chemistry MCQs – Page 51

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 Review each marked answer and report any item that may be outdated or unclear.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
1001. Electric bulb filament is made of__________?
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A. Lead

B. Aluminum

C. Copper

D. Tungsten
1002. What is the order of kinetics in the SN1 mechanism ?
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A. Zero

B. Third

C. First

D. Second

1003. Electronic Configuration of Calcium (Ca) atom may be written as________?
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A. Kr,4p2

B. Ne, 4p2

C. Ne, 4s2

D. Ar, 4s2
1004. The chemical formula of sodium hypochlorite is________________?
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A. NaClO4

B. NaClO2

C. NaClO3

D. NaCLO
1005. The IUPAC name of HCONH2 is___________?
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A. Formanide

B. Methanamide

C. Aminoethanol

D. Methanoylamine

1006. The compound (CH3)3COH according to IUPAC is known as ___________?
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A. 2,2-Dimethyl-propanol

B. 1,1- Diethylethanol

C. Tert Alcohol

D. Tert-Butanol

1007. The discovery of neutron became very late because _______ ?
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A. It does not carry any charge

B. It is a fundamental particle

C. It is present in nucleus

D. It does not move

1008. The rate of E1 reaction depends upon______________________?
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A. the concentration of substrate

B. base the concentration of substrate as well as nucleophile

C. the concentration of substrate as well as nucleophile

D. the concentration of nucleophile

1009. Which law states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules?
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A. Avogadroslaw

B. Charles law

C. Boyles law

D. Gay-Lussacs law

1010. _____________ surfactants perform well over a wide range water hardness and PH?
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A. Cationic

B. Neutral

C. Anionic

D. Nonionic
1011. The molecules of which gas have highest speed?
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A. O<sub>2</sub>at 0<sup>o</sup>C

B. H2at -73oC

C. N<sub>2</sub>at 1,027<sup>o</sup>C

D. CH<sub>4</sub>at 300 K

1012. Upto ___________________ C atoms alkanes are gases?
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A. 3

B. 4

C. 2

D. 6

1013. 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?
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A. 74% Fe

B. 75% Fe

C. 78% Fe

D. 77% Fe

1014. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is___________?
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A. Henrys law

B. Daltons law

C. Gay Lussacs law

D. Raoults law

1015. The substance used in cancer therapy is___________?
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A. Ni

B. Fe

C. Rn

D. Co
1016. The anhydride of HCIO4 is_________________?
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A. Cl2O7

B. ClO2

C. Cl2O

D. Cl2O6

1017. A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?
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A. C6H12O6

B. C2H6O

C. C2H5O

D. C6H18O3
1018. Which law states that the rate of the effusion of a gas is inversely proportional to the square root of its density?
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A. Gay-Lussacs law

B. Grahams Law

C. None of these

D. Boyles law

1019. Which of the following is the weakest reducing agent ?
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A. HI

B. HC

C. HBr

D. HF
1020. In which compound of Xenon the oxidation state of Xenon is + 6?
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A. XeOF2

B. Na4XeO6

C. XeOF4

D. XeF4