15280 + Interview Questions in Chemistry Page 242 InterviewSolution

12051.	What is the concentration of the solution obtained when 40 g of NaOH is dissolved in 1 L of water?
Answer» What is the concentration of the solution obtained when 40 g of NaOH is dissolved in 1 L of water?

Discussion

12052.	Which of the following is/are applications of electrolysis?
Answer» Which of the following is/are applications of electrolysis?

Discussion

12053.	Question 22 An alloy is: (a) an element. (b) a compound. (c) a homogeneous mixture. (d) a heterogeneous mixture.
Answer» Question 22 An alloy is: (a) an element. (b) a compound. (c) a homogeneous mixture. (d) a heterogeneous mixture.

Discussion

12054.	Which of the following is/are tetravalent?
Answer» Which of the following is/are tetravalent?

Discussion

12055.	Which of these is used to repel moths?
Answer» Which of these is used to repel moths?

Discussion

12056.	How H2+Cl2→2HCl can be a redox reaction?
Answer» How $H_{2} + C l_{2} \to 2 H C l$ can be a redox reaction?

Discussion

12057.	An organic compound 'A' is a constituent of antifreeze and has the molecular formula C2H6O. Upon reaction with alkaline KMnO4, the compound 'A' is oxidised to another compound 'B' with formula C2H4O2 . ldentify the compounds 'A' and 'B'. Write the chemical equation for the reaction which leads to the formation of 'B'.
Answer» An organic compound 'A' is a constituent of antifreeze and has the molecular formula C₂H₆O. Upon reaction with alkaline KMnO₄, the compound 'A' is oxidised to another compound 'B' with formula C₂H₄O₂ . ldentify the compounds 'A' and 'B'. Write the chemical equation for the reaction which leads to the formation of 'B'.

Discussion

12058.	Which of the following can be used as a reducing agent in smelting?
Answer» Which of the following can be used as a reducing agent in smelting?

Discussion

12059.	A molecule should be____.
Answer» A molecule should be____.

Discussion

12060.	Question 41(b) Compound X and aluminium are used to join railway tracks. Name the reaction
Answer» Question 41(b) Compound X and aluminium are used to join railway tracks. Name the reaction

Discussion

12061.	Potash alum is a ___.
Answer» Potash alum is a ___.

Discussion

12062.	How do the properties of isomers differ as the number of carbon atoms increase (e.g. boiling point, melting point, mass). Please state at least 4.
Answer» How do the properties of isomers differ as the number of carbon atoms increase (e.g. boiling point, melting point, mass). Please state at least 4.

Discussion

12063.	Acid + base → salt + water This is. A neutralization reaction Can we say that only neutral salt are formed as a result of neutralization reactions... because in neutralization reactions equally concentrated acids react with equally concentrated bases.
Answer» Acid + base → salt + water This is. A neutralization reaction Can we say that only neutral salt are formed as a result of neutralization reactions... because in neutralization reactions equally concentrated acids react with equally concentrated bases.

Discussion

12064.	What is the difference between bleaching powder and bleaching soda?
Answer» What is the difference between bleaching powder and bleaching soda?

Discussion

12065.	How would you distinguish between dilute HCl and dilute HNO3 by addition of only one solution.
Answer» How would you distinguish between dilute HCl and dilute HNO3 by addition of only one solution.

Discussion

12066.	The type of bond between element 12X and 35Y is –––––––
Answer» The type of bond between element $_{12} X$ and $_{35} Y$ is –––––––

Discussion

12067.	The TCA cycle is named after
Answer» The TCA cycle is named after

Discussion

12068.	After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food packed in plastic bags or plastic cans. After eating the food some friends collected the leftover food and plastic bags etc and planned to dispose them off by burning. Rakesh immediately checked them and suggested to segregate the leftover food and peels of fruits from the plastic materials and respectively dispose them off separately in the green and red dustbins placed in the corner of the park. (a) In your opinion, is burning plastic an ecofriendly method of waste disposal? Why? State the advantage of method suggested by Rakesh. (b) How can we contribute in maintaining the parks and roads neat and clean?
Answer» After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food packed in plastic bags or plastic cans. After eating the food some friends collected the leftover food and plastic bags etc and planned to dispose them off by burning. Rakesh immediately checked them and suggested to segregate the leftover food and peels of fruits from the plastic materials and respectively dispose them off separately in the green and red dustbins placed in the corner of the park. (a) In your opinion, is burning plastic an ecofriendly method of waste disposal? Why? State the advantage of method suggested by Rakesh. (b) How can we contribute in maintaining the parks and roads neat and clean?

12068.

After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food packed in plastic bags or plastic cans. After eating the food some friends collected the leftover food and plastic bags etc and planned to dispose them off by burning. Rakesh immediately checked them and suggested to segregate the leftover food and peels of fruits from the plastic materials and respectively dispose them off separately in the green and red dustbins placed in the corner of the park. (a) In your opinion, is burning plastic an ecofriendly method of waste disposal? Why? State the advantage of method suggested by Rakesh. (b) How can we contribute in maintaining the parks and roads neat and clean?

Answer»

After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food packed in plastic bags or plastic cans. After eating the food some friends collected the leftover food and plastic bags etc and planned to dispose them off by burning. Rakesh immediately checked them and suggested to segregate the leftover food and peels of fruits from the plastic materials and respectively dispose them off separately in the green and red dustbins placed in the corner of the park.

(a) In your opinion, is burning plastic an ecofriendly method of waste disposal? Why? State the advantage of method suggested by Rakesh.

(b) How can we contribute in maintaining the parks and roads neat and clean?

Discussion

12069.	Which of the following alloy is used in the construction of aircraft and scientific instruments?
Answer» Which of the following alloy is used in the construction of aircraft and scientific instruments?

Discussion

12070.	The reactions in which precipitate is formed are known as:
Answer» The reactions in which precipitate is formed are known as:

Discussion

12071.	The IUPAC name of CH3CH2CH2COOH is:
Answer» The IUPAC name of CH₃CH₂CH₂COOH is:

Discussion

12072.	For the conservation of various natural resources, first of all we have to:
Answer» For the conservation of various natural resources, first of all we have to:

Discussion

12073.	From the equation: C + 2H2SO4 → CO2 + 2H2O +2SO2 Calculate: The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).
Answer» From the equation: C + 2H₂SO₄ → CO₂+ 2H₂O +2SO₂ Calculate: The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).

12073.

From the equation: C + 2H2SO4 → CO2 + 2H2O +2SO2 Calculate: The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).

Answer»

From the equation:

C + 2H₂SO₄ → CO₂+ 2H₂O +2SO₂

Calculate:

The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).

Discussion

12074.	Why was there a necessity of classifying the elements into certain groups?
Answer» Why was there a necessity of classifying the elements into certain groups?

Discussion

12075.	Consider the reaction, A → B. The rate of reaction = −d[A]dt. Which of the following statement(s) define the negative sign used in the rate of the given reaction?
Answer» Consider the reaction, A $\to$ B. The rate of reaction = $- \frac{d [A]}{d t} .$ Which of the following statement(s) define the negative sign used in the rate of the given reaction?

Discussion

12076.	(a) State any three differences between the physical properties of metal and non-metals. (b) Differentiate between metals and non-metals on the basis of their chemical properties. (c) State three reasons (of which at least one must be chemical) for believing that sodium is a metal. (d) State three reasons (of which at least one must be chemical) for believing that sulphur is a non - metal. (e) Which non-metal has been placed in the reactivity series of metal?
Answer» (a) State any three differences between the physical properties of metal and non-metals. (b) Differentiate between metals and non-metals on the basis of their chemical properties. (c) State three reasons (of which at least one must be chemical) for believing that sodium is a metal. (d) State three reasons (of which at least one must be chemical) for believing that sulphur is a non - metal. (e) Which non-metal has been placed in the reactivity series of metal?

Discussion

12077.	The oxidation number of Hydrogen is +1 except in
Answer» The oxidation number of Hydrogen is +1 except in

Discussion

12078.	Which of the following is an example of a primary cell?
Answer» Which of the following is an example of a primary cell?

Discussion

12079.	1) How can you protect the following from rusting? [2 MARKS] (a) Iron mug (b) An iron spoon (c) Bicycle handle (d) Bicycle chain 2) Write a short note on the electronic nature of non-metals? [3 MARKS]
Answer» 1) How can you protect the following from rusting? [2 MARKS] (a) Iron mug (b) An iron spoon (c) Bicycle handle (d) Bicycle chain 2) Write a short note on the electronic nature of non-metals? [3 MARKS]

Discussion

12080.	A universal indicator can detect what range of pH values?
Answer» A universal indicator can detect what range of pH values?

Discussion

12081.	A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish - brown. On rinsing the shirt with plenty of water, the reddish - brown stain turns yellow again. (a) Name the natural indicator present in curry stain. (b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt. (c) What is the nature of soap (acidic / basic) as shown by the indicator present in curry stain ?
Answer» A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish - brown. On rinsing the shirt with plenty of water, the reddish - brown stain turns yellow again. (a) Name the natural indicator present in curry stain. (b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt. (c) What is the nature of soap (acidic / basic) as shown by the indicator present in curry stain ?

12081.

A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish - brown. On rinsing the shirt with plenty of water, the reddish - brown stain turns yellow again. (a) Name the natural indicator present in curry stain. (b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt. (c) What is the nature of soap (acidic / basic) as shown by the indicator present in curry stain ?

Answer»

A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish - brown. On rinsing the shirt with plenty of water, the reddish - brown stain turns yellow again.

(a) Name the natural indicator present in curry stain.

(b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.

(c) What is the nature of soap (acidic / basic) as shown by the indicator present in curry stain ?

Discussion

12082.	How are bonds made between ions?
Answer» How are bonds made between ions?

Discussion

12083.	An atom X has 2,8,7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. (a) What type of bond will be formed between X and Y ? (b) Write the formula of the compound formed.
Answer» An atom X has 2,8,7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. (a) What type of bond will be formed between X and Y ? (b) Write the formula of the compound formed.

12083.

An atom X has 2,8,7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. (a) What type of bond will be formed between X and Y ? (b) Write the formula of the compound formed.

Answer»

An atom X has 2,8,7 electrons in its shell. It combines with Y having 1 electron in its outermost shell.

(a) What type of bond will be formed between X and Y ?

(b) Write the formula of the compound formed.

Discussion

12084.	The ratio of the number of atoms in one mole of oxygen to the number of atoms in one-mole ozone is _____.
Answer» The ratio of the number of atoms in one mole of oxygen to the number of atoms in one-mole ozone is _____.

Discussion

12085.	How is chemical reactivity determined?
Answer» How is chemical reactivity determined?

Discussion

12086.	If an element is in 2nd group and 3rd period in the modern periodic table then it is most likely to be a
Answer» If an element is in 2nd group and 3rd period in the modern periodic table then it is most likely to be a

Discussion

12087.	Write the type of reactions in the following: i. Reaction between an acid and a base ii.Rusting of iron
Answer» Write the type of reactions in the following: i. Reaction between an acid and a base ii.Rusting of iron

Discussion

12088.	What is the valency of xenon
Answer» What is the valency of xenon

Discussion

12089.	The liquefied gases used in cryogenics are held in special containers called __ flasks.
Answer» The liquefied gases used in cryogenics are held in special containers called __ flasks.

Discussion

12090.	_________ gives blue colour to the glass.
Answer» _________ gives blue colour to the glass.

Discussion

12091.	drawbacks of mendellev's Periodic table
Answer» drawbacks of mendellev's Periodic table

Discussion

12092.	Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.
Answer» Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

Discussion

12093.	What chemical process is used for obtaining a metal form its oxide?
Answer» What chemical process is used for obtaining a metal form its oxide?

Discussion

12094.	(a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.
Answer» (a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

Discussion

12095.	Which of the following properties are a result of free electrons to be present in metals?
Answer» Which of the following properties are a result of free electrons to be present in metals?

Discussion

12096.	Give structural formula of E - Hept-5-en-1, 3-diyne
Answer» Give structural formula of E - Hept-5-en-1, 3-diyne

Discussion

12097.	Find the percentage of water of crystallisation in CuSO4.5H2O. (At. Mass Cu−64,H=1,O=16,S=32)
Answer» Find the percentage of water of crystallisation in $C u S O_{4} .5 H_{2} O .$ (At. Mass $C u - 64, H = 1, O = 16, S = 32$ )

Discussion

12098.	State the allotropes of carbon.
Answer» State the allotropes of carbon.

Discussion

12099.	What is meant by polar water molecule?
Answer» What is meant by polar water molecule?

Discussion

12100.	An element reacts with oxygen to give a compound with high melting point, this compound is also soluble in water , the element is likely to be ?
Answer» An element reacts with oxygen to give a compound with high melting point, this compound is also soluble in water , the element is likely to be ?

Discussion

Explore topic-wise InterviewSolutions in .

What is the concentration of the solution obtained when 40 g of NaOH is dissolved in 1 L of water?

Which of the following is/are applications of electrolysis?

Question 22 An alloy is: (a) an element. (b) a compound. (c) a homogeneous mixture. (d) a heterogeneous mixture.

Which of the following is/are tetravalent?

Which of these is used to repel moths?

How H2+Cl2→2HCl can be a redox reaction?

Which of the following can be used as a reducing agent in smelting?

A molecule should be____.

Question 41(b) Compound X and aluminium are used to join railway tracks. Name the reaction

Potash alum is a ___.

How do the properties of isomers differ as the number of carbon atoms increase (e.g. boiling point, melting point, mass). Please state at least 4.

Acid + base → salt + water ​​This is. A neutralization reaction Can we say that only neutral salt are formed as a result of neutralization reactions... because in neutralization reactions equally concentrated acids react with equally concentrated bases.

What is the difference between bleaching powder and bleaching soda?

How would you distinguish between dilute HCl and dilute HNO3 by addition of only one solution.

The type of bond between element 12X and 35Y is –––––––

The TCA cycle is named after

Which of the following alloy is used in the construction of aircraft and scientific instruments?

The reactions in which precipitate is formed are known as:

The IUPAC name of CH3CH2CH2COOH is:

For the conservation of various natural resources, first of all we have to:

From the equation: C + 2H2SO4 → CO2 + 2H2O +2SO2 Calculate: The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).

Why was there a necessity of classifying the elements into certain groups?

Consider the reaction, A → B. The rate of reaction = −d[A]dt. Which of the following statement(s) define the negative sign used in the rate of the given reaction?

The oxidation number of Hydrogen is +1 except in

Which of the following is an example of a primary cell?

1) How can you protect the following from rusting? [2 MARKS] (a) Iron mug (b) An iron spoon (c) Bicycle handle (d) Bicycle chain 2) Write a short note on the electronic nature of non-metals? [3 MARKS]

A universal indicator can detect what range of pH values?

How are bonds made between ions?

An atom X has 2,8,7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. (a) What type of bond will be formed between X and Y ? (b) Write the formula of the compound formed.

The ratio of the number of atoms in one mole of oxygen to the number of atoms in one-mole ozone is _____.

How is chemical reactivity determined?

If an element is in 2nd group and 3rd period in the modern periodic table then it is most likely to be a

Write the type of reactions in the following: i. Reaction between an acid and a base ii.Rusting of iron

What is the valency of xenon

The liquefied gases used in cryogenics are held in special containers called __ flasks.

_________ gives blue colour to the glass.

drawbacks of mendellev's Periodic table

Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

What chemical process is used for obtaining a metal form its oxide?

(a) In organic compounds, which part largely determines the physical and chemical properties. (b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

Which of the following properties are a result of free electrons to be present in metals?

Give structural formula of E - Hept-5-en-1, 3-diyne

Find the percentage of water of crystallisation in CuSO4.5H2O. (At. Mass Cu−64,H=1,O=16,S=32)

State the allotropes of carbon.

What is meant by polar water molecule?

An element reacts with oxygen to give a compound with high melting point, this compound is also soluble in water , the element is likely to be ?

Acid + base → salt + water This is. A neutralization reaction Can we say that only neutral salt are formed as a result of neutralization reactions... because in neutralization reactions equally concentrated acids react with equally concentrated bases.