Abundance of Elements

Q.

Interstitial hydride among the following is

1. YbH

2. LiH

3. CaH₂

4. H₂O

Q. Wolframite ore is separated from tin stone ore by the process of:

1. Roasting
2. Magnetic separation
3. Smelting
4. Calcination

Q.

A number of elements are available in earth’s crust but most abundant elements are ____________.

1. $Cu\text{and}Ag$
2. $Al\text{and}Cu$
3. $Al\text{and}Fe$
4. $Fe\text{and}Cu$

Q. The second most abundant metal present in the crust of the earth is :

1. $Ca$
2. $Al$
3. $Cu$
4. $Fe$

Q.

Which of the following transition metal has the highest melting point?

1. W
2. Mo
3. Cr
4. Hg

Q.

1. Haematite is an ore of:

1. (a) Aluminium

2. (b) Iron

3. (c) Copper

4. (d) Zinc

Q.

The following substances are put into the blast furnace when manufacturing iron: coke, ore, limestone, and hot air.

In these substances what is the name of the most common ore of iron and what is its chemical formula?

Q.

Cryolite is the chief ore of

1. Copper

2. Iron

3. Aluminium

4. Zinc

Q. Is there a sigma bond between metal and carbon in Ferrocene?

Q. The metal that is most abundant in the earth is ___________.

1. Silicon
2. Iron
3. Aluminium
4. Nikel

Q. Which of the following are uses of sulphur?

1. A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide
2. Sulphur is used in preparation of conducting wires
3. Sulphur is an element belonging to VI A group
4. Sulphur is a nonmetallic element.

Q. Which metals have sulfides ores?

Q. Why low spin complxes of nickel is not known?
Why transtiaonal metal form pi complexes?

Q. 34.What is the composition of seridite ore

Q. The two most abundant metals in the earth crust ?

1. A1, Zn
2. Ag , Au
3. Fe, A1
4. Fe , Cu

Q. Match the following metals with their ores

1. Lead
2. Iron
3. Aluminium
4. Mercury

Q. The major components of German Silver are:

1. $Cu,Zn$ and $Mg$
2. $Ge,Cu$ and $Ag$
3. $Zn,Ni$ and $Ag$
4. $Cu,Zn$ and $Ni$

Q. What is the ore of tin called?

1. Granite
2. Cassiterite
3. Bauxite
4. Magnetite

Q. Fill in the Blanks
_____ and ______ metal exists in allotropic forms.

Q. Black Jack is a sulphide ore.

1. True
2. False

Q.

Give the names of the most abundant and the next most abundant element in the earths crust.