1) Identify the poly atomic molecule *
1 point
chlorine
oxygen
sulphur
2) Ratio by mass of magnesium sulphide is *
1 point
5:2
3:4
2:5
3) Atomic weight of chlorine *
1 point
35.5
35.4
33.5
4) A group of atoms carrying a charge is known as *
1 point
monoatomic ion
diatomic ion
5) Which is the tetra atomic ion? *
1 point
Helium
oxygen
phosphorous
6) Ratio by mass of hydrogen in ammonia molecule is *
1 point
3
4
14
7) Positively charged ions are called as *
1 point
cation
anion
none of the above
8) Identify the element with more than one valency *
1 point
copper
sodium
potassium
9) Charge of phosphate ion *
1 point
-2
-3
-4
10) Which exists as the negative ion in the following ? *
1 point
sodium
calcium
sulphur
11) Identify the poly atomic ion with positive charge *
1 point
ammonium
sulphate
carbonate
12) Formula of nitride is *
1 point
N3-
N4-
N2-
13) Atomic weight of Sodium is*
1 point
23
24
25
14) Ratio by mass of the constituents in magnesium sulphide *
1 point
4:3
3:4
3:3
15)which is the ionic compound in the following ? *
1 point
NaCl
H2O
HCl
16) Atoms of different elements join together to form *
1 point
ions
compounds
molecules
17) Atomicity of Ozone is *
1 point
2
3
4
18) Atomic weight of Sulphur is*
1 point
34
33
32
19) Ratio by mass of the constituents in carbon di oxide is *
1 point
4: 8
3:8
3:6
This is a required question
20) What is the valency of Zinc? *
1 point
3
2
4
Answers
Answer:
) Identify the poly atomic molecule *
1 point
chlorine
oxygen
sulphur
2) Ratio by mass of magnesium sulphide is *
1 point
5:2
3:4
2:5
3) Atomic weight of chlorine *
1 point
35.5
35.4
33.5
4) A group of atoms carrying a charge is known as *
1 point
monoatomic ion
diatomic ion
5) Which is the tetra atomic ion? *
1 point
Helium
oxygen
phosphorous
6) Ratio by mass of hydrogen in ammonia molecule is *
1 point
3
4
14
7) Positively charged ions are called as *
1 point
cation
anion
none of the above
8) Identify the element with more than one valency *
1 point
copper
sodium
potassium
9) Charge of phosphate ion *
1 point
-2
-3
-4
10) Which exists as the negative ion in the following ? *
1 point
sodium
calcium
sulphur
11) Identify the poly atomic ion with positive charge *
1 point
ammonium
sulphate
carbonate
12) Formula of nitride is *
1 point
N3-
N4-
N2-
13) Atomic weight of Sodium is*
1 point
23
24
25
14) Ratio by mass of the constituents in magnesium sulphide *
1 point
4:3
3:4
3:3
15)which is the ionic compound in the following ? *
1 point
NaCl
H2O
HCl
16) Atoms of different elements join together to form *
1 point
ions
compounds
molecules
17) Atomicity of Ozone is *
1 point
2
3
4
18) Atomic weight of Sulphur is*
1 point
34
33
32
19) Ratio by mass of the constituents in carbon di oxide is *
1 point
4: 8
3:8
3:6
This is a required question
20) What is the valency of Zinc? *
1 point
3
2
4
Answer:
Key Points
Polyatomic molecules consist of a stable system (bound state) comprising three or more atoms.
The molecular formula characterizes different molecules by reflecting their exact number of compositional atoms.
The empirical formula is often, but not always, the same as the molecular formula.
Term
empirical formulaa notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers
Polyatomic molecules are electrically neutral groups of three or more atoms held together by covalent bonds. Molecules are distinguished from ions by their lack of electrical charge.
Molecular Chemistry and Molecular Physics
The science of molecules is called molecular chemistry or molecular physics, depending on the focus. Molecular chemistry deals with the laws governing the interaction between molecules resulting in the formation and breakage of chemical bonds; molecular physics deals with the laws governing their structure and properties. In molecular sciences, a molecule consists of a stable system (bound state) comprising two or more atoms. Molecules have fixed equilibrium geometries—bond lengths and angles—about which they continuously oscillate through vibrational and rotational motions.
A pure substance is composed of molecules with the same average geometrical structure. A molecule’s chemical formula and structure are the two important factors that determine its properties, particularly reactivity.
A compound’s empirical formula is the simplest integer ratio of its constitutional chemical elements. For example, water is always composed of a 2:1 ratio of hydrogen to oxygen atoms