1. Sieving is a technique used to separate mixtures containing solid particles of___.
A. small sizes
B. large sizes
C. different sizes
D. the same sizes
2. Which of the following compounds is composed of Al, Si, 0 and H?
A. Epsom salt
B. Limestone
C. Clay
D. Urea
3. Calculate the molarity of a solution containing 7.0g of potassium chloride in 1dm3 (K = 39. Cl = 35.5)
A. 0.011M KCl
B. 0.045M KCl
C. 0.094M KCI
D. 0.055M KCI
4. In the titration of oxalic acid against sodium hydroxide, the best indicator will be ___.
A. methyl orange
B. phenolthalein
C. phenolphthalein
D. litmus
5. Hydrogen bomb is based on the principle of ___.
A. nuclear fission
B. natural radioactivity
C. nuclear fusion
D. artificial radioactivity
6. The IUPAC name of coordination compound K3[Fe(CN)6] is
A. potassium hexalyanoferrate II
B. potassium hexalyanoferate III
C. potassium hexalyanoiron II
D. tripotassium hexalyaniron II
7. The nucleus of an atom consists of ___.
A. electrons and neutrons
B. electrons and protons
C. proton and neutrons
D. All of the above
8. The law which states that the amount a gas dissolved in a liquid is proportional to its partial pressure is ___.
A. Dalton’s Law
B. Gay Lussac’s Law
C. Henry’s Law
D. Raoultis Law
9. Below is a paper chromatogram of a mixture of dyes:
Which dye is least absorbed by the paper?
A. A
B. C
C. D
D. B
10. A hydrocarbon contains 20 by mass of hydrogen. What is its empirical formula?
A. CH2
B. CH3
C. C2H6
D. CH
11. Which of the following is NOT true for sigma (σ) bond?
A. It is stronger than pi (a) bond
B. It is weaker than pi (n) bond
C. It is formed as a result of head-to-head overlap of two atomic orbitals at 180˚
D. It results in the formation of single bond
12. What is the hybridization of the carbon atoms marked with asterisk?
A. SP3 and SP2
B. SP2 and SP3
C. SP3 and SP3
D. SP and SP2
13. Which of the following is an aromatic compound?
A. Cyclohexane
B. Cyclobutane
C. Benzene
D. Methanol
14. One of the main points of Dalton’s Atomic Theory can be stated as follows:
A. Atoms of the same elements can combine to form bridged mixture of compounds
B. Atoms of different elements can combine to form compound of polymers
C. Atoms of different elements can be combined to form complex ratios to each other
D. Atoms of different elements combine to form a compound, the number of atoms combined hearing a simple while number ratio to each other
15. Which of the following is true?
A. Standard enthalpy change of combustion is the enthalpy change when two moles a substance is completely ashed in nitrogen
B. Standard enthalpy change of combustion is the enthalpy change when one mole of the substance. is burnt completely in oxygen under standard conditions
C. Standard enthalpy change of combustion is the enthalpy change when one mole of oxygen and methane are liquefied in Nitrogen under standard conditions
D. Standard enthalpy change of combustion is enthalpy change when one mole of oxygen reacts endothermically with other substances under standard conditions
16. An increase in concentration of reactants will increase the reaction rate. This can be explained by:
A. the plumber of effective collisions between the reactant particles
B. the number of effective nuclear screening effect between the reactant particles
C. the number of effective mean free path of the compound in the system
D. the number of crowded substances in the gaseous form
17. Consider the reaction
N204(g) ↔ 2NO2(g)
colourless dark brown
Which one of the following correctly describes what you would see if the pressure was decreased?
A. The gas mixture would become lighter
B. The gases would condense to liquids
C. The gas mixture would become dark brown
D. The gases would separate into two layers
18. The electronic configuration of the atom is ____.
A. 2, 8, 3
B. 1s2 2s2 2p6 3s2 3p1
C. 1s2 2s2 2p6 3s1
D. 2, 8, 2
19. Which one of the following is not true about chlorine water?
A. It can displace fluorine from a fluoride
B. It is used as a disinfectant
C. It can bleach litmus paper
D. It can displace bromine from a bromide
20. What is the oxidation number of chromium in Potassium Chromate (K2CrO4)
A. +4
B. +6
C. +8
D. -4
You can check question 21 – 40 here
