JEE Exam > JEE Notes > 35 Years Chapter wise Previous Year Solved Papers for JEE > Integer Answer Type Questions: Some Basic Concepts of Chemistry | JEE Advanced
Integer Answer Type Questions: Some Basic Concepts of Chemistry | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE PDF Download
Q. 1. A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL, and 25.0 mL. The number of significant figures in the average titre value is (2010)
Ans. Sol. The least significant figure in titre values is 3.
Average titre value = 
= 25.1
The number of significant figures in average titre value will also be 3.
Q. 2. Silver (atomic weight = 108 g mol–1) has a density of 10.5 g cm–3. The number of silver atoms on a surface of area 10–12 m2 can be expressed in scientific notation as y × 10x. The value of x is : (2010)
Ans. Sol. d = 
⇒ 10.5 g/cc means in 1 cc ⇒ 10.5 g of Ag is present.
Number of atoms of Ag in 1 cc ⇒ 1
In 1 cm, number of atoms of Ag = 
In 1 cm2, number of atoms of Ag = 
In 10–12 m2 or 10–8 cm2, number of atoms of Ag
= 1. 5 × 107
Hence x = 7
Q. 3. The difference in the oxidation numbers of the two types of sulphur atoms in Na2S4O6 is (2011)
Ans. Sol.
Difference in oxidation number = 5 – 0 = 5
Q. 4. If the value of Avogadro number is 6.023 × 1023 mol–1 and the value of Boltzmann constant is 1.380 × 10–23 J K–1, then the number of significant digits in the calculated value of the universal gas constant is (JEE Adv. 2014)
Ans. Sol. R = NA × k = 6.023 × 1023 × 1.380 × 10–23
= 8.312 which has 4 significant figures
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FAQs on Integer Answer Type Questions: Some Basic Concepts of Chemistry - JEE Advanced - 35 Years Chapter wise Previous Year Solved Papers for JEE
| 1. What are some basic concepts of chemistry? |  |
Ans. Some basic concepts of chemistry include elements, compounds, and mixtures, as well as concepts like atomic structure, chemical bonding, stoichiometry, and the periodic table. These concepts form the foundation of understanding the behavior and properties of matter.
| 2. What is the importance of understanding basic chemistry concepts for JEE Advanced exam? | |
Ans. Understanding basic chemistry concepts is crucial for the JEE Advanced exam as it forms a significant portion of the syllabus. Questions based on these concepts are frequently asked in the exam. A strong understanding of these concepts helps in solving complex problems and scoring well in the chemistry section.
| 3. What is stoichiometry in chemistry? | |
Ans. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions. It involves calculations based on balanced chemical equations to determine the amount of reactants consumed or products formed, as well as other related properties such as molar ratios and percent composition.
| 4. How does atomic structure relate to chemistry? | |
Ans. Atomic structure is a fundamental concept in chemistry as it provides information about the arrangement and behavior of atoms, which are the building blocks of matter. The number and arrangement of protons, neutrons, and electrons in an atom determine its properties and chemical behavior. Understanding atomic structure helps in predicting the reactivity, bonding, and physical properties of elements and compounds.
| 5. What is the periodic table and why is it important in chemistry? | |
Ans. The periodic table is a tabular arrangement of chemical elements based on their atomic number, electron configuration, and recurring chemical properties. It provides a systematic representation of all known elements, categorizing them into groups and periods. The periodic table is important in chemistry as it helps in understanding the trends in atomic properties, chemical reactivity, and the arrangement of elements in various chemical families. It serves as a valuable tool for predicting the behavior of elements and their compounds.
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