SAT (Stage-2) Mock Test - 8

Given: Speed of the man (object) = 2 km/hr
Let's consider that the distance between the man and the plane mirror be 'x' km.
So, the distance between the man and his image will be '2x' km because the distance of image and object in case of the plane mirror is equal.
Thus, speed of the man = x/t = 2 km/hr
Then, speed of the image = 2x/t = 4 km/hr

In the glass slab, angle of incidence = angle of emergence
A ray of light strikes a thick parallel sided glass slab with an angle of incidence of 40⁰. The angle of the beam emerging from the other side of the slab with the normal is 40⁰.

Chloralkali is an industrial process for the electrolysis of sodium chloride solution. The following reaction takes place in this process:

2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂

For bases, the value of pH is greater than 7, i.e. the stronger the base, the higher the pH value. Out of the given options, HCl and CH₃COOH are acids whose pH value is less than 7 and out of Ca(OH)₂ and NaOH, NaOH is the stronger base. Thus, NaOH has the highest pH value among these all.

Molecular weight of N₂ = 28 g
Therefore, 112 g of N₂ is equivalent to 112/28 = 4 moles of nitrogen molecules.
Therefore, 112 g of N₂ contains 4 x 6.022 x 10²³ molecules = 24.088 x 10²³ molecules or 2 x 24.088 x 10²³ atoms = 48.176 x 10²³ atoms.

Mass = Molar mass × Number of moles
Molar mass of Ca(OH)₂ = 40 + 2(16 + 1)
= 40 + 34 = 74 g
Therefore, mass of Ca(OH)₂ = 74 × 2.5 = 185 g

The bond formed between aluminium and fluorine is ionic because metals form ionic bonds with non-metals.

Only statement A is incorrect, as the compound is not a mixture of its elements but a pure substance having new properties.

Atoms of an element differ from atoms of all the other elements in atomic number and electronic configuration only. The number of neutrons and valence electrons can be the same for two or more elements.