Forum

Jaiyush19
Jaiyush19
@jaiyush19
Forum Home   |   Recent Posts
Illustrious Member
Joined: Sep 10, 2021
Last seen: Jul 13, 2023
Profile Activity
Topics: 2159 / Replies: 16
AllTopicsReplies
Topic
State one example of a Dobereiner’s triad, showing in it that the atomic mass of middle element is half-way between those of the other two.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 77
Topic
Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 242
Topic
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium, and eka-silicon. What names were given to these elements when they were discovered later on?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 292
Topic
Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 173
Topic
In the classification of the then known elements, Mendeleev was guided by two factors. What are those two factors?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 184
Topic
What was Mendeleev’s basis for the classification of elements?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 246
Topic
X and Y are the two elements having similar properties which obey Newlands’ law of octaves. How many elements are there in between X and Y?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 282
Topic
A, B and C are the elements of Dobereiner’s triad. If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 197
Topic
Name the scientists who gave the following laws in the early classification of elements: (a) Law of octaves (b) Law of triads
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 296
Topic
Rewrite the following statements after correction, if necessary: (a) Groups have elements with consecutive atomic numbers. (b) Periods are the horizontal rows of elements. (c) Isotopes are the elements of the same group.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 213
Topic
Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 205
Topic
State whether the following statements are true or false: (a) Newlands divided the elements into horizontal rows of eight elements each. (b) According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic n.....
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 157
Topic
(a) On what basis did Mendeleev arrange the elements in his periodic table? (b) On what basis are they arranged now?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 265
Topic
Four carbon atoms containing neutral organic compound X reacts with sodium metal to evolve a gas which burns with a ‘pop’ sound. Another four carbon atoms containing carbon compound react with sodium hydrogen carbonate to evolve a gas which turns lim...
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 175
Topic
Which of the following hydrocarbons can decolourise bromine water and which cannot? Why? C6H12, C6H14, C6H10
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 269
Topic
An organic compound A (molecular formula C2H4O2) reacts with Na metal to form compound B and evolves a gas which burns with a pop sound. Compound A on treatment with an alcohol C in the presence of a little of concentrated sulphuric acid forms a swee...
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 338
Topic
An organic compound A having the molecular formula C3H8O is a liquid at room temperature. The organic liquid A reacts with sodium metal to evolve a gas which burns causing a little explosion.
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 313
Topic
An organic acid X is a liquid, Which often freezes during winter time in cold countries, having the molecular formula C2H4O2. On warming it with methanol in the presence of a few drops of concentrated sulphuric acid, a compound Y with a sweet smell i...
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 254
Topic
Consider the following organic compounds: CH3OH, C2H5OH, CH3COCH3, CH3COOH, C2H5COOH, C4H9COOC2H5, CH4, C2H6, CH3CHO, HCHO Out of these compounds : (a) Which compound is most likely to be sweet-smelling?
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 287
Topic
The structural formula of an ester is: Write the formula of the acid and the alcohol from which it is formed.
4 years ago
Forum
Carbon and Its Compounds
Replies: 0
Views: 163
Page 20 / 109

How Can We Help?

    Home

    About Us

    Contact Us

    Privacy Policy

    Term of Use

    Copyright © 2020 Eanshub

    All Rights Reserved