Download App

Chemical Changes and Reactions — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYChemical Changes and Reactions2 Marks
Question
Define Photochemical reaction
Give an example
✓

Answer

It is a reaction which occurs with absorption of light energy.
$
6 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{O}_2
$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Chemical Changes and Reactions→Chemical Changes and Reactions — all question types→CHEMISTRY STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

What information do the following chemical equations convey? $Mg+2HCl \rightarrow MgCl_2+H_2$​​​​​​​
→
How are the elements having variable valency named?
→
Gases exert same pressure in all direction.
→
By giving examples explain the following terms:
(a) Oxidation reaction
(b) Reduction reaction
→
Explain the following:
Mass of an atom is concentrated inside the nucleus of the atom.
→
Write the electronic configuration of the following elements:
${ }^{31} \mathrm{P}_{15}$
→
Why do all elements have fractional atomic mass?
→
Explain, giving one example for each of the following chemical changes:
Displacement
→
Draw the atomic structure of the following elements geometrically, clearly showing the (a) number of protons (b) number of neutrons and (c) number of electrons in various shells around nucleus :

(a) ${ }^2 \mathrm{H}_1$
(b) ${ }^7 \mathrm{Li}_3$
(c) ${ }^{27} \mathrm{Al}_{13}$
(d) ${ }^{40} \mathrm{Ca}_{20}$
→
Comment on the (i) reactivity (ii)colour(iii) physical state of group 17 elements.
→