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Class 10 · Science · Easy
→The balanced chemical equation for the formation of water from hydrogen and oxygen is \,\(2H_2 + O_2 \rightarrow 2H_2O\). What coefficient is placed before water?
Class 10 · Science · Easy
→The formation of an insoluble solid on mixing two solutions is commonly an indication of what?
Class 10 · Science · Easy
→What is the best way to identify that a chemical reaction has occurred?
Class 10 · Science · Easy
→What type of change occurs when milk is converted into curd?
Class 10 · Science · Easy
→Why is digestion of food a chemical change?
Class 10 · Science · Easy
→An iron nail is placed in a blue copper sulphate solution for some time. Which observation is correct?
Class 10 · Science · Easy
→A student writes \(H_2O_2\) instead of \(H_2O\) while balancing the equation \(H_2 + O_2 \rightarrow H_2O\). What is the correct way to correct this error?
Class 10 · Science · Easy
→Which state symbol is used to represent an aqueous solution in a chemical equation?
Class 10 · Science · Easy
→Which symbol denotes the liquid state of a substance in a chemical equation?
Class 10 · Science · Easy
→Which state symbol represents the gaseous state of a substance in a chemical equation?
Class 10 · Science · Easy
→During a chemical reaction, the evolution of a gas is often identified by which observation?
Class 10 · Science · Easy
→What does colour change during a chemical reaction indicate?
Class 10 · Science · Easy
→What is the characteristic feature of the product formed in a precipitation reaction?
Class 10 · Science · Easy
→Why are antioxidants added to food materials?
Class 10 · Science · Easy
→Which gas is filled in packets of chips to reduce rancidity?
Class 10 · Science · Easy
→What is the process in which oils and fats develop an unpleasant taste and smell due to oxidation called?
Class 10 · Science · Easy
→In galvanisation, which metal is coated on iron or steel?
Class 10 · Science · Easy
→What substance is formed on iron during rusting?
Class 10 · Science · Easy
→Which two substances must be present for iron to rust?
Class 10 · Science · Easy
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