STD 6 MATHS CH 11.4 SVADHYAY

6, 4, 5, 11, 39, ?

Find the fourth proportional to 3.6,6.9 and 11.4 A.20.3 B.18.9 C.19.6 D.21.9

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11.2 L of CH_(4) and 22.4 L of C_(2)H_(6) at STP are mixed. Then choose correct statement/ statements

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Which of the following is a stronger acid in each of the following pairs ? (a) CH_2 (Cl ) COOH,CH_2 (F ) COOH " " (b ) CH_2 (Cl) CH_2 CH_2 COOH ,CH_3 COOH , CH_3CH(Cl) CH_2 COOH (c ) CH_3 COOH ,C_6 H_5 CH_2 COOH " " (d ) m-NO_2 C_6 H_4 COOH ,p -NO_2 C_6 H_4 COOH (e ) p-NO_2 C_6 H_4 COOH ,C_6 H_5 COOH " " ( f ) m- OHC_6 H_4 COOH,p- OHC _6 H_4 COOH

Which of the following is incorrect about a sample of 11.2L CH_4 gas at STP :

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Simplify: 1'1/11 + 2'2/11 + 3'3/11 + 4/11 + 5/11 + 6/11