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2012 28 questions

Q612012 · 19 Aug 2012
Which one among the following transitions is associated with the largest change in energy in hydrogen atom ?
1. A.n = 5 to n = 3
2. B.n = 2 to n = 1
3. C.n = 3 to n = 2
4. D.n = 4 to n = 2
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Answer: B
Q632012 · 19 Aug 2012
Which one among the following does not have an allotrope ?
1. A.Oxygen
2. B.Sulphur
3. C.Nitrogen
4. D.Carbon
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Answer: C
Q642012 · 19 Aug 2012
Match List I with List II and select the correct answer using the code given below the Lists : | List I *(Scientist)* | List II *(Discovery)* | | :--- | :--- | | A. Goldstein | 1. Atomic theory | | B. Chadwick | 2. Proton | | C. JJ Thomson | 3. Neutron | | D. John Dalton | 4. Electron | Code :
1. A.2 3 4 1
2. B.2 4 3 1
3. C.1 4 3 2
4. D.1 3 4 2
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Answer: A
Q662012 · 19 Aug 2012
The most important raw materials used in the manufacture of cement are
1. A.Potassium nitrate, charcoal and sulphur
2. B.Limestone, clay and gypsum
3. C.Transition metal oxides, sodium hydroxide or potassium hydroxide
4. D.Limestone, sodium carbonate and silica
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Answer: B
Q682012 · 19 Aug 2012
Three elements Na, S and O combine to form a compound $N a_{2} S O_{3}$ . What is the valency of S in this compound ?
1. A.2+
2. B.4+
3. C.6+
4. D.8+
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Answer: B
Q692012 · 19 Aug 2012
Which one among the following is the equivalent weight of sulphuric acid ? (Atomic weight : H = 1, S = 32, O = 16)
1. A.98
2. B.60
3. C.100
4. D.49
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Answer: D
Q702012 · 19 Aug 2012
Deionised water is produced by
1. A.Calgon process
2. B.ion-exchange resin process
3. C.Clark's process
4. D.permutit process
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Answer: B
Q712012 · 19 Aug 2012
Which one among the following is a double salt ?
1. A. $K_{4} [Fe (CN)_{6}]$
2. B. $K_{2} S O_{4} \cdot A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O$
3. C. $CuS O_{4} \cdot 5 H_{2} O$
4. D. $NaCl$
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Answer: B
Q722012 · 19 Aug 2012
Which one among the following is the correct order of strength of acids ?
1. A. $H_{2} S O_{4} > H_{3} P O_{3} > C H_{3} COOH$
2. B. $H_{3} P O_{3} > H_{2} S O_{4} > C H_{3} COOH$
3. C. $C H_{3} COOH > H_{3} P O_{3} > H_{2} S O_{4}$
4. D. $C H_{3} COOH > H_{2} S O_{4} > H_{3} P O_{3}$
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Answer: A
Q742012 · 19 Aug 2012
In $KMn O_{4}$ molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively
1. A.+1, +5, -2
2. B.+1, +7, -2
3. C.0, 0, 0
4. D.+1, +7, 0
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Answer: B
Q752012 · 19 Aug 2012
Air is
1. A.always a compound
2. B.always a mixture
3. C.a compound in pollution free zones
4. D.a mixture in industrial zones
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Answer: B
Q942012 · 19 Aug 2012
Consider the following statements: 1. If a piece of bar magnet is broken into two equally long pieces, the pieces will not lose the magnetic properties. 2. Magnetic properties of a substance lie in the atomic level. Which of the statements given above is/are correct?
1. A.1 only
2. B.2 only
3. C.Both 1 and 2
4. D.Neither 1 nor 2
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Answer: C
Q522012 · 15 Apr 2012
Directions
Directions : The following nine (09) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : Statement I : The blue colour of copper sulphate crystal disappears when it is heated strongly.
Statement I : After cutting an apple or a banana, the colour of the cut surface becomes brown. Statement II : Polyphenolic compounds present in fruits get oxidized in air and show colour.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
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Answer: A
Q532012 · 15 Apr 2012
Directions
Directions : The following nine (09) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : Statement I : The blue colour of copper sulphate crystal disappears when it is heated strongly.
Statement I : At high temperature, hydrogen can reduce PbO to elemental lead. Statement II : Hydrogen has great affinity to oxygen.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
Show answer
Answer: A
Q542012 · 15 Apr 2012
Directions
Directions : The following nine (09) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : Statement I : The blue colour of copper sulphate crystal disappears when it is heated strongly.
Statement I : Conversion of blue copper sulphate to black cupric oxide on heating is a physical change. Statement II : A change in which chemical composition does not change is called physical change.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
Show answer
Answer: D
Q572012 · 15 Apr 2012
Directions
Directions : The following nine (09) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : Statement I : The blue colour of copper sulphate crystal disappears when it is heated strongly.
Statement I : A thermos flask is made of double-walled glass bottles. Statement II : Metals are good conductors while gas and air are poor conductors of heat.
1. A.Both the statements are individually true and Statement II is the correct explanation of Statement I
2. B.Both the statements are individually true but Statement II is not the correct explanation of Statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true
Show answer
Answer: B
Q652012 · 15 Apr 2012
Which of the following statements regarding oxidation and reduction are correct? 1. In oxidation, loss of electron takes place whereas in reduction, gain of electron takes place. 2. In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place. 3. Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number. 4. Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number. Select the correct answer using the code given below : Code :
1. A.1 and 3
2. B.2 and 4
3. C.2 and 3
4. D.1 and 4
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Answer: D
Q662012 · 15 Apr 2012
Which one among the following is correct regarding $^{20} Ne$ , $^{23} Na^{+}$ , $^{19} F^{-}$ and $^{24} Mg^{2 +}$ ?
1. A.They are isomers of each other
2. B.They are isotopes of each other
3. C.They are isoelectronic with each other
4. D.All of the above
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Answer: C
Q672012 · 15 Apr 2012
Which of the following pairs is/are correctly matched? 1. Isotopes : Atoms with same atomic number but different atomic mass 2. Isobars : Atoms with same number of neutrons but different atomic number 3. Isotones : Atoms with same mass number but different atomic number Select the correct answer using the code given below : Code :
1. A.1, 2 and 3
2. B.1 only
3. C.1 and 2 only
4. D.2 only
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Answer: B
Q682012 · 15 Apr 2012
Sometimes, indigestion is caused by the secretion of too much hydrochloric acid in the stomach. To ease the pain caused, a tablet can be taken that reacts to reduce the amount of acid present. Which one among the following would be inappropriate for a manufacturer to include as a major reactant in the tablet?
1. A. $CaC O_{3}$
2. B. $MgC O_{3}$
3. C. $NaOH$
4. D. $Mg (OH)_{2}$
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Answer: C
Q702012 · 15 Apr 2012
The nucleus of a singly ionized carbon atom contains
1. A.6 protons and 6 neutrons
2. B.5 protons and 6 neutrons
3. C.6 protons, 6 neutrons and 6 electrons
4. D.12 protons, 6 neutrons and 6 electrons
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Answer: A
Q782012 · 15 Apr 2012
The following equation is an example of a redox reaction, in which $C l_{2}$ is the oxidizing agent and $FeB r_{3}$ is the reducing agent : $2 FeB r_{3} (aq) + 3 C l_{2} (g) = 2 FeC l_{3} (aq) + 3 B r_{2} (l)$ Which one among the following statements is _**incorrect**_ for this redox reaction?
1. A.Oxidizing agents are themselves reduced
2. B.Reducing agents gain or appear to gain electrons
3. C.Reducing agents are themselves oxidized
4. D.Oxidizing agents oxidize other substances
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Answer: B
Q792012 · 15 Apr 2012
Which one among the following nitrogen compounds has the least percentage of nitrogen by mass?
1. A. $(N H_{4})_{3} P O_{4}$
2. B. $N H_{3}$
3. C. $N H_{4} OH$
4. D. $N H_{4} N O_{3}$
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Answer: A
Q802012 · 15 Apr 2012
Which one among the following is the correct order of amount of lime ( $CaO$ ), silica ( $Si O_{2}$ ), alumina ( $A l_{2} O_{3}$ ) and ferric oxide ( $F e_{2} O_{3}$ ) in Portland cement?
1. A. $CaO > Si O_{2} > A l_{2} O_{3} > F e_{2} O_{3}$
2. B. $Si O_{2} > CaO > F e_{2} O_{3} > A l_{2} O_{3}$
3. C. $A l_{2} O_{3} > Si O_{2} > CaO > F e_{2} O_{3}$
4. D. $F e_{2} O_{3} > A l_{2} O_{3} > Si O_{2} > CaO$
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Answer: A
Q812012 · 15 Apr 2012
Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?
1. A. $n = 2$ to $n = 1$
2. B. $n = 3$ to $n = 2$
3. C. $n = 4$ to $n = 3$
4. D. $n = 5$ to $n = 4$
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Answer: A