Chemistry
Match the statements - 1 to 10 below with their correct answers from - A to J.
| 1. Elements having valency of two | A: Br1- |
| 2. An anion | B: Divalent |
| 3. A gaseous non-metal | C: Reactants |
| 4. A cation | D: Ammonium |
| 5. The term used for the substances which take part in the chemical reaction | E: Nitric oxide |
| 6. The meaning of the symbol 'ꕔ' over the arrow in a chemical equation | F: Nitrogen |
| 7. The chemical name for nitrogen monoxide | G: Zero |
| 8. A radical containing nitrogen & hydrogen only | H: Nitrous oxide |
| 9. The chemical name for dinitrogen oxide | I: Heat required |
| 10. The valency of noble gases | J: K1+ |
Valency
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Answer
| 1. Elements having valency of two | B: Divalent |
| 2. An anion | A: Br1- |
| 3. A gaseous non-metal | F: Nitrogen |
| 4. A cation | J: K1+ |
| 5. The term used for the substances which take part in the chemical reaction | C: Reactants |
| 6. The meaning of the symbol 'ꕔ' over the arrow in a chemical equation | I: Heat required |
| 7. The chemical name for nitrogen monoxide | E: Nitric oxide |
| 8. A radical containing nitrogen & hydrogen only | D: Ammonium |
| 9. The chemical name for dinitrogen oxide | H: Nitrous oxide |
| 10. The valency of noble gases | G: Zero |
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Related Questions
Balance the following equations:
(a) P + O2 ⟶ P2O5
(b) Na2O + H2O ⟶ NaOH
(c) K + H2O ⟶ KOH + H2
(d) Fe + H2O ⇌ Fe3O4 + H2
(e) CaO + HCl ⟶ CaCl2 + H2O
(f) Fe + Cl2 + FeCl3
(g) Al + H2O ⟶ Al2O3 + H2
(h) Al + H2SO4 ⟶ Al2(SO4)3 + H2
(i) Fe2O3 + H2 ⟶ Fe + H2O
(j) C + H2SO4 ⟶ CO2 + H2O + SO2
(k) Pb3O4 ⟶ PbO + O2
(l) Al + O2 ⟶ Al2O3
(m) NO + O2 ⟶ NO2
(n) ZnS + O2 ⟶ ZnO + SO2
(o) Pb3O4 + HCl ⟶ PbCl2 + H2O + Cl2
(p) ZnO + NaOH ⟶ Na2ZnO2 + H2O
(q) H2S + Cl2 ⟶ S + HCl
(r) FeCl3 + NaOH ⟶ NaCl + Fe(OH)3
(s) Fe2O3 + CO ⟶ Fe + CO2
(t) KHCO3 ⟶ K2CO3 + H2O + CO2
(u) CuO + NH3 ⟶ Cu + H2O + N2
Complete the statements given below by filling in the blank with the correct word/s.
The formula of silver [I] chloride is …………… [AgCl/AgCl2].
The basic unit of an element is a/an …………… [molecule/atom/ion].
Atom contains ………….. [neutron/nucleus], with positively charged …………… [electrons/protons] .
Element ………….. [calcium/lead/carbon] has the symbol derived from its Latin name 'plumbum'.
From the elements - He, Br, Pt & O; the element which forms a polyatomic molecule is …………… & which is liquid at room temperature is ……………
The valency of iron in FeO is …………… [2+/1+] of chlorine [chloride] in CaCl2 is ………….. [1-/2-] and of dichromate in K2Cr2O7 is ………….. [2+/2-]
Match the compounds in List I - 1 to 20 with their correct formulas in List II - A to T.
List I 1. Copper [I] sulphide 2. Potassium permanganate 3. Phosphoric acid 4. Copper [I] oxide 5. Carbonic acid 6. Aluminium sulphide 7. Iron [II] oxide 8. Iron [III] sulphide 9. Iron [II] sulphate 10. Sodium zincate 11. Nitrous oxide 12. Aluminium sulphate 13. Magnesium nitride 14. Iron [III] sulphate 15. Copper [II] oxide 16. Iron [III] oxide 17. Nitric oxide 18. Copper [II] sulphide 19. Iron [II] sulphide 20. Magnesium nitrate List II A. KMnO4 B. Mg3N2 C. Mg(NO3)2 D. Al2(SO4)3 E. Na2ZnO2 F. N2O G. H2CO3 H. Al2S3 I. NO J. FeS K. Fe2S3 L. H3PO4 M. Cu2S N. CuS O. Fe2O3 P. FeO Q. FeSO4 R. Fe2(SO4)3 S. CuO T. Cu2O Underline the incorrectly balanced compound in each equation & rewrite the correct equation.
2Na + 3H2O ⟶ 2NaOH + H2
4P + 4O2 ⟶ 2P2O5
Fe2O3 + 2H2 ⟶ 2Fe + 3H2O
2Al + 2H2SO4 ⟶ Al2(SO4)3 + 3H2
N2 + 3H2 ⇌ NH3
ZnO + 3NaOH ⟶ Na2ZnO2 + H2O
FeCl3 + 3NH4OH ⟶ 2NH4Cl + Fe(OH)3
FeS + 2HCl ⟶ 2FeCl2 + H2S
3NH3 + H2SO4 ⟶ (NH4)2SO4
PbO2 + 4HCl ⟶ PbCl2 + H2O + Cl2