Chemistry

Sodium carbonate is produced by____________?

A. haber process

B. Amonia solvay process

C. decons process

D. lead chamber process

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!

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!

Diameter of an atom is in the order of________________?

A. 0.2m

B. 0.2mm

C. 0.2nm

D. 0.2pm

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!

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

A. arsenic

B. uranium

C. iodine

D. nickel

Correct! Wrong!

How many isotopes have odd atomic number ?

A. 154

B. 280

C. 86

D. 300

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!

Which of the following ion formation is always exothermic ?

A. Uni-negative

B. Uni-positive

C. Di-negative

D. Di-positive

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!

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!

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!

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!

Size of molecule depends upon________________?

A. Atomicity

B. Shape of molecule

C. Both A and B

D. Difficult to predict

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!

Molecular ions are formed by passing______________________?

A. High energy electron beam

B. ? – particle

C. X-rays

D. All of the above

Correct! Wrong!

The radioactive isotope of hydrogen is called___________?

A. tritium

B. deuterium

C. protium

D. ortho-hydrogen

Correct! Wrong!

Electron was discovered by?

A. Michael Faraday

B. James Maxwell

C. Yuri Gagarin

D. J.J Thomson

Correct! Wrong!

Empirical formula of chloroform is____________________?

A. CH2 C12

B. CH3C1

C. CC14

D. CHCL3

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!

Which of the following is a substance?

A. Sea water

B. Brass

C. Tape water

D. Graphite

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!

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!

Percentage of calcium in calcium carbonate is___________________?

A. 80%

B. 30%

C. 40%

D. 20%

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!

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!

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!

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

A. Paint

B. Glass

C. Gun Powder

D. Cement

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!

Which of the following is not a macromolecule ?

A. sand

B. haemoglobin

C. diamond

D. maltose

Correct! Wrong!

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

A. oxygen

B. carbon

C. tin

D. chlorine

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 one is true about isotope ?

A. Same number of neutrons

B. Same mass number

C. Same physical properties

D. Same chemical properties

Correct! Wrong!

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!

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!

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!

All of the following substances are crystalline except_____________?

A. Ice

B. Diamond

C. Sucrose

D. Plastic

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!

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!

INTERNATIONAL STUDENTS

PAKISTAN'S STUDENTS

Chemistry

Sodium carbonate is produced by____________?

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

The volume occupied by 2.8 g of N2 at STP______________________?

Diameter of an atom is in the order of________________?

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

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

How many isotopes have odd atomic number ?

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

Which of the following ion formation is always exothermic ?

One mole of CO2 contains?

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

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

Covalent network crystals have_____________?

Size of molecule depends upon________________?

Avogadros number may represent_________________?

Molecular ions are formed by passing______________________?

The radioactive isotope of hydrogen is called___________?

Electron was discovered by?

Empirical formula of chloroform is____________________?

Molecular mass of water (18g) means__________________?

Which of the following is a substance?

The mass of decimole of electrons (NA) is___________________?

Isotopes of the same elements has__________________?

Percentage of calcium in calcium carbonate is___________________?

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 ?

Which of the following statements about isotopes is correct ?

The soul of chemistry is dealing with___________?

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

Which of the following are isoelectronic species ?

Which of the following is not a macromolecule ?

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

The number of peaks obtained in mass spectrometry shows____________________?

Which one is true about isotope ?

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

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

1 a.m.u =__________________?

All of the following substances are crystalline except_____________?

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

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

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