est l. Multiple Choices: write the correct LETTER of your choice in your booklet
ID: 1082400 • Letter: E
Question
est l. Multiple Choices: write the correct LETTER of your choice in your booklet. (1 mark each = 15) 1, Compound is a combination of two or more substances chemically combined together. Which of the following is a compound? A, salt B, titanium c, carbon D. aluminum 2. Mixture is a combination of two or more substances physically mixed together in varied proportion. Which of the following is a homogeneous mixture? A, oil in water B, brass C. sodium chloride D. nitrogen 3. The name for this given isotope of hydrogen1 A, protium is C. Proton 8, Tritium D. Deuterium 4. It is a subatomic particde which is equal to mass number minus proton. A, proton B. electron C proton and nucleus D. neutrorn 5. What do the following have in common? (a) (b) They are isotopes of each other. They are isomers of each other. They are isoelectronic with each other. They are different elements so they have nothing in common.Explanation / Answer
Answer:
1.A. Salt
Explanation:
Given all other options are Pure atoms.
Salt is Combination of sodium (Na) and Choloride (Cl) ion these two substances mixed together to form salt .so this is odd one for others.
2. B.brass
Explanation:
Chemical substances mixed after homogeneous mixture only possible in brass ,all other it don't come.
If you take oil and water it again hetrogenius mixture, Nitrogen homogeneous but it is same substances,again sodium chloride is hetrogenius mixture.
3.D. Deuterium
We already know, 1H1 is protium ,1H3 is tritium so finnaly given one is duetrium.
4.D. neutron
A= p+n
A- mass number
P-proton
n - neutron
A-p = neutron.
5. C. They are isoelectronic with each other.
Because Ne have 10 elctrone ,F- ion also have 10 electron,similarly Mg 2+ ion also 10 electron so this is correct answer.
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