An element X has the following isotopic composition:
200X : 90%, 199X : 8.0%, 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to
1. 201 u
2. 202 u
3. 199 u
4. 200 u
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology0.24g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance?
(Density of H2 = 0.089)
1. 95.93
2. 59.93
3. 95.39
4. 5.993
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe hydrated salt, Na2SO4.nH2O, 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology12 g of Mg (atomic mass = 24) will react completely with an acid to give:
1. One mole of H2
2. Half mole of H2
3. One mole of O2
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe molality of a 15% (w/vol.) solution of H2SO4 of density 1.1g/cm3 is-
1. 1.2
2. 1.4
3. 1.8
4. 1.6
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich mode of expressing concentration is independent of temperature?
1. Molality
2. Percent by mass
3. Mole fraction
4. All of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA metal M forms a compound M2HPO4. The formula of the metal sulfate is:
1. M2SO4
2. MSO4
3. M(SO4
4. M2(SO4)3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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%
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOne litre N2, 7/8 litre O2 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.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology