Chemical Symbols
Trending Questions
Q.
What is a chemical symbol of an element? What information does it convey?
Q. The chemical symbol of magnesium is
- Mg
- Mn
- Mo
- M
Q.
Calculate the amount of oxygen gas required and magnesium oxide formed when 60g of magnesium is burned completely in oxygen.
Q. Which of the following symbol represents chlorine?
- C
- Cr
- Cl
- Co
Q. Question 4
The chemical symbol for sodium is
(a) So
(b) Sd
(c) NA
(d) Na
The chemical symbol for sodium is
(a) So
(b) Sd
(c) NA
(d) Na
Q. Which among the following is the chemical symbol for iron?
- K
- Fe
- Zn
- Na
Q. The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is:
- 23
- 22
- 20
- 21
Q. An organic compound contains 40.65% carbon, 8.55% hydrogen and 23.77% nitrogen. Its vapour density is 29.5. Find its molecular formula.
Q.
Differentiate between atoms and ions.
Q. Dalton's atomic theory states that matter is made up of indivisible particles called atoms.
- True
- False
Q.
Point out the mistakes in the following and correct them.
Q. What is denoted by the chemical formula S8.
Q.
Potassium and phosphorus are represented by the symbols ______ and ______ respectively.
- Pt; P
- K; P
- Pt; Ph
- P; Ph
Q. [TQB.VIII(3)]
State the Gay Lussac’s law of combining volumes, explain with an illustration.
State the Gay Lussac’s law of combining volumes, explain with an illustration.
Q. List the characteristics of cork. How are they formed? Mention their role.
a) Write the formula of
a) Write the formula of
(i) Magnesium hydroxide
(ii) Hydrogen sulphide
(iii) Potassium chloride
(iv) Calcium oxide
(v) Barium chloride
(vi) Ammonium sulphate
b) Calculate the number f moles (i) 64g of oxygen atom (ii) 24.066×1023 number of oxygen atom. (at. mass of oxygen = 16u )
(ii) Hydrogen sulphide
(iii) Potassium chloride
(iv) Calcium oxide
(v) Barium chloride
(vi) Ammonium sulphate
b) Calculate the number f moles (i) 64g of oxygen atom (ii) 24.066×1023 number of oxygen atom. (at. mass of oxygen = 16u )
Q. Match the following elements with their respective symbolic representations.
- Au
- Pb
- Ag
- P
Q. W is the symbol for ______.
- silver
- gold
- tungsten
- aluminium
Q. Which of the following contains maximum number of molecules?
- 4 gm of hydrogen
- 22.4 L of oxygen at S.T.P.
- CO2 obtained by heating 1 mole of calcium carbonate
- 4 g of helium
Q. Which of the following are in accordance with Dalton’s atomic theory?
- Atoms are indivisible and indestructible
- Atoms are indivisible
- Atoms are divisible
- Atoms are indestructible
Q.
Potassium and phosphorus are represented by the symbols ______ and ______ respectively.
- Pt; P
- K; P
- Pt; Ph
- P; Ph
Q. Write the formula of ionic compound with monovalent polyatomic cation and divalent monoatomic anion of sulphur.
Q. The chemical symbol of magnesium is
- Mg
- Mn
- Mo
- M
Q. The mass of an electron is less than that of a
- sodium
- hydrogen
- carbon
