7248 + Interview Questions in Chemistry Page 23 InterviewSolution

1101.	What is the most abundant element in the universe by mass?
Answer» What is the most abundant element in the universe by mass?

Discussion

1102.	Why we take 10+3 to check the position of p -block elements.
Answer» Why we take 10+3 to check the position of p -block elements.

Discussion

1103.	Making the maghesiuno66ig oriWhich of the following metal do not evolve H, gas from dil. acid?(2) B (E 0.22 V)AEAIA0.25B/B(4) D ED0.44V0.30 VD/Dare respectively +0.5and Fo
Answer» Making the maghesiuno66ig oriWhich of the following metal do not evolve H, gas from dil. acid?(2) B (E 0.22 V)AEAIA0.25B/B(4) D ED0.44V0.30 VD/Dare respectively +0.5and Fo

Discussion

1104.	Complete the Table on the basis of information available in the symbols given below.(a) 357Cl(b) 126C(c) 8135Br
Answer» Complete the Table on the basis of information available in the symbols given below. (a) $_{7}^{35} C l$ (b) $_{6}^{12} C$ (c) $_{35}^{81} B r$

Discussion

1105.	What is the entropy of super cooled liquids at zero Kelvin
Answer» What is the entropy of super cooled liquids at zero Kelvin

Discussion

1106.	if brass an alloy of zinc and copper is to be react with dilute H2SO4 then will only zinc react with it , not copper or the Zn and Cu will not show their propety?
Answer» if brass an alloy of zinc and copper is to be react with dilute H2SO4 then will only zinc react with it , not copper or the Zn and Cu will not show their propety?

Discussion

1107.	Remplissez les tirets selon le sens.
Answer» Remplissez les tirets selon le sens.

Discussion

1108.	Define mixture. What are the types of mixtures? Give one example of each type of mixture.
Answer» Define mixture. What are the types of mixtures? Give one example of each type of mixture.

Discussion

1109.	In a reaction between a metal and an acid, why are bubbles formed?
Answer» In a reaction between a metal and an acid, why are bubbles formed?

Discussion

1110.	Under which different types can the following changes be classified?(a) Conversion of milk into yoghurt.(b) Bursting of a cracker.(c) Occurence of an earthquake.(d) Revolution of the earth around the sun.(e) Stretching of a spring.
Answer» Under which different types can the following changes be classified? (a) Conversion of milk into yoghurt. (b) Bursting of a cracker. (c) Occurence of an earthquake. (d) Revolution of the earth around the sun. (e) Stretching of a spring.

Discussion

1111.	Question 4 Give the classification of changes based upon the chemical composition of a substance. Name the change in which the composition of a substance is not altered and no new substance is formed. Based on your answer in (b), give two or three examples of it. Choose the correct characteristic/s about the physical change: Characteristic 1: properties of a substance change.Characteristic 2: physical changes are reversible in nature.
Answer» Question 4 Give the classification of changes based upon the chemical composition of a substance. Name the change in which the composition of a substance is not altered and no new substance is formed. Based on your answer in (b), give two or three examples of it. Choose the correct characteristic/s about the physical change: Characteristic 1: properties of a substance change. Characteristic 2: physical changes are reversible in nature.

1111.

Question 4 Give the classification of changes based upon the chemical composition of a substance. Name the change in which the composition of a substance is not altered and no new substance is formed. Based on your answer in (b), give two or three examples of it. Choose the correct characteristic/s about the physical change: Characteristic 1: properties of a substance change.Characteristic 2: physical changes are reversible in nature.

Answer»

Question 4

Give the classification of changes based upon the chemical composition of a substance.

Name the change in which the composition of a substance is not altered and no new substance is formed.

Based on your answer in (b), give two or three examples of it.

Choose the correct characteristic/s about the physical change:

Characteristic 1: properties of a substance change.

Characteristic 2: physical changes are reversible in nature.

Discussion

1112.	Why is air positively charged and the water droplets negatively charged in the cloud?
Answer» Why is air positively charged and the water droplets negatively charged in the cloud?

Discussion

1113.	Complétez avec les mots suivants.(parfum, pâte dentifrice, poudre, rasoir, brosse à dents, peigne.)
Answer» Complétez avec les mots suivants. (parfum, pâte dentifrice, poudre, rasoir, brosse à dents, peigne.)

Discussion

1114.	ntin a thermodynamic process on an ideal diatomic gas, work done by gas is n times the heat supplied (n
Answer» ntin a thermodynamic process on an ideal diatomic gas, work done by gas is n times the heat supplied (n<1) find the molar heat capacity of gas for the processn

Discussion

1115.	Is boron, Polonium and astatine metalloids?
Answer» Is boron, Polonium and astatine metalloids?

Discussion

1116.	A fragrance that is sprayed at one end of the room can spread throughout the room by the process of___
Answer» A fragrance that is sprayed at one end of the room can spread throughout the room by the process of___

Discussion

1117.	Which of the following is/are correct:
Answer» Which of the following is/are correct:

Discussion

1118.	((An open container is placed in atmosphere. Duringa time interval, temperature of atmosphereincreases and then decreases. The internal energyof gas in container(1) First increases then decreases becauseinternal energy depends upon temperature(2) First decreases then increasesal gaipns toT o(3) Remains constant(4) Is inversely proportional to temperature
Answer» ((An open container is placed in atmosphere. Duringa time interval, temperature of atmosphereincreases and then decreases. The internal energyof gas in container(1) First increases then decreases becauseinternal energy depends upon temperature(2) First decreases then increasesal gaipns toT o(3) Remains constant(4) Is inversely proportional to temperature

Discussion

1119.	What happens to water if(a) it is kept in a deep freezer ?(b) it is heated ?Explain the phenomenon of change of state of water.
Answer» What happens to water if (a) it is kept in a deep freezer ? (b) it is heated ? Explain the phenomenon of change of state of water.

1119.

What happens to water if(a) it is kept in a deep freezer ?(b) it is heated ?Explain the phenomenon of change of state of water.

Answer»

What happens to water if

(a) it is kept in a deep freezer ?

(b) it is heated ?

Explain the phenomenon of change of state of water.

Discussion

1120.	Coal is found:
Answer» Coal is found:

Discussion

1121.	You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Answer» You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?

Discussion

1122.	A compound is formed when elements X and Y chemically combine with each other. X has a valency of 4 and Y has a valency of 2. The molecular formula of the compound will be _______.
Answer» A compound is formed when elements X and Y chemically combine with each other. X has a valency of 4 and Y has a valency of 2. The molecular formula of the compound will be _______.

Discussion

1123.	The mass ratio of hydrogen to oxygen in water is :
Answer» The mass ratio of hydrogen to oxygen in water is :

Discussion

1124.	The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?
Answer» The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?

Discussion

1125.	Question 14'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.
Answer» Question 14 'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

Discussion

1126.	The reduction potential for Cu2+/Cu is +0.34 V. Calculate the reduction potential (in V) at pH=13 for the above couple (assume saturated solution of Cu(OH)2).(Given: Ksp(Cu(OH)2)=10−22)
Answer» The reduction potential for $C u^{2 +} / C u$ is $+ 0.34 V$ . Calculate the reduction potential $(in V)$ at $p H = 13$ for the above couple $(assume saturated solution of C u (O H)_{2})$ . $(Given: K_{s p} (C u (O H)_{2}) = 10^{- 22}$ $)$

Discussion

1127.	what is oxidising state
Answer» what is oxidising state

Discussion

1128.	Can the molecules of water be seen through a microscope?
Answer» Can the molecules of water be seen through a microscope?

Discussion

1129.

Tick thecorrect answer.(i)Silicon Valley is located in (a) Bangalore (b) California (c) Ahmedabad (ii) Whichone of the following industries is known as sunrise industry? (a) Iron and steel industry (b) Cotton textile (c) Information technology (iii)Which one of the following is a natural fibre? (a) Nylon (b) Jute (c) Acrylic

Answer»

Tick the
correct answer.

(i)
Silicon Valley is located in

(a) Bangalore

(b) California

(c) Ahmedabad

(ii) Which
one of the following industries is known as sunrise industry?

(a) Iron and steel industry

(b) Cotton textile

(c) Information technology

(iii)
Which one of the following is a natural fibre?

(a) Nylon

(b) Jute

(c) Acrylic

Discussion

1130.	18 Which of the statements about the reaction below are incorrect? 2PbO(s)+C(s)→ 2Pb(s)+CO2(g) (a) Lead is getting reduced (b) Carbon Dioxide is getting oxidised (c) Carbon is getting oxidised (d) Lead oxide is getting reduced (i) (a) and (b) (ii) (a) and (c) (iii) (a), (b) and (c) (iv) all the above
Answer» 18 Which of the statements about the reaction below are incorrect? 2PbO(s)+C(s)→ 2Pb(s)+CO2(g) (a) Lead is getting reduced (b) Carbon Dioxide is getting oxidised (c) Carbon is getting oxidised (d) Lead oxide is getting reduced (i) (a) and (b) (ii) (a) and (c) (iii) (a), (b) and (c) (iv) all the above

Discussion

1131.	The sulphurous acid turns _________ litmus paper to _________.
Answer» The sulphurous acid turns _________ litmus paper to _________.

Discussion

1132.	Question 2Explain why Rayon is different from synthetic fibres ?
Answer» Question 2 Explain why Rayon is different from synthetic fibres ?

Discussion

1133.	What do you observe when a little amount of curd is added to a bowl containing warm milk and kept for five hours?
Answer» What do you observe when a little amount of curd is added to a bowl containing warm milk and kept for five hours?

Discussion

1134.	Explain why, the blue colour of copper sulphate solution fades when an iron nail is kept dipped in it. Write chemical equation of the reaction involved. What does this reaction tell us about the relative reactivities of copper and iron?
Answer» Explain why, the blue colour of copper sulphate solution fades when an iron nail is kept dipped in it. Write chemical equation of the reaction involved. What does this reaction tell us about the relative reactivities of copper and iron?

Discussion

1135.	if two charged particles of charge q & Q-q (Q is constant) are kept at a dist. of 1m from each other , the electrostatic force b/w them is max. for q=q°. The value of 1-q°/Q is ? Options -: 1 , 1/2 , 2 , 1/4
Answer» if two charged particles of charge q & Q-q (Q is constant) are kept at a dist. of 1m from each other , the electrostatic force b/w them is max. for q=q°. The value of 1-q°/Q is ? Options -: 1 , 1/2 , 2 , 1/4

Discussion

1136.	5 Atomic radii of fluorine and neon in angstrom units are
Answer» 5 Atomic radii of fluorine and neon in angstrom units are

Discussion

1137.	When a section is subjected to the limiting moment of resistance then the actual stress in steel of a singly reinforced concrete beam of 200 mm width and 400 mm effective depth, with 4 bars of 16 mm diameter of Fe415 steel is ________ N/mm2 [Use M20 grade concrete]343.77
Answer» When a section is subjected to the limiting moment of resistance then the actual stress in steel of a singly reinforced concrete beam of 200 mm width and 400 mm effective depth, with 4 bars of 16 mm diameter of Fe415 steel is ________ $N / m m^{2}$ [Use M20 grade concrete] 343.77

Discussion

1138.	Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water.(a) How would they make salt solutions?(b) Who would be able to prepare saturated solution?
Answer» Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water. (a) How would they make salt solutions? (b) Who would be able to prepare saturated solution?

Discussion

1139.	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» $\begin{matrix} Reaction Names & Reactions i & Displacement reaction & A. C a O + O_{2} \to 2 C a (O H)_{2} ii & Decomposition Reaction & B. F e + P b (N O_{3})_{2} \to F e (N O_{3})_{2} + P b iii & Redox Reaction & C. M g C l_{2} + C a (O H)_{2} \to M g (O H)_{2} + C a C l_{2} iv & Combination Reaction & D. K C l O_{3} \to 2 K C l + 3 O_{2} v & Double Displacement Reaction & E. C O_{2} + H_{2} \to 2 C O + H_{2} O \end{matrix}$

1139.

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»

$\begin{matrix} Reaction Names & Reactions i & Displacement reaction & A. C a O + O_{2} \to 2 C a (O H)_{2} ii & Decomposition Reaction & B. F e + P b (N O_{3})_{2} \to F e (N O_{3})_{2} + P b iii & Redox Reaction & C. M g C l_{2} + C a (O H)_{2} \to M g (O H)_{2} + C a C l_{2} iv & Combination Reaction & D. K C l O_{3} \to 2 K C l + 3 O_{2} v & Double Displacement Reaction & E. C O_{2} + H_{2} \to 2 C O + H_{2} O \end{matrix}$

Discussion

1140.	The dimensional formula of ( u0e0)^-1 is
Answer» The dimensional formula of ( u0e0)^-1 is

Discussion

1141.	Which of the following is a metal?
Answer» Which of the following is a metal?

Discussion

1142.	कहानी के वैकल्पिक शीर्षक सुझाएँ। निम्नलिखित बिंदुओं को ध्यान में रखकर शीर्षक गढ़े जा सकते हैं-• कहानी में बार-बार फाइल जिक्र आया है और अंत में दबे हुए आदमी के जीवन की फाइल पूर्ण होने की बात कही गई है।• सरकारी दफ्तरों की लंबी और विवेकहीन कार्यप्रणाली की ओर बार-बार इशारा किया गया है।• कहानी का मुख्य पात्र उस विवेकहीनता का शिकार हो जाता है।
Answer» कहानी के वैकल्पिक शीर्षक सुझाएँ। निम्नलिखित बिंदुओं को ध्यान में रखकर शीर्षक गढ़े जा सकते हैं- • कहानी में बार-बार फाइल जिक्र आया है और अंत में दबे हुए आदमी के जीवन की फाइल पूर्ण होने की बात कही गई है। • सरकारी दफ्तरों की लंबी और विवेकहीन कार्यप्रणाली की ओर बार-बार इशारा किया गया है। • कहानी का मुख्य पात्र उस विवेकहीनता का शिकार हो जाता है।

Discussion

1143.	Question 8What do you mean by periodic changes?
Answer» Question 8 What do you mean by periodic changes?

1143.

Question 8What do you mean by periodic changes?

Answer»

Question 8

What do you mean by periodic changes?

Discussion

1144.	How does the electronic configuration of an atom related to its position in the modern periodic table?
Answer» How does the electronic configuration of an atom related to its position in the modern periodic table?

Discussion

1145.	Identify the countable noun in the sentence. I layered my toast with a lot of honey and waited for the tea to boil.
Answer» Identify the countable noun in the sentence. I layered my toast with a lot of honey and waited for the tea to boil.

1145.

Identify the countable noun in the sentence. I layered my toast with a lot of honey and waited for the tea to boil.

Answer»

Identify the countable noun in the sentence.

I layered my toast with a lot of honey and waited for the tea to boil.

Discussion

1146.	12.Expain the preparation of Zwitter ions?
Answer» 12.Expain the preparation of Zwitter ions?

Discussion

1147.	Which element has the electronic configuration of 1s22s22p6?
Answer» Which element has the electronic configuration of $1 s^{2} 2 s^{2} 2 p^{6}$ ?

Discussion

1148.	What is the charge of Mg in MgCl2 ?
Answer» What is the charge of Mg in $M g {C l}_{2}$ ?

Discussion

1149.	How can I learn the reactivity series? (Explain the mnemonic of Please Stop Calling me a Zebra)
Answer» How can I learn the reactivity series? (Explain the mnemonic of Please Stop Calling me a Zebra)

Discussion

1150.	Does alkalis are corrosive in nature? Explain.
Answer» Does alkalis are corrosive in nature? Explain.

Discussion

Explore topic-wise InterviewSolutions in .

What is the most abundant element in the universe by mass?

Why we take 10+3 to check the position of p -block elements.

Making the maghesiuno66ig oriWhich of the following metal do not evolve H, gas from dil. acid?(2) B (E 0.22 V)AEAIA0.25B/B(4) D ED0.44V0.30 VD/Dare respectively +0.5and Fo

Complete the Table on the basis of information available in the symbols given below.​(a) 357Cl(b) 126C(c) 8135Br

What is the entropy of super cooled liquids at zero Kelvin

if brass an alloy of zinc and copper is to be react with dilute H2SO4 then will only zinc react with it , not copper or the Zn and Cu will not show their propety?

Remplissez les tirets selon le sens.

Define mixture. What are the types of mixtures? Give one example of each type of mixture.

In a reaction between a metal and an acid, why are bubbles formed?

Under which different types can the following changes be classified?(a) Conversion of milk into yoghurt.(b) Bursting of a cracker.(c) Occurence of an earthquake.(d) Revolution of the earth around the sun.(e) Stretching of a spring.

Why is air positively charged and the water droplets negatively charged in the cloud?

Complétez avec les mots suivants.(parfum, pâte dentifrice, poudre, rasoir, brosse à dents, peigne.)

ntin a thermodynamic process on an ideal diatomic gas, work done by gas is n times the heat supplied (n

Is boron, Polonium and astatine metalloids?

A fragrance that is sprayed at one end of the room can spread throughout the room by the process of___

Which of the following is/are correct:

What happens to water if(a) it is kept in a deep freezer ?(b) it is heated ?Explain the phenomenon of change of state of water.

Coal is found:

You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?

A compound is formed when elements X and Y chemically combine with each other. X has a valency of 4 and Y has a valency of 2. The molecular formula of the compound will be _______.

The mass ratio of hydrogen to oxygen in water is :

The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?​

Question 14'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

The reduction potential for Cu2+/Cu is +0.34 V. Calculate the reduction potential (in V) at pH=13 for the above couple (assume saturated solution of Cu(OH)2).(Given: Ksp(Cu(OH)2)=10−22)

what is oxidising state

Can the molecules of water be seen through a microscope?

The sulphurous acid turns _________ litmus paper to _________.

Question 2Explain why Rayon is different from synthetic fibres ?

What do you observe when a little amount of curd is added to a bowl containing warm milk and kept for five hours?

Explain why, the blue colour of copper sulphate solution fades when an iron nail is kept dipped in it. Write chemical equation of the reaction involved. What does this reaction tell us about the relative reactivities of copper and iron?

if two charged particles of charge q & Q-q (Q is constant) are kept at a dist. of 1m from each other , the electrostatic force b/w them is max. for q=q°. The value of 1-q°/Q is ? Options -: 1 , 1/2 , 2 , 1/4

5 Atomic radii of fluorine and neon in angstrom units are

When a section is subjected to the limiting moment of resistance then the actual stress in steel of a singly reinforced concrete beam of 200 mm width and 400 mm effective depth, with 4 bars of 16 mm diameter of Fe415 steel is ________ N/mm2 [Use M20 grade concrete]343.77

Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water, whereas Mohan was given twenty teaspoons full of salt and half a glass of water.(a) How would they make salt solutions?(b) Who would be able to prepare saturated solution?

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

The dimensional formula of ( u0e0)^-1 is

Which of the following is a metal?

Question 8What do you mean by periodic changes?

How does the electronic configuration of an atom related to its position in the modern periodic table?

Identify the countable noun in the sentence. I layered my toast with a lot of honey and waited for the tea to boil.

12.Expain the preparation of Zwitter ions?

Which element has the electronic configuration of 1s22s22p6?

What is the charge of Mg in MgCl2 ?

How can I learn the reactivity series? (Explain the mnemonic of Please Stop Calling me a Zebra)

Does alkalis are corrosive in nature? Explain.

Complete the Table on the basis of information available in the symbols given below.(a) 357Cl(b) 126C(c) 8135Br

The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?

The sulphurous acid turns _ litmus paper to _.