Which statement is true?
1. The electronegative nature of elements increases along the period
2. The electropositive nature of elements increases along the period
3. The chemical reactivity of elements increases along the period
4. The I.E of element decreases along the period
The most non-metallic element among the following is:
1. Be
2. B
3. Mg
4. Al
The screening effect of 'd' electrons is:
1. Much less than s-electrons.
2. Much more than s-electrons.
3. Equal to s-electrons.
4. Equal to p-electrons.
Correct statement regarding transuranic elements is :
1. They have higher atomic number than uranium.
2. They are lighter than uranium.
3. They have lower atomic number than uranium.
4. They have same atomic number as uranium.
The maximum number of valence electrons possible for atoms in the second period of the periodic table is:
1. 18
2. 10
3. 8
4. 2
The element having atomic number 19, is:
1. an inert gas
2. a metal with oxidation number +1
3. a non-metal with oxidation number -3
4. a metal with oxidation number -3
Which of the following has the least density?
1. Na
2. Li
3. Mg
4. K
Eka aluminium and Eka silicon are now known as:
1. | Ga and Ge | 2. | Al and Si |
3. | Fe and S | 4. | H+ and Si |
The order of basic character of given oxides is:
1. Na2O > MgO > Al2O3 > CuO
2. MgO > Al2O3 > CuO > Na2O
3. Al2O3 > MgO > CuO > Na2O
4. CuO > Na2O > MgO > Al2O3
Which of the following exhibits variable oxidation states?
1. | Na | 2. | Cu |
3. | Mg | 4. | Al |