Chemistry 9 Chapter 1 Practice Test 2

White lead is a pigment used by artists for centuries, the metal Pb in the compound is extracted from its ore, galena (PbS).

Chlorofluorocarbon compounds are responsible for the depletion of ozone layer.

Gases can be compressed by applying pressure.

Hair contain a special class of proteins called keratins, which are present in nails and wool. Proteins contain chains of C-atoms.

Photosynthesis produces glucose and oxygen from carbon dioxide and water in presence of chlorophyll and sunlight.

Ammonia is a colourless gas with a pungent irritating odour. It is highly soluble in water.

Sulphuric acid (H₂ SO₄) is extremely corrosive to skin.

Haber’s process converts large quantities of hydrogen and nitrogen into ammonia (NH₃ ).

Acetylene is the simplest hydrocarbon that contains a carbon-carbon triple bond. Hydrocarbons are the compounds of carbon and hydrogen.

Some examples of complete protein food are meat, milk, and eggs.

α-particles (He⁺⁺) when bombard on nitrogen atom, a proton is emitted.

An analyst determines that NO₂ is responsible for acid rain.

A chemist performed an experiment to check the percentage purity of a sample of glucose (C₆ H₁₂ O₆).

Plantation helps in overcoming the greenhouse effect.

Element radium decays by emitting α-particles and is converted into another element radon.

Calorimeter is a device that measures the amount of heat, a substance absorbs on heating or emits on cooling.