5083 + Interview Questions in Chemistry Page 17 InterviewSolution

801.	Burning of LPG is considered as both physical and chemical change .Give reason.
Answer» Burning of LPG is considered as both physical and chemical change .Give reason.

Discussion

802.	When aqueous AgNO3 is electrolyzed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the Amount of Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)
Answer» When aqueous $A g N O_{3}$ is electrolyzed using Pt electrodes, if 3.2 g of $O_{2}$ is liberated at the anode, the Amount of Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

Discussion

803.	Question 6 (v) Mark ‘T’ if the statement is true and ‘F’ if it is false: (v) Tooth decay is caused by the presence of a base.
Answer» Question 6 (v) Mark ‘T’ if the statement is true and ‘F’ if it is false: (v) Tooth decay is caused by the presence of a base.

Discussion

804.	True or false? (a) Oxides of metals are basic. (b) Common salt is acidic. (c) Salts corrode metals. (d) Bases are formed by the neutralization reaction between acids and salts. (e) Salts are neutral.
Answer» True or false? (a) Oxides of metals are basic. (b) Common salt is acidic. (c) Salts corrode metals. (d) Bases are formed by the neutralization reaction between acids and salts. (e) Salts are neutral.

804.

True or false? (a) Oxides of metals are basic. (b) Common salt is acidic. (c) Salts corrode metals. (d) Bases are formed by the neutralization reaction between acids and salts. (e) Salts are neutral.

Answer»

True or false?

(a) Oxides of metals are basic.

(b) Common salt is acidic.

(c) Salts corrode metals.

(d) Bases are formed by the neutralization reaction between acids and salts.

(e) Salts are neutral.

Discussion

805.	How to find percolation rate of water
Answer» How to find percolation rate of water

Discussion

806.	Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Answer» Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

Discussion

807.	Read the two statements and choose the correct option. (i) The compressed air in a tyre exerts a force enough to lift a heavy car. (ii) In a syringe, the plunger compresses the liquid.
Answer» Read the two statements and choose the correct option. (i) The compressed air in a tyre exerts a force enough to lift a heavy car. (ii) In a syringe, the plunger compresses the liquid.

Discussion

808.	Good quality wool is obtained from fleece having:
Answer» Good quality wool is obtained from fleece having:

Discussion

809.	Write the name of flame used in charcoal formation
Answer» Write the name of flame used in charcoal formation

Discussion

810.	What is the difference between fabrics and fibre
Answer» What is the difference between fabrics and fibre

Discussion

811.	How do we test whether a substance is an acid or base? Explain the mechanism. Give examples of some substances that can be used for testing acids and bases. [3 MARKS]
Answer» How do we test whether a substance is an acid or base? Explain the mechanism. Give examples of some substances that can be used for testing acids and bases. [3 MARKS]

Discussion

812.	The gaseous reaction: A(g)+nB(g)⇌mC(g) is represented by following curves. What is the value of n+m?
Answer» The gaseous reaction: $A (g) + n B (g) ⇌ m C (g)$ is represented by following curves. What is the value of $n + m$ ?

Discussion

813.	In a reaction, the concentration of a reactant (A) changes from 0.200 mol L−1 to 0.150 mol L−1 in 10 minutes. What is the average rate of reaction during this interval ?
Answer» In a reaction, the concentration of a reactant (A) changes from $0.200 m o l L^{- 1}$ to $0.150 m o l L^{- 1}$ in 10 minutes. What is the average rate of reaction during this interval ?

Discussion

814.	Explain Why -(a) Soap cannot be used in hard water .(b) Oil does not mix in water . However, oil and water become homogeneous if a sufficient quantity of detergent is added .(c) Synthetic detergents are superior to soap .(d) Often coloured spots are formed on clothes during washing .(e) Tobacco masheri should not be used for cleaning teeth.
Answer» Explain Why - (a) Soap cannot be used in hard water . (b) Oil does not mix in water . However, oil and water become homogeneous if a sufficient quantity of detergent is added . (c) Synthetic detergents are superior to soap . (d) Often coloured spots are formed on clothes during washing . (e) Tobacco masheri should not be used for cleaning teeth.

Discussion

815.	Write the role of the mouth and stomach in the process of digestion.
Answer» Write the role of the mouth and stomach in the process of digestion.

Discussion

816.	Question 11 (c) Fill in the blanks in the following statements. (c) Wool yielding animals bear ___ on their body.
Answer» Question 11 (c) Fill in the blanks in the following statements. (c) Wool yielding animals bear ___ on their body.

816.

Question 11 (c) Fill in the blanks in the following statements. (c) Wool yielding animals bear ___ on their body.

Answer»

Question 11 (c)

Fill in the blanks in the following statements.
(c) Wool yielding animals bear ___ on their body.

Discussion

817.	In Lavoisier's experiment which element is taken in retort and heated?
Answer» In Lavoisier's experiment which element is taken in retort and heated?

Discussion

818.	Which of the following statements are correct?
Answer» Which of the following statements are correct?

Discussion

819.	If 12 r resis†an†an ce is setup with 12 wired a form of cube,then its one edge eqivalent resis†an ce
Answer» If 12 r resis†an†an ce is setup with 12 wired a form of cube,then its one edge eqivalent resis†an ce

Discussion

820.	What is the difference in the rocks of the C horizon and the rocks in the bedrock.
Answer» What is the difference in the rocks of the C horizon and the rocks in the bedrock.

Discussion

821.	Give one use of all the materials given below.Aluminium, chlorine, gold, and hydrogen
Answer» Give one use of all the materials given below. Aluminium, chlorine, gold, and hydrogen

Discussion

822.	Which of the following are the alternate arrangements for sewage disposal?
Answer» Which of the following are the alternate arrangements for sewage disposal?

Discussion

823.	What are the pros and cons of using an alcohol thermometer?
Answer» What are the pros and cons of using an alcohol thermometer?

Discussion

824.	The amount of Ag (atomic mass = 108) deposited at the cathode when a current of 0.5 amp is passed through a solution of AgNO3 for 1 hour is closest to :
Answer» The amount of Ag (atomic mass = 108) deposited at the cathode when a current of 0.5 amp is passed through a solution of AgNO $_{3}$ for 1 hour is closest to :

Discussion

825.	What happens when it rains heavily on soil without a vegetational cover?
Answer» What happens when it rains heavily on soil without a vegetational cover?

Discussion

826.	Identify X in the following reaction:HCl (aq)+X→NaCl(s)+H2CO3(aq)
Answer» Identify X in the following reaction: $HCl (aq) + X \to NaCl (s) + H_{2} {CO}_{3} (aq)$

Discussion

827.	Match the following air pollutants with their major source. (i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide (a) Coal burn (b) Fossil fuels (c) Automobiles
Answer» Match the following air pollutants with their major source. (i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide (a) Coal burn (b) Fossil fuels (c) Automobiles

827.

Match the following air pollutants with their major source. (i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide (a) Coal burn (b) Fossil fuels (c) Automobiles

Answer»

Match the following air pollutants with their major source.

(i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide

(a) Coal burn (b) Fossil fuels (c) Automobiles

Discussion

828.	The active mass of 7.0gof nitrogen ia2.0L container would be??
Answer» The active mass of 7.0gof nitrogen ia2.0L container would be??

Discussion

829.	Write various steps for processing fibers into wool.
Answer» Write various steps for processing fibers into wool.

Discussion

830.	The factor which is not affecting the conductivity of any solution is
Answer» The factor which is not affecting the conductivity of any solution is

Discussion

831.	A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again?(1) HCI solution (2) NaOH solution (3) NH3 solution (4) NaCI solution
Answer» A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again? (1) HCI solution (2) NaOH solution (3) NH₃ solution (4) NaCI solution

Discussion

832.	At 298 K, the limiting molar conductivity of a weak monobasic acid is 4×102S cm2mol−1. At 298 K, for an aqueous solution of the acid the degree of dissociation is α and the molar conductivity is y×102S cm2mol−1 . At 298 K, upon 20 times dilution with water, the molar conductivity of the solution becomes 3y×102S cm2mol−1The value of y is
Answer» At $298 K$ , the limiting molar conductivity of a weak monobasic acid is $4 \times 10^{2} S c m^{2} m o l^{- 1}$ . At $298 K$ , for an aqueous solution of the acid the degree of dissociation is $α$ and the molar conductivity is $y \times 10^{2} S c m^{2} m o l^{- 1}$ . At $298 K$ , upon $20$ times dilution with water, the molar conductivity of the solution becomes $3 y \times 10^{2} S c m^{2} m o l^{- 1}$ The value of $y$ is

Discussion

833.	The rate of evaporation increases with __________.
Answer» The rate of evaporation increases with __________.

Discussion

834.	In a chemical reaction, the elements are always present in a definite proportion by ___.
Answer» In a chemical reaction, the elements are always present in a definite proportion by ___.

Discussion

835.	A pure sample of (NH4)2SO4 contains 8 moles of O-atoms. Find the number of electrons present in the sample.
Answer» A pure sample of $(N H_{4})_{2} S O_{4}$ contains $8$ moles of $O$ -atoms. Find the number of electrons present in the sample.

Discussion

836.	Do all indicators reacts with both acids and bases?
Answer» Do all indicators reacts with both acids and bases?

Discussion

837.	Take three mugs of water and pour them on three different surfaces, namely: cemented floor, asphalt and soil in a flower pot. Which of these surfaces will show the fastest infiltration?
Answer» Take three mugs of water and pour them on three different surfaces, namely: cemented floor, asphalt and soil in a flower pot. Which of these surfaces will show the fastest infiltration?

Discussion

838.	Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
Answer» Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

Discussion

839.	Avagadros no. Is changed from 6.02310^23 to 310^23 what is the molar mass of calcium
Answer» Avagadros no. Is changed from 6.02310^23 to 310^23 what is the molar mass of calcium

Discussion

840.	What is the moluler formula of nitrogen oxide
Answer» What is the moluler formula of nitrogen oxide

Discussion

841.	Question 3What happens when dilute hydrochloric acid is added to iron filings?
Answer» Question 3 What happens when dilute hydrochloric acid is added to iron filings?

Discussion

842.	How does the fragrance of a perfume spread?
Answer» How does the fragrance of a perfume spread?

Discussion

843.	Question 39Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?
Answer» Question 39 Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

Discussion

844.	What advantage does silk have over cotton?
Answer» What advantage does silk have over cotton?

Discussion

845.	A sample of 12g of coke was heated till it underwent complete combustion. Carbon dioxide gas thus formed was collected and was found to weigh 44 g. Calculate the mass of oxygen consumed during this reaction.
Answer» A sample of 12g of coke was heated till it underwent complete combustion. Carbon dioxide gas thus formed was collected and was found to weigh 44 g. Calculate the mass of oxygen consumed during this reaction.

Discussion

846.	Which acid can dissolve gold and which will make gold
Answer» Which acid can dissolve gold and which will make gold

Discussion

847.	what is heutralisation ?
Answer» what is heutralisation ?

Discussion

848.	Is petrol an element or compound?
Answer» Is petrol an element or compound?

Discussion

849.	What is the vapour density of mixture of PCI, at250^° C when it has dissociated to the extent of80%?
Answer» What is the vapour density of mixture of PCI, at250^° C when it has dissociated to the extent of80%?

Discussion

850.	What will be the state of a substance below its freezing point?
Answer» What will be the state of a substance below its freezing point?

Discussion

Explore topic-wise InterviewSolutions in .

Burning of LPG is considered as both physical and chemical change .Give reason.

When aqueous AgNO3 is electrolyzed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the Amount of Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

Question 6 (v) Mark ‘T’ if the statement is true and ‘F’ if it is false: (v) Tooth decay is caused by the presence of a base.

True or false? (a) Oxides of metals are basic. (b) Common salt is acidic. (c) Salts corrode metals. (d) Bases are formed by the neutralization reaction between acids and salts. (e) Salts are neutral.

How to find percolation rate of water

Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

Read the two statements and choose the correct option. (i) The compressed air in a tyre exerts a force enough to lift a heavy car. (ii) In a syringe, the plunger compresses the liquid.

Good quality wool is obtained from fleece having:

Write the name of flame used in charcoal formation

What is the difference between fabrics and fibre

How do we test whether a substance is an acid or base? Explain the mechanism. Give examples of some substances that can be used for testing acids and bases. [3 MARKS]

The gaseous reaction: A(g)+nB(g)⇌mC(g) is represented by following curves. What is the value of n+m?

In a reaction, the concentration of a reactant (A) changes from 0.200 mol L−1 to 0.150 mol L−1 in 10 minutes. What is the average rate of reaction during this interval ?

Write the role of the mouth and stomach in the process of digestion.

Question 11 (c) Fill in the blanks in the following statements. (c) Wool yielding animals bear ___ on their body.

In Lavoisier's experiment which element is taken in retort and heated?

Which of the following statements are correct?

If 12 r resis†an†an ce is setup with 12 wired a form of cube,then its one edge eqivalent resis†an ce

What is the difference in the rocks of the C horizon and the rocks in the bedrock.

Give one use of all the materials given below.Aluminium, chlorine, gold, and hydrogen

Which of the following are the alternate arrangements for sewage disposal?

What are the pros and cons of using an alcohol thermometer?

The amount of Ag (atomic mass = 108) deposited at the cathode when a current of 0.5 amp is passed through a solution of AgNO3 for 1 hour is closest to :

What happens when it rains heavily on soil without a vegetational cover?

Identify X in the following reaction:HCl (aq)+X→NaCl(s)+H2CO3(aq)

Match the following air pollutants with their major source. (i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide (a) Coal burn (b) Fossil fuels (c) Automobiles

The active mass of 7.0gof nitrogen ia2.0L container would be??

Write various steps for processing fibers into wool.

The factor which is not affecting the conductivity of any solution is

The rate of evaporation increases with __________.

In a chemical reaction, the elements are always present in a definite proportion by ___.

A pure sample of (NH4)2SO4 contains 8 moles of O-atoms. Find the number of electrons present in the sample.

Do all indicators reacts with both acids and bases?

Take three mugs of water and pour them on three different surfaces, namely: cemented floor, asphalt and soil in a flower pot. Which of these surfaces will show the fastest infiltration?

Avagadros no. Is changed from 6.023*10^23 to 3*10^23 what is the molar mass of calcium

What is the moluler formula of nitrogen oxide

Question 3What happens when dilute hydrochloric acid is added to iron filings?

How does the fragrance of a perfume spread?

Question 39Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

What advantage does silk have over cotton?

A sample of 12g of coke was heated till it underwent complete combustion. Carbon dioxide gas thus formed was collected and was found to weigh 44 g. Calculate the mass of oxygen consumed during this reaction.

Which acid can dissolve gold and which will make gold

what is heutralisation ?

Is petrol an element or compound?

What is the vapour density of mixture of PCI, at250^° C when it has dissociated to the extent of80%?

What will be the state of a substance below its freezing point?

Avagadros no. Is changed from 6.02310^23 to 310^23 what is the molar mass of calcium