The equation for the preparation of nitrogen monoxide is:a Cu + b HNO3 ------- a Cu (NO3)2 + c H2O + 2NOWhat is the value of b? Answer: 18) D…

Which of the four statements below about natural selection are correct?1 Competition occurs between individuals of the same species.2 Competition occurs between individuals of different species.3 Selection can lead to…

Evaluate: Answer: 16) F Let us break down such a complicated problem into smaller parts. (2 x 10³) = 2000(8 x 10²) = 800 So, (2 x 10³) + (8…

The graph represents the motion of a vehicle during part of a journey. What is the best estimate of the distance travelled during the part of the journey shown? Answer:…

The order of reactivity of four elements is J>M>Q>T i.e. J is the most reactive and T the leastreactive. A series of reactions are given below: Which three reactions could…

Which one of the following movements will be severely and immediately disrupted if the oxygenconcentration in the blood becomes very low? Answer: 13) B The key to solve this question…

The symbol ⟐ defines a mathematical binary operation such that y ⟐ x =x y^xfor all positive integers.What is the value of (2 ⟐ 3) ⟐ 2? Answer: 12) C…

It is known that a radioactive source emits a single type of radiation. Detectors are placed in the two positions shown. The graph shows how the readings change over time.…

2.00g of a carbon compound is burnt in excess oxygen.4.77g of carbon dioxide is produced.What percentage (to the nearest 1%) of carbon is in the original compound? A 21%B 26%C…

The data below considers the risk of having a cancer in the neck region due to drinking alcoholand one genetic factor (presence of a mutant allele for the CYP1A1 gene).…