Some Basic Concepts In Chemistry Mock Tests

38 questions available

Some Basic Concepts In Chemistry Mock Test 1

Questions: 30

Some Basic Concepts In Chemistry Mock Test 2

Questions: 8

Sample Questions

NEET Chemistry

Which of the following statements about the law of multiple proportions is correct?

A It applies when two elements combine to form more than one compound

B It applies when a compound decomposes into its constituent elements

C It applies to physical mixtures of two or more elements

D It states that all elements have definite proportions

JEE Main Chemistry

Moles of electrons transferred per mole of Al2O3 formed from elements:

A 2

B 3

C 4

D 6

JEE Main Chemistry

Which of the following species has the highest electron gain enthalpy?

A Cl

B F

C Br

D I

JEE Main Chemistry

Calculate the mass of sodium hydroxide (NaOH) required to prepare 250 mL of 0.5 M NaOH solution. (Na = 23, O = 16, H = 1)

A 5.0 g

B 10.0 g

C 2.5 g

D 7.5 g

NEET Chemistry

2.8 g of iron reacts with 2.4 g of sulfur to form FeS. What is the limiting reagent? (Fe = 56 g/mol, S = 32 g/mol)

A Iron

B Sulfur

C Both are limiting reagents

D Neither — they are in stoichiometric ratio

NEET Chemistry

The number of significant figures in 0.002503 is:

A 3

B 4

C 5

D 7

NEET Chemistry

A compound contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. Its molecular mass is 90 g/mol. What is its molecular formula? (C = 12, H = 1, O = 16)

A C₄H₈O₄

B C₂H₄O₂

C C₃H₆O₃

D C₅H₁₀O₅

NEET Chemistry

The percentage of nitrogen in urea (NH₂CONH₂, molar mass = 60 g mol⁻¹) is approximately:

A 28%

B 46.67%

C 21%

D 60%

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