46295 + Interview Questions in Chemistry

1.	Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature.
Answer» Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature.

1.

Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature.

Answer»

Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.

Reason: The reaction between nitrogen and oxygen requires high temperature.

Discussion

2.	A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is
Answer» A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

2.

A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

Answer»

A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

Discussion

3.	Each of the following options contains a set of few molecules, Identify the option(s) where all the molecules possess permanent dipole moment at room temperature.
Answer» Each of the following options contains a set of few molecules, Identify the option(s) where all the molecules possess permanent dipole moment at room temperature.

Discussion

4.	The intensive property among these quantities is
Answer» The intensive property among these quantities is

Discussion

5.	In the rusting of Iron, which of the following reaction occurs at cathode?
Answer» In the rusting of Iron, which of the following reaction occurs at cathode?

Discussion

6.	Which of the following has least boiling point?
Answer» Which of the following has least boiling point?

Discussion

7.	20 liter of tap water that hasCa(HCO3)2 was treated with 90 ml of M/50 HCl. The resulting solution requires an extra 6 ml of 0.1 M NaOH to make the solution neutral. What is the total hardness as parts of CaCO3 in ppm? (Take the molar mass of Ca(HCO3)2 = 162 g/mol)
Answer» 20 liter of tap water that has $C a (H C O_{3})_{2}$ was treated with 90 ml of M/50 HCl. The resulting solution requires an extra 6 ml of 0.1 M NaOH to make the solution neutral. What is the total hardness as parts of $C a C O_{3}$ in ppm? (Take the molar mass of $C a (H C O_{3})_{2}$ = 162 g/mol)

Discussion

8.	The pencil lead contains ___.
Answer» The pencil lead contains ___.

Discussion

9.	Reaction of ROH with R'MgX produce:
Answer» Reaction of ROH with R'MgX produce:

Discussion

10.	Which one of the following characteristics is associated with adsorption?
Answer» Which one of the following characteristics is associated with adsorption?

Discussion

11.	A first order reaction A→B requires activation energy of 80 kJ mol−1. When a 20% solution of A at 27 oC was kept for 20 min, 50% decomposition took place. What will be the degree of decomposition in the same time for a 30% solution at 47 ∘C? Take ln2=0.3, e2=7.4, e=2.8
Answer» A first order reaction $A \to B$ requires activation energy of $80 k J m o l^{- 1}$ . When a 20% solution of A at $27^{o} C$ was kept for 20 min, 50% decomposition took place. What will be the degree of decomposition in the same time for a 30% solution at $47^{\circ} C$ ? Take $l n 2 = 0.3, e^{2} = 7.4, e = 2.8$

Discussion

12.	Compound A (C5H10O) forms a phenyl hydrazone and gives a negative Tollen's test and negative iodoform test. On reducing A with Zn - Hg / HCl, n - pentane is formed. The compound A is
Answer» Compound A (C₅H₁₀O) forms a phenyl hydrazone and gives a negative Tollen's test and negative iodoform test. On reducing A with Zn - Hg / HCl, n - pentane is formed. The compound A is

Discussion

13.	Find the component statements of the following compound statements. 'The sky is blue and the grass is green'. Also, check whether statement is true or false.
Answer» Find the component statements of the following compound statements. 'The sky is blue and the grass is green'. Also, check whether statement is true or false.

13.

Find the component statements of the following compound statements. 'The sky is blue and the grass is green'. Also, check whether statement is true or false.

Answer»

Find the component statements of the following compound statements.

'The sky is blue and the grass is green'. Also, check whether statement is true or false.

Discussion

14.	Benzaldehyde reacts with X to produce cinnamaldehyde in Claisen condensation. X is :
Answer» Benzaldehyde reacts with X to produce cinnamaldehyde in Claisen condensation. X is :

Discussion

15.	Consider the four sulphates: FeSO4,MnSO4,CoSO4 and ZnSO4. Four separate capsules of these materials have been made containing 0.1 mole of the substance and are suspended by a thread. A strong magnet is brought close to each capsule. The order of sulphates according to the strength of the response towards the magnet is:
Answer» Consider the four sulphates: $F e S O_{4}, M n S O_{4}, C o S O_{4}$ and $Z n S O_{4}$ . Four separate capsules of these materials have been made containing $0.1$ mole of the substance and are suspended by a thread. A strong magnet is brought close to each capsule. The order of sulphates according to the strength of the response towards the magnet is:

Discussion

16.	Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure.
Answer» Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure.

16.

Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure.

Answer»

Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure.

Discussion

17.	Anhydrous potassium nitrate is heated with excess of metallic potassium KNO3(s)+K(s)→X+Y In this reaction , the products X and Y are
Answer» Anhydrous potassium nitrate is heated with excess of metallic potassium $K N O_{3} (s) + K (s) \to X + Y$ In this reaction , the products X and Y are

Discussion

18.	The depression in freezing point of a 0.1M solution of a solute that exists as a dimer is 'E'. The depression in freezing point of 0.1M NaCl solution in terms of 'E' is
Answer» The depression in freezing point of a 0.1M solution of a solute that exists as a dimer is 'E'. The depression in freezing point of 0.1M NaCl solution in terms of 'E' is

Discussion

19.	[IIT 1999]
Answer» [IIT 1999]

19.

[IIT 1999]

Answer»

[IIT 1999]

Discussion

20.	A violet colour with sodium nitroprusside in the test of sulphur in an organic compound is due to the formation of:
Answer» A violet colour with sodium nitroprusside in the test of sulphur in an organic compound is due to the formation of:

Discussion

21.	X+H2SO4→Y Y+K2Cr2O7+ H2SO4→ Green solution. Y is a colorless gas with irritating smell. X and Y are respectively:
Answer» $X + H_{2} S O_{4} \to Y$ $Y + K_{2} C r_{2} O_{7} +$ $H_{2} S O_{4} \to$ Green solution. $Y$ is a colorless gas with irritating smell. $X$ and $Y$ are respectively:

Discussion

22.	CH3−CH2−CH=CH−CHBr−CH=CH−CH2−CH3 When the mixture of all stereoisomers of the given compound is subjected to fractional distillation, in how many fractions they will get separated?
Answer» $C H_{3} - C H_{2} - C H = C H - C H B r - C H = C H - C H_{2} - C H_{3}$ When the mixture of all stereoisomers of the given compound is subjected to fractional distillation, in how many fractions they will get separated?

Discussion

23.	Positive charge in a one mole of Li+ ion is
Answer» Positive charge in a one mole of ${Li}^{+}$ ion is

Discussion

24.	The IUPAC name of the given compound is CH3−C\|CH3=CH−CHO
Answer» The IUPAC name of the given compound is $C H_{3} - C \| C H_{3} = C H - C H O$

24.

The IUPAC name of the given compound is CH3−C|CH3=CH−CHO

Answer»

The IUPAC name of the given compound is

$C H_{3} - C | C H_{3} = C H - C H O$

Discussion

25.	Arrange the following in the increasing order of their heat of hydrogenation:
Answer» Arrange the following in the increasing order of their heat of hydrogenation:

Discussion

26.	Which one has the highest boiling point ?
Answer» Which one has the highest boiling point ?

Discussion

27.	The ionization constant of HF, HCOOH and HCN at 298K are 6.8×10–4,1.8×10–4 and 4.8×10–9 respectively. Calculate the ionization constants of the corresponding conjugate base.
Answer» The ionization constant of HF, HCOOH and HCN at 298K are $6.8 \times 10^{- 4}, 1.8 \times 10^{- 4}$ and $4.8 \times 10^{- 9}$ respectively. Calculate the ionization constants of the corresponding conjugate base.

Discussion

28.	Why are vitamin A and vitamin C essential to us? Given their important sources.
Answer» Why are vitamin A and vitamin C essential to us? Given their important sources.

Discussion

29.	R−O\|\|C−Z+Nu−⟶R−O\|\|C−Nu+Z− The rate of the reaction is the fastest when ′Z′ is:
Answer» $R - O \| \| C - Z + N u^{-} ⟶ R - O \| \| C - N u + Z^{-}$ The rate of the reaction is the fastest when $^{'} Z^{'}$ is:

Discussion

30.	Addition of bromine on propene in presence of Brine yields a mixture of
Answer» Addition of bromine on propene in presence of Brine yields a mixture of

Discussion

31.	Peroxides of group IA metals are
Answer» Peroxides of group IA metals are

Discussion

32.	The element which exists as liquid upto 2000∘C& can be used in high temperature thermometry is
Answer» The element which exists as liquid upto $2000^{\circ} C &$ can be used in high temperature thermometry is

Discussion

33.	Ethyl chloride (C2H5Cl), is prepared by reaction of ethylene with hydrogen chloride : C2H4(g)+HCl(g)→C2H5Cl(g) ΔH=−72.3kJ. What is the value of ΔE (in KJ), if 70g of ethylene and 73g of HCl are allowed to react at 300K?
Answer» Ethyl chloride $(C_{2} H_{5} C l)$ , is prepared by reaction of ethylene with hydrogen chloride : $C_{2} H_{4} (g) + H C l (g) \to C_{2} H_{5} C l (g) Δ H = - 72.3 k J$ . What is the value of $Δ E$ (in KJ), if 70g of ethylene and 73g of $H C l$ are allowed to react at 300K?

33.

Ethyl chloride (C2H5Cl), is prepared by reaction of ethylene with hydrogen chloride : C2H4(g)+HCl(g)→C2H5Cl(g) ΔH=−72.3kJ. What is the value of ΔE (in KJ), if 70g of ethylene and 73g of HCl are allowed to react at 300K?

Answer»

Ethyl chloride $(C_{2} H_{5} C l)$ , is prepared by reaction of ethylene with hydrogen chloride :

$C_{2} H_{4} (g) + H C l (g) \to C_{2} H_{5} C l (g) Δ H = - 72.3 k J$ . What is the value of $Δ E$ (in KJ), if 70g of ethylene and 73g of $H C l$ are allowed to react at 300K?

Discussion

34.	Which among the following has highest melting point?
Answer» Which among the following has highest melting point?

Discussion

35.	Among the following the reaction that proceeds through an electrophilic substitution is
Answer» Among the following the reaction that proceeds through an electrophilic substitution is

Discussion

36.	Arrange the following compounds in the order of decreasing acidity
Answer» Arrange the following compounds in the order of decreasing acidity

Discussion

37.	Give the dehydration product(s) of:
Answer» Give the dehydration product(s) of:

Discussion

38.	What is the oxidation number of Fe in [Fe(H2O)5NO]SO4?
Answer» What is the oxidation number of Fe in $[F e (H_{2} O) 5 N O] S O_{4}$ ?

Discussion

39.	How does NBS reagent work?
Answer» How does NBS reagent work?

Discussion

40.	Which is more stable O2NCH2CH2O- or CH3CH2O- and why?
Answer» Which is more stable O2NCH2CH2O- or CH3CH2O- and why?

Discussion

41.	When two ethylanthraquinol dissolved in a mixture of benzene and cyclohexanol is oxidized the product is ?
Answer» When two ethylanthraquinol dissolved in a mixture of benzene and cyclohexanol is oxidized the product is ?

Discussion

42.	Zn extraction from Zn blade. - this reactionion is happened at 13000- 14000 c but the boiling point of Zn is 9200 c .... then how this possible ... explain ...
Answer» Zn extraction from Zn blade. - this reactionion is happened at 1300⁰- 1400⁰ c but the boiling point of Zn is 920⁰ c .... then how this possible ... explain ...

Discussion

43.	1 gm of solute is dissolved in 50 gm of benzene the depression in freezing point is 0.40 k the crioscopic constant is 5.12 find the molar mass of solute?
Answer» 1 gm of solute is dissolved in 50 gm of benzene the depression in freezing point is 0.40 k the crioscopic constant is 5.12 find the molar mass of solute?

Discussion

44.	Which of the following group of elements are known as inner transition elements?
Answer» Which of the following group of elements are known as inner transition elements?

Discussion

45.	The mass percentage of Fe+3 ion present in Fe0.93O1.0 is? 1)15%. 2) 5.5%. 3) 10%. 4) 11.5%
Answer» The mass percentage of ${F e}^{+ 3}$ ion present in $F e_{0.93} O_{1.0}$ is? 1)15%. 2) 5.5%. 3) 10%. 4) 11.5%

45.

The mass percentage of Fe+3 ion present in Fe0.93O1.0 is? 1)15%. 2) 5.5%. 3) 10%. 4) 11.5%

Answer»

The mass percentage of ${F e}^{+ 3}$ ion present in $F e_{0.93} O_{1.0}$ is?

1)15%.

2) 5.5%.

3) 10%.

4) 11.5%

Discussion

46.	In the following series of reactions NaCl + A → B + HCl, B + coke → Na2S + CO Na2S + C → Na2CO3 + CaSA, B and C are respectively
Answer» In the following series of reactions $N a C l + A \to B + H C l$ , $B + c o k e \to N a_{2} S + C O$ $N a_{2} S + C \to N a_{2} C O_{3} + C a S A$ , $B$ and $C$ are respectively

46.

In the following series of reactions NaCl + A → B + HCl, B + coke → Na2S + CO Na2S + C → Na2CO3 + CaSA, B and C are respectively

Answer»

In the following series of reactions

$N a C l + A \to B + H C l$ , $B + c o k e \to N a_{2} S + C O$

$N a_{2} S + C \to N a_{2} C O_{3} + C a S A$ , $B$ and $C$ are respectively

Discussion

47.	Identify the alcohol or phenol from the following which is most soluble in water.
Answer» Identify the alcohol or phenol from the following which is most soluble in water.

Discussion

48.	2 K4 [Fe (CN)6](aq) + H2O2 (aq) → 2 K3 [Fe (CN)6](aq) + 2KOH(aq) is an example of
Answer» 2 K₄ [Fe (CN)₆]_(aq) + H₂O_{2 (aq)} → 2 K₃ [Fe (CN)₆]_(aq) + 2KOH_(aq) is an example of

Discussion

49.	For two gases, A and B with molecular weights MA and MB, it is observed that at a centain temperature, T, the mean speed of A is equal to the root mean square speed of B. Thus the mean speed of A can be made equal to the mean speed of B, if
Answer» For two gases, A and B with molecular weights $M_{A} a n d M_{B}$ , it is observed that at a centain temperature, T, the mean speed of A is equal to the root mean square speed of B. Thus the mean speed of A can be made equal to the mean speed of B, if

Discussion

50.	Formation of two isomeric cyanides in the following reaction. CH3CH=CHCH2Cl+KCN(alc.) is due to
Answer» Formation of two isomeric cyanides in the following reaction. $C H_{3} C H = C H C H_{2} C l + K C N (a l c .)$ is due to

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature.

A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

Each of the following options contains a set of few molecules, Identify the option(s) where all the molecules possess permanent dipole moment at room temperature.

The intensive property among these quantities is

In the rusting of Iron, which of the following reaction occurs at cathode?

Which of the following has least boiling point?

20 liter of tap water that hasCa(HCO3)2 was treated with 90 ml of M/50 HCl. The resulting solution requires an extra 6 ml of 0.1 M NaOH to make the solution neutral. What is the total hardness as parts of CaCO3 in ppm? (Take the molar mass of Ca(HCO3)2 = 162 g/mol)

The pencil lead contains ___.

Reaction of ROH with R'MgX produce:

Which one of the following characteristics is associated with adsorption?

A first order reaction A→B requires activation energy of 80 kJ mol−1. When a 20% solution of A at 27 oC was kept for 20 min, 50% decomposition took place. What will be the degree of decomposition in the same time for a 30% solution at 47 ∘C? Take ln2=0.3, e2=7.4, e=2.8

Compound A (C5H10O) forms a phenyl hydrazone and gives a negative Tollen's test and negative iodoform test. On reducing A with Zn - Hg / HCl, n - pentane is formed. The compound A is

Find the component statements of the following compound statements. 'The sky is blue and the grass is green'. Also, check whether statement is true or false.

Benzaldehyde reacts with X to produce cinnamaldehyde in Claisen condensation. X is :

Explain the deviation in ionisation enthalpy of some elements from the general trend by using given figure.

Anhydrous potassium nitrate is heated with excess of metallic potassium KNO3(s)+K(s)→X+Y In this reaction , the products X and Y are

The depression in freezing point of a 0.1M solution of a solute that exists as a dimer is 'E'. The depression in freezing point of 0.1M NaCl solution in terms of 'E' is

[IIT 1999]

A violet colour with sodium nitroprusside in the test of sulphur in an organic compound is due to the formation of:

X+H2SO4→Y Y+K2Cr2O7+ H2SO4→ Green solution. Y is a colorless gas with irritating smell. X and Y are respectively:

CH3−CH2−CH=CH−CHBr−CH=CH−CH2−CH3 When the mixture of all stereoisomers of the given compound is subjected to fractional distillation, in how many fractions they will get separated?

Positive charge in a one mole of Li+ ion is

The IUPAC name of the given compound is CH3−C|CH3=CH−CHO

Arrange the following in the increasing order of their heat of hydrogenation:

Which one has the highest boiling point ?

The ionization constant of HF, HCOOH and HCN at 298K are 6.8×10–4,1.8×10–4 and 4.8×10–9 respectively. Calculate the ionization constants of the corresponding conjugate base.

Why are vitamin A and vitamin C essential to us? Given their important sources.

R−O||C−Z+Nu−⟶R−O||C−Nu+Z− The rate of the reaction is the fastest when ′Z′ is:

Addition of bromine on propene in presence of Brine yields a mixture of

Peroxides of group IA metals are

The element which exists as liquid upto 2000∘C&amp; can be used in high temperature thermometry is

Ethyl chloride (C2H5Cl), is prepared by reaction of ethylene with hydrogen chloride : C2H4(g)+HCl(g)→C2H5Cl(g) ΔH=−72.3kJ. What is the value of ΔE (in KJ), if 70g of ethylene and 73g of HCl are allowed to react at 300K?

Which among the following has highest melting point?

Among the following the reaction that proceeds through an electrophilic substitution is

Arrange the following compounds in the order of decreasing acidity

Give the dehydration product(s) of:

What is the oxidation number of Fe in [Fe(H2O)5NO]SO4?

How does NBS reagent work?

Which is more stable O2NCH2CH2O- or CH3CH2O- and why?

When two ethylanthraquinol dissolved in a mixture of benzene and cyclohexanol is oxidized the product is ?

Zn extraction from Zn blade. - this reactionion is happened at 13000- 14000 c but the boiling point of Zn is 9200 c .... then how this possible ... explain ...

1 gm of solute is dissolved in 50 gm of benzene the depression in freezing point is 0.40 k the crioscopic constant is 5.12 find the molar mass of solute?

Which of the following group of elements are known as inner transition elements?

The mass percentage of Fe+3 ion present in Fe0.93O1.0 is? 1)15%. 2) 5.5%. 3) 10%. 4) 11.5%

In the following series of reactions NaCl + A → B + HCl, B + coke → Na2S + CO Na2S + C → Na2CO3 + CaSA, B and C are respectively

Identify the alcohol or phenol from the following which is most soluble in water.

2 K4 [Fe (CN)6](aq) + H2O2 (aq) → 2 K3 [Fe (CN)6](aq) + 2KOH(aq) is an example of

For two gases, A and B with molecular weights MA and MB, it is observed that at a centain temperature, T, the mean speed of A is equal to the root mean square speed of B. Thus the mean speed of A can be made equal to the mean speed of B, if

Formation of two isomeric cyanides in the following reaction. CH3CH=CHCH2Cl+KCN(alc.) is due to

The element which exists as liquid upto 2000∘C& can be used in high temperature thermometry is