Carbon and its Compounds — Science STD 10 — Question

How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.

What is nuclear fusion? Explain with an example. Write the equation of the reaction involved.

Name two oxidising agents that are used for the conversion of alcohols to acids. Distinguish between ethanol and ethanoic acid on the basis of,

1. Litmus test.
2. Reaction with sodium hydrogen carbonate.

Design an experiment to demonstrate hydrotropism.

A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt and why does it show such a behaviour? Give the reaction involved.

What are the disadvantages of burning fossil fuels?

Give reasons:
a. Platinum, gold and silver are used to make jewellery.
b. Sodium, potassium and lithium are stored under oil.
c. Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
d. Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
e. Lemon or tamarind juice are effective in cleaning tarnished copper vessels.

Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220V supply line one by one, what will be the ratio of electric power consumed by them?

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Describe the grafting method for the artificial propagation of plants with the help of labelled diagrams.