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Subjects

Science

Chemical Reactions and Equations

रासायनिक अभिक्रियाएँ और समीकरण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, this topic introduces chemical reactions as changes that form new substances. Students learn to identify reactants and products, represent reactions through word and chemical equations, and write balanced equations using correct chemical formulae while following the law of conservation of mass.

Practice questions

Which statement best explains the scientific need for a balanced chemical equation?Why is changing subscripts considered a serious error while balancing a chemical equation?What is the main difference between a skeletal equation and a balanced equation?If the reactants and products are correct but the atoms of one element are unequal, what is the conclusion?How many total atoms are present in three water molecules?What will be the ratio of magnesium atoms to oxygen atoms in five formula units of magnesium oxide?Cleaning magnesium ribbon before burning removes which obstacle?How is burning of magnesium both combination and oxidation at the same time?What are the product and energy change when water is added to calcium oxide?When calcium carbonate is heated a solid and a gas are formed. What type of reaction is this?Which is the correct pair of solid residue and gas in decomposition of calcium carbonate?Turning lime water milky is a strong experimental indication for which gas?What is the correct set of brown gas and colourless gas formed on heating lead nitrate?In thermal decomposition of lead nitrate the yellow solid residue is of which substance?Why is it wrong to consider the brown gas in lead nitrate experiment as oxygen?Why does grey colour appear when silver chloride is kept in light?Sensitivity of silver bromide to light is related to which use?What is the most suitable reason for storing silver salts in dark coloured bottles?In electrolysis of water, if hydrogen is thirty-six millilitres, what will be the expected volume of oxygen?What is the identity of the gas formed at the anode during electrolysis of water?