10223 + Interview Questions in Chemistry Page 140 InterviewSolution

6951.	21.5 gram of sodium chloride dissolves in 60 gram of water at 25 degree celcius temperature . Calculate the solubility of sodium chloride in water at that temperature?
Answer» 21.5 gram of sodium chloride dissolves in 60 gram of water at 25 degree celcius temperature . Calculate the solubility of sodium chloride in water at that temperature?

Discussion

6952.	From the symbol 42He for the element helium, write down the mass number and the atomic number of the element.
Answer» From the symbol $_{2}^{4} H e$ for the element helium, write down the mass number and the atomic number of the element.

Discussion

6953.	What are different categories of pure substance?
Answer» What are different categories of pure substance?

Discussion

6954.	According to the scientist Dalton, the element that has the following symbol for representation is ___
Answer» According to the scientist Dalton, the element that has the following symbol for representation is ___

Discussion

6955.	When ice is changed into water and then to water vapour then where does the heat will go if more heat is applied to it?
Answer» When ice is changed into water and then to water vapour then where does the heat will go if more heat is applied to it?

Discussion

6956.	A compound X having 2 molecules of water of crystallization.On heating, it becomes a new compound Y used in plastering of fractured bones.The compound X is ___ .
Answer» A compound X having 2 molecules of water of crystallization.On heating, it becomes a new compound Y used in plastering of fractured bones.The compound X is ___ .

Discussion

6957.	Which of the following information is conveyed by chemical reaction?
Answer» Which of the following information is conveyed by chemical reaction?

Discussion

6958.	Why in the formula f=kma k is a constant? How it is derived
Answer» Why in the formula f=kma k is a constant? How it is derived

Discussion

6959.	Suspensions and collids short definition...
Answer» Suspensions and collids short definition...

Discussion

6960.	For any substance, why the temperature remain constant during change in state?
Answer» For any substance, why the temperature remain constant during change in state?

Discussion

6961.	What is mole concept?
Answer» What is mole concept?

Discussion

6962.	What is a substance ice water and steam are three states of a substance and not different substances justified
Answer» What is a substance ice water and steam are three states of a substance and not different substances justified

Discussion

6963.	what is change of state of matter
Answer» what is change of state of matter

Discussion

6964.	In the series ethane, ethylene and acetylene, the C-H bond energy is
Answer» In the series ethane, ethylene and acetylene, the C-H bond energy is

6964.

In the series ethane, ethylene and acetylene, the C-H bond energy is

Answer»

In the series ethane, ethylene and acetylene, the C-H bond energy is

Discussion

6965.	3.011×1023 molecules of a gas weigh 14 g. Calculate the molecular mass of the gas.
Answer» $3.011 \times 10^{23}$ molecules of a gas weigh $14 g$ . Calculate the molecular mass of the gas.

Discussion

6966.	Why acid rain effects the environment? What are the sideffects of acid rain?
Answer» Why acid rain effects the environment? What are the sideffects of acid rain?

Discussion

6967.	What is blue and green vitriol.Write it's chemical name and somw uses
Answer» What is blue and green vitriol.Write it's chemical name and somw uses

Discussion

6968.	Why do we call sugar a pure substance
Answer» Why do we call sugar a pure substance

Discussion

6969.	There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency, as well as electrovalency, will be : (a) P (b) Q (c) R (d) S
Answer» There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency, as well as electrovalency, will be : (a) P (b) Q (c) R (d) S

6969.

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency, as well as electrovalency, will be : (a) P (b) Q (c) R (d) S

Answer»

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency, as well as electrovalency, will be :

(a) P

(b) Q

(c) R

(d) S

Discussion

6970.	The molecular formula of a compound is C2X6 . X is unknown.If the mass ratio of C to X is 4:1. Find X
Answer» The molecular formula of a compound is $C_{2} X_{6}$ . X is unknown.If the mass ratio of C to X is 4:1. Find X

Discussion

6971.	Solids are generally non compressible why can sponge be readily compressed?
Answer» Solids are generally non compressible why can sponge be readily compressed?

Discussion

6972.	Allotropes of Carbon has different chemical and physical properties. Why is that?
Answer» Allotropes of Carbon has different chemical and physical properties. Why is that?

Discussion

6973.	Use the graph given to answer the following question. Amount of Sugar That Will Dissolve in 4 cups of Water at Different Temperatures What conclusion can be drawn from the graphs?
Answer» Use the graph given to answer the following question. Amount of Sugar That Will Dissolve in 4 cups of Water at Different Temperatures What conclusion can be drawn from the graphs?

Discussion

6974.	Which of the oxides is not mixed oxide?
Answer» Which of the oxides is not mixed oxide?

Discussion

6975.	Which statement/s about the manufacture of Ammonia by the Haber Process is/are correct?
Answer» Which statement/s about the manufacture of Ammonia by the Haber Process is/are correct?

Discussion

6976.	Ornaments : Gold : : Needle : ?
Answer» Ornaments : Gold : : Needle : ?

Discussion

6977.	What is the difference between these symbols and what information they carry Cl, Cl- , (Cl)2
Answer» What is the difference between these symbols and what information they carry Cl, Cl- , (Cl)2

6977.

What is the difference between these symbols and what information they carry Cl, Cl- , (Cl)2

Answer»

What is the difference between these symbols and what information they carry

Cl, Cl- , (Cl)2

Discussion

6978.	Which of the following statements are correct about SF4?
Answer» Which of the following statements are correct about $S F_{4}$ ?

Discussion

6979.	(a) What are the cathode rays? What is the nature of charge on cathode rays? (b) Explain how cathode rays are formed from the gas taken in the discharge tube. (c) What conclusion is obtained from the fact that all the gases form cathode rays?
Answer» (a) What are the cathode rays? What is the nature of charge on cathode rays? (b) Explain how cathode rays are formed from the gas taken in the discharge tube. (c) What conclusion is obtained from the fact that all the gases form cathode rays?

Discussion

6980.	According to the kinetic theory of gases, the effect of an increase in temperature on the distribution of molecular speeds is that
Answer» According to the kinetic theory of gases, the effect of an increase in temperature on the distribution of molecular speeds is that

Discussion

6981.	Which of the following pairs has almost same colour?
Answer» Which of the following pairs has almost same colour?

Discussion

6982.	In a Galvanic cell, what happens when current is passed through the solution of an electrolyte?
Answer» In a Galvanic cell, what happens when current is passed through the solution of an electrolyte?

Discussion

6983.	Equation H2S+H2O2→S+2H2O Here H2O2 acts as an ___ agent.
Answer» Equation $H_{2} S + H_{2} O_{2} \to S + 2 H_{2} O$ Here $H_{2} O_{2}$ acts as an ___ agent.

Discussion

6984.	Which of the following is/are true for carbon monoxide?
Answer» Which of the following is/are true for carbon monoxide?

Discussion

6985.	Thomson proposed the model of an atom to be similar to that of a:
Answer» Thomson proposed the model of an atom to be similar to that of a:

Discussion

6986.	Buna-s is a polymer of
Answer» Buna-s is a polymer of

Discussion

6987.	Give two example from everyday life situations where redox reactions are taking place. [2 MARKS]
Answer» Give two example from everyday life situations where redox reactions are taking place. [2 MARKS]

Discussion

6988.	Which of the following represents the correct composition of air by volume?
Answer» Which of the following represents the correct composition of air by volume?

Discussion

6989.	Write three states of matter in increasing order of particle motion.
Answer» Write three states of matter in increasing order of particle motion.

Discussion

6990.	While testing an LED, it is advised not to close the circuit for a long time. The reason for this is:
Answer» While testing an LED, it is advised not to close the circuit for a long time. The reason for this is:

Discussion

6991.	A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy of a single photon in this light?
Answer» A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy of a single photon in this light?

Discussion

6992.	Half - lives of decomposition of NH3 on the surface of a catalyst for different initial pressures are given as : p(torr) 200 300 500 t1.2(min) 10 15 25 The order of the reaction is :
Answer» Half - lives of decomposition of $N H_{3}$ on the surface of a catalyst for different initial pressures are given as : p(torr) 200 300 500 $t_{1.2 (m i n)}$ 10 15 25 The order of the reaction is :

Discussion

6993.	In the fractional distillation of air, which component of air gets separated as dry ice?
Answer» In the fractional distillation of air, which component of air gets separated as dry ice?

Discussion

6994.	Which of the following substances is not combustible?
Answer» Which of the following substances is not combustible?

Discussion

6995.	Option 15 Stainless steel is very useful material for our life. In stainless steel, iron is mixed with (a) Ni and Cr (b) Cu and Cr (c) Ni and Cu (d) Cu and Au
Answer» Option 15 Stainless steel is very useful material for our life. In stainless steel, iron is mixed with (a) $Ni$ and $Cr$ (b) $Cu$ and $Cr$ (c) $Ni$ and $Cu$ (d) $Cu$ and $Au$

Discussion

6996.	Question 10 If bromine atom is available in the form of, say, two isotopes 7935Br (49.7%) and 8135Br(50.3%), calculate the average atomic mass of bromine atom.
Answer» Question 10 If bromine atom is available in the form of, say, two isotopes $_{35}^{79}$ Br (49.7%) and $_{35}^{81}$ Br(50.3%), calculate the average atomic mass of bromine atom.

Discussion

6997.	The name for the compound whose image is given below is
Answer» The name for the compound whose image is given below is

6997.

The name for the compound whose image is given below is

Answer»

The name for the compound whose image is given below is

Discussion

6998.	Under normal conditions, for the reaction SO3(g)+H2O(l)→H2SO4(aq) the nature of ΔH is:
Answer» Under normal conditions, for the reaction $S O_{3} (g) + H_{2} O (l) \to H_{2} S O_{4} (a q)$ the nature of $Δ$ H is:

Discussion

6999.	The least metallic element among the following is:
Answer» The least metallic element among the following is:

Discussion

7000.	What is the type of chemical bond is present in a calcium fluoride molecule?
Answer» What is the type of chemical bond is present in a calcium fluoride molecule?

Discussion

Explore topic-wise InterviewSolutions in .

21.5 gram of sodium chloride dissolves in 60 gram of water at 25 degree celcius temperature . Calculate the solubility of sodium chloride in water at that temperature?

From the symbol 42He for the element helium, write down the mass number and the atomic number of the element.

What are different categories of pure substance?

According to the scientist Dalton, the element that has the following symbol for representation is ___

When ice is changed into water and then to water vapour then where does the heat will go if more heat is applied to it? ​​​​​​

A compound X having 2 molecules of water of crystallization.On heating, it becomes a new compound Y used in plastering of fractured bones.The compound X is ___ .

Which of the following information is conveyed by chemical reaction?

Why in the formula f=kma k is a constant? How it is derived

Suspensions and collids short definition...

For any substance, why the temperature remain constant during change in state?

What is mole concept?

What is a substance ice water and steam are three states of a substance and not different substances justified

what is change of state of matter

In the series ethane, ethylene and acetylene, the C-H bond energy is

3.011×1023 molecules of a gas weigh 14 g. Calculate the molecular mass of the gas.

Why acid rain effects the environment? What are the sideffects of acid rain?

What is blue and green vitriol.Write it's chemical name and somw uses

Why do we call sugar a pure substance

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency, as well as electrovalency, will be : (a) P (b) Q (c) R (d) S

The molecular formula of a compound is C2X6 . X is unknown.If the mass ratio of C to X is 4:1. Find X

Solids are generally non compressible why can sponge be readily compressed?

Allotropes of Carbon has different chemical and physical properties. Why is that?

Use the graph given to answer the following question. Amount of Sugar That Will Dissolve in 4 cups of Water at Different Temperatures What conclusion can be drawn from the graphs?

Which of the oxides is not mixed oxide?

Which statement/s about the manufacture of Ammonia by the Haber Process is/are correct?

Ornaments : Gold : : Needle : ?

What is the difference between these symbols and what information they carry Cl, Cl- , (Cl)2

Which of the following statements are correct about SF4?

(a) What are the cathode rays? What is the nature of charge on cathode rays? (b) Explain how cathode rays are formed from the gas taken in the discharge tube. (c) What conclusion is obtained from the fact that all the gases form cathode rays?

According to the kinetic theory of gases, the effect of an increase in temperature on the distribution of molecular speeds is that

Which of the following pairs has almost same colour?

In a Galvanic cell, what happens when current is passed through the solution of an electrolyte?

Equation H2S+H2O2→S+2H2O Here H2O2 acts as an ___ agent.

Which of the following is/are true for carbon monoxide?

Thomson proposed the model of an atom to be similar to that of a:

Buna-s is a polymer of

Give two example from everyday life situations where redox reactions are taking place. [2 MARKS]

Which of the following represents the correct composition of air by volume?

Write three states of matter in increasing order of particle motion.

While testing an LED, it is advised not to close the circuit for a long time. The reason for this is:

A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy of a single photon in this light?

Half - lives of decomposition of NH3 on the surface of a catalyst for different initial pressures are given as : p(torr) 200 300 500 t1.2(min) 10 15 25 The order of the reaction is :

In the fractional distillation of air, which component of air gets separated as dry ice?

Which of the following substances is not combustible?

Option 15 Stainless steel is very useful material for our life. In stainless steel, iron is mixed with (a) Ni and Cr (b) Cu and Cr (c) Ni and Cu (d) Cu and Au

Question 10 If bromine atom is available in the form of, say, two isotopes 7935Br (49.7%) and 8135Br(50.3%), calculate the average atomic mass of bromine atom.

The name for the compound whose image is given below is

Under normal conditions, for the reaction SO3(g)+H2O(l)→H2SO4(aq) the nature of ΔH is:

The least metallic element among the following is:

What is the type of chemical bond is present in a calcium fluoride molecule?

When ice is changed into water and then to water vapour then where does the heat will go if more heat is applied to it?