CBSE Class X – Science Chemistry Exam (Full Syllabus)

The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is 2:1 by volume. In a decomposition reaction, a compound is broken down into its simpler forms. During electrolysis, water is broken down into oxygen gas and hydrogen gas due to the passage of electric current through it.

oxidation is the term of the adding oxygen to a compound hence it is the gain of oxygen.

Baking powder is a mixture of sodium hydrogen carbonate and tartaric acid NaHCO₃ + H+ → CO₂ + H₂O + Sodium salt (from tartaric acid) of acid Carbon dioxide (CO₂) produced during reaction can cause bread or cake to rise and makes Baking powder, tartaric acid neutralises the salt and cake does not taste bitter.

hydrogen-containing compound such as glucose is not categorized as acid because it does not produce hydrogen ions or some other ions, when dissolved in water, and consequently does not conduct electricity

C₂H₅OH is not a base. C₂H₅OH is an organic compound with –OH functional group that is known as alcohol

The element with electronic confguration 2, 8 has octet confguration, so it must be an inert gas, i.e., neon, which is placed in group 18.

Reaction between an acid and an alcohol results in the formation of ester, and the reaction is named as esterification.

The major constituent of the liquefied petroleum gas is butane.

Ethanoic acid when treated with baking soda (Sodium hydrogencarbonate) gives brisk effervescence of Carbon dioxide gas.

Cyclobutane is a cyclic hydrocarbon consisting of four carbon atoms where each carbon atom is attached to the two other carbon atoms and two hydrogen atoms.

Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), for that reason their ions are free to move from place to place. In solid state, no free or mobile ions are available for conducting electricity

Lead readily reacts with the atmosphere.it conducts heat very slowly.

When calcium is treated with water, it reacts vigorously with water and to produce a cloudy white precipitate of calcium_x000D_hydroxide and hydrogen gas is released as bubbles