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Biology: Answered

SOLUTION

Cactus are mostly found in arid (dry/hot) regions. They possess swollen stem and needle-like leaves which help to conserve water hereby preventing drying out.

Which makes D the answer to this question.

English: Answered

Solution:
To mean "concerning" we can only have three forms
1. Regarding √
2. As regards √ (trick: note the "s" at the end of AS and REGARDS)
3. With regard to √ (trick: WITH has "t" and should be followed with "TO" having "t" too)

Only one of the three will be among the options as any of them is correct.

Chemistry: Answered

SOLUTION

Dissolution of Na2CO3 in water is basic ...

Na2CO3 + 2H2O -----> 2NaOH + H2CO3.

Since the concentration is 3 and the base is a strong base, it dissociates completely in water.

2NaOH ----> 2Na+ + 2OH–

The concentration of sodium ion and hydroxyl ions is the same.

That is, [Na+] = [OH–].

n(Na+) = CV.

n(Na+) = 3 × 0.07 = 0.21mol.

n(Na+) = 2 × 0.21 = 0.42mol


For the second compound,

NaHCO3 + H2O ------> NaOH + H2CO3

NaOH ----> Na+ + OH–.

n(Na+) = CV.

n(Na+) = 1 × 0.03 = 0.03mol.

Total volume = (70 + 30)cm³ = 100cm³ = 0.1dm³.

Total number of moles = 0.42 + 0.03 = 0.45mol.

Concentration = n/V.

C = 0.45/0.1

C = 4.5moldm–³.

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