An atom of an element X gains two electrons. The symbol of the ion formed is
X +
X 2+
X 2-
X -
Correct answer is C
X gained two electrons. X = 2-.
The ion formed is X\(^{2-}\).
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
M2Y3
M3Y2
MY
M3Y
Correct answer is A
M is a trivalent metal i.e M = 3+ ; Y is a divalent non-metal i.e Y = 2-
A reaction between M and Y will yield M\(_2\)Y\(_3\).
The molecule which has a linear shape is
CH4
NH3
H2S
CO2
Correct answer is D
The shapes of the molecules are:
CH\(_4\) - Tetrahedral; NH\(_3\) - Trigonal pyramidal; H\(_2\)S - Bent; C)\(_2\) - Linear.
Which of the following instruments is used in detecting the presence of radiation?
Cathode ray tube
Geiger-Muller counter
Mass spectrometer
X-ray tube
Correct answer is B
The Geiger- Muller counter is a device for measuring radioactivity by detecting and counting ionizing particles.
Aluminium is extracted electrolysis from
bauxite
cryolite
duralumin
kaolin
Correct answer is A
No explanation has been provided for this answer.