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pH Sensitivity of Plants and Animals

Wasp sting co...

Question

Wasp sting contains:

(a) a sugar solution

(b) an acidic liquid

(c) a salt solution

(d) an alkaline liquid

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Solution

Option d

Wasp sting venom is alkaline.

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One of the following does not inject an acidic liquid into the skin through its sting. that is:

(a) honey bee

(b) ant

(c) wasp

(d) nettle leaf hair

Q. Colourless salt

(A) + N a O H Δ ⟶ g a s (B)

giving white fumes with

H C l

+ alkaline solution

(C)

(C) + Z n ⟶ g a s (B) (A) Δ ⟶ g a s (D) + l i q u i d (E)      b o t h t r i a t o m i c

(A), (B), (C), (D)

(E)

.

Substance	pH	Substance	pH
Apples	3.0	Salt	7.0
Baking soda	8.5	Sugar	7.0
Black coffee	5.0	Toothpaste	9.0
Household ammonia	12.0	Vinegar	3.0
Lemon juice	2.5	Washing soda	11.5
Milk	6.5

A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:

(a) What would the students have used to measure the pH?

(b) Which solution is the most acidic?

(c) Which solution is the most alkaline?

(d) Which solutions are neutral?

(e) Which solutions can be used to treat wasp stings?

(f) Which solutions can be used to treat bee stings?

Q. An organic liquid of the composition

C_{4} H_{8} O_{2}

yields a sodium salt of an acid

C_{3} H_{6} O_{2}

and methanol on boiling with

N a O H

solution. The given liquid is:

Q. An alkaline earth metal

(M)

dissolves in liquid ammonia forming a deep blue-black solution. The reaction involved is:

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pH Sensitivity of Plants and Animals

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