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Mixed Test - Chemistry

Description: Carbon and its compounds, Classification of elements
Number of Questions: 16
Created by:
Tags: Carbon Classification Catenation Alkynes Soaps and Detergents Functional Groups Reaction of Ethanoic Acid with Base Alkali Metals, Alkaline Earth Metals, Halogens, Noble Elements, Metalloids, Metals etc Ethanol , Properties Carbon Form a Strong Bond Periodic Trends Mendeleev-s classification
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Carbon can form bonds with other carbon atoms. This property of carbon is known as ___________.

  1. covalency

  2. tetravalency

  3. catenation

  4. saponification

  5. electronegativity difference

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Carbon can form bonds with other carbon atoms. This property of carbon is known as catenation.

Alkyne hydrocarbon has at least one ______________bond.

  1. single

  2. double

  3. triple

  4. carbon-carbon

  5. carbon-functional group

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Hydrocarbons having at least one triple bond between two carbon atoms are known as alkyne.

Which of the following cations is/are found in hard water?

  1. Ca and Na

  2. Mg and Na

  3. Ca and Mg

  4. Ca, Na and Mg

  5. Only Na

Show answer
Correct Option: C
Explanation:

Yes, Ca and Mg cations are present in hard water. They react with soap to give insoluble salts.

Soap molecules form __________ with hard water.

  1. lather

  2. scum

  3. precipitate

  4. both 1 and 2

  5. both 2 and 3

Show answer
Correct Option: E
Explanation:

Yes, this is the correct option. With hard water soap solutions form a white precipitate and off white layer over water known as soap scum, instead of producing lather.

Which of the following products are obtained when ester undergoes saponification?

  1. Ethanol and ethanoic acid

  2. Only ethanol

  3. Only ethanoic acid

  4. Scum

  5. Salt and water

Show answer
Correct Option: A
Explanation:

Yes, hydrolysis of an ester by either alkali or an acid to give alcohol and carboxylic acid is called saponification.

Why are detergents preferred over soap in hard water?

  1. They are free flowing and easily available.

  2. They do not precipitate with calcium or magnesium salts in hard water.

  3. They change the hard water into soft water.

  4. They form scum, which can easily be removed.

  5. They have fresh odour.

Show answer
Correct Option: B
Explanation:

Yes, detergents are ammonium or sulphonate salts of carboxylic acids. The charged ends of these compounds do not form precipitates with calcium or magnesium salts in hard water. Hence, detergents retain their cleansing property in hard water.

What is the similarity between sodium and chlorine?

  1. Both are alkali metals.

  2. Both are halogens.

  3. Both have valency + 1.

  4. Both have 7 valence electrons.

  5. Both form acid on reacting with water.

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Valency of both the elements is +1. Sodium on giving one electron, attains stable noble gas structure; 2, 8. If chlorine takes one electron, attains stable noble gas structure; 2, 8, 8.

Alkaline potassium permanganate on reacting with alcohol loses its pink colour, whereas on reacting with carboxylic acid it __________.

  1. changes to blue

  2. darkens to dark pink

  3. gets colourless

  4. shows no change

  5. changes to blue first then colourless

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Alkaline potassium permanganate on reacting with carboxylic acid shows no effect.

Which of the following factors is not responsible for the versatile nature of carbon?

  1. Black colour of carbon

  2. Stability of carbon-carbon bond

  3. Linking of carbon atom by single, double and triple bonds

  4. Property of tetravalency

  5. Property of catenation

Show answer
Correct Option: A
Explanation:

Yes, it is the correct answer. Black colour of carbon has nothing do to with its versatility.

Which of the following is / are true regarding the properties of elements in a group? (a) Electropositive character increases, moving from top to bottom. (b) Atomic radius decreases, moving from top to bottom. (c) Valence electrons increase, moving from top to bottom. (d) Number of shells remains the same moving from top to bottom.

  1. only a

  2. both a and b

  3. both b and c

  4. both c and d

  5. a, b and c

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Only a is correct. Atomic radius increases, the number of valence electrons remains the same and the number of shells increase, while moving from top to bottom in a group.

Which of the following is / are false regarding the trend of properties, moving from left to right in a period? (a) Number of valence electron increases while moving from left to right. (b) Valency increases while moving from left to right. (c) Electropositive character decreases on moving from left to right.

  1. Only a

  2. Only b

  3. Only c

  4. Both a and b

  5. Both b and c

Show answer
Correct Option: B
Explanation:

Yes, it is the correct answer. Valency first increases up to 4 on moving from left to right in a group and then decreases up to zero, hence 'b' is false.

Which of the following does not belong to the same homologous series? CH4, C2H2, C3H8, C4H10, C5H12

  1. CH4

  2. C2H2

  3. C3H6

  4. C4H8

  5. C5H10

Show answer
Correct Option: B
Explanation:

 Yes, C2H2 is the odd one out as it does not belong to the homologous series of alkanes. It should have been C2H6.

Which of the following functional groups of hydrocarbons does not have double bonding?

  1. Ketonic group

  2. Aldehyde group

  3. Halo group

  4. Carboxylic group

  5. Alkene group

Show answer
Correct Option: C
Explanation:

Yes, it is correct, as C is attached to halogens with single bond to give a halo hydrocarbon.

Which of the following elements has four shells?

  1. Lithium

  2. Oxygen

  3. Carbon

  4. Neon

  5. None of these

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer. All the above given elements belong to 2nd period. Hence, have two shells.

On which of the following factors did Mendeleev base his periodic table? (a) Atomic radius of the elements. (b) The physical properties of elements. (c) The chemical properties of the elements. (d) The metallic characters of elements.

  1. Only a

  2. Only b

  3. Only d

  4. Both a and d

  5. Both b and c

Show answer
Correct Option: E
Explanation:

Yes, it is correct. It was based on both physical and chemical properties of the elements.

A student was asked to smell a chemical in a test tube. His answer was acetic acid. According to him, the chemical smelled like ___________.

  1. vinegar

  2. rose

  3. burning plastic

  4. rotten egg

  5. sweet fruit

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Acetic acid smells like vinegar.

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