How does an electric iron work? Answer: An electric iron is one of the devices that work by using the thermal effect of electric current. In electric irons, coils of nichrome wire are wound over a triangular structure of mica. The coil is wrapped with two sheets of mica for insulation. It is kept in […]
Are Double Pane Windows Soundproof? Answer: If you use two panes of glass instead of one in the glass windows of the house, the sound outside the house is not heard by the person inside the house. Because, if there are two panes in the window, the air is trapped between the two panes. As
Result of reducing the length of the nichrome wire of the heater By shortening the length of the nichrome wire in the heater, the resistance of the wire is reduced. Because resistance is proportional to length. But, as the potential difference in the electric line remains constant and the resistance of the wire decreases, the
What happens if the nichrome wire of the heater is shortened in length? Read More »
Q. What is the resonance of sound? What measures should be taken to stop resonance? Resonance of sound When sound is heard in an empty hall or a large room, the sound is reflected repeatedly from the walls, floor or ceiling of the room, creating a humming sound. This sound is heard for a while
Pure sulfuric acid is a colourless, odourless, oil-like liquid. This acid is heavier than water and its affinity for water is very high. This acid mixes with water in any proportion and produces a lot of heat when mixed with water. Aqueous solutions of sulfuric acid conduct electricity. After going through this post, you will
Presence of Hydrogen, Oxygen and Sulfur in Sulfuric Acid Read More »
Q. Write the principle of industrial preparation of nitric acid or preparation of nitric acid from ammonia with equations. Answer: Industrial Preparation of Nitric Acid | Preparation of Nitric Acid from Ammonia German scientist Oswald invented an industrial method of preparing nitric acid from ammonia. There are three stages in this method. In the first
How to identify Nitric acid? Detection of nitric acid: When some copper ingot mixed with concentrated nitric acid is heated in a test tube, brown nitrogen dioxide gas is evolved and the solution in the test tube turns blue due to the formation of copper nitrate. Cu + 4HNO3 = Cu (NO3)2 + 2NO2 ↑
A small amount of dilute Nitric acid (HNO3) is added to a test tube with freshly prepared Ferrous sulphate solution. The test tube is cooled with cold water. Now concentrated sulfuric acid (H2SO4) from another test tube is poured very slowly down the tube into the first test tube. H2SO4 is heavy and sinks to
Can dilute HCL solution be kept in a copper vessel? Answer: Copper ranks below hydrogen in the electrochemical class. So copper is less electropositive than hydrogen. Therefore copper cannot replace hydrogen in dilute hydrochloric acid (HCL). That is, copper does not react with dilute hydrochloric acid. So dilute hydrochloric acid can be kept in copper
Can dilute HCL solution be kept in a copper vessel? Read More »
How does H2SO4 damage buildings made of Marble? Buildings made of marble stone can be damaged by exposure to Sulfuric acid (H2SO4). Marble stone is calcium carbonate (CaCo3). Sulfuric acid (H2SO4) reacts with calcium carbonate to produce calcium sulphate (CaSO4), carbon dioxide and water. As a result, buildings made of marble stone are damaged by
