15280 + Interview Questions in Chemistry Page 280 InterviewSolution

13951.	To separate different fractions in petroleum industry we employ:
Answer» To separate different fractions in petroleum industry we employ:

Discussion

13952.	What pH does pepsin has? How does the stomach maintain such pH? What is another advantage of having such a pH?
Answer» What pH does pepsin has? How does the stomach maintain such pH? What is another advantage of having such a pH?

Discussion

13953.	Mass of 1 atom of Hydrogen is _____
Answer» Mass of 1 atom of Hydrogen is _____

Discussion

13954.	In the given food web, an increase in the population of hawks will not result in:-
Answer» In the given food web, an increase in the population of hawks will not result in:-

13954.

In the given food web, an increase in the population of hawks will not result in:-

Answer»

In the given food web, an increase in the population of hawks will not result in:-

Discussion

13955.	If X displaces Y form its solution. This is known as displacement reaction. What is the other chemical name which you will give for this type of reaction.
Answer» If X displaces Y form its solution. This is known as displacement reaction. What is the other chemical name which you will give for this type of reaction.

Discussion

13956.	Name the allotropic forms of carbon.
Answer» Name the allotropic forms of carbon.

Discussion

13957.	Question 34 Why are detergents better cleansing agents than soaps? Explain.
Answer» Question 34 Why are detergents better cleansing agents than soaps? Explain.

Discussion

13958.	Write the IUPAC name of the compound CH3CH=CH-CH2Br.
Answer» Write the IUPAC name of the compound CH₃CH=CH-CH₂Br.

Discussion

13959.	Hydrogen gas is not evolved when metals react with:
Answer» Hydrogen gas is not evolved when metals react with:

Discussion

13960.	Which of the following is an acid-base reaction and releases a gas that turns lime water milky?
Answer» Which of the following is an acid-base reaction and releases a gas that turns lime water milky?

Discussion

13961.	Oxidation can involve
Answer» Oxidation can involve

Discussion

13962.	Take cold water, normal water and hot water in three test tubes. Drop a small size of magnesium ribbon in each test tube and add one drop of phenolphthalein in each test tube. In which test tube will pink colour appear sharply?
Answer» Take cold water, normal water and hot water in three test tubes. Drop a small size of magnesium ribbon in each test tube and add one drop of phenolphthalein in each test tube. In which test tube will pink colour appear sharply?

Discussion

13963.	After extracting the crude metal from its ore, what should be the next logical step?
Answer» After extracting the crude metal from its ore, what should be the next logical step?

Discussion

13964.	In the reaction where Ethanol reacts with Sodium metal to give Sodium Ethoxide and Hydrogen gas CH3CH2OH+Na→CH3CH2ONa+H2 ethanol behaves like _______.
Answer» In the reaction where Ethanol reacts with Sodium metal to give Sodium Ethoxide and Hydrogen gas $C H_{3} C H_{2} O H + N a \to C H_{3} C H_{2} O N a + H_{2}$ ethanol behaves like _______.

13964.

In the reaction where Ethanol reacts with Sodium metal to give Sodium Ethoxide and Hydrogen gas CH3CH2OH+Na→CH3CH2ONa+H2 ethanol behaves like _______.

Answer»

In the reaction where Ethanol reacts with

Sodium metal to give Sodium Ethoxide

and Hydrogen gas
$C H_{3} C H_{2} O H + N a \to C H_{3} C H_{2} O N a + H_{2}$
ethanol behaves like _______.

Discussion

13965.	The molecules that are sodium salts of long chain carboxylic acids are known as ___.
Answer» The molecules that are sodium salts of long chain carboxylic acids are known as ___.

Discussion

13966.	Which of the following statement is correct with respect to the stability of an atom?
Answer» Which of the following statement is correct with respect to the stability of an atom?

Discussion

13967.	During the refining of an impure metal by electrolysis, the pure metal is a deposited: (a) at cathode (b) On the walls of electrolytic tank (c) at anode (d) at the botton of electrolytic tank
Answer» During the refining of an impure metal by electrolysis, the pure metal is a deposited: (a) at cathode (b) On the walls of electrolytic tank (c) at anode (d) at the botton of electrolytic tank

Discussion

13968.	Give the composition of an alloy called solder. State its one property and one use.
Answer» Give the composition of an alloy called solder. State its one property and one use.

Discussion

13969.	Which of the following molecule has highest bond energy? 1) F- F 2) N-N 3) C-C 4) O-O
Answer» Which of the following molecule has highest bond energy? 1) F- F 2) N-N 3) C-C 4) O-O

Discussion

13970.	Figure 10.2 shows the industrial preparation of nitric acid. [5 MARKS] (a) What is the ratio of the reactants taken in the above process? (b) Name the common name of this process. (c) Name the catalyst used. (d) Why should the gases entering the apparatus be pure? (e) Where do they react? Also, give balanced reactions.
Answer» Figure 10.2 shows the industrial preparation of nitric acid. [5 MARKS] (a) What is the ratio of the reactants taken in the above process? (b) Name the common name of this process. (c) Name the catalyst used. (d) Why should the gases entering the apparatus be pure? (e) Where do they react? Also, give balanced reactions.

Discussion

13971.	Which one of the following metal can be obtained from bauxite?
Answer» Which one of the following metal can be obtained from bauxite?

Discussion

13972.	Element P has atomic number 19.To which group and period, does P belong ? Is it a metal or a non-metal ? Why ?
Answer» Element P has atomic number 19.To which group and period, does P belong ? Is it a metal or a non-metal ? Why ?

Discussion

13973.	(a) What is a chemical reaction ? (b) State the conditions necessary for a chemical change or reaction.
Answer» (a) What is a chemical reaction ? (b) State the conditions necessary for a chemical change or reaction.

13973.

(a) What is a chemical reaction ? (b) State the conditions necessary for a chemical change or reaction.

Answer»

(a) What is a chemical reaction ?

(b) State the conditions necessary for a chemical change or reaction.

Discussion

13974.	Which of the following anion is present in salt A when dil. HCl is added to salt A and heated, carbon dioxide is evolved.
Answer» Which of the following anion is present in salt A when dil. HCl is added to salt A and heated, carbon dioxide is evolved.

Discussion

13975.	What is called physical change and chemical change?give examples for the following?
Answer» What is called physical change and chemical change?give examples for the following?

Discussion

13976.	A student adds 4 mL of acetic acid to a test tube containing 4 mL of distilled water. He then shakes the test tube and leaves it to settle. After about 10 minutes he observes:
Answer» A student adds 4 mL of acetic acid to a test tube containing 4 mL of distilled water. He then shakes the test tube and leaves it to settle. After about 10 minutes he observes:

Discussion

13977.	(a) give an example for a combination reaction thats exothermic.
Answer» (a) give an example for a combination reaction thats exothermic.

Discussion

13978.	Can you please differentiate between ionization energy , ionization enthalpy , electron affinity and electron gain enthalpy
Answer» Can you please differentiate between ionization energy , ionization enthalpy , electron affinity and electron gain enthalpy

Discussion

13979.	A 4.0 L sample of methane gas is collected at 30∘C. Predict the volume of the sample at 0∘C.
Answer» A 4.0 L sample of methane gas is collected at $30^{\circ} C$ . Predict the volume of the sample at $0^{\circ} C$ .

Discussion

13980.	What are noble gases and mettaloids
Answer» What are noble gases and mettaloids

Discussion

13981.	Which one of the following is incorrect with respect to the decomposition process?
Answer» Which one of the following is incorrect with respect to the decomposition process?

Discussion

13982.	What is the difference between valency and oxidation state
Answer» What is the difference between valency and oxidation state

Discussion

13983.	In a reaction A→ products, the rate is doubled when the concentration of A is increased 4 times. If 50% of the reaction occurs in 1414 sec , how long would it takes for the completion of 75% reaction.
Answer» In a reaction $A \to$ products, the rate is doubled when the concentration of A is increased 4 times. If 50% of the reaction occurs in 1414 sec , how long would it takes for the completion of 75% reaction.

Discussion

13984.	How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
Answer» How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?

Discussion

13985.	On going down a main sub-group in the periodic table (example Li to Cs in IA or Be to Ra in IIA), the expected trend of changes in atomic radius is a
Answer» On going down a main sub-group in the periodic table (example Li to Cs in IA or Be to Ra in IIA), the expected trend of changes in atomic radius is a

Discussion

13986.	What happens when burning jet of hydrogen burns in chlorine?
Answer» What happens when burning jet of hydrogen burns in chlorine?

Discussion

13987.	You want to study a decomposition reaction by taking ferrous sulphate crystals in a boiling tube.List two precautions you would follow while doing the experiment.
Answer» You want to study a decomposition reaction by taking ferrous sulphate crystals in a boiling tube.List two precautions you would follow while doing the experiment.

Discussion

13988.	Which of the following salt has a blue colour and why ? CuSO4.5H2O or CuSO4
Answer» Which of the following salt has a blue colour and why ? $C u S O_{4} .5 H_{2} O o r C u S O_{4}$

13988.

Which of the following salt has a blue colour and why ? CuSO4.5H2O or CuSO4

Answer»

Which of the following salt has a blue colour and why ?

$C u S O_{4} .5 H_{2} O o r C u S O_{4}$

Discussion

13989.	A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?
Answer» A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?

Discussion

13990.	Why is mercury commonly stored in iron bottles?
Answer» Why is mercury commonly stored in iron bottles?

Discussion

13991.	The number of moles present in 24 g of carbon is
Answer» The number of moles present in 24 g of carbon is

Discussion

13992.	A substance that is added to the charge in a furnace to remove gangue particles is termed as __.
Answer» A substance that is added to the charge in a furnace to remove gangue particles is termed as __.

Discussion

13993.	The white solid compound A decomposes quite quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained alongwith potassium nitrate solution. Gas C does not burn itself but helps burn other things. (a) What is compound A ? (b) What is compound B (c) What is gas C ? (d) What do you think is the black substance X ? What is its function ? (e) What is the general name of substances like X ?
Answer» The white solid compound A decomposes quite quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained alongwith potassium nitrate solution. Gas C does not burn itself but helps burn other things. (a) What is compound A ? (b) What is compound B (c) What is gas C ? (d) What do you think is the black substance X ? What is its function ? (e) What is the general name of substances like X ?

13993.

The white solid compound A decomposes quite quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained alongwith potassium nitrate solution. Gas C does not burn itself but helps burn other things. (a) What is compound A ? (b) What is compound B (c) What is gas C ? (d) What do you think is the black substance X ? What is its function ? (e) What is the general name of substances like X ?

Answer»

The white solid compound A decomposes quite quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained alongwith potassium nitrate solution. Gas C does not burn itself but helps burn other things.

(a) What is compound A ?

(b) What is compound B

(c) What is gas C ?

(d) What do you think is the black substance X ? What is its function ?

(e) What is the general name of substances like X ?

Discussion

13994.	Identify Arrhenius acids and bases among the following: 1.NaCl2.HCl3.Cu(OH)24.NaOH5.H2SO46.HNO37.KOH
Answer» Identify Arrhenius acids and bases among the following: $\begin{matrix} 1. N a C l & 2. H C l 3. C u {(O H)}_{2} & 4. N a O H 5. H_{2} S O_{4} & 6. H N O_{3} 7. K O H \end{matrix}$

Discussion

13995.	Uses of hydrochloric acid(HCL) other than digestion.
Answer» Uses of hydrochloric acid(HCL) other than digestion.

Discussion

13996.	In a simple electrochemical cell it says that zinc rod dipped in zinc sulphate solution gives zinc+ ion and electrons. How is that zinc reacts with its own salt to give electrons is my question.plz explain. Thanks.
Answer» In a simple electrochemical cell it says that zinc rod dipped in zinc sulphate solution gives zinc+ ion and electrons. How is that zinc reacts with its own salt to give electrons is my question.plz explain. Thanks.

Discussion

13997.	Which one of the following configuration represents a noble gas?
Answer» Which one of the following configuration represents a noble gas?

Discussion

13998.	Total number of elements present in third group of modern periodic table
Answer» Total number of elements present in third group of modern periodic table

Discussion

13999.	If reaction between nitrogen and hydrogen to form ammonia is exothermic, then it will be accompanied by:
Answer» If reaction between nitrogen and hydrogen to form ammonia is exothermic, then it will be accompanied by:

Discussion

14000.	What happens when CO2 is passed through lime water?
Answer» What happens when CO2 is passed through lime water?

Discussion

Explore topic-wise InterviewSolutions in .

To separate different fractions in petroleum industry we employ:

What pH does pepsin has? How does the stomach maintain such pH? What is another advantage of having such a pH?

Mass of 1 atom of Hydrogen is _____

In the given food web, an increase in the population of hawks will not result in:-

If X displaces Y form its solution. This is known as displacement reaction. What is the other chemical name which you will give for this type of reaction.

Name the allotropic forms of carbon.

Question 34 Why are detergents better cleansing agents than soaps? Explain.

Write the IUPAC name of the compound CH3CH=CH-CH2Br.

Hydrogen gas is not evolved when metals react with:

Which of the following is an acid-base reaction and releases a gas that turns lime water milky?

Oxidation can involve

Take cold water, normal water and hot water in three test tubes. Drop a small size of magnesium ribbon in each test tube and add one drop of phenolphthalein in each test tube. In which test tube will pink colour appear sharply?

After extracting the crude metal from its ore, what should be the next logical step?

In the reaction where Ethanol reacts with Sodium metal to give Sodium Ethoxide and Hydrogen gas CH3CH2OH+Na→CH3CH2ONa+H2 ethanol behaves like _______.

The molecules that are sodium salts of long chain carboxylic acids are known as ___.

Which of the following statement is correct with respect to the stability of an atom?

During the refining of an impure metal by electrolysis, the pure metal is a deposited: (a) at cathode (b) On the walls of electrolytic tank (c) at anode (d) at the botton of electrolytic tank

Give the composition of an alloy called solder. State its one property and one use.

Which of the following molecule has highest bond energy? 1) F- F 2) N-N 3) C-C 4) O-O

Which one of the following metal can be obtained from bauxite?

Element P has atomic number 19.To which group and period, does P belong ? Is it a metal or a non-metal ? Why ?

(a) What is a chemical reaction ? (b) State the conditions necessary for a chemical change or reaction.

Which of the following anion is present in salt A when dil. HCl is added to salt A and heated, carbon dioxide is evolved.

What is called physical change and chemical change?give examples for the following?

A student adds 4 mL of acetic acid to a test tube containing 4 mL of distilled water. He then shakes the test tube and leaves it to settle. After about 10 minutes he observes:

(a) give an example for a combination reaction thats exothermic.

Can you please differentiate between ionization energy , ionization enthalpy , electron affinity and electron gain enthalpy

A 4.0 L sample of methane gas is collected at 30∘C. Predict the volume of the sample at 0∘C.

What are noble gases and mettaloids

Which one of the following is incorrect with respect to the decomposition process?

What is the difference between valency and oxidation state

In a reaction A→ products, the rate is doubled when the concentration of A is increased 4 times. If 50% of the reaction occurs in 1414 sec , how long would it takes for the completion of 75% reaction.

How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?

On going down a main sub-group in the periodic table (example Li to Cs in IA or Be to Ra in IIA), the expected trend of changes in atomic radius is a

What happens when burning jet of hydrogen burns in chlorine?

You want to study a decomposition reaction by taking ferrous sulphate crystals in a boiling tube.List two precautions you would follow while doing the experiment.

Which of the following salt has a blue colour and why ? CuSO4.5H2O or CuSO4

A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?

Why is mercury commonly stored in iron bottles?

The number of moles present in 24 g of carbon is

A substance that is added to the charge in a furnace to remove gangue particles is termed as __.

Identify Arrhenius acids and bases among the following: 1.NaCl2.HCl3.Cu(OH)24.NaOH5.H2SO46.HNO37.KOH

Uses of hydrochloric acid(HCL) other than digestion.

In a simple electrochemical cell it says that zinc rod dipped in zinc sulphate solution gives zinc+ ion and electrons. How is that zinc reacts with its own salt to give electrons is my question.plz explain. Thanks.

Which one of the following configuration represents a noble gas?

Total number of elements present in third group of modern periodic table

If reaction between nitrogen and hydrogen to form ammonia is exothermic, then it will be accompanied by:

What happens when CO2 is passed through lime water?