(d) Buna-S Buna-S is a copolymer of butadiene and styrene. A copolymer is a polymer that is made up of two or more monomer species. Many... View Article
Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a method of achieving stability. The... View Article
Some leaves of a tree get detached when we shake their branches vigorously because branches come in motion, while the leaves tend to remain at... View Article
(d) Uracil DNA does not contain uracil. RNA contains Uracil in place of Thymine, which is the pyrimidine base of DNA. DNA and RNA are long... View Article
The photoreceptor cells of the retina sensitive to colour are Cones. Cones are the nerve cells that are more sensitive to bright light. They help... View Article
(c) MgO A base like magnesium oxide (MgO) is insoluble in water. In the compound magnesium oxide, there exists a strong attraction between the... View Article
A system that can exchange energy with the surroundings but not mass is called a closed system. When tea is placed in a closed vessel, only... View Article
The correct option iv) K The Atomic radii increases down the group as the number of shells increase down the group. Atomic size decreases... View Article
Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur. Chemosynthetic... View Article
(iv) ZnO Zinc oxide shows acidic as well as basic behaviour. Amphoteric oxides are compounds of oxygen that exhibits both acidic as well as... View Article
(c) Glass Sugar, graphite and salt three are crystalline so they will have a sharp melting point while glass is amorphous so it will melt over a... View Article
(i) Cu Copper (Cu) comes below hydrogen in the activity series. Hydrogen cannot be displaced from metals that are below it in the reactivity... View Article
(c) Mercury Mercury is a relatively poor conductor of heat. The materials which cannot transfer heat are poor conductors. Mercury is a dense,... View Article
(iii) U Uranium (U) belongs to the Actinides series of elements. The second series of f block elements are called actinides and involve... View Article
(c) Oxygen During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water... View Article
Glucose is a vital energy source for all organisms. The nutrition consumed is converted into carbohydrates, in which glucose is the key... View Article
(i) B Because of their high ionisation energies, all the elements of Group 13 form covalent compounds. But due to their high enthalpies of... View Article
