Subject :NSO Class : Class 6
Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 7
Match column I with column II and select the correct option from the codes given below.
| Column I (Salts) | Column II (Uses) |
| P. Baking soda | 1.In making fire-works |
| Q. Nitre | 2.As a fungicide |
| R. Blue vitriol | 3.In purification of water |
| S. Phitkari | 4.In fire extinguishers |
A P-3; Q-2; R-4; S-1
B P-4; Q-3; R-1; S-2
C P-4; Q-1; R-2; S-3
D P-2; Q-1; R-4; S-3
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 2
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Subject :NSO Class : Class 3
stands for 40 people, 6 
will stand for _____ people