5083 + Interview Questions in Chemistry Page 11 InterviewSolution

501.	Major difference between Water molecule and water compoundAtom and element??
Answer» Major difference between Water molecule and water compound Atom and element??

Discussion

502.	Define water cycle. Rearrange the steps of a water cycle to get the correct sequence. [3 MARKS]i. Water evaporates from the water reservoirs present on land.ii. Water exists in the form of water vapours in the atmosphere.iii. Condensation of the water droplets converts them into clouds.iv. Rainwater again flows into different forms of water reservoirs on land.v. When the clouds become big and heavy they fall down as rain.vi. Water vapours, due to cooling, form droplets using dust particles as nuclei.
Answer» Define water cycle. Rearrange the steps of a water cycle to get the correct sequence. [3 MARKS] i. Water evaporates from the water reservoirs present on land. ii. Water exists in the form of water vapours in the atmosphere. iii. Condensation of the water droplets converts them into clouds. iv. Rainwater again flows into different forms of water reservoirs on land. v. When the clouds become big and heavy they fall down as rain. vi. Water vapours, due to cooling, form droplets using dust particles as nuclei.

Discussion

503.	At 298 K, the limiting molar conductivity of a weak monobasic acid is 4×102S cm2 mol−1. At 298 K, for an aqueous solution of the acid the degree of dissociation is α and the molar conductivity is y×102S cm2 mol−1 . At 298 K, upon 20 times dilution with water, the molar conductivity of the solution becomes 3y×102S cm2 mol−1.The value of α is .
Answer» At $298 K$ , the limiting molar conductivity of a weak monobasic acid is $4 \times 10^{2} S c m^{2} m o l^{- 1}$ . At $298 K$ , for an aqueous solution of the acid the degree of dissociation is $α$ and the molar conductivity is $y \times 10^{2} S c m^{2} m o l^{- 1}$ . At $298 K$ , upon $20$ times dilution with water, the molar conductivity of the solution becomes $3 y \times 10^{2} S c m^{2} m o l^{- 1}$ . The value of $α$ is .

Discussion

504.	Question 37Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?
Answer» Question 37 Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

Discussion

505.	Question 2How does the water kept in an earthen pot (matka) become cool during summer?
Answer» Question 2 How does the water kept in an earthen pot (matka) become cool during summer?

Discussion

506.	Question 07.A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish - orange. Which of the following would change the colour of this pH paper to greenish-blue ?(a) Lemon juice(b) Vinegar(c) Common salt(d) An antacid
Answer» Question 07. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish - orange. Which of the following would change the colour of this pH paper to greenish-blue ? (a) Lemon juice (b) Vinegar (c) Common salt (d) An antacid

Discussion

507.	Explain limiting reagent.
Answer» Explain limiting reagent.

Discussion

508.	(1)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(a) Do you think rust is different from iron?(2)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(b) Can you change rust back into iron by some simple method?(3)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(c) Do you think formation of rust from iron is a chemical change?(4)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(d) Give two other examples of a similar type of change.
Answer» (1) If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. (a) Do you think rust is different from iron? (2) If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. (b) Can you change rust back into iron by some simple method? (3) If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. (c) Do you think formation of rust from iron is a chemical change? (4) If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. (d) Give two other examples of a similar type of change.

508.

(1)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(a) Do you think rust is different from iron?(2)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(b) Can you change rust back into iron by some simple method?(3)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(c) Do you think formation of rust from iron is a chemical change?(4)If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.(d) Give two other examples of a similar type of change.

Answer» (1)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(2)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(b) Can you change rust back into iron by some simple method?

(3)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(c) Do you think formation of rust from iron is a chemical change?

(4)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two other examples of a similar type of change.

Discussion

509.	During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 to 1.139 g mL−1. Sulphuric acid of density 1.294 g mL−1 is 39 % H2SO4 by mass and that of density 1.139 g mL−1 is 20 % H2SO4 by mass. The battery holds 3.5 L of the acid and the volume remained practically constant during the discharge. The charging and discharging reactions arePb+SO2−4→PbSO4+2e− (charging)PbO2+4H++SO2−4+2e−→PbSO4+2H2O (discharging)The number of ampere-hour for which the battery must have been used is
Answer» During the discharge of a lead storage battery, the density of sulphuric acid fell from $1.294$ to $1.139 {g mL}^{- 1}$ . Sulphuric acid of density $1.294 {g mL}^{- 1}$ is $39 % H_{2} S O_{4}$ by mass and that of density $1.139 {g mL}^{- 1}$ is $20 % H_{2} S O_{4}$ by mass. The battery holds $3.5 L$ of the acid and the volume remained practically constant during the discharge. The charging and discharging reactions are $P b + S O_{4}^{2 -} \to P b S O_{4} + 2 e^{-}$ (charging) $P b O_{2} + 4 H^{+} + S O_{4}^{2 -} + 2 e^{-} \to P b S O_{4} + 2 H_{2} O$ (discharging) The number of ampere-hour for which the battery must have been used is

Discussion

510.	Incorrect graph for first order reaction is (R0 and R respectively represents the initial concentration and the concentration after time t)प्रथम कोटि अभिक्रिया के लिए गलत ग्राफ है (R0 तथा R क्रमशः प्रारम्भिक सांद्रता तथा समय t बाद सांद्रता को प्रदर्शित करते हैं)
Answer» Incorrect graph for first order reaction is (R₀ and R respectively represents the initial concentration and the concentration after time t) प्रथम कोटि अभिक्रिया के लिए गलत ग्राफ है (R₀ तथा R क्रमशः प्रारम्भिक सांद्रता तथा समय t बाद सांद्रता को प्रदर्शित करते हैं)

Discussion

511.	Rainwater percolates through the soil. Where does this water collect? What is the level of this water known as?
Answer» Rainwater percolates through the soil. Where does this water collect? What is the level of this water known as?

Discussion

512.	What is the relation between gram atoms and gram molecules with moles of a substance?
Answer» What is the relation between gram atoms and gram molecules with moles of a substance?

Discussion

513.	Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?
Answer» Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?

Discussion

514.	Can rising of iron take place with distilled water
Answer» Can rising of iron take place with distilled water

Discussion

515.	What is a reversible change? Give an example.
Answer» What is a reversible change? Give an example.

Discussion

516.	Dry ice is
Answer» Dry ice is

Discussion

517.	A first order reaction takes 20 minutes for 25% decomposition.calculate the time when 75% of the reaction will be completed.
Answer» A first order reaction takes 20 minutes for 25% decomposition.calculate the time when 75% of the reaction will be completed.

Discussion

518.	The atomicity of Na is 1. What does it mean?
Answer» The atomicity of Na is 1. What does it mean?

Discussion

519.	Explin why gases expand more than solids or liquids
Answer» Explin why gases expand more than solids or liquids

Discussion

520.	Salt,sugar,chalk and sand are all...................... A.elements B.compounds C.mixtures D.solution
Answer» Salt,sugar,chalk and sand are all...................... A.elements B.compounds C.mixtures D.solution

520.

Salt,sugar,chalk and sand are all...................... A.elements B.compounds C.mixtures D.solution

Answer»

Salt,sugar,chalk and sand are all......................

A.elements

B.compounds

C.mixtures

D.solution

Discussion

521.	Why does an immersion rod gets white deposits after heating it
Answer» Why does an immersion rod gets white deposits after heating it

Discussion

522.	The earth has an average temperature of 33 degree celcius 33°C which makes life possible on earth. This is due to:
Answer» The earth has an average temperature of 33 degree celcius 33°C which makes life possible on earth. This is due to:

Discussion

523.	What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide (FeS)?
Answer» What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide $(F e S)$ ?

Discussion

524.	How to identify the colour of any precipitate formed in Double Displacement reaction?
Answer» How to identify the colour of any precipitate formed in Double Displacement reaction?

Discussion

525.	How Avogadro number is applicable for any atom/molecule?
Answer» How Avogadro number is applicable for any atom/molecule?

Discussion

526.	Define saturated solution and also explain how saturated solution is made unsaturated.
Answer» Define saturated solution and also explain how saturated solution is made unsaturated.

Discussion

527.	Question 1 (a) What are the uses of common salt?(b) What is rock salt? Give examples.
Answer» Question 1 (a) What are the uses of common salt? (b) What is rock salt? Give examples.

527.

Question 1 (a) What are the uses of common salt?(b) What is rock salt? Give examples.

Answer»

Question 1

(a) What are the uses of common salt?

(b) What is rock salt? Give examples.

Discussion

528.	Naturally occurring unrefined oil is known as ______.
Answer» Naturally occurring unrefined oil is known as ______.

Discussion

529.	How to prevent rusting? [3 MARKS]
Answer» How to prevent rusting? [3 MARKS]

Discussion

530.	14. Which is more stable in Sn +2 or Sn +4 ? Explain how to identify which is more stable .
Answer» 14. Which is more stable in Sn +2 or Sn +4 ? Explain how to identify which is more stable .

Discussion

531.	Give three examples of acids and bases. [3 MARKS]
Answer» Give three examples of acids and bases. [3 MARKS]

Discussion

532.	What kinds of things are needed for climbing mountains?
Answer» What kinds of things are needed for climbing mountains?

Discussion

533.	Ram prepared some tasty food and was smelling delicious, but after 2 days he found some foul smell from that tasty food, he is amazed how can that happen. Help Ram with this with the help of an explanation that why spoiled food produces foul smell? [3 MARKS]
Answer» Ram prepared some tasty food and was smelling delicious, but after 2 days he found some foul smell from that tasty food, he is amazed how can that happen. Help Ram with this with the help of an explanation that why spoiled food produces foul smell? [3 MARKS]

Discussion

534.	2 apples & 3 bananas cost Rs.15 and 2 apples & 2 bananas cost Rs 12. What is the cost of an apple & a banana?
Answer» 2 apples & 3 bananas cost Rs.15 and 2 apples & 2 bananas cost Rs 12. What is the cost of an apple & a banana?

Discussion

535.	What are the conclusions of Rutherford's scattering experiment?
Answer» What are the conclusions of Rutherford's scattering experiment?

Discussion

536.	Question 1Which of the following correctly represent the electronic distribution in the Mg atom? (a) 3, 8, 1(b) 2, 8, 2(c) 1, 8, 3(d) 8, 2, 2
Answer» Question 1 Which of the following correctly represent the electronic distribution in the Mg atom? (a) 3, 8, 1 (b) 2, 8, 2 (c) 1, 8, 3 (d) 8, 2, 2

Discussion

537.	Which bacteria absorb atmospheric nitrogen and converts it into nitrate?
Answer» Which bacteria absorb atmospheric nitrogen and converts it into nitrate?

Discussion

538.	Classify the following into physical and chemical change. [2 MARKS]
Answer» Classify the following into physical and chemical change. [2 MARKS]

Discussion

539.	If 7/8 of radioactive substance disintegrate in 12 days. Its half Ilfe period
Answer» If 7/8 of radioactive substance disintegrate in 12 days. Its half Ilfe period

Discussion

540.	What are the effects of global warming on water cycle?
Answer» What are the effects of global warming on water cycle?

Discussion

541.	The rate of increase in human population and the rate of species extinction are ________ .
Answer» The rate of increase in human population and the rate of species extinction are ________ .

Discussion

542.	Among which of the following are the medicinal plants?
Answer» Among which of the following are the medicinal plants?

Discussion

543.	Give reason for the following observations.Naphthalene balls disappear with time without leaving any solid.
Answer» Give reason for the following observations. Naphthalene balls disappear with time without leaving any solid.

Discussion

544.	Write the balanced equation for photosynthesis.
Answer» Write the balanced equation for photosynthesis.

Discussion

545.	The scientist who discovered rayon fibre
Answer» The scientist who discovered rayon fibre

Discussion

546.	List - IList - II(I) Dissociation of N2O4(g):(P) Increases withN2O4(g)⇌2NO2(g);temperatureΔH=+57.0 kJ(II) Oxidation of NH3(g):(Q) Decreases with4NH3(g)+5O2⇌4NO(g)+6H2O(g);pressureΔH=−900.0 kJ(III) Oxidation of nitrogen:(R) Increases withN2(g)+O2(g)⇌2NO(g);addition of inertΔH=+180.0 kJgas at constantpressure(IV) Formation of NO2(g):(S) Decreases withNO(g)+O3(g)⇌NO2(g)+O2(g);temperatureΔH=−200.0 kJ(T) Kp=Kc(U) Kp=Kc(RT)1Which of the following options has the correct combination considering List-I and List-II?
Answer» $\begin{matrix} List - I & List - II (I) Dissociation of N_{2} O_{4} (g) : & (P) Increases with N_{2} O_{4} (g) ⇌ 2 N O_{2} (g); & temperature Δ H = + 57.0 k J (II) Oxidation of N H_{3} (g) : & (Q) Decreases with 4 N H_{3} (g) + 5 O_{2} ⇌ 4 N O (g) + 6 H_{2} O (g); & pressure Δ H = - 900.0 k J (III) Oxidation of nitrogen: & (R) Increases with N_{2} (g) + O_{2} (g) ⇌ 2 N O (g); & addition of inert Δ H = + 180.0 k J & gas at constant pressure (IV) Formation of N O_{2} (g) : & (S) Decreases with N O (g) + O_{3} (g) ⇌ N O_{2} (g) + O_{2} (g); & temperature Δ H = - 200.0 k J (T) K_{p} = K_{c} (U) K_{p} = K_{c} (R T)^{1} \end{matrix}$ Which of the following options has the correct combination considering List-I and List-II?

Discussion

547.	Match the following: (i)Can have variable composition of constituent elements(A)Compound(ii) – – – is new substance formed due to reaction of two constituent elements(B)Mixture(iii)Constituent elements can be separated easily(C)Element(iv)Can be separated only by chemical or electrochemical reactions(v)Composition is always fixed(vi)Shows properties of constituent elements The correct pairs are:-
Answer» Match the following: $\begin{matrix} (i) & Can have variable composition of constituent elements & (A) & Compound (ii) & - - - is new substance formed due to reaction of two constituent elements & (B) & Mixture (iii) & Constituent elements can be separated easily & (C) & Element (iv) & Can be separated only by chemical or electrochemical reactions (v) & Composition is always fixed (vi) & Shows properties of constituent elements \end{matrix}$ The correct pairs are:-

547.

Match the following: (i)Can have variable composition of constituent elements(A)Compound(ii) – – – is new substance formed due to reaction of two constituent elements(B)Mixture(iii)Constituent elements can be separated easily(C)Element(iv)Can be separated only by chemical or electrochemical reactions(v)Composition is always fixed(vi)Shows properties of constituent elements The correct pairs are:-

Answer»

Match the following:

$\begin{matrix} (i) & Can have variable composition of constituent elements & (A) & Compound (ii) & - - - is new substance formed due to reaction of two constituent elements & (B) & Mixture (iii) & Constituent elements can be separated easily & (C) & Element (iv) & Can be separated only by chemical or electrochemical reactions (v) & Composition is always fixed (vi) & Shows properties of constituent elements \end{matrix}$
The correct pairs are:-

Discussion

548.	What is periodic abstenence.Explain
Answer» What is periodic abstenence.Explain

Discussion

549.	69 If the concentration of the reactant is doubled the rate changes to four times whereas if the concentration of the reactant is thriced , the rate changes to nine times .What is the order of the reaction.
Answer» 69 If the concentration of the reactant is doubled the rate changes to four times whereas if the concentration of the reactant is thriced , the rate changes to nine times .What is the order of the reaction.

Discussion

550.	A pond of water at zero degree celsius is covered with layer of ice 4 cm thick if air temperature is -10 degree Celsius how how long it takes for ice thickness to increase to 8 cm k = 2 W/m°C,l_f= 80 cal/ gm, density of ice = 900 kg/ m^3
Answer» A pond of water at zero degree celsius is covered with layer of ice 4 cm thick if air temperature is -10 degree Celsius how how long it takes for ice thickness to increase to 8 cm k = 2 W/m°C, l_f= 80 cal/ gm, density of ice = 900 kg/ m^3

Discussion

Explore topic-wise InterviewSolutions in .

Major difference between Water molecule and water compoundAtom and element??

Question 37Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

Question 2How does the water kept in an earthen pot (matka) become cool during summer?

Question 07.A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish - orange. Which of the following would change the colour of this pH paper to greenish-blue ?(a) Lemon juice(b) Vinegar(c) Common salt(d) An antacid

Explain limiting reagent.

Rainwater percolates through the soil. Where does this water collect? What is the level of this water known as?

What is the relation between gram atoms and gram molecules with moles of a substance?

Name two substances that have different colours in acidic and basic solutions. What is the general name for such substances?

Can rising of iron take place with distilled water

What is a reversible change? Give an example.

Dry ice is

A first order reaction takes 20 minutes for 25% decomposition.calculate the time when 75% of the reaction will be completed.

The atomicity of Na is 1. What does it mean?

Explin why gases expand more than solids or liquids

Salt,sugar,chalk and sand are all...................... A.elements B.compounds C.mixtures D.solution

Why does an immersion rod gets white deposits after heating it

The earth has an average temperature of 33 degree celcius 33°C which makes life possible on earth. This is due to:

What is the mass of sulphur that would react with 5 g of iron to form ferrous sulphide (FeS)?

How to identify the colour of any precipitate formed in Double Displacement reaction?

How Avogadro number is applicable for any atom/molecule?

Define saturated solution and also explain how saturated solution is made unsaturated.

Question 1 (a) What are the uses of common salt?(b) What is rock salt? Give examples.

Naturally occurring unrefined oil is known as ______.

How to prevent rusting? [3 MARKS]

14. Which is more stable in Sn +2 or Sn +4 ? Explain how to identify which is more stable .

Give three examples of acids and bases. [3 MARKS]

What kinds of things are needed for climbing mountains?

Ram prepared some tasty food and was smelling delicious, but after 2 days he found some foul smell from that tasty food, he is amazed how can that happen. Help Ram with this with the help of an explanation that why spoiled food produces foul smell? [3 MARKS]

2 apples &amp; 3 bananas cost Rs.15 and 2 apples &amp; 2 bananas cost Rs 12. What is the cost of an apple &amp; a banana?

What are the conclusions of Rutherford's scattering experiment?

Question 1Which of the following correctly represent the electronic distribution in the Mg atom? (a) 3, 8, 1(b) 2, 8, 2(c) 1, 8, 3(d) 8, 2, 2

Which bacteria absorb atmospheric nitrogen and converts it into nitrate?

Classify the following into physical and chemical change. [2 MARKS]

If 7/8 of radioactive substance disintegrate in 12 days. Its half Ilfe period

What are the effects of global warming on water cycle?

The rate of increase in human population and the rate of species extinction are ________ .

Among which of the following are the medicinal plants?

Give reason for the following observations.Naphthalene balls disappear with time without leaving any solid.

Write the balanced equation for photosynthesis.

The scientist who discovered rayon fibre

What is periodic abstenence.Explain

69 If the concentration of the reactant is doubled the rate changes to four times whereas if the concentration of the reactant is thriced , the rate changes to nine times .What is the order of the reaction.

A pond of water at zero degree celsius is covered with layer of ice 4 cm thick if air temperature is -10 degree Celsius how how long it takes for ice thickness to increase to 8 cm k = 2 W/m°C,l_f= 80 cal/ gm, density of ice = 900 kg/ m^3

2 apples & 3 bananas cost Rs.15 and 2 apples & 2 bananas cost Rs 12. What is the cost of an apple & a banana?