1- Hydrogen gas is released when a metal reacts with an acid .
2- Lime water turns milky when carbon dioxide is passed due to the formation of CaCO3
3-Acids react with metal carbonates to liberate Carbon dioxide gas.
4- You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which will turn red litmus to blue. Ans-Base
5-Acids react with bases to form salt and water. This reaction is known as Neutralisation.
6- Acids have pH more than 7.
7- A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. The compound and the gas evolved are Calcium Carbonate, Carbon dioxide.
8-The milkiness (on passing excess carbondioxide gas through lime water) disappears due to the formation of Calcium hydrogen carbonate CaHCO3.
9-cyclohexane is C6H12
10-100% pure ethanol is called Absolute alcohol
11-Wohler prepared urea the first time by heating ammonium cynate.
12-Carboxylic acid containing one carbon atom is Formic acid
13-The difference in the molecular formula and molecular mass of CH4 and C2H6 is CH2 and 14u
14-Ethane and ethene can be distinguished by using Bromine water
15-silicon is a semi – metal.
16-The most metallic element in the fourth period is K.
17-Group 17 elements are also called as halogens
18-The correct order of decreasing metallic character of elements Na, Si, Cl, Mg, Al is Na> Mg> Al> Si> Cl
19-Bauxite is an are of Aluminium metal
20-A list of metals arranged in the order of their decreasing activities is known as Reactivity series.
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