2. Convert 23mmHg to atm.
0.03026 0.303 0.030 None of these All of these
3. Which of these has 23 protons?
Scandium Titanium Vanadium Chromium None of these
4. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)
5. Which of these has a negative charge?
Protons Neutrons Electrons Quarks None of these
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