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Chemistry questions and answers

Browse questions about Chemistry, with answers and explanations.

423 questions

Acids, Bases and Salts54 questionsChemical Bonding10 questionsChemical Kinetics4 questionsChemical Reactions2 questionsChemical Reactions and Equations16 questionsChemistry in Everyday Life24 questionsCombustion and Flame12 questionsCoordination Compounds2 questionsElectrochemistry5 questionsEnvironmental Chemistry7 questionsMetallurgy13 questionsMetals and Non-metals3 questionsMetals, Non-metals and Alloys22 questionsOrganic Chemistry94 questionsPeriodic Table58 questionsPolymers3 questionsSolutions15 questionsSome Basic Concepts of Chemistry7 questionsStates of Matter22 questionsStructure of Atom48 questionsSurface Chemistry2 questions

Questions

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Assertion (A): Silicon dioxide has a high melting point due to strong covalent bonds throughout its structure. Reason (R): Silicon dioxide is made up…

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At 25°C and approximately one atmosphere, consider the following statements. 1. Mercury has a boiling point of approximately 357°C. 2. Gallium is liquid. 3.…

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Assertion (A): Potassium reacts violently with cold water, producing hydrogen gas and heat. Reason (R): Potassium is an alkali metal with low reactivity.

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Which of the following statements about metals and non-metals is incorrect?

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Which of the following statements is NOT correct regarding the alkali metals?

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Assertion (A): Aqua regia can dissolve noble metals like gold and platinum. Reason (R): Chloroform is a strong acid that reacts with metals to…

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Which of the following statements is/are NOT correct? I. The property of metals by which they can be beaten into thin sheets is called…

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Assertion (A): Emissions of sulfur dioxide and nitrogen oxides can contribute to acid rain. Reason (R): These gases react with atmospheric water, oxygen and…

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Assertion (A): Mercury is always present in an amalgam. Reason (R): Amalgams are alloys of mercury with one or more other metals.

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Which of the following is a non - metal that can exist in different form?

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Consider the following statements: 1. Electrum is a naturally occurring alloy of gold and silver. 2. Constantan is an alloy of copper and nickel.…

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Which group 17 element has stable isotopes with mass numbers 35 and 37 and representative abundances of approximately 75.77% and 24.23% respectively?

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From which Latin word is the S block element calcium derived?

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Consider the following statements: 1. The dash-wedge formula is used to represent the three-dimensional structures of molecules on a two-dimensional surface. 2. In the…

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Which is the most specific description of the atomicity of a white-phosphorus molecule (P₄)?

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Which electrostatic theory treats ligands as charges or dipoles and explains geometry-dependent splitting of the metal d-orbital energies in coordination complexes?

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Which of the following pairs of 'elements - valency' is correct? I. Boron - 2 II. Fluorine - 3

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Which of the following statements is NOT correct regarding Rutherford's nuclear model of an atom?

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For a sample of a monatomic element, which expression gives the number of atoms in terms of the sample mass, molar mass and Avogadro…

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Which of the following pairs of 'number - composition' is correct? I. Atomic number - number of protons II. Mass number - Sum of…

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Consider the following statements: 1. Ernest Rutherford used gold foil approximately 1000 atoms thick for his alpha scattering experiment. 2. The experiment showed that…

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