List of top Questions asked in TBSE Class X Board

Write the S.I. unit of: (i) Electric potential difference (ii) Resistance
Why does a clear sky appear blue?
Why is sodium metal kept immersed in kerosene?
What is an indicator? Write the names of two indicators.
Why should curd and sour substances not be kept in brass and bronze vessels?
What is meant by hydrogenation or addition of hydrogen? What is its application in industry?
What is the name of the hardest allotrope of carbon?
What is vinegar?
Draw two structural isomers having the formula \(\text{C}_4\text{H}_{10}\).
Which is more useful between soap and detergent, and why?
The radius of curvature of a spherical mirror is \(20\text{ cm}\). What is its focal length?
Which gases are produced at the cathode and anode during the electrolysis of acidulated water?
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.
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.
What is an amalgam?
Write the name of a carbon-less functional group.
Which gas is usually evolved when an acid reacts with a metal? How will you test the presence of this gas?
Write the IUPAC name of \(\text{CH}_3-\text{C}\equiv\text{CH}\).
Write the structural formula of ethanoic acid.
Why are packets of oily or fatty foods flushed with nitrogen gas?
In the following reaction, which substance is oxidized and which is reduced?
\(4\text{Na} + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}\)
What happens when an iron nail is dipped in copper sulfate solution? Write with equation.