I believe the correct answer from the choices listed above is the third option. The ion would be Al+3. It is obvious because among the options, this is the only substance that has a charge. <span>An </span>ion<span> is an atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge. </span>
Secondary air pollutants are the ones that are formed as a result of reactions
between primary pollutants and other elements in the atmosphere, such as ozone
Answer:
1) some of the gas maybe metal but non metal directly refers it self to not begin metal
2) gases are present in only air . non metals are available in solid form too
In this question we are asked to round off the figure 0.02056 to three significant figures.
We are given with four options to chose best out of four
a) 0.0205
b) 0.0206
c) 0.021
d) 0.020
In this question, option (b) is correct i.e. 0.0206.
There are four significant rules, we should keep in mind during round off:
- Non-zero digits are so significant
- Zeros between two non-zero digits are significant
- Leading zeros are not significant
- Trailing zeros are important only if the number contains a decimal point
To know more about Round off:
brainly.com/question/24234983
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I think it means the reaction doesn't have any intermediate phases - the order doesn't change, and it moves at the same rate, it doesn't speed up or slow down at any time
