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Jaiyush19
Jaiyush19
@jaiyush19
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Joined: Sep 10, 2021
Last seen: Jul 13, 2023
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Topics: 2159 / Replies: 16
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Topic
Which one pair of the following parents is most likely to get a child who suffers from hemolytic disease of new born?
4 years ago
Forum
Biology
Replies: 0
Views: 76
Topic
Which character studied by Mendel in garden pea (Pisum sativum) was dominant
4 years ago
Forum
Biology
Replies: 0
Views: 74
Topic
Which of the following is the main category of mutation?
4 years ago
Forum
Biology
Replies: 0
Views: 79
Topic
In hybridisation Tt × tt gives rise to the progeny of ratio (1) 2 :1 (2) 1: 1 (3) 1: 2: 1 (4) 1 :2
4 years ago
Forum
Biology
Replies: 0
Views: 51
Topic
Phenomenon of ‘Industrial melanism’ demonstrates (1) geographical isolation (2) natural selection (3) reproductive isolation (4) induced mutation
4 years ago
Forum
Biology
Replies: 0
Views: 69
Topic
One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following information is most appropriate?
4 years ago
Forum
Biology
Replies: 0
Views: 96
Topic
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong? (b) The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 152
Topic
An element Y is in second period and group 16 of the periodic table: (i) Is it a metal or non-metal? (ii) What is the number of valence electrons in its atom?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 138
Topic
An element X is in group 2 of the periodic table: (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 124
Topic
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here are not the chemical symbols of the elements):
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 128
Topic
An element X belongs to 3rd period and group 2 of the periodic table. State: (a) number of valence electrons (b) valency (c) metal or non-metal (d) name of the element
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 132
Topic
The atomic numbers of three elements A, B and C are given below: Element Atomic number A - 5 B - 7 C - 10 (i) Which element belongs to group 18? (ii) Which element belongs to group 15?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 109
Topic
In each of the following pairs, choose the atom having the bigger size: (a) Mg (At. No.12) or Cl (At. No. 17) (b) Na (At. No. 11) or K (At. No. 19)
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 99
Topic
Consider the following elements : 20Ca, 8O, 18Ar, 16S, 4Be, 2He Which of the above elements would you expect to be: (i) very stable? (ii) in group 2 of the periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 117
Topic
An atom has an electron structure of 2, 7. (a) What is the atomic number of this atom? (b) To which of the following would it be chemically similar? 7N, 15P, 17Cl, is Ar (c) Why would you expect it to be similar?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 69
Topic
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 137
Topic
What is a group in the periodic table? In which part of a group would you separately expect the elements to have (i) the greatest metallic character (ii) the largest atomic size?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 120
Topic
Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements. (b) Why do elements in the same group show similar properties but the elements in different groups show different properties?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 120
Topic
What are the periods and groups in a periodic table? Give two characteristics of each. (b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 91
Topic
In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71? (b) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table?
4 years ago
Forum
Periodic Classification Of Elements
Replies: 0
Views: 97
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