FREE CHEMISTRY ONLINE TEST

CHEMISTRY ONLINE TEST 05

1 / 10

According to Arrhenius concept, an acid is:

A substance that gives H⁺ ions in solution

A substance that gives OH⁻ ions in solution

A substance that accepts a proton

A substance that donates a pair of electrons

2 / 10

Which of the following is a Lewis acid?

NH₃

H₂O

OH⁻

BF₃

3 / 10

In aqueous solution, which acid is stronger?

CH₃COOH

HCl

H₂CO₃

4 / 10

Which of the following pairs represents conjugate acid-base pair?

HCl / Cl⁻

NH₄⁺ / NH₃

H₂O / OH⁻

All of these

5 / 10

pH of 0.01 M HCl solution is:

6 / 10

The base dissociation constant (K_b) of NH₃ is 1.8 × 10⁻⁵. What is the pK_b value?

5.74

4.74

3.74

2.74

7 / 10

Which of the following solutions will have the highest pH?

0.1 M NaOH

0.1 M HCl

0.1 M CH₃COOH

0.1 M NH₄Cl

8 / 10

buffer solution can be prepared from:

Strong acid + strong base

Weak base + its salt with strong acid

Weak acid + its salt with strong base

Both (b) and (c)

9 / 10

The ionic product of water (K_w) at 25 °C is:

1 × 10⁻¹²

1 × 10⁻¹⁴

1 × 10⁻¹⁶

1 × 10⁻¹⁰

10 / 10

Which of the following indicators is suitable for strong acid–strong base titration?

Methyl orange

Phenolphthalein

Both (a) and (b)

None

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FREE CHEMISTRY ONLINE TEST – 05

Free chemistry online test 05 for JEE NEET EAPCET EXAMS

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