Q. A high value of half life period of a radioactive element means
1) High instability
2) Greater stability
3) Decay with emission of β-particles only
4) Emission of α-particles only
Q. Which of the following acids is used as a dehydrating and drying agent?
1) Acetic
2) Hydrochloric
3) Nitric
4) Sulphuric
Q. The atomic number of an element is equal to the number of
1) Neutrons present in the nucleus
2) Electrons revolving around the nucleus in different orbits
3) Isotopes
4) None of these
Q. Which of the following elements has the smallest size?
1) Magnesium
2) Phosphorus
3) Chlorine
4) Aluminium
Q. Which of the following are produced by the electrolysis of brine?
1) Chlorine and sodium
2) Chlorine and sodium hydroxide
3) Chlorine, hydrogen and sodium hydroxide
4) Hydrogen and chlorine
Q. The first attempt to explain the structure of the hydrogen atom was made by
1) John Dalton
2) Albert Einstein
3) Stanislao Cannizzaro
4) Niels Bohr
Q. With respect to which element, the valency of elements corresponds to group number?
1) Hydrogen
2) Oxygen
3) Carbon
4) Helium
Q. Base forming tendency of which of the following elements is maximum?
1) Cs
2) K
3) Na
4) Ca
Q. Which of the following particles move around the nucleus of an atom and are negatively charged?
1) Protons
2) Neutrons
3) Electrons
4) None of these
Q. Of which of the following simpler particles is an atom composed of?
1) Isotopes, isobars, positrons
2) Electrons, neutrons, protons
3) Deutrons, neutrons, positrons
4) Deutrons, neutrons, protons
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