MCQ 121: With an increasing atomic number of Halogens, the A. Van der Waals forces decrease B. atomic radii increases C. color becomes lighter D. reactivity increases

Q: Which of the following compounds is likely to have the lowest melting point? NaCl CS2 Pb…

A: Melting point: The temperature at which a solid substance melts to achieve liquid state. Melting…

Q: 20. How many domains are there around the central atom in H2O? A. 1 B. 2 C. 4 D. 3

A: To tell the number of domains around the central atom.

Q: 12. (3) How does a nucleus for a semi-crystalline polymer form crystalline nuclei, and how do they…

A: “Since there are multiple questions and it is not mentioned that which one has to be solved so I am…

Q: 27. in dehydration synthesis reactions, where do the atoms that make up a molecule of water come…

A: 27. in dehydration synthesis reactions, where do the atoms that make up a molecule of water come…

Q: Why does structure formation in nature rely occur on the nanoscale? Select one:

A: The properties of the matter can be observed based on the size of the particles. The physical…

Q: 4.32 (a) Calculate the enthalpy of formation of the hypothetical compound KF, assuming a CaF,…

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Q: Differentiate between ionic bonding and van der Waals bonding.

A: Differentiate between ionic bonding and vander Waals bonding.

Q: Determine the theoretical density for Ti element, which is HCP structure, atomic mass 47.867 g/mol,…

A: For HCP structure of titanium, Ti, the relationship between radius and edge length is - a = 2R Here,…

Q: What is graphene? Why is graphene unique?

A: Graphene is an allotrope of carbon. The carbon atoms in the graphene structure are present in a…

Q: MCQ 42: Oxidation of hydrogen halides become casier going A. across the periods (left to right) B.…

A: Oxidation in simple word loss of electron. Hydrogen halides are - HF HCl HBr HI As we go down in…

Q: MCQ 15: in Group IV, the highest melting point is of A. Carbon(Diamond) B. Tin (Sn) C. Lead (Pb) D.…

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Q: Carbon has an atomic radius of 77 pm and a first ionization energy of 1086 kJ/mole. 23. Based on…

A: Introduction :  Ionisation energy : Ionization energy is simple terms can be described as a measure…

Q: dentify all the types of van der Waals intera a) PCI3 (p.c.) dispersion

A: 1) PCl3 is polar compound  Dispersion and dipole  2) in CF2Br2 Dispersion and dipole

Q: Define the van der Waals Model ?

A: Sjsj

Q: The four fundamental forces are arranged in the increasing order of their relative strength. (A, B…

A: Both gravity and electromagnetism have infinite range and the strength of these forces die off as…

Q: What happens to h, the height of the mercury column, if theatmospheric pressure increases?

A: Barometer is an instrument used to measure the atmospheric pressure. Barometer usually consists of a…

Q: The distance between the centers of the Lit and F ions is 143 pm. Determine the energy of…

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Q: Copper has FCC crystalline structure. The di b0oy and atomic weight are given 8.93 g/cm 3 and 63.54…

A: Copper has FCC crystalline structure. Then the total number of atoms, Z=4 Density=8.92 g/cm3  Atomic…

Q: Explain van der Waals radius in detail .

A: A van der Waals radius is a measure for the size of an atom that is not chemically i.e. ionically…

Q: 18. How do you determine the molecular shape of the portion of the molecule where carbon, whose…

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Q: What mass, in g, of Na3PO4 would be needed to lower the melting point of 3.4 kg of ice to -4.83 ˚C?…

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Q: What is the energy change when the temperature of 10.7 grams of solid chromium is decreased from…

A: Solution:- Given data => mass of solid Chromium = 10.7 g Initial temperature = 37.2 0C  Final…

Q: Q2: (Material lattice) choose the correct answer: no FCC ВсС НСР lattice availabl Heart tissue Piece…

A: FCC is ‘Face centered cubic lattice’ (coordination number 6), BCC is ‘Body centered cubic lattice’…

Q: Which of the following is NOT possible?       3f   4d   5p   2p   2s

A: According to quantum mechanics, there are four types of quantum numbers. The electrons are filled in…

Q: Using principles of chemical bonding and/or intermolecular forces, explain each of the following.…

A: since you are posted multiple questions, we are entitled to answer first question with first three…

Q: Which nonmetals, besides hydrogen, are most often involved in hydrogen bonding? Select all that…

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Q: 1) Pick the one with the largest radius. Explain your selection using chemical principles a. Ca2+ or…

A: The distance between the center of nucleus and outermost shell of electron is known as atomic radius…

Q: Is iodine monochloride in solid form conductive with respect to electrical conductivity? Why or why…

A: Iodine monochloride is a Black solid. Iodine monochloride is polar in nature due to…

Q: QI: Prove that the components in NaCl structure is identical to the two of inert gases? (Z of Na=…

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Q: For each matchup below state which one has the higher melting/boiling point and state why. H20 vs…

A: The boiling point of any compound is the temperature at which the vapor pressure of the compound…

Q: MCQ 100: Down the group, the melting points of Halogens A. increase B. decrease C. remain steady D.…

A: The question is based on periodic properties of the elements. we have to explain the variation of…

Q: If PF3 is covalent, state its structure using the VSEPR model, and if the molecule is polar or…

A: PF3 is a covalent compound which is formed by sharing of electrons between the phosphorus and…

Q: Is NO2-1 polar, non polar, or ionic?

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Q: Which of the following has the smallest radius? Cl- S2- Ca2+ K+ Ar

A: Answer:- This question is answered by using the simple concept size of isoelectronic species which…

Q: Dr. Mohsin AI-Y 18. Spherical and ellipsoidal carbon nanomaterials are referred to as: (a)…

A:

Q: Properties "X" Melting Point (°C) 800 BO 1200 Soluble in water yes no no no по Yes Solid state…

A: Metal are good electrons donors and also they have high melting point and conducts electricity in…

Q: Thermodynamics and enthalpy Data: M(Pb) = 207 g mol AmeltH°(Pb) = 4.8 kJ-mol AvapH°(Pb) = 179.5…

A: Molar enthalpy of reaction can be calculated from the steps involved in the reaction.

Q: PFill in t he [H30+ J Blanlc Spaces- Seoraw Eell worlc [OHJ ア4 ACIP, Bate Neut.

A:

Q: Q6 /A B/Ifa pure Silicon crystal has 2.5 million free electrons inside it. How many holes does it…

A: An intrinsic semiconductor is a pure type of semiconductor .silicon is pure semiconductor. Here no…

Q: What is the energy change when the temperature of 10.1 grams of solid silicon is decreased from 36.2…

A: The energy change of any solid is given by, => Q = mCΔT where m = mass of solid = 10.1 g C =…

Q: What is the origin of the attraction between atoms in a Van Der Waals material? Coulomb repulsion…

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Q: The four (4) methods of bonding between the atoms are: - Ionic, Covalent, Metallic, and Van der…

A: The ionic bond is an electrostatic attraction force, formed between the ions and it is a strong…

Q: Which of the following compounds has the highest boiling point? Не Li Be B. Ne 14 17 Na Mg Al Si ci…

A: Answer:- This question is answered by using the simple concept of boiling point which depends on the…

Q: What is the mole ratio between H2 and O2? A)1:2 B)2:1 C)2:2 D)4:2

A: Answer - The correct option is (B)  2:1 Mole ratio - A mole ratio is a conversion factor that…

Q: Are allotropes different from polymorphs with respect to Carbon? Give reason for your answer.

A: Polymorphism is similarly defined as isomerism, it means if structure of an ionic compound exist in…