In 1869 Mendeleev put forward his periodic law about
A. Atomic Number
B. Chemical Properties
C. Physical Properties
D. Atomic Properties
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The main source of chemicals which are used in industries is
A. Coke
B. peat
C. Coal tar
D. Liquefied Petroleum Gas
Photo-oxidation is
S. Photo respiration
B. Photolysis
C. Light and oxygen induced breakdown
D. All of the above
Which of the following gases is not a noble gas?
A. Zenon
B. Argon
C. Helium
D. Chlorine
Liquids transmit pressure equally in all directions. This is known as
A. Boyle-Pascal's Law
B. Pascal's Law
C. Archimedes' Principle
D. None of the above
Soil is formed from the parent rock material by
A. Chemical decomposition
B. Physical decomposition
C. Biological decomposition
D. All of the above
The exhaled air contains
A. Carbon dioxide only
B. A mixture which has more carbon dioxide than oxygen
C. A mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
D. A mixture of carbon dioxide and nitrogen
The refrigerant commonly used for domestic refrigerators is
A. Alcohol
B. Ammonia
C. Neon
D. None of the above
All transition elements are
A. Gases
B. Metals
C. Nonmetals
D. Metalloids
In group electron affinity values decreases from top to bottom because
A. Atomic size normal
B. Atomic size increases
C. Atomic size decreases
D. Atomic size same