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At STP, the density of CCl₄ vapour in g/L will be nearest to;

A. 6.87 B. 3.42 C. 10.26 D. 4.57 Solution: (A) As per Avogadro’s law, 1 mole of every substance will occupy 22.4 liters at STP and it... View Article

What is the normality of 0.3 M phosphorous acid:

A. 0.1 B. 0.9 C. 0.3 D. 0.6 Solution: (D) Phosphorous acid is a type of an ibasic acid because it has 2 replaceable H atoms.... View Article

Boron has two stable isotopes, ¹⁰B(19%) and ¹¹B(81%). Calculate the average atomic weight of boron in the periodic table.

A. 10.8 B. 10.2 C. 11.2 D. 10.0 Solution: (B) Average atomic weight = ∑% abundant × atomic mass / 100 = (19 × 10) +... View Article

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15°C and 150 mmHg pressure! one litre of O₂ contains ‘N’ molecules. The number of molecules in two litres of SO₂ under the same conditions of temperature and pressure will be:

A. N/2 B. N C. 2N D. 4N Solution: (C) If we recall Avogadro's law it states, equal volumes of all gases contain equal number of molecules under... View Article

The same amount of Zinc is treated separately with an excess sulphuric acid and excess sodium hydroxide. What will be the ratio of volumes of hydrogen evolved?

A. 1 : 1 B. 1 : 2 C. 2 : 1 D. 9 : 4 Solution: (A) Zinc reacts with excess of NaOH as; Zn + 2NaOH → Na2ZnO2 + H2 Zinc reacts... View Article

The number of oxygen atoms in 4.4 g of CO₂ is

A. 1.2 x 1023 B. 6 x 1022 C. 6 x 1023 D. 12 x 1023 Solution: (A) Moles of CO2 = 4.4 / 44 = 0.1 moles ∴ Number of molecules of... View Article

How many significant digits are there in 0.25?

A. 1 B. 2 C. 3 D. Cannot be determined Solution: (B) The number 0.20 is precise to 2 significant figures The zero is significant if it... View Article

Volume occupied by one molecule of water (density 1 g cm^-3) is:

A. 3.0 × 10-23 cm3 B. 5.5 × 10-23 cm3 C. 9.0 × 10-23 cm3 D. 6.023 × 10-23 cm3 Solution: (A) Mass of one... View Article

The drug which is used for treating AIDS victims is;

A. Azidothymidine B. Cis-platin C. Taxol D. All of them Solution: (A) Azidothymidine (AZT) which is a type of antiretroviral medication... View Article

The number of atoms in 0.1 mole of a triatomic gas is (N_A = 6.023 × 10²³mol⁻¹).

A. 6. 026 × 1022 B. 1. 806 × 1023 C. 3. 600 × 1023 D. 1. 800 × 1022 Solution: (B) No. of atoms = NA x No. of... View Article

In the final answer of the expression (29.2 − 20.2) (1.79 × 10⁵) / 1.37 the number of significant figures is.

A. 1 B. 2 C. 3 D. 4 If we do the calculation we will get; (29.2 − 20.2) (1.79 × 105) / 1.37 = 1.17 × 106 We will find... View Article

Which has the maximum number of atoms?

A. 24 g of C (12) B. 56 g of Fe (56) C. 27 g of A1 (27) D. 108 g of Ag (108) Solution: (A) Number of atoms = Number of moles ×... View Article

1 L oxygen gas at STP will weigh:

A. 1.43 g B. 2.24 g C. 11.2 g D. 22.4g Solution: (A) 22.4L O2 at S.T.P. = 32 gm of O2 1L O2 at S.T.P. = 32 / 22.4 = 1.43 gm of O2... View Article

The percentage weight of Zn in white vitriol [ZnSO₄.7H₂O] is approximately equal to. (at.mass o fZn = 65,S = 32,0 = 16 and H = 1).

A. 33.65 B. 32.56 C. 23.65 D. 22.65 Solution: (D) The molecular weight of white vitriol ZnSO4.7H2O = 65 + 32 + (4 × 16) + 7(2... View Article

In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO₃, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine):

A. X2Cl B. X2Cl2 C. XCl2 D. XCL4 Solution: (C) Millimoles of solution of chloride = 0.05 x 10 = 0.5 Millimoles of AgNO3 solution... View Article

Kamlang Tiger Reserve

Tiger Reserves are statutorily designated areas aimed at conserving tigers and ensuring their viable population. The Tiger Reserves in India are... View Article

National Sports Awards List 2022

There are multiple National Sports Awards in India which are awarded to sportspersons for their contribution and bringing pride to the country at... View Article

What is Air Bubble Agreement?

Transportation bubbles or air travel arrangements were temporary arrangements between two countries meant to resume commercial passenger... View Article

The equation (a² + b²)x² – 2b (a + c)x + (b² + c²) = 0 has equal roots. Which one of the following is correct about a, b, and c?

(a) They are in AP (b) They are in GP (c) They are in HP (d) They are neither in AP, nor in GP, nor in HP Solution: (a2 + b2)x2 - 2b (a... View Article

[latex]sum_{k=1}^{n}k(1 + frac{1}{n})^{k-1}[/latex]

(a) n(n - 1) (b) n(n + 1) (c) n2 (d) (n + 1)2 Solution: Sn = 1(1+ 1/n)0 + 2(1 + 1/n)1 + 3(1 + 1/n)2 + …n(1+1/n)n-1... View Article