SAT (Stage-1) Mock Test - 87

The component with a lower boiling point is collected in the upper parts of the fractional column. This is because the boiling point of the liquid is also the point of condensation of the vapour. Thus, the component with lower boiling points will condense at lower temperatures, that is in the upper regions of the fractional column.

Non-metals are good oxidising agents because they are electronegative elements. They accept electrons and get reduced themselves. Hence, they function as oxidising agents.

Stainless steel and steel are ferrous alloys. The major component of these alloys is iron and other elements like carbon, nickel and chromium are added in order to enhance the properties of iron.

Krypton is not a metalloid. It is a non-metal.

15(y + 165) = 100y
15y + 2475 = 100y
2475 = 100y - 15y
2475 = 85y

2475/85 = y
y = 29.11 ml

Water and alcohol are miscible liquids and differ in their boiling points by more than 25 K.

A is the correct option, as:
(n + l) for 2p = 2 + 1 = 3
(n + l) for 3s = 3 + 0 = 3

C is the correct option, as:
(n + l) for 3p = 3 + 1 = 4
(n + l) for 4s = 4 + 0 = 4

D is the correct option, as:
(n + l) for 3d = 3 + 2 = 5
(n + l) for 5s = 5 + 0 = 5

The given formula is that for alkenes and cycloalkanes.
Unsaturated compounds produce a clean blue flame only when burnt in pure oxygen.
In the presence of 21% oxygen, they burn with a sooty flame.

Volume of N₂ gas at STP = 56 L

Number of moles of N₂ gas given = 

According to the balanced equation:

Number of moles of NH₃ formed = 2 × number of moles of nitrogen = 5

Mass of NH₃ formed = Number of moles × molar mass = 5 × 17 = 85 g

The melting point of the alkali metals decreases down the group.
All the other properties increase down the group.
The number of shells and hence the atomic radius increases down the group.
The ionisation energy of the alkali metals decreases down the group and hence the metallic character increases.

Let the number of protons be x.
Number of neutrons = x + 2
p + n = A
x + x + 2 = 34
x = 16
Hence, the element is sulphur and the species is sulphide ion (S^-2).
Number of electrons = 16 + 2 = 18

Complete combustion of carbon compounds takes place in the presence of abundance of oxygen and carbon is oxidised to CO₂.
Hence, ethanol undergoes combustion in the presence of sufficient amount of oxygen.



In the presence of oxidising agents like alkaline KMnO₄ or acidic K₂Cr₂O₇, ethanol gets oxidised to ethanoic acid, but complete combustion does not take place.

Vacuoles are absent in meristematic tissue. Vacuole is a cell organelle used to store waste materials, nutrients, excess salts, etc. and usually big and more in number in mature cells. Meristematic cells are mainly concerned with cell division by mitosis. They do not have any waste material to store, so vacuoles are usually absent in the meristematic cells.

Cells of cork are dead and have a chemical called suberin in their walls that makes them impervious to gases and water.