11.

Which of the following is not a characteristic of transition elements?

• Variable oxidation states

• Formation of coloured compounds

• Formation of interstitial compounds

• Natural radioactivity

$\mathrm{Cl}-\mathrm{P}-\mathrm{Cl}$ bond angles in PCl₅ molecule are

• 120° and 90°

• 60° and 90°

• 60° and 120°

• 120° and 30°

The magnetic moment of a salt containing Zn²⁺ ion is

• 0

• 1.87

• 5.92

• 2

The IUPAC name of the given compound [Co(NH₃)₅Cl]Cl₂ is

• penta amino cobalt chloride chlorate

• cobalt penta ammine chloro chloride

• pentamine chloro cobalt (III) chloride

• penta amino cobalt (III) chlorate

When SCN^- is added to an aqueous solution containing Fe(NO₃)₃, the complex ion produced is

• [Fe(OH₂)₂(SCN)]²⁺

• [Fe(OH₂)₅(SCN)]²⁺

• [Fe(OH₂)₈(SCN)]²⁺

• [Fe(OH₂)(SCN)]⁶⁺

Hair dyes contain

• copper nitrate

• gold chloride

• silver nitrate

• copper sulphate

Schottky defects occurs mainly in electrovalent compounds where

• positive ions and negative ions are of different size

• positive ions and negative ions are of same size

• positive ions are small and negative ions are big

• positive ions are big and negative ions are small

The number of unpaired electrons calculated in [Co(NH₃)₆]³⁺ and [CoF₆]^3- are

• 4 and 4

• 0 and 2

• 2 and 4

• 0 and 4

If a plot of log₁₀ C versus t gives a straight line for a given reaction, then the reaction is

• zero order

• first order

• second order

• third order

The half-life period of a first order reaction is 1 min 40 s. Calculate its rate constant.

• 6.93 $\times {10}^{-3} {\min }^{-1}$

• 6.93 $\times {10}^{-3} {\mathrm{s}}^{-1}$

• 6.93 $\times {10}^{-3} \mathrm{s}$

• $6.93 \times {10}^3 \mathrm{s}$