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26. Which of the following statements is false about a soap? (NTSE Odisha, Stage-I, 2014-15)
The soap solution in water is neutral and can be used to wash all kinds of fabrics
Soap forms lather only in soft water
Soap is metallic salt of higher fatty acids
Soap cannot be used in slightly acidic medium
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27. One of the constituents in Portland Cement is Iron Oxide (Fe2O3) Its function is (NTSE Odisha, Stage-I, 2014-15)
To impart soundness to cement when present in small amount
To make the cement high quality
To impart characteristic grey colour strength and hardness to the cement
To increase the strength and reduce the setting time
28. If a few drops of a concentrated acid accidently spill over the hand of a student, what should be done? (NTSE Chandigarh, Stage-I, 2014-15)
Wash the hand with saline water
Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate
After washing with plenty of water, apply solution of sodium hydroxide on the hand
Neutralise the acid with a strong alkali
29. Which of the following is acidic in nature?
Lime juice
Human blood
Lime water
Antacid
30. pH of soda-water is (NTSE Rajasthan, Stage-I, 2014-15)
7
<7
>7
0
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