Explanation

(a) i) Temporary hardness and permanent hardness.

(ii) Temporary hardness

— Calcium hydrogen rioxocarbonate IV or magnesium hydrogentrioxocarbonate(IV). Permanent hardness

— Calcium etraoxosulphate (VI) or magnesium tetraoxosulphate (VI).

Temporary hardness:

iii) Ca(HCO\(_3\))\(_2\) + Ca(OH)\(_2\) \(\to\) 2CaCO\(_3\) + H\(_2\)O

OR Ca(HCO\(_3\))\(_2\) \(\to\) CaCO\(_3\) + H\(_2\)O + CO\(_2\)

Permanent hardness: CaSO\(_4\) + Na\(_2\)CO\(_3\) \(\to\) CaCO\(_3\) + Na\(_2\)SO\(_4\)

(iv) It forms precipitate of calcium salt or ;cum with soap that waste soap.

(b)(i) 1. Glucose solution —Equal to 7

II. Chlorine water — Less than 7

II. Lime water — Greater than 7

IV. Sour milk — Less than milk.

(ii) I. An acidic oxide reacts with only alkali to form salt and water only while amphoteric oxide react with both acids and alkalis to form salt and water only.

II. A dilute acid contains more water than a concentrated acid.

III. An acid salt contains replacement iydrcgen while a normal salt does not.

(c)(i) Fe\(_{(S)}\) + H\(_2\)SO\(_{4(aq)}\) \(\to\) FeSO\(_{4(aq)}\) + H\(_{2(g)}\) ;

Molar mass of FeSO\(_4\) 56 + 32 + 64 = 152

1 mole of Fe produces 152 mass of FeSO\(_4\) ;

0.5 mole of Fe will produce \(\frac{0.5 \times 152}{1}\) = 76g

ii) Monoclinic and rhombic sulphur

(d)(i) When a piece of damp starch - iodide paper is plunged in a gas ar of chlorine, the paper turns from white to blue or blue black.

(ii) Chlorine displaces iodine from starch odide. The iodine reacts with starch to form a blue black complex.

(iii) Products formed are hydrogen Chloride and nitrogen.

Correct Answer: A) WorldWideWeb

Explanation

The correct answer to this question is A) WorldWideWeb. WorldWideWeb was created by Sir Tim Berners-Lee in 1990. It was the first web browser ever created and was originally only available on NeXT computers. WorldWideWeb was later renamed to Nexus to avoid confusion with the World Wide Web itself.

Netscape Navigator was one of the most popular web browsers in the 1990s, but it was not the first. Internet Explorer was another popular web browser that was developed by Microsoft. Safari is a web browser developed by Apple and Chrome is a web browser developed by Google.

In summary, the first web browser ever created was WorldWideWeb, which was developed by Sir Tim Berners-Lee in 1990. The other options provided in the question, such as Netscape Navigator, Internet Explorer, Safari, and Chrome, were developed later

Correct Answer: A. 100.0C

Explanation

Q = it = 10 x 10 = 100C

Correct Answer: D. 3.6x\(10^{-2}cm\)

Explanation

\(\alpha= \frac{\Delta{L}}{L_1\Delta\theta}; \Delta{L}=\alpha{L_1}\Delta\theta\Rightarrow 1.0\times 10^{-5}\times 300\times (40-28)= 0.036 or 3.6\times 10^{-2}\)

Correct Answer: C. many

Correct Answer: C. Onomatopoeia

Explanation

Onomatopoeia is one way a poet can create sounds in a poem

Correct Answer: C. dykes

Correct Answer: D. A and B above

Correct Answer: A. 9/4

Correct Answer: B. reserved