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Q27. Zinc metal reacts with dilute sulphuric acid to form hydrogen ga
of reaction
(a) decomposition (b) displacement (c) combination (d) nende
Q28
What is water table?
Q29. What is the valency of hydroxide ion in Calcium hydroxide?
Q30 What is the effect of scarcity of water on plants?
031
Give a common example of a natomic gas​

Answer 1

Answer:

27. combination

28. the level below which the ground is saturated with water

29. Valency of Calcium (Ca) = 2 ;

Valency of Hydroxide (OH) = 1.

Interchanging their valencies and writing as subscripts (ignoring 1), formula for Calcium hydroxide is Ca(OH)2.

30. Main Effects of Water Stress on Plants

Reduced Photosynthesis –

• In case of water deficiency, plants will slow down their entire production mechanism and rearrange the photosynthesis apparatus leading to stomatal closure.
• The reduced amount of chlorophyll negatively impacts plant life.

31

• argon
• krypton
• xenon
• though

Answer 2

Answer:

Zinc reacts with dilute HCl to form zinc chloride and hydrogen gas.

Zn+2HCl→ZnCl

2

+H

2

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