Question 11 Mark
Write the symbols/ formulae of two simple ions and two compound ions (or polyatomic ions).
Answer
View full question & answer→Write the symbols/ formulae of two simple ions and two compound ions (or polyatomic ions).
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Question 21 Mark
Write the relation between nanometer and metre.
Answer
View full question & answer→The relation between nanometer and meter is 1 nanometer = 10−9m.
Question 31 Mark
Write the molecular formulae for the following compounds.
Mercury (II) chloride.
Mercury (II) chloride.
Answer
View full question & answer→It consists of one mercury (II) cation (Hg+2) and two chloride anions (Cl-1). The molecular or chemical formula of Mercury (II) chloride is HgCl2.
Question 41 Mark
Write the molecular formulae for the following compounds.
Magnesium (II) acetate.
Magnesium (II) acetate.
Question 51 Mark
Write the molecular formulae for the following compounds.
Iron (III) sulphide.
Iron (III) sulphide.
Answer
View full question & answer→Oxidation state of sulphide is −2 and that of iron is given as +3. Therefore, to balance the charges, molecular formula will be Fe2S3.
Question 61 Mark
Write the molecular formulae for the following compounds.
Copper (II) bromide.
Copper (II) bromide.
Question 71 Mark
Write the molecular formulae for the following compounds.
Calcium (II) phosphate.
Calcium (II) phosphate.
Question 81 Mark
Write the molecular formulae for the following compounds.
Aluminium (III) nitrate.
Aluminium (III) nitrate.
Answer
View full question & answer→The molecular formula of the compound is Al NO 3 3 .
Question 91 Mark
Write the ions present in:
- Al2(CO3)3
- AlBr3
Answer
View full question & answer→- 2 ions of Al3+
3 ions of CO32-
Hence total no. of ions = 5
- The ions present in AlBr3 are aluminum ion (Al3+) and bromide ions (Br1-)
Question 101 Mark
Write the full form of IUPAC.
Answer
View full question & answer→International Union of Pure and Applied Chemistry
Question 111 Mark
Write the formula of the following compound:
Sodium phosphate.
Sodium phosphate.
Answer
View full question & answer→The formula of sodium phosphate is Na 3 PO 4 .
Question 121 Mark
Write the formula of the following compound:
Sodium bromide.
Sodium bromide.
Answer
View full question & answer→Sodium Bromide is an inorganic compound with the chemical formula NaBr.
Question 131 Mark
Write the formula of the following compound:
Potassium nitrate.
Potassium nitrate.
Answer
View full question & answer→Potassium nitrate: KNO3
Question 141 Mark
Write the formula of the following compound:
Magnesium sulphate.
Magnesium sulphate.
Answer
View full question & answer→Magnesium sulphate: MgSO4.
Question 151 Mark
Write the formula of the following compound:
Calcium chloride.
Calcium chloride.
Answer
View full question & answer→Calcium chloride: CaCl2
Question 161 Mark
Write the formula of lead phosphate.
Answer
View full question & answer→Chemical formula of Lead Phosphate is Pb3(PO4)2.
Question 171 Mark
Write the chemical formula using criss-cross method:
Magnesium bicarbonate.
Magnesium bicarbonate.
Answer
View full question & answer→The Criss cross method is shown below: The atomic number of magnesium is 12, and the valency of magnesium is two, while the valency of bicarbonate is one. To satisfy the valency of the magnesium atom, it requires two bicarbonates. Therefore, the correct formula of magnesium bicarbonate is M g ( H C O 3 ) 2 .
Question 181 Mark
Write the chemical formula using criss-cross method:
Barium nitrate.
Barium nitrate.
Question 191 Mark
Write the chemical formula using criss-cross method:
Ammonium sulphate.
Ammonium sulphate.
Answer
View full question & answer→Ammonium sulphate (NH4)2 + (SO4)1
Cross multiply (NH4)1 (SO4)2 = (NH4)2SO4
Cross multiply (NH4)1 (SO4)2 = (NH4)2SO4
Question 201 Mark
Write the chemical formulae of the following:
Magnesium chloride.
Magnesium chloride.
Answer
View full question & answer→The chemical formula for Magnesium chloride is MgCl2.
Question 211 Mark
Write the chemical formulae of the following:
Copper nitrate.
Copper nitrate.
Answer
View full question & answer→Copper nitrate → Cu (NO3)2.
Question 221 Mark
Write the chemical formulae of the following:
Calcium oxide.
Calcium oxide.
Answer
View full question & answer→Calcium oxide → CaO.
Question 231 Mark
Write the chemical formulae of the following:
Calcium carbonate.
Calcium carbonate.
Answer
View full question & answer→Calcium carbonate → CaCO3.
Question 241 Mark
Write the chemical formulae of the following:
Aluminium chloride.
Aluminium chloride.
Answer
View full question & answer→Aluminium chloride → AlCl3.
Question 251 Mark
Write the chemical formulae and names of the compounds formed by the following ions:
Pb2+ and NO3–
Pb2+ and NO3–
Answer
View full question & answer→Pb2+ and NO3- : Pb(NO3)2 = Lead nitrate.
Question 261 Mark
Write the chemical formulae and names of the compounds formed by the following ions:
Mg2+ and CO32–
Mg2+ and CO32–
Answer
View full question & answer→Mg2+ and CO32–: MgCO3 = Magnesium carbonate.
Question 271 Mark
Write the chemical formulae and names of the compounds formed by the following ions:
Cr3+ and SO42–
Cr3+ and SO42–
Answer
View full question & answer→Cr3+ and SO42- : Cr2(SO4)3 = Chromium sulphate.
Question 281 Mark
Write the atomicity of the following:
S8
S8
Answer
View full question & answer→S8: The atomicity of S8 is 8 because it contains 8 atoms of Sulphur.
Question 291 Mark
Write the atomicity of the following:
Na2SO4
Na2SO4
Answer
View full question & answer→The Atomicity of Na2SO4 is 7.
Question 301 Mark
Write the atomicity of the following:
H2S
H2S
Answer
View full question & answer→H2S: The Atomicity of H2S is 3 because it contains 2 atoms of hydrogen and one atom of Sulphur.
Question 311 Mark
Write the atomicity of the following:
HNO3
HNO3
Answer
View full question & answer→In HNO3 , there are three atoms of oxygen, one atom of nitrogen and one atom of hydrogen sulphur constituting a molecule of HNO3 . Hence, the atomicity is five.
Question 321 Mark
Write down the names of Q compounds represented by the following formulae:
K2 SO4
Answer
View full question & answer→K2SO4→ Potassium sulphate.
Question 331 Mark
Write down the names of Q compounds represented by the following formulae:
Al2(SO4)3
Question 341 Mark
Write down the names of Q compounds represented by the following formulae:
KNO3
KNO3
Question 351 Mark
Write down the names of Q compounds represented by the following formulae:
CaCO3.
CaCO3.
Answer
View full question & answer→CaCO3 represents the compound calcium carbonate.
Question 361 Mark
Write down the names of Q compounds represented by the following formulae:
CaCl2
CaCl2
Answer
View full question & answer→CaCl2→ Calcium chloride.
Question 371 Mark
Write down the formulae of.
sodium suphide.
sodium suphide.
Answer
View full question & answer→sodium suphide.
Question 381 Mark
Write down the formulae of.
sodium oxide.
sodium oxide.
Answer
View full question & answer→Sodium oxide
Question 391 Mark
Write down the formulae of.
magnesium hydroxide.
magnesium hydroxide.
Answer
View full question & answer→magnesium hydroxide.
Question 401 Mark
Write down the formulae of.
aluminium chloride.
aluminium chloride.
Question 411 Mark
Write down the formulae for the following compounds:
Magnesium hydroxide
Magnesium hydroxide
Answer
View full question & answer→Magnesium hydroxide: Mg(OH)2
Question 421 Mark
Write down the formulae for the following compounds:
Calcium oxide.
Calcium oxide.
Answer
View full question & answer→The chemical formula of calcium oxide is C a O.
Question 431 Mark
Work out the formula for sulphur dioxide.
(Valencies: S = 4; O = 2)
(Valencies: S = 4; O = 2)
Answer
View full question & answer→$\ \text{Symbols}:\ \ \ \ \ \text{S}\ \ \ \ \ \ \ \ \ \text{O}\\ {\text{Valencies}}:\ +4\ \ \ \ -2$
Chemical formula of sulphur dioxide is SO2
Chemical formula of sulphur dioxide is SO2
Question 441 Mark
Work out the formula for magnesium hydrogencarbonate.
Answer
View full question & answer→A compound, Mg(HCO3)2, that is stable only in solution. It is formed by the action of carbon dioxide on a suspension of magnesium carbonate in water:MgCO3(s)+CO2(g)+H2O(l) → Mg(HCO3)2(aq) On heating, this process is reversed.
Question 451 Mark
Work out the formulae for the following compounds:
Sodium oxide.
Sodium oxide.
Answer
View full question & answer→The chemical formula for sodium oxide is Na2O.
Question 461 Mark
Work out the formulae for the following compounds:
Calcium carbonate.
Calcium carbonate.
Answer
View full question & answer→Calcium carbonate:
$\ \text{Symbols}:\ \ \ \ \ \text{Ca}\ \ \ \ \ \ \ \ \ \text{CO}_3\\ {\text{Valencies}}:\ \ +2\ \ \ \ \ \ \ \ -2$
Thus, the resulting compound is CaCO3
Question 471 Mark
Why is it not possible to see an atom with the unaided eyes?
Answer
View full question & answer→Atoms are very tiny particles that are measured in nanometres. Hence they cannot be seen with the naked eye, but can only be seen under a microscope.
Question 481 Mark
Why is it not possible to see an atom with naked eyes?
Answer
View full question & answer→The size of an atom is so small that it is not possible to see it with naked eyes. Also, the atom of an element does not exist independently.
Question 491 Mark
Which unit is used to measure the atomic radius? Convert it into metre.
Answer
View full question & answer→Fermi unit is used to measure the atomic radius. 1 Fermi = 10-15 m.
Question 501 Mark
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
Answer
View full question & answer→The postulate which can explain the law of definite proportions is that the relative number and the kinds of atoms are constant in a given compound.