chimabobo

Which of the following is an oxide ore?

1) Malachite     2) Haematite     3) Copper glance    4) Zinc blende  

The equation x + 2y + 2z = 1 and 2x + 4y + 4z = 9 have

1) Only one solution

2) Only two solutions

3) Infinite number of solutions

4) None of these.  

The coefficient of χ3 in the infinite series expansion of 2/(1– χ) (2 – χ), for |χ| < 1 is

1) – (1/16)

2) 15/8

3) – (1/8)

4) 15/16  

Wurtz reaction involves the reduction of alkyl halide with

1) Zn/HCl 

2) HI

3) Zn/Cu couple

4) Na in ether