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Total Questions : 1678 | Page 47 of 168 pages
Question 461. Which of the following statements about isotopes is correct ?
  1.    Isotopes with odd atomic number are abundant
  2.    Isotopes with odd atomic number and even mass number are abundant
  3.    Isotopes with even atomic number and even mass number are abundant
  4.    Isotopes with even atomic number and odd mass no are abundant
 Discuss Question
Answer: Option C. -> Isotopes with even atomic number and even mass number are abundant
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 462. The volume occupied by 2.8 g of N2 at STP______________________?
  1.    2.24 dm3
  2.    22.4 dm3
  3.    1.12 dm3
  4.    112 dm3
 Discuss Question
Answer: Option A. -> 2.24 dm3
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 463. The number of moles of CO2 which contains 16 g of oxygen is__________________?
  1.    0.25
  2.    0.5
  3.    0.75
  4.    1
 Discuss Question
Answer: Option B. -> 0.5
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 464. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
  1.    lighter
  2.    intermediate
  3.    heavier
  4.    are collected at same time
 Discuss Question
Answer: Option A. -> lighter
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 465. How many isotopes have odd atomic number ?
  1.    154
  2.    280
  3.    86
  4.    300
 Discuss Question
Answer: Option C. -> 86
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 466. Isotopes of the same elements has__________________?
  1.    different number of protons
  2.    same number of neutrons
  3.    different number of neutrons
  4.    same mass number (nucleon number)
 Discuss Question
Answer: Option C. -> different number of neutrons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 467. Which of the following is not a macromolecule ?
  1.    sand
  2.    haemoglobin
  3.    diamond
  4.    maltose
 Discuss Question
Answer: Option D. -> maltose
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 468. Percentage of calcium in calcium carbonate is___________________?
  1.    80%
  2.    30%
  3.    40%
  4.    20%
 Discuss Question
Answer: Option C. -> 40%
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 469. Mostly elements have fractional atomic masses because of______________________?
  1.    mass of an atom itself is in fraction
  2.    atomic masses are average masses of isobars
  3.    atmoic masses are average masses of isotopes proportional to their relative abundance
  4.    atmoic masses are average masses of isotopes
 Discuss Question
Answer: Option C. -> atmoic masses are average masses of isotopes proportional to their relative abundance
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 470. The properties of an element mosly corresponds to that isotope which has greater_________________?
  1.    Mass number
  2.    Atomic mass
  3.    Relative abundance
  4.    all of the above
 Discuss Question
Answer: Option C. -> Relative abundance
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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