Identify the incorrect unit conversion factor.
A. 1 cm3 / 1 m L B. 1 cm / 10 mm C. 60 s / 1 min D.... View Article
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Identify and pick the incorrect statement.
A. The constituents of a compound cannot be separated into simpler substances by physical methods. B. An element consists of... View Article
How many moles of electron weight one kilogram?
A. 6.023 × 1023 B. 1 / 9.108 × 1023 C. 6.023 / 9.108 × 1054 D. 1 / 9.108... View Article
In the standardisation of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is;
A. (molecular weight) / 2 B. (molecular weight) / 6 C. (molecular weight) / 3 D. same as molecular weight... View Article
In an organic compound of molar mass 108 g mol-1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. The molecular formula can be;
A. C6H8N2 B. C7H10N C. C5H6N3 D. C4H18N3 Solution: (A) Given, Molar mass = 108 g/mol. Therefore, The mass of... View Article
A gaseous mixture contains CH4 and C2H6 in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is:
A. 3 g B. 4.6 g C. 1.6 g D. 2.3 g Solution: (D) Mol wt of CH4 = 16... View Article
An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 mL. The volume of 0.1 N NaOH required to completely neutralize 10 mL of this solution is:
A. 40 mL B. 20 mL C. 10 mL D. 4 mL Solution: (A) n-factor for H2C2O4.2H2O = 2 Normality... View Article
100 mL of 0.1N hypo decolourized iodine by the addition of x g of crystal copper sulphate to an excess of KI. The value of x is:
A. 5.0 g B. 1.25 g C. 2.5 g D. 4 g Solution: (C) Let us first find the valence... View Article
n g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as X + Y = R + S. The relation which can be established in the amounts of the reactants and the products will be:
A. n − m = p − q B. n + m = p + q C. n = m... View Article
If the density of water is 1 g cm−3 then the volume occupied by one molecule of water is approximately;
A. 18 cm3 B. 22400 cm3 C. 6.02 × 10−23 cm3 D. 3.0 × 10−23 cm3 Solution: (D) We know,... View Article
3.92 g of ferrous ammonium sulphate crystal are dissolved in 100 mL of water, 20 mL of this solution requires 18mL of potassium permanganate during titration for complete oxidation. The weight of KMnO4 present in one litre of the solution is:
A. 34.76 g B. 12.38 g C. 1.238 g D. 3.476 g Solution: (D) Molecular weight of Ferrous ammonium sulphate... View Article
2.6 g of a mixture of calcium carbonate and magnesium carbonate is strongly heated to the constant weight of 1.3 g. The atomic weights of calcium and magnesium are 40 and 24 respectively. State which of the following weights expresses the weight of calcium carbonate in the original mixture?
A. 980 mg B. 400 mg C. 1.75 g D. 0.74 g Solution: (D) Let the weight of CaCO3 in... View Article
4.0g of caustic soda (molmass40) contains the same number of sodium ions as present in?
A. 10.6 g of Na2CO3 (mol.mass 106) B. 58.5g of NaCl (formula mass 58.5) C. 100ml of 0.5MNa2SO4 (formula mass... View Article
If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is;
A. 1.032 × 1022 B. 3.01 × 1022 C. 5.88 × 1023 D. 6.02 × 1023 Solution: (A) 1 mole... View Article
If 224 mL of a triatomic gas has a mass of 1 g at 273 K and 1 atm pressure, then the mass of one atom is;
A. 8.30 × 0−23 g B. 6.24 × 10−23 g C. 2.08 × 10−23 g D. 5.54 × 10−23 g... View Article
Among the following pairs of compounds, the one that illustrates the law of multiple proportions is:
A. NH3 and NCl3 B. H2S and SO2 C. CuO and Cu2O D. CS2 and FeSO4 Solution: (C) If we... View Article
Assuming fully decomposed, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (Atomic mass of Ba = 137) will be _____.
A. 0.84 L B. 2.24 L C. 4.06 L D. 1.12 L Solution: (D) BaCO3 → BaO + CO2↑ Molecular... View Article
The amount of zinc required to produce 224 mL of H2 at STP on treatment with dilute H2SO4 will be;
A. 65 g B. 0.065 g C. 0.65 g D. 6.5 g Solution: () The reaction between zinc with sulfuric... View Article
Dimensions of pressure are same as that of;
A. Energy B. Energy per unit volume C. Force D. Force per unit volume Solution: (B) Dimension of Pressure, Pressure... View Article
Two containers P and Q of equal volume (1 litre each) contain 6 g of O2 and SO2 respectively at 300 K and 1 atmosphere, then;
A. Number of molecules in P is less than that in Q B. Number of molecules in P and Q... View Article
