Science Practice Quiz 30

Q1.Based on Activity 3.11, what is the decreasing order of reactivity of magnesium, aluminium, zinc, and iron with dilute acids?

A. Fe > Zn > Al > Mg B. Mg > Al > Zn > Fe C. Al > Mg > Fe > Zn D. Zn > Fe > Mg > Al

Q2.Which metal showed the fastest rate of bubble formation and the most exothermic reaction when tested with dilute hydrochloric acid in Activity 3.11?

A. Aluminium B. Zinc C. Iron D. Magnesium

Q3.What observation was made regarding copper's reaction with dilute HCl in Activity 3.11?

A. Vigorous bubbling and high temperature increase B. Slow bubbling and slight temperature increase C. No bubbles and temperature remained unchanged D. Rapid bubbling and temperature decrease

Q4.What is the ratio of concentrated hydrochloric acid to concentrated nitric acid in aqua regia?

A. 1:3 B. 2:1 C. 3:1 D. 1:2

Q5.Which noble metals can be dissolved by aqua regia, even though neither of its constituent acids can do so alone?

A. Silver B. Copper C. Gold and Platinum D. Aluminium

Q6.How is aqua regia described in terms of its physical and chemical properties?

A. Mildly corrosive, non-fuming liquid B. Highly corrosive, fuming liquid C. Non-corrosive, odourless liquid D. Slightly acidic, clear liquid

Q7.Why is sodium metal typically stored immersed in kerosene oil?

A. To prevent it from reacting with atmospheric oxygen and moisture. B. To make it easier to cut into smaller pieces. C. To increase its electrical conductivity. D. To enhance its metallic luster.

Q8.What is the charge of a chlorine atom after it gains an electron?

A. A unit positive charge B. A unit negative charge C. No charge D. A double negative charge

Q9.How does sodium chloride (NaCl) primarily exist?

A. As individual molecules B. As aggregates of oppositely charged ions C. As a covalent compound D. As a metallic lattice

Q10.What is the electronic configuration of a Sodium (Na) atom according to the provided information?

A. 2, 8 B. 2, 8, 1 C. 2, 8, 8 D. 2, 8, 8, 1

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Science Practice Quiz 30