Explanation

• Over-eating can lead to obesity.
• While consuming spicy food can irritate the stomach lining.
• It potentially causing ulcers in susceptible individuals.

Explanation

• Copper-64 is used for the diagnosis and treatment of Wilson's disease.
• It helps in imaging and radiotherapy due to its radioactive properties.
• It allowing for the assessment of copper metabolism and liver function in affected patients.

Explanation

The correct answer is: No change in composition

• A chemical change involves a transformation of one or more substances into new substances, which means a change in composition.

The signs of chemical change:

• Release of gas
• Change in color
• Change in temperature
• Change in smell
• Production of a new material

Explanation

• Carbon Dating is one of the methods to calculate the age of fossils. It is based on the principle of Radioactivity.
• Radioactive isotope: Carbon-14 (¹⁴C)
• Half-life: 5,730 years
• Developed by: Willard Libby
• Introduced: 1949
• Dating range: Up to 50,000 years

Last verified on 20-07-2026

Explanation

• Cobalt-60 is used in radiotherapy to stop the growth of cancer cells.
  
• It emits gamma rays that target and destroy malignant cells in cancer treatment.

Explanation

Hydrocarbon compounds are typically derived from fossil fuels and consist of hydrogen and carbon atoms.

Examples include fuels like gasoline, natural gas, and propane, as well as waxes like candle wax and paraffin wax.

Explanation

Fertilizers are substances added to soil to provide essential nutrients for plant growth, making up for any deficiencies in the soil.

Fertilizers replenish nutrients in the soil that have been depleted by previous crops.

Types:

1. Natural fertilizers: Organic materials like manure and compost.
2. Synthetic fertilizers: Inorganic substances created for commercial use, such as ammonium nitrate or diammonium phosphate.

Explanation

• The statement "A chemical compound always contains the same elements combined together in the same proportion or ratio" is a statement of the Law of Constant Composition.
• It is also known as the Law of Definite Proportions.
• This law was first discovered by Joseph Proust in 1797.

Explanation

Isotopes are atoms of the same element (same number of protons/nuclear charge) but different masses (different number of neutrons).

Explanation

Periods in the periodic table are horizontal rows (left to right).

There are 7 periods in total.