-1. [4] The basic requirement for a ligand is a. unpaired electrons b. lone pair
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-1. [4] The basic requirement for a ligand is a. unpaired electrons b. lone pairts) of electrons (Le., unbonded pairs) e. a positively charged counterion d. charges 2. [4] A radioactive isotope has a half-life of five years. After 25 years, how much of an 80 gram sample remains? a. 80. b 2.5 10. d. 40. 8 3. [4] The splitting ofa larger nucleus into two lighter nuclei is known as a. atomic combustion b. a chain reaction c. fusion d. fission 4·14) The loss of a beta particle by p results in c. 5. [4] Aromatic hydrocarbons contain a. essential oils b. a benzene ring c.a C-o-c group d. a COOH group 6. [4) "Saturation" in reference to hydrocarbons means a. no multiple bonds b. at least one multiple bond c. contains as much solute as the solvent can hold d. dripping with water 7. [4] Ester, ethers, and carboxylic acids all contain, at a minimum, which elements? a. carbon, hydrogen, chlorine b. carbon, hydrogen, oxygen, nitrogen c carbon, hydrogen, nitrogen d. carbon, hydrogen, oxygenExplanation / Answer
1) the basic requirement of ligand is having a lone pair of electrons.
OPtion B
2) half life of radioactive disintegration is independent of initial concentration(first order kinetics).
and th eamount remaining is given by
[A]t = [A]0 /2n where n = number of half lives
half life = 5 yrs and n = 25/5 = 5
Thus amount remaining [A]t = 80g / 25
= 80/32= 2.5 g
option B
3) the splitting of larger nuclei into two lighter nuclei of approximately similar mass is called NUCELAR FISSION.
OPtion D
4) on beta emission, the mass number remains same but atomic number increases by one unit,.
thus 93Np changes to 94 Pu with same mass number
OPTION
5)Aromatic hydrocarbons containsa BENZENE RING. option B
6) Saturation in Hydrocarbons is NO MULTIPLE BONDS, option A
7) optionD
contain minimum C, H and O
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