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.
Which of the following processes does not involve the use of limestone?
Extraction of iron in the blast furnance
Manufacture of tetraoxosulphate (VI) acid by Contact process
Production of washing soda by Solvay process
Production of cement
Correct answer is B
No explanation has been provided for this answer.