This document contains questions from a chemistry exam for the Higher Secondary School Certificate (HSSC-II) in Lahore, Pakistan. It includes short answer and long answer questions testing knowledge of topics like the periodic table, chemical reactions (such as SN2 and Friedel-Crafts), industrial processes (nitric acid and caustic soda production), organic chemistry concepts (functional groups, isomers), and more. Students were asked to answer 16 short response questions in Section I and choose 3 of 6 long answer questions involving explanations and diagrams in Section II.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
6.9 PREPARATION OF SALTS
CHEMISTRY KSSM FORM 4
REACTION BETWEEN ACID + ALKALI
REACTION BETWEEN ACID + METAL OXIDE
REACTION BETWEEN ACID + REACTIVE METAL
REACTION BETWEEN ACID + METAL CARBONATE
PURIFICATION OF IMPURE SALTS USINGRECRYSTALLISATION METHOD
DOUBLE DECOMPOSITION REACTION TO PRODUCE INSOLUBLE SALT
Dear Students/Parents
We at 'Apex Institute' are committed to provide our students best quality education with ethics. Moving in this direction, we have decided that unlike other expensive and 5star facility type institutes who are huge investors and advertisers, we shall not invest huge amount of money in advertisements. It shall rather be invested on the betterment, enhancement of quality and resources at our center.
We are just looking forward to have 'word-of-mouth' publicity instead. Because, there is only a satisfied student and his/her parents can judge an institute's quality and it's faculty members coaching.
Those coaching institutes, who are investing highly on advertisements, are actually, wasting their money on it, in a sense. Rather, the money should be invested on highly experienced faculty members and on teaching gears.
We all at 'Apex' are taking this initiative to improve the quality of education along-with each student's development and growth.
Committed to excellence...
With best wishes.
S . Iqbal
( Motivator & Mentor)
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
6.9 PREPARATION OF SALTS
CHEMISTRY KSSM FORM 4
REACTION BETWEEN ACID + ALKALI
REACTION BETWEEN ACID + METAL OXIDE
REACTION BETWEEN ACID + REACTIVE METAL
REACTION BETWEEN ACID + METAL CARBONATE
PURIFICATION OF IMPURE SALTS USINGRECRYSTALLISATION METHOD
DOUBLE DECOMPOSITION REACTION TO PRODUCE INSOLUBLE SALT
Dear Students/Parents
We at 'Apex Institute' are committed to provide our students best quality education with ethics. Moving in this direction, we have decided that unlike other expensive and 5star facility type institutes who are huge investors and advertisers, we shall not invest huge amount of money in advertisements. It shall rather be invested on the betterment, enhancement of quality and resources at our center.
We are just looking forward to have 'word-of-mouth' publicity instead. Because, there is only a satisfied student and his/her parents can judge an institute's quality and it's faculty members coaching.
Those coaching institutes, who are investing highly on advertisements, are actually, wasting their money on it, in a sense. Rather, the money should be invested on highly experienced faculty members and on teaching gears.
We all at 'Apex' are taking this initiative to improve the quality of education along-with each student's development and growth.
Committed to excellence...
With best wishes.
S . Iqbal
( Motivator & Mentor)
1 Question 1 (Alcohols and Carbonyl Compounds - 20 marks.docxjoyjonna282
1
Question 1 (Alcohols and Carbonyl Compounds - 20 marks)
(a) Why does hexan-2-one have a lower boiling point than hexan-2-ol?
O OH
(2)
(b) Dehydration of the compound below in acid gives mainly one product. Suggest, with a
reason, what would be the major product.
H
+
heatOH .
(1)
(c) Esters are known for their very pleasant fragrances. The aroma is dependent on the
starting materials used to prepare the ester. Give the original starting materials used to
produce the ester below.
O
O
(2)
(d) The substitution reaction between the alkyl halide below and water results in an alcohol.
2
(i) Show the full mechanism of the reaction as it occurs via an SN1 pathway. Identify
all the elements of the reaction.
(5)
(ii) Which factor can be investigated to determine if the reaction proceeds by a
unimolecular or bimolecular mechanism, and how is it relevant in terms of the
mechanism?
(2)
(iii) Explain briefly whether the chlorine analogue of the substrate would react faster
or slower than the given compound above.
(2)
(iv) Draw a fully labeled energy profile for this SN1 reaction.
(4)
3
Question 2 (Saccharides - Total 14 marks)
(a) Below is the Fischer projection of a sugar.
CHO
HHO
OHH
OHH
HHO
CH2OH
(i) Show a Haworth projection of the cyclic form of the sugar, identifying the
anomeric centre as either or .
(2)
(ii) Fully classify the saccharide above in terms of its optical rotation, carbon skeleton
and class.
(2)
(iii) When the compound is reduced with NaBH4, is the product optically active or
not? Explain your answer.
(2)
(b) What is the process called when the optical rotation of an aqueous solution of a pure
anomer of glucose changes with time? Use chemical structures to demonstrate what is
happening.
(3)
4
(c) The following question relates to the structure below:
A. B.
C.
O
HO
HO
OH
O
OH
O
HO
OH
O
HO
OH
O
O
HO2C
OH OH
(i) Use arrows to identify the glycoside links between sugars a and b as well as b and
c and name them appropriately.
(3)
(ii) Explain if this is a reducing sugar or not.
(2)
5
Question 3 (Amines and Amides - Total 11 marks)
(a) Briefly explain why amines have lower boiling points than amides of similar molecular
weight.
(2)
(b) (i) What is the name of the following amine?
N
(1)
(ii) What is the structure of 2,2-dimethylpentanamine?
(1)
(c) Give the outcome of the reactions below.
(i) Ph-NH2 + CH3-CO2H
(1)
(ii)
H3O
+
N
H
O
(2)
(d) The structure of N-methylpropanamide is given below.
N
H
O
Predict the solubility of N-methylpropanamide by showing the full extent of H-
bonding between the compound and water.
(2)
6
(e) Explain with refe ...
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
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The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
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1. FAZAIA SCHOOLS & COLLEGES
SEND-UP EXAM: CHEMISTRY HSSC-II (Lahore Board)
(Session 2017 – 18)
Roll No.
Name of Candidate
SECTION – I (Marks 44)
Time allowed : 2 Hours and 35 Minutes (Total Marks: 68)
NOTE: Questions therein are to be answered on the separately provided Answer Book. Use supplementary
answer sheet i.e., sheet B if required. Write your answers neatly and legibly.
Q.2. Write short answers to any Eight questions. (8× 2 = 16)
(i) Why d and f block element, are called transition elements.?
(ii) The melting and boiling points of the elements increase from left to right up to the middle
of S and P block elements and decreases on ward.
(iii) The oxidation state vary in a period but remain almost constant in a group.
(iv) Define group and period.
(v) Why lime water turns milky with CO2 but becomes clear with excess of CO2?
(vi) Why 2 % gypsum is added in the cement.
(vii) How lime mortar is prepared.
(viii) Why aqueous solution of Na2CO3 is alkaline in nature?
(ix) How may ethane be converted into ethyl alcohol?
(x) How will you convert 1-butene to 1- butyne. ?
(xi) Write any two methods to prepare alkane.
(xii) Write formula for each of following compound.
(a) 2,5 Heptadiene (b) 1-Butyne
Q.3. Write short answers to any Eight questions. - (8× 2 = 16)
(i) Why does aqua regia dissolve gold and platinum?
(ii) Write down the equation for the reaction between conc, H2SO4and Cu.And explain what
type of reaction is it
(iii) Why is So3 dissulved in H2SO4 and not is water?
(iv) Describe ring test for the confirmation of the presence of nitrate ion in solution.
(v) Write mechanism for nitration of benzene.
(vi) How will you prepare following compounds in two steps.
(a) p- chlorinator benzene
(b) m- chlorinator benzene
(vii) Write structural formulas for
(a) 2,4,6, - Trinitrotoluene (b) m- Nitro phenol
(viii) What is wurtz fitting Reaction?
(ix) How does ethyl magnesium bromide react with HCHO followed by hydrolysis in presence
of an acid.
2. (x) Write any two methods of preparation of alkyl halide form alcohol.
(xi) How does ethyl bromide react with NH3 ?
(xii) Write reaction of ethyl magnesium bromide with ethylene epoxide followed by acid
hydrolyses.
Q.4. Write short answer of any SIX questions. - (6× 2 = 12)
(i) Why are liquid silicones preferred over ordinary organic lubricants. ?
(ii) How does borax serve as a water softening agent.
(iii) Write a note on borax bead test along with its chemistry.
(iv) What isdisproportionation reaction. Explain. your answer with an example.
(v) Give any two applications of noble gases.
(vi) What are homocyclic and heterocyclic compounds? Give one example of each?
(vii) Write structural formula of two possible isomers of C4H10.
(viii) What is functional group isomerism.
(ix) Give systematic names to following complexes
(a) Na3[COF6] (b) [Pt(OH)2 (NH3)4]SO4
SECTION – II (Marks 24)
NOTE: Attempt any Three (3) Questions. (3X8=24)
Q.5. (a) Discuss groups and periods in the modern periodic table.
(b) Write a note on SN2 reactions.
Q.6. (a) Describe with diagram the manufacture of caustic soda by Neloson cell.
(b) Write a note on Friedel Craft Alkylation and Acylation reaction.
Q.7. (a) Write methods of preparation of Borax .
(b) Show by means of chemical equations , how the following cycle of changes may be
affected
Q.8. (a) Discuss Birkel and Eyde’s process for manufacture of nitric acid.
(b) Write a note on cracking of petroleum.
Q.9. (a) Discuss the reactions when bleaching powder reacts with the following reagents
dil H2SO4 ,excess of conc H2SO4 , NH3 , HI and CO2
(b) What is corrosion , Explain electrochemical theory of corrosion.