KPK 9th Class Chemistry Chapter 8 Chemical Reactivity Short Questions Answers
| Class: | 9th Class | Subject: | Chemistry |
| Chapter: | Chapter 8 | Board: | KPK Boards |
KPK 9th Class Chemistry Chapter 8 Chemical Reactivity Short Questions with answers are combined for all 9th class(Matric/ssc) Level students.Here You can prepare all Chemistry Chapter 8 Chemical Reactivity short question in unique way and also attempt quiz related to this chapter.Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.
Class/Subject: 9th Class Chemistry
Chapter Name: Chemical Reactivity
Board: All KPKÂ Boards
- Malakand Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Mardan Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Peshawar Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Swat Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Dera Ismail Khan Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Kohat Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Abbottabad  Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
- Bannu Board 9th Class Chemistry Chapter 8 Chemical Reactivity short questions Answer
Helpful For:
- All KPK Boards 9th Class Chemistry Annual Examination
- Schools 9th Class Chemistry December Test
- KPK 9th Class Chemistry Test
- Entry Test questions related Chemistry
KPK 9th Class Chemistry Chapter 8 Chemical Reactivity Short Questions Answers
  4Li+ 2O2→ 2Li2OIdentify at least two group that contain only metallic atoms.
The two group of periodic table which just possess metal sare 1st group as;
IA Group (Alkali Metals)
IIA Group (Alkaline Earth Metals)
Li
Be
Na
Mg
K
Ca
Rb
Sr
Cs
Ba
Fr
Ra
</span>Write down reactions of IA elements with oxygen with balance equation.
Behaviour with oxygen:
  4Na+2O2→ 2Na2O
 4K+ 2O2→ 2K2O
State the physical properties of metals.
The metals are generally consisted of the properties of:
How does sodium acts as reducing agent. Write its reaction also.
Na is one of the electro positivity elements. It loses its valence electron easily and reduces another one.
Example: In NaCl, sodium atom (Na) going to lose electron and get oxidation, while Cl2 gains electron and get reduction as;Â
2Na + Cl2→2NaCl
I.E of alkaline earth metals is higher than alkali metals why?
Nuclear charge, atomic size, and valence electronic configuration are the factors which affect I.E.
Alkaline earth metals have smaller size and high nuclear charge, thus their valence electrons are tightly bonded to nucleus, thus need more and more energy to remove the valence electrons, that is why, I.E of alkaline earth metals is higher than alkali metals.
 Na→Na++ e               I.E=496Kj/mole.Â
Mg →Mg+++ e              I.E=737.7 Kj/mole
</span>Pure gold is not used for ornaments, why?
Pure gold is a noble metal. It is too much soft resist the stresses. Thus alloying gold with other metals like copper, silver, platinum (which increases it durability) is used for ornaments and jewelry.What are the of magnesium?
Mg is used in:
Write down reaction of Cl<sub>2</sub> with NaOH with balance equations.
The expected reaction of Cl2 with NaOH is given below.
 NaOH +Cl2 →NaOCl+HClHow does ionization energies values very group?
Groupwise (top to bottom) I.E of elements decreases. This decrease is due to increase in atomic size and shielding effect.
Element
I.E (KJ/mol)
Trend
Li
520
Decreases
Na
469
K
419
Rb
403
What happens during displacement reaction in halogens?
Generally the upper halogen, replaces lower halogen during displacement reaction as:
  2NaBr+Cl2→2NaCl+Br2
 2NaCl+F2→2NaF+ 2Cl2
How to Write Perfect Short Answers?
In Board Exams, the examiner looks for specific keywords and presentation. Here is how to attempt Chapter 8 questions:
- Ideal Length: Write 3 to 5 lines for each short question. Too short gets fewer marks, too long wastes time.
- Highlighting: Use a Blue Marker to highlight key dates, names, or scientific terms in your answer.
- Units & Formulas: Always write the formula and SI unit. Without units, 0.5 marks are deducted.
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