ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Electronegativity values of the elements F, CI and Br vary

• F > CI > Br A
• Br > CI > F B
• Cl > Br > F C
• CI > F > Br D

De halogenatiion of tetrahalides happens in the presence of active metal like

• Zn A
• Mg B
• Both a and b C
• None of them D

Cement plaster is made by mixing plaster of paris with:

• glue or oil A
• gypsom B
• glycol C
• alum or borax D

Which of the following gives iodoform on heating with a solution of I₂containing Na₂CO₃?

• Ethyl alcohol A
• Acetone B
• Ethyl alcohol as well as acetone C
• Methyl alcohol D

The order of reactivity of halogen acids for reaction with C₂H₅OH is

• HCl > HBr > HI A
• HI > HBr > HCl B
• HBr > HI > HCl C
• HBr > HCl > HI D

The proteins which are derived by conjugated proteins are called as

• Simple protein A
• Complex protein B
• Derived protein C
• None D

Specific gravity of HNO₃ is

• 1.35 A
• 1.53 B
• 1.39 C
• 1.93 D

• s A
• p B
• d C
• f D

The radiations with wavelength shorter than violet light are called

• Ultraviolet A
• Infrared B
• Microwave C
• Radio frequency D

Mass of simple electron is:

• 9.1 x 10^-31 kg

  A

• 9.1 x 10^-30 kg

  B

• 1.66 x 10^-31 kg

  C

• 9.1 x 10^-31 kg

  D

Which of the hydrogen halides has the highest percentage of character?

• Hl A
• HF B
• HCl C
• HBr D

which of the following has smaller size:

• Fe+³

  A

• Fe+²

  B

• Fe+¹

  C

• Fe

  D

What will happen if LiAIH₄is added to an ester?

• Two units of alcohol are obtained A
• One unit of alcohol and one unit of acid is obtained B
• Two units of acids are obtained C
• None of these D

If an electrophile attacks then ______ bond breaks first

• C - H A
• O - H B
• C - O C
• None of these D

Which one of the following compounds does not have the empirical formula CH₂O?

• Ethanoic acid, CH₃CO₂H A
• Ethanol, CH₃CH₂OH B
• Glucose, C₆H₁₂O₆ C
• Methanal, HCHO D

• Three times A
• Six times B
• Nine times C
• Two times D

On passing ethane into concentrated suphuric acid the intermediate compound formed on hydrolysis with boiling water gives

• Methyl alcohol A
• Ethyl alcohol B
• Ethyl hydrogen sulphate C
• Methyl hydrogen sulphate D

The noble gas have

• Very low ionization energies A
• High boiling points B
• No electron pair interaction C
• No van Der Waal's forces D

The range of UV-B is:

• 320 to 400 nm A
• 200 to 280 nm B
• 280 to 320 nm C
• 50 to 400 nm D

The most reactive elements are

• Group IV-A A
• Group V-A B
• Group VI-A C
• Group VII-A D

Periodic law was given by:

• Al-Razi A
• Dobriener B
• Newland C
• Mendeleev D

CL₂, N₂ and O_{2 are:}

• Diatomic molecules

  A

• Hetero atomic molecules

  B

• Poly-atomic molecules

  C
• Mono-atomic molecules D

Amides on treatment with Br₂and KOH are converted into amines, the reaction is known as

• Hoffmann's bromamide reaction A
• Hoffmann's methylation B
• Gabriel phthalimide reaction C
• H.V.Z reaction D

Which is not a nucleophile

• Benzene A
• Chlorine B
• Ethene C
• Ethanol D

The color of ppts formed by Fehling's test is

• Brick red A
• Red B
• Yellow C
• Orange D

Which halogen occurs naturally in a positive oxidation state?

• Fluorine A
• Chlorine B
• Bromine C
• Iodine D

• Reaction occurs at STP A
• Reaction is exothermic B
• Reaction is endothermic C
• Number of moles of production and reactant are same D

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

• 10 A
• 50 B
• 30 C
• 96.5 D

Which one of the following reacts immediately with conc. HCI in the presence of ZnCI₂

• Primary alcohol A
• Secondary alcohol B
• Tertiary alcohol C
• Ether D

The sun of all the energies of atoms, molecule, ion, within system is called

• Enthalpy A
• K.E. of the system B
• Internal energy C
• None D