With reference to ionic compounds, consider the following statements.
A. Only 1
B. Only 2
C. Both 1 and 2
D. Neither 1 nor 2
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Which one among the following is a covalent compound?
A. Calcium chloride
B. Magnesium fluoride
C. Sodium chloride
D. Carbon tetrachloride
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Examples of ionic bond are
A. NaCl, KCl, MgF2 , CaCl2
B. H2 , Cl2 , O2 , N2 , CH2
C. SO2 , SO3 , O3
D. H2 O, NH3
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Which of the following elements has three valence electrons?
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The variable valency indicates . . . . . . . .?
A. valence electrons
B. transition elements
C. group elements
D. alkaline element
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Assertion (A) Double bond cause more repulsion than single bonds.Reason (R) Triple bonds cause more repulsion than a double bond.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true, but R is false
D. A is false, but R is true
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Number of electrons participate in bonding in N2 .
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Electrovalent bond formation depends on
A. ionisation energy
B. electron affinity
C. lattice energy
D. All of the above
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What is the valency of aluminium in Al2 O3 ?
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An element 'A' forms oxides with the formula Al2 O3 . What is the valency of element A?
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What is the number of π and σ bonds in benzene?
A. 3π and 12σ
B. 3π and 3σ
C. 6π and 3σ
D. 12π and 3σ
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What is the valency of copper in cuprous oxide?
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Often the positive elements have valency.-
A. 0, 1, 2
B. 4, 3, 2
C. 2, 1, 0
D. 1, 2, 3
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The atomic number of magnesium is 12. What will be its valency?
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Which of the following is a property of an ionic compound?
A. It has a high melting point and boiling point
B. It is hard and does not break easily
C. It conducts electricity in the solid state
D. It is soluble in solvents such as kerosene and petrol
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Liquid water is denser than ice due to
A. higher surface tension
B. hydrogen bonding
C. vander Waals' force
D. covalent bonding
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Molten NaCl is a good conductor of electricity is due to
A. free electrons
B. free ions
C. free molecules
D. None of these
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If formula of sodium salt of an anion X is Na2 X, then the formula of its aluminium salt would be
A. AlX
B. AlX3
C. Al2 X3
D. Al3 X2
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Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled . . . . . . . . shell.
A. outermost
B. proper
C. inner most
D. centre
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The element X is a tetravalant and the element Y is a bivalent . The compound formed by these two elements will be . . . . . . . .
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