46295 + Interview Questions in Chemistry

1.	In the following pair of compounds, ionic and covalent hydrides are, respectively:
Answer» In the following pair of compounds, ionic and covalent hydrides are, respectively:

Discussion

2.	If three positive real numbers abc are in AP such that abc=4 then the minimum value of b is
Answer» If three positive real numbers abc are in AP such that abc=4 then the minimum value of b is

Discussion

3.	The reactivity order of halogen acids with ethers is
Answer» The reactivity order of halogen acids with ethers is

Discussion

4.	The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to:
Answer» The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to:

Discussion

5.	What is half equation?
Answer» What is half equation?

Discussion

6.	In NaCl crystal each CL minus ion is surrounded by a) 4 Na+ ions B) 6 Na C) 1 Na D) 2 Na
Answer» In NaCl crystal each CL minus ion is surrounded by a) 4 Na+ ions B) 6 Na C) 1 Na D) 2 Na

6.

In NaCl crystal each CL minus ion is surrounded by a) 4 Na+ ions B) 6 Na C) 1 Na D) 2 Na

Answer»

In NaCl crystal each CL minus ion is surrounded by

a) 4 Na+ ions

B) 6 Na

C) 1 Na

D) 2 Na

Discussion

7.	When 0.1 mole solid NaOH is added in 1L of 0.1 M NH3(aq.) (Kb=2×10−5), then select the correct statement(s):
Answer» When 0.1 mole solid NaOH is added in 1L of 0.1 M $N H_{3}$ (aq.) $(K b = 2 \times 10^{- 5})$ , then select the correct statement(s):

Discussion

8.	In the Mendeleev's Periodic table, gaps were left for the elements that were expected to be discovered later.Which of the following elements found a place in the periodic table later?
Answer» In the Mendeleev's Periodic table, gaps were left for the elements that were expected to be discovered later.Which of the following elements found a place in the periodic table later?

Discussion

9.	Amides may be converted into amines by reaction named after [CPMT 1974; MP PET 1992; CBSE PMT 1999]
Answer» Amides may be converted into amines by reaction named after [CPMT 1974; MP PET 1992; CBSE PMT 1999]

9.

Amides may be converted into amines by reaction named after [CPMT 1974; MP PET 1992; CBSE PMT 1999]

Answer»

Amides may be converted into amines by reaction named after

[CPMT 1974; MP PET 1992; CBSE PMT 1999]

Discussion

10.	Chemical property of alkane conditons–––––––––––––––––––––––––––––––––––––––––– I. Pyrolysis a. HCl/anhydrous AlCl3 II. Isomerisation b. (CH3COO)2 Mn III. Aromatisation c. Pt / 973 K IV. C2H6→CH3COOH d. Cr2O5/500∘C,10−20 atm
Answer» $Chemical property of alkane conditons - ---------------------------------------- -$ I. Pyrolysis a. HCl/anhydrous $A l C l_{3}$ II. Isomerisation b. $(C H_{3} C O O)_{2}$ Mn III. Aromatisation c. Pt / 973 K IV. $C_{2} H_{6} \to C H_{3} C O O H$ d. $C r_{2} O_{5} / 500^{\circ} C, 10 - 20$ atm

10.

Chemical property of alkane conditons–––––––––––––––––––––––––––––––––––––––––– I. Pyrolysis a. HCl/anhydrous AlCl3 II. Isomerisation b. (CH3COO)2 Mn III. Aromatisation c. Pt / 973 K IV. C2H6→CH3COOH d. Cr2O5/500∘C,10−20 atm

Answer»

$Chemical property of alkane conditons - ---------------------------------------- -$

I. Pyrolysis a. HCl/anhydrous $A l C l_{3}$

II. Isomerisation b. $(C H_{3} C O O)_{2}$ Mn

III. Aromatisation c. Pt / 973 K

IV. $C_{2} H_{6} \to C H_{3} C O O H$ d. $C r_{2} O_{5} / 500^{\circ} C, 10 - 20$ atm

Discussion

11.	Calculate the number of atoms of each type in 5.3g of Na2 Co3 (at.mass of Na=23,C=12 & O =16)
Answer» Calculate the number of atoms of each type in 5.3g of Na2 Co3 (at.mass of Na=23,C=12 & O =16)

Discussion

12.	How will you distinguish between Ethane and Ethene Chemically ? Give Reaction Involved.
Answer» How will you distinguish between Ethane and Ethene Chemically ? Give Reaction Involved.

Discussion

13.	what is the property of water hyacinth by which it aborsbs oxygen because plant needs carbon dioxide as its respiratory product?
Answer» what is the property of water hyacinth by which it aborsbs oxygen because plant needs carbon dioxide as its respiratory product?

Discussion

14.	Explain why this reaction takes place in anti markownikoff regiochemistry. ? CF3CH=CH2+HCL give rise to CH3CH2CH2CL
Answer» Explain why this reaction takes place in anti markownikoff regiochemistry. ? CF3CH=CH2+HCL give rise to CH3CH2CH2CL

Discussion

15.	'x' moles of N2 gas at S.T.P conditions occupy a volume of 10 litres, then the volume of '2x' moles of CH4 at 2730 C and 1.5 atm is
Answer» 'x' moles of $N_{2}$ gas at S.T.P conditions occupy a volume of 10 litres, then the volume of '2x' moles of $C H_{4}$ at $273^{0} C$ and 1.5 atm is

Discussion

16.	Complete and balance the following chemical equations : (a) Fe2++MnO−4+H+⟶ (b) MnO−4+H2O+I−⟶
Answer» Complete and balance the following chemical equations : (a) $F e^{2 +} + M n O_{4}^{-} + H^{+} ⟶$ (b) $M n O_{4}^{-} + H_{2} O + I^{-} ⟶$

Discussion

17.	Out of NH3 and N2 which will have larger 'a' value and larger 'b' value ?
Answer» Out of NH3 and N2 which will have larger 'a' value and larger 'b' value ?

Discussion

18.	The number of spectral lines that are possible when electrons in the 7th shell in a sample of hydrogen atoms return to the 3rd shell is:
Answer» The number of spectral lines that are possible when electrons in the $7^{t h}$ shell in a sample of hydrogen atoms return to the $3^{r d}$ shell is:

Discussion

19.	Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, Ka, for this acid will be
Answer» Accumulation of lactic acid $(H C_{3} H_{5} O_{3}),$ a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, $K_{a},$ for this acid will be

Discussion

20.	Ph−C≡NH3O+−−−−−−−−−−→Partial Hydrolysis(A)Br2+KOH−−−−−→(B) Product (B) is:
Answer» $Ph - C \equiv N H_{3} O^{+} - --------- \to Partial Hydrolysis (A) {Br}_{2} + KOH - ---- \to (B)$ Product (B) is:

Discussion

21.	Whichf of the following is a network solid ? (a) SO2(solid) (b) I2 (c) Diamond (d) H2O (ice)
Answer» Whichf of the following is a network solid ? (a) $S O_{2}$ (solid) (b) $I_{2}$ (c) Diamond (d) $H_{2} O$ (ice)

21.

Whichf of the following is a network solid ? (a) SO2(solid) (b) I2 (c) Diamond (d) H2O (ice)

Answer»

Whichf of the following is a network solid ?

(a) $S O_{2}$ (solid) (b) $I_{2}$

(c) Diamond (d) $H_{2} O$ (ice)

Discussion

22.	The oxidation state of fluorine is 1 and that of chlorine is as high as:
Answer» The oxidation state of fluorine is 1 and that of chlorine is as high as:

Discussion

23.	What are pesticides and herbicides? Explain giving examples.
Answer» What are pesticides and herbicides? Explain giving examples.

Discussion

24.	Which of the following is an amphoteric hydroxide?
Answer» Which of the following is an amphoteric hydroxide?

Discussion

25.	250 ml of a sodium carbonate solution contains 2.65grams of Na2Co3. 10ml of this solution is added to x ml of water to obtain 0.001M Na2Co3 solution. What is the value of x in ml?
Answer» 250 ml of a sodium carbonate solution contains 2.65grams of Na2Co3. 10ml of this solution is added to x ml of water to obtain 0.001M Na2Co3 solution. What is the value of x in ml?

Discussion

26.	The entropy change for the conversion of the one gram of ice to water at 273 K and one atmospheric pressure [ΔHfusion=6.025kJmol−1] is:
Answer» The entropy change for the conversion of the one gram of ice to water at 273 K and one atmospheric pressure $[Δ H_{f u s i o n} = 6.025 k J m o l^{- 1}]$ is:

Discussion

27.	FeCr2O4+NaOH+air→(A)+Fe2O3 (A) + (B) → Na2Cr207 Na2Cr2O7 + XΔ−→ Cr2O3 Cr2O3 + YΔ−→ Cr Compound (A) and (B) are :
Answer» $F e C r_{2} O_{4} + N a O H + a i r \to (A) + F e_{2} O_{3}$ $(A) + (B) \to N a_{2} C r_{2} 07$ $N a_{2} C r_{2} O_{7} + X Δ - \to C r_{2} O_{3}$ $C r_{2} O_{3} + Y Δ - \to C r$ Compound (A) and (B) are :

Discussion

28.	Predict the product C obtained in the following reaction of CH3CH2−C≡CH+HCl→BHI−−→C
Answer» Predict the product C obtained in the following reaction of $C H_{3} C H_{2} - C \equiv C H + H C l \to B H I - - \to C$

28.

Predict the product C obtained in the following reaction of CH3CH2−C≡CH+HCl→BHI−−→C

Answer»

Predict the product C obtained in the following reaction of

$C H_{3} C H_{2} - C \equiv C H + H C l \to B H I - - \to C$

Discussion

29.	With which of the given pairs CO2 resembles
Answer» With which of the given pairs $C O_{2}$ resembles

Discussion

30.	Number of π electrons in cyclobutadienyl anion (C4H4)−2 is
Answer» Number of $^{π}$ electrons in cyclobutadienyl anion $(C_{4} H_{4})^{- 2}$ is

30.

Number of π electrons in cyclobutadienyl anion (C4H4)−2 is

Answer»

Number of $^{π}$ electrons in cyclobutadienyl anion $(C_{4} H_{4})^{- 2}$ is

Discussion

31.	Write four characteristic properties of P- block elements.
Answer» Write four characteristic properties of P- block elements.

Discussion

32.	In Samwell's classes, the Maesters made the following statements. He had to figure out how many were right. Can you help him? Maester 1 said: Rate constant is characteristic of a reaction Maester 2 said: Rate constant is dependent on temperature Maester 3 said: Rate constant is not dependent on the catalyst
Answer» In Samwell's classes, the Maesters made the following statements. He had to figure out how many were right. Can you help him? Maester 1 said: Rate constant is characteristic of a reaction Maester 2 said: Rate constant is dependent on temperature Maester 3 said: Rate constant is not dependent on the catalyst

Discussion

33.	Which of the following overall equations represents fermentation that occurs in yeast cells?
Answer» Which of the following overall equations represents fermentation that occurs in yeast cells?

Discussion

34.	The oxidation cleavage of 1,2-diol by a periodic acid or periodic salt to give corresponding carbonyls is known as Malaprade oxidation. Vicinal diols can also be oxidized to form aldehydes and ketones by lead tetraacetate. This oxidation cleavage is analogous to malaprade oxidation and is known as Criegee oxidation. When Halohydrin is treated with Ag2O or Silver salt, it gives pinacol-pinacolone type rearrangement called semi-pinacol rearrangement. List-I contains reactions and List-II contains products that can be formed. Which of the following options has the correct combination considering reaction in List-I and their product(s) in List-II?
Answer» The oxidation cleavage of 1,2-diol by a periodic acid or periodic salt to give corresponding carbonyls is known as Malaprade oxidation. Vicinal diols can also be oxidized to form aldehydes and ketones by lead tetraacetate. This oxidation cleavage is analogous to malaprade oxidation and is known as Criegee oxidation. When Halohydrin is treated with $A g_{2} O$ or Silver salt, it gives pinacol-pinacolone type rearrangement called semi-pinacol rearrangement. List-I contains reactions and List-II contains products that can be formed. Which of the following options has the correct combination considering reaction in List-I and their product(s) in List-II?

Discussion

35.	The standard reduction potentials at 298 K for the following half reactions are given, Zn2+(aq)+2e−⇌Zn(s) E∘= −0.762 V Cr3+(aq)+3e−⇌Cr(s) E∘= −0.740 V 2H+(aq)+2e−⇌H2(g) E∘= 0.000 V Fe3+(aq)+e−⇌Fe2+(s) E∘= 0.770 V Which is the strongest reducing agent?
Answer» The standard reduction potentials at 298 K for the following half reactions are given, $Z n_{(a q)}^{2 +} + 2 e^{-} ⇌ Z n_{(s)}$ $E^{\circ}$ = $- 0.762 V$ $C r_{(a q)}^{3 +} + 3 e^{-} ⇌ C r_{(s)}$ $E^{\circ}$ = $- 0.740 V$ $2 H_{(a q)}^{+} + 2 e^{-} ⇌ H_{2 (g)}$ $E^{\circ}$ = $0.000 V$ $F e_{(a q)}^{3 +} + e^{-} ⇌ F e_{(s)}^{2 +}$ $E^{\circ}$ = $0.770 V$ Which is the strongest reducing agent?

Discussion

36.	If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.2160C than that of the pure solvent, then the molecular weight of the substance is (molal elevation constant for the solvent is 2.16):
Answer» If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.216⁰C than that of the pure solvent, then the molecular weight of the substance is (molal elevation constant for the solvent is 2.16):

36.

If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.2160C than that of the pure solvent, then the molecular weight of the substance is (molal elevation constant for the solvent is 2.16):

Answer»

If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.216⁰C than that of the pure solvent, then the molecular weight of the

substance is (molal elevation constant for the solvent is 2.16):

Discussion

37.	Which of the following do not form hydrides?
Answer» Which of the following do not form hydrides?

Discussion

38.	[EDTA]4− is a
Answer» $[E D T A]^{4 -}$ is a

Discussion

39.	Chose the correct option where T1,T2 and T3 are three different temperatures in case of a liquid.
Answer» Chose the correct option where $T_{1}, T_{2} a n d T_{3}$ are three different temperatures in case of a liquid.

Discussion

40.	An aqueous solution of ammonium acetate is
Answer» An aqueous solution of ammonium acetate is

Discussion

41.	If 80% of a radioactive element undergoing decay is left over after a certain period of time t from the start, how many such periods should elapse from the start for the 50% of the element to be left over ?
Answer» If 80% of a radioactive element undergoing decay is left over after a certain period of time t from the start, how many such periods should elapse from the start for the 50% of the element to be left over ?

Discussion

42.	Which of the following is non-electrolyte
Answer» Which of the following is non-electrolyte

Discussion

43.	The addition of sodium acetate to 0.1 M acetic acid will cause
Answer» The addition of sodium acetate to 0.1 M acetic acid will cause

Discussion

44.	Which one is most reactive towards electrophilic reagent?
Answer» Which one is most reactive towards electrophilic reagent?

Discussion

45.	If the distance between Na+ and Cl− ions in an NaCl crystal is 'a' pm, what is the length of the cell edge?
Answer» If the distance between $N a^{+}$ and $C l^{-}$ ions in an NaCl crystal is 'a' pm, what is the length of the cell edge?

Discussion

46.	What is X in the following nuclear reaction 7N14+1H1→8O15+X
Answer» What is X in the following nuclear reaction $_{7} N^{14} +_{1} H^{1} \to_{8} O^{15} + X$

Discussion

47.	Reduction of nitroalkanes in neutral medium ( Zn/NH4Cl ) forms mainly
Answer» Reduction of nitroalkanes in neutral medium ( $Z n / N H_{4} C l$ ) forms mainly

Discussion

48.	Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.
Answer» Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.

Discussion

49.	In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices. (a) Assertion and reason both are true, reason is correct explanation of assertion. (b) Assertion and reason both are true but reason is not the correct explanation of assertion. (c) Assertion is true, reason is false. (d) Assertion is false, reason is true. Assertion (A) [Cr(H2O6)]Cl2 and [Fe(H2O)6]Cl2 are reducing in nature. Reason (R) Unpaired electrons are present in their d-orbitals.
Answer» In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. Choose the correct answer out of the following choices. (a) Assertion and reason both are true, reason is correct explanation of assertion. (b) Assertion and reason both are true but reason is not the correct explanation of assertion. (c) Assertion is true, reason is false. (d) Assertion is false, reason is true. Assertion (A) $[C r (H_{2} O_{6})] C l_{2}$ and $[F e (H_{2} O)_{6}] C l_{2}$ are reducing in nature. Reason (R) Unpaired electrons are present in their d-orbitals.

Discussion

50.	BX3NH3⟶BX3.NH3 ΔHf = Heat of formation of the adduct. The numerical value of ΔHf is found to be maximum for:
Answer» $B X_{3} N H_{3} ⟶ B X_{3} . N H_{3}$ $Δ H_{f}$ = Heat of formation of the adduct. The numerical value of $Δ H_{f}$ is found to be maximum for:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the following pair of compounds, ionic and covalent hydrides are, respectively:

If three positive real numbers abc are in AP such that abc=4 then the minimum value of b is

The reactivity order of halogen acids with ethers is

The unequal sharing of bonded pair of electrons between two atoms in a molecule gives rise to:

What is half equation?

In NaCl crystal each CL minus ion is surrounded by a) 4 Na+ ions B) 6 Na C) 1 Na D) 2 Na

When 0.1 mole solid NaOH is added in 1L of 0.1 M NH3(aq.) (Kb=2×10−5), then select the correct statement(s):

In the Mendeleev's Periodic table, gaps were left for the elements that were expected to be discovered later.Which of the following elements found a place in the periodic table later?

Amides may be converted into amines by reaction named after [CPMT 1974; MP PET 1992; CBSE PMT 1999]

Calculate the number of atoms of each type in 5.3g of Na2 Co3 (at.mass of Na=23,C=12 & O =16)

How will you distinguish between Ethane and Ethene Chemically ? Give Reaction Involved.

what is the property of water hyacinth by which it aborsbs oxygen because plant needs carbon dioxide as its respiratory product?

Explain why this reaction takes place in anti markownikoff regiochemistry. ? CF3CH=CH2+HCL give rise to CH3CH2CH2CL

'x' moles of N2 gas at S.T.P conditions occupy a volume of 10 litres, then the volume of '2x' moles of CH4 at 2730 C and 1.5 atm is

Complete and balance the following chemical equations : (a) Fe2++MnO−4+H+⟶ (b) MnO−4+H2O+I−⟶

Out of NH3 and N2 which will have larger 'a' value and larger 'b' value ?

The number of spectral lines that are possible when electrons in the 7th shell in a sample of hydrogen atoms return to the 3rd shell is:

Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, Ka, for this acid will be

Ph−C≡NH3O+−−−−−−−−−−→Partial Hydrolysis(A)Br2+KOH−−−−−→(B) Product (B) is:

Whichf of the following is a network solid ? (a) SO2(solid) (b) I2 (c) Diamond (d) H2O (ice)

The oxidation state of fluorine is 1 and that of chlorine is as high as:

What are pesticides and herbicides? Explain giving examples.

Which of the following is an amphoteric hydroxide?

250 ml of a sodium carbonate solution contains 2.65grams of Na2Co3. 10ml of this solution is added to x ml of water to obtain 0.001M Na2Co3 solution. What is the value of x in ml?

The entropy change for the conversion of the one gram of ice to water at 273 K and one atmospheric pressure [ΔHfusion=6.025kJmol−1] is:

FeCr2O4+NaOH+air→(A)+Fe2O3 (A) + (B) → Na2Cr207 Na2Cr2O7 + XΔ−→ Cr2O3 Cr2O3 + YΔ−→ Cr Compound (A) and (B) are :

Predict the product C obtained in the following reaction of CH3CH2−C≡CH+HCl→BHI−−→C

With which of the given pairs CO2 resembles

Number of π electrons in cyclobutadienyl anion (C4H4)−2 is

Write four characteristic properties of P- block elements.

Which of the following overall equations represents fermentation that occurs in yeast cells?

The standard reduction potentials at 298 K for the following half reactions are given, Zn2+(aq)+2e−⇌Zn(s) E∘= −0.762 V Cr3+(aq)+3e−⇌Cr(s) E∘= −0.740 V 2H+(aq)+2e−⇌H2(g) E∘= 0.000 V Fe3+(aq)+e−⇌Fe2+(s) E∘= 0.770 V Which is the strongest reducing agent?

If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.2160C than that of the pure solvent, then the molecular weight of the substance is (molal elevation constant for the solvent is 2.16):

Which of the following do not form hydrides?

[EDTA]4− is a

Chose the correct option where T1,T2 and T3 are three different temperatures in case of a liquid.

An aqueous solution of ammonium acetate is

If 80% of a radioactive element undergoing decay is left over after a certain period of time t from the start, how many such periods should elapse from the start for the 50% of the element to be left over ?

Which of the following is non-electrolyte

The addition of sodium acetate to 0.1 M acetic acid will cause

Which one is most reactive towards electrophilic reagent?

If the distance between Na+ and Cl− ions in an NaCl crystal is 'a' pm, what is the length of the cell edge?

What is X in the following nuclear reaction 7N14+1H1→8O15+X

Reduction of nitroalkanes in neutral medium ( Zn/NH4Cl ) forms mainly

BX3NH3⟶BX3.NH3 ΔHf = Heat of formation of the adduct. The numerical value of ΔHf is found to be maximum for: