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.

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

B

Q.2: Law of Multiple proportion was proposed by?

1. Ritcher
2. Lavoisier
3. Louise Proust
4. John Dalton

D

Q.3: Berzelius performed the experiments on the preparation of?

1. ZnS
2. PbS
3. FeS
4. H2S

B

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

D

Q.5: 2 moles of CaCO3 is equal to?

1. 160g
2. 200g
3. 88g
4. 100g

B

Q.6: 23 a.m.u. of Na is equal to?

1. 2 moles
2. 4 moles
3. 3 moles
4. 1 mole

D

Q.7: CaCO₃ CaO + CO₂ is an example of:?

1. decomposition reaction
2. combustion reaction
3. single displacement
4. addition reaction

A

Q.8: A reaction in which substances reacts with oxygen is?

1. combustion reaction
2. single displacement reaction
3. addition reaction
4. decomposition reaction

A

Q.9: Which type of reactions are neutralization and hydrolysis reaction?

1. single displacement
2. addition
3. decomposition
4. double displacement

D

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

B

Q.11: Symbol represents?

1. light
2. state of matter
3. heat
4. catalyst

C

Q.12: How many grams atoms arc therein 5 moles of carbons?

1. 24g
2. 36g
3. 60g
4. 12g

C

Q.13: N_A represents?

1. mole
2. mass number
3. atomic number
4. Avogadros Number

D

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

D

Q.15: Avogadros Number shows the number of?

1. electrons
2. particles
3. neutrons
4. protons

B

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

A

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

A

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

C

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

C

Q.20: Benzene has molecular formula C6H6. Its empirical formula will be?

1. C₁₈H₁₈
2. C₂H₂
3. C₁₂H₁₂
4. CH

D

Q.21: One mole of CO₂ contains CO₂?

1. 22g
2. 12g
3. 32g
4. 44g

D

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

B

Q.23: The mass of one mole of substance is called:?

1. Molecular mass
2. Formula mass
3. Molar mass
4. Atomic mass

C

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

C

Q.25: The symbol represents a?

1. No way reaction
2. Half way reaction
3. One way reaction
4. Two way reversible reaction

D