Allotropy is a behavior exhibited by certain chemical elements that can exist in two or more different forms, known as allotropes of that element. In each allotrope, the element's atoms are bonded together in a different manner. Thus, allotropes are different structural modifications of an element.

Tritiumis a radioactive isotope of hydrogen. The nucleus of tritium contains one proton and two neutrons.

Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. A Zirconium is a chemical element with symbol Ζρ and atomic number 40.

Tartaric acid is a white crystalline diprotic acid. This aldaric acidoccurs naturally in many plants, particularly grapes, bananas, and tamarinds.

Litmus is a water soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. Blue litmus paper turns red under acidic conditions.
Hence option A is the right answer.

Cement is a binder, a substance that sets and hardens and can bind other materials together. It does not contain Sulphur. The chemical formula of cement varies as Cement is a mixture of different compounds. It consists of Calcium oxide(CaO),Silicon dioxide(SiO2),Aluminum oxide(Al2O3),Iron   oxide(Fe2O3),Water(H2O),Sulfate(SO3).

Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion.

A mineral is a naturally occurring substance that is solid and inorganic representable by a chemical formula, usually abiogenic and has an ordered atomic structure.

Calcination is used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition, phase transition, removal of a volatile fraction.

Aluminium oxide is a chemical compound of Aluminium and oxygenwith the chemical formula Al₂O₃ .An amphoteric compound is a molecule or ion that can react as an acid as well as a base.