Class X

Name the scientist who gave the Law of octaves?
  1. Mendeleev
  2. Newlands
  3. Dalton
  4. Döbereiner
Which is not true about the noble gases?
  1. They are non metallic in nature
  2. They exist in atomic form
  3. They are radioactive in nature
  4. Xenon is the most reactive among these
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
  1. Na
  2. Mg
  3. AI
  4. Si
Which is not true about the noble gases?
  1. They are non metallic in nature
  2. They exist in atomic form
  3. They are radioactive in nature
  4. Xenon is the most reactive among these
Identify the wrong sequence of the elements in a group
  1. Ca, Br, Ba
  2. Cu, Au, Ag
  3. N,P, As
  4. Cl, Br, I
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