glass-wares?
Answer» How is silica glass prepared? Why is silica glass used to prepare laboratory glass-wares?

Discussion

8.	A compound of A and B crystallizes in a cubic lattice in which A atoms occupy the lattice points at the corners of the cube and two atoms of B occupy the center of each of the cube faces. What is the formula of this compound ?
Answer» A compound of $A$ and $B$ crystallizes in a cubic lattice in which A atoms occupy the lattice points at the corners of the cube and two atoms of $B$ occupy the center of each of the cube faces. What is the formula of this compound ?

Discussion

9.	pH of 0.1 M solution of NH_4CN solution is x. If its concentration is increased to 0.2 M then pH of the solution will be (1) 2x (2) x/2 (3) x (4) x/4
Answer» pH of 0.1 M solution of NH_4CN solution is x. If its concentration is increased to 0.2 M then pH of the solution will be (1) 2x (2) x/2 (3) x (4) x/4

Discussion

10.	The amount of heat energy Q, used to heat up a substance depends on its mass m, its specific heat capacity (s) and change in temperature 'Delta T' of the substance. Using dimensional method find the expression for 's'??
Answer» The amount of heat energy Q, used to heat up a substance depends on its mass m, its specific heat capacity (s) and change in temperature 'Delta T' of the substance. Using dimensional method find the expression for 's'??

Discussion

11.	Why is cooling produced when a liquid evaporates?
Answer» Why is cooling produced when a liquid evaporates?

Discussion

12.	Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.
Answer» Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

12.

Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Answer»

Distinguish between the
meaning of the terms adsorption and absorption.

Give one example of
each.

Discussion

13.	Choose the correct statement with respect to liquids or the liquid state:
Answer» Choose the correct statement with respect to liquids or the liquid state:

Discussion

14.

Match the column:Column IColumn II(a) NH−2(p) μ=0(b) NH+4(q) Planar(c) I−3(r) dx2−y2 is involved in hybridization(d) PCl−6(s) dz2 is involved in hybridization(e) PCl+2(t) Bent structure

Answer»

Match the column:

Column I	Column II
(a) $N H_{2}^{-}$	(p) $μ = 0$
(b) $N H_{4}^{+}$	(q) Planar
(c) $I_{3}^{-}$	(r) $d_{x^{2} - y^{2}}$ is involved in hybridization
(d) $P C l_{6}^{-}$	(s) $d_{z^{2}}$ is involved in hybridization
(e) $P C l_{2}^{+}$	(t) Bent structure

Discussion

15.	Which of the following element is isodiaphere of 23892U?
Answer» Which of the following element is isodiaphere of $_{92}^{238} U$ ?

Discussion

16.	Why order of reactivity in borodine hunsdiecker rea tion is 1^°>2^°>3^° Which is opposite to order shown in nost of other rections
Answer» Why order of reactivity in borodine hunsdiecker rea tion is 1^°>2^°>3^° Which is opposite to order shown in nost of other rections

Discussion

17.	The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?
Answer» The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

Discussion

18.	lesser the value of ionisation enthalpy,greater the tendency of atom to form cation.why is this so?
Answer» lesser the value of ionisation enthalpy,greater the tendency of atom to form cation.why is this so?

Discussion

19.	An ethanolic solution of naphthalene contains0.25 mole fraction of solute. Molality of solution is(1) 5.92 m(2) 3.39 m(3) 7.25 m(4) 9.47 m
Answer» An ethanolic solution of naphthalene contains0.25 mole fraction of solute. Molality of solution is(1) 5.92 m(2) 3.39 m(3) 7.25 m(4) 9.47 m

Discussion

20.	4.Oxidation number of phosphorus in H3po4
Answer» 4.Oxidation number of phosphorus in H3po4

Discussion

21.	The structure of NaCI crystal is(1) Body centred cubic lattice(2) Face centred cubic lattice(3) Octahedral(4) Simple cubic lattice
Answer» The structure of NaCI crystal is(1) Body centred cubic lattice(2) Face centred cubic lattice(3) Octahedral(4) Simple cubic lattice

Discussion

22.	In the oxygen dissociation curve featuring %saturation of Hb. and PO2, why is the PO2 40 mm Hg when %saturation is 75%?
Answer» In the oxygen dissociation curve featuring %saturation of Hb. and PO2, why is the PO2 40 mm Hg when %saturation is 75%?

Discussion

23.	Find dE/dy where E=1/4pie0×2qy/(a^2+y^2)^3/2
Answer» Find dE/dy where E=1/4pie0×2qy/(a^2+y^2)^3/2

Discussion

24.	Light of wavelength λ falls on metal having work function hcλ0. Photoelectric effect will take place only if:
Answer» Light of wavelength $λ$ falls on metal having work function $\frac{h c}{λ_{0}}$ . Photoelectric effect will take place only if:

Discussion

25.	71 Steric inhibition of resonance can affect dipole moment of an organic compound.Explain how this happens?
Answer» 71 Steric inhibition of resonance can affect dipole moment of an organic compound.Explain how this happens?

Discussion

26.	2 mol of CO was in the small cubical container of length, l=′a′ at 57 ∘C. The Gas was taken out completely from the small container and put into large container (l=′2a′) at the same temperature. What is the change in entropy, if it is assumed that the process is reversible and gas is behaving as an ideal one? (Take ln2=0.7, ln3=1.1, R=253J mol−1 K−1
Answer» 2 mol of $C O$ was in the small cubical container of length, $l =^{'} a^{'}$ at $57^{\circ} C$ . The Gas was taken out completely from the small container and put into large container $(l =^{'} 2 a^{'})$ at the same temperature. What is the change in entropy, if it is assumed that the process is reversible and gas is behaving as an ideal one? (Take $l n 2 = 0.7, l n 3 = 1.1, R = \frac{25}{3} J m o l^{- 1} K^{- 1}$

Discussion

27.	For the reaction CO(g)+(1/2)O2(g)⇌CO2(g),Kp/Kc is
Answer» For the reaction $C O (g) + (1 / 2) O_{2} (g) ⇌ C O_{2} (g), K_{p} / K_{c}$ is

Discussion

28.	Benzyl phenyl ether (PhCH2OPh) on cleavage with HI gives:
Answer» Benzyl phenyl ether (PhCH₂OPh) on cleavage with HI gives:

Discussion

29.	Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a 10% solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.Gold number of hemoglobin is 0.03. Hence 100 mL of gold sol will require what amount of hemoglobin (in g) so that gold is not coagulated by 1 mL of 10% NaCl solution
Answer» Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols. Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number. Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a $10 %$ solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power. Gold number of hemoglobin is 0.03. Hence 100 mL of gold sol will require what amount of hemoglobin (in g) so that gold is not coagulated by 1 mL of $10 % N a C l$ solution

Discussion

30.	Which of the following oxides of chromium is amphoteric in nature
Answer» Which of the following oxides of chromium is amphoteric in nature

Discussion

31.	For the plot of ln k versus 1/T of Arrhenius equation, the slope and y-intercept are respectively.
Answer» For the plot of $l n k versus 1 / T$ of Arrhenius equation, the slope and y-intercept are respectively.

Discussion

32.	The number of elements that do not have completely filled d subshell among the elements Ni,Pd,Pt,Cu,Ag,Au,Zn,Cd and Hg are
Answer» The number of elements that do not have completely filled d subshell among the elements $N i, P d, P t, C u, A g, A u, Z n, C d and H g$ are

Discussion

33.	NH4Cl crystallizes in a body centred cubic lattice , with a unit cell distance of 387 pm. Calculate the radius of the NH+4 ion if the radius of the Cl− ion is 181 pm.
Answer» $N H_{4} C l$ crystallizes in a body centred cubic lattice , with a unit cell distance of $387 p m$ . Calculate the radius of the $N H_{4}^{+}$ ion if the radius of the $C l^{-}$ ion is $181 p m$ .

Discussion

34.	A particle is moving in a circular path with uniform speed. Is its kinetic energy same at all points?
Answer» A particle is moving in a circular path with uniform speed. Is its kinetic energy same at all points?

Discussion

35.	What does zero order reaction mean?
Answer» What does zero order reaction mean?

Discussion

36.	If Z = 3, what would be the valency of the element? Also, name the element.
Answer» If Z = 3, what would be the valency of the element? Also, name the element.

Discussion

37.	The heat of combustion of CH_4(g), C(s) and H_2(g) at 25^{0 }C are -212.4 Kcal, -94.0 Kcal and -68.4 Kcal respectively, the heat of formation of CH_4 will be (1) +54.4 Kcal (2) -18.4 Kcal (3) -375.2 Kcal (4) +212.8 Kcal
Answer» The heat of combustion of CH_4(g), C(s) and H_2(g) at 25^{0 }C are -212.4 Kcal, -94.0 Kcal and -68.4 Kcal respectively, the heat of formation of CH_4 will be (1) +54.4 Kcal (2) -18.4 Kcal (3) -375.2 Kcal (4) +212.8 Kcal

Discussion

38.	(9 mL\) of mixture of methane and ethylene when exploded with 30ml (excess) of Oxygen. After Cooling the volume was 21.0ml. Further treatment with caustic potash reduced the volume to 7ml. The amounts of methane and ethylene is the mixture respectively are
Answer» (9 mL\) of mixture of methane and ethylene when exploded with $30 m l$ (excess) of Oxygen. After Cooling the volume was $21.0 m l$ . Further treatment with caustic potash reduced the volume to $7 m l$ . The amounts of methane and ethylene is the mixture respectively are

38.

(9 mL\) of mixture of methane and ethylene when exploded with 30ml (excess) of Oxygen. After Cooling the volume was 21.0ml. Further treatment with caustic potash reduced the volume to 7ml. The amounts of methane and ethylene is the mixture respectively are

Answer»

(9 mL\) of mixture of methane and ethylene when exploded with $30 m l$ (excess) of Oxygen. After

Cooling the volume was $21.0 m l$ . Further treatment with caustic potash reduced the volume to $7 m l$ .

The amounts of methane and ethylene is the mixture respectively are

Discussion

39.	The enthalpy of atomisation of CH4 and C2H6 are 360 and 620 k cal mol−1 respectively. The C - C bond energy is expected to be ?
Answer» The enthalpy of atomisation of $C H_{4}$ and $C_{2} H_{6}$ are 360 and 620 k cal $m o l^{- 1}$ respectively. The C - C bond energy is expected to be ?

Discussion

40.	Column 1: Name and formula of compound ColumnColumn 2: Name of the reaction.Column 3: Major product of reaction.The only correct combination in which the reaction intermediate is Carbene:
Answer» Column 1: Name and formula of compound Column Column 2: Name of the reaction. Column 3: Major product of reaction. The only correct combination in which the reaction intermediate is Carbene:

40.

Column 1: Name and formula of compound ColumnColumn 2: Name of the reaction.Column 3: Major product of reaction.The only correct combination in which the reaction intermediate is Carbene:

Answer»

Column 1: Name and formula of compound Column

Column 2: Name of the reaction.

Column 3: Major product of reaction.

The only correct combination in which the reaction intermediate is Carbene:

Discussion

41.	In the reaction, 8Al + 3Fe3O4→4Al2O3 + 9Fe, the number of electrons transferred from reductant to oxidant is:
Answer» In the reaction, $8 A l + 3 F e_{3} O_{4} \to 4 A l_{2} O_{3} + 9 F e$ , the number of electrons transferred from reductant to oxidant is:

Discussion

42.	All formulaes of ch 01
Answer» All formulaes of ch 01

Discussion

43.	How a free carbon makes a molecule reducing
Answer» How a free carbon makes a molecule reducing

Discussion

44.	CH3−O\|\|C−OHNH3−−−→ΔAP2O5−−−→ΔBProduct 'B' in the reaction is:
Answer» $C H_{3} - O \| \| C - O H N H_{3} - -- \to Δ A P_{2} O_{5} - -- \to Δ B$ Product 'B' in the reaction is:

Discussion

45.	In the following, the most stable conformation of n-butane is:
Answer» In the following, the most stable conformation of n-butane is:

Discussion

46.	What is meant by molarity
Answer» What is meant by molarity

Discussion

47.	What is iota
Answer» What is iota

Discussion

48.	The LPG is an odourless and colourless gas. To detect the leakage of LPG gas a chemical named _________ is added to it.
Answer» The LPG is an odourless and colourless gas. To detect the leakage of LPG gas a chemical named _________ is added to it.

Discussion

49.	The temperature at which the velocity of oxygen will be half that of hydrogen at NTP is
Answer» The temperature at which the velocity of oxygen will be half that of hydrogen at NTP is

Discussion

50.	At a constant temperature if1. volume is decreased by q % then the pressure should increased by r %2. Pressure is decreased by a % then the volume should increases by b %find relation between q and r and a and b
Answer» At a constant temperature if 1. volume is decreased by q % then the pressure should increased by r % 2. Pressure is decreased by a % then the volume should increases by b % find relation between q and r and a and b

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

For the estimation of nitrogen, 0.7 g of an organic compound was digested by Kjeldhal's method and the evolved ammonia was passed in 100 mL of 0.1 M sulphuric acid. The excess acid required 10 mL of 0.5 M Ba(OH)2 for complete neutralization. The percentage of nitrogen in the compound is:

A reactant (A) forms two products:Ak1−→B, Activation energy Ea1Ak2−→C, Activation energy Ea2If Ea2=2Ea1, then k1 and k2 are related as:

Can hexadentate Ligand act as a pentadentate or tetradentate?

61 What is self oxidation reduction reaction of aldehyde

Ifthe solubility product of CuS is 6 × 10−16,calculate the maximum molarity of CuS in aqueous solution.

How is silica glass prepared? Why is silica glass used to prepare laboratory glass-wares?

A compound of A and B crystallizes in a cubic lattice in which A atoms occupy the lattice points at the corners of the cube and two atoms of B occupy the center of each of the cube faces. What is the formula of this compound ?

pH of 0.1 M solution of NH_4CN solution is x. If its concentration is increased to 0.2 M then pH of the solution will be (1) 2x (2) x/2 (3) x (4) x/4

The amount of heat energy Q, used to heat up a substance depends on its mass m, its specific heat capacity (s) and change in temperature 'Delta T' of the substance. Using dimensional method find the expression for 's'??

Why is cooling produced when a liquid evaporates?

Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Choose the correct statement with respect to liquids or the liquid state:

Match the column:Column IColumn II(a) NH−2(p) μ=0(b) NH+4(q) Planar(c) I−3(r) dx2−y2 is involved in hybridization(d) PCl−6(s) dz2 is involved in hybridization(e) PCl+2(t) Bent structure

Which of the following element is isodiaphere of 23892U?

Why order of reactivity in borodine hunsdiecker rea tion is 1^°>2^°>3^° Which is opposite to order shown in nost of other rections

The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

lesser the value of ionisation enthalpy,greater the tendency of atom to form cation.why is this so?

An ethanolic solution of naphthalene contains0.25 mole fraction of solute. Molality of solution is(1) 5.92 m(2) 3.39 m(3) 7.25 m(4) 9.47 m

4.Oxidation number of phosphorus in H3po4

The structure of NaCI crystal is(1) Body centred cubic lattice(2) Face centred cubic lattice(3) Octahedral(4) Simple cubic lattice

In the oxygen dissociation curve featuring %saturation of Hb. and PO2, why is the PO2 40 mm Hg when %saturation is 75%?

Find dE/dy where E=1/4pie0×2qy/(a^2+y^2)^3/2

Light of wavelength λ falls on metal having work function hcλ0. Photoelectric effect will take place only if:

71 Steric inhibition of resonance can affect dipole moment of an organic compound.Explain how this happens?

For the reaction CO(g)+(1/2)O2(g)⇌CO2(g),Kp/Kc is

Benzyl phenyl ether (PhCH2­OPh) on cleavage with HI gives:

Which of the following oxides of chromium is amphoteric in nature

For the plot of ln k versus 1/T of Arrhenius equation, the slope and y-intercept are respectively.

The number of elements that do not have completely filled d subshell among the elements Ni,Pd,Pt,Cu,Ag,Au,Zn,Cd and Hg are

NH4Cl crystallizes in a body centred cubic lattice , with a unit cell distance of 387 pm. Calculate the radius of the NH+4 ion if the radius of the Cl− ion is 181 pm.

A particle is moving in a circular path with uniform speed. Is its kinetic energy same at all points?

What does zero order reaction mean?

If Z = 3, what would be the valency of the element? Also, name the element.​

The heat of combustion of CH_4(g), C(s) and H_2(g) at 25^{0 }C are -212.4 Kcal, -94.0 Kcal and -68.4 Kcal respectively, the heat of formation of CH_4 will be (1) +54.4 Kcal (2) -18.4 Kcal (3) -375.2 Kcal (4) +212.8 Kcal

(9 mL\) of mixture of methane and ethylene when exploded with 30ml (excess) of Oxygen. After Cooling the volume was 21.0ml. Further treatment with caustic potash reduced the volume to 7ml. The amounts of methane and ethylene is the mixture respectively are

The enthalpy of atomisation of CH4 and C2H6 are 360 and 620 k cal mol−1 respectively. The C - C bond energy is expected to be ?

Column 1: Name and formula of compound ColumnColumn 2: Name of the reaction.Column 3: Major product of reaction.The only correct combination in which the reaction intermediate is Carbene:

In the reaction, 8Al + 3Fe3O4→4Al2O3 + 9Fe, the number of electrons transferred from reductant to oxidant is:

All formulaes of ch 01

How a free carbon makes a molecule reducing

CH3−O||C−OHNH3−−−→ΔAP2O5−−−→ΔBProduct 'B' in the reaction is:

In the following, the most stable conformation of n-butane is:

What is meant by molarity

What is iota

The LPG is an odourless and colourless gas. To detect the leakage of LPG gas a chemical named _________ is added to it.

The temperature at which the velocity of oxygen will be half that of hydrogen at NTP is

At a constant temperature if1. volume is decreased by q % then the pressure should increased by r %2. Pressure is decreased by a % then the volume should increases by b %find relation between q and r and a and b

Benzyl phenyl ether (PhCH2OPh) on cleavage with HI gives:

If Z = 3, what would be the valency of the element? Also, name the element.