Answer: Pb3O4 Red lead that is produced from cinnabar is vermilion or sindoor. These cinnabar blocks are generally crushed and produced as... View Article
Answer: Polynomials are algebraic expressions that consist of variables and coefficients. Variables are also sometimes called indeterminates.... View Article
Answer: (1) X = Fe, Y = Fe2O3 The exposure of element X to moist air forms a reddish brown Y which is a new compound is formed. The reddish brown... View Article
Answer: (4) The colour of the solution changes to green We will observe a shift of colour from blue to green when immersing iron nails in the... View Article
Answer: (4) All of these Rancidity is a very particular term that refers in the most general way to the spoilage of food in such a way that it... View Article
Answer: (3) Burning of L.P.G. Fuels release heat on burning. Heat of combustion is total amount of heat released when a fuel is burnt when there... View Article
Answer: (2) White When magnesium ribbon is burnt in air, it combines with oxygen to form white powder magnesium oxide (MgO) with the release of... View Article
Answer: (d) A colourless and odourless gas is evolved. A colourless and odourless gas is produced with bubbles when diluting hydrochloric acid... View Article
Answer: Inside their bodies, fireflies create a chemical reaction that causes them to emit light. This kind of light emission is known as... View Article
Answer: (4) Yellow residue is left The evolution of brown gas, nitrogen dioxide, and a yellow residue of lead oxide results from strong heating... View Article
Answer: (4) Ag2S When placed in the air, the silver object turns black because the silver element reacts with sulphur compounds such as H2S... View Article
Answer: (4) 4 A decomposition reaction can be characterized as a type of chemical reaction in which one single compound splits into several... View Article
Answer: (2) 2 : 1 by volume The number of molecules formed by hydrogen is twice the number of molecules generated by oxygen. Therefore, water... View Article
The correct answer is (4) Helium or nitrogen Oxygen acts as an oxidizing agent. Nitrogen is less reactive than helium, and is most commonly... View Article
Answer:(3) PbSO4 A lead sulphate is a white solid that is crystalline in nature, it is a compound that does not dissolve in water, and when... View Article
Answer: For their nutrition, plants absorb decayed matter from the soil and are eaten for their survival by plant-eating animals. For their... View Article
Answer: 1,08,000 In the Indian numbering system, the term lakh and crore are expressed as 1 lakh = 1,00,000 1 crore = 1,00,00,000 Indian... View Article
Answer: The reciprocal of 1 is 1. A Reciprocal is described as the inverse of a value or a number. If n is a real number, then its reciprocal... View Article
Answer: Lemon - The lemon contains citric acid juice of about 5 to 6 percent, with a pH of about 2.2, which makes it taste sour. The unique sour... View Article