**Question 1. A solution turns red litmus blue, its pH is likely to be**

(a) 1

(b) 4

(c) 5

(d) 10

(a) 1

(b) 4

(c) 5

(d) 10

**Answer :**(d) 10

(a) 1

(b) 4

(c) 5

(d) 10

2PbO(s) + C(s) → 2Pb(s) + CO2(g)

(a) Lead is getting reduced.

(b) Carbon dioxide is getting oxidised.

(c) Carbon is getting oxidised.

(d) Lead oxide is getting reduced.

(i) (a) and (b)

(ii) (a) and (c)

(iii) (a), (b) and (c)

(iv) all

Thing To Do

The atmosphere have following layers :

(a) Troposphere.

(b)Stratosphere

(c) Mesosphere

(d) Thermosphere

(e) Exosphere

1. | 382, 4972, 18, 59785, 750 | Ans. 59785 is the greatest and 18 is the smallest. |

2. | 1473, 89423, 100, 5000, 310. | Ans. 89423 is the greatest and 100 is the smallest. |

3. | 1834, 75284, 111, 2333, 450 | Ans.75284 is the greatest and 111 is the smallest. |

4. | 2853, 7691, 9999, 12002, 124 | Ans. 12002 is the greatest and 124 is the smallest. |

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