7248 + Interview Questions in Chemistry Page 79 InterviewSolution

3901.	Petrochemicals are not used in the manufacture of
Answer» Petrochemicals are not used in the manufacture of

Discussion

3902.	At STP, a container has 3 moles of He, 3 moles of O2 and 4 moles N2. Without changing total pressure, if 2 moles of O2 is removed, the partial pressure of O2 will be decreased by:
Answer» At STP, a container has $3$ moles of $H e, 3$ moles of $O_{2}$ and $4$ moles $N_{2}$ . Without changing total pressure, if $2$ moles of $O_{2}$ is removed, the partial pressure of $O_{2}$ will be decreased by:

Discussion

3903.	Why zinc have high lionisation energy
Answer» Why zinc have high lionisation energy

Discussion

3904.	The heat of combustion of solid benzoic acid at constant volume is -321.3 kJ at 27^{}. The heat ofcombustion at constant pressure is
Answer» The heat of combustion of solid benzoic acid at constant volume is -321.3 kJ at 27^{}. The heat ofcombustion at constant pressure is

Discussion

3905.	Which one is harder graphite or diamond
Answer» Which one is harder graphite or diamond

Discussion

3906.	Question 28Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.
Answer» Question 28 Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.

Discussion

3907.	How are the less reactive metals extracted?
Answer» How are the less reactive metals extracted?

Discussion

3908.	What are the characteristics of natural gas?
Answer» What are the characteristics of natural gas?

Discussion

3909.	Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?
Answer» Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?

Discussion

3910.	100 mL each of coconut oil and water are taken in two beakers and kept in the freezer.a) What difference can be observed in their volumes during freezing?b) What do you infer from the observation?c) When water is frozen in glass bottles, it is advised not to fill the bottles completely. Explain the reason.
Answer» 100 mL each of coconut oil and water are taken in two beakers and kept in the freezer. a) What difference can be observed in their volumes during freezing? b) What do you infer from the observation? c) When water is frozen in glass bottles, it is advised not to fill the bottles completely. Explain the reason.

Discussion

3911.	Which of the following characteristics is associated with gaseous state?
Answer» Which of the following characteristics is associated with gaseous state?

Discussion

3912.	How are colloid, solution, and suspension different from each other?
Answer» How are colloid, solution, and suspension different from each other?

Discussion

3913.	Identify the biodegradable materials from the given options.
Answer» Identify the biodegradable materials from the given options.

Discussion

3914.	90.How does the specific charge of particles of cathode rays independent of nature of gas taken in the discharge tube but particles of anode rays depend
Answer» 90.How does the specific charge of particles of cathode rays independent of nature of gas taken in the discharge tube but particles of anode rays depend

Discussion

3915.	What are the three states of matter? Give examples for each state. [3 MARKS]
Answer» What are the three states of matter? Give examples for each state. [3 MARKS]

Discussion

3916.	What is the properties of matter and there measurement
Answer» What is the properties of matter and there measurement

Discussion

3917.	Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?A. Cu B. AlC. Fe D. Zn
Answer» Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas? A. Cu B. Al C. Fe D. Zn

Discussion

3918.	Match the following. Reaction NamesReactionsiDisplacement reactionA.CaO+O2→2Ca(OH)2iiDecomposition ReactionB.Fe+Pb(NO3)2→Fe(NO3)2+PbiiiRedox ReactionC.MgCl2+Ca(OH)2→Mg(OH)2+CaCl2ivCombination ReactionD.KClO3→2KCl+3O2vDouble Displacement ReactionE.CO2+H2→2CO+H2O
Answer» Match the following. $\begin{matrix} R e a c t i o n N a m e s & R e a c t i o n s i & D i s p l a c e m e n t r e a c t i o n & A . C a O + O_{2} \to 2 C a (O H)_{2} i i & D e c o m p o s i t i o n R e a c t i o n & B . F e + P b (N O_{3})_{2} \to F e (N O_{3})_{2} + P b i i i & R e d o x R e a c t i o n & C . M g C l_{2} + C a (O H)_{2} \to M g (O H)_{2} + C a C l_{2} i v & C o m b i n a t i o n R e a c t i o n & D . K C l O_{3} \to 2 K C l + 3 O_{2} v & D o u b l e D i s p l a c e m e n t R e a c t i o n & E . C O_{2} + H_{2} \to 2 C O + H_{2} O \end{matrix}$

Discussion

3919.	During a physical change or a chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states this?
Answer» During a physical change or a chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states this?

Discussion

3920.	Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.Write down word equations of all the reactions taking place in this process.
Answer» Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. Write down word equations of all the reactions taking place in this process.

Discussion

3921.	'दरबार' सवैये में किस प्रकार के वातावरण का वर्णन किया गया है?
Answer» 'दरबार' सवैये में किस प्रकार के वातावरण का वर्णन किया गया है?

Discussion

3922.	The equivalent weight of oxygen, when it is converted to oxide is equal to
Answer» The equivalent weight of oxygen, when it is converted to oxide is equal to

Discussion

3923.	In chlorine, when the protons and electrons are equal, the charges cancel each other and the atom remains neutral. Then how does it accept one more electron when there is no force to act on it?
Answer» In chlorine, when the protons and electrons are equal, the charges cancel each other and the atom remains neutral. Then how does it accept one more electron when there is no force to act on it?

Discussion

3924.	29. atom a, b, c and d are located at center, face center,Tetrahedra voids,octahedral voids if the minimum distance of an atom b, c and d from atom a are x,y,z respectively then x:y:z is equal to
Answer» 29. atom a, b, c and d are located at center, face center,Tetrahedra voids,octahedral voids if the minimum distance of an atom b, c and d from atom a are x,y,z respectively then x:y:z is equal to

Discussion

3925.	Question 23 Find out the wrong statements and write them in their correct form. (i) We can survive for some time without air but we cannot survive even for a few minutes without food. (ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution. (iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel. (iv) Chlorination is a commonly used chemical method for killing germs in water. (v) Water which is suitable for drinking is called soft water.
Answer» Question 23 Find out the wrong statements and write them in their correct form. (i) We can survive for some time without air but we cannot survive even for a few minutes without food. (ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution. (iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel. (iv) Chlorination is a commonly used chemical method for killing germs in water. (v) Water which is suitable for drinking is called soft water.

Discussion

3926.	Calcium hydroxide + Carbon dioxide → Calcium carbonate + WaterThe balanced chemical equation for the following word equation is:
Answer» Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water The balanced chemical equation for the following word equation is:

Discussion

3927.	The diagram represents the zones of flame, which zone will produce maximum soot?
Answer» The diagram represents the zones of flame, which zone will produce maximum soot?

Discussion

3928.	What is the weight of available oxygen from a solution of H2O2 , if 20 ml of this solution needs 25 ml , N/20 KMnO4 for complete oxidation?
Answer» What is the weight of available oxygen from a solution of H2O2 , if 20 ml of this solution needs 25 ml , N/20 KMnO4 for complete oxidation?

Discussion

3929.	A neutral atom of an element has 2K, 8L, 11 Mand 2N electrons. The number of p-electron in the atom are (1) 2 (2) 12 (3) 10(4) 6
Answer» A neutral atom of an element has 2K, 8L, 11 Mand 2N electrons. The number of p-electron in the atom are (1) 2 (2) 12 (3) 10(4) 6

Discussion

3930.	Which of the following interhalogen compound is/are solid in nature?
Answer» Which of the following interhalogen compound is/are solid in nature?

Discussion

3931.	What is electron configuration and how to find it in simple words ?
Answer» What is electron configuration and how to find it in simple words ?

Discussion

3932.	Calculate the volume occupied by (0) 28 u nitrogen gas (i) 28 g N2 gas at STP.
Answer» Calculate the volume occupied by (0) 28 u nitrogen gas (i) 28 g N2 gas at STP.

Discussion

3933.	Fractures in oil reservoirs ___
Answer» Fractures in oil reservoirs ___

Discussion

3934.	25.the half life of A is10.6min. it undergoes decay to its daughter element B of half life 60.58s .the time which the daugter element will have maximum activity a 22.71s b 227.1s c 227.1 min d 22.71 min
Answer» 25.the half life of A is10.6min. it undergoes decay to its daughter element B of half life 60.58s .the time which the daugter element will have maximum activity a 22.71s b 227.1s c 227.1 min d 22.71 min

Discussion

3935.	The measures to be taken to keep public places clean and free from plastic are:
Answer» The measures to be taken to keep public places clean and free from plastic are:

Discussion

3936.	Amongst the reactant pairs given below, how many of them yield no product?(a) Mg(s)+CuSO4(aq)(b) Cu(s)+ZnSO4(aq)(c) Zn(s)+HCl(aq)1
Answer» Amongst the reactant pairs given below, how many of them yield no product? $(a) M g (s) + C u S O_{4} (a q)$ $(b) C u (s) + Z n S O_{4} (a q)$ $(c) Z n (s) + H C l (a q)$ 1

Discussion

3937.	How can we briefly describe atomic mass?
Answer» How can we briefly describe atomic mass?

Discussion

3938.	Define atomicity.
Answer» Define atomicity.

Discussion

3939.	Question 5 (b)Give reason.LPG is a better domestic fuel than wood.
Answer» Question 5 (b) Give reason. LPG is a better domestic fuel than wood.

Discussion

3940.	Explain about coal and petroleum from basics
Answer» Explain about coal and petroleum from basics

Discussion

3941.	What is the observation of discovery of electron
Answer» What is the observation of discovery of electron

Discussion

3942.	MnO4 ^{- }+ H^{+ }+ C_2O_4^{2- }→ Mn^{2+ }+ co_{2 + }H_2O the moles of CO_{2 } + H_2O, the moles of CO_{2 }formed ar
Answer» MnO4 ^{- }+ H^{+ }+ C_2O_4^{2- }→ Mn^{2+ }+ co_{2 + }H_2O the moles of CO_{2 } + H_2O, the moles of CO_{2 }formed ar

Discussion

3943.	MnO2 (s)+4HCl(aq)→MnCl2(aq)+Cl2(g)+2H2O(l) In the above reaction, which one of them is getting reduced?
Answer» ${MnO}_{2} (s) + 4 HCl(aq) \to {MnCl}_{2} (aq) + {Cl}_{2} (g) + 2 H_{2} O(l)$ In the above reaction, which one of them is getting reduced?

Discussion

3944.	Which of following produce gas? 1.CuSo4 and Zn 2.HCl and Zn 3.CuSo4 and Fe 4.NaOH and Al
Answer» Which of following produce gas? 1.CuSo4 and Zn 2.HCl and Zn 3.CuSo4 and Fe 4.NaOH and Al

Discussion

3945.	Which of the following burns without producing a flame ? (a) camphor (b) coke (c) cooking gas (d) kerosene
Answer» Which of the following burns without producing a flame ? (a) camphor (b) coke (c) cooking gas (d) kerosene

3945.

Which of the following burns without producing a flame ? (a) camphor (b) coke (c) cooking gas (d) kerosene

Answer»

Which of the following burns without producing a flame ?

(a) camphor

(b) coke

(c) cooking gas

(d) kerosene

Discussion

3946.	Question 6 (d)Give reasons for the following.Why Sodium and potassium are stored in kerosene?
Answer» Question 6 (d) Give reasons for the following. Why Sodium and potassium are stored in kerosene?

Discussion

3947.	Question 6What is fuel? Give two examples each of solid, liquid, and gaseous fuels.
Answer» Question 6 What is fuel? Give two examples each of solid, liquid, and gaseous fuels.

3947.

Question 6What is fuel? Give two examples each of solid, liquid, and gaseous fuels.

Answer»

Question 6

What is fuel? Give two examples each of solid, liquid, and gaseous fuels.

Discussion

3948.	Which of the following is an example of double displacement reaction?(i) CO2(g)+H2(g)→CO(g)+H2O(g)(ii) P4O10(s)+6H2O(l)→4H3PO4(aq)(iii) H2+O2→H2O(iv) CoCl2(aq)+Na2CO3(aq)→CoCO3(aq)+2NaCl(aq)
Answer» Which of the following is an example of double displacement reaction? (i) $C O_{2} (g) + H_{2} (g) \to C O (g) + H_{2} O (g)$ (ii) $P_{4} O_{10} (s) + 6 H_{2} O (l) \to 4 H_{3} P O_{4} (a q)$ (iii) $H_{2} + O_{2} \to H_{2} O$ (iv) $C o C l_{2} (a q) + N a_{2} C O_{3} (a q) \to C o C O_{3} (a q) + 2 N a C l (a q)$

Discussion

3949.	62 Atomic radius order for F-,Cl-,Br-,H-
Answer» 62 Atomic radius order for F-,Cl-,Br-,H-

Discussion

3950.	What is atom ??
Answer» What is atom ??

Discussion

Explore topic-wise InterviewSolutions in .

Petrochemicals are not used in the manufacture of

At STP, a container has 3 moles of He, 3 moles of O2 and 4 moles N2. Without changing total pressure, if 2 moles of O2 is removed, the partial pressure of O2 will be decreased by:

Why zinc have high lionisation energy

The heat of combustion of solid benzoic acid at constant volume is -321.3 kJ at 27^{}. The heat ofcombustion at constant pressure is

Which one is harder graphite or diamond

Question 28Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.

How are the less reactive metals extracted?

What are the characteristics of natural gas?

Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?​

Which of the following characteristics is associated with gaseous state?

How are colloid, solution, and suspension different from each other?

Identify the biodegradable materials from the given options.

90.How does the specific charge of particles of cathode rays independent of nature of gas taken in the discharge tube but particles of anode rays depend

What are the three states of matter? Give examples for each state. [3 MARKS]

What is the properties of matter and there measurement

Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?A. Cu B. AlC. Fe D. Zn

Match the following. Reaction NamesReactionsiDisplacement reactionA.CaO+O2→2Ca(OH)2iiDecomposition ReactionB.Fe+Pb(NO3)2→Fe(NO3)2+PbiiiRedox ReactionC.MgCl2+Ca(OH)2→Mg(OH)2+CaCl2ivCombination ReactionD.KClO3→2KCl+3O2vDouble Displacement ReactionE.CO2+H2→2CO+H2O

During a physical change or a chemical change, the total mass of the products remains equal to the total mass of reactants. Which of the following law states this?

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.Write down word equations of all the reactions taking place in this process.

'दरबार' सवैये में किस प्रकार के वातावरण का वर्णन किया गया है?

The equivalent weight of oxygen, when it is converted to oxide is equal to

In chlorine, when the protons and electrons are equal, the charges cancel each other and the atom remains neutral. Then how does it accept one more electron when there is no force to act on it?

29. atom a, b, c and d are located at center, face center,Tetrahedra voids,octahedral voids if the minimum distance of an atom b, c and d from atom a are x,y,z respectively then x:y:z is equal to

Calcium hydroxide + Carbon dioxide → Calcium carbonate + WaterThe balanced chemical equation for the following word equation is:

The diagram represents the zones of flame, which zone will produce maximum soot?

What is the weight of available oxygen from a solution of H2O2 , if 20 ml of this solution needs 25 ml , N/20 KMnO4 for complete oxidation?

A neutral atom of an element has 2K, 8L, 11 Mand 2N electrons. The number of p-electron in the atom are (1) 2 (2) 12 (3) 10(4) 6

Which of the following interhalogen compound is/are solid in nature?

What is electron configuration and how to find it in simple words ?

Calculate the volume occupied by (0) 28 u nitrogen gas (i) 28 g N2 gas at STP.

Fractures in oil reservoirs ___

25.the half life of A is10.6min. it undergoes decay to its daughter element B of half life 60.58s .the time which the daugter element will have maximum activity a 22.71s b 227.1s c 227.1 min d 22.71 min

The measures to be taken to keep public places clean and free from plastic are:

Amongst the reactant pairs given below, how many of them yield no product?(a) Mg(s)+CuSO4(aq)(b) Cu(s)+ZnSO4(aq)(c) Zn(s)+HCl(aq)1

How can we briefly describe atomic mass?

Define atomicity.

Question 5 (b)Give reason.LPG is a better domestic fuel than wood.

Explain about coal and petroleum from basics

What is the observation of discovery of electron

MnO4 ^{- }+ H^{+ }+ C_2O_4^{2- }→ Mn^{2+ }+ co_{2 + }H_2O the moles of CO_{2 } + H_2O, the moles of CO_{2 }formed ar

MnO2 (s)+4HCl(aq)→MnCl2(aq)+Cl2(g)+2H2O(l) In the above reaction, which one of them is getting reduced?

Which of following produce gas? 1.CuSo​​​​4 and Zn 2.HCl and Zn 3.CuSo4 and Fe 4.​​​​NaOH and Al

Which of the following burns without producing a flame ? (a) camphor (b) coke (c) cooking gas (d) kerosene

Question 6 (d)Give reasons for the following.Why Sodium and potassium are stored in kerosene?

Question 6What is fuel? Give two examples each of solid, liquid, and gaseous fuels.

Which of the following is an example of double displacement reaction?(i) CO2(g)+H2(g)→CO(g)+H2O(g)(ii) P4O10(s)+6H2O(l)→4H3PO4(aq)(iii) H2+O2→H2O​​​​​​​(iv) CoCl2(aq)+Na2CO3(aq)→CoCO3(aq)+2NaCl(aq)​​​​​​​

62 Atomic radius order for F-,Cl-,Br-,H-

What is atom ??

Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?

Which of following produce gas? 1.CuSo4 and Zn 2.HCl and Zn 3.CuSo4 and Fe 4.NaOH and Al

Which of the following is an example of double displacement reaction?(i) CO2(g)+H2(g)→CO(g)+H2O(g)(ii) P4O10(s)+6H2O(l)→4H3PO4(aq)(iii) H2+O2→H2O(iv) CoCl2(aq)+Na2CO3(aq)→CoCO3(aq)+2NaCl(aq)