Which of the following groups contains no ionic compounds? HCN, . NO_2, Ca(NO_3)

Question

Which of the following groups contains no ionic compounds? HCN, . NO_2, Ca(NO_3)_2 PCl_5, LiBr, Zn(OH)_2, KOH, CCl_4, SF_4 NaH, CaF_2, NaNH_2 CH_2 O, H_2 S, NH_3 Atoms having equal or nearly equal electronegativities are expected to form no bonds polar covalent bonds nonpolar covalent bonds ionic bonds covalent bonds Using the following bond energies: estimate the heat of combustion for one mole of acetylene: C_2 H_2(g) + 1/2 O_2(g) rightarrow 2 CO_2(g) + H_2 O(g) 1228 kJ -1228 kJ -447 kJ +447 kJ +365 kJ What is the correct molecular structure for H_2 O linear trigonal planar tetrahedral bent none of these

Explanation / Answer

Answers;

16. CH2O, H2S, NH3 groups contains no ionic compounds.

17. Atoms having equal or nearly equal electronegativities are expected to form non polar covalent bonds.

19. The answer is option (d) Bent. The H-O-H bond angle in a molecule of water is 104.5o

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