Answer:
Enzymes are required to slow down biological reactions within cells,
this could be not sure
0.2 is the correct answer and shown above is the shown work
<span>Answer: option 3) magnesioum reacts with an acid.
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<span>Justification:
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<span>1) Malleability, conduction of electricity, and boiling point are physical properties.
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<span>2) Maleability is the ability to be transformed into foil. It is just a change in form. So, it is a physical property.
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<span>3) The metals conduct electricity in virtue of the array of the atoms, which permtis the flow of the electrons, but it does not involve a chemical change, so it remains being a physical proerty.
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<span>4) Boling point is the temperature at which a substance passes from liquid state to gas state, which are just different forms of the same substance. So, it is other physical property.
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<span>5) Reaction with an acid is indeed a chemical transformation: the metal (magnessium) will form a chemical bond with some spieces of the acid to form a new compound. This is a chemical reaction in virtue of the chemcial properties of the substance (its ability to react with acids)</span>
a)Green color appears.
Burning splint test tells us us that it is hydrogen gas.
b)
c)There would be an effervescence. Upon passing the gas through lime water it turns milky $\implies$ gas is Carbon Dioxide.
d)$\NiCO_3+ H_2SO_4 \longrightarrow NiSO_4 + CO_2 +H_2O$