ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

• Ag⁺ A
• Cu²⁺ B
• Al³⁺ C
• Si⁴⁺ D

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

• Butanol A
• Butanoic acid B
• Butanone C
• Butane D

The pH of 10^-3mole dm^-3of an aqueous solution of H₂SO₄is

• 3.0 A
• 2.7 B
• 2.0 C
• 1.5 D

Amiino acids are building blocks of:

• Protein A
• Carbohydrates B
• Lipids C
• Fats D

Which statement in not correct about alcohol?

• Ethyl alcohol is heavier than water A
• Ethyl alcohol ecaporates more quickly B
• Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms C
• Alcohol produces H₂by reaction with sodium metal D

• 2, 2, 4-trimethylpentane A
• 2, 4, 4-trimethylpentane B
• 2, 4, 4-methyepentane C
• 2, 2, 4-methylpentane D

Hydration energy depends upon:

• Change of Ion A
• Size of Ion B
• Charge to size ratio C
• Heat changes D

Which Statement about gases is not correct?

• They spread throughout the vessel A
• Pressure is due to collision B
• There are larger spaces between the molecules C
• Molecules are arranged regularly D

Which one is a nitrogen fertilizer

• Urea A
• Calcium sulphate B
• Potassium phospahte C
• Magnesium carbonate D

• A strong reducing agent A
• A strong oxidising agent B
• Better oxidising agent than hydrogen C
• Less reducing agent than hydrogen D

Which one of the following has continuous solubility curve

• NH₄NO₃ A
• CaCI B
• CaCI₂. 6H₂O C
• Na₂SO₄. 10H₂O D

Silicon atom is hybridized:

• sp A
• sp² B
• sp³ C
• dsp² D

All alkali metals react with acetylene to form acetylides except:

• Li A
• Na B
• K C
• Rb D

The total number of possible values of magnetic quantum number for the value of l=3 is

• 3 A
• 1 B
• 5 C
• 7 D

Indicate the correct statement

• All lanthanidees are present in the same group A
• All halogens are present in the same period B
• All the alkali metals are present in the same group C
• All the noble gases are present int he same period D

Which one of the following is (m-xylene)

• 1,2 dimethyl benzene A
• 1,3 dimethyl benzene B
• 1,5 dimethyl benzene C
• 1,4 dimethyl benzene D

Energy of electron in first orbit of H atom is

• -45.32 KJ/mole A
• -82.08 KJ/mole B
• -52.53 KJ/mole C
• -1313.31 KJ/mole D

During nitration of benzene. the active nitrating agent is

• NO₃^-1 A
• NO₂⁺ B
• NO₂^-1 C
• HNO₃ D

If carbon dioxide is bubbled through solution of Grignard's reagent in ether and the resultant product is reacted with hydrochloric acid, it gives

• An alkane A
• Al alcohol B
• A carboxylic acid C
• An aldehyde D

Catalytic oxidation of alkanes is used for the preparation of

• Adehydes A
• Ketones B
• Fatty acid C
• Carbonyylic acids D

In fructose the possible optical isomers are

• 12 A
• 8 B
• 16 C
• 4 D

The addition of unsymmetrical reagent to unsymmetrical alkene is in accordance with the rule:

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion Principle C
• Auf bau Principle D

The detection of functional group is called :

• Numerical analysis. A
• Qualitative analysis. B
• Combustion analysis. C
• Quantitative analysis. D

When metallic sodium in ether is heated with ethyl chloride, which alkane is formed

• Propane A
• Ethane B
• Iso-butane C
• N-butane D

In sp²type hybridization the three equivalent sp²orbitals lie in the same plane and at angle of

• 0° A
• 60° B
• 120° C
• 180° D

50 cm³of 0.05 molar nrea (N₂H₄CO) solution has % W/N concentration

• 6% A
• 3% B
• 0.3 % C
• 0.6 % D

The solubility of PbF₂is 2.6 x 10^-3mole dm^-3 then its solubility product is

• 2.6 x 10^-3 A
• 6.76 x 10^-6 B
• 5.2 x 10^-6 C
• 7.0 x 10^-8 D

Which is not a steroid

• Cholesterol A
• Ergosterol B
• Phospholipids C
• None of these D

The equivalent weight of KMnO₄(formula weight = M) when it is used as an oxidant in neutral medium is

• M A
• M/2 B
• M/3 C
• M/5 D

Two H-atom combine to form a strong H₂molecule due to

• Increase in potential energy A
• Decrease in potential energy B
• Energy remains unchanged C
• Distance is increased D