ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which reagent is used to reduce a carboxylic group to an alcohol

• H₂/Ni A
• H₂/Pt B
• NaBH₄ C
• LiAIH₄ D

Angle is OF₂is

• 120⁰ A
• 180⁰ B
• 105⁰ C
• 102⁰ D

Dehydrohalogenation of alkyl halides produces

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

Catenation is a process in which carbon shows the properties of making

• Multiple bonds A
• Hybridization B
• Long chains or rings of carbon atom C
• Showing isomerism D

Which of the following liquids has low vapour pressure at 25°C:

• Diethyl ether A
• Acetone. B
• Water. C
• Ethyl alcohol. D

The formula of calcium superphosphate is

• CaHPO₄ A
• CaH₂PO₄ B
• Ca(H₂PO₄)₂ C
• None of these D

Gypsom added in cement is:

• 1% A
• 2% B
• 3% C
• 4% D

SN₂reactions can be best carried out with:

• Prl. alkyl halide A
• Sec. Alkyl halide B
• Ter. Alkyl halide C
• All of three D

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

• He₂ A
• SO₂ B
• PCl₅ C
• N₂ D

Which is aqua regia?

• HCL : NO A
• HCl : HNO₃ B
• HCl : H₂SO₄ C
• H₂SO₄ : HNO₃ D

Silicon atom is hybridized:

• sp A
• sp² B
• sp³ C
• dsp² D

Stainless steel contains Cr upto

• 12% A
• 18% B
• 10% C
• 5% D

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

• Almost forward reaction is completed. A
• Amount of reactant is negligible as compared to product. B
• Amount of product is negligible as compared to reactant. C
• Amount of product is equal to amount of reactant. D

The electron in an atom

• moves randomly around the nucleus A
• has fixed space around the nucleus B
• is stationary in various energy levels C
• moves around its nucleus in definite energy levels D

UV radiations bring about

• Skin cancer A
• Mouth cancer B
• Lung cancer C
• Liver cancer D

ph of the buffer CH₃COOh + CH₃COONa is 3.76. If the mixture contains 1 molar acetic acid and 0.1 molar sodium acetate, then pKa of this buffer is

• 3.76 A
• 4.76 B
• 5.76 C
• 6.76 D

The characteristic reactions of alkanes are

• Addition reactions A
• Substitution reactions B
• Condensation reactions C
• Polymerization reactions D

The avtive mass of 64 g of HI in a two litre flask would be

• 2 A
• 1 B
• 5 C
• 0.25 D

The colour of the transition metal compounds is due to

• p-d transition A
• d-d transition B
• s-p transition C
• None of these D

The disaccharide present in milk is

• Sucrose A
• Maltose B
• Lactose C
• Cellobiose D

To prepare ethanol by fernentation the optimum temp. is

• 10 - 20°C A
• 25 - 30°C B
• 20°C C
• 35°C D

0.5 mole of CH4and 0.5 mole of SO2gases have equal

• Volume A
• Mass in grams B
• Total number of atoms C
• Number of molecules D

Which period starts from ₁₁Sc to ₃₀Zn ?

• First Period A
• Second Period B
• Third Period C
• 4th Period D

Dehydration of an alcohol at 180°

• Alkene A
• Ether B
• Ester C
• An hydride D

Among group V-A elements, the most electronegative element is

• Sb A
• N B
• P C
• As D

When fused PbBr₂is electrolyzed

• Bromine appears at he cathode A
• Lead is deposited at the cathode B
• Lead appears at the anode C
• None of these happens D

• Le-chatlier's principle A
• Only adding catalyst B
• Decreasing pressure C
• Decreasing temperature D

How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

• 3 A
• 4 B
• 5 C
• 6 D

Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent

• Butan-1-ol A
• Butan-2-ol B
• 2-methylpropan-1-ol C
• 2-methylpropan-2-ol D

The gases can be converted into liquids by

• increasing the pressure only A
• Lowering temperature and increasing pressure B
• Increasing pressure and bringing temperature below critical point C
• Lowering temperature only D