chemistry MCQS
 

AOA , dear brothers if any one have chemistry MCQS plz share ,all the chemistry aspirants would take advantage and will give a lot of prayers for ur success ,
regards

[B]MCQs of chemistry paper 1 2010[/B]

Q.1. Select the best option/answer and fill in the appropriate box on the Answer Sheet (20)

(i) When an electron is brought from infinite distance close to the nucleus of the atom, the energy of Electron-nucleus system?
(a) increases to a smaller negative value
[B](b) decreases to a greater negative value[/B]
(c) decreases to a smaller positive value
(d) increases to a greater positive value

(ii) The probability of finding the electron in the nucleus is:
(a) 100% due to forces of attraction
(b) finite for all orbitals
[B](c) Zero for all orbitals[/B]
(d) Zero for some orbitals and finite for others

(iii) When Zn metal is kept in CuSO4 solution, copper is precipitated and ZnSO4 is formed because:
(a) Atomic number of Zinc is smaller than copper
(b) Atomic number of Zinc is larger than copper
(c) Standard reduction potential of Zinc is more than that of copper
[B](d) Standard reduction potential of Zinc is less than that of copper[/B]

(iv) Electrolytes when dissolved in water, dissociate into their constituent ions, the degree of dissociation of an electrolyte increases with the:
(a) Presence of a substance yielding common ion
(b) Decreasing temperature
[B](c) Decreasing concentration of electrolyte[/B]
(d) Increasing concentration of electrolyte

(v) There is a large positive entropy change for an exothermic reaction. It means that the reaction will be:
(a) possible at high temperatures only
(b) impossible at all temperatures
(c) possible at low temperatures only
(d) possible at all temperatures

(vi) Which of the following statement is false?
(a) the temperature of the system will fall if an exothermic reaction is isolated from its surroundings
(b) Energy is absorbed when one compound is converted into another with higher heat content
(c) the temperature of the system is likely to fall if heat is absorbed during the course of a reaction
(d) None of these

(vii) The H_____ bond is strongest in:
(a) S__H ……O
(b) O_H …….S
(c) F_H ……..O
[B](d) F_H ……..S[/B]

(viii) Heavy water contains:
(a) Large amount of salts
(b) Deuterium
[B](c) O18 [/B]
(d) O16

(ix) pH + pOH of a solution is:
(a) 7
(b) Zero
[B](c) 14 [/B]
(d) -14

(x) The compound that is not Lewis acid:
(a) BF3
[B](b) BaCl2 [/B]
(c) SnCl4
(d) AlCl3

(xi) Strongest acid having Ka:
[B](a) 104 [/B]
(b) 10-4
(c) 1
(d) 10-2

(xii) Ore of Aluminium:
(a) Calamine
(b) Dolomite
[B](c) Bauxite [/B]
(d) Limestone

(xiii) Oxidation number of S in sulphuric acid:
(a) Four
[B](b) Six[/B]
(c) Two
(d) Eight

(xiv) d-block elements form coordination compounds because of:
(a) Small Cationic size
(b) Large ionic Charge
[B](c) Unfilled d-orbitals[/B]
(d) Filled d-orbitals

(xv) Brass is an alloy of:
[B](a) Cu and Zn[/B]
(b) Cu, Ni, Zn
(c) Cu and Ni
(d) Cu, Al, Zn

(xvi) Urea is a high quality nitrogenous fertilizer with:
(a) 76% nitrogen
[B](b) 46% nitrogen [/B]
(c) 66% nitrogen
(d) 26% nitrogen

(xvii) Diamond is:
(a) Good conductor of electricity
[B](b) Bad conductor of electricity[/B]
(c) Bad conductor on heating
(d) Good conductor on heating

(xviii) Carbon monoxide is poisonous gas because it:
(a) replaces oxygen from lungs
[B](b) forms carboxy haemoglobin[/B]
(c) Forms carbon dioxide with oxygen
(d) has a sweet smell

(xix) Rust is:
(a) FeO + Fe(OH)2
(b) Fe2O3 + Fe(OH)2
(c) Fe2O3
[B](d) Fe2O3 + Fe(OH)3[/B]

(xx) Calcium Carbide reacts with water to give:
(a) Methane
(b) Ethylene
[B](c) Acetylene[/B]
(d) Ethane

corrections are welcome..

[B]MCQs of chemistry paper 2 2010[/B]


Q.1. Select the best option/answer and fill in the appropriate box on the Answer Sheet. (20)

(i) Which of the following substituent deactivates benzene ring and is o, p-directing?
(a) __ NH2
[B](b) __ Cl[/B]
(c) __ OCH3
(d) __ OH

(ii) Which of the following is most readily nitrated?
[B](a) Toluene [/B]
(b) Benzaldehyde
(c) Nitrobenzene
(d) Benzoic Acid

(iii) Ketones can be prepared by reaction of Grignard reagent with:
(a) Acid Amides
[B](b) Acid Chloride [/B]
(c ) Carboxylic Acid
(d) Epoxides

(iv) Which of the following statements about the order of reaction is true?
(a) The order of a reaction can only be determined by experiment.
(b) A second order reaction is also bimolecular
[B](c) The order of reaction must be a positive integer[/B]
(d) The order of reaction increases with increasing temperature.

(v) Polysaccharides yield many monosaccharides on:
(a) Hydration
(b) Oxidation
(c) Reduction
[B](d) Hydrolysis[/B]

(vi) Which of the following is not aromatic?
(a) Benzene
[B](b) cyclooctatetraene [/B]
(c) Pyridine
(d) Phenol

(vii) Which of the following is most basic?
(a) H2O
(b) NH3
[B](c) CH3 NH2 [/B]
(d) CH3OH

(viii) Which of the following has lowest pH?
(a) CH3COOH
[B](b) CF3COOH [/B]
(c) ClCH2COOH
(d) Cl3C COOH

(ix) The equilibrium of two readily interconvertible isomers is called:
(a) Stereoisomerism
(b) Metamerism
[B](c) Tautomerism[/B]
(d) Polymorphism

(x) Which of the following compounds exhibit geometrical isomerism?
(a) 1-Pentene
(b) 2-Pentene
(c) 2-methyl –2-Pentene
(d) 2-methyl –2-Butene

(xi) Which of the following gives a tertiary alcohol when treated with Grignard reagent:
(a) HCHO
(b) CH3CHO
(c) C3H5CHO
[B](d) CH3COCH3[/B]

(xii) Which of the following tests is not used to identify aldehydes?
(a) Tollen’s test
(b) Benedict solution test
(c) Fehling solution test
[B](d) Ammonia test[/B]

(xiii) Which is incorrect about alkaloids?
(a) Naturally Occuring
(b) Possess a hetrocyclic ring
(c) Exhibit biological action
[B](d) acidic in nature[/B]

(xiv) Which of the followings will not give iodoform test:
(a) Acetone
[B](b) Ethylacohol [/B]
(c) Benzaldehyde
(d) Acetaldehyde

(xv) The reaction of aniline with bromine water gives:
(a) o-bromoaniline
[B](b) p-bromoaniline [/B]
(c) 2,4-dibromoaniline
(d) 2,4,6-tribromoaniline

(xvi) The reaction of tripalmitin, with sodium hydroxide is called:
(a) Hydrolysis
[B](b) Saponification [/B]
(c) Esterification
(d) Combustion

(xvii) Which one is not Petrochemical?
(a) Napthalene
(b) Mineral Oil
(c) Wax
(d) Table Salt

(xviii) Chemical adsorption:
(a) is exothermic
(b) is irreversible
(c) takes place at high temp.
[B](d) All of these[/B]

(xix) The most commonly used absorbent for chromatographic separation of organic compound is:
(a) Activated charcoal
[B](b) Fuller’s Earth [/B]
(c) Alumina
(d) Silica gel

(xx) Grignard reagent is:
(a) Organo Zinc halide
(b) Organo cadmium bromide
(c) n-Butyl Lithium
[B](d) Organo Magnesium halide[/B]

corrections are required

thanks for sharing Mcqs. plz do post the solved mcqs of any of the last chemistry papers u have. seniors plz share the name of any good book having solved chemistry papers.

[QUOTE=naila cheema;365999]thanks for sharing Mcqs. plz do post the solved mcqs of any of the last chemistry papers u have. seniors plz share the name of any good book having solved chemistry papers.[/QUOTE]

dear i solved chemistry past papers of css myself and i think so there is no book for solved papers ....i will post other solved mcqs as well in the time being...and i request other members having chemistry as optional to contribute

(x) Which of the following compounds exhibit geometrical isomerism?
(a) 1-Pentene
(b) 2-Pentene
(c) 2-methyl –2-Pentene
(d) [B]2-methyl –2-Butene[/B]

(v) There is a large positive entropy change for an exothermic reaction. It means that the reaction will be:
(a) possible at high temperatures only
(b) impossible at all temperatures
(c)[B] possible at low temperatures only[/B]
(d) possible at all temperatures

(vi) Which of the following statement is false?
(a) the temperature of the system will fall if an exothermic reaction is isolated from its surroundings
(b) Energy is absorbed when one compound is converted into another with higher heat content
(c) [B]the temperature of the system is likely to fall if heat is absorbed during the course of a reaction[/B]
(d) None of these

(xvii) Which one is not Petrochemical?
(a) Napthalene
(b) Mineral Oil
(c) Wax
(d)[B] Table Salt[/B]

Dear, i am not doing the exam but still wana help you and other members in Bio and chem.
so you can share your questions, i will try to find out the most appropriate answer.

[QUOTE=Scholar;398606](x) Which of the following compounds exhibit geometrical isomerism?
(a) 1-Pentene
(b) 2-Pentene
(c) 2-methyl –2-Pentene
(d) [B]2-methyl –2-Butene[/B]

(v) There is a large positive entropy change for an exothermic reaction. It means that the reaction will be:
(a) possible at high temperatures only
(b) impossible at all temperatures
(c)[B] possible at low temperatures only[/B]
(d) possible at all temperatures

(vi) Which of the following statement is false?
(a) the temperature of the system will fall if an exothermic reaction is isolated from its surroundings
(b) Energy is absorbed when one compound is converted into another with higher heat content
(c) [B]the temperature of the system is likely to fall if heat is absorbed during the course of a reaction[/B]
(d) None of these

(xvii) Which one is not Petrochemical?
(a) Napthalene
(b) Mineral Oil
(c) Wax
(d)[B] Table Salt[/B][/QUOTE]Thanks

Sent from my ONEPLUS A3000 using Tapatalk