Metallic radii of some transition elements are given below. Which of these elements will have highest density?
(a) Fe
(b) Ni
(c) Co
(d) Cu
(a) Fe
(b) Ni
(c) Co
(d) Cu
(d) Cu
Explanation: In periodic table when moving from left to right along period, its metallic radius decreases and mass increases. Decrease in metallic radius coupled with increase in atomic mass which results in the increase in density of metal. Therefore, among above four options, copper belongs to right side of periodic table in transition metal and it has the highest density.
Explanation: In periodic table when moving from left to right along period, its metallic radius decreases and mass increases. Decrease in metallic radius coupled with increase in atomic mass which results in the increase in density of metal. Therefore, among above four options, copper belongs to right side of periodic table in transition metal and it has the highest density.
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵. What is its atomic number?
(a) 25
(b) 26
(c) 27
(d) 24
What are the transition elements ? Write two characteristics of the transition elements.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
How would you account for the following ? Many of the transition elements are known to form interstitial compounds.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.
Assign the reason for the following :
Copper (I) ion is not known in aqueous solution.
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵. What is its atomic number?
(a) 25
(b) 26
(c) 27
(d) 24
Which one is not correct statement?
a) Nitrogen does not form pentahalide due to non-availability of the d orbitals in its valence shell
b) Pentahalides are more covalent than trihalides.
c) In case of nitrogen, only \(NF_3\) is known to be stable
d) Trihalides except \(BiF_3\) are predominantly ionic in nature
In the periodic table of the elements, the phrase “middle row anomaly” refers to
a) Middle elements of periodic table are transition metals.
b) Middle element of each group is unstable.
c) the relative instability of bromine oxides compared to the other halogen oxides.
d) The higher oxides of halogens tend to be more stable than the lower ones.
Metallic radii of some transition elements are given below. Which of these elements will have highest density?
Which of the following compounds will be most easily attacked by an electrophile?
Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) carboxylic acid