Question

*रैखिक समीकरण युग्म को ग्राफीय विधि से हल करने पर यदि प्राप्त रेखाएँ सम्पाती हो, तो हल होंगे:*

1️⃣ एक हल
2️⃣ अनंत हल
3️⃣ कोई हल नहीं​

Answer 1

Solution :-

Physical Change :-

(1) When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. (2) Physical change is a temporary change.

(3) A Physical change affects only physical properties i.e. shape, size, etc.

(4) In a physical change, no new substance is formed.

(5) Physical change is easily reversible i.e original substance can be recovered.

Example :- Freezing of water, melting of wax, boiling of water, etc.

Chemical Change :-

(1) When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.

(2) A chemical change is a permanent change.

(3) Chemical change both physical and chemical properties of the substance including its composition.

(4) A chemical change is always accompanied by one or more new substance(s).

(5) Chemical changes are irreversible i.e. original substance cannot be recovered.

Example :- digestion of food, burning of coal, rusting, etc.

Answer 2

Step-by-step explanation:

3 wala is the right ans hhshshahah