5083 + Interview Questions in Chemistry Page 21 InterviewSolution

1001.	72.Calcium carbide + water = ? Is carbon dioxide is released in the teaction ?give reason why /why not?
Answer» 72.Calcium carbide + water = ? Is carbon dioxide is released in the teaction ?give reason why /why not?

Discussion

1002.	How are the types of underground stem differs from each other?
Answer» How are the types of underground stem differs from each other?

Discussion

1003.	Shear stress is ___
Answer» Shear stress is ___

Discussion

1004.	Vant hoff factor of HgCl2 in its aqueous solution will be (HgCl2 is 80% ionized in the solution)
Answer» Vant hoff factor of HgCl2 in its aqueous solution will be (HgCl2 is 80% ionized in the solution)

Discussion

1005.	Increase in the average temperature of Earth's atmosphere is called ___ .
Answer» Increase in the average temperature of Earth's atmosphere is called ___ .

Discussion

1006.	Why ice is solid
Answer» Why ice is solid

Discussion

1007.	What is a cocoon?
Answer» What is a cocoon?

Discussion

1008.	What are the different types of elements? Explain each with examples.
Answer» What are the different types of elements? Explain each with examples.

Discussion

1009.	What exactly is topical fluoride?
Answer» What exactly is topical fluoride?

Discussion

1010.	Explain AM & GM calculations required for Replacement prop. Type 2 &3
Answer» Explain AM & GM calculations required for Replacement prop. Type 2 &3

Discussion

1011.	Which acid is present in wine?
Answer» Which acid is present in wine?

Discussion

1012.	Which of the following will favour the decomposition of KClO3?
Answer» Which of the following will favour the decomposition of $K C l O_{3}$ ?

Discussion

1013.	The rate of a chemical reaction can be kept constant by-(a) By stirring the components(b) By keeping the temperature constant(c) None of the above(d) All of the above
Answer» The rate of a chemical reaction can be kept constant by- (a) By stirring the components (b) By keeping the temperature constant (c) None of the above (d) All of the above

1013.

The rate of a chemical reaction can be kept constant by-(a) By stirring the components(b) By keeping the temperature constant(c) None of the above(d) All of the above

Answer»

The rate of a chemical reaction can be kept constant by-

(a) By stirring the components

(b) By keeping the temperature constant

(c) None of the above

(d) All of the above

Discussion

1014.	It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD). Can you explain how?
Answer» It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD). Can you explain how?

Discussion

1015.	Question 18Classify the following as physical or chemical properties. a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.(b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.(c) Metallic sodium is soft enough to be cut with a knife.(d) Most metal oxides form alkalis on interacting with water.
Answer» Question 18 Classify the following as physical or chemical properties. a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements. (b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. (c) Metallic sodium is soft enough to be cut with a knife. (d) Most metal oxides form alkalis on interacting with water.

Discussion

1016.	The specific conductivity of a saturated solution of AgCl is 3.40×10−6 ohm−1 cm−1 at 25∘C. If λAg+=62.3 ohm−1cm2 mol−1 and λCl−=67.7 ohm−1 cm2 mol−1, the solubility of AgCl at 25∘C is:[1 mark]
Answer» The specific conductivity of a saturated solution of $A g C l$ is $3.40 \times 10^{- 6} {ohm}^{- 1} {cm}^{- 1}$ at $25^{\circ} C$ . If $λ_{A g +} = 62.3 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ and $λ_{C l^{-}} = 67.7 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ , the solubility of $A g C l$ at $25^{\circ} C$ is: [1 mark]

Discussion

1017.	44.The mass to charge ratio (m/e) for the a cation is 1.5*10-8 kg/C. What is the mass of this atom?
Answer» 44.The mass to charge ratio (m/e) for the a cation is 1.5*10-8 kg/C. What is the mass of this atom?

Discussion

1018.	How do density varies with dilution
Answer» How do density varies with dilution

Discussion

1019.	H2(g)+V2O5(s)→V2O3(s)+H2O(l) Let the coefficients for the given reaction be as follows: aH2(g)+bV2O5(s)→cV2O3(s)+dH2O(l) What will be the equations for the number of atoms of each element, so that each is balanced?
Answer» $H_{2} (g) + V_{2} O_{5} (s) \to V_{2} O_{3} (s) + H_{2} O (l)$ Let the coefficients for the given reaction be as follows: $a H_{2} (g) + b V_{2} O_{5} (s) \to c V_{2} O_{3} (s) + d H_{2} O (l)$ What will be the equations for the number of atoms of each element, so that each is balanced?

Discussion

1020.	Regular coating of paint prevents iron articles from:
Answer» Regular coating of paint prevents iron articles from:

Discussion

1021.	Why is the drip irrigation method used?
Answer» Why is the drip irrigation method used?

Discussion

1022.	Does fleece include the dead skin of the animal which is removed in the process of shearing ?
Answer» Does fleece include the dead skin of the animal which is removed in the process of shearing ?

Discussion

1023.	Copper reduces nitrate into NO and NO2 depending upon the concentration of HNO3 in solution (Assuming fixed [Cu2+] and PNO=PNO2). The HNO3 concentration at which the thermodynamic tendency for reduction of NO−3 into NO and NO2 by copper is same is 10x] M. The value of 2x is(Rounded-off to the nearest integer) [Given : E0Cu2+/cu=0.34V,E0NO−3/NO=0.96V,E0NO−3/NO2=0.79V and at RTF(2.303)=0.059]
Answer» Copper reduces nitrate into $N O$ and $N O_{2}$ depending upon the concentration of $H N O_{3}$ in solution (Assuming fixed $[C u^{2 +}]$ and $P_{N O} = P_{N O_{2}}$ ). The $H N O_{3}$ concentration at which the thermodynamic tendency for reduction of $N O_{3}^{-}$ into $N O$ and $N O_{2}$ by copper is same is $10^{x}] M$ . The value of $2 x$ is (Rounded-off to the nearest integer) [Given : $E_{C u^{2 +} / c u}^{0} = 0.34 V, E_{N O_{3}^{-} / N O}^{0} = 0.96 V, E_{N O_{3}^{-} / N O_{2}}^{0} = 0.79 V$ and at $\frac{R T}{F} (2.303) = 0.059$ ]

Discussion

1024.	The rate constant of the reaction A→B is 0.6×10−3mol L−1s−1. If the concentration of A is 5 M then concentration of B after 20 minutes is
Answer» The rate constant of the reaction $A \to B$ is $0.6 \times 10^{- 3} m o l L^{- 1} s^{- 1}$ . If the concentration of $A$ is $5 M$ then concentration of $B$ after $20$ minutes is

Discussion

1025.	Distilled water changes the colour of which of the following indicators?
Answer» Distilled water changes the colour of which of the following indicators?

Discussion

1026.	Pick the odd one out.
Answer» Pick the odd one out.

Discussion

1027.	Which of the following is/are the uses of water?
Answer» Which of the following is/are the uses of water?

Discussion

1028.	The emf of the cell with the cell reaction given below is 0.28 V at 25oC.Zn(s) + 2H+(aq)→Zn2+(aq, 0.1 M) + H2(g, 1 atm Calculate the pH of the hydrogen electrodeGiven:E0Zn2+/Zn = −0.76 VE0H+/H2 = 0 V
Answer» The emf of the cell with the cell reaction given below is $0.28 V$ at $25^{o} C$ . $Z n (s) + 2 H^{+} (a q) \to Z n^{2 +} (a q, 0.1 M) + H_{2} (g, 1 a t m$ Calculate the $p H$ of the hydrogen electrode Given: $E_{Z n^{2 +} / Z n}^{0} = - 0.76 V$ $E_{H^{+} / H_{2}}^{0} = 0 V$

Discussion

1029.	Which of the following statement is true for acids?(a) Bitter and change red litmus to blue(b) Sour and change red litmus to blue(c) Sour and change blue litmus to red(d) Bitter and change blue litmus to red
Answer» Which of the following statement is true for acids? (a) Bitter and change red litmus to blue (b) Sour and change red litmus to blue (c) Sour and change blue litmus to red (d) Bitter and change blue litmus to red

Discussion

1030.	Which of the following are causes of water shortage?
Answer» Which of the following are causes of water shortage?

Discussion

1031.	What is equivalent weight of H3po2
Answer» What is equivalent weight of H3po2

Discussion

1032.	how to find simplest ratio in definite proportion?
Answer» how to find simplest ratio in definite proportion?

Discussion

1033.	Two elements X and Y (atomic mass of X = 75, Y = 16) combine to give a compound having 76% of X. The formula of the compound is(1) xY(2) XY(4 XY
Answer» Two elements X and Y (atomic mass of X = 75, Y = 16) combine to give a compound having 76% of X. The formula of the compound is(1) xY(2) XY(4 XY

Discussion

1034.	69. In a reaction, A-Products, half life is found to be120 min when initial concentration of A is8.0 x 10-3 M, while it is 60 min when concentrationof A is 3.2 10-2 M. Then the unit of rate constantfor this reaction is(1) mol L-1 s-12) mol1/2 L-1/2 s-1(4) mol-1 L s-1(3)mol-1/2 L1/2 s-1
Answer» 69. In a reaction, A-Products, half life is found to be120 min when initial concentration of A is8.0 x 10-3 M, while it is 60 min when concentrationof A is 3.2 10-2 M. Then the unit of rate constantfor this reaction is(1) mol L-1 s-12) mol1/2 L-1/2 s-1(4) mol-1 L s-1(3)mol-1/2 L1/2 s-1

Discussion

1035.	What is an alloy?
Answer» What is an alloy?

Discussion

1036.	Rewrite the following in their correct sequence in a food chain:Snake, Grasshopper, Frog, and Grass
Answer» Rewrite the following in their correct sequence in a food chain: Snake, Grasshopper, Frog, and Grass

Discussion

1037.	Some of the equations given below are not balanced. Can you identify them? Mg+O2=MgO. ,N2+3H2=2NH3,H2O2=H2O+O2. I don't know how to balance an equation?
Answer» Some of the equations given below are not balanced. Can you identify them? Mg+O2=MgO. ,N2+3H2=2NH3,H2O2=H2O+O2. I don't know how to balance an equation?

Discussion

1038.	48. In a reaction 2X gives Y, the concentration ofX decreases from 0.50M to 0.38M in 10mins. What is the rate of the reaction in M/s during this interval
Answer» 48. In a reaction 2X gives Y, the concentration ofX decreases from 0.50M to 0.38M in 10mins. What is the rate of the reaction in M/s during this interval

Discussion

1039.	During the first step of wastewater treatment
Answer» During the first step of wastewater treatment

Discussion

1040.	the density of a piece of clay is 1.8 in C.G.S system of units. The corresponding value in S.I unit system is
Answer» the density of a piece of clay is 1.8 in C.G.S system of units. The corresponding value in S.I unit system is

Discussion

1041.	What is a physical change ?
Answer» What is a physical change ?

Discussion

1042.	Bronze is an alloy of and(a) Copper and Silver(b) Copper and Tin
Answer» Bronze is an alloy of and (a) Copper and Silver (b) Copper and Tin

Discussion

1043.	5.at 273 k and 1 atm. ,10 lt of N2O4 decomposes to NO2. what is the degree of dissociation when the original volume is 25% less than that of existing volume?
Answer» 5.at 273 k and 1 atm. ,10 lt of N2O4 decomposes to NO2. what is the degree of dissociation when the original volume is 25% less than that of existing volume?

Discussion

1044.	Is gallium a solkd or liquid?
Answer» Is gallium a solkd or liquid?

Discussion

1045.	Two elements X and Y(atomic mass of X=75,Y=16) combine to give a compound having 76%of X.The formula of the compound is
Answer» Two elements X and Y(atomic mass of X=75,Y=16) combine to give a compound having 76%of X.The formula of the compound is

Discussion

1046.	Why are thoughts not considered as matter?
Answer» Why are thoughts not considered as matter?

Discussion

1047.	Complétez avec l'article défini ou l'article partitif.
Answer» Complétez avec l'article défini ou l'article partitif.

Discussion

1048.	How many types of fibres are there?
Answer» How many types of fibres are there?

Discussion

1049.	24. When equilibrium is established in a galvanic or electrochemical cell Ecell=0, Why?
Answer» 24. When equilibrium is established in a galvanic or electrochemical cell Ecell=0, Why?

Discussion

1050.	The rate of evaporation increases with__.
Answer» The rate of evaporation increases with__.

Discussion

Explore topic-wise InterviewSolutions in .

72.Calcium carbide + water = ? Is carbon dioxide is released in the teaction ?give reason why /why not?

How are the types of underground stem differs from each other?

Shear stress is ___

Vant hoff factor of HgCl2 in its aqueous solution will be (HgCl2 is 80% ionized in the solution)

Increase in the average temperature of Earth's atmosphere is called ___ .

Why ice is solid

What is a cocoon?

What are the different types of elements? Explain each with examples.

What exactly is topical fluoride?

Explain AM & GM calculations required for Replacement prop. Type 2 &3

Which acid is present in wine?

Which of the following will favour the decomposition of KClO3?

The rate of a chemical reaction can be kept constant by-(a) By stirring the components(b) By keeping the temperature constant(c) None of the above(d) All of the above

It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD). Can you explain how?

The specific conductivity of a saturated solution of AgCl is 3.40×10−6 ohm−1 cm−1 at 25∘C. If λAg+=62.3 ohm−1cm2 mol−1 and λCl−=67.7 ohm−1 cm2 mol−1, the solubility of AgCl at 25∘C is:[1 mark]

44.The mass to charge ratio (m/e) for the a cation is 1.5*10-8 kg/C. What is the mass of this atom?

How do density varies with dilution

H2(g)+V2O5(s)→V2O3(s)+H2O(l) Let the coefficients for the given reaction be as follows: aH2(g)+bV2O5(s)→cV2O3(s)+dH2O(l) What will be the equations for the number of atoms of each element, so that each is balanced?

Regular coating of paint prevents iron articles from:

Why is the drip irrigation method used?

Does fleece include the dead skin of the animal which is removed in the process of shearing ?

The rate constant of the reaction A→B is 0.6×10−3mol L−1s−1. If the concentration of A is 5 M then concentration of B after 20 minutes is

Distilled water changes the colour of which of the following indicators?

Pick the odd one out.

Which of the following is/are the uses of water?

The emf of the cell with the cell reaction given below is 0.28 V at 25oC.Zn(s) + 2H+(aq)→Zn2+(aq, 0.1 M) + H2(g, 1 atm Calculate the pH of the hydrogen electrodeGiven:E0Zn2+/Zn = −0.76 VE0H+/H2 = 0 V

Which of the following statement is true for acids?(a) Bitter and change red litmus to blue(b) Sour and change red litmus to blue(c) Sour and change blue litmus to red(d) Bitter and change blue litmus to red

Which of the following are causes of water shortage?

What is equivalent weight of H3po2

how to find simplest ratio in definite proportion?

Two elements X and Y (atomic mass of X = 75, Y = 16) combine to give a compound having 76% of X. The formula of the compound is(1) xY(2) XY(4 XY

69. In a reaction, A-Products, half life is found to be120 min when initial concentration of A is8.0 x 10-3 M, while it is 60 min when concentrationof A is 3.2 10-2 M. Then the unit of rate constantfor this reaction is(1) mol L-1 s-12) mol1/2 L-1/2 s-1(4) mol-1 L s-1(3)mol-1/2 L1/2 s-1

What is an alloy?

Rewrite the following in their correct sequence in a food chain:Snake, Grasshopper, Frog, and Grass

Some of the equations given below are not balanced. Can you identify them? Mg+O2=MgO. ,N2+3H2=2NH3,H2O2=H2O+O2. I don't know how to balance an equation?

48. In a reaction 2X gives Y, the concentration ofX decreases from 0.50M to 0.38M in 10mins. What is the rate of the reaction in M/s during this interval

During the first step of wastewater treatment

the density of a piece of clay is 1.8 in C.G.S system of units. The corresponding value in S.I unit system is

What is a physical change ?

Bronze is an alloy of and(a) Copper and Silver(b) Copper and Tin

5.at 273 k and 1 atm. ,10 lt of N2O4 decomposes to NO2. what is the degree of dissociation when the original volume is 25% less than that of existing volume?

Is gallium a solkd or liquid?

Two elements X and Y(atomic mass of X=75,Y=16) combine to give a compound having 76%of X.The formula of the compound is

Why are thoughts not considered as matter?

Complétez avec l'article défini ou l'article partitif.

How many types of fibres are there?

24. When equilibrium is established in a galvanic or electrochemical cell Ecell=0, Why?

The rate of evaporation increases with__.