Which is the most dangerous acid?
A) Sulphuric acid B) Hydrochloric acid C) Hydrofluoric acid D) All of these
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Which acid is produced in stomach?
A) Sulphuric acid B) Citric acid C) Hydrochloric acid D) Formic acid
Bee stings contains which acid?
A) Hydrochloric acid B) Sulphuric acid C) Formic acid D) Citric acid
How many elements are natural elements?
A) 92 B) 90 C) 94 D) 96
Which is the lightest metal in the world?
A) Aluminum B) Platinum C) Iron D) Lithium
Which is universal solvent?
A) Honey B) Milk C) Water D) None of these
How many elements are discovered in the world?
A) 112 B) 115 C) 118 D) 116
When was submarine invented?
A) 15th century B) 18th Century C) 17th century D) 20th century
Aluminum is used mostly in what?
A) Ships B) Submarines C) Aircrafts D) None of these
Bronze is a mixture of Copper &:
A) Aluminum B) Helium C) Boron D) Tin