Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains H+ ions less than OH– ions on this paper. She observed that the colour of paper turned yellow. What do you think was solution X?
A Red litmus solution
C Methyl orange
D Turmeric solution
PL EXPLAIN WHAT IS H ions AND OH-ions IN THIS QUESTION
Aradhya dips a can into a container of soapy water as shown here. A thin film of soapy water was formed over its mouth.
Aradhya holds the can tightly in her hands for a while. What do you think will happen?
ANothing will happen.
BA bubble will form out of the mouth of the can.
CThe film will sink into the can.
DThe film will pop.
Which of the following is the best method of purification of muddy water?
D None of these
How can be mud filtered using filter paper? Please give explanation.
Megha made a drawing using only curved lines. Which cannot be her drawing ?
why not option d
Shown below are four setups A, B, C and D, each with same wooden block having rubber band of same material tied on it. Which setup will produce the loudest sound on pulling the rubber band and striking it back on the block?
Please explain the reason.