Chemistry

The oxidation number of iodine in the iodate ion (IO‾³) is?

A. -5 B. -1 C. +1 D. +5 Correct Answer: Option D D. +5 Explanation IO‾³ [oxidation number of 1]…

6 years ago

Electrolysis is applied in the following processes except?

A. electroplating B. extraction of aluminium C. extraction of iron D. purification of copper Correct Answer: Option C C. extraction…

6 years ago

Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?

A. FeCI3 B. MgSO4.7H2O C. Na2SO4 D. KCI Correct Answer: Option A B. MgSO4.7H2O

6 years ago

The indicator used in neutralizing CH3COOH and NaOH solution has pH range of?

A. 3-5 B. 7-8 C. 8-10³ D. 10-12 Correct Answer: Option C C. 8-10³

6 years ago

Which of the following aqueous methods cannot be used to distinguish between a strong acid and a weak acid?

A. Conductivity measurement B. Measurement of pH C. Measurement of heat of neutralization D. Action on starch iodide paper Correct…

6 years ago

Which of the following processes is an endothermic reaction?

A. Dissolving NH4CI crystals in water B. Addition of concentrated H2SO4 C. Dissolving NaOH pellets in water D. Passing SO3…

6 years ago

Considered the reaction: H+(aq) + OH‾ (aq) → H2O(l). The energy change taking place in the reaction above is enthalpy of?

A. formation B. hydration C. neutralization D. solution Correct Answer: Option C C. neutralization

6 years ago

If 20 cm³ of distilled water is added to 80cm³ of 0. 50 mol dm‾³ hydrochloric acid, the new concentration of the acid will be?

A. 0.10mol dm‾³ B. 0.20mol dm‾³ C. 0.40mol dm‾³ D. 2.00mol dm‾³ Correct Answer: Option D D. 2.00mol dm‾³

6 years ago

If 1 mole of sodium contains 6 x 10²³ atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]

A. 1.56 x 10²³ B. 1.56 x 10²² C. 3.6 x 10²³ D. 3.6 x 10²² Correct Answer: Option B…

6 years ago