A. Choose the correct option for the following:
10M
1) The atomic size:-
a) Decreases b) Increases c) Remains the same d) Sometimes increases and sometimes
decreases
2) The non metallic character of the elements:-
a) Decreases b) Increases c) Remains the same d) Depends on the period.
3) The molecule which contains a triple covalent bond is
a) Ammonia b) Methane c) Water d) Nitrogen.
4) The one which is composed of the three kinds of bonds(Ionic, covalent and co-ordinate bond)
a) Sodium chloride b) Ammonium chloride c) Ammonia d) Carbon tetra chloride.
5) A metal which produces hydrogen on reacting with alkali as well as with acid.
a) Iron b) Magnesium c) Zinc d) copper
6) State which is not a typical property of an ionic compound.
a) High MP b) Conducts electricity in molten and the aqueous state
c) Are in soluble in water. d) Exist as oppositely changed ions even in the solid state.
7) Among the elements given below. The element with the least electro negatively is.
a) Lithium b) Carbon c) Boron d) Fluorine
8) Metals lose elements during ionisation. This change is called
a) Oxidation b) Reduction c) Redox d) Displacement
9) The colour of copper sulphate is
b) Green ) Zinc
d) Copper
10) A metal which produces hydropen on reacting with alkali as well as with acid
b) Magnesium c) Zinc d) Copper
the following as per instructions given in brackets:-
a) Blue
a) Iron
Answers
Explanation:
ANSWER
Reactivity refers to how likely or vigorously an atom is to react with other substances. This is usually determined by how easily electrons can be removed (ionization energy) and how badly they want to take other atom's electrons (electronegativity) because it is the transfer/interaction of electrons that is the basis of chemical reactions.
Reactivity of metals decreases as you go from left to right across a period. Reactivity of metals increases as you go down a group.
The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity.
Reactivity of non-metals increases as you go from the left to the right across a period. Reactivity of non-metals decreases as you go down the group.
The farther right and up you go on the periodic table, the higher the electronegativity, resulting in a more vigorous exchange of electron.