1
###
Which presents the correct sequence of the increasing basic nature

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

- MgO < K
_{2}O < Al_{2}O_{3}< Na_{2}O - K
_{2}O < Na_{2}O < Al_{2}O_{3}< MgO - Na
_{2}O < K_{2}O < MgO < Al_{2}O_{3} - Al
_{2}O_{3}< MgO < Na_{2}O < K_{2}O

2
###
According to the periodic law of elements, the variation in properties

According to the periodic law of elements, the variation in properties of elements is related to their

- atomic masses
- atomic numbers
- nuclear masses
- nuclear neutron-proton number ratios

3
###
The set representing the correct order of ionic radius is

The set representing the correct order of ionic radius is

- Li
^{+}> Na^{+}> Mg^{2+}> Be^{2+} - Na
^{+}> Li^{+}> Mg^{2+}> Be^{2+} - Li
^{+}> Be^{2+}> Na^{+}> Mg^{2+} - Mg
^{2+}> Be^{2+}> Li^{+}> Na^{+}

4
###
The ionic radii (in Å) of N3–, O2– and F– are respectively

The ionic radii (in Å) of N^{3–}, O^{2–} and F^{–} are respectively

- 1.36, 1.71 and 1.40
- 1.71, 1.40 and 1.36
- 1.71, 1.36 and 1.40
- 1.36, 1.40 and 1.71

5
###
Which one of the following ions has the highest value of ionic radius

Which one of the following ions has the highest value of ionic radius?

- Li
^{+} - F
^{–} - O
^{2–} - B
^{3+}

6
###
The increasing order of the first ionisation enthalpies of the elements B, P, S and F

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

- B < P < S < F
- F < S < P < B
- P < S < B < F
- B < S < P < F

Consider the graph in which the birthrate and death rate of a country
Which frequency range is sensitive to human ears
log12 81 = p, then 3[(4-p)/(4+p)] is equal to
A right circular cone, of height 12 ft, stands on its base
Points E, F, G, H lie on the sides AB, BC, CD, and DA
While multiplying three real numbers, Ashok took one of the numbers
If x is a positive quantity such that 2x = 3^log5 2, then x is equal to
If u^2 + (u − 2v − 1)^2 = −4v(u + v), then what is the value of u + 3v