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 |

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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

69%

Subtopic: Introduction |

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

1. M_{2}SO_{4}

2. MSO_{4}

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

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

Subtopic: Empirical & Molecular Formula |

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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 |

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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

From NCERT

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: Equivalent Concept |

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A sample of pure Cu (3.18g ) heated in a stream of oxygen for some time gains in mass with the formation of black oxide of copper (CuO). The final mass is 3.92 g. The percent of copper remains unoxidised is-

1.$\approx $6.5

2.$\approx $6.9

3. $\approx $7.6

4. $\approx $7.9

From NCERT

Subtopic: Equation Based Problem |

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One mole of a mixture of CO and CO_{2} requires exactly 20g of NaOH in solution for the complete conversion of all the CO_{2} into Na_{2}CO_{3}. How much NaOH would it require for conversion into Na_{2}CO_{3}, if the mixture (one mole) is completely oxidised to CO_{2}?

1. 60g

2. 80g

3. 40g

4. 20g

Subtopic: Equation Based Problem |

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Versene, a chelating agent having chemical formula C_{2}H_{4}N_{2}(C_{2}H_{2}O_{2}Na)_{4}. If each mole of this compound could bind 1 mole of Ca^{2+}, then the rating of pure versene expressed as mg of CaCO_{3} bound per g of chelating agent is:

1. 100 mg

2. 163 mg

3. 200 mg

4. 263 mg

Subtopic: Equation Based Problem |

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