Physical Properties (Group 1)
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Q. A physical quantity d is related to physical quantities a, b and c as d=a√bc3 . 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√bc3 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
एक भौतिक राशि d भौतिक राशियों a, b तथा c से d=a√bc3 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
- 3.5%
- 2.75%
- 2%
- 1.25%
Q. Which of the following silver salt is insoluble in water?
- AgF
- AgClO4
- AgNO3
- Ag2SO4
Q. Lithium fluoride has the highest solubility of the group IA metal halides.
- True
- False
Q. The atomic radii of the group IA elements as we go down the group.
- remains constant
- decrease
- increases
Q. Identify the correct order of acidic strengths of CO2, CuO, CaO and
H2O
H2O
Q. As we go along the period the atomic size decreases.
- True
- False
Q. Why do the topmost elements (II period elements) show anomalous properties?
- They are small in size
- They do not possess d-orbitals
- They have high ionization energy, and high electronegativity.
- Abundance of those elements in the Earth's crust is high.
Q. The metallic lustre of sodium is explained by the presence of:
- Inert gas configuration
- Na+ ions
- BCC lattice
- The oscillation of loosely bound electrons
Q. Crude common salt becomes damp when kept open in air because:
- None
- NaCl is hygroscopic in nature
- It contains MgCl2 and CaCl2 as impurities which are deliquescent in nature
- (a) and (b) both
Q. Element Hg has two oxidation states Hg1+ & Hg2+, the correct order of radii of these ions?
- Hg+1<Hg2+
- Hg1+>Hg2+
- Hg1+=Hg2+
- Hg1+≤Hg2+