Everyday Science MCQs

5120 MCQs  (Page 273 of 512)

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Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?
A. As nitrometer
B. To remove air bubbles from molten metal
C. To produce alloy
D. As insulator
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Silicon differ from silica by a group of__________________?
A. Ch3
B. Oh
C. Och3
D. O2
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Boron is non metal while other elements of IIIA group are metals. This is because______________?
A. It has small size
B. It has high nuclear charge
C. It forms molecular addition compounds
D. All of the above
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The coloured glassy mass in borax bead test is due to the formation of___________________?
A. Metal borate
B. Metal meta borate
C. Metal boride
D. Metal silicate
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If temperature of gallium arsenide is increased then its conductivity will___________________?
A. Decrease
B. Increase
C. Remains constant
D. First decreases then increases
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Which of the following will decompose to produce litharge_________________?
A. Pb2o
B. Pb3o4
C. Pbo2
D. All of the above
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One of the outstanding features of boron is its ability to form__________________?
A. Molecular addition compounds
B. Molecular crystals
C. Semiconductors
D. Ionic compounds
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Borax is a white crystalline solid and it is_________________?
A. More soluble in cold water
B. More soluble in hot water
C. Insoluble in water
D. Soluble only in organic solvents
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Special features of borate glass is that it is_________________?
A. Heat resistant
B. Low melting
C. Used to prepare chemical garden
D. Green in colour
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Aluminium oxide is_________________?
A. Acidic oxide
B. Basic oxide
C. Amphoteric oxide
D. It does not exists
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Word of the Day
25 Jul
January
a preference or special liking for something; a bias in favour of something.
2021:00:00

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