The sulfur atoms has a formal charge of zero in which structure for sulfuric aci
ID: 524727 • Letter: T
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The sulfur atoms has a formal charge of zero in which structure for sulfuric acid Based on its position on the periodic table, it is reasonable to predict that (atomic number - 81) is (A) likely to form a stable Tl^2+ ion. (B) electronically nonconductive (C) gaseous at standard temperature and pressure. (D) malleable What could this picture represent? (A) pure element (B) pure compound (C) homogeneous mixture (D) heterogeneous mixture What is the net ionic equation for the reaction of aqueous solution of Na_2PO_4 and Cu(NO_3)_2? Which bond is the most polar? (A) H-N (B) H-Ct (C) H-Si (D) H-P What are the approximate bond angles around the indicated carbon? (A) 90 degree (B) 109.5 degree (C) 120 degree (D) 180 degree What id the number of lone pairs on the central atoms in the Lewis structure of ? (A) 0 (B) 1 (C) 2 (D) 3 How many significant figures are there in the results of 5.52 dividend by 3.745? (A) 6 (B) 5 (C) 4 (D) 3 How many protons (p), neutron (n), and electrons does have? (A) 17p, 18n, 19e (B) 17p, 18n, 18e (C) 17p, 19 n, 18e (D)35 p, 17 n, 18 e Albert Einstein's explanation of the photoelectric effect confirmed which of the following concepts? (A) Electrons can absorb energy and change levels in atoms (B) Light energy can be converted into the mass of electrons. Electrons have both particle and wave properties (D) Light has both particle and wave properties An organic compound that has the empirical formula CHO has a molecular mass of 145 amu. Its molecular formula is? (A) C_2H_2O_2 (B) C_ H_ O_4 (C) C_3 H_ O_3 (D) C_ H_ O_ What is the mass (g) of one molecule of the compound C_8H_ O_2? (A) 148 g (B) 3.16 times 10^-22 g (C) 4.07 times 10^21 g (D) 2.46 times 10^-22 g Which of the following ionic compounds has the most negative lattice energy? (A) KBr (B) NaCl (C) NaBr (D) KCl All the reactions below represent oxidation-reduction process EXCEPT the (A) combustion of tin in chlorine gas (B) decomposition of potassium chlorate (C) neutralization of sodium hydroxide (D) reactions of magnesium with hydrochloric acid.Explanation / Answer
(14) (A)
Formal charge = number of valence electrons - number of lone pair of electrons - number of bonds
For sulphur in structure (A) is = 6 - 0 - 6 = 0
(15) (A) Likely to form Tl3+ ion to get stability.
(16) (A) Pure elements. There is a group of similar atoms.
(17) (D)
2 Na3PO4(aq.) + 3 Cu(NO3)2 (aq.) --------> Cu3(PO4)2 (s) + 6 NaNO3 (aq.)
Complete ionic equation:
6Na+(aq.)+2PO43-(aq.)+3Cu2+(aq.)+6NO3-(aq.)--->Cu3(PO4)2(s)+6Na+(aq.)+6NO3-(aq.)
Net Ionic Equation:
2 PO43- (aq.) + 3 Cu2+ (aq.) --------------> Cu3(PO4)2 (s)
(18) (A) H - N. Because of more electronegativity difference between N and H
(19) (C) 1200. This carbon undergoes sp2 hybridisation.
(20) (D) 3 lone pairs on there on central I.
(21) (D) 3 . (5.52/3.745, least significant figures = 3)
(22) (B) 17 p, 18 n, 18 e
(23) (C) Electrons have both particle and wave nature.
(24) (C)
n = molecular mass / emperical formula mass = 145 / 29 = 5
Molecular formula = (CHO)n = (CHO)5 = C5H5O5
(25) Mass of one molecule = molar mass / avagador's number
(26) (A) KBr
(27) (C) Neutralisation reaction
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