(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
88 constellations are officially recognized by the International Astronomical Union (IAU). A constellation is a group of stars that appears to... View Article
Answer: (c) FCH2COOH For the most part strong acids have ions in solution, so bonds holding H and A together must be weak. Strong acids... View Article
(d) Argon Inert gas like, Argon is used in electric bulbs. Argon gas is widely used for filling up incandescent and fluorescent light bulbs... View Article
(a) Rat trap Rat Traps do not cause disease to the crop. A plant disease is defined as any factor that prevents a plant from performing to its... View Article
(d) Brass Brass is an alloy of copper and zinc. Brass is an alloy of copper and zinc. The combination of these metals makes the brass solid... View Article
(a) Tapi The Tapi rises in the Satpura ranges, in the Betul district of Madhya Pradesh. The river also flows in a rift valley parallel to... View Article
