Question

Question 2 a)Complete and balance the following reaction [1*5=5]

i) Zn + HCl ----------> …….. + H2

ii) NaCl + AgNO3 ---------> AgCl + .,.....

iii) 2Na + Cl2 ----------->.......

iv) Mg + O2 ----------->......

v) Fe + S -------------->

b) Give one word for the following- [1*5=5]

i) Electrons present in the outermost shell of an atom.

ii) Atoms having same atomic number but different mass number.

iii) Bonds formed when atoms share their valence electron.

iv) Substance which are produced as a result of chemical reactions.

v) Short form to represent an element.

Question 3 a) Differentiate between- [3*2=6]

i) Cation and anion

ii) Electrovalent and covalent compound

iii) Compound and Mixture

c) Give reason for the following [1*4=4]

i) Silver nitrate is stored in dark bottles

ii) Atom as a whole is electrically neutral

iii) Silver jewellery exposed to air turns black

iv) Our hand feels cool when we put Acetone or nail polish remover on our palm.​

Answer 1

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