8th Class Science Materials : Metals and Non-metals Question Bank

done Metals and Non Metals Summative Subjective Problems Total Questions - 3

• question_answer1)
  Which of the following statement (S) are true? (a) Among all the naturally occurring elements, around eighty percent are metals (b) Non-metals are more abundant than metals. (c) Sodium and potassium are soft like wax. (d) Bromine is a reddish brown liquid at room temperature.
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• question_answer2)
  \[2X+2Y\xrightarrow{{}}2XOH+{{H}_{2}};\] \[S+{{O}_{2}}\xrightarrow{{}}Z;\,\,Z+Y\xrightarrow{{}}P\] Identify X, Y, Z and P

  X	Y	Z	K
  (a) Na	\[{{H}_{2}}O\]	\[{{S}_{2}}O\]	\[{{H}_{2}}S{{O}_{3}}\]
  (b) K	\[{{H}_{2}}O\]	\[{{S}_{2}}O\]	\[{{H}_{2}}S{{O}_{3}}\]
  (c) Na	\[{{H}_{2}}O\]	\[{{S}_{2}}O\]	\[{{H}_{2}}S{{O}_{4}}\]
  (d) K	\[{{H}_{2}}O\]	\[{{S}_{2}}O\]	\[{{H}_{2}}S{{O}_{4}}\]

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• question_answer3)
  Which of the following is allotropic forms of phosphorus (a) Red phosphorus (b) White phosphorus (c) a - black phosphorus (d) b - black Phosphorus
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