5083 + Interview Questions in Chemistry Page 25 InterviewSolution

1201.	For the reaction, BrO−3(aq)+5Br−(aq)+6H+→3Br2(l)+3H2O(l), the rate equation can be expressed in two ways d[Br2]dt=k[Br−][BrO3][H+]2 and −d[Br−]dt=k′[Br−][BrO3][H+]2Here, k and k' are related as
Answer» For the reaction, $B r O_{3}^{-} (a q) + 5 B r^{-} (a q) + 6 H^{+} \to 3 B r_{2} (l) + 3 H_{2} O (l)$ , the rate equation can be expressed in two ways $\frac{d [B r_{2}]}{d t} = k [B r^{-}] [B r O_{3}] [H^{+}]^{2}$ and $- \frac{d [B r^{-}]}{d t} = k^{'} [B r^{-}] [B r O_{3}] [H^{+}]^{2}$ Here, k and k' are related as

Discussion

1202.	For which of the following elements the sequence of increasing atomic masses was inverted in Mendeleev’s periodic table?
Answer» For which of the following elements the sequence of increasing atomic masses was inverted in Mendeleev’s periodic table?

Discussion

1203.	All the energy released from the reaction X→Y;ΔG∘=−193 kJ mol−1 is used for oxidizing M+ as M+→M3++2e−; E∘=−0.25V. Under standard conditions the number of moles of M+ is(Given : [F=96500Cmol−1])
Answer» All the energy released from the reaction $X \to Y; Δ G^{\circ} = - 193 {kJ mol}^{- 1}$ is used for oxidizing $M^{+}$ as $M^{+} \to M^{3 +} + 2 e^{-}; E^{\circ} = - 0.25 V$ . Under standard conditions the number of moles of $M^{+}$ is (Given : $[F = 96500 C m o l^{- 1}]$ )

Discussion

1204.	If carbon-dioxide is the most important gas,then why is it harmful?
Answer» If carbon-dioxide is the most important gas,then why is it harmful?

Discussion

1205.	28. Magnetite is an iron oxide ore, which reacts with carbon monoxide to give iron metal and carbon dioxide. When a sample of magnetite is allowed to react with sufficient carbon monoxide, 0.896 L carbon dioxide was produced at NTP. The percentage of iron in magnetite can also be determined by dissolving the ore in acid, then reducing the iron to Fe2+ completely and finally titrating it with aqueous acidic KMnO4. The atomic weights of Fe, C and O are 58.8, 12.0 and 16.0 a.m.u., respectively. The correct statement(s) is/are (A) The mass of iron formed is 1.76 g. (B) The number of electrons involved in the redox reaction during titration is 5. (C) The paramagnetism of the solution decreases during the reaction of Fe2+ with KMnO4. (D) During the titration, manganese containing species changes its geometry from square planar to tetrahedral.
Answer» 28. Magnetite is an iron oxide ore, which reacts with carbon monoxide to give iron metal and carbon dioxide. When a sample of magnetite is allowed to react with sufficient carbon monoxide, 0.896 L carbon dioxide was produced at NTP. The percentage of iron in magnetite can also be determined by dissolving the ore in acid, then reducing the iron to Fe2+ completely and finally titrating it with aqueous acidic KMnO4. The atomic weights of Fe, C and O are 58.8, 12.0 and 16.0 a.m.u., respectively. The correct statement(s) is/are (A) The mass of iron formed is 1.76 g. (B) The number of electrons involved in the redox reaction during titration is 5. (C) The paramagnetism of the solution decreases during the reaction of Fe2+ with KMnO4. (D) During the titration, manganese containing species changes its geometry from square planar to tetrahedral.

Discussion

1206.	The non-metal which occurs as a yellow powder is _____
Answer» The non-metal which occurs as a yellow powder is _____

Discussion

1207.	What are the steps involved in the purification of drinking watersupplied in cities and towns?
Answer» What are the steps involved in the purification of drinking water supplied in cities and towns?

Discussion

1208.	Describe the Cat and Dad situation in the beginning and at the end of the poem.
Answer» Describe the Cat and Dad situation in the beginning and at the end of the poem.

Discussion

1209.	Why do theore basic metals remain in the solution and the less basic ones form the anode mud in the electrolytic refining?
Answer» Why do theore basic metals remain in the solution and the less basic ones form the anode mud in the electrolytic refining?

Discussion

1210.	What will happen if you mix an indicator with another indicator?
Answer» What will happen if you mix an indicator with another indicator?

Discussion

1211.	Write the chemical formula of glucose and carbon dioxide.
Answer» Write the chemical formula of glucose and carbon dioxide.

Discussion

1212.	Question 20 Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.
Answer» Question 20 Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.

1212.

Question 20 Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.

Answer»

Question 20

Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.

Discussion

1213.	Does kcl and kbr follow the law of multiple proportions. If yes how or how not?
Answer» Does kcl and kbr follow the law of multiple proportions. If yes how or how not?

Discussion

1214.	A solution containing one mol/L of each Cu(NO3)2;AgNO3;Hg2(NO3)2;Mg(NO3)2 is being electrolyzedby using inert electrodes. The values of standard electrode potentials (reduction potentials) are Ag+/Ag=0.80 volt , Hg++2/2Hg=0.79 volt, Cu++/Cu=0.24 volt; Mg++/Mg=−2.37 volt. With increasing voltage the sequence of deposition of metals on the cathode will be:
Answer» A solution containing one $mol/L$ of each $C u (N O_{3})_{2}; A g N O_{3}; H g_{2} (N O_{3})_{2}; M g (N O_{3})_{2}$ is being electrolyzedby using inert electrodes. The values of standard electrode potentials (reduction potentials) are $A g^{+} / A g = 0.80 volt$ , $H g_{2}^{+ +} / 2 H g = 0.79 volt$ , $C u^{+ +} / C u = 0.24 volt$ ; $M g^{+ +} / M g = - 2.37 volt$ . With increasing voltage the sequence of deposition of metals on the cathode will be:

Discussion

1215.	For the cell:Tl(s)\|Tl+(0.001M)\|\|Cu2+(0.1M)\|Cu(s):Ecell = 0.83 V at 298 K, The cell potential can be increased by
Answer» For the cell: $T l_{(s)} \| T l^{+} (0.001 M) \| \| C u^{2 +} (0.1 M) \| C u_{(s)} :$ $E_{c e l l}$ = 0.83 V at 298 K, The cell potential can be increased by

Discussion

1216.	Which type of element exhibits both metallic and non-metallic behaviour?
Answer» Which type of element exhibits both metallic and non-metallic behaviour?

Discussion

1217.	This is an illustration of cutting some papers stars out of a sheet of paper.Which of the following statements do you think is INCORRECT regarding this?
Answer» This is an illustration of cutting some papers stars out of a sheet of paper. Which of the following statements do you think is INCORRECT regarding this?

1217.

This is an illustration of cutting some papers stars out of a sheet of paper.Which of the following statements do you think is INCORRECT regarding this?

Answer»

This is an illustration of cutting some papers stars out of a sheet of paper.

Which of the following statements do you think is INCORRECT regarding this?

Discussion

1218.

Match the pairs. a. Photosynthesis i. Tendency to lose electrons b. Water ii. Reactant in combustion process c. Sodium chloride iii. Chemical change d. Dissolution of salt in water iv. Covalent bond e. Carbon v. Ionic bond f. Fluorine vi. physical change g. Magnesium vii. Tendency to form anion

Answer» Match the pairs.

a. Photosynthesis	i. Tendency to lose electrons
b. Water	ii. Reactant in combustion process
c. Sodium chloride	iii. Chemical change
d. Dissolution of salt in water	iv. Covalent bond
e. Carbon	v. Ionic bond
f. Fluorine	vi. physical change
g. Magnesium	vii. Tendency to form anion

Discussion

1219.	For a chemical reaction, Keq is 100 at 300K, the value of ΔG0 is -xR Joule at 1 atm pressure. Find the value of x. (Use ln 10 = 2.3)
Answer» For a chemical reaction, $K_{e q}$ is 100 at 300K, the value of $Δ G^{0}$ is - $x$ R Joule at 1 $a t m$ pressure. Find the value of x. (Use $l n$ 10 = 2.3)

Discussion

1220.	Particles of matter ___ each other.
Answer» Particles of matter ___ each other.

Discussion

1221.	Why do HCl, HNO3 , etc. show acidic character in aqueous solutions while solutions of compounds like, C2H5OH and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]
Answer» Why do $HCl$ , ${HNO}_{3}$ , etc. show acidic character in aqueous solutions while solutions of compounds like, $C_{2} H_{5} OH$ and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]

Discussion

1222.	Filtration is helpful in separating an insoluble __________ from a __________.
Answer» Filtration is helpful in separating an insoluble __________ from a __________.

Discussion

1223.	What do you mean by weaving and knitting?
Answer» What do you mean by weaving and knitting?

Discussion

1224.	When 10g of 80% pure CaCO3 is decomposed to give CaO and CO2, then how many molecules of CO2 will form?
Answer» When 10g of 80% pure CaCO3 is decomposed to give CaO and CO2, then how many molecules of CO2 will form?

Discussion

1225.	The following changes are examples of ________ change.
Answer» The following changes are examples of ________ change.

Discussion

1226.	Which of the following sets of quantum numbers represents the highest energy of an atom 1]n=3, l=2, m=1, s=+1/22]n=3, l=2, m=1, s=-1/23]n=4, l=0, m=0, s=+1/24]n=3, l=0, m=0, s=+1/2
Answer» Which of the following sets of quantum numbers represents the highest energy of an atom 1]n=3, l=2, m=1, s=+1/2 2]n=3, l=2, m=1, s=-1/2 3]n=4, l=0, m=0, s=+1/2 4]n=3, l=0, m=0, s=+1/2

Discussion

1227.	Can PCl5 act as an oxidising as well as a reducing agent? Justify.
Answer» Can PCl5 act as an oxidising as well as a reducing agent? Justify.

Discussion

1228.	Which of the following can be measured by the Ostwald-Walker dynamic method(a) Vapour pressure of the solvent(b) Relative lowering of vapour pressure(c) Lowering of vapour pressure(d) All of these
Answer» Which of the following can be measured by the Ostwald-Walker dynamic method(a) Vapour pressure of the solvent(b) Relative lowering of vapour pressure(c) Lowering of vapour pressure(d) All of these

Discussion

1229.	Which among the following equation gives the correct relation between resistance (R), length of conductor (L), area of the cross-section of the conductor (A) and resistivity(ρ)?
Answer» Which among the following equation gives the correct relation between resistance $(R)$ , length of conductor $(L)$ , area of the cross-section of the conductor $(A)$ and resistivity $(ρ)$ ?

Discussion

1230.	how to find number of gram atoms of water
Answer» how to find number of gram atoms of water

Discussion

1231.	Which of the following is a molecule of compound?
Answer» Which of the following is a molecule of compound?

Discussion

1232.	How does increasing population affect the water table if the amount of rainfall does not vary much in a region?
Answer» How does increasing population affect the water table if the amount of rainfall does not vary much in a region?

Discussion

1233.	Is all decomposition reactions are endothermic reactions? If no, then tell the decomposition reactions which are not endothermic.
Answer» Is all decomposition reactions are endothermic reactions? If no, then tell the decomposition reactions which are not endothermic.

Discussion

1234.	The electrolyte having maximum floccualtion value for AgI/Ag+ solution is:
Answer» The electrolyte having maximum floccualtion value for $A g I / A g^{+}$ solution is:

Discussion

1235.	Question 8: Define Freezing. What is the freezing point of water? What is dry ice?
Answer» Question 8: Define Freezing. What is the freezing point of water? What is dry ice?

1235.

Question 8: Define Freezing. What is the freezing point of water? What is dry ice?

Answer»

Question 8:

Define Freezing. What is the freezing point of water?

What is dry ice?

Discussion

1236.	is added to remove the hardness of water.
Answer» is added to remove the hardness of water.

Discussion

1237.	Fill in the blanks. (a) The density of water is ………… g/cc. (b) A substance that dissolves in a liquid is called a ………… . (c) When a solute and a solvent mix in each other completely we get a ………… .
Answer» Fill in the blanks. (a) The density of water is ………… g/cc. (b) A substance that dissolves in a liquid is called a ………… . (c) When a solute and a solvent mix in each other completely we get a ………… .

1237.

Fill in the blanks. (a) The density of water is ………… g/cc. (b) A substance that dissolves in a liquid is called a ………… . (c) When a solute and a solvent mix in each other completely we get a ………… .

Answer»

Fill in the blanks.

(a) The density of water is ………… g/cc.

(b) A substance that dissolves in a liquid is called a ………… .

(c) When a solute and a solvent mix in each other completely we get a ………… .

Discussion

1238.	10gm of CaCO3 upon strong heating is observed to produce 1.1gm of CO2,then find % purity of CaCO3?
Answer» 10gm of CaCO3 upon strong heating is observed to produce 1.1gm of CO2,then find % purity of CaCO3?

Discussion

1239.	how to find two cells are with same polarity or diff
Answer» how to find two cells are with same polarity or diff

Discussion

1240.	The molar conductivity of 0.04 M solution of MgCl2 is 200 Scm2mol−1 at 298 K. A cell with electrodes that are 2.0 cm2 in surface area and 0.50 cm apart is filled with MgCl2 solution.Specific conductance of MgCl2 solution is:[1 Mark]
Answer» The molar conductivity of $0.04 M$ solution of $M g C l_{2}$ is $200 S c m^{2} m o l^{- 1}$ at $298 K$ . A cell with electrodes that are $2.0 {cm}^{2}$ in surface area and $0.50 cm$ apart is filled with $M g C l_{2}$ solution. Specific conductance of $M g C l_{2}$ solution is: [1 Mark]

Discussion

1241.	Why i is water kept in carthen pot cooler
Answer» Why i is water kept in carthen pot cooler

Discussion

1242.	Match the following correctly. [3 MARKS] a) Cleaning of water is a process ofi) sewage treatment plantb) Waste water released by houses is calledii) removing pollutantsc) Dried sludge is used asiii) low cost disposal systemsd) Drains get blocked byiv) manuree) Waste water is treated inv) sewagef) Septic tanks, chemical toilets, composting pits are examples ofvi) cooking oils and fats
Answer» Match the following correctly. [3 MARKS] $\begin{matrix} a) C l e a n i n g o f w a t e r i s a p r o c e s s o f & i) s e w a g e t r e a t m e n t p l a n t b) W a s t e w a t e r r e l e a s e d b y h o u s e s i s c a l l e d & i i) r e m o v i n g p o l l u t a n t s c) D r i e d s l u d g e i s u s e d a s & i i i) l o w c o s t d i s p o s a l s y s t e m s d) D r a i n s g e t b l o c k e d b y & i v) m a n u r e e) W a s t e w a t e r i s t r e a t e d i n & v) s e w a g e f) S e p t i c t a n k s, c h e m i c a l t o i l e t s, c o m p o s t i n g p i t s a r e e x a m p l e s o f & v i) c o o k i n g o i l s a n d f a t s \end{matrix}$

Discussion

1243.	what is effective collision?
Answer» what is effective collision?

Discussion

1244.	38. how many electrons are present in 48g sulphate ion?
Answer» 38. how many electrons are present in 48g sulphate ion?

Discussion

1245.	Why are catalysts used in chemical reaction?
Answer» Why are catalysts used in chemical reaction?

Discussion

1246.	In a chemical equilibrium the rate constant of thebackward reaction is 7.5 x 104 and the equilibriumconstant is 1.5. So the rate constant of the forwardareaction is(1) 2 x 10-3(2) 15 x 10-(3) 1.125 x 10-3(4) 9.0 x 10
Answer» In a chemical equilibrium the rate constant of thebackward reaction is 7.5 x 104 and the equilibriumconstant is 1.5. So the rate constant of the forwardareaction is(1) 2 x 10-3(2) 15 x 10-(3) 1.125 x 10-3(4) 9.0 x 10

Discussion

1247.	According to law of conservation of mass, during a chemical reaction:
Answer» According to law of conservation of mass, during a chemical reaction:

Discussion

1248.	Why neon is used in advertising glow tunes?
Answer» Why neon is used in advertising glow tunes?

Discussion

1249.	If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
Answer» If the rate constant for a first order reaction is k, the time (t) required for the completion of $99 %$ of the reaction is given by:

Discussion

1250.

(this chapters name is ecosystem not population ) how might studying ecosytem help to conserve endangered species?

Answer»

(this chapters name is ecosystem not population )

how might studying ecosytem help to conserve endangered species?

Discussion

Explore topic-wise InterviewSolutions in .

For the reaction, BrO−3(aq)+5Br−(aq)+6H+→3Br2(l)+3H2O(l), the rate equation can be expressed in two ways d[Br2]dt=k[Br−][BrO3][H+]2 and −d[Br−]dt=k′[Br−][BrO3][H+]2Here, k and k' are related as

For which of the following elements the sequence of increasing atomic masses was inverted in Mendeleev’s periodic table?

All the energy released from the reaction X→Y;ΔG∘=−193 kJ mol−1 is used for oxidizing M+ as M+→M3++2e−; E∘=−0.25V. Under standard conditions the number of moles of M+ is(Given : [F=96500Cmol−1])

If carbon-dioxide is the most important gas,then why is it harmful?

The non-metal which occurs as a yellow powder is _____

What are the steps involved in the purification of drinking watersupplied in cities and towns?

Describe the Cat and Dad situation in the beginning and at the end of the poem.

Why do theore basic metals remain in the solution and the less basic ones form the anode mud in the electrolytic refining?

What will happen if you mix an indicator with another indicator?

Write the chemical formula of glucose and carbon dioxide.

Question 20 Several terms related to soil are hidden in the squares given as Figure 9.2. Spot them and make a list.Two examples are given for you.

Does kcl and kbr follow the law of multiple proportions. If yes how or how not?

For the cell:Tl(s)|Tl+(0.001M)||Cu2+(0.1M)|Cu(s):Ecell = 0.83 V at 298 K, The cell potential can be increased by

Which type of element exhibits both metallic and non-metallic behaviour?

This is an illustration of cutting some papers stars out of a sheet of paper.Which of the following statements do you think is INCORRECT regarding this?

Match the pairs. a. Photosynthesis i. Tendency to lose electrons b. Water ii. Reactant in combustion process c. Sodium chloride iii. Chemical change d. Dissolution of salt in water iv. Covalent bond e. Carbon v. Ionic bond f. Fluorine vi. physical change g. Magnesium vii. Tendency to form anion

For a chemical reaction, Keq is 100 at 300K, the value of ΔG0 is -xR Joule at 1 atm pressure. Find the value of x. (Use ln 10 = 2.3)

Particles of matter ___ each other.

Why do HCl, HNO3 , etc. show acidic character in aqueous solutions while solutions of compounds like, C2H5OH and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]

Filtration is helpful in separating an insoluble __________ from a __________.

What do you mean by weaving and knitting?

When 10g of 80% pure CaCO3 is decomposed to give CaO and CO2, then how many molecules of CO2 will form?

The following changes are examples of ________ change.

Which of the following sets of quantum numbers represents the highest energy of an atom 1]n=3, l=2, m=1, s=+1/22]n=3, l=2, m=1, s=-1/23]n=4, l=0, m=0, s=+1/24]n=3, l=0, m=0, s=+1/2

Can PCl5 act as an oxidising as well as a reducing agent? Justify.

Which of the following can be measured by the Ostwald-Walker dynamic method(a) Vapour pressure of the solvent(b) Relative lowering of vapour pressure(c) Lowering of vapour pressure(d) All of these

Which among the following equation gives the correct relation between resistance (R), length of conductor (L), area of the cross-section of the conductor (A) and resistivity(ρ)?

how to find number of gram atoms of water

Which of the following is a molecule of compound?

How does increasing population affect the water table if the amount of rainfall does not vary much in a region?

Is all decomposition reactions are endothermic reactions? If no, then tell the decomposition reactions which are not endothermic.

The electrolyte having maximum floccualtion value for AgI/Ag+ solution is:

Question 8: Define Freezing. What is the freezing point of water? What is dry ice?

is added to remove the hardness of water.

Fill in the blanks. (a) The density of water is ………… g/cc. (b) A substance that dissolves in a liquid is called a ………… . (c) When a solute and a solvent mix in each other completely we get a ………… .

10gm of CaCO3 upon strong heating is observed to produce 1.1gm of CO2,then find % purity of CaCO3?

how to find two cells are with same polarity or diff

The molar conductivity of 0.04 M solution of MgCl2 is 200 Scm2mol−1 at 298 K. A cell with electrodes that are 2.0 cm2 in surface area and 0.50 cm apart is filled with MgCl2 solution.Specific conductance of MgCl2 solution is:[1 Mark]

Why i is water kept in carthen pot cooler

what is effective collision?

38. how many electrons are present in 48g sulphate ion?

Why are catalysts used in chemical reaction?

In a chemical equilibrium the rate constant of thebackward reaction is 7.5 x 104 and the equilibriumconstant is 1.5. So the rate constant of the forwardareaction is(1) 2 x 10-3(2) 15 x 10-(3) 1.125 x 10-3(4) 9.0 x 10

According to law of conservation of mass, during a chemical reaction:

Why neon is used in advertising glow tunes?

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:

(this chapters name is ecosystem not population ) how might studying ecosytem help to conserve endangered species?

Filtration is helpful in separating an insoluble from a .