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chemistry MCQs

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 Review each marked answer and report any item that may be outdated or unclear.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

1. What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?
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A. Glass

B. Paint

C. Cement

D. Gun Powder

2. Which of following metals can be displaced by all other metals from its solution ?
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A. Cu

B. Ag

C. Au

D. A

3. Purines and pyrimidines are_________________?
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A. Enzymes

B. Carbohydrates

C. Nitrogenous bases

D. Lipids

4. Isomerism which is present only in alkene is__________________?
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A. structural isomerism

B. metamerism

C. cis-trans isomerism

D. both b and c

5. Stronger is the oxidizing agent greater is the___________________?
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A. Oxidation potential

B. e.m.f of cell

C. standard reduction potential

D. Redox potential

6. A safe and more reliable method for drying the crystal is__________________?
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A. Vacuum desiccator

B. folds of filter paper

C. oven

D. Hot air currents

7. Which of the elements do not fall in stair case of the modern periodic table__________________?
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A. Si

B. None of the above

C. As

D. Te

8. The hardest of the following solids is__________________?
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A. graphite

B. diamond

C. magnesium

D. sodium

9. Which of the following solution has the highest boiling point ?
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A. All have same boiling point

B. 18.0 % glucose solution

C. 6.0 % urea solution

D. 5.85% NaCl Solution

10. The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?
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A. aqueous NaOH

B. Fehling solution

C. aqueous bromine

D. alkaline aquenous iodine

11. The properties of an element mosly corresponds to that isotope which has greater_________________?
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A. all of the above

B. Mass number

C. Atomic mass

D. Relative abundance

12. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
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A. lighter

B. are collected at same time

C. heavier

D. intermediate

13. Which of the following are isoelectronic species ?
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A. C1- Br- I

B. Li+ Na+ K+

C. F- Ne Na+

D. H+ H H-

14. The radioactive isotope of hydrogen is called___________?
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A. protium

B. deuterium

C. tritium

D. ortho-hydrogen

15. Chemical properties of first member of homologous series with respect to other members are_________________?
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A. same

B. depends upon number of C atoms

C. different

D. depends upon number of H atoms

16. Electron was discovered by?
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A. Yuri Gagarin

B. James Maxwell

C. Michael Faraday

D. J.J Thomson

17. In which of the following type of reactions energy of reactant is greater than energy of product________________?
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A. endothermic

B. unpredictable

C. same

D. exothermic

18. Which of the following is an amide________________?
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A. R-NH2

B. C6H5NH2

C. RCONH2

D. R NH R

19. When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?
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A. a hydroxy group makes the benzene ring more susceptible to electrophilic attack

B. 2-bromophenol is insoluble in water

C. phenol is unsaturated

D. acid-base reaction

20. Which one of the following looks odd__________________?
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A. KMnO4

B. H2SO4

C. H2S

D. K2CrO4

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