Question : The mass number of potassium is:
Option 1: 39
Option 2: 40
Option 3: 38
Option 4: 37
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Correct Answer: 39
Solution : The correct option is 39.
Since potassium (symbol K) has several isotopes, the mass number of potassium can change. Atoms of the same element that differ in their neutron counts but have the same number of protons, which characterises the elements, are called isotopes.
Potassium-39 (K-39) is the most prevalent isotope of potassium, containing 19 protons and 20 neutrons.
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Question : What is the chemical name of saltpetre?
Option 1: Potassium nitrate
Option 2: Potassium manganite
Option 3: Lead nitrate
Option 4: Lead sulphate
Question : Direction: In the following question, select the related number from the given alternatives.
12 : 27 :: 8 : ?
Option 1: 36
Option 2: 38
Option 3: 40
Option 4: 23
Question : If $x \%$ of $280=15 \%$ of $240+20 \%$ of $310$, then the value of $x$ is:
Option 1: 38
Option 2: 35
Option 3: 30
Option 4: 40
Question : Find the value of: $\sqrt[3]{–13824}$
Option 2: –38
Option 3: 24
Option 4: –24
Question : The mass number of titanium is:
Option 1: 44.56
Option 2: 49.82
Option 3: 41.33
Option 4: 47.78
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