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The formulae of four organic compounds are shown below. Choose the correct option:
The correct answer is [C]. The reaction that converts alkenes into alkanes is called hydrogenation. In this process, hydrogen gas (H₂) is added to the carbon–carbon double bond of the alkene, converting it into a single bond, thereby forming an alkane. For hydrogenation to occur, specific conditionsRead more
The correct answer is [C]. The reaction that converts alkenes into alkanes is called hydrogenation. In this process, hydrogen gas (H₂) is added to the carbon–carbon double bond of the alkene, converting it into a single bond, thereby forming an alkane. For hydrogenation to occur, specific conditions are required: a metallic catalyst, usually nickel (Ni), must be present to speed up the reaction, and the reaction temperature should be maintained around 423 K. This process is widely used in the food and chemical industries.
See lessTake about 1-gram solid NaCl in a clean and dry test tube and set up the apparatus as shown in figure. Now, say that – (If climate is humid the gas evolved is passed through a guard tube containing):
ANSWER: [D] Explanation: During the preparation of hydrogen chloride gas, the gas is usually passed through the guard tube containing calcium chloride during humid climate, as calcium chloride is a good drying agent and absorbs moisture from the gas.
ANSWER: [D]
Explanation: During the preparation of hydrogen chloride gas, the gas is usually passed through the guard tube containing calcium chloride during humid climate, as calcium chloride is a good drying agent and absorbs moisture from the gas.
See lessThe plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is:
ANSWER: [D] Explanation: Auxins are plant hormones that accumulate on the shaded side of the shoot when exposed to light. This higher concentration stimulates cells on the dark side to elongate more, causing the shoot to bend towards the light. This response is called phototropism. Cytokinins → promRead more
ANSWER: [D]
Explanation: Auxins are plant hormones that accumulate on the shaded side of the shoot when exposed to light. This higher concentration stimulates cells on the dark side to elongate more, causing the shoot to bend towards the light. This response is called phototropism.
Hence, the bending of shoots towards light is controlled by auxins.
See lessWhich are the correct statements regarding ozone depletion? (i) Chlorofluorocarbons (CFCs) are the main cause of ozone depletion. (ii) Ozone depletion increases harmful ultraviolet radiation reaching earth. (iii) Ozone hole is prominently observed over Antarctica. (iv) Ozone depletion protects humans from global warming.
ANSWER: (A) Explanation: Ozone depletion is mainly caused by chlorofluorocarbons (CFCs) from refrigerants, air-conditioners, and aerosols. CFCs release chlorine that destroys ozone molecules, thinning the protective layer. This allows harmful ultraviolet rays to reach Earth, causing skin cancer, catRead more
ANSWER: (A)
Explanation: Ozone depletion is mainly caused by chlorofluorocarbons (CFCs) from refrigerants, air-conditioners, and aerosols. CFCs release chlorine that destroys ozone molecules, thinning the protective layer. This allows harmful ultraviolet rays to reach Earth, causing skin cancer, cataracts, and crop damage. The ozone hole, seen prominently over Antarctica, highlights this issue. Ozone depletion differs from global warming, which concerns heat retention.
See lessIf pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds developed by the plants of F1 generation will be: (A) 50% round and green (B) 75% wrinkled and green (C) 100% round and yellow (D) 75% wrinkled and yellow
ANSWER: (C) Explanation: Parent cross: RRyy × rrYY Gametes: R y (from RRyy) and r Y (from rrYY) F₁ genotype: RrYy (all offspring same) Traits: R (round) is dominant over r (wrinkled). Y (yellow) is dominant over y (green). So, all F₁ seeds will show round and yellow phenotype. Thus, the plants of F₁Read more
ANSWER: (C)
Explanation:
Traits:
So, all F₁ seeds will show round and yellow phenotype. Thus, the plants of F₁ generation will produce 100% round and yellow seeds.
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