ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Calorie is equivalent to :

• 0.4184 J A
• 4184 J B
• 4.184 J C
• 418.4 J D

• 2-chlorobutanal A
• alfa-chlorobutanal B
• 2-chlorobutyraldehyde C
• alfa- chlorobutyraldehyde D

(CH₂O)_nis general formula for

• Monosaccharides A
• Oiligosaccharides B
• Polysaccharides C
• None of these D

The electronic configuration of an atom/ion can be defined by the following

• Aufbau principle A
• Pauli's exclusion principle B
• Hund's Rule C
• All the above D

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

• Carboxylic acid > phenol > alcohol A
• Carboxylic acid > alcohol > phenol B
• Phenol > carboxylic acid > alcohol C
• Alcohol > phenol > carboxylic acid D

d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect

• They show variable valency A
• Their ions and compounds are coloured B
• They are good conductors of heat and electricity C
• Their compounds are diamagnetic D

Primary alcohols and aldehydes are oxidized to corresponding:

• alkanes A
• alkenes B
• Alkynes C
• Carboxylic Acid D

The method used only for the production of symmetrical alkanes

• Kolb's method A
• Clemmenen B
• Cannizzaro C
• Wolf kishner D

Aliphatic carboxylic acids have carboxyl group attached to:

• Alkyl group A
• Aryl group B
• Phenyl group C
• Benzyl lgroup D

Which of the following will have the same number of molecules at STP ?

• 280 CM³ of CO² and 280 CM³ of N₂O

  A

• 11.2 dm3 of O₂ and 32 g of O₂

  B

• 44 g of CO₂ and 11.2 dm³ of CO

  C

• 28 g of N2 and 5.6 dm³ of oxygen

  D

Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre

• Ch₃CHO A
• CH₃CH₂COCH₂CH₃ B
• CH₃CO₂CH₃ C
• HCHO D

Which element belongs to group V-A?

• Cs A
• Ba B
• Sr C
• Bi D

A compound containing carboxyl group in them are called:

• Ketone A
• Ether B
• Carboxylic acids C
• Polycarboxylic acid D

Which of the following is a pseudo solid?

• CaF₂

  A

• Glass

  B

• NaCL

  C

• All

  D

How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

• 1 g A
• 2 g B
• 10 g C
• 20 g D

Cyclohexane can be converted not benzene in the presence of

• Pt at 100°C A
• Pt at 250°C B
• Pd at room temperature C
• Pt at room temperature D

Sp³ hybridization occurs when carbon is bound to

• Four other atoms A
• Three other atoms B
• Two other atoms C
• One other atoms D

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

• 182 A
• 183 B
• 184 C
• 185 D

Hemoglobin contains nearly:

• 10,000 atoms A
• 100 atoms B
• 1000 atoms C
• 1 atom D

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

• Electrophilic addition A
• Electrophilic substitution B
• Nucleophilic addition C
• Nucleophilic substitution D

Down's cell is used to prepare:

• Sodium carbonate A
• Sodium bicarbonate B
• Sodium metal C
• Sodium hydroxide D

The amount of electricity that can deposit 108 g of silver from silver nitrate solution is

• 1 ampere A
• 1 coulomb B
• 1 faraday C
• 2 ampere D

Which of the following species has unpaired electrons in ant-bonding molecular orbitals?

• O2⁺²

  A

• N2^-2

  B

• B₂

  C

• F₂

  D

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

• Cannizaro reaction A
• Sabatier-secderens reaction B
• Alkylation C
• Kolbe's reaction D

• Increase in concentration of 1 A
• Decrease in concentration of I₂ B
• Increase in temperature C
• Increase in total pressure D

Which of the following is not an element?

• Graphite A
• Diamond B
• 22-Carat gold C
• Rhombic sulphur D

Electron affinity of sulphur is

• More than O and Se A
• More than O but less than Se B
• Less than O but more than Se C
• Equal to O and Se D

Benzene gives reactions generally:

• Electropholic subsitution A
• addition B
• synthesis C
• addition and electropholic subsitution D

Alcohols, phenols and ethers may be considered as derivative of

• Hydrocarbons A
• Benzene B
• Carboxylic acid C
• Water D

Benzene was discovered by first of all

• Michael Faraday A
• Hofmann B
• Ainderson C
• Sorenbon D