A = Brown B = Black C= Red D= Gold
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If the fourth ring is silver coloured what will be the change in accuracy?

A = Brown B = Black C= Red D= Gold What is the value of resistance without considering variation?

What will be masses of samples b, c, and d?

A student is doing an experiment in the laboratory using sodium. Suddenly, a piece of sodium falls into liquid ammonia. (a) What changes can you observe in liquid ammonia? (b) What is the reason for the change? (c) If the solution is kept for a long time it is changed into bronze colour. Why?

A,B,C and D are four gases. 2 mole A react with 3 mole B to form 2 mole C and mole D. in this reversible reaction, forward reaction is exothermic. Write the chemical equation for the reaction and answer thefollowing questions. a) If the system is at eqilibrium, what will be the effect of increase in pressure on the system? b) What is the effect of change in temperature?

a) What are the changes that can be observed with the iron rod and the color of copper sulphate solution if iron rod is dipped in copper sulphate solution? b) Write the equation of the oxidation and reduction reactions. c) What will be the change if silver rod is used instead of iron rod? What is the reason?

A reaction A + B rarr C + D + q is formed to have a positive entropy change. The reaction will be.

A carbon resistor is marked in coloured bands of red, black, orange and silver. What is the resistance and tolerence value of the resistor?

Sodium reacts with water. a. Identify the gas evolved in the reaction. b. If two drops of phenolphthalein is added to the water, what will be colour change of the resultant solution? Explain the reason.