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1 : Empirical formula of 2-hexene (C₆H₁₂)?
A
:
C₂H₂
B
:
CH
C
:
C₆H₁₂
D
:
CH₂
2 : Moles in 25g of H₂SO₄?
A
:
0.765 moles
B
:
0.51 moles
C
:
0.255 moles
D
:
0.4 moles
3 : Which is the correct formula of calcium phosphide?
A
:
CaP
B
:
CaP₂
C
:
Ca₂P₃
D
:
Ca₃P₂
4 : How many atomic mass units (amu) are there in one gram?
A
:
1 amu
B
:
10²³ amu
C
:
6.022*10²³ amu
D
:
6.022*10²² amu
5 : Number of carbon atoms in 6g of diamond?
A
:
6.02*10²³
B
:
12.04*10²³
C
:
3.01*10²³
D
:
1.003*10²³
6 : How many atoms are present in one gram of H₂O?
A
:
1002*10²³ atoms
B
:
6.022*10²³ atoms
C
:
0.334*10²³ atoms
D
:
2.004*10²³ atoms
7 : Compound with highest % of nitrogen?
A
:
CO(NH₂)₂
B
:
N₂H₄
C
:
NH₃
D
:
NH₂OH
8 : Mass of 95% CaCO₃ to neutralize 50 cm³ 0.5M HCl?
A
:
9.5g
B
:
1.25g
C
:
1.32g
D
:
1.45g
9 : Mass of Al in 204g of Al₂O₃?
A
:
26g
B
:
27g
C
:
54g
D
:
108g
10 : Produces maximum CO₂?
A
:
Carbon
B
:
Diamond
C
:
Ethane (C₂H₆)
D
:
Methane (CH₄)
11 : Which of the following represents an empirical formula?
A
:
CH2ob
B
:
C2H2O2
C
:
H2O2
D
:
C6H12O2
12 : The empirical formula of a compound with a wit an empirical formula CH2oO and a molar mass 90 g/ mole?
A
:
CH2O
B
:
C6H6
C
:
C3H6O3
D
:
C2H4O2
13 : What is the chemical formula of water?
A
:
H2O2
B
:
H2O
C
:
Ho
D
:
H3O
14 : sodium chloride is represent by :
A
:
Na2
B
:
Na2Cl2
C
:
N2H4
D
:
NaCl
15 : What is the formula of chemical phosphate?
A
:
Ca3(PO4)2
B
:
CaPO4
C
:
Ca3P2
D
:
Ca4(PO4)3
16 : What is the simplest ratio of hydrogen to oxygen atoms in H2O2:
A
:
2:1
B
:
1;2
C
:
1;1
D
:
2;2
17 : The correct formula methane is:
A
:
CH4
B
:
C2H6
C
:
C3H8
D
:
CH3
18 : What is the chemical formula for ammonia?
A
:
NH2
B
:
NH3
C
:
N2H2
D
:
NH4+
19 : Avogadro number is :
A
:
6.022 × 10²³
B
:
1.602x10²
C
:
9.81m/s2
D
:
2.718
20 : How many moles are three in eight g of water (|H2O)
A
:
1 mole
B
:
0.44 mole
C
:
q2 mole
D
:
1.5 mole
21 : Which law is followed by a balanced chemical equation?
A
:
Law of conversation of momentum
B
:
Law of conversation of mass
C
:
Law of definite proposition
D
:
law of constant composition
22 : 1 mole of oxygen gas (o2) weight:
A
:
8g
B
:
32g
C
:
16g
D
:
64g
23 : How many atoms are present in 1 mole of hydrogen gas (H2)?
A
:
1.204x1024
B
:
6.022x1023
C
:
3.011x1023
D
:
1.204x1023
24 : How many oxygen atoms are in 1 mole of CO2?
A
:
1
B
:
2
C
:
6.022x1023
D
:
1.204x1024
25 : What is the limiting reaction if 10 g H2 react 100 g of O2?
A
:
H2
B
:
O2
C
:
H2o
D
:
none
26 : What is the molar gass of glucose?
A
:
180g mole
B
:
1280g mole
C
:
176g mole
D
:
120 g mole
27 : How many moles are in 36 g of HO?
A
:
1 mole
B
:
2 mole
C
:
3mole
D
:
4 mole
28 : the formula of benzene is :
A
:
C2H6
B
:
C6H6
C
:
CH4
D
:
C4H10
29 : Which gass law relate volume and molest at constant temperature and pressure?
A
:
Boyle Law
B
:
Charles Law
C
:
Avogadro law
D
:
Ideal Gass law
30 : Which compound has the highest molar mass?
A
:
H2O
B
:
CO2
C
:
H2So4
D
:
NH3
31 : What is the molar mass of NaCL?
A
:
35.5g/mole
B
:
58.5g/mole
C
:
23g/mole
D
:
80g/mole
32 : The molar mass of Co2 is:
A
:
12gmol
B
:
16g/mole
C
:
44g/mole
D
:
32g/mole
33 : What is the mass of two mole of NaOH?
A
:
40g
B
:
23g
C
:
18g
D
:
80g
34 : What is the product of NaOH+ HCL?
A
:
H2O+H2
B
:
NACL+H2
C
:
NACl+H2O
D
:
NaCl
35 : In the equation CH4+2O2+2H2O the coefficient of O2is:
A
:
1
B
:
3
C
:
4
D
:
2
36 : In the reaction N2+3H2____2NH3 what is the mole ratio of H2to NH3?
A
:
1;1
B
:
3;2
C
:
2;4
D
:
1;2
37 : How many moles of O2 are needed to react with 5 moles of CH4?
A
:
12 moles
B
:
5 moles
C
:
2.5 moles
D
:
10 moles
38 : Which of the following is a single displacement reaction?
A
:
Zn+CuSO4+Cu
B
:
H2+Cl2___2HCL
C
:
2H2O_________2H2+O2
D
:
NaCL
39 : In the reaction 2H2+O2_______2H2O how many moles of water are product from 4 moles of hydrogen?
A
:
1mole
B
:
2 moles
C
:
3 moles
D
:
8 moles
40 : The reaction is an example of :
A
:
Combination
B
:
Decomposition
C
:
Single displacement
D
:
Neutralization
41 : What is the percentage composition of oxygen in H2O?
A
:
50
B
:
33
C
:
88.89
D
:
16
42 : What is the volume of 0.5 moles of any gas at STP?
A
:
11.2
B
:
22.4L
C
:
11.2L
D
:
44.8L
Chemistry 9th MCQs || Ilam Ghar
Chapter 4 : Stoichiometry
Chemistry 9th
