Chemistry

The set of elements that differ in mutual relationship from those of the other sets is:

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A diagonal relationship is observed in the periodic table between elements of period (2) and period (3).

Li and Mg

Be and Al

B and Si

Li and Na do not show a diagonal relationship.

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The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

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When we add cryolite (Na? AlF? ) in the extraction of aluminium, the melting point of alumina decreases

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Chemistry Equilibrium

For the coagulation of a negative sol, the species below, that has the highest flocculating power is:

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For the coagulation of a negative sol, the species Ba²? has the highest flocculating power (referring to the Hardy-Schulze rule, where higher charge leads to greater coagulation power).

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Compound with molecular formula C?H?O can show:

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Functional group isomers

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Chemistry Structure of Atom

A certain orbital has no angular nodes and two radial nodes. The orbital is:

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Quantum Numbers and Orbitals:

o Total Node = n - 1 (l => Azimuthal Q.N)

o Radial Node = n - l - 1

o Angular Node: l

o If Angular node = 0, then l = 0, i.e., S orbital.

o If Radial nodes = 2, then n - l - 1 = 2.

o Substituting l = 0 gives n - 0 - 1 = 2, so n = 3.

o Therefore, the orbital is 3s.

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Fructose is an example of:

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Match List – I with List – II
List – I List – II
(a) Haematite (i) Al2O3.xH2O
(b) Bauxite (ii) Fe2O3
(c) Magnetite (iii) CuCO3.Cu(OH)2
(d) Malachite (iv) Fe3O4
Choose the correct answer from the opt

...more

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Haematite: Fe? O?

Bauxite: Al? O? ·xH? O

Magnetite: Fe? O?

Malachite: CuCO? ·Cu (OH)?

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The common positive oxidation states for an element with atomic number 24, are:

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The electron configuration for Cr (24) is [Ar] 4s¹3d?

Chromium shows common oxidation states from +2 to +6.

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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: During the boiling of water having temporary hardness, Mg(HCO?)? is converted to MgCO?.
Reason R: The solubility product of Mg(OH)? is greater than that of MgCO?. In the light of the above statements, choose the most appropriate answer from the options given below:

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Match List - I with List - II:
List - I
(a) Ca(OCl)?
(b) CaSO?.½H?O
(c) CaO
(d) CaCO?

List - II
(i) Antacid
(ii) Cement
(iii) Bleach
(iv) Plaster of Paris

Choose the most appropriate answer from the options given below:

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