1
IIT-JEE 1992
Subjective
+4
-0
One gram of commercial AgNO3 is dissolved in 50 ml. of water. It is treated with 50 ml. of a KI solution. The silver iodide thus precipitated is filtered off. Excess of KI in the filterate is titrated with (M/10) KIO3 solution in presence of 6M HCl till all I- ions are converted into ICl. It requires 50 ml. of (M/10) KIO3 solution. 20 ml. of the same stock solution of KI requires 30 ml. of (M/10) KIO3 under similar conditions. Calculate the percentage of AgNO3 in the sample.
(Reaction : KIO3 + 2KI + 6HCl $$\to$$ 3ICl + 3KCl + 3H2O)
2
IIT-JEE 1992
MCQ (Single Correct Answer)
+1
-0.25
Which of the following relates to photons both as wave motion and as a stream of particles?
A
Inference
B
E = mc2
C
Diffraction
D
E = hv
3
IIT-JEE 1992
MCQ (Single Correct Answer)
+1
-0.25
Which of the following does not characterise X-rays?
A
The radiation can ionise gases
B
It causes ZnS to fluorescence
C
Deflected by electric and magnetic fields
D
Have wavelengths shorter than ultraviolet rays
4
IIT-JEE 1992
MCQ (Single Correct Answer)
+1
-0.25
The statement that is not correct for the periodic classification of element is
A
The properties of elements are the periodic functions of their atomic numbers
B
Non-metallic elements are lesser in number than metallic elements
C
The first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
D
For transition elements the d-subshells are filled with electrons monotonically with increase in atomic number.
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