A mixture of iron filings and sulphur has been provided to a student. He divides the mixture into two parts and labelled it as A and B. Mixture B was subjected to heating
i.) State the type of change observed after heating the mixture B.
ii.)How does Mixture A and B behaves towards: a magnet, Carbon disulphide and dil. hydrochloric acid
Answers
Answer:
Coronaviruses are a group of RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal. Mild illnesses in humans include some cases of the common cold (which is also caused by other viruses, predominantly rhinoviruses), while more lethal varieties can cause SARS, MERS, and COVID-19. In cows and pigs they cause diarrhea, while in mice they cause hepatitis and encephalomyelitis. There are as yet no vaccines or antiviral drugs to prevent or treat human coronavirus infections.
Orthocoronavirinae
Coronaviruses 004 lores.jpg
Transmission electron micrograph of Avian coronavirus
Illustration of a SARS-CoV-2 virion
Illustration of a SARS-CoV-2 virion[2]
Red: spike proteins (S)
Grey: lipid bilayer envelope
Yellow: envelope proteins (E)
Orange: membrane proteins (M)
Virus classificatione
(unranked):
Virus
Realm:
Riboviria
Kingdom:
Orthornavirae
Phylum:
Pisuviricota
Class:
Pisoniviricetes
Order:
Nidovirales
Family:
Coronaviridae
Subfamily:
Orthocoronavirinae
Genera[1]
Alphacoronavirus
Betacoronavirus
Gammacoronavirus
Deltacoronavirus
Synonyms[3][4]
Coronavirinae
Coronaviruses constitute the subfamily Orthocoronavirinae, in the family Coronaviridae, order Nidovirales, and realm Riboviria.[5][4] They are enveloped viruses with a positive-sense single-stranded RNA genome and a nucleocapsid of helical symmetry.[6] The genome size of coronaviruses ranges from approximately 26 to 32 kilobases, one of the largest among RNA viruses.[7] They have characteristic club-shaped spikes that project from their surface, which in electron micrographs create an image reminiscent of the solar corona, from which their name derives.[8]
Etymology
The name "coronavirus" is derived from Latin corona, meaning "crown" or "wreath", itself a borrowing from Greek κορώνη korṓnē, "garland, wreath".[9][10] The name was coined by June Almeida and David Tyrrell who first observed and studied human coronaviruses.[11] The word was first used in print in 1968 by an informal group of virologists in the journal Nature to designate the new family of viruses.[8] The name refers to the characteristic appearance of virions (the infective form of the virus) by electron microscopy, which have a fringe of large, bulbous surface projections creating an image reminiscent of the solar corona or halo.[8][11] This morphology is