Multiple choice

Which of the following statement(s) is/are false?

P. Gallium has higher melting and boiling point than indium. Q. Tusionite is the mineral of boron. R. Gallium arsenide is used in the making of tunnel diodes for FM transmitter circuits.

  1. P only

  2. Q only

  3. R only

  4. P and Q

  5. Q and R
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

P. The melting and boiling points of gallium are 29.8oC and 2204oC whereas the melting and boiling points of indium are 156oC and 2072oC respectively.

Q. Tusionite is a rare colourless to transparent to translucent yellow brown trigonal borate mineral with chemical formula-MnSn(BO3)2. The mineral is composed of 18.86% manganese, 40.76% tin, 7.42% boron, and 32.96% oxygen.

R. Gallium and its derivatives have only found applications in recent decades. Gallium arsenide has been used in semiconductors, in amplifiers, in solar cells (for example in satellites) and in the manufacturing of tunnel diodes for FM transmitter circuits.

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