Home > General Knowledge Questions Answers > Chemistry Questions Answers
Chemistry Questions Answers
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of—
air
hydrogen
hydrogen and oxygen
water vapour
air
Which one of the following is a cause of acid rains?
Ozone
Ammonia
Sulphur dioxide
Carbon monoxide
Sulphur dioxide
The desirable range of pH for drinking water is—
6·5 to 8·5
5·0 to 6·5
6·5 to 7·0
7·0 to 8·5
6·5 to 8·5
The principal use of hydrofluoric acid is—
in etching glass
as a bleaching agent
as an extremely strong oxidizing agent
in the preparation of strong organic fluorine compounds
in etching glass
The compound C6H12O4 contains
22 atoms per mole
twice the mass percent of H as compared to the mass percent of C
six times the mass percent of C as compared to the mass percent of H
thrice the mass percent of H as compared to the mass percent of O
six times the mass percent of C as compared to the mass percent of H
The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as—
Avogadro's hypothesis
Gay-Lussac's hypothesis
Planck's hypothesis
Kirchhoff's theory
Avogadro's hypothesis
Which of the following is sulphur containing amino acid?
Tryptophan
Proline
Methionine
Aspartic acid
Methionine
Which among the following is known as laughing gas?
Nitrous oxide
Nitric oxide
Nitrogen dioxide
Nitrogen pentoxide
Nitrous oxide
The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is —
Califonrium
Cesium
Calcium
Cerium
Cesium
Which of the following elements is a semi-conductor?
Aluminium
Silicon
Silver
Lead
Silicon