Chemistry Test

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Chemistry Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is an example of Baeyer-Villiger rearrangement?

A

B

C

D

Solution

The treatment of ketones with peracids (RCOOOH) or hydrogen peroxide gives esters by insertion of oxygen. The reaction is called Baeyer-Villiger rearrangement or Baeyer-Villiger oxidation.
Question 2
4 / -1

All noble gases have general electronic configuration ns²np⁶ except helium which has 1s² because__________________.

A
helium atom has two electrons in its valence shell

B
helium atom doesn't have any electrons in its valence shell

C
helium atom has one electrons in its valence shell

D
none of these

Solution

All noble gases have general electronic configuration ns²np⁶ except helium which has 1s² because helium atom has two electrons in its valence shell thereby completing duplet configuration, as a result, valency is zero.
Question 3
4 / -1

The mineral containing both magnesium and calcium is:

A
magnesite

B
calcite

C
carnallite

D
dolomite
Solution
The mineral containing both magnesium and calcium is Dolomite.
- Dolomite is used as a source of magnesium metal and of magnesia (MgO), which is a constituent of refractory bricks.
- Dolostone is often used instead of limestone as an aggregate for both cement and bitumen mixes and also as a flux in blast furnaces.
- Dolomite is used as an ornamental stone, a concrete aggregate, and a source of magnesium oxide, as well as in the Pidgeon process for the production of magnesium.
- The "dolomite problem" refers to the vast worldwide depositions of dolomite in the past geologic record eluding a unified explanation for their formation.
Question 4
4 / -1

One of the most widely used drugs in medicine iodex is:

A
Methyl salicylate

B
Ethyl salicylate

C
Acetyl salicylic acid

D
O-hydroxy benzoic acid

Solution

Methyl salicylate is an external analgesic available in over-the-counter (OTC) medicines that temporarily relieve minor body aches and muscle and joint pain associated with backache, arthritis, strains, sprains, and bruises.
Question 5
4 / -1

Which is the shape of sulfur hexafluoride molecule?

A
Triangular pyramid

B
Octahedral

C
Planar

D
Tetrahedral
Solution
Sulfur hexafluoride (SF₆) is an Associate in Nursing inorganic, gas. it’s non-flammable, odorless, and colorless.
- It’s a hypervalent octahedral molecule that has been a noteworthy topic of voice communication among chemistry enthusiasts.
- Henri Moissan discovered the existence of SF₆.
- Sulfur hexafluoride is a very dense gas so it will mainly reside in the lowest layers of air.
- Exposure will be primarily occupational. Sulfur hexafluoride is a weaker eluent than carbon dioxide and difficult to obtain inadequate purity.
Question 6
4 / -1

The Vividh Bharati station of All India Radio, Delhi, broadcasts on a frequency of 1368 kHz. Calculate the wavelength of the electromagnetic radiation emitted by transmitter.

A
319.3 m

B
219.3 m

C
200 m

D
220.3 m

Solution
Question 7
4 / -1

Which of the following compound on heating does not produce metal oxide?

A

B

C

D

Solution
Question 8
4 / -1

Which of the following contains the same number of atoms as 20g of calcium Ca ?

A
24g of Mg

B
8g of Oxygen -atoms

C
12 g of Carbon

D
16 g of Oxygen -atoms

Solution
Question 9
4 / -1

Identify the product A in the following reaction:

A

B

C

D

Solution
Question 10
4 / -1

Which of the following is an unsaturated compound?

A

B

C

D

Solution

Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms.

The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting of all single bonds).

The example of the unsaturated compound is alkenes and alkynes, as well as branched chains and aromatic compounds.