Question 41 : When an ionic compound is dissolved in water, the ions in solution can best be described as
1. dehydrated ions and molecules
2. hydrated molecules only
3. hydrated ions only
4. both hydrated molecules and hydrated ions
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Question 42 : A strontium atom differs from a strontium ion in that the atom has a greater
1. number of protons
2. number of electrons
3. atomic number
4. mass number
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Question 43 : Which substance has a polar covalent bond between its atoms?
1. K₃N
2. NaCl
3. NH₃
4. Ca₃N₂
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Question 44 : the molecule having one unpaired electron is:
1. CO
2. NO
3. O₂
4. CN^-
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Question 45 : Which formula represents a molecular substance?
1. Al₂O₃
2. CO
3. CaO
4. Li₂O
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Question 46 : Which sequence of Group 18 elements demonstrates a gradual decrease in the strength of the Van der Waals forces? All the choices are elements in the liquid state.
1. Kr, Xe, Ar, Ne
2. Ne, Ar, Kr, Xe
3. Xe, Kr, Ar, Ne
4. Ar, Kr, Ne, Xe
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Question 47 : carbon tetrachloride has no net dipole moment because of
1. its planar structure
2. its regular tetrahedral structure
3. similar sizes of carbon and chlorine atoms
4. similar electron affinities of carbon and chlorine
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Question 48 : The ion that isoelectronic with CO is
1. CN-
2. O2+
3. O2-
4. N2+
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Question 49 : Which substance is an example of a network solid?
1. silicon dioxide
2. nitrogen dioxide
3. sulfur dioxide
4. carbon dioxide
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Question 50 : The bond between two identical non-metal atoms has a pair of electrons:
1. transferred fully from one atom to another
2. with identical spins
3. unequally shared between the two.
4. equally shared between them
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