15280 + Interview Questions in Chemistry

1.	State what happen when a concentrated solution of sodium chloride is electrolysed . Explain briefly?
Answer» State what happen when a concentrated solution of sodium chloride is electrolysed . Explain briefly?

Discussion

2.	__ analysis deals with the determination of composition of a mixture.
Answer» __ analysis deals with the determination of composition of a mixture.

Discussion

3.	Question 36 Suggest suitable mechanism(s) for waste management in fertilizer industries.
Answer» Question 36 Suggest suitable mechanism(s) for waste management in fertilizer industries.

Discussion

4.	what are the uses of ketone and aldehyde in everyday life
Answer» what are the uses of ketone and aldehyde in everyday life

Discussion

5.	Why do some equations become unbalanced???
Answer» Why do some equations become unbalanced???

Discussion

6.	(a) What is the general name of all the compounds made up of carbon and hydrogen? (b) Why does carbon form compounds mainly by covalent bonding?
Answer» (a) What is the general name of all the compounds made up of carbon and hydrogen? (b) Why does carbon form compounds mainly by covalent bonding?

Discussion

7.	What can we say about the nature of alcohols when in a solution?
Answer» What can we say about the nature of alcohols when in a solution?

Discussion

8.	In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace?
Answer» In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace?

Discussion

9.	A copper article if exposed to air, develops a green coloured layer of:
Answer» A copper article if exposed to air, develops a green coloured layer of:

Discussion

10.	A sodium cation has different number of electrons from
Answer» A sodium cation has different number of electrons from

Discussion

11.	If a substance increases the rate of reaction, it is termed as a ___ catalyst.
Answer» If a substance increases the rate of reaction, it is termed as a ___ catalyst.

Discussion

12.	In the laboratory preparation of Nitric Acid, state the role of concentrated Sulphuric Acid
Answer» In the laboratory preparation of Nitric Acid, state the role of concentrated Sulphuric Acid

Discussion

13.	Four grams of caustic soda contains : (a) 6.02×1023atoms of it, (b) 4 g atom of sodium, (c) 6.02×1022 molecules (d) 4 moles of NaOH.
Answer» Four grams of caustic soda contains : (a) $6.02 \times 10^{23} a t o m s o f i t,$ (b) 4 g atom of sodium, (c) $6.02 \times 10^{22}$ molecules (d) 4 moles of NaOH.

13.

Four grams of caustic soda contains : (a) 6.02×1023atoms of it, (b) 4 g atom of sodium, (c) 6.02×1022 molecules (d) 4 moles of NaOH.

Answer»

Four grams of caustic soda contains :

(a) $6.02 \times 10^{23} a t o m s o f i t,$
(b) 4 g atom of sodium,
(c) $6.02 \times 10^{22}$ molecules

(d) 4 moles of NaOH.

Discussion

14.	Which of the following is non-metal displacement reaction ?
Answer» Which of the following is non-metal displacement reaction ?

Discussion

15.	In the given arrangement, when electricity is passed through sodium chloride solution, the bulb glows. What does it indicate?
Answer» In the given arrangement, when electricity is passed through sodium chloride solution, the bulb glows. What does it indicate?

15.

In the given arrangement, when electricity is passed through sodium chloride solution, the bulb glows. What does it indicate?

Answer»

In the given arrangement, when electricity is passed through sodium chloride solution, the bulb glows. What does it indicate?

Discussion

16.	Acetic acid reacts with a sodium compound to release a gas which turns lime water milky. What might be the sodium compound?
Answer» Acetic acid reacts with a sodium compound to release a gas which turns lime water milky. What might be the sodium compound?

Discussion

17.	Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.
Answer» Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.

Discussion

18.	Question 40 Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated. Why?
Answer» Question 40 Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with ${HNO}_{3}$ , hydrogen is not liberated. Why?

Discussion

19.	Question 40 Identify the elements with the following property and arrange them in increasing order of their reactivity: (a) An element which is a soft and a reactive metal. (b) The metal which is an important constituent of limestone. (c) The metal which exists in liquid state at room temperature.
Answer» Question 40 Identify the elements with the following property and arrange them in increasing order of their reactivity: (a) An element which is a soft and a reactive metal. (b) The metal which is an important constituent of limestone. (c) The metal which exists in liquid state at room temperature.

19.

Question 40 Identify the elements with the following property and arrange them in increasing order of their reactivity: (a) An element which is a soft and a reactive metal. (b) The metal which is an important constituent of limestone. (c) The metal which exists in liquid state at room temperature.

Answer»

Question 40
Identify the elements with the following property and arrange them in increasing order of their reactivity:

(a) An element which is a soft and a reactive metal.

(b) The metal which is an important constituent of limestone.

(c) The metal which exists in liquid state at room temperature.

Discussion

20.	Which of the following elements does not lose an electron easily? (a) Na (b) F (c) Mg (d) Al
Answer» Which of the following elements does not lose an electron easily? (a) Na (b) F (c) Mg (d) Al

20.

Which of the following elements does not lose an electron easily? (a) Na (b) F (c) Mg (d) Al

Answer»

Which of the following elements does not lose an electron easily?

(a) Na (b) F (c) Mg (d) Al

Discussion

21.	Write the equations for the reaction of Hydrochloric acid with the following: [4 MARKS] a) Bleaching Powder b) Lead Nitrate Solution c) Manganese(IV) Oxide d) Ammonia
Answer» Write the equations for the reaction of Hydrochloric acid with the following: [4 MARKS] a) Bleaching Powder b) Lead Nitrate Solution c) Manganese(IV) Oxide d) Ammonia

Discussion

22.	DEAR SUBJECT EXPERT, Can you please clear my concept about the CHEMICAL PROPERTIES OF METALS AND NON-METALS ???
Answer» DEAR SUBJECT EXPERT, Can you please clear my concept about the CHEMICAL PROPERTIES OF METALS AND NON-METALS ???

Discussion

23.	Is this balanced correctly? 2Al+6HCl=2AlCl3+3H2
Answer» Is this balanced correctly? 2Al+6HCl=2AlCl₃+3H₂

23.

Is this balanced correctly? 2Al+6HCl=2AlCl3+3H2

Answer»

Is this balanced correctly?

2Al+6HCl=2AlCl₃+3H₂

Discussion

24.	Hybridization of OCl-
Answer» Hybridization of OCl-

Discussion

25.	How can we remember periodic table ?
Answer» How can we remember periodic table ?

Discussion

26.	How many moles of NaHCO3 are present in 420 g of NaHCO3?
Answer» How many moles of $N a H C O_{3}$ are present in 420 g of $N a H C O_{3}$ ?

Discussion

27.	Difference between hydroxide ion and hydroxyl ion?
Answer» Difference between hydroxide ion and hydroxyl ion?

Discussion

28.	In a test, Rashi has to write the chemical equation for the formation of Hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?
Answer» In a test, Rashi has to write the chemical equation for the formation of Hydrochloric acid. She wrote $H_{2} + 2 C l \to 2 H C l$ The teacher marked the answer wrong. Why is it so?

Discussion

29.	Find A and B from the following reaction. CH3CH2OH+O2→A+B+Heat and light
Answer» Find A and B from the following reaction. $C H_{3} C H_{2} O H + O_{2} \to A + B + H e a t a n d l i g h t$

Discussion

30.	Write one property of hydrogen which makes it resemble with A. Alkali metals B. Halogens
Answer» Write one property of hydrogen which makes it resemble with A. Alkali metals B. Halogens

Discussion

31.	Kazi and Priyam want to prepare dil. H2SO4 . Kazi added conc. H2SO4 to water slowly with constant stirring & cooling whereas Priyam added water to conc. H2SO4. Name the student who was correct and why?
Answer» Kazi and Priyam want to prepare dil. $H_{2} S O_{4}$ . Kazi added conc. $H_{2} S O_{4}$ to water slowly with constant stirring & cooling whereas Priyam added water to conc. $H_{2} S O_{4}$ . Name the student who was correct and why?

Discussion

32.	Ozone is formed in the upper atmosphere from oxygen by the action of :
Answer» Ozone is formed in the upper atmosphere from oxygen by the action of :

Discussion

33.	How many carats is pure gold? why is pure gold not suitable for making ornaments?
Answer» How many carats is pure gold? why is pure gold not suitable for making ornaments?

Discussion

34.	When a red litmus paper is dipped in the aqueous solution of X there is no change in colour. When a blue litmus paper is dipped in the same solution it turns red. Which among the following options can be the chemical X?
Answer» When a red litmus paper is dipped in the aqueous solution of $X$ there is no change in colour. When a blue litmus paper is dipped in the same solution it turns red. Which among the following options can be the chemical $X$ ?

Discussion

35.	Which of the following statements is correct with respect to natural resouces?
Answer» Which of the following statements is correct with respect to natural resouces?

Discussion

36.	Are all the hydrated salts crystalline? What are anhydrous salts?
Answer» Are all the hydrated salts crystalline? What are anhydrous salts?

Discussion

37.	(a) Why does aluminium not react with water under ordinary conditions? (b) Name two metals which can displace hydrogen from dilute acids. (c) Name two metals which cannot displace hydrogen from dilute acids.
Answer» (a) Why does aluminium not react with water under ordinary conditions? (b) Name two metals which can displace hydrogen from dilute acids. (c) Name two metals which cannot displace hydrogen from dilute acids.

Discussion

38.	Name one metal each which is extracted by: (a) reduction with carbon. (b) electrolytic reduction. (c) reduction with aluminium (d) reduction with heat alone.
Answer» Name one metal each which is extracted by: (a) reduction with carbon. (b) electrolytic reduction. (c) reduction with aluminium (d) reduction with heat alone.

Discussion

39.	Dettol is the mixture of
Answer» Dettol is the mixture of

Discussion

40.	State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. (a) PbO+CO→Pb+CO2 (b) H2S+Cl2→2HCl+S
Answer» State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. (a) $P b O + C O \to P b + C O_{2}$ (b) $H_{2} S + C l_{2} \to 2 H C l + S$

40.

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. (a) PbO+CO→Pb+CO2 (b) H2S+Cl2→2HCl+S

Answer»

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced.

(a) $P b O + C O \to P b + C O_{2}$

(b) $H_{2} S + C l_{2} \to 2 H C l + S$

Discussion

41.	The industrial preparation of ethanol is stated from ___
Answer» The industrial preparation of ethanol is stated from ___

Discussion

42.	An element A from group 14 of the periodic table combines with an element B from group 16. (i) What type of chemical bond is formed? (ii) Give the formula of the compound formed.
Answer» An element A from group 14 of the periodic table combines with an element B from group 16. (i) What type of chemical bond is formed? (ii) Give the formula of the compound formed.

42.

An element A from group 14 of the periodic table combines with an element B from group 16. (i) What type of chemical bond is formed? (ii) Give the formula of the compound formed.

Answer»

An element A from group 14 of the periodic table combines with an element B from group 16.

(i) What type of chemical bond is formed?

(ii) Give the formula of the compound formed.

Discussion

43.	Question 21 2 mL each of concentrated HCl,HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be (a) Al (b) Au (c) Cu (d) Pt
Answer» Question 21 2 mL each of concentrated $HCl, {HNO}_{3}$ and a mixture of concentrated $HCl$ and concentrated ${HNO}_{3}$ in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be (a) $Al$ (b) $Au$ (c) $Cu$ (d) $Pt$

Discussion

44.	Wasp stings can be treated with : (a) baking soda (b) vinegar (c) washing soda (d) molk of magnesia
Answer» Wasp stings can be treated with : (a) baking soda (b) vinegar (c) washing soda (d) molk of magnesia

44.

Wasp stings can be treated with : (a) baking soda (b) vinegar (c) washing soda (d) molk of magnesia

Answer»

Wasp stings can be treated with :

(a) baking soda

(b) vinegar

(c) washing soda

(d) molk of magnesia

Discussion

45.	An unknown oxide of manganese is reacted with carbon to form manganese metal and CO2. If 31.6 g of the oxide, MnxOy yielded 13.2 g of CO2 then the simplest formula of the oxide is: (if atomic mass of Mn=55 u)
Answer» An unknown oxide of manganese is reacted with carbon to form manganese metal and $C O_{2}$ . If $31.6 g$ of the oxide, $M n_{x} O_{y}$ yielded $13.2 g$ of $C O_{2}$ then the simplest formula of the oxide is: (if atomic mass of $M n = 55 u$ )

Discussion

46.	The geometric form of crystals is the result of the orderly arrangement of _____.
Answer» The geometric form of crystals is the result of the orderly arrangement of _____.

Discussion

47.	The basicity of sulphuric acid is :
Answer» The basicity of sulphuric acid is :

Discussion

48.	What change in colour is observed when white silver chloride is left exposed to sunlight . State the type of and state the reaction
Answer» What change in colour is observed when white silver chloride is left exposed to sunlight . State the type of and state the reaction

Discussion

49.	What are five types of salts? Explain with examples.
Answer» What are five types of salts? Explain with examples.

Discussion

50.	Is sublimation a chemical change or physical change? What about sublimation of ammonium chloride?
Answer» Is sublimation a chemical change or physical change? What about sublimation of ammonium chloride?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

State what happen when a concentrated solution of sodium chloride is electrolysed . Explain briefly?

__ analysis deals with the determination of composition of a mixture.

Question 36 Suggest suitable mechanism(s) for waste management in fertilizer industries.

what are the uses of ketone and aldehyde in everyday life

Why do some equations become unbalanced???

(a) What is the general name of all the compounds made up of carbon and hydrogen? (b) Why does carbon form compounds mainly by covalent bonding?

What can we say about the nature of alcohols when in a solution?

In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace?

A copper article if exposed to air, develops a green coloured layer of:

A sodium cation has different number of electrons from

If a substance increases the rate of reaction, it is termed as a ___ catalyst.

In the laboratory preparation of Nitric Acid, state the role of concentrated Sulphuric Acid

Four grams of caustic soda contains : (a) 6.02×1023atoms of it, (b) 4 g atom of sodium, (c) 6.02×1022 molecules (d) 4 moles of NaOH.

Which of the following is non-metal displacement reaction ?

In the given arrangement, when electricity is passed through sodium chloride solution, the bulb glows. What does it indicate?

Acetic acid reacts with a sodium compound to release a gas which turns lime water milky. What might be the sodium compound?

Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.

Question 40 Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated. Why?

Question 40 Identify the elements with the following property and arrange them in increasing order of their reactivity: (a) An element which is a soft and a reactive metal. (b) The metal which is an important constituent of limestone. (c) The metal which exists in liquid state at room temperature.

Which of the following elements does not lose an electron easily? (a) Na (b) F (c) Mg (d) Al

Write the equations for the reaction of Hydrochloric acid with the following: [4 MARKS] a) Bleaching Powder b) Lead Nitrate Solution c) Manganese(IV) Oxide d) Ammonia

DEAR SUBJECT EXPERT, Can you please clear my concept about the CHEMICAL PROPERTIES OF METALS AND NON-METALS ???

Is this balanced correctly? 2Al+6HCl=2Al​​​​​Cl3+3H2

Hybridization of OCl-

How can we remember periodic table ?

How many moles of NaHCO3 are present in 420 g of NaHCO3?

Difference between hydroxide ion and hydroxyl ion?

In a test, Rashi has to write the chemical equation for the formation of Hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?

Find A and B from the following reaction. CH3CH2OH+O2→A+B+Heat and light

Write one property of hydrogen which makes it resemble with A. Alkali metals B. Halogens

Kazi and Priyam want to prepare dil. H2SO4 . Kazi added conc. H2SO4 to water slowly with constant stirring &amp; cooling whereas Priyam added water to conc. H2SO4. Name the student who was correct and why?

Ozone is formed in the upper atmosphere from oxygen by the action of :

How many carats is pure gold? why is pure gold not suitable for making ornaments?

When a red litmus paper is dipped in the aqueous solution of X there is no change in colour. When a blue litmus paper is dipped in the same solution it turns red. Which among the following options can be the chemical X?

Which of the following statements is correct with respect to natural resouces?

Are all the hydrated salts crystalline? What are anhydrous salts?

(a) Why does aluminium not react with water under ordinary conditions? (b) Name two metals which can displace hydrogen from dilute acids. (c) Name two metals which cannot displace hydrogen from dilute acids.

Name one metal each which is extracted by: (a) reduction with carbon. (b) electrolytic reduction. (c) reduction with aluminium (d) reduction with heat alone.

Dettol is the mixture of

State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced. (a) PbO+CO→Pb+CO2 (b) H2S+Cl2→2HCl+S

The industrial preparation of ethanol is stated from ___

An element A from group 14 of the periodic table combines with an element B from group 16. (i) What type of chemical bond is formed? (ii) Give the formula of the compound formed.

Wasp stings can be treated with : (a) baking soda (b) vinegar (c) washing soda (d) molk of magnesia

An unknown oxide of manganese is reacted with carbon to form manganese metal and CO2. If 31.6 g of the oxide, MnxOy yielded 13.2 g of CO2 then the simplest formula of the oxide is: (if atomic mass of Mn=55 u)

The geometric form of crystals is the result of the orderly arrangement of _____.

The basicity of sulphuric acid is :

What change in colour is observed when white silver chloride is left exposed to sunlight . State the type of and state the reaction

What are five types of salts? Explain with examples.

Is sublimation a chemical change or physical change? What about sublimation of ammonium chloride?

Is this balanced correctly? 2Al+6HCl=2AlCl3+3H2

Kazi and Priyam want to prepare dil. H2SO4 . Kazi added conc. H2SO4 to water slowly with constant stirring & cooling whereas Priyam added water to conc. H2SO4. Name the student who was correct and why?