DSSSB PGT Chemistry Mock Test - 3 - DSSSB TGT/PGT/PRT MCQ

The correct option is C.

Two less than 5 times a number is greater than the third multiple of the number.
5x - 2 >3x
5x - 3x > 2
2x > 2
x > 1

Directive Principles of State Policy are based on the principles of socialism and represent the ideals to be achieved by the State for the welfare of its citizens.

Even scientific institute has shown that the yajna bhasma has positive effect on human body .

According to the question:
Volume of the drum = πr²h

Volume of small can

Divide both the above volumes to get the maximum number of cans as 52.73, i.e. maximum 52 cans can be completely filled. 

उपर्युक्त गद्यांश के अनुसार संसार में सबसे मूल्यवान वस्तु समय है।
क्योंकि दुनिया की अधिकांश वस्तुओं को घटाया-बढ़ाया जा सकता है, पर समय का एक क्षण भी बढ़ा पाना व्यक्ति के बस में नहीं है।

Molecular mass will be = 6(12) + 12(1) + 6(16) = 180u.

Chemical Formula: ZnSO₄
Molar Mass: 161.47 g/mol (anhydrous)

Standard temperature and pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. At STP, 1 mole of any gas occupies 22.4 liters.
First, calculate the number of moles of hydrogen gas (H2) in 67.2 liters:
67.2 L / 22.4 L/mole = 3 moles of H2
Each molecule of H2 contains 2 atoms of hydrogen. Therefore, 3 moles of H2 contains:
3 moles * (6.022 x 10^23 molecules/mole) * 2 atoms/molecule = 3.6132 x 10^24 atoms of hydrogen.

Metals have low ionization energy because of there tendency to lose electrons.

(a) Edge length = a, Volume of one face = a³ Volume of six faces of a cube = 6a³ = V Radius = r

fee can be hexagonal closest packed (hep)

or cubic closest packed (ccp)

z = number of atoms in unit cell.

Emission spectrum is recorded when a electron de excites from higher energy level to ground state.

Multimolecular colloids are formed when a large number of atoms or molecules of a substance aggregate together to form speices having size in colloidal range. sulphur sol contains a thousand of S8 molecules.

The Tyndall Effect is the effect of light scattering in colloidal dispersion, while showing no light in a true solution. This effect is used to determine whether a mixture is a true solution or a colloid.

The correct answer is option C
If liquids A and B form an ideal solution, the enthalpy of mixing is zero. For an ideal solution ΔVmixing​=0, ΔHmixing​=0. The Gibbs free energy is always negative and becomes more negative as the temperature is increased.

(Three electrons extra than octet, it can donate three electrons)

(Three electrons short of octet, it can gain three electrons) 
Thus, M³⁺ Z^3-
Compound is MZ,

IV. Electrostatic force of attraction between  and
V. H₂O molecules joined together by dipole-dipole interaction.
VI. Outer H₂O molecule joined to by ion-dipole interaction.

(b) BrF₃ - T-shaped (sp³d²)

deuterium , also known as heavy hydrogen) is one of two stable isotopes of hydrogen (the other being protium, orhydrogen-1). The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common protium has no neutron in the nucleus.

The physical properties of isotopes of the same element are not identical because the atomic mass and mass number differ. This affects physical properties such as density and temperature of change of state, eg. boiling and melting point.

Ice floats on water, this is because of the density of ice i.e. mass per unit volume (density of ice is 0.9167 g/cm³ and density of water is 1g/cm³) is lesser than that of water. This is the reason, ice floats over water.

The wide range of oxidation state of actinoids is due to the fact that the 5f, 6d and 7s energy levels are of comparable energies and all these three subshells can participate in comparison to lanthanoid. The 5f orbitals extend farther from the nucleus than the 4f orbitals.

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 given compound is superimposable on its mirror image, so it is achiral. Achiral molecules which have chirality centers are called meso compounds. Meso compounds are possible if two (or more) chirality centers in a molecule have the same set of four substituents.

In the above reaction, four stereoisomers, two pairs of enantiomers are formed. Each member of a pair of enantiomer is diastereomer of each member of other pair of enantiomer. Hence, fractional crystallisation would give two fractions, each containing racemic mixture.

Dianion is better hydride donor. Also the electron donating group (CH₃O) increases hydride (H^-) donating a bility .

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.