How many water molecules does hydrated cal-cium sulphate contain
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24%
3
35%
5
30%
2
12%
None
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Lime water reacts with chlorine to give
Anonymous Quiz
46%
Bleaching powder
30%
Baking soda
13%
Baking powder
12%
Washing soda
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Nettle sting is a natural source of which acid?
Anonymous Quiz
31%
Metiwanoic acid
36%
Latic acid
19%
Citric acid
14%
Tantric acid
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When copper oxide and dilute hydrochloric acid react, colour changes to
Anonymous Quiz
24%
White
48%
Bluish green
17%
Blue black
11%
Green
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The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
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23%
Antioxidant
20%
Reduction
53%
Rancidity
4%
Corrosion
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What type of chemical reactions take place when electricity is passed through water?
Anonymous Quiz
19%
Displacement
23%
Combustion
42%
Decomposition
16%
Double displacement
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Copper displaces which of the following metals from its salt solution:
Anonymous Quiz
39%
Znso4
29%
Feso4
24%
Agno3
8%
Niso4
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Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be:
Anonymous Quiz
20%
Green
25%
Red
44%
Blue
11%
Brown
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Heat is evolved during:
Anonymous Quiz
58%
Endothermic
14%
Displacement
23%
Combustion
5%
Combination
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When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by
Anonymous Quiz
28%
Irt
47%
I^2rt
18%
Tri
8%
Ir^2t
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Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.
Anonymous Quiz
13%
1:1
54%
1:2
25%
1:4
8%
1:3
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At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
Anonymous Quiz
18%
93
42%
193
29%
293
11%
393
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the current flowing through a fixed resistor is halved, the heat produced in it will become:
Anonymous Quiz
23%
One fourth
40%
One half
32%
Double
5%
None
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