A given solid can belong to one of the four crystal types, i.e., ionic, molecular, covalent and metallic. Indicate the crystal type of the following :
(a) Diamond
(b) Sodium chloride
(c ) Ice
(d) Copper
(e ) Boron nitride
(f) Zinc oxide
(g) Paraffin wax

The valency of sodium is one. Write the molecular formula for the following compounds of sodium (a) sodium oxide (b) sodium sulphate (c) sodium carbonate (d) sodium hydroxide (e) sodium nitrate

In the given figure . Which of the following are non collinear points ? L and E (b) F.L and G ( c ) I. E and H (d) F.L and E

Which of the following are not compounds? (a) Chlorine gas (b) Potassium chloride (c) Iron (d) Iron sulphide (e) Aluminium (f) Iodine (g) Carbon (h) Carbon monoxide (i) Sulphur powder

Which of the following materials fall in the category of a pure substance ? (a) Ice (b) Milk (c ) Iron (d) Hydrochloric acid (e ) Calcium oxide (f) Mercury (g) Brick (h) Wood (i) Air.

Give one example for each of the following types (a) Migratory animal (b) Camouflaged animal (c) Predator animal (d) Biological control agent (e) Phytophagous animal (f) Chemical defense agent

Give the characteristic coordination number of each of the following central metal ions . (a) Cu(I) (b)Cu(II) (c ) CO(III) (d) AI(III) (e) Zn(II) (f) Fe(II) (g) Fe(III) (h) Ag(I) .

Arrange the following types of interaction in order of decreasing stability (a) Covalent bond (b) van ber Waals force (c ) H-bonding (d) Dipole interaction (e) Ionic bond .

Write the molecular formulae for the following compounds. a) Copper (II) bromide b) Aluminium (III) nitrate c) Calcium (II) phosphate d) Iron (III) sulphide e) Mercury (II) chloride. f) Magnesium (II) Acetate.

Write formulas for the following compounds: a. Mercury (II) chloride b. Nickel (II) sulphate c. Tin (IV) oxide d. Thallium (I) sulphate e. Iron (III) sulphate f. Chromium (III) oxide

Select from the given below (A to F), the one substance in each case which matches the descriptions given in parts (i) to (vi). Copy and complete the given grid with your answers as shown for part (i). (A) Ammonia (B) Copper oxide (C) Copper sulphate (D) Hydrogen chloride (E) Hydrogen sulphide (F) Lead bromide (i) Although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature. (ii) A solution of this compound is used as the electrolyte when copper is purified. (iii) When this compound is electrolysed in the molten state, lead is obtained at the cathode. (iv) This compound can be oxidized to chlorine. (v) This compound smells of rotten eggs. (vi) This compound can be reduced to copper when heated with coke.