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mcqs of ,

1 : Empirical formula of 2-hexene (C₆H₁₂)?

1 : C₂H₂

2 : CH

3 : C₆H₁₂

4 : CH₂

2 : Moles in 25g of H₂SO₄?

1 : 0.765 moles

2 : 0.51 moles

3 : 0.255 moles

4 : 0.4 moles

3 : Which is the correct formula of calcium phosphide?

1 : CaP

2 : CaP₂

3 : Ca₂P₃

4 : Ca₃P₂

4 : How many atomic mass units (amu) are there in one gram?

1 : 1 amu

2 : 10²³ amu

3 : 6.022*10²³ amu

4 : 6.022*10²² amu

5 : Number of carbon atoms in 6g of diamond?

1 : 6.02*10²³

2 : 12.04*10²³

3 : 3.01*10²³

4 : 1.003*10²³

6 : How many atoms are present in one gram of H₂O?

1 : 1002*10²³ atoms

2 : 6.022*10²³ atoms

3 : 0.334*10²³ atoms

4 : 2.004*10²³ atoms

7 : Compound with highest % of nitrogen?

1 : CO(NH₂)₂

2 : N₂H₄

3 : NH₃

4 : NH₂OH

8 : Mass of 95% CaCO₃ to neutralize 50 cm³ 0.5M HCl?

1 : 9.5g

2 : 1.25g

3 : 1.32g

4 : 1.45g

9 : Mass of Al in 204g of Al₂O₃?

1 : 26g

2 : 27g

3 : 54g

4 : 108g

10 : Produces maximum CO₂?

1 : Carbon

2 : Diamond

3 : Ethane (C₂H₆)

4 : Methane (CH₄)

11 : Which of the following represents an empirical formula?

1 : CH2ob

2 : C2H2O2

3 : H2O2

4 : C6H12O2

12 : The empirical formula of a compound with a wit an empirical formula CH2oO and a molar mass 90 g/ mole?

1 : CH2O

2 : C6H6

3 : C3H6O3

4 : C2H4O2

13 : What is the chemical formula of water?

1 : H2O2

2 : H2O

3 : Ho

4 : H3O

14 : sodium chloride is represent by :

1 : Na2

2 : Na2Cl2

3 : N2H4

4 : NaCl

15 : What is the formula of chemical phosphate?

1 : Ca3(PO4)2

2 : CaPO4

3 : Ca3P2

4 : Ca4(PO4)3

16 : What is the simplest ratio of hydrogen to oxygen atoms in H2O2:

1 : 2:1

2 : 1;2

3 : 1;1

4 : 2;2

17 : The correct formula methane is:

1 : CH4

2 : C2H6

3 : C3H8

4 : CH3

18 : What is the chemical formula for ammonia?

1 : NH2

2 : NH3

3 : N2H2

4 : NH4+

19 : Avogadro number is :

1 : 6.022 × 10²³

2 : 1.602x10²

3 : 9.81m/s2

4 : 2.718

20 : How many moles are three in eight g of water (|H2O)

1 : 1 mole

2 : 0.44 mole

3 : q2 mole

4 : 1.5 mole

21 : Which law is followed by a balanced chemical equation?

1 : Law of conversation of momentum

2 : Law of conversation of mass

3 : Law of definite proposition

4 : law of constant composition

22 : 1 mole of oxygen gas (o2) weight:

1 : 8g

2 : 32g

3 : 16g

4 : 64g

23 : How many atoms are present in 1 mole of hydrogen gas (H2)?

1 : 1.204x1024

2 : 6.022x1023

3 : 3.011x1023

4 : 1.204x1023

24 : How many oxygen atoms are in 1 mole of CO2?

1 : 1

2 : 2

3 : 6.022x1023

4 : 1.204x1024

25 : What is the limiting reaction if 10 g H2 react 100 g of O2?

1 : H2

2 : O2

3 : H2o

4 : none

26 : What is the molar gass of glucose?

1 : 180g mole

2 : 1280g mole

3 : 176g mole

4 : 120 g mole

27 : How many moles are in 36 g of HO?

1 : 1 mole

2 : 2 mole

3 : 3mole

4 : 4 mole

28 : the formula of benzene is :

1 : C2H6

2 : C6H6

3 : CH4

4 : C4H10

29 : Which gass law relate volume and molest at constant temperature and pressure?

1 : Boyle Law

2 : Charles Law

3 : Avogadro law

4 : Ideal Gass law

30 : Which compound has the highest molar mass?

1 : H2O

2 : CO2

3 : H2So4

4 : NH3

31 : What is the molar mass of NaCL?

1 : 35.5g/mole

2 : 58.5g/mole

3 : 23g/mole

4 : 80g/mole

32 : The molar mass of Co2 is:

1 : 12gmol

2 : 16g/mole

3 : 44g/mole

4 : 32g/mole

33 : What is the mass of two mole of NaOH?

1 : 40g

2 : 23g

3 : 18g

4 : 80g

34 : What is the product of NaOH+ HCL?

1 : H2O+H2

2 : NACL+H2

3 : NACl+H2O

4 : NaCl

35 : In the equation CH4+2O2+2H2O the coefficient of O2is:

1 : 1

2 : 3

3 : 4

4 : 2

36 : In the reaction N2+3H2____2NH3 what is the mole ratio of H2to NH3?

1 : 1;1

2 : 3;2

3 : 2;4

4 : 1;2

37 : How many moles of O2 are needed to react with 5 moles of CH4?

1 : 12 moles

2 : 5 moles

3 : 2.5 moles

4 : 10 moles

38 : Which of the following is a single displacement reaction?

1 : Zn+CuSO4+Cu

2 : H2+Cl2___2HCL

3 : 2H2O_________2H2+O2

4 : NaCL

39 : In the reaction 2H2+O2_______2H2O how many moles of water are product from 4 moles of hydrogen?

1 : 1mole

2 : 2 moles

3 : 3 moles

4 : 8 moles

40 : The reaction is an example of :

1 : Combination

2 : Decomposition

3 : Single displacement

4 : Neutralization

41 : What is the percentage composition of oxygen in H2O?

1 : 50

2 : 33

3 : 88.89

4 : 16

42 : What is the volume of 0.5 moles of any gas at STP?

1 : 11.2

2 : 22.4L

3 : 11.2L

4 : 44.8L

Chemistry 9th MCQs || Ilam Ghar