ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

5-d series is in the period :

• 4th A
• 5th B
• 6th C
• 7th D

• Initial concentration of reaction A
• Initial concentration of products B
• Final concentration of products C
• Order of the reaction D

Cannizzaro's reaction in not given by

• Formaldehyde A
• Acetaldehyde B
• Benzaldyhyde C
• Trimethylacetaldehyde D

Which three elements are needed for the healthy growth of plants?

• N, S, P A
• N, Ca, P B
• N, P, K C
• N, K, C D

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

• CH₃CHO A
• CH₃CH₂CHO B
• CH₂= CH - CHO C
• HC = C - CHO D

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

• NO₂makes the electron rich ring at ortho and para positions A
• NO₂withdraws electrons at metaposition B
• NO₂donate electrons at m-position C
• NO₂withdraws electrons at ortho and para position D

The widely used nitrogen fertilizer that contains about 46% nitrogen is

• Ammonia A
• Ammonium nitrate B
• Ammonium sulphate C
• Urea D

Most reactive halide towards S_N1 reaction is

• n-Butyl chloride A
• sec-Butyl chloride B
• tert-Butyl choride C
• Allyl chloride D

When two hydrogen atoms approach each other.

• Forces of attraction operate. A
• Forces of repulsion operate. B
• Forces of attraction and repulsion operate simultaneously. C
• Nothing happens. D

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

• Hund's rule A
• Markowvikov's rule B
• Pauli's exclusion principle C
• Auf ban principle D

Coordination number of Pt in [PtCI(NO₂) (NH₃)₄]²⁺is

• 2- A
• 4 B
• 1 C
• 6 D

The bond order in No is 2.5 while that in NO⁺is 3.Which of the following statements is true for these two species?

• Bond length in NO⁺is greater than in NO A
• Bond length in unpredictable B
• Bond length in NO⁺is equal to that in NO C
• Bond length in NO is greater than in NO⁺ D

A peptide having molecular mass upto 10,000 is called a

• Vitamin A
• Protein B
• Polypeptide C
• Dipetide D

The maximum number of electrons in the outermost shall of s-black elements is

• One A
• Two B
• Three C
• Four D

Which one is primary alcohol?

• Buten-2-ol A
• Propan-2-ol B
• Butaon-1-ol C
• 2,3-Dimethylhexane-4-ol D

which one of the following is not a nucleophile?

• H₂O A
• H₂S B
• BF₃ C
• NH₃ D

Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with

• Time A
• Temperature B
• Concentration of reactants C
• Order of reaction D

Which compound of noble gas xenon can be prepared?

• Oxides A
• Fluoride B
• Oxyfluorides C
• All of these D

Rusting of iron is catalysed by

• Fe A
• O₂ B
• Zn C
• H⁺ D

For a gas obeying Boyle's law if pressure is doubled, the volume becomes

• Remains constant A
• Double B
• One half C
• None of above D

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

• 1 : 2 A
• 1 : 1 B
• 1 : 3 C
• 2 : 1 D

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same time in a copper sulphate solution?

• 12.7 gm A
• 15.9 gm B
• 31.8 gm C
• 63.5 gm D

A condensation polymer among the following is

• Dacron A
• PVC B
• Polysterene C
• Teflon 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

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 reaction of alcohol with SOCI₂in the presence of pyridine as catalyst gives

• Acids A
• Acid chloride B
• Alkyl halide C
• Benzene D

The structure of white phosphorus is

• Square planar A
• Pyramidal B
• Tetrahedral C
• Trigonal planer D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

Ethanol can be converted into ethanoic acid by

• Hydrogenation A
• Hydration B
• Oxidation C
• Fermentation D

A chemical reaction is in equilibrium when

• Formation of product is minimum A
• Reactants are completely transformed into products B
• Rates of forward and backward reactions are equal C
• Equal amounts of reactants and products are present D