Chemistry Test - 9

• pressure exerted by the gas
• volume occupied by the gas
• temperature of the gas

Neutral oxides are oxides which are neither acidic nor basic.

When Sulphur dioxide is dissolved in water (neutral medium) form sulphurous acid (H₂SO₃) which became able to donate hydrogen ion.

Predicted theoretically in 1935 by the Japanese physicist Yukawa Hideki, the existence of mesons was confirmed in 1947 by a team led by the English physicist Cecil Frank Powell with the discovery of the pi-meson (pion) in cosmic-ray particle interactions.

Rain water is considered the purest form of water. Impurities and salts present in water on earth are left behind during vaporisation by the sun. However, the rain water we receive on earth is not necessarily pure, as it brings down impurities and particles present in the atmosphere along with it.

The liquid tends to have minimum surface area due to surface tension. Small liquid drop from spherical shape because it wants to have less area due to the application of the surface tension.

Butter is a gel which is a colloidal solution in which dispersed phases liquid and dispersed medium is solid.

pH decreases with increase in temperature. But this does not mean that water becomes more acidic at higher temperatures.

Bauxite: Of all the aluminum ores, bauxite is the chief ore of aluminum.

Chalcopyrite is the chief ore of copper.

Most common silver-bearing minerals recovered by flotation are argentiferous galena, native silver, argentite (Ag₂S) and tetrahedrite (Cu, Fe, Ag) Sb₄S₃).

Halogen element, any of the six non-metallic elements that constitute Group 17 (7a) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).

Formula of Urea is CO(NH₂)₂

60 gm of urea contains 12 g of carbon-

Mass percentage of Carbon in$Urea=molarmassofcarbonmolarmassofurea\times 100$

$=1260\times 100$

$=20\%$