Chemistry

Salts that contain water of crystallization are said to be?

A. anhydrous B. deliquescent C. efflorescent D. hydrated Correct Answer: Option D D. hydrated

6 years ago

Consider the reaction represented by the following equation: H2(g) + ½O(g) → H2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of?

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

6 years ago

In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called?

A. atmospheric pressure B. partial pressure C. total pressure D. vapour pressure Correct Answer: Option B B. partial pressure

6 years ago

Which of the following expressions correctly represents Charles’ law?

A. PV = K B. Rn = PV C. PV = RT D. V = KT Correct Answer: Option D…

6 years ago

What is the value of -14°C on the Kelvin temperature scale?

A. 259K B. 287 K C. 287oK D. 259oK Correct Answer: Option A A. 259K

6 years ago

What is the percentage by weight of calcium in Ca(OCI)2? [Ca = 40, Cl = 35.5, O = 16]

A. 28.0% B. 31.6% C. 43.8% D. 44.5% Correct Answer: Option A A. 28.0%

6 years ago

How many molecules are there in 14 g of nitrogen at s.t.p.? [N = 14, Avogadro’s constant = 6.02 x 10^23 mol-1]

A. 6.02 x 10^23 B. 3.01 x 10^23 C. 8.43 x 10^24 D. 1.20 x 10^24 Correct Answer: Option A…

6 years ago

The number of particles in one mole of a chemical compound is the?

A. atomic number B. Avogadro's number C. mass number D. oxidation number Correct Answer: Option B B. Avogadro's number

6 years ago

Which of the following molecules is not linear in shape?

A. CO2 B. O2 C. NH3 D. HCI Correct Answer: Option C C. NH3

6 years ago

In bonded atoms, increase in electronegativity difference?

A. increases polarity B. decreases polarity C. has no effect on polarity D. brings the polarity to zero Correct Answer:…

6 years ago