How are elements numbered 90 to 103 in the periodic table called? a) Alkali b) A
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How are elements numbered 90 to 103 in the periodic table called? a) Alkali b) Actinons c) Earth metals d) Transition elements What is defined as a value equal to the number of gram moles of solute per 1000 grams of solvent? a) Molality b) Normality c) Molarity d) Formality Which of the following is NOT a part of an atom? a) Electron b) Proton c) Neutron d) Coulomb An element maybe define as a substance, all atoms of which have the same: a) Number of neutrons b) Radioactivity c) Atomic weight d) Atomic number How does all B families and group VIII in the periodic table named? a) Light metals b) Rare earth metals c) Non-metals d) Transition metals The device which measures the acid content of the cell is called _____. a) Acid meter b) Hydrometer c) Hygrometer d) Pyrometer The vertical columns in the periodic table are called: a) Groups b) Sections c) Families d) Families What term is used to refer to a negatively charged ion? a) Anion b) Cathode c) Anode d) Cation In a copper atom, the valence ring contains: a) No electron b) One electron c) Two electron d) Four electrons The elements along the dark line in the periodic table are referred to as _____. a) Light metals b) Metalloids c) Non-metals d) Heavy metals What do you call an atom that losses some of its electron or accepts extra electrons from another atom? a) intrinsic b) Mole c) Neutron d) Ion A _____ is a cell designed to produce electric current and can be recharged a) Secondary cell b) Electrolytic cell c) Chemical cell d) Battery Which of the following groups in the periodic table the mostly strongly electronegative elements? a) Group IV b) Group V c) Group VIIA d) Group VIA Which of the following statement is FALSE? a) In general, as reaction products are formed, they react with each other and reform reactants. b) At equilibrium, the net reaction rate is aero. c) The differential rate is the mathematical expression that shows how to rate of a reaction depends on volume d) The net rate at which a reaction proceeds from left to right is equal to the forward rate minus the reverse rate. What is the smallest part of matter? a) Molecule b) Element c) Particle d) Atom.Explanation / Answer
Solution:
81) (b) The elements numbered 90 to 103 are called as actinides.
82) (a) Molality is defined as a value equl to the number of gram moles of solute per 1000 gms of solvent
83) (d) Coulomb is not a part of an atom.
84) (d) An element may be defined as a substance all atoms of which have the same atomic number.
85) (c) Group VIII in the periodic table named as non-metals.
86) (b) Hydrometer is used to measure the specific gravity of the cell. Hence it is used to measure the acid content of the cell.
87) a) the vertical columns in the periodic table are called groups.
88) a) Anion term is used to refer to a negatively charged ion.
89) b) in Coper atom, there are total 4 rings. 1st ring contains 2 electros, 2nd rings contains 8 electrons, and 3rd rings contains 18 electrons. Hence the valence ring contains only 1 electron.
90) (b) Elements along the dark lines in the periodic table are refered to as metalloids.
91) (d) an atom that looses some electrons or accepts extra electron from another atom is called ion.
92) a) A secondary cell is a cell designed to produce electric current and can be recharged.
93) c) Group VIIA has the strongest electronegatove elements-Fluorine.
Then group VIA has the stronger electronegative element-Oxygen.
Then Group V has the strong electronegative element-Nitrogen.
In fact order of electronegativity among N, O and F is F>O>N.
94) c) it is False.
95) c) Particle is the smallest part of matter.
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