which of the following take part in the formation of any molecule during chemical combination? - valence electron
Which is incorrect statements ? - Formation of positive ion involves addition of electron(s) while that of negative ion involves removal of electron(s).
What is the name of chemical bond formed by transfer of electron from one atom to another? - Electrovalent or ionic bond
what is name of chemical bond in compound formed by mutual sharing of valance electrons? - Covalent bond
The number electrons loosed by an atom to form Ionic bond is called---------. - Electrovalency
The condition essential for ionic bond is - Transfer of electrons
Which one is not a ionic compound? - NH4Cl
Why chlorine ion is more stable than chlorine atom ? - Chlorine ion have complete octoate.
Two elements (M) & (N) electronic configuration 2,8,2 and 2,8,7 forms a compound .What is the chemical formula of compound. - MN2
Which of following have low melting point? - H2S
Which condition is suitable for covalent bond - Both atom should have electro affinity.
In the formation of sodium chloride , ____loses the electron(s) to attain stable electronic configuration of ____. - Sodium, Neon
The number of electron(s) lost , gained or shared by atom of an element to form a chemical bond to attain stable electronic configuration is called ____. - Electron number
The electronic configuration of carbon is ____. - 2,4
Metals react with non-metals to form ionic compounds by ____. - loosing & gaining electrons
Which of the following only contains non-metals? - Both
Which of the following is not the property of non-metals? - They are sonorous
Which of the following metal will not give H2 (g) with H2O? - Cu
Which of the following pairs will give displacement reactions? - AgNO3 solution and copper metal
Which of the following methods is suitable for preventing an iron frying pan from rusting? - All of the above
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be - calcium
Food cans are coated with tin and not with zinc because - zinc is more reactive than tin
The most abundant metal in the earth’s crust is - Aluminium
The poorest conductor of heat among metals is - Lead
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin? - Sonorousness
Al2O3 + 2NaOH → …… + H2O - NaAlO2
Non-metals form covalent chlorides because - they can share electrons with chlorine
