Question

(a) Fill in the blanks:- [5]

(i) Solubility of gaseous solute ---------- with increase in temperature.

(ii) Isotopes have different mass no. due to difference in their no. of ---------.

(iii) Formula of Glauber’s salt is ------------.

(iv) Valency of iron in Fe2(SO4)3 is ----------.

(v) Metals are good ----------- agents.

(b) Name the following:- [5]

(i) The reaction in which the energy is liberated in the form of heat.

(ii) When a substance absorbs moisture and dissolve in it to form a saturated solution.

(iii) The bond formed by mutual sharing of electrons.

(iv) The fixed amount of water that is associated with some compounds.

(v) No. of times one atom of an element is heavier than 1/12 the mass of carbon 12.

(c) Define:- [5]

(i) Electrovalent bond

(ii) Efflorescence

(iii) Displacement reaction

(iv) Saturated solution

(v) Octet rule

(d) Differentiate between:- [5]

(i) Drying and dehydrating agent

(ii) Electropositive and electronegative elements

(iii) Polar and non polar covalent covalent bond

(iv) Isotopes and isobars

(v) Photochemical and electrochemical reactions.

(e) Give reasons:- [5]

(i) Electrovalent or ionic compounds are good conductor of electricity.

(ii) Slaked lime or baking soda applied over bee sting.

(iii) Chlorine 35 and chlorine 37 have same chemical properties.

(iv) Fused calcium chloride or concentrated sulphuric acid is used in desiccator.

(v) Noble gases exist as monoatomic molecules.

(f) Draw structures of the following:- [5]

(i) Orbital structure of CaO

(ii) Atomic structure of Cl-

(iii) Orbital structure of NH3

(iv) Atomic structure of O2-

(v) Orbital structure of H2O.​

Answer 1

a:(3)Na2So4.10H20 (5)reducing