SSC CGL Chemistry Questions and Answers – Page 6

addition of HX to alkene H attaches to carbon bearing more hydrogen atoms. Option B (“X adds to carbon with more H atoms”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“H and X add randomly”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Both H and X add to same carbon”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Identify the governing formula, definition or reaction and apply it consistently. The answer field, correct index and explanation therefore all identify H adds to carbon with more H atoms. Markovnikov's rule: In addition of HX to alkene H attaches to carbon bearing more hydrogen atoms.

Option A (“Methyl carbocation”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“Primary carbocation”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“Secondary carbocation”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Tertiary carbocation. Tertiary carbocations are most stable due to maximum hyperconjugation and inductive effect from three alkyl groups.

mines the shape of orbital. Option A (“Principal quantum number n”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“Magnetic quantum number m”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Spin quantum number s”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Azimuthal quantum number l. Azimuthal quantum number l determines the shape of orbital.

So lambda is proportional to 1/sqrt(V). Option D (“sqrt(V)”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify 1/sqrt(V).de Broglie wavelength: lambda = h/mv = h/sqrt(2meV).

For n=2 Z=1: r = 0.529 x 4 = 2.116 angstrom. Option A (“0.529 A”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“1.058 A”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“4.763 A”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Bohr radius rn = 0.529 x n^2 / Z angstrom.

e with electrode potential assigned as 0.00 V. Standard Hydrogen Electrode (SHE) is the reference electrode with electrode potential assigned as 0.00 V.

The answer field, correct index and explanation therefore all identify E = E0 - RT/nF ln Q. Nernst equation: E = E0 - (RT/nF) ln Q.

As temperature increases KH increases so gas solubility decreases. Option A (“Solubility of gas increases”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“No change in solubility”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Gas escapes from solution”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Solubility of gas decreases. Henry's law: p = KH x. Higher KH means lower solubility.

Coordination number is 6. In NaCl crystal each Na+ is surrounded by 6 Cl- ions and each Cl- by 6 Na+ ions.

shorter wavelength blue light scatters more than red light. Option A (“Snell's Law”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“Faraday's Law”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Henry's Law”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Rayleigh Scattering. Blue sky is due to Rayleigh scattering where shorter wavelength blue light scatters more than red light.