46. Baking soda is a mixture of:
a) Sodium carbonate and acetic acid
b) Sodium carbonate and tartaric acid
c) Sodium hydrogen carbonate and tartaric acid
d) Sodium hydrogen carbonate and acetic acid
c) Sodium hydrogen carbonate and tartaric acid
Explanation:
The question likely refers to baking powder, which is a mixture of baking soda (sodium hydrogen carbonate) and a mild acid like tartaric acid.
47. Which one of the following types of medicines is used for treating indigestion:
a) Antibiotic
b) Analgesic
c) Antacid
d) Antiseptic
c) Antacid
Explanation:
Antacids are basic substances that neutralize the excess hydrochloric acid in the stomach that causes indigestion.
48. Adding common salt to water will result in:
a) Increase in pH of water
b) Decrease in pH of water
c) No change in pH of water
d) Water gets warm
c) No change in pH of water
Explanation:
Common salt (NaCl) is a neutral salt, so dissolving it in water does not change the pH.
49. The IUPAC name of the given compound is:
CH3
CH3 —–|——CH3
CH3
a) 2-methyl butane
b) 2, 2dimethyl butane
c) 2,2-dimethyl propane
d) 2-ethyl, 2-methyl propane
c) 2,2-dimethyl propane
Explanation:
The longest carbon chain is three atoms (propane), with two methyl groups attached to the second carbon atom.
50. Which of the following is used for dissolution of gold
a) Hydrochloric acid
b) Sulphuric acid
c) Nitric acid
d) Acquaragia
d) Aqua regia
Explanation:
Aqua regia, a mixture of concentrated nitric and hydrochloric acids, is one of the few reagents that can dissolve noble metals like gold.
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