Physical Properties (Group 1)

Q. A physical quantity d is related to physical quantities a, b and c as $d=a\sqrt{\frac{b}{c^3}}$ . If maximum permissible percentage error in a, b and c is 1.5%, 1% and 0.5% respectively. The maximum percentage error in the calculation of quantity d is
एक भौतिक राशि d भौतिक राशियों a, b तथा c से $d=a\sqrt{\frac{b}{c^3}}$ के अनुसार सम्बन्धित है। यदि a, b तथा c में अधिकतम अनुमेय प्रतिशत त्रुटि क्रमशः 1.5%, 1% तथा 0.5% हैं। राशि d की गणना में अधिकतम प्रतिशत त्रुटि है

1. 3.5%
2. 2.75%
3. 2%
4. 1.25%

Q. Which of the following silver salt is insoluble in water?

1. $AgF$
2. $AgCl{O}_4$
3. $AgN{O}_3$
4. $A{g}_{2}S{O}_4$

Q. Lithium fluoride has the highest solubility of the group IA metal halides.

1. True
2. False

Q. The atomic radii of the group IA elements as we go down the group.

1. remains constant
2. decrease
3. increases

Q. Identify the correct order of acidic strengths of $C{O}_2,CuO,CaO$ and
$H_{2}O$

1. 
2. 
3. 
4. 

Q. As we go along the period the atomic size decreases.

1. True
2. False

Q. Why do the topmost elements (II period elements) show anomalous properties?

1. They are small in size
2. They do not possess d-orbitals
3. They have high ionization energy, and high electronegativity.
4. Abundance of those elements in the Earth's crust is high.

Q. The metallic lustre of sodium is explained by the presence of:

1. Inert gas configuration
2. $N{a}^{+}$ ions
3. BCC lattice
4. The oscillation of loosely bound electrons

Q. Crude common salt becomes damp when kept open in air because:

1. None
2. $NaCl$ is hygroscopic in nature
3. It contains $MgC{l}_2$ and $CaC{l}_2$ as impurities which are deliquescent in nature
4. (a) and (b) both

Q. Element $Hg$ has two oxidation states $H{g}^{1+}$ & $H{g}^{2+}$, the correct order of radii of these ions?

1. $H{g}^{+1}<H{g}^{2+}$
2. $H{g}^{1+}>H{g}^{2+}$
3. $H{g}^{1+}=H{g}^{2+}$
4. $H{g}^{1+}\le H{g}^{2+}$