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NEET Questions / Chemistry / Some Basic Concepts in Chemistry
A compound has an empirical formula of CH and a molecular mass of 78 g/mol. What is its molecular formula?
C2H2
C4H4
C6H6
C8H8
A compound containing only carbon and hydrogen has an empirical formula of CH2. If its molar mass is approximately 56 g/mol, what is its molecular formula?
C2H4
C3H6
C4H8
C5H10
Which of the following pairs has the same empirical formula?
C2H6 and C4H12
CH3OH and CH3CH2OH
H2O and H2O2
N2O3 and NO
A compound has the empirical formula C2H4O. If its molecular mass is 88 g/mol, what is its molecular formula?
C2H4O
C3H6O1.5
C4H8O2
C4H8O
What volume of oxygen at STP is required to completely burn 3.2 g of methane?
2.24 L
4.48 L
8.96 L
1.12 L
10 g of calcium carbonate () on heating produces how many grams of calcium oxide ()? (Atomic masses: Ca = 40, C = 12, O = 16)
5.6 g
10 g
11.2 g
4.4 g
How many moles of are produced when 2 moles of propane () are completely combusted in excess oxygen?
2 moles
3 moles
6 moles
8 moles
What is the limiting reagent when 2 moles of react with 1 mole of to form water?
H₂
O₂
Neither H₂ nor O₂ is the limiting reagent.
Both H₂ and O₂ are limiting reagents.
If 4 g of NaOH is dissolved in 250 mL of water, what is the molarity of the solution?
0.1 M
0.2 M
0.4 M
0.8 M
20g of hydrogen gas reacts with 40g of oxygen to produce water. Which is the limiting reagent and how much water is formed(in grams)?
Hydrogen is the limiting reagent, and 180g of water is formed.
Oxygen is the limiting reagent, and 45g of water is formed.
Hydrogen is the limiting reagent, and 90g of water is formed.
Oxygen is the limiting reagent, and 36g of water is formed.
