Determine the valencies of H, Cl, O and Na from the molecular formulae `H_2`, HCl, `H_2 O` and NaCl.

Use the following molecular formula to determine the valencies of H, Cl, O, S, N, C, Br, I, Na Molecular formulae- H_2, HCl, H_2O,H_2S, NH_3, CH_4, HBr, HI, NaH .

Write the names and symbols of the constituent elements and identify their valencies from their molecular formula given below: KCl, HBr, MgBr_2, K_2O, NaH, CaCl_2, CCl_4, HI, H_2S, Na_2S, FeS, BaCl_2

Rewrite the sentence after filling the blank: The valency of hydrogen is 'one' as per the molecular formula H_2O . Therefore valency of Fe turns out to be-----as per the formula Fe_2O_3 .

Ethane with molecular formula C_2H_6 has……. Covalent bonds.

The valencies of the atom H,O and N are 1, 2 and 3 respectively . The molecular formulae of these gaseous elements are H_2 , O_2 and N_2 respectively. How many chemical bonds are there in each of these molecules ?

An organic compound P has molecular formula C_(2)H_(4) . On reduction, it gives another compound Q with molecular formula C_(2)H_(6). Q reacts with chlorine in the presence of sunlight to give R having molecular formula C_(2)H_(5)Cl. Identify P, Q and R.

Write structure of optically active alcohol having molecular formula C_4H_10O

Solve the examples Following are atomic masses of a few elements in Daltons and the molecular formulae of some compounds. Deduce the molecular masses of those compounds. Molecular formulae: H_2 O_2 (Atomic masses: H=1, O=16, N=14, C=12, Na=23, Cl=35.5, K=39, Mg=24, Al=27, Ca=40, P=31, S=32)

Following are atomic masses of a few elements in Dalton and the molecular formulae of some compounds. Deduce the molecular masses of those compounds. Atomic masses H(1), (16), N(14), C(12), K(39), S(32) Ca(40), Na(23), CI(35.5), Mg(24). Al(27) Molecular formulae → NaCI, KNO,H2O, AICI3, Ca(OH), MgO, H2SO4, NaOH​Mg(24). Al(27) Molecular formulae → NaCI, MOCI,, KNO,H,O, AICI, Ca(OH),, MgO, H,SO, HINO, NaOH​