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Class 10 · Science · Easy
→What type of decomposition reaction occurs when lead nitrate, eq ext{Pb(NO}_3 ext{)}_2 , is heated?
Class 10 · Science · Easy
→When a magnesium ribbon burns, the reaction is \(2Mg + O_2 \rightarrow 2MgO\). Which statement about this reaction is correct?
Class 10 · Science · Easy
→When calcium oxide is mixed with water, heat is released. Based on the heat change, what type of reaction is this?
Class 10 · Science · Easy
→When an iron nail is kept in a blue copper sulphate solution for some time, the solution fades and a reddish-brown coating forms on the nail. Which type of reaction does this represent?
Class 10 · Science · Easy
→Which gas is produced when calcium carbonate is heated?
Class 10 · Science · Easy
→What is the reaction called in which a compound breaks down into two or more simpler substances?
Class 10 · Science · Easy
→What is a reaction called in which two substances combine to form one product?
Class 10 · Science · Easy
→Why is balancing an equation by changing chemical formulae wrong?
Class 10 · Science · Easy
→Where are coefficients placed while balancing a chemical equation?
Class 10 · Science · Easy
→Why is a chemical equation more useful than a word equation?
Class 10 · Science · Easy
→What is the role of substances written on the right side of a chemical equation?
Class 10 · Science · Easy
→What is the role of substances written on the left side of a chemical equation?
Class 10 · Science · Easy
→In a balanced chemical equation, how does the number of atoms of each element compare in the reactants and products?
Class 10 · Science · Easy
→Why is it not correct to depend on only one sign while identifying a reaction?
Class 10 · Science · Easy
→A student places a clean iron nail in a blue copper sulphate solution for 20 minutes. Which observation correctly confirms that a displacement reaction has occurred?
Class 10 · Science · Easy
→Which of the following changes is an indication of a chemical reaction?
Class 10 · Science · Easy
→If the temperature of a reaction mixture rises without external heating, what type of reaction does this indicate?
Class 10 · Science · Easy
→If temperature decreases in a reaction what type can it be?
Class 10 · Science · Easy
→In a combustion reaction, energy is generally released in which form?
Class 10 · Science · Easy
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