Chemistry and Indian History Quiz

Jayadeva, a 12th-century Sanskrit poet, composed the Gita Govinda, a lyrical poem celebrating the divine love between Radha and Krishna. It was composed at the Jagannath temple in Puri under the patronage of King Lakshman Sen of Bengal.

Iltutmish (1211-1236), the third Mamluk Sultan of Delhi, formally institutionalized the Iqta system in India. This land revenue system assigned territorial rights to military officials in exchange for service, becoming a cornerstone of Delhi Sultanate administration.

Prithviraj Chauhan, also known as Prithviraj III, ruled the Chauhan dynasty of Ajmer and Delhi from 1178-1192 CE. He is famous for his battles against Muhammad Ghori and is celebrated in Rajput folklore and Prithviraj Raso.

The Dilwara Jain temples at Mount Abu are renowned for their exquisite marble architecture. Built between 11th-13th centuries CE, these temples feature intricate carvings on white marble and are considered masterpieces of Western Indian architectural style.

The Arya Samaj, founded by Swami Dayananda Saraswati, launched and supported the Shuddhi movement in the early 20th century. This movement aimed to reconvert Hindus who had converted to other religions back to Hinduism through purification ceremonies.

Lord Ripon's Local Self Government Act of 1882 introduced significant reforms by establishing elected local bodies and giving Indians greater control over local affairs. This landmark legislation was a major step toward self-governance during the British colonial period.

Diamond is a crystalline form of carbon where atoms are arranged in a tetrahedral lattice structure. This makes it the hardest known natural substance and one of the well-known allotropes of carbon, along with graphite.

Air is a homogeneous mixture of several gases, primarily nitrogen (78%) and oxygen (21%), along with trace amounts of argon, carbon dioxide, and other gases. Unlike compounds, mixtures retain the individual properties of their components and can be separated by physical means.

Helium is used to fill balloons because it is much lighter than air and non-flammable, making it safe for inflating balloons. Unlike hydrogen, helium is inert and does not pose a fire risk.

Chlorofluorocarbons (CFCs) were widely used as refrigerants in refrigerators and air conditioning systems. They were phased out globally after being identified as major contributors to ozone layer depletion.

Silicon carbide is an extremely hard material (hardness ~9.5 on Mohs scale) and is widely used as an abrasive for cutting and polishing very hard substances including metals, ceramics, and other materials. It is also used in making cutting tools and grinding wheels.

All acids contain hydrogen ions (H+) as their essential component. When an acid dissolves in water, it releases hydrogen ions, which is what gives acids their characteristic properties like sour taste and ability to turn litmus red.

Tetraethyl lead was used as an additive in petrol (gasoline) to improve engine performance by preventing knocking. It was phased out due to its toxicity and environmental pollution, replaced by unleaded petrol alternatives.

Bromine is the only non-metal that exists as a liquid at room temperature (25°C). It has a characteristic reddish-brown color and strong odor, making it easily distinguishable from other halogens which are gases (chlorine) or solids (iodine).

Radium is primarily obtained from pitchblende (also known as uraninite), which is a uranium-rich ore. The Curies discovered radium by processing tons of pitchblende ore to isolate this radioactive element.

Laughing gas is the common name for nitrous oxide (N2O), so called because it induces euphoria and laughter when inhaled. It is used in medicine and dentistry as an anesthetic and analgesic.

Diamond is an element because it consists of only one type of atom - carbon atoms arranged in a specific crystal structure. Ruby, Sapphire, and Emerald are all minerals composed of multiple elements (corundum with chromium/traces for Ruby, corundum with iron/titanium for Sapphire, and beryl with chromium for Emerald).

Sodium is a highly reactive alkali metal that reacts vigorously with air (oxygen and moisture) and can explode in contact with water. To prevent this reaction, sodium metal is stored under kerosene oil, which creates an inert environment by preventing contact with air and moisture. Kerosene does not react with sodium and provides a protective layer. Water, alcohol, and petrol are all unsuitable - water and alcohol would react dangerously with sodium, while petrol is too volatile.

Non-stick cooking utensils are coated with Teflon (polytetrafluoroethylene or PTFE), a polymer with excellent non-stick properties. Teflon has a very low coefficient of friction, is chemically inert, and can withstand high cooking temperatures. The coating prevents food from sticking to the utensil surface, making cooking and cleaning easier. PVC, polystyrene, and black paint are not used for non-stick coatings as they lack these properties and may not be food-safe at high temperatures.