Chemistry Quiz - Grade 9

Completely dissolve 19.2 grams of the mixture X consisting of Fe, FeO, Fe2O3, and Fe3O4 in 400 ml of 3M HNO3 (excess), heat, and obtain solution Y and V liters of NO gas (the only reduction product, at stp). Pour 350 ml of 2M NaOH solution into solution Y, after complete reactions, obtain 21.4 grams of precipitate. What is the value of V?

• 3.36

• 5.04

• 5.60

• 4.48

Given the conversion diagram: F( )EFE F YXZY. Which compounds E, F correspond to the diagram?

• H2O, CO2

• CO2, H2O

• CO2, Na2CO3

• H2O, NaOH

The mixture X of C2H4 and H2 has a specific gravity of 3.75 compared to He. When X is placed in a flask with Ni catalyst, heated, after a period of reaction, a mixture Y with a specific gravity of 6.00 compared to He is obtained. The reaction efficiency of C2H4 is

Crush 1 gram of CH3COONa along with 2 grams of lime alkali (CaO and NaOH) and place it in a test tube. Heat the test tube evenly, then concentrate the part containing the reaction mixture. The hydrocarbon produced in the above experiment is

• methane

• ethane

• ethylene

• acetylene

The open-chain hydrocarbon X with the molecular formula C4Hn, knowing that X does not form a precipitate when reacting with AgNO3 solution in NH3. The number of suitable structural formulas for X is

(a)  

Hydrocarbon X with the molecular formula C4Hn does not form a precipitate when reacting with AgNO3 in NH3. How many suitable structural formulas for X are there?

• 7

• 9

• 11

• 8

A mixture X contains CH4, C2H2, C2H6, and C2H4 with a specific gravity of 12.55 compared to H2. When a mol of X is completely burned and the products are reacted with excess Ca(OH)2 solution, 35g of white precipitate is obtained and the mass of the container increases by 22.78g. On the other hand, when 1.004g of X reacts with excess Br2 solution, the maximum amount of Br2 reacted is x mol. What is the value of x?

• 0.016

• 0.028

• 0.014

• 0.030

Consider the following hydrocarbons: acetylene, methane, ethylene, vinylacetylene (CH2=CH-C≡CH). Which of the following statements about the given hydrocarbons is correct?

Which of the following elements in the ground state has 3 electrons in the outermost shell?

• Na

• C

• Al

• N

Dissolve 7.52g of a mixture X containing M2CO3 and MHCO3 in HCl solution. All the CO2 gas evolved is absorbed by a minimal amount of a solution containing 0.06 mol NaOH (ignoring the solubility of CO2 in water). When X reacts with excess BaCl2 solution, the mass of the precipitate obtained is?

• 11.82g

• 39.40g

• 59.10g

• 7.88g