Chemistry 126

Which of the following is metal

• Oxygen

• Iron

• Hydrogen

• Nitrogen

____is used as protecting shielding against X-rays and radiation from nuclear reactors

• Carbon

• Silicon

• Lead

• Germanium

• Tin

Which of the following periodic properties increases down the group of a periodic table.

• ionization energy

• Electronegativity

• none of the above

• Atomic Size

The largest source of sodium is

• Borax

• Beryl

• Rock Salt

• Saltpetre

• MgCO3

Which element in group 4A are non metals

• Carbon

• Carbon and Germanium

• ) Tin and Lead

• Silicon and Germanium

• Germanium and tin

Which of the following is not the uses of Potassium.

• Potassium compounds are used as fertilizer for plants.

• Potassium bromide is used in the photography industry

• Potassium chlorate is used for the extraction of aldehyde

• Potassium carbonate is used in ceramics, colour Tv tubes and fluorescent light tubes

6.One of these compounds is d²Sp³ hybridized

• PCI5

• SF7

• SEA

• SIC4

• SiH4

Which of the following is incorrect about lanthanides

• They are 4f block elements

• They are known as inner transition metals

• They are called rare elements

• They consist of 14 elements

• They are a period 3 elements

As we go from left to right across the period, ionization energy

• Decreases

• Increase

• Remains the same

• Undergoes slight changes

Hydraulic washing is used in the concentration of the following ores except

• Fe203

• ZnS

• Sn02

• AU

• None of the above.