Chemistry Mcqs

The relatively high energy of the gauche conformation of butane is primarily associated with_________?

(A) Angle strain
(B) Torsional strain
(C) Steric strain
(D) Orbital strain

Submitted By :Ali Uppal

The most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds would be__________?

(A) Distillation
(B) Extraction
(C) Gas chromatography
(D) Column chromatography

Submitted By :Ali Uppal

The molecular formula for cholesterol is C27 H46 O. What are the degrees of unsaturation for this compound?

(A) 5
(B) 6
(C) 7
(D) 8

Submitted By :Ali Uppal

The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in__________?

(A) 1.8 gram of H2O
(B) 12 moles of KMnO4
(C) 0.6N H2SO4
(D) 4.6 gram of C2H5OH

Submitted By :Ali Uppal

A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

(A) C2H4
(B) C3H6
(C) C4H8
(D) C5H10

Submitted By :Ali Uppal

A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

(A) C2H6O
(B) C6H18O3
(C) C6H12O6
(D) C2H5O

Submitted By :Ali Uppal

A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

(A) 74% Fe
(B) 75% Fe
(C) 77% Fe
(D) 78% Fe

Submitted By :Ali Uppal

What is the mass percent of silver in silver notrate, AgNO3?

(A) 64.5%
(B) 65.6%
(C) 63.5%
(D) 61.5%

Submitted By :Ali Uppal

How many moles are in 22.2 grams of Calcium chloride, CaCl2?

(A) 0.2 moles
(B) 0.3 moles
(C) 0.4 moles
(D) 0.5 moles

Submitted By :Ali Uppal

Tetraethyl lead is used as______?

(A) Pain Killer
(B) Fire Extinguisher
(C) Mosquito Repellent
(D) Petrol Additive

Submitted By :Ali Uppal

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