Carbon Compounds and Periodic Table Classification
Carbon and its compounds, Classification of elements
Questions
Carbon can form bonds with other carbon atoms. This property of carbon is known as ___________.
- covalency
- tetravalency
- catenation
- saponification
- electronegativity difference
Alkyne hydrocarbon has at least one ______________bond.
- single
- double
- triple
- carbon-carbon
- carbon-functional group
Which of the following cations is/are found in hard water?
- Ca and Na
- Mg and Na
- Ca and Mg
- Ca, Na and Mg
- Only Na
Soap molecules form __________ with hard water.
- lather
- scum
- precipitate
- both 1 and 2
- both 2 and 3
Which of the following products are obtained when ester undergoes saponification?
- Ethanol and ethanoic acid
- Only ethanol
- Only ethanoic acid
- Scum
- Salt and water
Why are detergents preferred over soap in hard water?
- They are free flowing and easily available.
- They do not precipitate with calcium or magnesium salts in hard water.
- They change the hard water into soft water.
- They form scum, which can easily be removed.
- They have fresh odour.
What is the similarity between sodium and chlorine?
- Both are alkali metals.
- Both are halogens.
- Both have valency + 1.
- Both have 7 valence electrons.
- Both form acid on reacting with water.
Alkaline potassium permanganate on reacting with alcohol loses its pink colour, whereas on reacting with carboxylic acid it __________.
- changes to blue
- darkens to dark pink
- gets colourless
- shows no change
- changes to blue first then colourless
Which of the following factors is not responsible for the versatile nature of carbon?
- Black colour of carbon
- Stability of carbon-carbon bond
- Linking of carbon atom by single, double and triple bonds
- Property of tetravalency
- Property of catenation
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.
- only a
- both a and b
- both b and c
- both c and d
- a, b and c
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.
- Only a
- Only b
- Only c
- Both a and b
- Both b and c
Which of the following does not belong to the same homologous series?
CH4, C2H2, C3H8, C4H10, C5H12
- CH4
- C2H2
- C3H6
- C4H8
- C5H10
Which of the following functional groups of hydrocarbons does not have double bonding?
- Ketonic group
- Aldehyde group
- Halo group
- Carboxylic group
- Alkene group
Which of the following elements has four shells?
- Lithium
- Oxygen
- Carbon
- Neon
- None of these
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.
- Only a
- Only b
- Only d
- Both a and d
- Both b and c
A student was asked to smell a chemical in a test tube. His answer was acetic acid. According to him, the chemical smelled like ___________.
- vinegar
- rose
- burning plastic
- rotten egg
- sweet fruit