Chemistry

The property of calcium chloride which makes it useful as a drying agent is that it is?

A. ionic B. deliquescent C. a strong electrolyte D. a normal salt Correct Answer: Option B - deliquescent

5 years ago

Which of the following compounds dissolves in water to form a solution with pH below 7?

A. Sodium tetraoxosulphate (VI) B. Potassium hydroxide C. Ammonium chloride D. Sodium trioxocarbonate (IV) Correct Answer: Option C - Ammonium…

5 years ago

Which of the following is an acid salt?

A. NH4CI B. MgSO4.7H2O C. CH3COONa D. NaHCO3 Correct Answer: Option D - NaHCO3

5 years ago

An exothermic reaction is one which involves?

A. attainment of dynamic equilibrium B. loss of heat to the surrounding C. evolution of gas as it proceeds D.…

5 years ago

Calculate the total volume of the gaseous mixture at the end of the reaction?

30cm³ pf hydrogen at s.t.p combine with 20cm³ of oxygen to form steam according to the following equation 2H2(g) +…

5 years ago

Helium is preferred to hydrogen in filling balloons because hydrogen?

A. is inflammable B. is diatomic C. exhibits isotopy D. is a component of water Correct Answer: Option A -…

5 years ago

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation?

Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm³ at s.t.p] A.…

5 years ago

Gas molecules are said to be perfectly elastic because?

A. they collide without loss of energy B. they move about in straight lines C. the distances between them are…

5 years ago

Equal volumes of CO2 and CO at s.t.p have the same?

A. mass B. density C. rate of diffusion D. number of molecules Correct Answer: Option D - number of molecules

5 years ago