SSC CGL Chemistry Questions and Answers – Page 9

= Ca(40) + C(12) + 3O(16) = 40+12+48 = 100 g/mol. Option A (“80 g/mol”) 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 (“120 g/mol”) 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 (“60 g/mol”) 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 100 g/mol. Molar mass CaCO3 = Ca(40) + C(12) + 3O(16) = 40+12+48 = 100 g/mol.

h C is sp3 hybridized and forms 4 covalent bonds. Option A (“Ionic”) 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 (“Metallic”) 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 (“Hydrogen”) 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 Covalent. Diamond has covalent network. Each C is sp3 hybridized and forms 4 covalent bonds.

The answer field, correct index and explanation therefore all identify Na Al Mg Si. Correct: Na Al Mg Si.

ure of solute not number of particles so not colligative. Option A (“Osmotic pressure”) 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 (“Boiling point elevation”) 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 (“Freezing point depression”) 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 Optical rotation. Optical rotation depends on nature of solute not number of particles so not colligative.

sigma+2pi) + C-H(sigma) = 3 sigma + 2 pi total bonds. Option A (“2 sigma 1 pi”) 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 (“2 sigma 2 pi”) 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 sigma 1 pi”) 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 3 sigma 2 pi. H-C(sigma) + C triple bond C (1sigma+2pi) + C-H(sigma) = 3 sigma + 2 pi total bonds.

zes excess stomach acid and is used as antacid. Option A (“NaCl”) 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 (“Na2SO4”) 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 (“NaNO3”) 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 NaHCO3. NaHCO3 sodium bicarbonate neutralizes excess stomach acid and is used as antacid.

Option A (“Tetrahedral”) 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 (“See-saw”) 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 (“Octahedral”) 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 Square planar. XeF4 with sp3d2 hybridization and 2 lone pairs takes square planar molecular shape.

Option A (“NO2”) 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 (“N2O”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Cu with dilute HNO3 gives NO gas: 3Cu + 8HNO3 gives 3Cu(NO3)2 + 2NO + 4H2O.

tate and in SO3 has +6. Option A (“H2SO4 to SO2”) 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 (“S to H2S”) 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 (“S to SO2”) 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 SO2 to SO3. S in SO2 has +4 oxidation state and in SO3 has +6.

er catalyzes N2+3H2=2NH3 in Haber process at 450C and 200 atm. Option A (“Platinum”) 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 (“Vanadium pentoxide”) 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 (“Nickel”) 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 Iron with Mo promoter. Iron with molybdenum promoter catalyzes N2+3H2=2NH3 in Haber process at 450C and 200 atm.