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Chemistry MCQs | Objective Type Questions | MCQs SET-1
1.An amalgam of metal has which other element?
Correct Answer: D [Hg]
Notes:
An amalgam is an alloy of mercury with another metal. Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum. Silver-mercury amalgams are important in dentistry, and gold-mercury amalgam is used in the extraction of gold from ore.
An amalgam is an alloy of mercury with another metal. Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum. Silver-mercury amalgams are important in dentistry, and gold-mercury amalgam is used in the extraction of gold from ore.
2.Rock Salt contains which mineral?
Correct Answer: B [Sodium]
Notes:
Rock salt is the mineral (natural) form of sodium chloride (NaCl). It has high quantities of phosphorous, calcium, potassium, iron, magnesium, zinc, selenium, copper, bromine, zirconium and iodine. All of these minerals occur naturally.
Rock salt is the mineral (natural) form of sodium chloride (NaCl). It has high quantities of phosphorous, calcium, potassium, iron, magnesium, zinc, selenium, copper, bromine, zirconium and iodine. All of these minerals occur naturally.
3.Which mineral is popularly known as ‘buried sunshine’?
Correct Answer: D [Coal]
Notes:
Coal is often called the “buried sunshine” because it developed from the remains of plants and greens that existed as long as 400 million years ago.
Coal is often called the “buried sunshine” because it developed from the remains of plants and greens that existed as long as 400 million years ago.
- Most of coal was formed 300 million years ago, when much of Earth was covered in “steamy swamps.”
- As these greens died, they fell to the bottom of the floor, forming peat.
- The coalification process (transformation into coal) begins when the peat is physically and chemically altered.
4.The chemical name of rat poison is:
Correct Answer: D [zinc phosphide]
Notes:
Zinc phosphide is used as a rodenticide. A mixture of food and zinc phosphide is left where the rodents can eat it. The acid in the digestive system of the rodent reacts with the phosphide to generate the toxic phosphine gas.
Zinc phosphide is used as a rodenticide. A mixture of food and zinc phosphide is left where the rodents can eat it. The acid in the digestive system of the rodent reacts with the phosphide to generate the toxic phosphine gas.
45.Water cycle refers to:
Correct Answer: B [constant movement of water from ocean to land and back to ocean once again]
Notes:
Constant movement of water from ocean to land and back to ocean once again. During cycle water passes through the different phases.
Constant movement of water from ocean to land and back to ocean once again. During cycle water passes through the different phases.
6.Vinegar made by fermentation from cane sugar contains:
Correct Answer: D [acetic acid]
Notes:
Vinegar is a liquid substance consisting mainly of acetic acid (CH3CO2H) and water. The acetic acid being produced through the fermentation of ethanol by acetic acid bacteria. It is mainly used in the kitchen as a general cooking ingredient, but historically, as the most easily available mild acid, it had a great variety of industrial, medical, and domestic uses, some of which (such as a general household cleanser) are still promoted today.
Vinegar is a liquid substance consisting mainly of acetic acid (CH3CO2H) and water. The acetic acid being produced through the fermentation of ethanol by acetic acid bacteria. It is mainly used in the kitchen as a general cooking ingredient, but historically, as the most easily available mild acid, it had a great variety of industrial, medical, and domestic uses, some of which (such as a general household cleanser) are still promoted today.
- CH3CH2OH —(o)> CH3CHO —(o)> CH3COOH
7.The main source of Naphthalene is:
Correct Answer: C [Coal-tar]
Notes:
The main source of Naphthalene is coal-tar. Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flamable liquid hydrocarbon mixture, including coal-tar.
The main source of Naphthalene is coal-tar. Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flamable liquid hydrocarbon mixture, including coal-tar.
8.The quality of petrol is expressed in terms of:
Correct Answer: C [Octane number]
Notes:
Octane rating or octane number is a standard measure of the ignition quality of gas (gasoline or petrol). Higher this number, the less susceptible is the gas to ‘knocking’ (explosion caused by its premature burning in the combustion chamber) when burnt in a standard (spark-ignition internal combustion) engine.
Octane rating or octane number is a standard measure of the ignition quality of gas (gasoline or petrol). Higher this number, the less susceptible is the gas to ‘knocking’ (explosion caused by its premature burning in the combustion chamber) when burnt in a standard (spark-ignition internal combustion) engine.
9.Which of the following is also known as Carbolic Acid?
Correct Answer: A [Phenol]
Notes:
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. The molecule consists of a phenyl group (–C6H5) bonded to a hydroxyl group (–OH). It is primarily used to synthesize plastics and related materials.
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. The molecule consists of a phenyl group (–C6H5) bonded to a hydroxyl group (–OH). It is primarily used to synthesize plastics and related materials.
10.Which of the following acid found in Apple?
Correct Answer: A [Malic Acid]
Notes:
Malic acid is a naturally occurring substance found in many fruits and vegetables, and is largely responsible for the sour taste found in apples and pears. Malic acid was first isolated from apple juice by Carl Wilhelm Scheele in 1785.
Malic acid is a naturally occurring substance found in many fruits and vegetables, and is largely responsible for the sour taste found in apples and pears. Malic acid was first isolated from apple juice by Carl Wilhelm Scheele in 1785.
