The hydrated salt, Na_{2}SO_{4}.nH_{2}O, undergoes a 55% loss in mass on heating and becomes anhydrous. The value of n will be:

1. | 5 | 2. | 3 |

3. | 7 | 4. | 10 |

Subtopic: Empirical & Molecular Formula |

53%

From NCERT

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12 g of Mg (atomic mass = 24) will react completely with an acid to yield:

1. One mole of H_{2 }

2. A half mole of H_{2}

3. One mole of O_{2}

4. None of the above

Subtopic: Equation Based Problem |

69%

From NCERT

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The molality of a 15% (w/vol.) solution of H_{2}SO_{4} of density 1.1g/cm^{3} is-

1. 1.2

2. 1.4

3. 1.8

4. 1.6

Subtopic: Concentration Based Problem |

51%

From NCERT

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Which mode of expressing concentration is independent of temperature?

1. Molality

2. Percent by mass

3. Mole fraction

4. All of the above

Subtopic: Concentration Based Problem |

74%

From NCERT

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The product of atomic mass and specific heat of metal is approximately 6.4. This was given by:

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

Subtopic: Introduction |

65%

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A metal M forms a compound M_{2}HPO_{4}. The formula of the metal sulphate is:

1. M_{2}SO_{4}

2. MSO_{4}

3. M(SO_{4}${)}_{2}$

4. M_{2}(SO_{4})_{3}

Subtopic: Empirical & Molecular Formula |

62%

From NCERT

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A partially dried clay mineral contains 8% water. The original sample contained 12% water and 45% silica. The percentage of silica in the partially dried sample is nearly:

1. | 50% | 2. | 49% |

3. | 55% | 4. | 47% |

Subtopic: Concentration Based Problem |

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One litre N_{2}, 7/8 litre O_{2} and 1 litre CO are taken in a mixture under indentical conditions of P and T. The amount of gases present in mixture is given by:

1. ${\mathrm{\omega}}_{{\mathrm{N}}_{2}}={\mathrm{\omega}}_{{\mathrm{O}}_{2}}>{\mathrm{\omega}}_{\mathrm{CO}}$

2. ${\mathrm{\omega}}_{{\mathrm{N}}_{2}}={\mathrm{\omega}}_{\mathrm{CO}}>{\mathrm{\omega}}_{{\mathrm{O}}_{2}}$

3. ${\mathrm{\omega}}_{{\mathrm{N}}_{2}}={\mathrm{\omega}}_{{\mathrm{O}}_{2}}={\mathrm{\omega}}_{\mathrm{CO}}$

4. ${\mathrm{\omega}}_{\mathrm{CO}}>{\mathrm{\omega}}_{{\mathrm{N}}_{2}}>{\mathrm{\omega}}_{{\mathrm{O}}_{2}}$

Subtopic: Moles, Atoms & Electrons |

51%

From NCERT

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Equal volumes of 0.1 M AgNO_{3} and 0.2 M NaCl are mixed. The concentration of N${\mathrm{O}}_{3}^{-}$ ions in the mixture will be:

1. | 0.1M | 2. | 0.05M |

3. | 0.2M | 4. | 0.15M |

Subtopic: Concentration Based Problem |

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A solution contains Na_{2}CO_{3} and NaHCO_{3}. 10 mL of the solution required 2.5 mL of 0.1 M H_{2}SO_{4} for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H_{2}SO_{4} was required. The amount of Na_{2}CO_{3} and NaHCO_{3} in 1 litre of the solution is:

1. 5.3g and 4.2g

2. 3.3g and 6.2g

3. 4.2g and 5.3g

4. 6.2g and 3.3g

Subtopic: Millimole/Equivalent Concept |

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