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पनीह
छालन से क्या अभिप्राय है? यह कहाँ उपयोग होता है?​

I don't know I don't know

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds