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Beta particles are fast moving streams of electron, having a mass number of 0 and atomic number as -1. If Thorium undergoes radioactivity to emit a beta particle, it means mass number of the new element Pa will be unchanged but the atomic number will be increased by 1. i.e 91. Thus, y = 234-0 = 234, while x = 90 - (-1) = 90 +1 = 91. Option A is the correct answer

In the contact process above; a temperature of about 500ºC and use of Vanadium(V)Oxide catalyst increase the reaction rate and enable equilibrium to be reached in a shorter time.

Silver halides are chemical compounds that are formed when silver reacts with halogens. They are used in photographic film and paper because they react with light to form an image. Silver chloride and silver bromate are the most sensitive to light among the three most common silver halide compounds.However, the order of sensitivity to light is in the order of their reactivity as you go down the group in the periodic table. AgCl > AgBr > AgI. The correct answer is option D

The activity series is a type of ordering system for elements, which ranks how reactive a certain element is in relation to other elements. The order of reactivity of metals is as follows, Potassium > Sodium > Lithium > Calcium > Magnesium > Aluminium > Zinc > Iron > Copper >

< Q = < R (OQ = OR = radii) < QOR = 180^\circ - 2(40^\circ) = 100^\circ < QSR = < RPQ = \(\frac{1}{2}\) < QOR = \(\frac{100}{2} = 50^\circ\)

From the figure above In △BOC, 2x + 30º = 180º Therefore, x = \(\frac{180º - 30º}{2}\) = 75º Each interior angle = 2 times x = 2 x 75 = 150º OR To calculate the interior angle of a regular convex polygon where each side subtends an angle of \(30^\circ\) at the center, we follow these steps: Determine the number of sides (n) The angle subtended at the center by each side is given as \(30^\circ\). The total angle around a point is \(360^\circ\). \(n = \frac{360^\circ}{30^\circ}\) = 12 So, the polygon has 12 sides. Calculate the interior angle. The formula for the interior angle A of a regular polygon is: \(A = \frac{(n - 2) \times 180^\circ}{n}\) Substituting n = 12: \(A = \frac{(12 - 2) \times 180^\circ}{12} = \frac{10 \times 180^\circ}{12} = \frac{1800^\circ}{12} = 150^\circ\) Each interior angle of the regular convex polygon is \(150^\circ\).

\(27^{(1+x)}\) = 9 \(3^{3(1+x)} = 3^2\) 3(1+x) = 2 3 + 3x = 2 3x = -1 x = \(\frac{-1}{3}\)

\(2x^2 + 3x - 14\) \(2x^2 + 7x - 4x - 14\) \(x(2x + 7) - 2(2x + 7)\) = \((x - 2)(2x + 7)\) The other factor = (x - 2).

boat - /bəʊt/ board - /bɔːd/ bought - /bɔːt/ go - /ɡəʊ/ glory - /ˈɡlɔː.ri/

air and heir are both nouns with the same vowel sounds pronounced as /eə/

pleasure is pronounced as [ˈpleʒə], our area of emphasis is on the ''ea'' sound which goes thus ''e''. pliable--- [ˈplʌɪəb(ə)l] pleat----- [pliːt] plenary-- [ˈpliːnəri] jeopardy--- [ˈdʒepədi]. from the list of possible pronunciations above, you can see that only jeopardy [ˈdʒepədi] has the vowel sound ''e'' and it is therefore the correct answer to the question.

Thunder |ˈ\thetaʌndə| (a) prefer |prɪˈfɜː| (b) differ |ˈdɪfə| (c) confer |kənˈfɜː| (d) defer |dɪˈfɜː|

The noun tear is pronounced as /tɪə/ dare - /deə/ care - /keə/ here - /hɪə/ wear - /weə/

Both thought and theater have similar consonant sounds at the beginning. The 'th' is pronounced alike with the tip of the tongue in between the front teeth. Hence we have; thought: /\thetaɔːt/ theatre: /ˈ\thetaɪətə/

caliph; /ˈkeɪlɪf,ˈkalɪf/ powerful; /ˈpaʊəfʊl,ˈpaʊəf(ə)l/