Question

25. What is the molecular shape of CIF: as predicted by the VSEPR theory? A) linear B) bent C) see-saw D) T-shaped E) L-shaped 26. A system delivers 1275 J of heat while the surroundings perform 855 J of work on it. Calculate AE in J. A) -2130 J B) -420 J C) 420 J D) 2130 J E) -1275 J 27. How many milliliters of 1.58 MHCI are needed to react NaHCO (M-84.02 g/mol)? HCl(aq)+ NaHCO (s) A) 638 mL B) 572 mL C) 536 mL completely with 23.2 g of + CO:g) H2OD NaCls) + D) 276 mL E) 175 mL 28. What is the molecular shape of NO as predicted by the VSEPR theory? A) linear B) trigonal planar C) bent D) tetrahedral E) resonant 29. Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. COSO (ag) A) cobalt(II) phosphate, Cos(PO4)2 B) cobalt(I) phosphate, Cos(POa)2 C) cobalt(II) phosphate, COPO D) cobalt(III) phosphate, COPO E) ammonium sulfate, (NH)2S0 (NH)sPO4(aq)

Answer 1

25. ClF₂^-

The central atom is Cl which has 5 electron pairs out of which two are bond pairs and three are lone pairs. So, molecular shape is Linear

26.Q = delE + W

- 1275 J = delE - 855 J

So, delE = - 420 J

Answer is (B)

27. Moles of NaHCO₃ = Mass / Molar mass = 23.2 g / ( 84.02 g / mole) = 0.276 mole

Moles of HCl required to neutralize NaHCO3 = 0.276 mole

Volume of HCl solution required = Moles / Molarity = 0.276 moles/ (1.58 M) = 0.175 L = 175 mL

28. (C) Bent

29. 3 CoSO₄ ( aq) + 2 (NH₄)₃PO₄ (aq) = Co₃(PO₄)₂ (s) + 3 (NH₄)₂SO₄ (aq)

The precipitate is (A) Cobalt (II) Phosphate , Co₃(PO₄)₂