Chemistry

Which of the following gases are arranged in increasing order of diffusion rate? [H = 1 .0; C = 12; N = 14; O = 16; S = 32]

A. SO2, O2, NH3, H2 B. H2S, NH3, O2, SO2 C. CO2, N2O, O2, SO2 D. NH3, NO2, N2, CO2…

6 years ago

The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]

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

6 years ago

The gas law which describes the relationship between volume and temperature is?

A. Boyle's law B. Charles' law C. Dalton's law D. Graham's law Correct Answer: Option B B. Charles' law

6 years ago

Which of the following phenomena lead to decrease in volume of a liquid in an open container?

A. Brownian motion B. Diffusion C. Evaporation D. Sublimation Correct Answer: Option C C. Evaporation

6 years ago

The pressure exerted by a gas is a function of the?

A. total volume of the gas B. speed of the gaseous molecules C. mass of each gaseous molecule D. frequency…

6 years ago

Which of the following statements about nuclear reaction is correct? The reaction?

A. involves neutrons only B. takes place inside the nucleus C. is governed by temperature and pressure D. involves protons…

6 years ago

Noble gas molecules are held together by?

A. van der Waals forces B. hydrogen bonds C. dative bonds D. covalent bonds Correct Answer: Option A A. van…

6 years ago

Which of the following elements is diatomic?

A. Sodium B. Oxygen C. Iron D. Neon Correct Answer: Option B B. Oxygen

6 years ago

The volume of 0.25 moldm-³ solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00)

A. 464.30 cm³ B. 625.00 cm³ C. 1000.00 cm³ D. 2153.80 cm³ Correct Answer: Option A A. 464.30 cm³

6 years ago