PG TRB Model Question Paper for Chemistry with Answer - 1
Who discovered neutrons?
The first metal used by man was
Which one of the following chemicals helps in fruit ripening?
The energy of an electron in an orbit was calculated by
(B) Neils Bohr
(C) John Dalton
(D) J.J. Thomson
Which of the following types of materials act as effective catalysis?
(A) Alkali metals
(B) Transition metals
(C) Alkaline earth metals
(D) Radioactive metals
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