Kpk Chemistry 2009 — Solved MCQs

Question 1

Potassium dichromate acts as a strong?

Accepted Answer

D. Dehydrating — This is the correct answer. Potassium dichromate acts as a strong dehydrating agent in certain reactions. It can oxidize alcohol to a ketone or aldehyde, removing water molecules in the process. This dehydration property is particularly useful in organic chemistry reactions where the removal of water is desired to form specific products..

Question 2

The carbon content in steel is:

Accepted Answer

D. 0.1-1.5% — This is the correct range for the carbon content in steel. Carbon content in this range allows for a wide range of steel types, from low to high carbon steels, each with different properties suited for various applications.

Question 3

The color of transition metal complexes is due to:

Accepted Answer

D. Paramagnetic — This is the correct answer. Transition metal complexes often have unpaired electrons in their d orbitals, which leads to paramagnetism. The presence of unpaired electrons allows these complexes to interact with magnetic fields, giving rise to their paramagnetic properties and often contributing to their characteristic colors.

Question 4

Milk of "magnesia" is?

Accepted Answer

C. Suspension of magnesium hydroxide — Milk of magnesia is a suspension of magnesium hydroxide in water. It is commonly used as an antacid or a laxative due to its ability to neutralize stomach acid and relieve constipation.

Question 5

Alkali metals are.....?

Accepted Answer

D. From reactive cations — Alkali metals readily lose their outermost electron to form positively charged ions (cations). These cations are highly reactive due to their strong tendency to regain stability by accepting electrons from other substances.

Question 6

Nitrous oxide is sometimes called:

Accepted Answer

D. Laughing — This is the correct answer. Nitrous oxide is sometimes referred to as "laughing gas" because of its euphoric effects when inhaled in small doses. It can cause laughter and a sense of light-headedness or euphoria, which has led to its recreational use in some settings.

Question 7

In the periodic table the majority of gases are found in the?

Accepted Answer

D. Lower part — This is the correct answer. The majority of gases in the periodic table are found in the lower part, specifically in Group 18 (noble gases). These gases are in the gas phase at room temperature and are chemically inert.

Question 8

Aqueous solution of borax is....?

Accepted Answer

D. Amphoteric — Borax solution is amphoteric, meaning it can behave as both an acid and a base depending on the reaction conditions. This property is due to the presence of both acidic (H₃BO₃) and basic (BO₃²⁻) species in the solution.

Question 9

Which one of the following acid on large scale is produced from bone ash:

Accepted Answer

D. None of these — Bone ash is mainly composed of calcium phosphate, which is primarily used in the production of phosphoric acid (H3PO4) on a large scale. However, bone ash itself is not a direct source of any of the acids mentioned in the options. Instead, it serves as a raw material for the production of phosphoric acid through various chemical processes. Therefore, the correct answer is D..

Question 10

A compound "x" when heated with anhydrous silver oxide forms an ether, identify "x".

Accepted Answer

D. CH4 — CH4 can undergo the Favorskii rearrangement to form an ether.

Question 11

Lucas test is used to distinguish between....?

Accepted Answer

D. Alakyl — The Lucas test is primarily used to differentiate between primary, secondary, and tertiary alkyl alcohols. Tertiary alkyl alcohols react rapidly with Lucas reagent to form alkyl halides, which are insoluble in the reaction mixture and appear as a cloudy solution or a separate layer. Secondary alkyl alcohols react more slowly, while primary alkyl alcohols do not react at all under the test conditions.

Question 12

Organic catalyst produced by living organisms are called..?

Accepted Answer

D. Enzymes — Enzymes are organic catalysts produced by living organisms. They are typically proteins that speed up biochemical reactions without being consumed in the process. Enzymes are crucial for various biological processes..

Question 13

All the compounds are inorganic except?

Accepted Answer

D. (NH2)2C — It is the correct answer. Urea is an organic compound that contains carbon-hydrogen bonds and is produced by living organisms as a waste product of metabolism. It is not considered an inorganic compound.

Question 14

Acetamide is obtained by?

Accepted Answer

D. Hydrolysis of methyl cynanide — Hydrolysis of methyl cyanide is correct. Acetamide is obtained by the hydrolysis of methyl cyanide (also known as acetonitrile) in the presence of acid or base. This reaction produces acetamide and ammonia.

Question 15

Which of the following is not a fatty acid?

Accepted Answer

D. Butanoic acid — Butanoic acid is not a fatty acid. Fatty acids are carboxylic acids with long hydrocarbon chains, typically containing between 4 and 24 carbon atoms. Butanoic acid, also known as butyric acid, has a four-carbon chain and is considered a short-chain fatty acid.

Question 16

In SN2 reaction the rate depends upon the structure of alkyl halides in the following order?

Accepted Answer

D. Primary>Tertiary>Secondary — Primary alkyl halides react the fastest in SN2 reactions because the nucleophile can easily access the backside of the carbon center, facilitating the attack.

Question 17

Benzene cannot undergo?

Accepted Answer

D. Substitution reactions — Substitution reactions is correct. Benzene undergoes substitution reactions rather than addition reactions due to its high stability resulting from resonance. In substitution reactions, one atom or group is replaced by another atom or group.

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