Question

 A student listed some items as shown.  

Which substances cannot be broken into simpler substances?  

(a) methane and silicon  

(b) silicon and hydrogen  

(c) acetic acid and hydrogen  

(d) methane and acetic acid​

Answer 1

b) silicon and hydrogen , is the correct option

because silicon and hydrogen are elements where as methane & acetic acid are made up of two or more elements .

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Answer 2

Substances such as (b) silicon and hydrogen cannot be broken into simpler substances.

Explanation:

General concept:

• Substances which are considered as compound can be broken into simpler substances.
• This is because, when same or different elements combines together through bond formation, it yields compound.

Correct option (b) silicon and hydrogen:

• Silicon and hydrogen are considered as an elements.
• The symbol of silicon and hydrogen is 'Si' and 'H' respectively.
• They cannot be broken into simpler substance as they are not compounds.

Incorrect option (a) methane and silicon:

• Methane is a compound whereas silicon is an element.
• Methane can be broken into simple substances whereas silicon cannot.

Incorrect option (c) acetic acid and hydrogen:

• Acetic acid is a compound whereas hydrogen is an element.
• Acetic acid can be broken into simple substances whereas hydrogen cannot.

Incorrect option (d) methane and acetic acid​:

• Methane as well as acetic acid are compound.
• Thus they both can be broken into simpler substance.

Final answer:

(b) silicon and hydrogen cannot be broken into simpler substances as they are elements.