Question : Which of the following is radioactive?
Option 1: Helium
Option 2: Sodium
Option 3: Thorium
Option 4: Platinum
Correct Answer: Thorium
Solution : The correct option is Thorium.
Thorium, with the chemical symbol Th and atomic number 90, is a metallic chemical element that emits relatively little radioactivity. Both French scientist Marie Curie and German chemist Gerhard Carl Schmidt independently discovered thorium's radioactivity in 1898. It is a radioactive metal that is present in nature in trace amounts.
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Question : Which of the following is not a food preservative?
Option 1: Aqua regia
Option 2: Vinegar
Option 3: Sodium chloride
Option 4: Sodium nitrite
Question : Which of the following is a radioisotope of hydrogen?
Option 1: Xenon
Option 2: Technetium
Option 4: Tritium
Question : Which of the following elements is a member of the actinoid series?
Option 1: Magnesium
Option 2: Lanthanum
Option 3: Lutetium
Option 4: Thorium
Question : Which of the following is not a noble gas?
Option 2: Hydrogen
Option 3: Neon
Option 4: Argon
Question : Which among the following combinations is present in higher amounts in hard water?
Option 1: Calcium and Magnesium
Option 2: Calcium and Sodium
Option 3: Sodium and Magnesium
Option 4: Sodium and Manganese
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