Question : Match the following with the correct response:
a. 1-D, 2-A, 3-C, 4-B
b. 1-C, 2-B, 3-D, 4-A
c. 1-B, 2-D, 3-A, 4-C
d. 1-A, 2-C, 3-B, 4-D
Answer : A
Explanation: NaCl has ionic bonds between the sodium ion and the chlorine ion. Ammonia has polar covalent bonds between nitrogen atom and hydrogen atoms. Nitrogen molecule has non-polar covalent bonds between the two nitrogen atoms since the two atoms are alike. C60 is a member of fullerenes (Allotropes of carbon). Buckminsterfullerene contains a cluster of 60 carbon atoms joined together to form spherical molecules.
Question : Diamond is not a good conductor of electricity because:
a. It is not soluble in water.
b. It is very hard.
c. It has no free electrons to conduct electric current.
d. Its structure is very compact.
Answer : C
Explanation: Diamond is not a good conductor of electricity because it has no free electrons in its structure (like graphite) to conduct electric current.
Question : Substance ‘X’ is formed by the reaction of carboxylic acid and alcohol. It is used in making ice creams, cold drinks, perfumes and in flavoring agent. Name ‘X’.
a. Aldehyde
b. Alkyne
c. Ester
d. Ketone
Answer : C
Explanation: Substance X is an ester. The reaction in which a carboxylic acid combines with an alcohol to form an ester is called esterification. Some volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes; large quantities of ethyl acetate and butyl acetate are commercially produced for this purpose.
Very Short Answers
Question : Would you be able to check if water is hard using a detergent?
Answer : No, we can't check whether the water is hard or soft using a detergent.
Question : What are constituents of an antifreeze?
Answer : Ethylene glycol or ethanol is used as an antifreeze.
Short Answers
Question : Write the name and chemical formula of the simplest organic acid.
Answer : Formic acid is the simplest organic acid.
Question : Give names of the following:
(a) An aldehyde derived from ethane
(b) Ketone derived from butane
(c) Compound obtained by the oxidation of ethanol by chromic anhydride
Answer :
Long Answers
Question : An organic compound A is widely used as a preservative in pickles and has a molecular formula C2H4O2. This compound reacts with ethanol to form a sweet smelling compound B.
i. Identify the compound A.
ii. Write the chemical equation for its reaction with ethanol to form compound B.
iii. How can we get compound A form B?
iv. Name the process and write corresponding chemical equuation.
v. Which gas is produced when compound A reacts with washing soda? Write the chemical equation.
Answer :
i. A is ethanoic acid (CH3COOH). Commonly, known as acetic acid. Its 5 % solution in water is used to prepare vinegar, which is used as preservatives for pickles.
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