Olympiad – Class IX – Science - Che - Atoms and Molecules

Buy Olympiad -IX Standard Practice test pack

Question - 1

Identify the symbols of lead and mercury respectively

  • A Hg, Pb
  • B Pb, Hg
  • C Le, Me
  • D Ld, My

Question - 2

What is the weight of 3 gram atoms of sulphur?

  • A \({ 96 }_{ g }\)
  • B \(99_{ g }\)
  • C \(100_{ g }\)
  • D \(3_{ g }\)

Question - 3

How many moles of oxygen atoms are present in one mole of acetic acid?

  • A 1 mole
  • B 3 moles
  • C 2 moles
  • D 6 moles

Question - 4

Calculate the weight in grams present in 0.7 moles of sodium.

  • A \({ 16.1 }_{ g }\)
  • B \({ 16.2 }_{ g }\)
  • C \({ 16.3 }_{ g }\)
  • D \(0.161_{ g }\)

Question - 5

How many gram atoms and atoms are there in 10 grams of calcium?

  • A 0.25 gram atoms, 6.023 x 10-23atoms
  • B 0.25 gram atoms, 1.50 x 1023atoms
  • C 0.1 gram atoms, 6.023 x 1023atoms
  • D 0.1 gram atoms, 1.50 x 1023atoms

Question - 6

How many moles are present in 540 g of glucose\({ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }\) ?

  • A 2 moles
  • B 3 moles
  • C 4 moles
  • D 1 mole

Question - 7

How much lime is obtained by burning 400g of lime stone?

  • A 224 g
  • B 400 g
  • C 220 g
  • D 320 g

Question - 8

The approximate production of sodium carbonate per month is 424 x \({ 10 }^{ 6 }\)g while that of methyl alcohol is 320x \({ 10 }^{ 6 }\)g Which of the following is produced more in terms of number of moles?

  • A Sodium carbonate
  • B Methyl alcohol
  • C Both (A) and (B)
  • D Data insufficient

Question - 9

Calculate the weight of 3.0 moles of \(KC/{ O }_{ 3 }\)

  • A 245 g
  • B 249 g
  • C 367.5 g
  • D 24.5 g

Question - 10

Identify the correct increasing order of molecular weights of the given compounds.

  • A \({ H }_{ 2 }O>{ H }_{ 2 }S>{ CO }_{ 2 }>{ SO }_{ 2 }\)
  • B \({ H }_{ 2 }O>{ H }_{ 2 }S<{ CO }_{ 2 }>{ SO }_{ 2 }\)
  • C \({ H }_{ 2 }O<{ H }_{ 2 }S<{ CO }_{ 2 }<{ SO }_{ 2 }\)
  • D \({ H }_{ 2 }O>{ H }_{ 2 }S>{ CO }_{ 2 }<{ SO }_{ 2 }\)