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Chemistry (Engineering Entrance)

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Which of the following decreases by increasing the temperature of an aqueous solution?

  1. Molality

  2. Molarity

  3. Mole fraction

  4. P.P.M (parts per million)


Correct Option: B
Explanation:

This option is correct as in molarity there is volume term which alters with respect to temperature, M=no. of moles of solute/volume of solution in litres. By increasing the temperature volume expands and molarity decreases.

Which of the following is not correct about chemisorptions?

  1. Heats of adsorption are high.

  2. It is not specific in nature.

  3. It requires activation energy.

  4. It forms unimolicular layer


Correct Option: B
Explanation:

This option is correct as chemisorptions is specific in nature.

With the help of catatyst the rate of reaction increases because it

  1. decreases temperature coefficient

  2. increases activation energy

  3. lowers the energy barriers for the reaction

  4. increases collision diameter


Correct Option: C
Explanation:

This option is correct as with the help of catatyst the rate of reaction increase because it lowers the energy barriers for the reaction.

Which of the following is catalytic promoter?

  1. Arsenic

  2. CO

  3. Molybdenum

  4. None of these


Correct Option: C
Explanation:

This is option is correct because it is a catalytic promoter. It acts as a promoter for iron catalyst in the manufacture of ammonia by Haber's process.

What is shape selective catalysis?

  1. Catalysis by zeolite

  2. Catalysis by CO

  3. Catalysis by molybdenum

  4. Catalysis by arsenic


Correct Option: A
Explanation:

This option is correct as shape selective catalysis is catalysis by zeolite. The reaction taking place in zeolite depends on the size and shape of the reactant and product molecules as compared to those pores and cavities of zeolite, that is why it is called as shape selective catalysis.

Which of the following is correct?

  1. Mole fraction changes with temperature.

  2. Molality changes with temperature.

  3. Molality does not changes with temperature

  4. Molarity does not change with temperature


Correct Option: C
Explanation:

This option is correct as molality does not changes with temperature as there is no volume term in the formula of molality, M = no. of moles of the solute/mass of solvent in kg.

The formation of micelles occurs only beyond a certain level and is called

  1. critial temperature

  2. lower critical solution temperature (LCST)

  3. Kraft temperature

  4. temperature coefficient


Correct Option: C
Explanation:

This option is correct as the formation of micelles occurs only beyond a certain level and is called Kraft temperature.

Actinoids series contains

  1. 14 elements

  2. 10 elements

  3. 9 elements

  4. 7 elements


Correct Option: A
Explanation:

This option is correct as there are 14 elements in actinoids series, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr

Which of the following is the diamagnetic subustance?

  1. O2

  2. NaCl

  3. Fe

  4. Ni and CO


Correct Option: B
Explanation:

This option is correct as diamagnetic behaviour is shown by those subustances which contain fully filled orbitals. No unpaired electron is present, and this condition is fulfilled by the NaCl. This subustance is weakly repelled by external magnetic field.

Which of the following is the subustance which neutralizes the excess acid in stomach and raise pH to an appropriate level?

  1. Aantacids

  2. Antihistamines

  3. ranquillizers

  4. Antimicroboals


Correct Option: A
Explanation:

THis option is correct as the subustance which neutralizes excess acid in the stomach and raises pH to an appropriate level is called antacids.

Which of the following exhibits the largest number of oxidation state?

  1. Cr

  2. Sc

  3. Zn

  4. Ni


Correct Option: A
Explanation:

This option is correct as the outer electronic configuration of Cr is 3d54S1, and can exhibit  +1, +2, +3, +4, +5, +6 oxidation states.

Ampicillin is the semi-synthetic modification of

  1. morphine

  2. penicillin

  3. scrotonin

  4. Chlorpheniramine


Correct Option: B
Explanation:

This option is correct as ampicillin is the semi-synthetic modification of penicillin.

Which of the following drug given in the question is Narcotic(addictive) analgesics drug?

  1. Brompheniramine

  2. Aspirin

  3. Morphine(Heroin)

  4. Equanil


Correct Option: C
Explanation:

This is called narcotic analgesics drug and is used for relief of post operative pain, cardiac pain, pain in terminal cancer and child birth.

What is β-lactum antibiotics?

  1. Meprazole and lansopyrazole

  2. Seconal and amytal

  3. Cetrizine and promethazine

  4. Penicillin and cephalosporin


Correct Option: D
Explanation:

These are called β-lactum antibiotics and used for pneumonia, bronchitis etc.

Which of these is not the derivative of tranquillizer barbituric acid?

  1. Luminal

  2. Amytal

  3. Econal

  4. Amoxicillin


Correct Option: D
Explanation:

This option is correct as this is the semi-synthetic modification of penicillin not the derivative of barbituric acid.

4-acetamidophenol is called

  1. aspirin

  2. paracetamol

  3. naproxen

  4. heroin


Correct Option: B
Explanation:

This option is correct as paracetamol is 4-acetamidophenol.

Which of the following drugs is used for reducing fever?

  1. Meprobamate

  2. Barbituric acid

  3. Antipyretic

  4. Aspirin


Correct Option: C
Explanation:

This option is correct as this is non-narcotic drug used for reducing fever.

Aspirin is suppose to be toxic to liver, so which of the following could work as its substitute?

  1. Naproxen

  2. Equanil

  3. Penicillin

  4. Herioin


Correct Option: A
Explanation:

This is used as a substitute of aspirin as aspirin is suppose to be toxic to liver.

0.2% solution of phenol acts as anticeptic whereas 1% solution acts as

  1. antimicrobial

  2. disinfectant

  3. antibiotic

  4. antihistamine


Correct Option: B
Explanation:

This option is correct as 0.2% solution of phenol acts as anticeptic whereas 1% solution acts as disinfectant.

Which of the following is broad spectrum antibiotic?

  1. Penicillin

  2. Equanil

  3. Chloramphenicol

  4. Paracetamol


Correct Option: C
Explanation:

This option is correct as this is a broad spectrum antibiotic.

Dettol and savlon are

  1. anticeptics

  2. antibiotics

  3. disinfectants

  4. antimicrobials


Correct Option: C
Explanation:

This option is correct as dettol and savlon are disinfectants.

Which of the following is used for the sterilization of water to make it fit for drinking purpose?

  1. Dettol

  2. A low concentration of chlorine

  3. Savlon

  4. Iodine


Correct Option: B
Explanation:

This option is correct as a low concentration of chlorine is used for the sterilization of water to make it fit for drinking purpose.

Which of the following compounds contains Frenkel defect?

  1. Diamond

  2. Graphite

  3. Silver chloride

  4. Sodium chloride


Correct Option: C
Explanation:

This option is correct as silver chloride contains Frenkel defect due to the small size of Ag+ ion.

Novestrol is a/an

  1. antifertility drug

  2. anticeptic

  3. antihistamine

  4. neurologically active drug


Correct Option: A
Explanation:

This option is correct as novestrol is an antifertility drug used for the control of child birth.

Barbituric acids and its derivatives such as veronal, luminal and seconal are used for

  1. reducing fever

  2. tuberculosis

  3. hypnotrics

  4. typhoid


Correct Option: C
Explanation:

This option is correct as barbituric acids and its derivatives such as veronal, luminal and seconal are used for hypnotrics.

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