PERIODIC CLASSIFICATION OF ELEMENTS

How many groups in periodic table?
1. 16
2. 9
3. 18
4. none of tehse
Th e distance between the two hydrogen nuclei of the molecule is
1. 0.74 Å
2. 1.74 A
3. 7.4A
4. 0.47A
In the following less reactive metal is?
1. Zn
2. Na
3. Ag
4. none of these
In the following What is physical property of metal?
1. Physical state
2. Lustre
3. Density
4. All of the above
chemical property of metal is?
1. Atomicity
2. Hardness
3. Solubility
4. None of these
chief ore of aluminium is?
1. Cryolite
2. Bauxite
3. Corundum
4. None of thesse
how many types in alloys?
1. 2
2. 3
3. 4
4. 5
The charge used in the metallurgy of iron consists of roasted ore, coke and limestone in the ratio of
1. 1:8:4
2. 8:4:1
3. 4:8:1
4. none of these
What is an important metal to form amalgam.
1. Ag
2. Hg
3. Mg
4. Al
The process of coating zinc on iron sheets by using electric current is called
1. Painting
2. Galvanization
3. Thinning
4. none of these