CSCA Chemistry Official Sample (Free Online Test)

CSCA Chemistry Official Sample

20 Questions | 100 Points | Official physics sample here
25:00
Reference Atomic mass: O: 16 Na: 23 Cu: 64
Question 1 / 20
Which of the following substances, when added to water, may result in a solution with a pH of 4?
Question 2 / 20
What is the correct method used for preparing the following gases in the laboratory?
Question 3 / 20
It is known that the solubility of KNO3 increases with temperature. Which of the following methods can make a saturated solution of KNO3 become an unsaturated solution?
Question 4 / 20
What is the mass fraction of solute in the solution obtained by adding 90 grams of 10% KCl solution and completely dissolving 10 grams of KCl?
Question 5 / 20
Which of the following are homologues of C2H4?
Question 6 / 20
Using CO to react with copper oxide, 6.4 grams of copper were obtained, and the volume of gas generated under standard conditions is:
Question 7 / 20
Which of the following groups consists of allotropes of the same element?
Question 8 / 20
There are x electrons outside the nucleus of Y2-, with a relative atomic mass of m, so the number of neutrons in the nucleus of element A is:
Question 9 / 20
At room temperature, the pH of a 100mL 0.05mol·L-1 H2SO4 solution is:
Question 10 / 20
For the endothermic reaction C(s) + H2O(g) ⇌ CO(g) + H2(g), what can cause the equilibrium to shift in the opposite direction?
Question 11 / 20
6.9g of metallic sodium is fully burned in air, and the combustion product is added to sufficient water. The mass of the gas released after the reaction is:
Question 12 / 20
Which of the following reactions belongs to addition reactions?
Question 13 / 20
Which of the following statements is correct?
Question 14 / 20
In a colorless and transparent acidic solution, which of the following ions can coexist in large quantities?
Question 15 / 20
Which of the following operations is wrong?
Question 16 / 20
Using the device shown in the figure, which of the following dry gases can be produced? (a and b represent the added reagents)
Question 17 / 20
When performing crude salt purification in the laboratory, it is necessary to remove Ca2+, Mg2+, and SO42-. The reagents used and the order of addition are:
Question 18 / 20
If a copper wire is inserted into hot concentrated sulfuric acid for the exploration experiment shown in the figure (a-d are cotton soaked in the corresponding test solution), which of the following analyses is correct?
Question 19 / 20
Using zinc chloride solution as electrolyte and crude zinc waste containing Cu as electrode for electrolysis, high-purity zinc is obtained. What is correct in this process?
Question 20 / 20
W, X, Y, and Z are four short period main group elements, with increasing atomic numbers in sequence. XY is a colorless gas that can react with Y2 at room temperature to obtain brown gas XY2. Z atom has the largest atomic radius in the same period, and the reaction of Z's elemental with W2Y yields gas W2. Which of the following statements is incorrect?

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