chemistry MCQs – Page 59

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
1161. Marsh gas is_______?
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A. Hydrogen

B. Nitrogen

C. Ethane

D. Methane
1162. The IUPAC name of ethylene oxide is__________?
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A. Epoxy methane

B. Oxoethene

C. Oxirane

D. Methoxymethane

1163. The absolute value of charge on electron was determined by ________ ?
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A. J.J.Thomson

B. Robert Millikan

C. Rutherford

D. Chadwick

1164. What is the molecular weight of Ammonia (NH3) ________ ?
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A. 18.031 g/mol

B. 17.031 g/mol

C. 19.031 g/mol

D. 27.033 g/mol

1165. Clemmensens reduction infolves the reduction of___________________?
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A. all of the above

B. alkane

C. aldehyde

D. ketone
1166. The law of traids is applicable to__________?
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A. Cl, Br, I

B. Li, Be, B

C. Na, K, Rb

D. F, Cl, Br

1167. The energy of one mole of photons of radiation, whose frequency is 410 14 Hz, is ___________?
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A. 159.6kJ

B. 80.4 KJ

C. 135.5 KJ

D. 110.5 KJ

1168. The best method of preparation of alkyl halides is a reaction of alcohol with__________________?
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A. PCI3

B. PCI5

C. Zn / HCI

D. SOCl2 / Pyridine
1169. Alkyl halides are considered to be very reactive compounds towards nucleophile because_________________?
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A. they have a nucleophilic carbon & a good leaving group

B. they have an electrophilic carbon & a bad leaving group

C. they have an electrophilic carbon & a good leaving group

D. they have an electrophilic carbon

1170. The most commonly used bleaching agent is_________?
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A. sodium chlorine

B. alcohol

C. carbon dioxide

D. chlorine
1171. The bond length of C=C is___________?
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A. 1.68A

B. 1.54A

C. 1.20A

D. 1.34A

1172. Which of the following is most soluble on water?
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A. CaSO4

B. SrSO4

C. BaSO4

D. MgSO4
1173. Which of the following is soluble in water?
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A. AgCl

B. AgBr

C. AgF

D. AgI

1174. The formula C6H5-CO-CH3 represents_______ ?
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A. Acetone

B. Phenyl acetate

C. Acetophenone

D. Acetic acid

1175. Which alcohol will undergo elimination reaction to give alkene in the presence of acidic potassium dichromate ?
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A. All of above

B. Secondary alcohol

C. Primary alcohol

D. Tertiary alcohol
1176. Beillstein test is used for________?
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A. Cl

B. CO2

C. CO

D. N2

1177. When an aldehyde is reacted with hydrogen cyanide a Cyanihydrin is formed. This process is best termed as __________?
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A. Necleophilic substitution

B. Electrophilic addition

C. Electrophilic substitution

D. Nucleophilic addition
1178. Which law states that the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature?
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A. Grahams Law

B. Avogadros Law

C. Boyles law

D. Charles Law
1179. 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?
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A. C2H4

B. C4H8

C. C5H10

D. C3H6

1180. Which of the following noble gases is abundant in air?
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A. Neon

B. Helium

C. Argon

D. Methane