Chapter 1: Chemical Reactivity Chemistry For High School - Grade 9(Chemistry ) Questions and Answers

Question 1. Metal that difficult to oxidize are called
  1.    weak metals
  2.    strong metals
  3.    noble metals
  4.    ionic metals
Explanation:-
Answer: Option C. -> noble metals
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. On contact with oxygen, Rubidium forms
  1.    normal oxide
  2.    per oxide
  3.    super oxide
  4.    trioxide
Explanation:-
Answer: Option C. -> super oxide
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. The most metallic among the following is
  1.    Na
  2.    K
  3.    Al
  4.    B
Explanation:-
Answer: Option B. -> K
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Elements which have properties of metals and non-metals are
  1.    amorphous
  2.    crystalline
  3.    metalloids
  4.    metals
Explanation:-
Answer: Option C. -> metalloids
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. The sodium metal is soft due to
  1.    weak metallic bond
  2.    strong metallic bond
  3.    large size
  4.    small size
Explanation:-
Answer: Option A. -> weak metallic bond
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. As we move across the period from left to right, the reactivity of metals with oxygen
  1.    decreases
  2.    increases
  3.    remains same
  4.    zero
Explanation:-
Answer: Option A. -> decreases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. As we move across the period the electronegativity
  1.    decreases
  2.    increases
  3.    remains same
  4.    becomes zero
Explanation:-
Answer: Option B. -> increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. Bromine is a non-metal in
  1.    solid state
  2.    liquid state
  3.    gaseous state
  4.    plasma state
Explanation:-
Answer: Option B. -> liquid state
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. As the size of the atom increases down the group, the electro positivity
  1.    increases
  2.    decreases
  3.    remains same
  4.    none of above
Explanation:-
Answer: Option A. -> increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. As compare to beryllium, the magnesium is
  1.    large in size only
  2.    more electropositive only
  3.    less electropositive
  4.    large in size and more electropositive
Explanation:-
Answer: Option D. -> large in size and more electropositive
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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