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%
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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 & BiologyEqual volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of N ions in the mixture will be:
1. 0.1M
2. 0.05M
3. 0.2M
4. 0.15M
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA solution contains Na2CO3 and NaHCO3. 10 mL of the solution required 2.5 mL of 0.1 M H2SO4 for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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-
1.6.5
2.6.9
3. 7.6
4. 7.9
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOne mole of a mixture of CO and CO2 requires exactly 20g of NaOH in solution for the complete conversion of all the CO2 into Na2CO3. How much NaOH would it require for conversion into Na2CO3, if the mixture (one mole) is completely oxidised to CO2?
1. 60g
2. 80g
3. 40g
4. 20g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyVersene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:
1. 100 mg
2. 163 mg
3. 200 mg
4. 263 mg
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA gas is found to have the formula (CO)x. Its VD is 70. The value of x must be:
1. 7
2. 4
3. 5
4. 6
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen 100 mL of PH3 is decomposed, it produces phosphorus and hydrogen. The change in volume is
1. 50 mL increase
2. 500 mL decrease
3. 900 mL decrease
4. none of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe molality of 1M solution of NaCl ( specific gravity 1.0585 g/mL ) is:
1. 1.0585
2. 1.0
3. 0.10
4. 0.0585
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology