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- 1. Multiple Choice
What is valency of sodium?
1
2
3
4
- 2. Multiple Choicesubatomic particles found on the outermost shell & responsible for the atom's reactivityneutronsvalence electronsisotopesions
- 3. Multiple ChoiceValue representing the number of protons in an elementAtomic MassMass NumberValence ElectronsAtomic Number
- 4. Multiple Choice
WHICH ONE IS A MIXTURE?
BLOOD
CARBON DIOXIDE
SILICON
SODIUM
TIN
- 5. Multiple Choice
What is the solute in the soda water?
Water
Carbon dioxide
Sugar
Oxygen
- 6. Multiple ChoiceWhat are the basic building blocks for all matter?atomselementscompoundschemicals
- 7. Multiple ChoiceAn oxygen molecule usually has two oxygen atoms.TrueFalse
- 8. Multiple Choice
Aluminium has 13 protons, 1 neutrons, 13 electrons. What is the atomic number?
26
1
13
12
- 9. Multiple Choice
Methane has _____ atoms
1
3
4
5
- 10. Multiple Choice
molecular formula of copper and bromine is
CuBr2
CUBR
Cu2Br
CuBr
- 11. Multiple Choice
Atomicity of phosphorus namaste is
monoatomic
Diatomic
poly atomic
tetra atomic
- 12. Multiple Choice
H2SO4 Is the chemical formula of......
Hydrogen Chloride
Sulfuric acid
Nitric acid
Carbonic acid
- 13. Multiple Choice
Valency of inert gas elements.
0
2
1
3
- 14. Multiple Choice
What happens when salty water is boiled?
The salt becomes a new compound and water evaporates as it has a low boiling point
The water evaporates and the salt remains in the beaker as it has a high melting point
The water becomes a new compound and evaporates while salt remains in the beaker
The water will disappear and the salt remains in the beaker as it is a solid
- 15. Multiple Choice
Which of the following separations cannot be carried out using a centrifuge? The separation of:
water from wet clothes
cream from milk
red blood cells from plasma
salt from sea water
- 16. Multiple Choice
Complete the sentence:
___________ allows to separate the fine flour particles from bigger impurities (lumps).
Filtration
Decantation
Sieving
Magnetism
- 17. Multiple Choice
In a coffee machine, the ground coffee is separated from the coffee solution by using..
sand paper
filter paper
toilet paper
tissue paper
- 18. Multiple ChoiceIron fillings can be separated from iron and Sulphur mixture bysedementationheatingmagnetic attractionseiving
- 19. Multiple ChoiceCan you separate salt from water using filtration?yesno
- 20. Multiple ChoiceWhat is the relative molecular mass of fluorine gas, F2?1938918
- 21. Multiple ChoiceWhat is the relative formula mass of NaOH?20394045
- 22. Multiple Choice
Name the compound PH3.
Triphosphorus trihydride
Phosphorus hydride
Trihydrogen monophosphide
Phosphorus trihydride
- 23. Multiple Choice
Which of these have mass 44 u?
H2O
H2O2
P2O5
CO2
- 24. Multiple Choice
Element with atomic number 8 is
Carbon
Nitrogen
Oxygen
Fluorine
- 25. Multiple ChoiceWhat is the molar mass of table salt (NaCl)?116.886 g/mol35.453 g/mol22.990 g/mol58.443 g/mol
- Answer choicesTagsAnswer choicesTags