Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.

(a)

both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds

(b)

In case of Sc, 3d orbital are partially filled but in Zn these are completely filled

(c)

last electron as assumed to be added to 4s level in case of zinc

(d)

both Sc and Zn do not exhibit variable oxidation states

Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.

(a)

Ti

(b)

Cu

(c)

Mn

(d)

Zn

The magnetic moment of Mn²⁺ ion is _______.

(a)

5.92BM

(b)

2.80BM

(c)

8.95BM

(d)

3.90BM

The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.

(a)

their magnetic behaviour

(b)

their unfilled d orbitals

(c)

their ability to adopt variable oxidation states

(d)

their chemical reactivity

The alloy of copper that contain Zinc is________.

(a)

Monel metal

(b)

Bronze

(c)

bell metal

(d)

brass

In acid medium, potassium permanganate oxidizes oxalic acid to _______.

(a)

oxalate

(b)

Carbon dioxide

(c)

acetate

(d)

acetic acid

Permanganate ion changes to ________ in acidic medium.

(a)

MnO₄²⁻

(b)

Mn²⁺

(c)

Mn³⁺

(d)

MnO₂

MnO₄^- react with Br^- in alkaline P^H to give ________.

(a)

BrO₃^- MnO₂

(b)

Br₂, MnO₄^2-

(c)

Br₂, MnO₂

(d)

BrO^-, MnO₄^2-

Which of the following oxidation states is most common among the lanthanoids?

(a)

+4

(b)

+2

(c)

+5

(d)

+3

The most common oxidation state of actinoids is _______.

(a)

+2

(b)

+3

(c)

+4

(d)

+6

The catalytic activity of transition metals is due to ________.

(a)

the formation of a variety of oxidation states

(b)

the formation of intermediate products

(c)

the capability of forming interstitial compounds.

(d)

all the above

Which of the following is wrong with respect to lanthanide contraction?

(a)

Decrease in ionic radii

(b)

Increase in tendency to act as reducing agents

(c)

Decrease in basic character

(d)

Resembles second and third row of d-block elements

The highest possible oxidation state shown by osmium in its compound is_______.

(a)

+4

(b)

+6

(c)

+8

(d)

+10

The trend in ionisation enthalpy of a transition element is not regular because,_______.

(a)

removal of one electron alters the relative energies of 4s and 3d orbitals

(b)

due to different electronic configuration (stability)

(c)

Poor screening of 3p-orbital

(d)

due to decrease in effective nuclear charge

Which of the following is coloured due to charge transfer?

(a)

MnO₄^-

(b)

CrO₄^2-

(c)

Cu₂O

(d)

All of these

What are the species X and Y in the following?

(a)

CrO₃, CrO₄^2-

(b)

CrO₃, Cr₂O₃

(c)

CrO₄^-2, Cr₂O₇^2-

(d)

H₂CrO₄, H₂Cr₂O₇

The correct statement is_______.

(a)

Cu₂Cl₂ and Ag₂S are coloured

(b)

Upon strong heating paramagnetic gases are evolved by NaNO₃ and AgNO₃

(c)

Green vitriol and blue vitriol are isomorphus

(d)

KMnO₄ and K₂Cr₂O₇ are coloured due to

On oxidation with KMnO₄ in acidic medium, SO₂ is oxidised to _______.

(a)

SO₂

(b)

H₂SO₄

(c)

SO₃^2-

(d)

H₂S

FeSO₄ on heating gives _______.

(a)

SO₂ and O₂

(b)

SO₂ and SO₃

(c)

SO₂

(d)

SO₃

_________ is known as Bayer's reagent.

(a)

Hot dilute alkaline KMnO₄

(b)

Cold dilute alkaline KMnO₄

(c)

Hot Conc. acidic KMnO₄

(d)

Cold Conc. acidic KMnO₄