Chemistry - Single MCQs (Page 56)

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Q551. Which one of the following is not radioactive?...Q552. In isotopes the number of neutrons are?...Q553. Which of the following has highest frequency?...Q554. An element X forms an oxide XO3 What is the valency of X?...Q555. Which one is the pure element?...Q556. Which one is not metal ?...Q557. The father of modern chemistry is?...Q558. What was the fissionable material used in the bombs dropped at Nagasaki (Japan) ...Q559. In nuclear raeactors the speed of neutrons is slowed down by ?...Q560. Hydrogen bomb is based on the principle of ?...