ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The element which has a simple cubic lattice in solid state is

• Se A
• Te B
• Po C
• None of these D

Formation of PVC form vinyl chloride is an example of

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

Methyl alcohol is not used

• As a solvent A
• A an anti-freezing agent B
• As a substitute for petrol C
• For denaturing of ethyl alcohol D

Which is the most volatile compound

• Hl A
• HCl B
• HBr C
• HF D

Aromatic compounds burn with sooty flame cause:

• They have high percentage of hydrogan A
• They have ring structure B
• They have high percentage of carbon C
• They resist reaction with air D

• 0 dm³ A
• 3 dm³ B
• 2 dm³ C
• 3 dm³ D

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

• Increases A
• Decreases B
• Reaming same C
• Orbits coincide D

Astatine belongs to group:

• I-A A
• II-A B
• III-A C
• VII-A D

Which compound was recognized the parent member of aromatic compounds

• Aniline A
• Phenol B
• Benzene C
• Toluene D

Ammonium nitrate fertilizer is not used for which crop?

• Cotton A
• Wheat B
• Sugar-cane C
• Paddy rice D

Which halogen will react spontaneously with Au(s)to produce Au3++

• Br2 A
• F2 B
• I2 C
• Cl2 D

The compounds which have any atom other than Carbon atom, in rings are called as

• Monocyclic A
• Heterocyclic B
• Homocyclic C
• None of the above D

The amino group in 19α-amino acids is primary; only oneα-amino acid has secondary amino group which one is that

• Alanine A
• Glutamic acid B
• Glycine C
• Proline D

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

• 0.02 A
• 0.2 B
• 0.4 C
• 0.8 D

1.1 mol of A is mixed with 2.2 mol of B and the mixture is kept in on litre flask till the equilibrium is reached. At equilibrium, 0.2 mol of C is formed. If the equilibrium reaction is A+2B 2C+D, the value of equilibrium constant is

• 0.002 A
• 0.004 B
• 0.001 C
• 0.003 D

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

Metals like Fe, Mg, Al, Cr, Zn have more negative reduction potentials that is whey

• These don't react with steam A
• These react very slowly with steam to liberate H₂gas B
• These react rapidly with steam to produce the metallic oxides and liberate H₂gas C
• These react with cold water violently D

Tungsten and Uranium are turned to an reaction with HNO₃:

• Oxides A
• chlorides B
• Nitrides C
• Nitrates D

When aluminium electrode is coupled with copper electrode in a galvanic cell :

• Reduction takes place at aluminium electrode. A
• Oxidation takes place at copper electrode. B
• Reduction takes place at copper electrode. C
• Both (a) and (c) D

An alkane is produced when an alkyle halide reacts with zinc in the presence of

• HCl A
• CH₃COOH B
• Both a & b C
• None D

Optical rotation method is sued when

• Reaction involve ions A
• Change of refractive indices B
• Reactions involving change of optical activity C
• None of the above D

Ethyl chloride on treatment with aqueous alkali gives

• Ethane A
• Ethene B
• Ethanal C
• Ethanol D

The number of elements in the 4th periods of periodic table is

• 8 A
• 10 B
• 18 C
• 32 D

Bleaching powder may be produced by passing chlorine over

• Calcium carbonate A
• Hydrated calcium sulphate B
• Anhydrous calcium sulphate C
• Calcium hydroxide D

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

• q_p= q_v A
• q_p< q_v B
• q_p> q_v C
• q_p= qv/2 D

Which compound would undergo nucleophilic addition

• Ethene, C₂H₄ A
• Bromoethane, C₂H₅Br B
• Ethanal, CH₃CHO C
• Ethane, C₂H₆ D

• 1st order A
• 2nd order B
• Zero order C
• 3rd order D

Which is an amorphous solid.

• NaCl A
• NaOH B
• Diamond C
• Rubber D

Which is not nitrogeneous fertilizers?

• (NH₄)₂HPO₄ A
• NH₄NO₃ B
• Urea C
• Calcium phosphate D

Isopropyl alcohol on oxidation forms

• Acetone A
• Ether B
• Ethylene C
• Acetaldehyde D