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CHEMISTRY MCQs

Total Questions : 2589 | Page 255 of 259 pages
Question 2541. Coal is formed from
  1.    Coke
  2.    Crude oil
  3.    Compressed and hardened biomass
  4.    Deposit of animal waste
 Discuss Question
Answer: Option C. -> Compressed and hardened biomass
Question 2542. The horizontal rows of the periodic table are called
  1.    periods
  2.    columns
  3.    groups
  4.    families
 Discuss Question
Answer: Option A. -> periods
Question 2543. If a Carbon atom has 6 protons, how many electrons will it have?
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option C. -> 6
Question 2544. What is a pure substance made of two or more elements chemically combined in a set ratio
  1.    element
  2.    compound
  3.    mixture
  4.    salad
 Discuss Question
Answer: Option B. -> compound
Question 2545. The average atomic mass for silicon will be closest to
  1.    Si-28 (92% abundance)
  2.    Si-29 (5% abundance)
  3.    Si-30 (3% abundance)
  4.    All of above
 Discuss Question
Answer: Option A. -> Si-28 (92% abundance)
Question 2546. Basic unit of matter - the smallest piece of matter known
  1.    Element 
  2.    Atom
  3.    Molecule
  4.    Compound
 Discuss Question
Answer: Option B. -> Atom
Question 2547. How many protons does Carbon have?
  1.    3
  2.    4
  3.    5
  4.    6
 Discuss Question
Answer: Option D. -> 6
Question 2548. If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:
  1.    16
  2.    32
  3.    48
  4.    64
 Discuss Question
Answer: Option B. -> 32
Question 2549. Chalk and Vinegar
  1.    Compound 
  2.    Mixture 
 Discuss Question
Answer: Option A. -> Compound 
Question 2550. Carbon has 4 valence electrons which means
  1.    it can only form bonds with carbon
  2.    it is stable
  3.    it can make ionic bonds
  4.    it wants to make 4 covalent bonds
 Discuss Question
Answer: Option D. -> it wants to make 4 covalent bonds

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