Chapter 3: Fundamentals Of Chemistry For High School - Grade 9(Chemistry ) Questions and Answers

Question 1. A mixture that consists of different components is called
  1.    homogeneous mixture
  2.    heterogeneous mixture
  3.    mixture
  4.    dilute solution
Explanation:-
Answer: Option B. -> heterogeneous mixture
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. Free radicals are electrically
  1.    positively charged
  2.    negatively charged
  3.    neutral
  4.    all of above
Explanation:-
Answer: Option C. -> neutral
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. The natural force that holds together elements together is called
  1.    chemical bond
  2.    force of attraction
  3.    gravitational force
  4.    physical bond
Explanation:-
Answer: Option A. -> chemical bond
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Hair contains keratin proteins which are also present in nails and wool is an example of
  1.    Biochemistry
  2.    Inorganic chemistry
  3.    Physical chemistry
  4.    organic chemistry
Explanation:-
Answer: Option A. -> Biochemistry
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. The empirical formula for water is
  1.    CO2
  2.    HO
  3.    H2
  4.    H2O
Explanation:-
Answer: Option D. -> H2O
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. If 9.05 moles of ozone is formed in a storm then the mass of ozone is
  1.    435g
  2.    450g
  3.    434.4g
  4.    480g
Explanation:-
Answer: Option C. -> 434.4g
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Biochemistry deals with
  1.    physical changes in living organisms only
  2.    chemical changes in living organisms only
  3.    genetically changes in living organisms
  4.    physical and chemical changes in living organisms
Explanation:-
Answer: Option D. -> physical and chemical changes in living organisms
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The mass number of an atom is
  1.    number of protons only
  2.    number of neutrons only
  3.    number of electrons
  4.    number of protons and neutrons
Explanation:-
Answer: Option D. -> number of protons and neutrons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. A mole of any substance contains
  1.    6.022 * 10²² particles
  2.    6.022 * 10²³ particles
  3.    6.022 * 10²⁴ particles
  4.    6.022 * 10²⁵ particles
Explanation:-
Answer: Option B. -> 6.022 * 10²³ particles
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. Ca on losing 2 electrons becomes
  1.    Ca-2
  2.    Ca-1
  3.    Ca+2
  4.    Ca-2
Explanation:-
Answer: Option C. -> Ca+2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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