The s-Block Ele...

Lithium borohydride, $$LiB{H}_{4}$$, crystallizes in an orthorhombic system with four molecules per unit cell. The unit cell dimensions are $$a=6.0\mathring { A } ,b=4.4\mathring { A } ,c=7.5\mathring { A } $$. The density of crystals is
$$\left( Li=7,B=11,{ N }_{ A }=6\times { 10 }^{ 23 } \right) $$

Which two processes are involved in the preparation of magnesium sulfate from dilute sulfuric
acid and an excess of magnesium oxide?

The magnitude of property X of five elements from the third period of the Periodic Table, $$P,Q,R,S$$ and $$T$$ is shown $$P,Q,R,S$$ and $$T$$ have cosecutive atomic numbers. The letters do not represent the symbols of the elements.
Which row correctly identifies property X and element R?

When dealing with a spillage of metallic sodium it is important that no toxic or flammable products are formed.
Which material should be used if there is a spillage of metallic sodium?

The products obtained on heating $$LiNO_3$$ will be:

$$KO_2$$ (Potassium superoxide) is used in oxygen cylinders in space and submarine because it: 

Be and Al exhibit many properties which are similar. But the two elements differ in:

In which property listed below hydrogen does not resemble alkali metals?

As compared to alkali metals, alkaline earth metals;

Alkali metals are characterised by: