Archives

Which of the following sample(s) must have an average molar mass greater than that of a mixture of N2 and CO2?

A. Pure O3 B. Pure Ne C. Mixture of SO2 and SO3 D. Mixture of CH4 and SO3 Solution: (D) The mixture of CH4 and SO3 will have an average molar... View Article

Arrange the following hydrides of Group-16 elements in the increasing order of their thermal stability: H2O, H2S, H2Se, H2Te

H2O, H2S, H2Se, H2Te Solution: Considering the condition that stability of hydrides of group-16 decreases down the group we can say that the... View Article

Which reaction does not represent auto redox or disproportionation?

A. Cl2 + OH- → Cl- + ClO3- + H2O B. 2H2O2 → 2H2O + O2 C. 2Cu+ → Cu2+ + Cu D. (NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O Solution: (D) If we recall the... View Article

What is the amount of work done when 0.5 moles of methane, CH4(g), is subjected to combustion at 300 K?

A. −2494J B. −4988J C. +4988J D. +2494J Solution: (D) Let us balance the chemical equation for combustion reaction; CH4(g) + 2O2(g) →... View Article

The rate equation for the reaction A + B → P is rate = k[A]½ [B]2. What is the order of reaction

Solution: (2.5) For A + B → P r = k[A]½ [B]2 The order of the reaction = 2 + 1/2 = 5/2 = 2.5... View Article

When Mn(OH)2 is made by adding an alkali to a solution containing Mn2+ ions, the precipitate quickly darkens, and eventually goes black. What might be the chemical giving black colour

A. Mn2O3 B. MnO2 C. Mn2O5 D. None of these Solution: (B) Mn(OH)2 is oxidized by oxygen in the air to form MnO2 which eventually goes black.... View Article

Among the following compounds, the number of compounds that do not produce acidic or basic solutions when dissolved in water is

NaCl, BeCl2, BaCl2, Li2O, MgO, CaH2, CaSO4. Solution: (3) The compounds are; Magnesium Oxide (MgO) will react with water to form Magnesium... View Article

For the cell reaction: 4Br− + O2 + 4H+ ⇌ 2Br2 + 2H2O; E∘ = 0.18V. The value of (log KC) at 298 K is [2.303 RT / F = 0.06]

A. 12 B. 6 C. 18 D. 3 Solution: (A) From the question; E0 = 0.18V 2.303RT/F = 0.06 Cell reaction: 4Br− + O2 + 4H+ ⇌ 2Br2 + 2H2O Let us... View Article

The ratio of (E2 − E1) to (E4 − E3) for the hydrogen atom is approximately equal to

A. 10 B. 15 C. 17 D. 12 Solution: (B) In hydrogen atom formula for energy is E = −13.6 × z2 / n2, Where, z = Atomic number, n = Principle... View Article

What is common between P4O6 and P4O10?

A. sp3 hybridized B. p – o – p bond C. Acidic Oxide D. All of these Solution: (D) The common features of P4O6 and P4O10: - Both have closed... View Article

The unit cell of aluminium is a cube with an edge length of 405 pm. The density of aluminium is 2.70 g cm−3. What is the structure of the unit cell of aluminium

A. Body-centered cubic cell B. Face-centred cubic cell C. End-centered cubic cell D. Simple cubic cell Solution: (B) Density of crystal, ρ =... View Article

In Kjeldahl’s method, ammonia from 5 g of good neutralizes 30 cm2 of 0.1 N acid. The percentage of nitrogen in the food is

A. 0.84 B. 8.4 C. 16.8 D. 1.68 Solution: (A) From Kjeldahl's method, the percentage of nitrogen = 1.0 × N × V / w = 1.4 × 0.1 × 30 / 5 = 0.84%... View Article

Bond order normally gives an idea of the stability of a molecular species. All the molecules viz. H2, Li2 and B2 have the same bond order yet they are not equally stable. Their stability order is:

A. H2 > B2 > Li2 B. H2 > Li2 > B2 C. Li2 > B2 > H2 D. B2 > H2 > Li2 Solution: (A) The configuration of the three... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28

Archives

Which of the following sample(s) must have an average molar mass greater than that of a mixture of N2 and CO2?

Arrange the following hydrides of Group-16 elements in the increasing order of their thermal stability: H2O, H2S, H2Se, H2Te

Which reaction does not represent auto redox or disproportionation?

What is the amount of work done when 0.5 moles of methane, CH4(g), is subjected to combustion at 300 K?

The rate equation for the reaction A + B → P is rate = k[A]½ [B]2. What is the order of reaction

When Mn(OH)2 is made by adding an alkali to a solution containing Mn2+ ions, the precipitate quickly darkens, and eventually goes black. What might be the chemical giving black colour

Among the following compounds, the number of compounds that do not produce acidic or basic solutions when dissolved in water is

For the cell reaction: 4Br− + O2 + 4H+ ⇌ 2Br2 + 2H2O; E∘ = 0.18V. The value of (log KC) at 298 K is [2.303 RT / F = 0.06]

The ratio of (E2 − E1) to (E4 − E3) for the hydrogen atom is approximately equal to

What is common between P4O6 and P4O10?

The unit cell of aluminium is a cube with an edge length of 405 pm. The density of aluminium is 2.70 g cm−3. What is the structure of the unit cell of aluminium

In Kjeldahl’s method, ammonia from 5 g of good neutralizes 30 cm2 of 0.1 N acid. The percentage of nitrogen in the food is

1 M NaOH solution was slowly added into 1000 mL of 183.75 g impure H2SO4 solution and the following plot was obtained

Which one of the following groupings represents a collection of isoelectronic species? (At. nos.: Cs = 55, Br = 35)

The correct IUPAC name of BR is

The litmus solution when shaken with charcoal becomes colourless. Explain

Volume of O2 liberated at STP by 100 ml of 10 volume H2O2 solution is

The pressure of sodium vapour in a 1.0 L container is 10 torr at 1000 oC. How many atoms are in the container

The precipitate of Ag2CrO4 (Ksp = 1.9 x 10-12) is obtained when equal volumes of the following are mixed

Bond order normally gives an idea of the stability of a molecular species. All the molecules viz. H2, Li2 and B2 have the same bond order yet they are not equally stable. Their stability order is:

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