Inorganic Chemistry MCQs with Explanations

We're talking about oxides, which are compounds of elements with oxygen. Group III and IV are talking about specific columns of the periodic table. What does "basic" and "acidic" mean? * Basic oxides react with acids. They often form metal oxides. Think of them as the opposite of acids. * Acidic oxides react with bases. They often form non-metal oxides. * Neutral oxides don't readily react with acids or bases. Group III and IV Oxides: The properties of oxides often change as you move across the periodic table. Think about that these groups contains metals, non metals and metalloids, so there is variety of elements present. Generally: * Group III oxides tend to be more on the basic side, but their properties can vary. Boron oxide (B₂O₃), for instance, is weakly acidic. * Group IV oxides show a wider range. Silicon dioxide (SiO₂), which is found in sand, is weakly acidic. Carbon dioxide (CO₂) is acidic. However, some oxides like lead oxide can show both acidic and basic (amphoteric) properties. So, what's the usual behavior? Because Group III oxides can be basic (although there are exceptions) and Group IV oxides can be acidic (though again, there are exceptions and amphoteric nature), the best overall answer is that they can be both basic and acidic .

Carbon is the correct answer to “The chemical composition of diamond is”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Only 2 is the correct answer to “Consider the following statements with reference to the periodic table of chemical elements. 1. Ionization potential gradually decreases along a period. 2. In a group of elements, electron affinity decreases as the atomic weight increases. 3. In a given period, electronegativity decreases as the atomic number increases. Which of these statement(s) is/are correct”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

100 is the correct answer to “Approximately, how many different chemical elements exist in the Earth”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Silicon is the correct answer to “Which is the most abundant element after oxygen”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Hydrogen is the correct answer to “Which of the following is the most common element in the Universe”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

(A) is false, but (R) is true is the correct answer to “Assertion(A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason(R): In a group, the atomic radii generally increase from top to bottom.”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Oxygen is the correct answer to “The element found maximum in the soil layer is”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Diamond is the correct answer to “Which of the following is a fundamental element”. This question is standard in competitive examination syllabi for Inorganic Chemistry.

Oxygen is the correct answer to “Which one of the following is present in the largest amount in terms of percent by mass in the Earth's crust”. This question is standard in competitive examination syllabi for Inorganic Chemistry.