1) which element is most likely to be found uncombined in nature? a) Kr b) Cr c)

Question

1) which element is most likely to be found uncombined in nature?

a) Kr

b) Cr

c)Br

d) Sr

2) as the Ca atom becomes Ca+2 ion the atom _________?

a) gained two protons

b) gained two electrons

c) lost two protons

d) lost two electrons

3) Which is the most common property of all liquids?

a) defined shape

b) defined volume

c) high vapor pressure

d) B and C are correct

4) how many moles of O are in 212 g of CaCO3?

5) in the formula Mg3(PO3)2 there are _____ O2 atoms.

6) In the bond, C triple bond to N the atoms are sharing __________ electrons?

Explanation / Answer

1) answer : a) Kr

reason : it is inert gas so it occur in the nature as free state

2) answer :d) lost two electrons

explanation: loss of electrons leads to formation of cation.

3) answer : b) defined volume

4) moles of CaCO3 = mass / molar mass

= 212 / 100

= 2.12

5) number of O atoms =6

6) 6 electrons

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