Chemistry

Which of the following substances decomposes when an electric current is passed through it?

A. Glucose solution B. Zinc rod C. Hydrochloric acid D. Tetrachlormethane Correct Answer: Option C C. Hydrochloric acid

6 years ago

What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

A. Oxygen B. Hydrogen C. Nitrogen D. Copper Correct Answer: Option D D. Copper

6 years ago

What is the oxidation number of nitrogen in AI(NO3)3?

A. + 1 B. + 3 C. + 5 D. + 6 Correct Answer: Option C C. + 5

6 years ago

A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?

A. The reaction goes to completion at equilibrium B. The forward reaction is exothermic C. At equilibrium increase in temperature…

6 years ago

Consider the following equation: Ag+ (aq) + CI‾aq) → Agv+vCI‾ (s) ; ∆H = -65.7 kJmol-1. From the equation, it can be deduced that

A. direct combination is involved and the reaction is endothermic B. a solid is formed and heat is evolved C.…

6 years ago

What does ∆H represent in the following equation? Cl(g) + e‾ → CI‾ (g); ∆H = – 363 kJ mol-1

A. ionization energy B. Electron affinity C. Dissociation energy D. Heat of atomization Correct Answer: Option B B. Electron affinity

6 years ago

It can be concluded that gastric juice?

A. contains enzymes B. is acidic C. is a mixture D. has pH value of 7 Correct Answer: Option B…

6 years ago

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by?

A. evaporation B. sublimation C. distillation D. filtration Correct Answer: Option D D. filtration

6 years ago

In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?

A. CaO + 2HNO3 → Ca(NO3)2 + H2O B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 C. S…

6 years ago