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In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide in the balanced equation is (1) 1 (2) 2 (3) 3 (4) 4

Answer: (4) 4 A decomposition reaction can be characterized as a type of chemical reaction in which one single compound... View Article

The electrolytic decomposition of water gives H₂ and O₂ in the ratio of (1) 1: 2 by volume (2) 2: 1 by volume (3) 8: 1 by mass (4) 1: 2 by mass

Answer: (2) 2 : 1 by volume The number of molecules formed by hydrogen is twice the number of molecules... View Article

Which of the following gases can be used for storage of fresh sample of oil for a long time? (1) Carbon dioxide or oxygen (2) Nitrogen or oxygen (3) Carbon dioxide or helium (4) Helium or nitrogen

The correct answer is (4) Helium or nitrogen Reason Oxygen acts as an oxidizing agent. Nitrogen is less reactive than... View Article

The chemical formula of lead sulphate is (1) Pb₂SO₄ (2) Pb (SO₄)₂ (3) PbSO₄ (4) Pb₂(SO₄)₃

Answer:(3) PbSO4 A lead sulphate is a white solid that is crystalline in nature, it is a compound that does... View Article

Give reasons why plant and animals depend on each other?

Answer: For their nutrition, plants absorb decayed matter from the soil and are eaten for their survival by plant-eating animals.... View Article

One lakh eight thousand how can right in numbers?

Answer: 1,08,000 In the Indian numbering system, the term lakh and crore are expressed as 1 lakh = 1,00,000 1... View Article

The reciprocal of 1 is ___________?

Answer: The reciprocal of 1 is 1. Reciprocal A Reciprocal is described as the inverse of a value or a... View Article

What is the taste of lemon, sugar, curd, lime, baking soda, amla, tamarind, raw mango, pomegranate, water?

Answer: Lemon – The lemon contains citric acid juice of about 5 to 6 percent, with a pH of about... View Article

Prove that (sec A + tan A) (1 – sin A) = cos A

Answer: To prove (sec A + tan A) (1 – sin A) = cos A \(\begin{array}{l}sec A = \frac{1}{cos A}\end{array}... View Article

Each edge of a cube is increased by 50%. Find the percentage increase in the surface area of the cube.

Answer: Let x be the edge of a cube.Surface area of the cube having edge x = 6x2 ………..(1) As... View Article

Give some examples of each monocot and dicot seeds.

Answer: Monocotyledon is a classification of flowering plants, it is characterized by only one embryonic leaf. Examples: Corn Wheat Maize... View Article

Choose the forms in which most plants absorb nitrogen (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen. Choose: (1) (i) and (ii) (2) (ii) and (iii) (3) (iii) and (iv) (4) (i) and (iv)

Answer: (2) (ii) and (iii) Nitrogen is an essential nutrient for plant growth, development, and reproduction. The biological method occurs in... View Article

The resistance to fatigue of a material is measured by (1) Elastic limit (2) Ultimate tensile strength (3) Young’s modulus (4) Endurance limit.

Answer: The resistance of a material to fatigue is measured by the endurance limit. The fatigue of a substance is... View Article

Which one of the following soil ideal for growing cotton (1) regular soil (2) laterite soil (3) desert soil (4) mountainous soil

Answer: (2) laterite soil Laterite soil are soft, when they are wet and ‘hard and cloddy’ on drying. These are... View Article

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