Chemistry

For which of the following compounds the term empirical formula cannot be applied ?

A. NaCl

B. H2O

C. CCI4

D. It can be applied to all mentioned above

Correct! Wrong!

Percentage of calcium in calcium carbonate is___________________?

A. 80%

B. 30%

C. 40%

D. 20%

Correct! Wrong!

Which one of the following is not the mono isotopic element ?

A. arsenic

B. uranium

C. iodine

D. nickel

Correct! Wrong!

Covalent network crystals have_____________?

A. higher melting point then molecular crystals

B. lower melting point then molecular crystals

C. discrete molecules linked by Van der waals forces

D. hydrogen bonding

Correct! Wrong!

Which of the following is not a macromolecule ?

A. sand

B. haemoglobin

C. diamond

D. maltose

Correct! Wrong!

Which of the following statements about isotopes is correct ?

A. Isotopes with odd atomic number are abundant

B. Isotopes with odd atomic number and even mass number are abundant

C. Isotopes with even atomic number and even mass number are abundant

Correct! Wrong!

Avogadros number may represent_________________?

A. volume of particles

B. number of particles

C. mass of particles

D. All of the above

Correct! Wrong!

The number of peaks obtained in mass spectrometry shows____________________?

A. Relative abundance

B. Average mass of element

C. Number of isotopes

D. Relative isotopic mass

Correct! Wrong!

Which of the following terms is not used for ionic compound ?

A. formula unit

B. empirical formula

C. molecular formula

D. formula mass

Correct! Wrong!

Diameter of an atom is in the order of________________?

A. 0.2m

B. 0.2mm

C. 0.2nm

D. 0.2pm

Correct! Wrong!

Which of the following are isoelectronic species ?

A. H+ H H-

B. Li+ Na+ K+

C. C1- Br- I

D. F- Ne Na+

Correct! Wrong!

All of the following substances are crystalline except_____________?

A. Ice

B. Diamond

C. Sucrose

D. Plastic

Correct! Wrong!

When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?

A. lighter

B. intermediate

C. heavier

D. are collected at same time

Correct! Wrong!

Molecular ions are formed by passing______________________?

A. High energy electron beam

B. ? – particle

C. X-rays

D. All of the above

Correct! Wrong!

What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?

A. Paint

B. Glass

C. Gun Powder

D. Cement

Correct! Wrong!

The mass of decimole of electrons (NA) is___________________?

A. 1.008 mg

B. 0.184 mg

C. 0.054 mg

D. 5.4 mg

Correct! Wrong!

The number of moles of CO2 which contains 16 g of oxygen is__________________?

A. 0.25

B. 0.5

C. 0.75

D. 1

Correct! Wrong!

Isotopes of the same elements has__________________?

A. different number of protons

B. same number of neutrons

C. different number of neutrons

D. same mass number (nucleon number)

Correct! Wrong!

Which one is true about isotope ?

A. Same number of neutrons

B. Same mass number

C. Same physical properties

D. Same chemical properties

Correct! Wrong!

Mass spectrometer is used to determine Mass number of isotopes and___________________?

A. Atomic number

B. Relative abundance

C. Electronic configuration

D. All of the above

Correct! Wrong!

Which of the following terms is used for the mass of chlorine 35.5 ?

A. relative atomic mass

B. mass number

C. atomic weight

D. relative isotopic mass

Correct! Wrong!

One mole of CO2 contains?

A. 6.022 x 1023 atoms of oxygen

B. 22-gram electrons

C. 6.022 x 1023 atms of carbon

D. both B. & C.

Correct! Wrong!

Molecular mass of water (18g) means__________________?

A. 1-mole molecules of water

B. 1-gram molecule of water

C. 3-gram atoms

D. all

Correct! Wrong!

Size of molecule depends upon________________?

A. Atomicity

B. Shape of molecule

C. Both A and B

D. Difficult to predict

Correct! Wrong!

Empirical formula of chloroform is____________________?

A. CH2 C12

B. CH3C1

C. CC14

D. CHCL3

Correct! Wrong!

Electron was discovered by?

A. Michael Faraday

B. James Maxwell

C. Yuri Gagarin

D. J.J Thomson

Correct! Wrong!

The soul of chemistry is dealing with___________?

A. Internal structural changes in matter

B. Composition of matter

C. Properties of matter

D. Composition and properties of matter

Correct! Wrong!

How many isotopes have odd atomic number ?

A. 154

B. 280

C. 86

D. 300

Correct! Wrong!

The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?

A. Gas

B. Liquid

C. Volatile solid

D. All

Correct! Wrong!

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

A. ionic substances

B. metallic substances

C. molecular solids

D. covalent network solids

Correct! Wrong!

The properties of an element mosly corresponds to that isotope which has greater_________________?

A. Mass number

B. Atomic mass

C. Relative abundance

D. all of the above

Correct! Wrong!

1 a.m.u =__________________?

A. 1.6 x 10-27 kg

B. 1.6 x 10-24 kg

C. 1.6 x 10-26 kg

D. 1.6 x 10-28 kg

Correct! Wrong!

The volume occupied by 2.8 g of N2 at STP______________________?

A. 2.24 dm3

B. 22.4 dm3

C. 1.12 dm3

D. 112 dm3

Correct! Wrong!

Which of the following is a substance?

A. Sea water

B. Brass

C. Tape water

D. Graphite

Correct! Wrong!

The number of isotopes of elements with even mass number and even atomic number are ________________?

A. 280

B. 300

C. 154

D. 54

Correct! Wrong!

The radioactive isotope of hydrogen is called___________?

A. tritium

B. deuterium

C. protium

D. ortho-hydrogen

Correct! Wrong!

Which one of the following has the maximum number of isotopes ?

A. oxygen

B. carbon

C. tin

D. chlorine

Correct! Wrong!

Which of the following ion formation is always exothermic ?

A. Uni-negative

B. Uni-positive

C. Di-negative

D. Di-positive

Correct! Wrong!

moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

A. 0.18 mole

B. 0.27 mole

C. 0.24 mole

D. 0.09 mole

Correct! Wrong!

Sodium carbonate is produced by____________?

A. haber process

B. Amonia solvay process

C. decons process

D. lead chamber process

Correct! Wrong!

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Chemistry

For which of the following compounds the term empirical formula cannot be applied ?

Percentage of calcium in calcium carbonate is___________________?

Which one of the following is not the mono isotopic element ?

Covalent network crystals have_____________?

Which of the following is not a macromolecule ?

Which of the following statements about isotopes is correct ?

Avogadros number may represent_________________?

The number of peaks obtained in mass spectrometry shows____________________?

Which of the following terms is not used for ionic compound ?

Diameter of an atom is in the order of________________?

Which of the following are isoelectronic species ?

All of the following substances are crystalline except_____________?

When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?

Molecular ions are formed by passing______________________?

What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?

The mass of decimole of electrons (NA) is___________________?

The number of moles of CO2 which contains 16 g of oxygen is__________________?

Isotopes of the same elements has__________________?

Which one is true about isotope ?

Mass spectrometer is used to determine Mass number of isotopes and___________________?

Which of the following terms is used for the mass of chlorine 35.5 ?

One mole of CO2 contains?

Molecular mass of water (18g) means__________________?

Size of molecule depends upon________________?

Empirical formula of chloroform is____________________?

Electron was discovered by?

The soul of chemistry is dealing with___________?

How many isotopes have odd atomic number ?

The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

The properties of an element mosly corresponds to that isotope which has greater_________________?

1 a.m.u =__________________?

The volume occupied by 2.8 g of N2 at STP______________________?

Which of the following is a substance?

The number of isotopes of elements with even mass number and even atomic number are ________________?

The radioactive isotope of hydrogen is called___________?

Which one of the following has the maximum number of isotopes ?

Which of the following ion formation is always exothermic ?

moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

Sodium carbonate is produced by____________?

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