Questions
41
Which of the following is the molecular formula of cyclobutane?
Answer: C4H8
42
The property of self-linkage among identical atoms to form long chain compounds is known as:
Answer: Catenation
45
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:
Answer: The fuel is not burning completely
46
An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?
Answer: 1
47
Which of the following does not decrease while moving down the group of the periodic table?
Answer: Valence electrons
48
The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds?
Answer: B and C
49
Which of the following is the atomic number of an element that forms basic oxide?
Answer: 19
50
Which of the following elements has 2 shells and both are completely filled?
Answer: Neon
51
Which group elements are called transition metals?
Answer: Group number 3 to 12
52
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
Answer: Mg
53
Which of the following is the most reactive element of the group 17?
Answer: Fluorine
55
Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?
Answer: F < O < N
56
What happens to the electropositive character of elements on moving from left to right in a periodic table?
Answer: Decreases
57
Which of the following forms the basis of the modern periodic table?
Answer: Atomic number
58
How many periods and groups are present in the periodic table?
Answer: 7 periods and 18 groups
59
Arteries and veins are connected by a network of extremely narrow tubes called:
Answer: Capillaries
60
Which among the following is necessary to carry out the blood coagulation in a cut or wound?
Answer: Platelets
