Which ga makes a pop sound if exposed to lighted matchstick?

How would you demonstrate that green plants release oxygen when exposed to light ?

Chloroform on exposed to light and air, oxidise to produce

A light yellow coloured compound 'X' is exposed to sunlight for sometime. It is turned into gray coloured material. What is the name of 'X' ? Predict the type of chemical reaction occurred in it.

Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of

A cobalt plate is placed at a distance of 1 m from a point source of power 1 W Assume a circular area of the plate of radius r =1A°. A is exposed to the radiation and ejects photoelectrons. The light energy is considered to be spread uniformly and the work function of cobalt is 5 eV. The minimum time the target should be exposed to the light source to eject a photoelectron (assuming no reflection losses) is

When do you notice a pop sound is a chemical reaction?

a line of shapes is constructed using matchsticks. i) find the rule that shows how many sticks are needed to make a group of such shapes? ii) how many matchsticks are needed to form a group of 12 shapes?