Question

If you burn anything for example-cardboard, paper, plastic it becomes black but the sun is burning all the time so, why is it yellowish-golden?

Answer 1

Hint: We have to know that, an exothermic response is characterized as a response that delivers heat and has a net negative standard enthalpy change. Models incorporate any ignition interaction, rusting of iron, and freezing of water. Exothermic responses are responses that discharge energy into the climate as warmth.

Complete answer:
We have to know that consuming paper is really a substance response, which includes exothermic response. The warmth is delivered. Paper is singed oxygen from the air containing carbon and hydrogen. In the wake of consuming it goes to strong remains and smokes. Sun doesn't consume as much as paper or cardboard do. The sun shines in light of the cycle called atomic combination. At the point when one proton crushes into another proton and delivers some energy. With the goal that it's anything but a yellowish shading.
Warm paper is an exceptional fine paper that is covered with a material planned to change shading when presented to warm. It is utilized in warm printers, especially in reasonable or lightweight gadgets, for example, calculators, sales registers, and Master-card terminals.
The outside of the paper is covered with a strong state combination of color and a reasonable lattice; a mix of a fluoran leuco color for instance. At the point when the lattice is warmed over its dissolving point, the color responds with the corrosive movements to its shaded structure, and the changed structure is then preserved in a metastable state when the grid sets back rapidly enough. Generally, the covering will become dark when warmed, yet coatings that become blue or red are now, and again utilized. While an open warmth source, like a fire, can stain the paper, a fingernail swiped rapidly across the paper will likewise create sufficient warmth from rubbing to deliver an imprint.

Note:
 We have to know that consuming a piece of paper is actually called ignition. It's anything but a synthetic response whereby the carbon compounds in the paper are oxidized into various synthetic substances like carbon dioxide and water fumes. This is a compound change.