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Daksh sohum
@daksh-sohum
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Joined: Mar 13, 2022
Last seen: May 1, 2022
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Topics: 163 / Replies: 0
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Topic
What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: 29, 59, 74, 95, 102, 104.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 84
Topic
What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 95
Topic
Indicate the steps in the preparation of: (i) K2Cr2O7 from chromite ore. (ii) KMnO4 from pyrolusite ore.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 82
Topic
Give examples and suggest reasons for the following features of the transition metal chemistry: (i)The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 95
Topic
Calculate the number of unpaired electrons in the following gaseous ions: Mn^3+, Cr^3+, V^3+ and Ti^3+. Which one of these is the most stable in aqueous solution?
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 83
Topic
Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 97
Topic
What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqueous solution.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 110
Topic
How would you account for the following: (i) Of the d^4 species, Cr^2+ is strongly reducing while manganese(III) is strongly oxidising.
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 92
Topic
Compare the chemistry of actinoids with that of the lanthanoids with special reference to:
3 years ago
Forum
The d-and f-Block Elements
Replies: 0
Views: 101
Topic
Which one of the following statements is not true? (a) pH of drinking water should be between 5.5 – 9.5. (b) Concentration of DO below 6 ppm is good for the growth of fish.
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 95
Topic
Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air?
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 117
Topic
Which of the following statement(s) is/are true about waste recycling? (i) Clothes can be made from recycled plastic waste.
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 98
Topic
Which of the following practices will not come under green chemistry?
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 90
Topic
Which of the following statements is incorrect? (a) Smoke particulates consist of solid or mixture of solid and liquid particles formed during
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 105
Topic
Which of the following statements are not correct? (i) F^- ion concentration above 2 ppm causes brown mottling in teeth.
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 99
Topic
In almost all Indian metropolitan cities like Delhi, the major atmospheric pollutant(s) is/are
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 81
Topic
Which one of the following pairs is mismatched (a) Fossil fuel burning → release of CO2 (b) Nuclear power → radioactive wastes
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 148
Topic
Which of the following statement(s) is/are correct? (i) Classical smog is a mixture of smoke, fog and sulphur dioxide. (ii) Classical smog is also called oxidising smog
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 85
Topic
Lichens do not like to grow in cities (a) because of absence of the right type of algae and fungi
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 102
Topic
Which among the following statements is false? (a) Oil slick in sea water increases D.O. value (b) The main reason for river water pollution is industrial and domestic sewage discharge
3 years ago
Forum
Environmental Issues
Replies: 0
Views: 104
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