Classify the following as eleemnt and compound.
(i) mercuric oxide
(ii) helium gas
(iii) water
(iv) table salt
(v) iodine
(vi) mercury
(vii) oxygen
(viii) nitrogen

Classify the following polynominals as linear and quadratic: (i) 5x+9 (ii) x^2+3x-5 (iii) 3x-7 (iv) 3x^2-5x (v) 5x^2

Classify the following as open, closed or isolated system. (i) Animals and plants on the earth. (ii) Calorimeter. (iii) Thermos flask filled with hot tea. (iv) A tin containing Pepsi.

Give chemical reactions when lanthanides reacts with (i) water(ii) oxygen (iii) Nitrogen (iv) halogens (v) carbon

Which are mixture and pure substances from the followings? (i) sea water (ii)gasoline (iii) skin (iv) a rusty nail (v) a page of the textbook. (vi) diamond

In which of the following molecules, the central atom has expanded octet ? (i) SCl_2 (ii) CO_2 (iii) PF_5 (iv) H_2SO_4 (v) BCl_3

Draw the structures of the following compounds the carbonyl C are same and classify them on the basis of C-O single bond and C = O double bond present in them: (i) Ethyl alcohol (ii) acetaldehyde (iii) o-nitrophenol (iv) Diethyl ether (v) isopropyl alcohol (vi) acetone.

Define the terms : (i) Uniform circular motion (ii)Radius vector (iii) period (iv) Angular speed (v) Centripetal acceleration (vi) Centripetal force.