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Chemistry MCQs for DSSSB TGT/PGT/PRT Exam

It covers all Important Questions with answers on Chemistry for the DSSSB TGT/PGT/PRT exam. The questions are based on important topics. Details about the questions:
  • Topic: Chemistry
  • Type of Questions: MCQs with solutions
  • Number of Questions: 49
  • You can attempt them on EduRev to score high in DSSSB TGT/PGT/PRT exam.

Hydrogen bonding reduces the quality of water molecules to
  • a)
    repel
  • b)
    attract
  • c)
    compactly arrange
  • d)
    slide over each other
Correct answer is option 'D'. Can you explain this answer?

Shreya Gupta answered
Hydrogen bonding is a type of attractive force that occurs between molecules when a hydrogen atom is covalently bonded to a highly electronegative atom, such as oxygen, nitrogen, or fluorine. In water molecules, hydrogen bonding occurs between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of another water molecule. These hydrogen bonds cause the water molecules to attract each other and stick together, which gives water many of its unique properties, such as its high surface tension and its ability to act as a solvent. The hydrogen bonds do not cause the water molecules to repel each other or to compactly arrange, but they do make it more difficult for the molecules to slide over each other, which contributes to the high viscosity of water.

In comparing gases with liquids , gases have ........ compressibility and...........density.
  • a)
    greater, smalle
  • b)
    greater, greater
  • c)
    smaller, smaller
  • d)
    smaller, greater
Correct answer is option 'A'. Can you explain this answer?

Neha Patel answered
In a gas, the distance between molecules, whether monatomic or polyatomic, is very large compared with the size of the molecules; thus gases have a low density and are highly compressible.Density: The molecules of a liquid are packed relatively close together. Consequently, liquids are much denser than gases.

Intermolecular forces can be out of the following.
  • a)
    van der Waais' forces
  • b)
    Electrostatic forces existing between two oppositely charged ions
  • c)
    Covalent bond between two like atoms
  • d)
    Gravitational force
Correct answer is option 'A'. Can you explain this answer?

Shreya Gupta answered
In molecular physics, the van der Waals forces, named after Dutch scientist Johannes Diderik van der Waals, are distance-dependent interactions between atoms or molecules. Unlike ionic or covalent bonds, these attractions are not a result of any chemical electronic bond, and they are comparatively weak and more susceptible to being perturbed. Van der Waals forces quickly vanish at longer distances between interacting molecules.

Van der Waals forces play a fundamental role in fields as diverse as supramolecular chemistry, structural biology, polymer science, nanotechnology, surface science, and condensed matter physics. Van der Waals forces also define many properties of organic compounds and molecular solids, including their solubility in polar and non-polar media.

Van der waals forces include the following except
  • a)
    London forces
  • b)
    dipole - dipole forces 
  • c)
    dipole- include dipole forces
  • d)
    chemical bonding forces
Correct answer is option 'D'. Can you explain this answer?

Om Desai answered
Chemical bonding forces are not considered to be part of van der Waals forces. Van der Waals forces include London forces, dipole-dipole forces, and dipole-induced dipole forces.
 

The element used in the manufacture of safety matches is –
  • a)
    Phosphorous  
  • b)
    Magnesium  
  • c)
    Silicon  
  • d)
    Sulphur
Correct answer is option 'A'. Can you explain this answer?

Dia Mehta answered
One end of a match is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. The coated end of a match, known as the match "head," contains either phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as a binder.

Diamond is harder than graphite because of –
  • a)
    difference in layers of atoms
  • b)
    tetrahedral structure of diamond
  • c)
    difference of crystalline structures
  • d)
    None of these
Correct answer is option 'A'. Can you explain this answer?

Eshaan Kapoor answered
Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon sharing a side with another pentagon or each pentagon sharing a point with another pentagon. All the points are linked together in some way. Graphite's structure is very loose, with its bonds forming layers.

Dipole-dipole interaction energy between stationary polar molecules is proportional to x and that between rotating molecules is proportional to y. Assume distance between polar molecules as r, then x and y are
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?

Dipole-dipole interaction energy between stationary polar molecules is proportional to 1/ r3 and that between rotating polar molecules is proportional to 1/ r6 where ‘r’ is the distance between polar molecules
Besides dipole - dipole interaction, polar molecules can interact by London forces also.

Based on the following statements I and IS, select the correct answer from the codes given.
Statement I
Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.
Statement II
Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.
  • a)
    Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
  • b)
    Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
  • c)
    Statement I is correct but Statement il is incorrect
  • d)
    Statement II is correct but Statement I is incorrect
Correct answer is option 'A'. Can you explain this answer?

Geetika Shah answered
Thermal energy is the energy of a body arising from motion of its atoms or molecules. It is directly proportional to the temperature of the substance. It is the measure of average kinetic energy of the particles of the matter and is thus responsible for movement of particles. This movement of particles is called thermal motion. We have already learnt that intermolecular forces tend to keep the molecules together but thermal energy of the molecules tends to keep them apart. Three states of matter are the result of balance between intermolecular forces and the thermal energy of the molecules.

Atom which must be present in hydrogen bonding is
  • a)
    hydrogen
  • b)
    sodium
  • c)
    calcium
  • d)
    sulphur
Correct answer is option 'A'. Can you explain this answer?

Nandini Patel answered
A hydrogen bond is the attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. Usually the electronegative atom is oxygen, nitrogen, or fluorine, which has a partial negative charge. The hydrogen then has the partial positive charge.

Which district has become the first one in India to have high speed Rural Broadband Network?
  • a)
    Ajmer of Rajasthan
  • b)
    Vidisha of Madhya Pradesh
  • c)
    Idukki of Kerala
  • d)
    Hisar of Haryana
Correct answer is option 'C'. Can you explain this answer?

Asha Kumar answered
Idukki district of Kerala has become first district in India to have high speed Rural Broadband Network i.e. National Optical Fibre Network (NOFN) Internet connectivity. NOFN is the largest rural connectivity project of its kind in the world.

Where do most of the known asteroids orbit the Sun?
  • a)
    Between the orbits of Mars and Jupiter
  • b)
    Between the orbits of Venus and Earth
  • c)
    Between the orbits of Earth and Mars
  • d)
    Between the orbits of Pluto and Saturn
Correct answer is option 'A'. Can you explain this answer?

Deepika Gupta answered
The asteroid belt is a doughnut-shaped concentration of many different sized asteroids between the orbits of Mars and Jupiter, closer to the orbit of Mars. The asteroids orbit the Sun. The asteroid belt is not smooth but there are concentric gaps in it known as Kirkwood gaps.

Percentage of carbon in steel ranges from –
  • a)
    0.1 to 1.5  
  • b)
    1.5 to 3.0  
  • c)
    3.0 to 4.0  
  • d)
    4.0 to 6.0
Correct answer is option 'A'. Can you explain this answer?

Aryan Khanna answered
Steel is an alloy made by combining iron and other elements, the most common of these being carbon. When carbon is used, its content in the steel is between 0.2% and 2. 1% by weight, depending on the grade. Other alloying elements sometimes used are manganese, chromium, vanadium and tungsten.

The gas used for filling weather balloons is –
  • a)
    helium  
  • b)
    hydrogen  
  • c)
    air  
  • d)
    nitrogen
Correct answer is option 'A'. Can you explain this answer?

Eshaan Kapoor answered
A balloon is an inflatable flexible bag filled with a gas, such as helium, hydrogen, nitrous oxide, oxygen, or air. Modern balloons can be made from materials such as rubber, latex, polychloroprene, or a nylon fabric, while some early balloons were made of dried animal bladders, such as the pig bladder. Some balloons are used for decorative purposes, while others are used for practical purposes such as meteorology, medical treatment, military defense, or transportation.

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