Aug 2025 R Chem MC

Front

What are isotopes?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number of an element and its identity.

Front

What is a metallic bond?

Back

A metallic bond is a type of chemical bond that occurs between metal atoms, characterized by a 'sea of electrons' that are free to move.

Front

What is STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, which is defined as 0 degrees Celsius (273.15 K) and 1 atmosphere (101.3 kPa) of pressure.

Front

How can solubility differentiate between NaCl and AgCl?

Back

NaCl is soluble in water, while AgCl is not, allowing for differentiation based on solubility.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

Front

What is the difference between a mixture and a pure substance?

Back

A mixture contains two or more substances that retain their individual properties, while a pure substance has a uniform and definite composition.

Front

What is the energy difference between chemical and nuclear reactions?

Back

Nuclear reactions release significantly more energy than chemical reactions when the same amount of reactant is consumed.

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the atomic mass of an element and help stabilize the nucleus.