9th Chemistry Unit 2 Chemical Combinations MCQs Sindh Board

9th Grade Chemistry Chapter 2 Chemical Combinations Sindh Board MCQs Notes Online Chapter Wise Question Answers. Sindh Boards Chemistry Subject Notes For Exams Preparations Karachi, Jamshoro, Sindh Boards. Chemistry class Ninth sindh board notes Unit 2 Chemical Combinations Most Repeated Multiple Choice Questions With Answers. Chemistry notes for class IX sindh board karachi Boards.

Ninth Sindh Board MCQs Notes
9th Chemistry Sindh Board MCQs

Q.1: Mass can neither be created nor destroyed during a chemical reaction, is the law of?
  1. reciprocal proportion
  2. conservation of mass
  3. constant composition
  4. multiple proportion
Q.2: Law of Multiple proportion was proposed by?
  1. Ritcher
  2. Lavoisier
  3. Louise Proust
  4. John Dalton
Q.3: Berzelius performed the experiments on the preparation of?
  1. ZnS
  2. PbS
  3. FeS
  4. H2S
Q.4: A combination of symbols of atoms or ions, that are held together chemically in a compound is called?
  1. simplest formula
  2. molecular formula
  3. empirical formula
  4. formula
Q.5: 2 moles of CaCO3 is equal to?
  1. 160g
  2. 200g
  3. 88g
  4. 100g
Q.6: 23 a.m.u. of Na is equal to?
  1. 2 moles
  2. 4 moles
  3. 3 moles
  4. 1 mole
Q.7: CaCO3 CaO + CO2 is an example of:?
  1. decomposition reaction
  2. combustion reaction
  3. single displacement
  4. addition reaction
Q.8: A reaction in which substances reacts with oxygen is?
  1. combustion reaction
  2. single displacement reaction
  3. addition reaction
  4. decomposition reaction
Q.9: Which type of reactions are neutralization and hydrolysis reaction?
  1. single displacement
  2. addition
  3. decomposition
  4. double displacement
Q.10: The number in front of the formula in a chemical equation is called?
  1. subscript
  2. Co efficient
  3. expression
  4. none of these
Q.11: Symbol represents?
  1. light
  2. state of matter
  3. heat
  4. catalyst
Q.12: How many grams atoms arc therein 5 moles of carbons?
  1. 24g
  2. 36g
  3. 60g
  4. 12g
Q.13: NA represents?
  1. mole
  2. mass number
  3. atomic number
  4. Avogadros Number
Q.14: A reaction in which two or more substances react to form a single substance is called?
  1. combustion reaction
  2. displacement reaction
  3. decomposition reaction
  4. addition reaction
Q.15: Avogadros Number shows the number of?
  1. electrons
  2. particles
  3. neutrons
  4. protons
Q.16: The formulas for all atoms in an empirical formula of a compound is?
  1. Empirical formulas
  2. Structural formulas
  3. Chemical formulas
  4. Molecular formulas
Q.17: In 1961, the standard for atomic masses was designated by the isotope of:?
  1. C\-12
  2. C-13
  3. H-1
  4. C-14
Q.18: One mole of any substance contains?
  1. Unequal number of particles
  2. Equal number of particles
  3. Avogadro numbers of particles
  4. Dalton numbers of particles
Q.19: Avogadro number is constant. Its value is:?
  1. 3.02 x 1021
  2. 3.02 x 1022
  3. 3.02 x 1023
  4. 3.02 x 1024
Q.20: Benzene has molecular formula C6H6. Its empirical formula will be?
  1. C18H18
  2. C2H2
  3. C12H12
  4. CH
Q.21: One mole of CO2 contains CO2?
  1. 22g
  2. 12g
  3. 32g
  4. 44g
Q.22: In water, the ratio between the masses of hydrogen and oxygen is:?
  1. 1:2
  2. 1:8
  3. 2:1
  4. 2:16
Q.23: The mass of one mole of substance is called:?
  1. Molecular mass
  2. Formula mass
  3. Molar mass
  4. Atomic mass
Q.24: In a chemical equation, reactants are written on the left hand side and products are written on the:?
  1. Left
  2. Middle
  3. Right
  4. Upper
Q.25: The symbol represents a?
  1. No way reaction
  2. Half way reaction
  3. One way reaction
  4. Two way reversible reaction
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