Tag: science & technology

Vitamin B12 (cobalamin) has the most complex chemical structure of all vitamins and contains cobalt, giving it the name cobalamin. Other vitamins like A, B1 (thiamine), and C have simpler structures and don't contain rare elements like cobalt.

Beriberi is a nervous system disorder caused by thiamine (vitamin B1) deficiency. This vitamin is essential for carbohydrate metabolism and proper nerve function. Symptoms include muscle weakness, nerve damage, and cardiovascular problems. The other options (vitamins D, C, E) are not associated with beriberi - their deficiencies cause different conditions like rickets, scurvy, or neurological issues respectively.

Hydrochloric acid is represented by HCl, consisting of hydrogen and chlorine. In aqueous solution, it dissociates into H+ and Cl- ions, making it a strong acid commonly used in laboratories and industrial processes.

Nitrous oxide (N2O) is commonly called laughing gas due to its euphoric effects when inhaled. It was discovered in 1772 and has been used as an anesthetic and analgesic in medical and dental procedures for over 150 years.

The brown ring test is a qualitative test for detecting nitrate ions (NO3-). When concentrated H2SO4 is carefully added to a mixture of the test solution and freshly prepared FeSO4 solution, a brown ring of [Fe(NO)(H2O)5]2+ forms at the junction of the two liquids, confirming nitrate presence.

Sodium is a soft, silvery-white alkali metal in group 1 of the periodic table. Unlike gases or vapours, it exists as a solid metal at room temperature with characteristic metallic properties like electrical conductivity and malleability.

Gold's chemical symbol Au comes from the Latin word 'aurum' meaning gold. Silver is Ag (from 'argentum'), Antimony is Sb (from 'stibium'), and Gadolinium is Gd. Au is the universally accepted symbol in chemistry.

Oxygen has an atomic mass of approximately 16 atomic mass units (amu). The atomic number of oxygen is 8, but the atomic weight (mass) is 16 because oxygen-16 is its most abundant isotope. Option A confuses atomic number with atomic mass.

As of the most recent IUPAC recognition, there are 118 confirmed elements in the periodic table, with element 118 being Oganesson (Og). The periodic table was completed with the synthesis of the heaviest elements up to 118.