Which of the following sets have only on...

Which of the following sets have only one subset

A

a){0}

B

b)`{phi,0}`

C

c)`{phi}`

D

d){1}

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Which of the following sets represent only elctrophiles-

A

`BF_(3) , NH_(3) , H_(2)O`

B

`AICI_(3) , SO_(3) , overset(oplus)(N)O_(2)`

C

`overset(oplus)(N)O_(2)overset(oplus)(C)H_(3),CH_(3)overset(oplus)(C)O`

D

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Which of the following contains only one unpaired electron in the valence shell?

A

`"_18Na`

B

`"_21Sc`

C

`"_9F`

D

`"_7N`

State which of the following sets is an infinite set?

A

`A={x:x" is an integer and "-1 le x lt1}`

B

B= set of negative even integers greater than (-100)

C

C=set of positive integers less than 100

D

`D={x:x " is real and "-1 lex lt1}`

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