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125 mL of 63% (w/v) H2C2O4 ⋅2H2O solution is made to react with 125 mL of a 40%(w/v) NaOH solution. The resulting solution is: (a) Neutral (b) Acidic (c) Strongly acidic (d) Alkaline

Solution: (a) Given 125 mL of 63% (w/v) H2C2O4 ⋅2H2O solution. Concentration (Normality )of H2C2O4 ⋅2H2O is N = (w/eq.W ) x 1000/v(ml) Weight... View Article

The major binding force of diamond, silicon and quartz is (a) Electrostatic force (b) Electrical attraction (c) Covalent bond force (d) Non covalent force (e) Van der Waals forces

Solution (c) The major binding force of diamond, silicon and quartz is covalent bond force. Diamond is a covalent solid. It is a big giant... View Article

The hybridization of atomic orbitals of nitrogen in NO2+, NO3− and NH4+are

Solution: Steric number = number of atom bonded + lone pair of electrons (i) Hybridisation of N in NO2+ is: In NO2+ outer most valence... View Article

A cheap, conventional, commercial and inexhaustible source of energy is: (a) Hydropower (b) Solar energy (c) Wind energy (d) Thermal energy

Solution: (a) Flowing water creates energy that can be captured and turned into electricity. This is called hydroelectric power or hydropower.... View Article

Sulphur dioxide is a/an (a) basic oxide (b) acidic oxide (c) neutral oxide (d) amphoteric oxide

Solution:(b) SO2 is acidic in nature. All non-metallic oxides are acidic in nature because they react with water to produce corresponding... View Article

The products formed in the hydrolysis of ICl are: (A) HI+HCl (B) HI+HOCl (C) HCl+HOI (D) HOCl+HOI

Solution:(c) ICl + H2O → HCl + HOI In the hydrolysis of ICl, the products are HCl + HOI. During the hydrolysis of interhalogen compounds,... View Article

Which of the following compounds would have the smallest value for pka ? (a) CHF2CH2CH2COOH (b) CH3CH2CF2COOH (c) CH2FCHFCH2COOH (d) CH3CF2CH2COOH

Solution:(b) The compounds having more acidic strength have less pKa value. −F is a strong electron withdrawing group. More number of electron... View Article

Which among the following compounds does not undergo hydrolysis? (I)TeF6 (II)SF6 (III)NCl3 (IV)NF3

(I) TeF6 is hydrolysed to form H6TeO6 TeF6 + 6H2O → 6HF + H6TeO6 (II) SF6 atom is sterically protected by six F atoms and does not allow water... View Article

Gaseous mixture of H2 and NH3 gas contains 68 mass % of NH3. The vapour density of the mixture is

Solution: We know that: vapour density =½ Mavg Mavg = total mass/ total moles mass of NH3 = 68 % = 68 gm ∴ mass of H2 =100−68= 32 gm moles... View Article

If a 6.84% (wt/vol.) solution of cane sugar (mol. wt = 342) is isotonic with 1.52% (wt/vol.) solution of thiocarbamide, then the molecular weight of thiocarbamide is

Solution: Given 6.84% (wt/vol.) solution of cane sugar means, weight of cane sugar = 6.84gm Volume = 100 ml Molecular weight of... View Article

If excess of AgNO3 solution is added to 100 mL of a 0.024 M solution of dichlorobis (enthylenediamine) cobalt (III) chloride, how many moles of AgCl be precipitated?

Solution: The name of complex is dichlorobis (ethylenediamine) cobalt (III) chloride The oxidation state of cobalt is +3 Net charge on... View Article

Which of the following overlapping is not present in XeO3 molecule? (a) sp3+ px (b) sp3 + py (c) sp3 + pz (d) sp3 + s

Ans:(d) sp3+ s In XeO3, Ground state of electronic configuration Xe = [Kr] 4d10 5s2 5p6 Excited state of electronic configuration Xe = [Kr]... View Article

Which of the following are basic oxides? Mn2O7,V2O3, V2O5, Cr2O3,CrO

Metal oxides in lowest oxidation states are more basic. On moving along a period,the metallic character decreases. So the basic character of... View Article

Observe the number line given below and answer the questions. On jumping 4 units to the right of -2, we land at what point?

Clearly we can see from the figure given below, on jumping 4 units to the right of -2, we land at point 2.... View Article

A tower stands vertically on the ground. From a point on the ground which is 20 m away from the foot of the tower is found to be 60º. The height of the tower is:

Here, AB is the height of a tower. CB=20m Now, tan 60 = AB/CB √3 = AB/20 AB = 20√3 Therefore, the... View Article

ABCD is an isosceles trapezium. if AB || CD, AB = 20 cm, CD = 10 cm and each of the non-parallel sides is 13 cm, then area of trapezium is

Given, ABCD is an isosceles trapezium. AB || CD AB = 20 cm CD = 10 cm Length of each leg of trapezium = 13 cm By the formula, the... View Article

S is a point on the side QR of triangle PQR such that PS is the bisector of angle QPR. then: A. QS = SR B. QP > QS C. QS > QP D. SR > RP

Answer: B. QP > QS According to the given condition, ∠QPS=∠RPS By external angle theorem, ∠PSQ=∠RPS+∠PRS... View Article

If P is a point lying on the line segment joining Q(1, 1) and R(4, 1) such that PQ = 3/7 QR, then find the coordinates of P.

Using section formula, if a point (x,y) divides the line joining the points (x1, y1) and (x2, y2) in the ratio m:n, then; Given, PQ = 3/7 QR... View Article

Find the equation of the parabola with vertex at the origin and focus at f(-2, 0).

General equation of parabola, y2 = -4ax Focus (-a, 0) = (-2, 0) a = 2 y2 = -4(2)x = -8x Therefore, the equation of parabola with... View Article

Find the number of digits in the square roots of 1764.

Square root of 1764 = √(2 x 2 x 3 x 3 x 7 x 7) = 2 x 3 x 7 = 42 Thus, there are two digits in square root of 1764.... View Article

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