For which of the following measurements are the significant? I. 0.0038 m II. 5.0

Question

For which of the following measurements are the significant? I. 0.0038 m II. 5.04 cm III. 800. L IV. 3.0 times 10 kg V. g (A) only II (B) I, II and III (C) II, III and IV (D) IV and V Which of the following pairs of atoms and or ions are isoelectronic with one another? (A) I (B) II (C) IV (D) III In which of the following lists are the elements arranged in increasing atomic (smallest to largest)? I. F, N, O II. Ca, K, Li III. P, As (A) Only III (B) Only II (C) I and II (D) II and III The correct name for the compound with the formula is (A) Tribromo aluminum (B) Aluminum tribromide (C) Aluminum bromide (D) None of the above Consider the following list of elements: Ca, Br, Cu, Zn, K, The number of these elements that form positive ions (cations) is (are) (A) one (B) two (C) three (D) four The answer to the division of 5.010/5.07 reported to the proper number of significant figures is (A) 0.989 (B) 0.988 (C) 9.88 (D) 0.9881 The answer to the addition 4.26 + 3.831 reported to the proper number of significant figure is (A) 8.091 (B) 8.1 (C) 8.09 (D) 8.01 (E) 8.10 Based on the Lewis electron dot representation of H_2O the molecular shape is: (A) Linear (B) Trigonal planar (C) Trigonal pyramidal (D) Bent (or Angular) The molar mass of potassium phosphate (K_3PO_4) is (A) 212.27 amu (B) 212.27 g (C) 218.62 g (D) 218.62 amu

Explanation / Answer

(14)

(B) II both S2- and Cl- have 18 electrons

(15)

(A) Only III N, P and As belongs to 15 th group. form top to bootom in group atomic size will increase.

(16)

(C) Aluminium bromide

(17)

(D) 4 Ca2+, Cu2+,Zn2+ and K+

(18)

(B) 0.988

(19)

(C) 8.09

(20)

(D) Bent or angular

(21)

(B) 212.27 g.

K3PO4

3(39)+31+4(16) = 212 g/mol

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