EmSAT Chemistry Mock Test- 3 - EmSAT Achieve MCQ

KIO₄ + H₂O₂ → KIO₃ + H₂O + O₂ In this reaction H₂O₂ act as reducing agent
NH₂OH + 3H₂O₂ → HNO₃ + 4H₂O In this reaction H₂O₂ act as oxidising agent.

Heavy water is formed by the combination of heavier isotope ₁H² or D with oxygen.

When sodium peroxide is treated with dilute sulphuric acid, we get sodium sulfate and hydrogen peroxide as a product. It is the preparation method of hydrogen peroxide. It is an example of acid-base reaction.
Na₂O₂+H₂SO₄→Na₂SO₄+H₂O₂

NO ⁺ , CN ^- and N₂ all have a bond order = 3.
These are isoelectronic means have same number of electrons, in this case have 14 e ^- and isostructural as they are all linear in shape. These can be ions or neutral species.
All the options are correct.

Complex with bidentate ligand form chelate ring and chelation is caused by intramolecular hydrogen bonding also.i.e. (1) Ethylenediamine ligand form ring when it is attached to metal in a complex .(2) Chelation takes place in ortho nitro phenol due to intra molecular H bonding.

HCl g is covalent whereas NaCl is an ionic solid due to small difference in their electronegativities.
In HCl , the difference in electronegativity of H and Cl atoms is less than 2.10 , whereas in NaCl , the difference in electronegativities of Na and Cl atoms is more than 2.10 .
Electronegativity of Cl = 3.1
Electronegativity of H = 2.2
Electronegativity of Na = 0 .93
Electronegativity difference between H and Cl = 0 . 95
Electronegativity difference between Na and Cl = 2.22

NaF has the highest melting point because F^- has the smallest size, lattice energy is highest.

Lattice Energy ∝ Melting point

The given formula of chloride is MCl ₂.
Since chloride has uni-negative charge, the valency of metal will be 2.
The phosphate ion PO₄ ^{- 3} has a valency of 3 .
Hence, by cross valency method for ions of M⁺² and PO₄^-3 , the metal phosphate formula will be M₃ ( PO₄ )₂ .

As F₅ has sp³d  hybridization. In sp³d hybridization, it is  d_z² orbitals which takes part

When heavy water reacts with calcium carbide, the products formed are deutero acetylene (C₂D₂​) and calcium deuteroxide (Ca(OD)₂ 
CaC₂+2D₂O→Ca(OD)₂+C₂D₂
These videos will help you learn the above concepts

Mn + extremely dilute HNO₃ (2%)  → Mn(NO₃) + H₂ ↑⏐

Dihydrogen of high degree of purity (>99.95%) is obtained by the electrolysis of warm aqueous barium hydroxide solution between nickel electrodes.

Peroxodisulphate obtained by electrolytic oxidation of acidified sulphate solutions at high current density, on hydrolysis yields hydrogen peroxide.

Hydrogen peroxide has a non–planar structure. The molecular dimensions in the gas phase and solid phase are shown below.


H₂O₂  structure in solid phase at 110 K, dihedral angle is  90.2° .

In this reaction hydrogen peroxide acts as a reducing agent and it reduces KMnO₄ to Mn²⁺ ions.
Potassium permanganate is used as an oxidizing agent to determine the hydrogen peroxide amount in a solution. Hydrogen peroxide reduces the permanganate to a colorless product. 

Li⁺ and Mg²⁺ ions have similar polarising power or ionic potential and therefore, have similar properties. This type of relationship of the first element of a group with the second element of the next group is known as diagonal relationship.

A mixture of two gases can be separated by fractional distillation technique. Fractional distillation is a process by which components in a chemical mixture are separated into different parts called fractions according to their different boiling points.

According to Markownikoff’s rule, the negative part of the unsymmetrical reagent adds to less hydrogenated (more substituted) carbon atom of the double bond, 

Helium is not soluble in blood even under high pressure, a mixture of 80% helium and 20% oxygen is used instead of ordinary air, by sea divers for respiration.

Crooke's glass is a special type of glass containing cerium oxide. It does not allow the passage of ultraviolet rays and is used for making lenses.

Acetone forms chloroform when heated with bleaching powder.

At STP,44 g of CO₂ weighs = 22.4 litre

The octane number of fuel can be improved by increasing the percentage of branched chain alkanes, alkenes and aromatic hydrocarbons. Thus octane number can be changed by isomerisation (reforming), alkylation and aromatisation (cyclisation) etc.

The triple point of any substance is that temperature and pressure at which the material can coexist in all three phases (solid, liquid and gas) in equilibrium. Specifically, the triple point of water is 273.16 K at 611.2 Pa.

The dominant oxidation state in both (lanthanides and actinides) is +3. The properties of actinides are very similar to those of lanthanides when both are in +3 state.

Electronegativity is the property of a bonded atom. The relative tendency of an atom to attract the shared pair of electron towards itself is called electro negativity.

Group I elements are so highly electropositive that they emit electrons even when exposed to light (photoelectric effect) and this character increases on moving down the group from lithium towards cesium.