Which one of the following statements is true?

• A) Most of solids have low densities
• B) most gases are ionic compounds
• C) solids, like liquids and gases, do not have fixed shapes and fixed volumes
• D) gases do not have their own shape but rather expand to fill the shapes of their containers uniformly

A sample of orange juice is found to have a pH of 3.80. What is he concentration of the hydroxide ion in the juice?

• A. 1.6 x 10^-4
• B. 6.3 x 10^-11
• C. 6.3 x 10^-4
• D. 1.6 x 10^-11

The IUPAC names for the compounds CH₃COOH and CH₂=CH₂ are respectively

• A) acetic acid and ethane
• B) ethanoic acid and ethene
• C) methanoic acid and ethylene
• D) acetic acid and ethene

Hydrogen is used for the following except

• A. manufacturing of ammonia
• B. synthesis of hydrochloric acid
• C. extinguishing fire
• D. conversion of coal to petrol

The determination of heat of combustion is carried out with

• A. a thermometer
• B. a bomb calorimeter
• C. an evaporating dish
• D. a boiling tube

How many electron are present in Be²⁺?

• A. 2
• B. 4
• C. 5
• D. 6

The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is

• A. dissolution → dryness → filtration → evaporation
• B. filtration → sublimation → evaporation → dryness
• C. sublimation → dissolution → filtration → evaporation
• D. dissolution → filtration → sublimation → evaporation

Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is

• A. 2:2
• B. 2:1
• C. 1:2
• D. 1:1

Why are \(H_2SO_4\) and \(CaCl_2\), not suitable for drying ammonia gas? They

• A. are poisonous.
• B. pollute the gas
• C. are corrosive
• D. react with the gas

Which of the following is a general method of preparing acids?

• A. Direct combination of constituent elements
• B. Reaction between a base and an amphoteric oxide
• C. Double decomposition involving a salt solution
• D. Reaction between an anhydride and water