Inorganic Chemistry PYQ — Page 61

A reduction in atomic size with increase in atomic number is a characteristic of element of

One mole of the complex compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}_3$, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $\mathrm{AgNO}_3$ solution to yield two moles of $\mathrm{AgCl}$ (s). The structure of the complex is

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

In curing cement plasters water is sprinkled from time to time. This helps in

Which one of the following nitrates will leave behind a metal on strong heating?

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

In the coordination compound, $\mathrm{K}_4\left[\mathrm{Ni}(\mathrm{CN})_4\right]$, the oxidation state of nickel is

The number of d-electrons retained in $\mathrm{Fe}^{2+}$ (At.no.of $\mathrm{Fe}=26$ ) ion is

A red solid is insoluble in water. However it becomes soluble if some $\mathrm{KI}$ is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is

The radionucleide ${ }_{90}^{234} \mathrm{Th}$ undergoes two successive $\beta$-decays followed by one $\alpha$-decay. The atomic number and the mass number respectively of the resulting radionucleide are

Ammonia forms the complex ion $\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Which one of the following is an amphoteric oxide?

The radius of $\mathrm{La}^{3+}$ (Atomic number of $\mathrm{La}=57$ ) is $1.06 Å$. Which one of the following given values will be closest to the radius of $\mathrm{Lu}^{3+}$ (Atomic number of $\mathrm{Lu}=71$ )?

The pair of species having identical shapes for molecules of both species is

According to the Periodic Law of elements, the variation in properties of elements is related to their

Which one of the following compounds has the smallest bond angle in its molecule?

The atomic numbers of vanadium $(\mathrm{V})$, Chromium $(\mathrm{Cr})$, manganese $(\mathrm{Mn})$ and iron $(\mathrm{Fe})$ are respectively 23 , 24,25 and 26 . Which one of these may be expected to have the highest second ionization enthalpy?

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be

Which one of the following pairs of molecules will have permanent dipole moments for both members?

The most stable ion is

Which is the correct order of ionic sizes ? (Atomic Number : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)

Which of the following are arranged in an increasing order of their bond strengths ?

Which of the following statements is true ?

In $\mathrm{XeF}_2, \mathrm{XeF}_4, \mathrm{XeF}_6$ the numebr of lone pairs of $\mathrm{Xe}$ are respectively