ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which have better penetrating power

• Alpha rays A
• Beta rays B
• Gamma rays C
• X-rays D

• With H₂/Ni CH₃(CH₂)₅CH₂OH A
• With H₂/Ni CH₃(CH₂)₅CH₃ B
• With NaBH₄ CH₃(CH₂)₅CH₂OH C
• With NaBH₄ CH₃(CH₂)₅CHO D

A property which differs fluorine from the other halogens?

• Direct combination with inert gases A
• Uninegative B
• Diatomic C
• ns² , np⁵ D

According to Mendeleev, the properties of the elements are periodic function of their

• Atomic number A
• Atomic volumes B
• Atomic masses C
• Atomic densities D

The addition of a catalyst to a reaction changes the

• Enthalpy A
• Entropy B
• Nature of reactants C
• Energy of activation D

Gases show uniform behaviour towards their

• Internal conditions A
• External conditions B
• Internal and external conditions C
• None of above D

The IUPAC name fo CH₃COCH (CH₃)₂is

• 4-Methylisopropyl ketone A
• 3-Methyl-2 butanone B
• Isopropylmethyl ketone C
• 2 - Methyl- 2 butanone D

The total number of rare earth elements is

• 8 A
• 32 B
• 14 C
• 10 D

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

• HCHO and CH₃CHO A
• CH₃CHO and CH₃COCH B
• CH₃COCH₃and C₆H₅COCH₃ C
• CH₃COOH and CH₃COOCH₃ D

Compounds containing cyanide group (.........C=H) are called:

• Nitrides A
• Nitrites B
• Nitriles C
• Cyanides D

The value of K_pis greater than K_cfor a gaseous reaction when

• Number of molecules of products is greater than the reactants A
• Number of molecules of reactants is greater than those of products B
• Number of molecules of reactants and products equal C
• Catalyst is added D

Which is a component of micro nutrient?

• N A
• Zn B
• P C
• K D

In a solution of CuSO₄how much time will be required to precipitate 2g copper by 0.5 ampere current?

• 12157.48 sec A
• 102 sec B
• 510 sec C
• 642 sec D

Which causes water pollution?

• Smoke/fly ash A
• Automobile exhausts B
• Aeroplnes C
• 2,4-D and pesticides D

Carboxylic acids generally exists in cyclic

• Monomers A
• Dimers B
• Trimers C
• Tetrameter D

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine D

The temperature in the incineration process has a range:

• 900°Cto 1000°C A
• 650 to 1100°C B
• 950°C to 1300°C C
• 500°C to 900°C D

Mass spectrometer measures the

• Exact mass of an element A
• Average mass of an element B
• The number of elements present in a molecule C
• m/e value of a positive ion D

The statement regarding effect of catalyst on reversible reaction is.

• To increase equilibrium constant for forward reaction A
• To increase yield of product in equilibrium B
• To increase the rate constant for both reactions C
• To increase the rate of only for ward reaction D

10g of NaOH has been dissolved per kg of solvent. The molality of solution is :

• .25 m A
• 1.5 m B
• .5 m C
• 2.5 m D

Identify the compound formed, when ethylene combines with water in the presence of 10% sulphuric acid and HgSO₄as catalyst

• Carbinol A
• Methanol B
• Ethanol C
• Glycol D

The C-C bond angles in benzene ring are

• 119° A
• 120° B
• 121° C
• None D

Which of the following salt is used as purgative

• CaSO₄ A
• MgSO₄ B
• BeSO₄ C
• NaCl D

Which of the following will not give iodoform test?

• Ethanol A
• Ethanal B
• Isopropyl alcohol C
• Benzyl alcohol D

Which of the statement is contrary to the first law of thermodynamics

• Energy can neither be created nor destroyed A
• One form of energy can be transferred into an equivalent amount of other kinds of energy B
• In an adiabatic process the work done is independent of its path C
• Continuous production of mechanical work without supplying an equivalent amount of heat is possible D

Ratio of carbon to hydrogen in aromatic compounds is

• Low than alkanes A
• High than alkanes B
• Low than alkenes not high than alkanes C
• High than high than alkenes D

I-Chloropropane has two isomers, it is an example of

• Chain isomerism A
• Position isomerism B
• Functional group isomerism C
• Metamerism D

When chloroform is boiled with NaOH, it gives

• Formic acid A
• Trihydroxymethane B
• Acetylene C
• Sodium formate D

Reaction of Griganard's reagent with CO₂gives:

• Aldehyde A
• Pri-alcohol B
• Sec-alcohal C
• Carboxylic acid D

In a group, the ionization energy

• Increase A
• Decreases B
• Remain constant C
• First increases then decreases D