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
The ability to attract shared pair of electron is called
A. Electron affinity
B. Electronegativity
C. Ionization energy
D. Shielding effect
The shielding effect across the period
A. Increase
B. Decrease
C. Moderate
D. Same
According to Moseley the chemical properties of elements are the periodic function of their
A. Atomic size
B. Atomic mass
C. Atomic radius
D. Atomic number
What is the name of material used in screen Rutherford atomic model?
A. Aluminium foil
B. Zinc sulphide
C. Sodium sulphide
D. Aluminium sulphide
Which rays are used for sterilization of medical instruments?
A. Gamma rays
B. Beta rays
C. Alpha rays
D. X rays
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