Chemistry group 33

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Chemistry multiple choice questions and answers 1.what is oxidation? A) the addition of hydrogen to a substance and the removal of oxygen from a substance B) the loss of electrons by a species , accompanied by an increase in oxidation number C) the reduction of oxidation state of the oxidizing agent D) the addition of electrons to the oxidizing agent ✅ Answer B 2.detergents are better than soaps because they A) are naturally available B) are biodegradable C) can be used in hard water D) none ✅ Answer C 3.All of the following properties of an element increase across a period. EXCEPT; A) Electron affinity B) Atomic size C) Electronegativity D) Ionization energy ✅ Answer B 4.Which of the following represents a tentative explanation of a certain scientific law? A) Hypothesis B) Observation C) Experimentation D) Theory ✅ Answer A 5.what is the maximum number of unpaired electrons in a d subshell? A) 7 B) 8 C) 5 D) 4 ✅ Answer C 6. If we increase the concentration of a reactant , what happens to the collisions between particles? A) There are the same number of collisions, but they have less energy. B) There are the same number of collisions, but they have more energy. C) There are the same number of collisions. D) There are more collisions ✅ Answer D 7.Which one of the following combinations CANNOT produce a buffer solution? A.HClO4 and NaClO4 B. HNO2 and NaNO2 C. HCN and NaCN D. NH3 and (NH4)2SO4 ✅ Answer A 8.What is a titrant? It is a A) solution of unknown concentration B) diluted solution C) solution of known concentration D) weak solution ✅ Answer C 9.Reducing agent is a substance that is A) reduced B) oxidized C) unaffected D) reduced in oxidation number ✅ Answer B 10. Which one of the following is TRUE about the relative strength of a base? A) Ionization of a base increases with its strength. B) Ionization of a base decreases with its strength. C) Weak bases dissociate completely in water. D) Strong bases dissociate partially in water ✅ Answer A IDEA FOR ALL STUDENTS

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10 important Biology MCQ and answers 1.Which of the following has active role in the process of translation during protein synthesis? A. mRNA B. tRNA C. rRNA D. Ribosomal protein 2. What is the type of mutation that arises from a change in the nucleotide sequence of DNA molecule at particular locus of the chromosome? A. Gene mutation B. Numerical mutation C. Structural mutation D. Chromosomal mutation 3. What is the best term used to refer to all the gene present in a population? A. Biochemistry B. Gene pool C.Genome D. DNA 4. Assume that E (gene for brown Eye) is dominant over e (gene for blue eye) and that the father and the mother have both genes in their sex cells, what would be the proportion of homozygous children for eye color? A. 100% homozygous B. 90% homozygous C. 75% homozygous D. 50% homozygous 5. If the sequence of base on a DNA strand is AAGGTT, which is the corresponding base sequence on messenger RNA? A. TTCCAA B. UUCCAA C. AACCUU D. AAGGTT 6, regarding the ABO blood group inheritance, in which of the following mating a child of the blood type O is produced? A. AAxOO B. BBxOO C. AOxAB D. AOxBO 7, Which of the following chromosomes mutation involves loss of chromosome segment? A. Aneuploidy B. Translocation C. Duplication D. Deletion 8. Which of the following species is used to transfer recombinant DNA to plant? A. Ecoli B. Agrobacterium tumerfaciens C. Nitrogen fixing bacteria D. Denitrifying bacteria 9. Which of the following cells is diploid? A. Egg B. Sperm C. Sperm and egg D. Zygote 10. At which stage of cell division do homologous chromosomes line up at the equatorial plane of the cell? A. Prophase B. Metaphase C. Anaphase D. Telophase Answers 1. B 2. A 3. B 4. D 5. B 6. D 7. D 8. B 9. D 10. B

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