7248 + Interview Questions in Chemistry Page 83 InterviewSolution

4101.	The decomposition of a compound by heat in the absence of air is called as __.
Answer» The decomposition of a compound by heat in the absence of air is called as __.

Discussion

4102.	Classify polymers on the basis of their structure.
Answer» Classify polymers on the basis of their structure.

Discussion

4103.	Write elements of metals and non-metals?
Answer» Write elements of metals and non-metals?

Discussion

4104.	what is the number of moles of O_atom in 126 amu of HNO3?
Answer» what is the number of moles of O_atom in 126 amu of HNO3?

Discussion

4105.	About three-fourths of the earth's surface is covered with water. Why then is there a shortage of water?
Answer» About three-fourths of the earth's surface is covered with water. Why then is there a shortage of water?

Discussion

4106.	if two soap bubbles coalesces then excess pressure inside in bigger bubble is the sum of excess pressure in smaller bubbles?
Answer» if two soap bubbles coalesces then excess pressure inside in bigger bubble is the sum of excess pressure in smaller bubbles?

Discussion

4107.	Option 20 Which one of the following four metals would be displaced from the solution of its salts by other three metals?a) Mg(b) Ag(c) Zn(d) Cu
Answer» Option 20 Which one of the following four metals would be displaced from the solution of its salts by other three metals? a) $Mg$ (b) $Ag$ (c) $Zn$ (d) $Cu$

Discussion

4108.	How is valency of an element found? What is the formula of finding valency
Answer» How is valency of an element found? What is the formula of finding valency

4108.

How is valency of an element found? What is the formula of finding valency

Answer»

How is valency of an element found?

What is the formula of finding valency

Discussion

4109.	Which of the following will show “Tyndall effect”?a. Salt solutionb. Milkc. Copper sulphate solutiond. Starch solution
Answer» Which of the following will show “Tyndall effect”? a. Salt solution b. Milk c. Copper sulphate solution d. Starch solution

Discussion

4110.	Why are alkali metals highly reactive in air?
Answer» Why are alkali metals highly reactive in air?

Discussion

4111.	Raj's mother served him Horlicks with milk. But there were some particles of Horlicks left un-dissolved, and so he asked his mother to remove those particles. What method of separation should his mother use? Why?
Answer» Raj's mother served him Horlicks with milk. But there were some particles of Horlicks left un-dissolved, and so he asked his mother to remove those particles. What method of separation should his mother use? Why?

Discussion

4112.	Bleaching powder contains a salt of an oxoacid as one of its components. This anhydride of that oxoacid is
Answer» Bleaching powder contains a salt of an oxoacid as one of its components. This anhydride of that oxoacid is

Discussion

4113.	compare the acidic strength of ch3Na and Ch3Cl.
Answer» compare the acidic strength of ch3Na and Ch3Cl.

Discussion

4114.	Give one use of carbon monoxide.
Answer» Give one use of carbon monoxide.

Discussion

4115.	Name the MONOMERS which when joined together by chemical bonds in a fixed arrangement forms Nylon, Rayon and Polyester.
Answer» Name the MONOMERS which when joined together by chemical bonds in a fixed arrangement forms Nylon, Rayon and Polyester.

Discussion

4116.	CThe solubility product of Agl at 25^° C is1.0 x 10-16 mol2 L-2.solution of KI at 25^° C is approximately (in mol L-1)The solubility of Agl in 104 M(1) 1.0 10-16(2)1.0x 10-12(3) 1.0 x 10-101.0x 10-8(4)9alt
Answer» CThe solubility product of Agl at 25^° C is1.0 x 10-16 mol2 L-2.solution of KI at 25^° C is approximately (in mol L-1)The solubility of Agl in 104 M(1) 1.0 10-16(2)1.0x 10-12(3) 1.0 x 10-101.0x 10-8(4)9alt

Discussion

4117.	Question 2Which of the following statements is not true about an atom?(a) Atoms are not able to exist independently(b) Atoms are the basic units from which molecules and ions are formed(c) Atoms are always neutral in nature(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch
Answer» Question 2 Which of the following statements is not true about an atom? (a) Atoms are not able to exist independently (b) Atoms are the basic units from which molecules and ions are formed (c) Atoms are always neutral in nature (d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch

Discussion

4118.	In the given reaction, MA is a metal A and MB is a metal B. Choose the correct options regarding the reactivities of MA and MB. MA+Salt of MB →MB+Salt of MA
Answer» In the given reaction, $M_{A}$ is a metal A and $M_{B}$ is a metal B. Choose the correct options regarding the reactivities of $M_{A}$ and $M_{B}$ . $M_{A} + S a l t o f M_{B}$ $\to M_{B} + S a l t o f M_{A}$

Discussion

4119.	Question 131(i)This table shows the mass of one atom for five chemical elements.Use it to answer the questions given.ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27Which is the heaviest element?
Answer» Question 131(i) This table shows the mass of one atom for five chemical elements. Use it to answer the questions given. $\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$ Which is the heaviest element?

4119.

Question 131(i)This table shows the mass of one atom for five chemical elements.Use it to answer the questions given.ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27Which is the heaviest element?

Answer»

Question 131(i)

This table shows the mass of one atom for five chemical elements.

Use it to answer the questions given.

$\begin{matrix} E l e m e n t s & M a s s o f a t o m (k g) T i t a n i u m & 7.95 \times 10^{- 26} L e a d & 3.44 \times 10^{- 25} S i l v e r & 1.79 \times 10^{- 25} L i t h i u m & 1.15 \times 10^{- 26} H y d r o g e n & 1.674 \times 10^{- 27} \end{matrix}$

Which is the heaviest element?

Discussion

4120.	Explain how petroleum and natural gas are formed.
Answer» Explain how petroleum and natural gas are formed.

Discussion

4121.	According to the law of conservation of energy energy can neither be created nor be destroyed . Then how did energy come in to existence ? If it was not created then how is it present ?
Answer» According to the law of conservation of energy energy can neither be created nor be destroyed . Then how did energy come in to existence ? If it was not created then how is it present ?

Discussion

4122.	Which component was high in quantity in Wootz steel?
Answer» Which component was high in quantity in Wootz steel?

Discussion

4123.	A Carnot engine has an efficiency of 20%. When temperature of sink is reduced by 80°C, it's efficiency is doubled. The temperature of source is
Answer» A Carnot engine has an efficiency of 20%. When temperature of sink is reduced by 80°C, it's efficiency is doubled. The temperature of source is

Discussion

4124.	The molar enthalpy of formation of CO2(s) is equal to (1) Zero(2) Molar heat of combustion of CO(g) (3) The sum of molar enthalpies of formation of CO(g) and O2(g) (4) The molar heat of combustion of graphite
Answer» The molar enthalpy of formation of CO2(s) is equal to (1) Zero (2) Molar heat of combustion of CO(g) (3) The sum of molar enthalpies of formation of CO(g) and O2(g) (4) The molar heat of combustion of graphite

Discussion

4125.	Mention briefly the salient features of Dalton's atomic theory (five points).
Answer» Mention briefly the salient features of Dalton's atomic theory (five points).

Discussion

4126.	Carbon is the long term storage of carbon in underground cavities or biomass rather than atmosphere.
Answer» Carbon is the long term storage of carbon in underground cavities or biomass rather than atmosphere.

Discussion

4127.	Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe ?
Answer» Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe ?

Discussion

4128.	Explain the statement plastic are non corrosive
Answer» Explain the statement plastic are non corrosive

Discussion

4129.	For the structure shown below, the degree of static indeterminacy is_________.9
Answer» For the structure shown below, the degree of static indeterminacy is_________. 9

Discussion

4130.	Why mole fractions in vapour phase and in solution is different ?
Answer» Why mole fractions in vapour phase and in solution is different ?

Discussion

4131.	The oxidation of SO_2 and O_2 is an exothermic reaction.The yield of SO_3 will be maximum if a)temp. and pressure both are increased b)temp. decreased,pressure increased c)temp. increased,pressure cons†an t d)temp. and pressure both decrease
Answer» The oxidation of SO_2 and O_2 is an exothermic reaction.The yield of SO_3 will be maximum if a)temp. and pressure both are increased b)temp. decreased,pressure increased c)temp. increased,pressure cons†an t d)temp. and pressure both decrease

Discussion

4132.	Which observation does not indicate that a chemical reaction has occurred?
Answer» Which observation does not indicate that a chemical reaction has occurred?

Discussion

4133.	This reaction is an example of:
Answer» This reaction is an example of:

Discussion

4134.	What is the relation between b value and compressibility?
Answer» What is the relation between b value and compressibility?

Discussion

4135.	Find the number of electrons having n + l is equal to 4 for zinc atom.
Answer» Find the number of electrons having n + l is equal to 4 for zinc atom.

Discussion

4136.	Increase in the amount of CO2 in air results in:
Answer» Increase in the amount of $C O_{2}$ in air results in:

Discussion

4137.	Which product is obtained during the processing of coal to obtain coke?
Answer» Which product is obtained during the processing of coal to obtain coke?

Discussion

4138.	Question 2 (a)What is the physical state of water at:a.250∘C
Answer» Question 2 (a) What is the physical state of water at: $a . 250^{\circ} C$

Discussion

4139.	One liter of co2 is passed through red hot coke the volume becomes 1.4 litres at same temperature and pressure. The composition of products is 1)0.8 Liter of co2 and 0.6 liter of co 2)0.7 Liter of co2 and 0.7 liter of co 3)0.6 Liter of co2 and 0.8 liter of co 4)0.4 Liter of co2 and 1.0 liter of co
Answer» One liter of co2 is passed through red hot coke the volume becomes 1.4 litres at same temperature and pressure. The composition of products is 1)0.8 Liter of co2 and 0.6 liter of co 2)0.7 Liter of co2 and 0.7 liter of co 3)0.6 Liter of co2 and 0.8 liter of co 4)0.4 Liter of co2 and 1.0 liter of co

Discussion

4140.	Is burning always an exothermic reaction?
Answer» Is burning always an exothermic reaction?

Discussion

4141.	space does not have oxygen then how is sun burning
Answer» space does not have oxygen then how is sun burning

Discussion

4142.	Carbon reacts with chlorine to form ccl4. 36gm of carbon was mixed with 142gm of cl2calculTe the mass of ccl4producedand the remaining mass of reactant.
Answer» Carbon reacts with chlorine to form ccl4. 36gm of carbon was mixed with 142gm of cl2calculTe the mass of ccl4producedand the remaining mass of reactant.

Discussion

4143.	Which of the following statements is/are incorrect for reducing global warming?
Answer» Which of the following statements is/are incorrect for reducing global warming?

Discussion

4144.	In an organic compound, oxygen is M times of hydrogen and hydrogen is N times of C present and present by mass. The empirical formula of the compound is :-
Answer» In an organic compound, oxygen is M times of hydrogen and hydrogen is N times of C present and present by mass. The empirical formula of the compound is :-

Discussion

4145.	___________ gas is responsible for combustion.
Answer» ___________ gas is responsible for combustion.

Discussion

4146.	PET is ___ .
Answer» PET is ___ .

Discussion

4147.	What is the value of sigma of 25th electron of manganese?
Answer» What is the value of sigma of 25th electron of manganese?

Discussion

4148.	using electrolytic method the cost of production of 5 L of oxygen at stp is rupees X cost of production of same volume of hydrogen at stp will be
Answer» using electrolytic method the cost of production of 5 L of oxygen at stp is rupees X cost of production of same volume of hydrogen at stp will be

Discussion

4149.	Question 3Draw a sketch of Bohr’s model of an atom with three shells?
Answer» Question 3 Draw a sketch of Bohr’s model of an atom with three shells?

Discussion

4150.	The percentage by volume of C3H8 in gaseous mixture of C3H8,CH4, CO is 20. Calculate the volume of CO2 produced by complete combustion under similar condition 1. 90 ml 2. 160ml 3. 140ml 4. 200ml
Answer» The percentage by volume of C3H8 in gaseous mixture of C3H8,CH4, CO is 20. Calculate the volume of CO2 produced by complete combustion under similar condition 1. 90 ml 2. 160ml 3. 140ml 4. 200ml

Discussion

Explore topic-wise InterviewSolutions in .

The decomposition of a compound by heat in the absence of air is called as __.

Classify polymers on the basis of their structure.

Write elements of metals and non-metals?

what is the number of moles of O_atom in 126 amu of HNO3?

About three-fourths of the earth's surface is covered with water. Why then is there a shortage of water?

if two soap bubbles coalesces then excess pressure inside in bigger bubble is the sum of excess pressure in smaller bubbles?

Option 20 Which one of the following four metals would be displaced from the solution of its salts by other three metals?a) Mg(b) Ag(c) Zn(d) Cu

How is valency of an element found? What is the formula of finding valency

Which of the following will show “Tyndall effect”?a. Salt solutionb. Milkc. Copper sulphate solutiond. Starch solution

Why are alkali metals highly reactive in air?

Raj's mother served him Horlicks with milk. But there were some particles of Horlicks left un-dissolved, and so he asked his mother to remove those particles. What method of separation should his mother use? Why?

Bleaching powder contains a salt of an oxoacid as one of its components. This anhydride of that oxoacid is

compare the acidic strength of ch3Na and Ch3Cl.

Give one use of carbon monoxide.

Name the MONOMERS which when joined together by chemical bonds in a fixed arrangement forms Nylon, Rayon and Polyester.

CThe solubility product of Agl at 25^° C is1.0 x 10-16 mol2 L-2.solution of KI at 25^° C is approximately (in mol L-1)The solubility of Agl in 104 M(1) 1.0 10-16(2)1.0x 10-12(3) 1.0 x 10-101.0x 10-8(4)9alt

In the given reaction, MA is a metal A and MB is a metal B. Choose the correct options regarding the reactivities of MA and MB. MA+Salt of MB →MB+Salt of MA

Question 131(i)This table shows the mass of one atom for five chemical elements.Use it to answer the questions given.ElementsMass of atom(kg)Titanium7.95×10−26Lead3.44×10−25Silver1.79×10−25Lithium1.15×10−26Hydrogen1.674×10−27Which is the heaviest element?

Explain how petroleum and natural gas are formed.

According to the law of conservation of energy energy can neither be created nor be destroyed . Then how did energy come in to existence ? If it was not created then how is it present ?

Which component was high in quantity in Wootz steel?

A Carnot engine has an efficiency of 20%. When temperature of sink is reduced by 80°C, it's efficiency is doubled. The temperature of source is

The molar enthalpy of formation of CO2(s) is equal to (1) Zero(2) Molar heat of combustion of CO(g) (3) The sum of molar enthalpies of formation of CO(g) and O2(g) (4) The molar heat of combustion of graphite

Mention briefly the salient features of Dalton's atomic theory (five points).

Carbon is the long term storage of carbon in underground cavities or biomass rather than atmosphere.

Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe ?

Explain the statement plastic are non corrosive

For the structure shown below, the degree of static indeterminacy is_________.9

Why mole fractions in vapour phase and in solution is different ?

The oxidation of SO_2 and O_2 is an exothermic reaction.The yield of SO_3 will be maximum if a)temp. and pressure both are increased b)temp. decreased,pressure increased c)temp. increased,pressure cons†an t d)temp. and pressure both decrease

Which observation does not indicate that a chemical reaction has occurred?

This reaction is an example of:

What is the relation between b value and compressibility?

Find the number of electrons having n + l is equal to 4 for zinc atom.

Increase in the amount of CO2 in air results in:

Which product is obtained during the processing of coal to obtain coke?

Question 2 (a)What is the physical state of water at:a.250∘C

One liter of co2 is passed through red hot coke the volume becomes 1.4 litres at same temperature and pressure. The composition of products is 1)0.8 Liter of co2 and 0.6 liter of co 2)0.7 Liter of co2 and 0.7 liter of co 3)0.6 Liter of co2 and 0.8 liter of co 4)0.4 Liter of co2 and 1.0 liter of co

Is burning always an exothermic reaction?

space does not have oxygen then how is sun burning

Carbon reacts with chlorine to form ccl4. 36gm of carbon was mixed with 142gm of cl2calculTe the mass of ccl4producedand the remaining mass of reactant.

Which of the following statements is/are incorrect for reducing global warming?

In an organic compound, oxygen is M times of hydrogen and hydrogen is N times of C present and present by mass. The empirical formula of the compound is :-

___________ gas is responsible for combustion.

PET is ___ .

What is the value of sigma of 25th electron of manganese?

using electrolytic method the cost of production of 5 L of oxygen at stp is rupees X cost of production of same volume of hydrogen at stp will be

Question 3Draw a sketch of Bohr’s model of an atom with three shells?

The percentage by volume of C3H8 in gaseous mixture of C3H8,CH4, CO is 20. Calculate the volume of CO2 produced by complete combustion under similar condition 1. 90 ml 2. 160ml 3. 140ml 4. 200ml