Entry Test MCQ :: Basic Concept
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1. |
Diameter of an atom is in the order of |
Answer: Option C
Explanation:
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2. |
Which of the following are isoelectronic species? |
A. |
H+ H H- |
B. |
Li+ Na+ K+ |
C. |
C1- Br- I |
D. |
F- Ne Na+ |
Answer: Option D
Explanation:
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3. |
Mass spectrometer is used to determine Mass number of isotopes and |
A. |
Atomic number |
B. |
Relative abundance |
C. |
Electronic configuration |
D. |
All of the above |
Answer: Option B
Explanation:
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4. |
Molecular ions are formed by passing |
A. |
High energy electron beam |
B. |
? - particle |
C. |
X-rays |
D. |
All of the above |
Answer: Option D
Explanation:
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5. |
The number of peaks obtained in mass spectrometry shows |
A. |
Relative abundance |
B. |
Average mass of element |
C. |
Number of isotopes |
D. |
Relative isotopic mass |
Answer: Option C
Explanation:
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6. |
Empirical formula of chloroform is |
Answer: Option D
Explanation:
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7. |
Which one is true about isotope? |
A. |
Same number of neutrons |
B. |
Same mass number |
C. |
Same physical properties |
D. |
Same chemical properties |
Answer: Option D
Explanation:
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8. |
Molecular mass of water (18g) means |
A. |
1-mole molecules of water |
B. |
1-gram molecule of water |
C. |
3-gram atoms |
D. |
all |
Answer: Option D
Explanation:
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9. |
Which of the following ion formation is always exothermic? |
A. |
Uni-negative |
B. |
Uni-positive |
C. |
Di-negative |
D. |
Di-positive |
Answer: Option A
Explanation:
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10. |
Which of the following statements about isotopes is correct? |
A. |
Isotopes with odd atomic number are abundant |
B. |
Isotopes with odd atomic number and even mass number are abundant |
C. |
Isotopes with even atomic number and even mass number are abundant |
D. |
Isotopes with even atomic number and odd mass no are abundant |
Answer: Option C
Explanation:
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