UP PGT Chemistry Mock Test - 5 - UPTET MCQ

The dispersion of a freshly precipitated material into colloidal solution by the action of an electrolyte in solution is termed peptization. The electrolyte used is called a peptizing agent. For Example, sols obtained by peptization are: Freshly prepared ferric hydroxide on treatment with a small amount of ferric chloride solution at once forms a dark reddish brown solution. Ferric chloride acts as a peptizing agent.

Sodium saccharin (benzoic sulfimide) is an artificial sweetener with effectively no food energy. It is about 300–400 times as sweet as sucrose but has a bitter or metallic aftertaste, especially at high concentrations. Saccharin is used to sweeten products such as drinks, candies, cookies, and medicines.

(b) Unit cell of fee is divided into eight small cubes. Each cube has four atoms at alternate positions. When joined to each other, they make a regular tetrahedron.
Thus, number of tetrahedral void in small cube = 1 and in eight cubes, voids = 8.

Note  If number of atoms in a cube = N, then, number of octahedral voids = N and number of tetrahedral voids = 2N

• The range of bacteria or other microorganisms that are affected by a certain antibiotic is expressed as its spectrum of action.
• Antibiotics that kill or inhibit a wide range of Gram-positive and Gram-negative bacteria are said to be broad-spectrum antibiotics.
• Chloramphenicol,Vancomycin and ofloxacin are important broad-spectrum antibiotics.

Butylated hydroxy toluene (BHT) is used as an antioxidant. It retards the action of oxygen on the food material and thereby helps in preventing oxidative rancidity of fats.It itself get oxidized and prevent the food.

Rhenium oxide and cooper oxide have same appearance and conductivity.

Wolff-Kishner reduction is suitable for reduction of carbonyls containing olefinic bonds. If Clemmensen reduction is done, HCI also attacks olefinic bonds.

The correct answer is Option C
Fat soluble vitamin - A, D, E, K
Water soluble vitamin - Vitamin B complex and C
So, vitamin B is water soluble.
Vitamins which can dissolve in water are called water-soluble vitamins. Water-soluble vitamins include vitamin-C and vitamin-B because they remove the toxins from our body through urine. Therefore, they are not stored in our body and should be taken on a daily basis through the food we eat.

• According to Dobereiner's law of triads each triad contains three elements.
• He also noticed that the middle element of each of the triads had an atomic weight about halfway between the atomic weights of the other two.

According to Aufbau rule electrons are filled in increasing order of energy.

The correct order of bond dissociation enthalpy is

Permutit is hydrated sodium aluminum silicate, it exchanges it’s sodium ions for divalent ions of calcium and magnesium, permutit when fully exhausted can be regenerated by treating with 10% of sodium chloride solution. It is the most efficient method to get water with zero degrees of hardness.

E₁ = Energy of H-atom in the ground state = 13.6 eV 

Energy absorbed = (13.6 x 1.5) = 20.4 eV
E₂ = Energy of the excited state
= 13.6+ 20.4= 34.0 eV
ΔE = KE = (E₂ - E₁)
= 34.0 - 13.6 = 20.4 eV

• Teeth are composed of calcium, phosphorus, and other minerals. 
• Bones contain calcium, phosphorus, sodium and other minerals, but mostly consist of the protein collagen.

Additional Information: The hardest part of the human body, teeth mostly consist of a calcified tissue called dentin. The tooth's dentine tissue is covered in enamel, that hard, shiny layer that you brush.

A basic oxide is one which dissolves in water gives a base. MgO when dissolved in water gives Mg(OH)2 which is a base and others give acids

Δ_o value is directly proportional to energy and inversely related to the wavelength. Also, more the ligand is a strong field ligand More will be the value of Δ_o and lower will be its wavelength. Among the given complexes the strength of ligands are Br⁻ < H2O < en.

Since the emitted colours are red, green, blue the absorbed colours must be green,red,orange. Hence the  compound [M(H2O)6]²⁺, [M(en)3]²⁺, [M(Br)6]⁴⁻ are blue red and green respectively. Hence option B is correct.

If activation energy is high rate of reaction will decrease and reaction will be slow.

Due to symmetry in the complex [Co(NH₃)₃CI₃], it failed to show optical isomerism. The type of coordination entity show fac and mer isomerism or geometrical isomerism.

The facial (fac) and meridional (mer) isomers of [Co(NH₃)₃CI₃]. 

The solubility of Agbr in presence of 10^-7 molar AgNo³ is 3 x 10^-7 M. therefore [Br] 3 x 10^-4 M³, [Ag⁺] = 4 x 10^-4 m³ and [No^3-]= 10^-4 m³

Therefore 

All of the above mentioned methods are used to detect the basic structure of the sample, hence can easily detect the defects present in a sample.

• Crystalline solids are anisotropic in nature, that is, some of their physical properties like electrical resistance or refractive index show different values when measured along with different directions in the same crystals.
• This arises from different arrangements of particles in different directions.

The boiling point is in the following order

Alkyne> Alkene> n-Alkane> Branched alkane

1-butyne>1-butene> n-butane> isobutane

Option D is correct.

For this, we will add combustion reactions of both CO and H₂ as both combined will give us energy.
Δ_rH = -283 kJ+ (-242 kJ) = -525 kJ

Stability of hydrides decreases down the group so most stable is H₂O  

PCl₅ dissociation a closed container