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MCQ on Proteins and Amino Acids for Students
Composition of Tollen’s Reagent
1. Ammonical Silver Nitrate
2. Ammonical Silver hydroxide
3. Ammonical Silver chloride
4. Ammonical Silver Bromide
Option 1 – Ammonical Silver Nitrate
Hexoses Contain
1. 3 Carbons
2. 4 Carbons
3. 5 Carbons
4. 6 Carbons
Option 4 – 6 Carbons
In Which test silver mirror is formed on the walls of the test tube
1. Tollen’s test
2. Benedict’s test
3. Shieff’s test
4. Fehlling’s test
Option 1 – Tollen’s test
Benedict’s solution contains
1. Silver nitrate
2. Zinc Sulphate
3. Copper Sulphate
4. Magnesium Nitrate
Option 3 – Copper Sulphate
In the Benedict’s test glucose gives
1. Red precipitate
2. Yellow precipitate
3. Orange precipitate
4. Brown precipitate
Option 1 – Red precipitate
Which of the following gives Tollen’s test and Benedict’s test?
1. glucose
2. fructose
3. sucrose
4. none of these
Option 1 – glucose
Sucrose on hydrolysis gives rise to
1. glucose
2. fructose
3. both (1) and (2)
4. none of these
Option 3 – both (1) and (2)
The colour of the precipitate formed when a reducing sugar is heated with Benedict’s solution is
1. Brown
2. Red
3. Green
4. Blue
Option 2 – Red
In the Iodine test in identifying Starch the Starch Solution turns into
1. Red
2. Green
3. Pink
4. Blue
Option 4 – Blue
Cellulose is a
1. protein
2. simple sugar
3. carbohydrate
4. all the above
Option 3 – carbohydrate
Glucose gives silver mirror test with tollen’s reagent It shows the presence of
1. Acidic group
2. Alcoholic group
3. Ketonic group
4. Aldehydic group
Option 4 – Aldehydic group
Iodine forms a blue complex with
1. Starch
2. Glucose
3. Cellulose
4. Fructose
Option 1 – Starch
Sugar-cane grows to a height of …..
1. 5 metres
2. 3 to 5 metres
3. 10 metres
4. 6 to 8 metres
Option 2 – 3 to 5 metres
Sugar-cane contains ……. of sucrose by weight
1. 5-10%
2. 10-20
3. 11-15%
4. 15-20%
Option 3 – 11-15%
Spent cane is
1. Wash
2. Pressmud
3. Molasses
4. Bagasse
Option 4 – Bagasse
Which of the following gives Tollen’s llen’s test and Benedict’s test?
1 . glucose
2. sucrose
3. starch
4. all the above
Option 1 – glucose
Photosynthesis occur in presence of
1. Sun light
2. Moon light
3. Darkness
4. None of these
Option 1 – Sun light
Which form of Carbohydrate present in grains
1. Glucose
2. Sugar
3. Starch
4. All the above
Option 4 – All the above
Which form of Carbohydrate is present in cotton
1. Glucose
2. Fructose
3. Sucrose
4. Cellulose
Option 4 – Cellulose
All the Carbohydrates in the living body are finally converted into
1. fructose
2. glucose
3. mannose
4. sucrose
Option 2 – glucose
Glucose in the living bodies is broken down into….. and ……. to liberate energy in the cell
1. water
2. carbon dioxide
3. (1) and (2)
4. None of these
Option 3 – (1) and (2)
Calorific Value of Glucose is :
1. 3.81 Cal/gram
2. 686 Cal/mole
3. Both of these
4. None of these
Option 4 – None of these
The human stomach produces acid ‘X’ which helps in the digestion of food. Acid ‘X’ is
(a) acetic acid
(b) methanoic acid
(c) hydrochloric acid
(d) citric acid
Option c – hydrochloric acid
Sometimes, indigestion is caused by the secretion of too much hydrochloric acid in the stomach. To ease the pain caused, a tablet can be taken that reacts to reduce the amount of acid present. Which one among the following would be inappropriate for a manufacturer to include as a major reactant in the tablet?
(a) CaCO3
(b) MgCO3
(c) NaOH
(d) Mg(OH)2
Option c – NaOH
Which one among the following is the equivalent weight of sulphuric acid? (Atomic weight : H = 1, S = 32, O =16)
(a) 98
(b) 60
(c) 100
(d) 49
Option d – 49
Hydrofluoric acid is not kept in glass bottles because it reacts with
(a) visible light
(b) sodium oxide of glass
(c) aluminum oxide of glass
(d) silicon dioxide in glass
Option c – aluminum oxide of glass
Which calcium compound does not increase the pH of acidic soils?
(a) Calcium carbonate
(b) Calcium hydroxide
(c) Calcium oxide
(d) Calcium sulphate
Option d – Calcium sulphate
The same acid solution is taken in two test tubes. Zinc is introduced in the first test tube and magnesium in the second. A gas is evolved in the second test tube which burns with a pop sound while no gas is evolved from the first. Identify the acid solution taken in the two test tubes.
(a) HCI
(b) HNO3
(c) H₂SO4
(d) H3PO4
Option b – HNO3
Which of the following represents the correct order of the acidic strength for equimolar aqueous solutions of HCl, H2SO4, NH4OH, and NaOH
(a) HCI <NH4OH < NaOH <H₂SO4
(b) NH4OH <NaOH <H₂SO4 <HCI
(c) HCI<H2SO4 <NH4OH< NaOH
(d) NaOH <NH4OH<HCI <H₂SO4
Option d – NaOH
Which one of the following acids is used for etching glass?
(a) H₂SO4
(b) HNO3
(c) HF
(d) HCI
Option c – HF
Iodized salt contains
(a) Free iodine
(b) Calcium iodine
(c) Magnesium iodine
(d) Potassium Iodine
Option d – Potassium Iodine
Sodium stearate is a salt and is used
(a) in gunpowder
(b) in paint
(c) to make soap
(d) to make fertilizer
Option c – to make soap
Vinegar is an aqueous solution of
(a) Oxalic acid
(b) Citric acid
(c) Hydrochloric acid
(d) Acetic acid
Option d – Acetic acid
Which of the following acids does not contain oxygen?
(a) Nitric acid
(b) Sulphuric acid
(c) Hydrochloric acid
(d) All of the above
Option c – Hydrochloric acid
Which of the following statement is wrong about sodium hydroxide?
(a) It is a deliquescent substance
(b) It is corrosive
(c) It dissolves ferric oxide
(d) It releases hydrogen gas with aluminum
Option c – It dissolves ferric oxide
Which of the following can dissolve limestone?
(a) NH3 + H2O
(b) NaOH + H₂O
(c) CaO + H2O
(d) CO₂ + H₂O
Option d – CO₂ + H₂O
Chemical ‘A’ is used for water softening to remove temporary hardness. ‘A’ reacts with sodium carbonate to generate caustic soda. What is ‘A’?
(a) Gypsum
(b) Slaked lime
(c) Quick lime
(d) Limestone
Option b – Slaked lime
Which of the following solution has the lowest pH value?
(a) 0.1 Molar NaCl solution
(b) 0.01 Molar NaHCO3 solution
(c) 0.001 Molar Na2CO3 solution
(d) 0.01 Molar NaOH solution
Option a – 0.1 Molar NaCl solution
A boy touches the leaves of a nettle plant and feels a burning pain. What is the reason?
(a) A layer of sulphuric acid is present on the leaves of the nettle plants.
(b) A layer of acidic salts is present on its hair around the nettle leaf.
(c) The stinging hair of the plant injects methanoic acid.
(d) The stinging hair of the plant injects magnesium hydroxide.
Option c – The stinging hair of the plant injects methanoic acid
The acidic soil which is not good for the healthy growth of plants is neutralized by
(a) ammonium hydroxide (NH4OH)
(b) calcium oxide (CaO)
(c) sodium hydroxide (NaOH)
(d) magnesium hydroxide (Mg (OH)2
Option b – calcium oxide (CaO)
Presence of which of the following acid causes indigestion :
(a) Citric acid
(b) Oxalic acid
(c) Acetic acid
(d) Hydrochloric acid.
Option d – Hydrochloric acid
Which of the following gives the correct increasing order of acidic strength?
(a) Water < Acetic acid <Hydrochloric acid
(b) Water <Hydrochloric acid <Acetic acid
(c) Acetic acid < Water <Hydrochloric acid
(d) Hydrochloric acid <Water <Acetic acid
Option a – Water
FeO is
1. Acidic
2. Basic
3. Amphoteric
4. Neutral
Option 2 – Basic
pH of solution is independent of
1. Temperature
2. Its concentration
3. Degree of ionization
4. Amount of solution
Option 4 – Amount of solution
pH of 0.001 M HCI is
1. 1
2. 2
3. 3
4. 4
Option 3 – 3
pH of acids is between
1. 0 and 7
2.0 and 14
3.7 and 14
4. None of these
Option 1 – 0 and 7
pH of bases is between
1.0 and 6
2.8 and 14
3.0 and 14
4. 7 and 14
Option 4 – 7 and 14
The pH of gastric juice is
1. 1 to 2
2. 2 to 4
3. 5.5
4. 7.32 to 7.45
Option 1 – 1 to 2
The pH of Lemon juice is
1. 1
2. 4
3. 5.5
4. 6.9
Option 2 – 4
The pH of urine is
1. 2 to 4
2. 4.8 to 7.5
3. 7.32 to 7.45
4. 4.5 to 9.5
Option 2 – 4.8 to 7.5
The pH of saliva is
1. 1.5 to 2.5
2. 7.32 to 7.45
3. 6.4 to 6.9
4. 7
Option 3 – 6.4 to 6.9
The pH of pure water is
1. 0
2. 1
3. 7
4. 14
Option 3 – 7
The pH of blood is
1. 1.5 to 3.5
2. 5.5 to 7.5
3. 7.25 to 8.75
4. 7.32 to 7.45
Option 4 – 7.32 to 7.45
The fluids whose pH is less than 7 are
1. Acidic
2. Basic
3. Amphoteric
4. Neutral
Option 1 – Acidic
The fluids whose pH is greater than 7 are
1. Acidic
2. Alkaline
3. Amphoteric
4. Neutral
Option 2 – Alkaline
The body fluid whose pH is greater than 7 is
1. Gastric juice
2. Urine
3. Saliva
4. Blood
Option 4 – Blood
pH of 0.1M HCI is
1. 1
2. 7
3. 3.65
4. 14
Option 1 – 1
Pure water is a
1. Conductor
2. Best conductor
3. Super conductor
4. Poor conductor
Option 4 – Poor conductor
We covered all the MCQ on proteins and amino acids above in this post for free so that you can practice well for the exam.
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