Chemistry

Which of the following conditions will most enhance the spontaneity of a reaction?

A. ΔH is negative and greater than TΔS B. ΔH is negative and ΔS = 0 C. ΔH is positive…

5 years ago

200cm³ of 0.50mol/dm³ solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is?

A. 10g B. 25g C. 20g D. 15g Correct Answer: Option A - 10g Explanation Equation: Ca(HCO3)2 → CaCO3 (precipitate)…

5 years ago

Which of the following sets of operation will completely separate a mixture of sodium chloride, sand and iodine?

A. addition of water, filtration, evaporation to dryness and sublimation B. filtration, evaporation to dryness, addition of water and sublimation…

5 years ago

Methane is prepared in the laboratory by heating a mixture of sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are?

A. Ca(OH)2 and NaOH B. Na2CO3 C. NaCl D. NaOH Correct Answer: Option A - Ca(OH)2 and NaOH Explanation Soda-lime…

5 years ago

Hydrogen bond is a sort of?

A. van der waals force B. dative bond C. ionic bond D. a covalent bond Correct Answer: Option D -…

5 years ago

The oxidation state(s) of nitrogen in ammonium nitrite is/are?

A. -3, +3 B. +5 C. -3, +5 D. -3 Correct Answer: Option A = -3, +3 Explanation Ammonium nitrite…

5 years ago

The hybridization in the compound CH3−CH2−C≡H is?

A. sp³ and sp B. sp C. sp² D. sp³ and sp² Correct Answer: Option A Explanation The hybridization in…

5 years ago

The electronic configuration of element Z is 1s² 2s² 2p6 3s² 3p¹. What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.

A. Z3(SO4)2 B. ZSO4 C. Z2SO4 D. Z2(SO4)3 Correct Answer: Option D - Z2(SO4)3 Explanation Z = 1s² 2s² 2p6…

5 years ago

Which quantum divides shells into orbitals?

A. Spin B. Principal C. Azimuthal D. Magnetic Correct Answer: Option C - Azimuthal Explanation The azimuthal quantum number determines…

5 years ago

The shapes of water, ammonia, carbon (iv) oxide and methane are respectively?

A. linear, tetrahedral, angular and pyramidal B. angular, pyramidal, linear and tetrahedral C. pyramidal, linear, tetrahedral and angular D. tetrahedral,…

5 years ago
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