ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

In purification of potable water the coagulant used is

• Nickle sulpahte A
• Copper sulpahte B
• Barium sulpahte C
• Alum D

Which of the following contains single bonds

• Benzene A
• Alkyne B
• Alkene C
• Alkane D

• 0 1 A
• 0 2 B
• 1 1 C
• 1 2 D

The fourth period contains elements

• 8 A
• 16 B
• 18 C
• 32 D

Which of the following react with NaOH to produce an acid and an alcohol?

• NCHO A
• CH₃COOH B
• CH₃CH₂COOH C
• C₆H₅COOH D

With the progressive of the reaction the slope of the curve between concentration of product and time

• Gradually becomes more steep A
• Gradually becomes less steep B
• No change occurs in slope C
• None of these occurs D

The tip of funnel should be 1 or 2cm larger than the circle of the

• Beaker A
• Solid B
• Filter paper C
• Liquid D

Rates of organic reactions are

• Fast A
• Very fast B
• Slow C
• Non-reactive D

Colour of N₂O₄ is

• Raddish brown A
• Yellow B
• Colouries C
• green D

The three dimensional folding and twisting of a polypeptide chain give rise to

• Primary structure A
• Secondary structure B
• Tertiary structure C
• All of these tertiary D

P₂O₅is heated with water to give

• Hypophosphorus acid A
• Phosphorus acid B
• Hypophosphorus acid C
• Orthophosphorus acid D

An organic compound A reacts with methyl magnesium iodide to form an addition product which on hydrolysis forms the compound B . Compound B gives blue colour salt in Victor Meyer's test.The compounds A and B are respectively

• Acetaldehyde, tertiary butyl alcohol A
• Acetaldehyde, ethyl alcohol B
• Acetaldehyde, isopropyl alcohol C
• Acetone, isopropyl alcohol D

The periodic table gives basic framework to study the periodic.

• Elements only A
• Compounds only B
• Elements and their compounds C
• Elements and their inorganic D

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

• 1-propanol A
• 2-propanol B
• 2-Methyl-2-propanol C
• Ethanol D

According to Boyle's law, which parameters give a straight line parallel to axis-s, when we plot a graph between:

• V and T A
• P and V B
• P and 1/V C
• P and PV D

Which one of the following is a water soluble vitamin

• D A
• K B
• A C
• Ascorbic acid (Vic C) D

C₆H₁₂O₆ is molecualr formula of:

• Glucose A
• Dextrose B
• Fructose C
• All of these D

Camphor is often used in molecular mass determination because

• It is solvent for organic substances A
• It is readily available B
• It has a very high cryoscopic constant C
• It is volatile D

Vinegar is dilute solution of:

• Acitic acid A
• Formic acid B
• Butyric acid C
• Propionic acid D

Which is the used as test for the presence of alkenes

• Reaction of cold dilute alkaline KMnO₄ A
• Combustion B
• Polymerization C
• Catalytic hydrogenation D

Absolute alcohol is obtained by adding rectified apirit in alcohol:

• Water A
• Na₂CO₃ B
• NaOH C
• CaO D

Which one of the following is not a nucleophile

• H₂O A
• H₂S B
• BF₃ C
• NH₃ D

Which woody raw material is used for manufacture of paper pulp?

• Cotton A
• Bagasse B
• Popular C
• Rice straw D

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

• Na₂CO₃ A
• NaHCO₃ B
• Ca(OH)₂ C
• CaCO₃ D

Formation of PVC form vinyl chloride is an example of

• Substitution reaction A
• Addition polymerization B
• Condensational reaction C
• Aldol condensation D

Nobel gases are placed group:

• Group IV-A A
• Group V-A B
• Group VI-A C
• Group VII-A D

Physical properties of alkanes increase with increase of all physical constants except

• Boiling points A
• Melting points B
• Density C
• Solubility D

Which element does not belong to 4d series

• Y A
• Zr B
• Mo C
• Zn D

Which of the following elements does not show variable oxidation states?

• Copper A
• Iron B
• Zinc C
• Titanium D

Milk of lime is

• MgO A
• CaO B
• Ca(OH)₂ C
• Mg(OH)₂ D