Question

Which is not true about $Cr$ ?
A) 4th period VI group
B) It is 4d series element
C) Max. Oxidation state $+ 6$
D) None of these

Answer 1

We have to know that chromium is a transition metal belong to d block element having an atomic symbol $24$ and electronic configuration can be represented as $\left[ {Ar} \right]3{d^5}4{s^2}$. It has an atomic weight of approximately $52$ u. It comes under the category of metals. Be careful while answering this question because it is asking for the incorrect statement.

Complete answer:
We will look at all the options first to answer this question.
Option A) this is an incorrect option as this statement which says that Chromium belongs to 4th period and VI group is correct.
Option B) This is a correct option as we have to identify the wrong statement and this statement says that chromium belongs to the 4d series element which is incorrect because chromium belongs to the 3d series transition element.
Option C) this is an incorrect option as this statement is true as chromium has oxidation states which are $+ 2$, $+ 4$ and $+ 6$ the maximum oxidation state is $+ 6$ . So this statement is true but the option is incorrect.
Option D) this is an incorrect option

As we got Option B) as the correct answer for this question.

Note:
We have to know that chromium metal is used in many things; it is a hard, silvery metal with a blue tinge. It is used to harden steel, to manufacture stainless steel and to produce several alloys. Chromium plating can be used to give a polished mirror finish to steel. This metal is also dangerous to human health and considered to be toxic in nature.