5083 + Interview Questions in Chemistry Page 30 InterviewSolution

1451.	Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.Reason (R): Copper is cheaper than graphite.Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).
Answer» Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires. Reason (R): Copper is cheaper than graphite. Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).

1451.

Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.Reason (R): Copper is cheaper than graphite.Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).

Answer»

Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.

Reason (R): Copper is cheaper than graphite.

Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).

Discussion

1452.	Range?
Answer» Range?

Discussion

1453.	Which of the following is a physical change?
Answer» Which of the following is a physical change?

Discussion

1454.	If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39
Answer» If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39

Discussion

1455.	For a first order reaction,the slope of the graph between lne([A]0[A])( on y−axis) and time (min) (on x−axis) is found out to be 0.5 min−1.The time at which 25% of the intial reactant is remaining is:Here,[A]0 is the initial concentration[A] is the concentration at time t
Answer» For a first order reaction,the slope of the graph between ${ln}_{e} (\frac{[A]_{0}}{[A]}) (o n y - a x i s)$ and $time (min) (o n x - a x i s)$ is found out to be $0.5 m i n^{- 1}$ . The time at which $25 %$ of the intial reactant is remaining is: Here, $[A]_{0}$ is the initial concentration $[A]$ is the concentration at time t

Discussion

1456.	For a reaction A + B→ C + D, if the concentrationof A is doubled without altering the concentration of B,the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of thereaction is:(a) 2(c) 3/2(b) 1(d) 4/3
Answer» For a reaction A + B→ C + D, if the concentrationof A is doubled without altering the concentration of B,the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of thereaction is:(a) 2(c) 3/2(b) 1(d) 4/3

Discussion

1457.	29. For a first order reaction t1/2 is 30 minutes at 300K and 15 minutes at T kelvin. T can be
Answer» 29. For a first order reaction t1/2 is 30 minutes at 300K and 15 minutes at T kelvin. T can be

Discussion

1458.	Explain why factory waste is neutrilized before disposing into water bodies.
Answer» Explain why factory waste is neutrilized before disposing into water bodies.

Discussion

1459.	how much charge per second is required to produce hydrogen gas at the rate of 1ml per second at STP by the electrolysis of aqueous NaCl
Answer» how much charge per second is required to produce hydrogen gas at the rate of 1ml per second at STP by the electrolysis of aqueous NaCl

Discussion

1460.	_____________ is the coal of superior quality.
Answer» _____________ is the coal of superior quality.

1460.

_____________ is the coal of superior quality.

Answer»

_____________ is the coal of superior quality.

Discussion

1461.	In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2×104 sec. The rate constant of the reaction in sec−1 is:
Answer» In a first order reaction the concentration of reactant decreases from $800 {mol/dm}^{3}$ to $50 {mol/dm}^{3}$ in $2 \times 10^{4} sec$ . The rate constant of the reaction in ${sec}^{- 1}$ is:

Discussion

1462.	When a bimetallic strip is heated, it
Answer» When a bimetallic strip is heated, it

Discussion

1463.	Is graphite poor conductor of electricity
Answer» Is graphite poor conductor of electricity

Discussion

1464.	How many litres of water has evaporatedon concentrating 10 litres of H2S04 such that its pH decreases from 6 to 5?
Answer» How many litres of water has evaporatedon concentrating 10 litres of H2S04 such that its pH decreases from 6 to 5?

Discussion

1465.	ntThe rate constant for 1st order reaction is 60 second inverse .How much time will it take to reduce the initial concentration of the reactant to its 1/16 th value?n
Answer» ntThe rate constant for 1st order reaction is 60 second inverse .How much time will it take to reduce the initial concentration of the reactant to its 1/16 th value?n

Discussion

1466.	Question 2Give an example of a double displacement reaction other than the one given in Activity 1.10.
Answer» Question 2 Give an example of a double displacement reaction other than the one given in Activity 1.10.

Discussion

1467.	Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively.1. Arrange the pH in increasing order of hydrogen-ion concentration.2. Which solution is(a) neutral?(b) strongly alkaline?(c) strongly acidic?(d) weakly acidic?(e) weakly alkaline?
Answer» Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. 1. Arrange the pH in increasing order of hydrogen-ion concentration. 2. Which solution is (a) neutral? (b) strongly alkaline? (c) strongly acidic? (d) weakly acidic? (e) weakly alkaline?

Discussion

1468.	Why loamy soil is fertile?
Answer» Why loamy soil is fertile?

Discussion

1469.	Explain the laboratory preparation of oxygen with hydrogen peroxide (H2O2) and manganese dioxide (MnO2).
Answer» Explain the laboratory preparation of oxygen with hydrogen peroxide (H₂O₂) and manganese dioxide (MnO₂).

Discussion

1470.	Which among the following is an example of an irreversible change?
Answer» Which among the following is an example of an irreversible change?

Discussion

1471.	Saving paper is a need of an hour? Give a reason.
Answer» Saving paper is a need of an hour? Give a reason.

Discussion

1472.

Some changes are listed in the following table. For each change, write in the blank column whether the change can be reversed or not. S. No. Change Can be reversed (Yes/No) 1. Sawing of a piece of wood - 2. Melting of ice candy - 3. Dissolving sugar in water - 4. Cooking food - 5. Ripening of a mango - 6. Souring of milk -

Answer»

Some
changes are listed in the following table. For each change, write in
the blank column whether the change can be reversed or not.

S. No.	Change	Can be reversed (Yes/No)
1.	Sawing of a piece of wood	-
2.	Melting of ice candy	-
3.	Dissolving sugar in water	-
4.	Cooking food	-
5.	Ripening of a mango	-
6.	Souring of milk	-

Discussion

1473.	The value of ΔG(kJ mol−1) for the given cell is (take 1 F=96500 C mol−1)
Answer» The value of $Δ G (k J {mol}^{- 1})$ for the given cell is (take $1 F = 96500 C {mol}^{- 1})$

Discussion

1474.	Select an appropriate verb for the blank. The tea cup _____ because it was made of glass.
Answer» Select an appropriate verb for the blank. The tea cup _____ because it was made of glass.

1474.

Select an appropriate verb for the blank. The tea cup _____ because it was made of glass.

Answer»

Select an appropriate verb for the blank.

The tea cup _____ because it was made of glass.

Discussion

1475.	Question 11What change will you observe if you test soap with litmus paper (red and blue)?
Answer» Question 11 What change will you observe if you test soap with litmus paper (red and blue)?

Discussion

1476.	Which of the following are correct with respect to chemical reactions? (i) Chemical compositon changes (ii) Formation of new products takes place (iii) We can’t obtain the intial reactants by simple physical means like filtering, dissolving etc.
Answer» Which of the following are correct with respect to chemical reactions? (i) Chemical compositon changes (ii) Formation of new products takes place (iii) We can’t obtain the intial reactants by simple physical means like filtering, dissolving etc.

Discussion

1477.	Which of the following is/are a type of coal?1. Anthracite 2. Bituminous 3. Sub-bituminous 4. Peat5. Lignite
Answer» Which of the following is/are a type of coal? 1. Anthracite 2. Bituminous 3. Sub-bituminous 4. Peat 5. Lignite

1477.

Which of the following is/are a type of coal?1. Anthracite 2. Bituminous 3. Sub-bituminous 4. Peat5. Lignite

Answer»

Which of the following is/are a type of coal?

1. Anthracite

2. Bituminous

3. Sub-bituminous

4. Peat

5. Lignite

Discussion

1478.	Question 16 Some words related with silk are jumbled up. Write them in their correct form (a)TURECULRISE (b) WILSMORK (c) BELMURRY (d) RINGLEE
Answer» Question 16 Some words related with silk are jumbled up. Write them in their correct form (a)TURECULRISE (b) WILSMORK (c) BELMURRY (d) RINGLEE

1478.

Question 16 Some words related with silk are jumbled up. Write them in their correct form (a)TURECULRISE (b) WILSMORK (c) BELMURRY (d) RINGLEE

Answer»

Question 16

Some words related with silk are jumbled up. Write them in their correct form
(a)TURECULRISE
(b) WILSMORK
(c) BELMURRY
(d) RINGLEE

Discussion

1479.	is all active electrode effect similarlly the product of electrolysis by lowering the discharge potential of cation?
Answer» is all active electrode effect similarlly the product of electrolysis by lowering the discharge potential of cation?

Discussion

1480.	Define filtration. State different types of filters that can be used. Which type of filter will you use to separate tea leaves while making tea?
Answer» Define filtration. State different types of filters that can be used. Which type of filter will you use to separate tea leaves while making tea?

Discussion

1481.	Is hydrogen bonding stronger than Van der Waals forces?
Answer» Is hydrogen bonding stronger than Van der Waals forces?

Discussion

1482.	What is meant by neutralization?
Answer» What is meant by neutralization?

Discussion

1483.	Which non-metal has semi conductor properties?
Answer» Which non-metal has semi conductor properties?

Discussion

1484.	Which of the following elements have completely filled L- shell?
Answer» Which of the following elements have completely filled L- shell?

Discussion

1485.	What is the effect on a glowing splinter when it is introduced to an oxygen jar?
Answer» What is the effect on a glowing splinter when it is introduced to an oxygen jar?

Discussion

1486.	in azeotropic mixture , what is the state of the solute and solvent(like are they solids or liquids
Answer» in azeotropic mixture , what is the state of the solute and solvent(like are they solids or liquids

Discussion

1487.	What is the percentage of nitrogen present in the earth’s atmosphere?
Answer» What is the percentage of nitrogen present in the earth’s atmosphere?

Discussion

1488.	The process of coating a layer of zinc over iron articles is known as __.
Answer» The process of coating a layer of zinc over iron articles is known as __.

Discussion

1489.	The decay leaves and animal droppings in a forest enrich the _______.
Answer» The decay leaves and animal droppings in a forest enrich the _______.

Discussion

1490.	What are indicators? How are they classified?
Answer» What are indicators? How are they classified?

Discussion

1491.	82.Reversible and irreversible processes
Answer» 82.Reversible and irreversible processes

Discussion

1492.	The rate of a reaction triples when temperature changes from 20oC to 50oC. Calculate energy of activation for the reaction (R=8.314 JK−1mol−1, log10 3=0.477).(Give your answer to the nearest integer value)
Answer» The rate of a reaction triples when temperature changes from $20^{o} C$ to $50^{o} C$ . Calculate energy of activation for the reaction $(R = 8.314 {JK}^{- 1} {mol}^{- 1}, l o g_{10} 3 = 0.477) .$ (Give your answer to the nearest integer value)

Discussion

1493.	if for cell ,deltaH of reaction is -285.8 kJ/mol.Enot of cell =1.23V.thermodynamic efficiency of fuel cell is (n=2)
Answer» if for cell ,deltaH of reaction is -285.8 kJ/mol.Enot of cell =1.23V.thermodynamic efficiency of fuel cell is (n=2)

Discussion

1494.	Air is not present in ___ .
Answer» Air is not present in ___ .

Discussion

1495.	The chemical formula of tear gas is:[0.77 Mark]
Answer» The chemical formula of tear gas is: [0.77 Mark]

Discussion

1496.	Which of the following metals melt when placed on the palm of your hand?
Answer» Which of the following metals melt when placed on the palm of your hand?

Discussion

1497.	Which method is best suited for the separation of a mixture of acetone and water?
Answer» Which method is best suited for the separation of a mixture of acetone and water?

Discussion

1498.	Is water on the earth a renewable or a non-renewable resource?
Answer» Is water on the earth a renewable or a non-renewable resource?

Discussion

1499.	Non-metallic character ..................... from left to right in a period. __
Answer» Non-metallic character ..................... from left to right in a period. __

Discussion

1500.

Consider the chemical reaction N2(g)+3H2(g)⟶2NH3(g) The rate of this reaction can be expressed in terms of time derivatives of the concentration of N2(g),H2(g),or NH3(g). Identify the correct relationship among the rate expressions.

Answer»

Consider the chemical reaction

$N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g)$

The rate of this reaction can be expressed in terms of time derivatives of the concentration of $N_{2} (g), H_{2} (g), o r N H_{3} (g) .$ Identify the correct relationship among the rate expressions.

Discussion

Explore topic-wise InterviewSolutions in .

Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.Reason (R): Copper is cheaper than graphite.Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).

Range?

Which of the following is a physical change?

If Li, Na, and an unknown element X, form a Döbereiner's triad, then the atomic mass of X is ______ amu. 39

For a first order reaction,the slope of the graph between lne([A]0[A])( on y−axis) and time (min) (on x−axis) is found out to be 0.5 min−1.The time at which 25% of the intial reactant is remaining is:Here,[A]0 is the initial concentration[A] is the concentration at time t

For a reaction A + B→ C + D, if the concentrationof A is doubled without altering the concentration of B,the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of thereaction is:(a) 2(c) 3/2(b) 1(d) 4/3

29. For a first order reaction t1/2 is 30 minutes at 300K and 15 minutes at T kelvin. T can be

Explain why factory waste is neutrilized before disposing into water bodies.

how much charge per second is required to produce hydrogen gas at the rate of 1ml per second at STP by the electrolysis of aqueous NaCl

_____________ is the coal of superior quality.

In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2×104 sec. The rate constant of the reaction in sec−1 is:

When a bimetallic strip is heated, it

Is graphite poor conductor of electricity

How many litres of water has evaporatedon concentrating 10 litres of H2S04 such that its pH decreases from 6 to 5?

ntThe rate constant for 1st order reaction is 60 second inverse .How much time will it take to reduce the initial concentration of the reactant to its 1/16 th value?n

Question 2Give an example of a double displacement reaction other than the one given in Activity 1.10.

Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively.1. Arrange the pH in increasing order of hydrogen-ion concentration.2. Which solution is(a) neutral?(b) strongly alkaline?(c) strongly acidic?(d) weakly acidic?(e) weakly alkaline?

Why loamy soil is fertile?

Explain the laboratory preparation of oxygen with hydrogen peroxide (H​​​​​​2​​​​​O​​​​2) and manganese dioxide (MnO​​​​2).

Which among the following is an example of an irreversible change?

Saving paper is a need of an hour? Give a reason.

The value of ΔG(kJ mol−1) for the given cell is (take 1 F=96500 C mol−1)

Select an appropriate verb for the blank. The tea cup _____ because it was made of glass.

Question 11What change will you observe if you test soap with litmus paper (red and blue)?

Which of the following are correct with respect to chemical reactions? (i) Chemical compositon changes (ii) Formation of new products takes place (iii) We can’t obtain the intial reactants by simple physical means like filtering, dissolving etc.

Which of the following is/are a type of coal?1. Anthracite 2. Bituminous 3. Sub-bituminous 4. Peat​5. Lignite

Question 16 Some words related with silk are jumbled up. Write them in their correct form (a)TURECULRISE (b) WILSMORK (c) BELMURRY (d) RINGLEE

is all active electrode effect similarlly the product of electrolysis by lowering the discharge potential of cation?

Define filtration. State different types of filters that can be used. Which type of filter will you use to separate tea leaves while making tea?

Is hydrogen bonding stronger than Van der Waals forces?

What is meant by neutralization?

Which non-metal has semi conductor properties?

Which of the following elements have completely filled L- shell?

What is the effect on a glowing splinter when it is introduced to an oxygen jar?

in azeotropic mixture , what is the state of the solute and solvent(like are they solids or liquids

What is the percentage of nitrogen present in the earth’s atmosphere?

The process of coating a layer of zinc over iron articles is known as __.

The decay leaves and animal droppings in a forest enrich the _______.

What are indicators? How are they classified?

82.Reversible and irreversible processes

The rate of a reaction triples when temperature changes from 20oC to 50oC. Calculate energy of activation for the reaction (R=8.314 JK−1mol−1, log10 3=0.477).(Give your answer to the nearest integer value)

if for cell ,deltaH of reaction is -285.8 kJ/mol.Enot of cell =1.23V.thermodynamic efficiency of fuel cell is (n=2)

Air is not present in ___ .

The chemical formula of tear gas is:[0.77 Mark]

Which of the following metals melt when placed on the palm of your hand?

Which method is best suited for the separation of a mixture of acetone and water?

Is water on the earth a renewable or a non-renewable resource?

Non-metallic character ..................... from left to right in a period. __

Consider the chemical reaction N2(g)+3H2(g)⟶2NH3(g) The rate of this reaction can be expressed in terms of time derivatives of the concentration of N2(g),H2(g),or NH3(g). Identify the correct relationship among the rate expressions.

Explain the laboratory preparation of oxygen with hydrogen peroxide (H2O2) and manganese dioxide (MnO2).

Which of the following is/are a type of coal?1. Anthracite 2. Bituminous 3. Sub-bituminous 4. Peat5. Lignite