List of top Chemistry Questions asked in TBSE Class X Board

Why is sodium metal kept immersed in kerosene?
Why should curd and sour substances not be kept in brass and bronze vessels?
What is an indicator? Write the names of two indicators.
Draw two structural isomers having the formula \(\text{C}_4\text{H}_{10}\).
What is vinegar?
What is the name of the hardest allotrope of carbon?
What is meant by hydrogenation or addition of hydrogen? What is its application in industry?
Which is more useful between soap and detergent, and why?
What type of oxide is formed when a non-metal combines with oxygen?
Write two differences between metals and non-metals based on chemical properties.
Give an example of an antacid.
What is the common name of the compound \(\text{CaOCl}_2\)?
Write two important uses each of washing soda and baking soda.
Which gases are produced at the cathode and anode during the electrolysis of acidulated water?
What is an amalgam?
In the following reaction, which substance is oxidized and which is reduced?
\(4\text{Na} + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}\)
Which gas is usually evolved when an acid reacts with a metal? How will you test the presence of this gas?
What happens when an iron nail is dipped in copper sulfate solution? Write with equation.
Write the name of a carbon-less functional group.
Write the IUPAC name of \(\text{CH}_3-\text{C}\equiv\text{CH}\).
Why are packets of oily or fatty foods flushed with nitrogen gas?
Write the structural formula of ethanoic acid.
Balance the chemical equation: \(\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2\)
Which of the following is not a chemical change?
Which of the following metals remains in liquid state at room temperature?