ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

In a chemical change, the energy in the form of heat will either be evolved or absorbed and this is called

• Endothermic A
• Heat of products B
• Exothermic reaction C
• Heat of reaction D

Equal masses of methane and oxygen are mixed in an empty container at 25°CThe fraction of total pressure exerted by oxygen is :

• 1/2 A
• 8/9 B
• 1/9 C
• 16/17 D

In the electrolysis of aqueous solution of sodium nitrate, the ions which are reduced at the cathode are

• H₃O⁺ A
• Na⁺ B
• OH^- C
• NO^3- D

Acidification of the soils due to addition of synthetic nitrogen fertilizer, is corrected by using

• Gypsum A
• Sodium nitrate B
• Limestone C
• Potassium nitrate D

The color of ppts formed by Fehling's test is

• Brick red A
• Red B
• Yellow C
• Orange D

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

• Mono-atomic molecules A
• Diatomic molecules B
• Poly-atomic molecules C

• Hetero atomic molecules

  D

Unit of ozone is:

• Debye A
• Dobson B
• Esu C
• Coulumb D

Ionic Solids are characterized by

• Low melting points A
• Good conductivity in solid state B
• High vapour pressure C
• Solubility in polar solvents D

Which of the following is a not typical transition element

• Cr A
• Mn B
• Zn C
• Fe D

In t-butyl alcohol, the tertiary carbon is bonded to:

• Two hydrogen atom A
• Three hydrogen atoms B
• One hydrogen atoms C
• No hydrogen atoms D

Calcium carbonates contains oxygen in it:

• 48% A
• 50% B
• 53% C
• 60% D

Factors affecting denaturation of proteins:

• Change in temp and pH A
• Strong reducing agent B
• Strong oxidizing agent C
• All of these D

Which of the following is not present in nucleotide?

• Guanine A
• Cytosine B
• Adenine C
• Tryoxine D

Stainless steel contains ion and carbon along with

• Ni and Cr A
• Cr and Co B
• Co and Mn C
• Mn and Ni D

Mustard gas is a

• Gas A
• High boiling speed B
• High melting liquid C
• Steam D

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

• Fibre A
• Plastic B
• Varnish C
• Polyamide resin D

• 2 A
• 3 B
• 4 C
• 9 D

Which of the hydrogen halides has the highest percentage of ionic character

• HCl A
• HBr B
• HF C
• HI D

denaturing of alcohol is done by adding methanol in ethanol:

• 10% A
• 20% B
• 30% C
• 40% D

Which phosphorus is the most poisonous?

• White A
• Red B
• Black C
• All D

Shahi Qilla may be destroyed by

• Flood in Ravi A
• Temperature mediated spoilage of marble B
• Air pollutants from Lahore chemical industries C
• All the above D

The ratio of moles of a particular component of solution to total moles of all components of solution is :

• Mole fraction. A
• Molality. B
• Molarity. C
• Normality. D

All facts of chemistry must be in simple logical patterns because chemistry is a subject:

• Simple A
• Complex B
• Un-understandable C
• Easy D

Which of the following elements is most metallic?

• P A
• As B
• Sb C
• Bi D

The polymers which can be re-softened again and again are caled

• Thermoplastic A
• Thermosetting B
• Both a and b C
• None D

Which behaves ass insulator for animals body?

• Carbohydrates A
• Protiens B
• Fats C
• skin D

The basic difference between synthetic and natural fertilizer is in their

• Rae material A
• Crop application B
• Usage C
• Shapes D

Hydrolysis of Grignard's reagent gives:

• Alcohol A
• Halide B
• Alkyl C
• Alkane D

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will be

• Remain unchanged A
• Doubled B
• Reduced C
• Increased four times D

• Pent -1-ene-3-yne A
• 2-pentyne-4-ene B
• 1-pentene-3-yne C
• Pent-2-yen-4-ene D